CN112389863B - PET bottle and normal-temperature storage method of milk or dairy products - Google Patents
PET bottle and normal-temperature storage method of milk or dairy products Download PDFInfo
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- CN112389863B CN112389863B CN201910758007.2A CN201910758007A CN112389863B CN 112389863 B CN112389863 B CN 112389863B CN 201910758007 A CN201910758007 A CN 201910758007A CN 112389863 B CN112389863 B CN 112389863B
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- 238000003860 storage Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 235000013365 dairy product Nutrition 0.000 title description 6
- 239000000463 material Substances 0.000 claims abstract description 115
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- 239000002356 single layer Substances 0.000 claims abstract description 36
- 230000000903 blocking effect Effects 0.000 claims abstract description 33
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 40
- 239000004408 titanium dioxide Substances 0.000 claims description 20
- 239000006229 carbon black Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
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- 238000002834 transmittance Methods 0.000 description 30
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- AUNGANRZJHBGPY-SCRDCRAPSA-N Riboflavin Chemical compound OC[C@@H](O)[C@@H](O)[C@@H](O)CN1C=2C=C(C)C(C)=CC=2N=C2C1=NC(=O)NC2=O AUNGANRZJHBGPY-SCRDCRAPSA-N 0.000 description 2
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- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/244—All polymers belonging to those covered by group B32B27/36
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/41—Opaque
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
- B32B2439/60—Bottles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a PET bottle and a normal-temperature storage method of milk or milk products. It includes bottle end, body and bottleneck this PET bottle, wherein: the bottle body consists of an outer layer, an intermediate layer and an inner layer; the intermediate layer contains a first light blocking material; the inner layer and the outer layer respectively contain a second light-blocking material; the bottle bottom and the bottle mouth are of a single-layer structure made of a PET material containing a second light-blocking material, or partial areas of the bottle bottom and the bottle mouth are of a single-layer structure made of a PET material containing the second light-blocking material and other areas are of the same structure as the bottle body, or the bottle bottom and the bottle mouth are of the same structure as the bottle body. The invention also provides a normal-temperature storage method of milk or milk products, which takes the PET bottle as a storage container. The PET bottle has good light-blocking effect, can completely block all-wave-band illumination, and provides protection for packaged milk or milk products.
Description
Technical Field
The invention relates to a PET bottle and a normal-temperature storage method of milk or dairy products, belonging to the technical field of dairy product packaging.
Background
The factors influencing the oxidation of fat in milk mainly include oxygen, illumination, storage temperature and the like, the photooxidation is the main cause of the oxidation of the milk fat in the milk, and the milk can absorb part of visible light or ultraviolet light to ensure that the milk fat generates the photooxidation. The photo-oxidation has promotion effect on dairy product rancidity, the rancidity degree is related to light wavelength, illumination intensity and duration, and dissolved oxygen amount of the product, and riboflavin can be used as a main photosensitizer in milk to promote the photo-oxidation process of milk fat.
The larger the absorption capacity of the photosensitizer to light, the more rapidly the photosensitizer degrades, the more the packaging material can influence the flavor of the product by influencing oxygen and light in the product, the photosensitive components playing an important role in the oxidation process of the oil have different adsorption characteristics in different visible light illumination wave bands, the larger the absorption peak of the photosensitive components is, the more singlet oxygen generated by the action of the photosensitive components is, and the more serious the illumination oxidation degree is.
In conclusion, the flavor change of the milk is closely related to the photosensitive substance in the milk, so that the flavor change of the milk can be controlled by controlling the light transmittance in the packaging material.
The tetra pak packaging material is a packaging form for storing milk or milk products at normal temperature, which is widely applied in the world, and has excellent light-blocking performance besides sterility, and can completely block all bands of light. However, tetra pak packaging also has drawbacks such as insufficient mechanical strength, a single shape, etc.
With the development of the beverage industry, PET packaging and aseptic filling equipment has come into operation, and is already mature to be used in the milk-containing and other beverage industries. The PET bottle has high mechanical strength, changeable shape, repeated opening and closing and convenient carrying. However, the PET bottle without the additive is colorless and transparent, cannot effectively block light, and cannot be directly applied to pure milk with long shelf life at normal temperature.
Attempts have been made to minimize light transmittance by modifying the way PET bottles are used, including the use of Ultraviolet (UV) light absorbers, the addition of various colored oils to PET packaging bottles, and the direct addition of light blocking color concentrates to PET bottles. The addition of UV absorbers to clear PET bottles provides excellent protection in the ultraviolet range below 380 nm but produces little benefit in the visible range of 400-700 nm. The color oil is added into the PET bottle, and the addition amount is not more than 2% due to the process limitation of the color oil, so that the light-blocking effect of the PET bottle cannot meet the actual requirement. The way of directly adding the light-blocking color master in the transparent PET bottle (single-layer mixed material) provides better opacity and protection of the content thereof, but still needs to be improved in the visible light range of 550-700 nm, and in addition, the addition amount of the light-blocking color master is high in order to obtain better opacity, so that the processing process window of the bottle is easily narrowed, the mechanical and physical properties are insufficient, and the bottle is easily damaged to lose the barrier property.
In addition, PET individual layer bottle needs the light blocking material of higher content in order to reach certain light blocking effect, and this can lead to the light blocking material to be difficult to the homodisperse, also can influence the wall thickness of body, is difficult to obtain comparatively even wall thickness, also can bring adverse effect to light blocking performance.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a PET bottle having a three-layer structure, which can control light transmittance to a low level by adding a light blocking material, and has good light blocking performance.
The invention also aims to provide a normal-temperature storage method of milk or milk products, which realizes the normal-temperature storage of the milk or the milk products by adopting the PET bottle with very low light transmittance as a storage container of the milk or the milk products.
In order to achieve the purpose, the invention provides a PET bottle, which comprises a bottle bottom, a bottle body and a bottle mouth, wherein:
the bottle body consists of an outer layer, a middle layer and an inner layer; the intermediate layer contains a first light-blocking material, and the first light-blocking material is a black light-blocking material; the inner layer and the outer layer respectively contain a second light-blocking material;
the bottle bottom is of a single-layer structure made of a PET material containing a second light-blocking material, or a partial area of the bottle bottom is of a single-layer structure made of a PET material containing the second light-blocking material and other areas are of the same structure as the bottle body, or the bottle bottom is of the same structure as the bottle body;
the bottle mouth is of a single-layer structure made of a PET material containing a second light-blocking material, or a part of area of the bottle mouth is of a single-layer structure made of the PET material containing the second light-blocking material and other areas are of the same structure as the bottle body, or the bottle mouth is of the same structure as the bottle body;
based on the total mass of the PET bottle, the total content of the first light-blocking material is 0.02-5.25%, and the total content of the second light-blocking material is 0.21-12.15%.
The PET bottle is generally divided into a bottle mouth, a bottle body and a bottle bottom, wherein the bottle mouth is a part above a support ring, and the bottle bottom is a part below a bottom joint line. The "same structure as the body" means that the body has a three-layer structure composed of an outer layer, an intermediate layer and an inner layer, which is the same as the body, and the intermediate layer contains a first light-blocking material and the inner and outer layers contain second light-blocking materials, respectively. When partial areas of the bottle bottom and the bottle opening are of a single-layer structure made of the PET material containing the second light-blocking material and other areas are of the same structure (namely, a three-layer structure part) as the bottle body, the thicknesses of the positions where the single-layer structure part and the three-layer structure part are connected are the same, and the proportion of the single-layer structure part and the three-layer structure part can be set as required.
In the PET bottle, the inner layer is a layer which can be contacted with the packaged contents in the PET bottle, the outer layer is a layer which is contacted with the environment outside the PET bottle, the middle layer is positioned between the outer layer and the inner layer, the black light-blocking material in the middle layer plays a main light-blocking role, the second light-blocking material in the inner layer and the outer layer plays an auxiliary light-blocking role, and the overall light-blocking performance of the PET bottle can be regulated and controlled through the matching of the inner layer and the inner layer. The thicknesses of the inner layer and the outer layer of the PET bottle, the types and the contents of the light-blocking materials, the occupied gram weight and the like can be completely the same, and different conditions can be selected according to requirements. When the wall of the PET bottle with the three-layer structure is cut open, the three-layer structure can be seen clearly, wherein the middle layer containing the black light-blocking material is positioned in the middle, and the inner layer and the outer layer are respectively arranged on two sides of the middle layer.
When the PET bottle has a two-layer structure, for example, the inner layer is added with a black light-blocking material to provide a main light-blocking performance, and the outer layer is added with a second light-blocking material such as titanium dioxide to provide an auxiliary light-blocking performance, due to the addition of the black light-blocking material, the color of the inner layer is very dark, almost dark gray, or even black, which is hardly accepted by consumers. According to the PET bottle, the three-layer structure is adopted, the middle layer containing the black light-blocking material is arranged between the outer layer and the inner layer containing the second light-blocking material such as titanium dioxide, the middle layer with a darker color can be respectively covered from the outside and the inside of the PET bottle, so that the appearance of the PET bottle is not obviously different from that of a common white packaging bottle (such as a PET single-layer bottle added with light-blocking color master), and the PET bottle conforms to the impression of a consumer on the packaging of milk or dairy products.
According to a specific embodiment of the present invention, in the PET bottle of the present invention, the amounts of the first light blocking material and the second light blocking material are preferably controlled within the following ranges, respectively, in mass percent: from the perspective of the middle layer, the inner layer and the outer layer, the content of the first light-blocking material in the middle layer is 0.2% -17.5% by mass of the middle layer; the content of the second light-blocking material in the inner layer and the outer layer is 0.3-13.5% by mass respectively.
Compared with the existing PET bottle, the PET bottle disclosed by the invention can reduce the usage amount of the second light-blocking material such as titanium dioxide and the like by adopting the black light-blocking material and the three-layer structure, so that the usage amount of additives such as the light-blocking material and the like is reduced on the whole, the viscosity of the bottle body is improved, and the strength performance is improved.
According to a specific embodiment of the present invention, the thickness of the PET bottle of the present invention may be 0.1mm to 1.0mm; preferably 0.25-0.5mm. Because the PET bottle adopts a three-layer structure, black light-blocking materials such as carbon black and the like are arranged in the middle of the bottle body, the wall thickness value of the obtained bottle body is concentrated, the thickness of the bottle wall is uniform, and the thickness of the PET bottle can be controlled within the range of 0.3-0.45mm, for example.
According to a particular embodiment of the present invention, preferably, the present invention also provides the following PET bottle: in the PET bottle, based on the total mass of the PET bottle, the content of the first light-blocking material is 0.02-1.05%, and the content of the second light-blocking material is 0.21-6.75%. The light transmittance of the PET bottle can reach the degree of less than or equal to 0.4 percent, has more excellent light resistance, and can better meet the normal-temperature storage and selling requirements of milk or milk products and the like. According to a specific embodiment of the present invention, more preferably, in the above PET bottle, the content of the first light blocking material in the intermediate layer is 0.2% to 3.5% by mass of the intermediate layer; the content of the second light-blocking material in the inner layer and the outer layer is 0.3-7.5% by mass of the inner layer and the outer layer respectively.
According to a particular embodiment of the present invention, preferably, the present invention also provides the following PET bottle: in the PET bottle, based on the total mass of the PET bottle, the content of the first light-blocking material is 0.04-0.42%, and the content of the second light-blocking material is 1.26-6.75%. The light transmittance of the PET bottle can reach the degree of less than or equal to 0.1 percent, has more excellent light resistance, and can better meet the normal-temperature storage requirement of pure milk. In addition, according to investigation, a consumer has a great attention to the colors of the inside and the outside of the bottle body, the colors generally tend to be white and milky colors which are common in the current market, and the deep color is difficult to accept, and after the black light-blocking material is added, the color of the bottle body is deepened, and the whiteness is reduced, so that the consumption experience of the consumer is seriously influenced. According to a specific embodiment of the present invention, more preferably, in the PET bottle described above, the content of the first light blocking material in the intermediate layer is 0.4% to 1.4% by mass of the intermediate layer; the content of the second light-blocking material in the inner layer and the outer layer is respectively 1.8-7.5% by mass of the inner layer and the outer layer.
According to a particular embodiment of the present invention, preferably, the present invention also provides the following PET bottle: based on the total mass of the PET bottle, the content of the first light-blocking material is 0.04-0.42%, and the content of the second light-blocking material is 2.52-6.75%. By controlling the contents of the first light-blocking material and the second light-blocking material within the above ranges, the PET bottle can achieve the same appearance color effect as a PET single-layer bottle only added with 10 mass percent of light-blocking color master under the condition of ensuring that the light transmittance is less than or equal to 0.1 percent, and the brightness (L value) of the PET single-layer bottle is equivalent to that of the PET single-layer bottle. According to a specific embodiment of the present invention, more preferably, in the PET bottle, the content of the first light blocking material in the intermediate layer is 0.4% to 1.4% by mass of the intermediate layer; the content of the second light-blocking material in the inner layer and the outer layer is 3.6-7.5% by mass of the inner layer and the outer layer respectively.
According to a particular embodiment of the present invention, preferably, the present invention also provides the following PET bottle: based on the total mass of the PET bottle, the content of the first light-blocking material is 0.06% -0.42%, and the content of the second light-blocking material is 0.63% -1.35%. The cost of the existing PET bottle is higher due to the higher price of the light-blocking color master, and the light-blocking material of the PET bottle is controlled within the range, so that the cost can be greatly reduced by about 45-50 percent (relative to a PET single-layer bottle) under the condition of ensuring that the light transmittance is less than or equal to 0.1 percent. According to a specific embodiment of the present invention, more preferably, in the PET bottle described above, the content of the first light blocking material in the intermediate layer is 0.6% to 1.4% by mass of the intermediate layer; the content of the second light-blocking material in the inner layer and the outer layer is 0.9-1.5% by mass of the inner layer and the outer layer respectively.
The light-blocking material (comprising the first light-blocking material and the second light-blocking material) is a material capable of blocking light in absorption, reflection, scattering, refraction and other modes to prevent the light from entering the PET bottle, and the black light-blocking material is black. According to a specific embodiment of the present invention, the first light-blocking material (black light-blocking material) suitable for the present invention preferably comprises one or a combination (preferably added in the form of powder) of carbon black, activated carbon, graphite, pigment black, etc., and the black light-blocking material can be added in the form of black master, wherein the content of the black light-blocking material can be controlled to be 10% -50%, preferably 20% -35%; in addition to the black light-blocking material, the black master batch may also contain other suitable ingredients (e.g., solvents, carriers, additives, etc.). The light-blocking materials suitable for the inner layer and the outer layer of the PET bottle comprise titanium dioxide and/or titanium dioxide (preferably added in a powder form), and the like, and similarly, the titanium dioxide can also be added in a light-blocking color master batch form, wherein the content of the titanium dioxide can be controlled to be more than 50%, and is preferably 60-75%; the light-blocking color master batch can also contain other proper components, such as a solvent, a carrier and the like; black light-blocking materials such as carbon black and metal powders may be added to the inner layer and the outer layer as needed.
The PET bottle of the invention can be prepared by multilayer injection molding, multilayer injection blow molding, multilayer coextrusion blow molding and other methods. According to the specific embodiment of the present invention, the PET raw material used for the PET bottle provided by the present invention may be the same as the existing PET bottle, and the raw material may contain other suitable components such as other additives besides the PET and the light blocking material.
The invention also provides a normal-temperature storage method of milk or milk products, which takes the PET bottle provided by the invention as a storage container, and the stored milk and milk products can be yoghourt, milk-containing beverage, pure milk and the like.
According to the specific embodiment of the invention, preferably, the method uses the PET bottle with the light transmission rate less than or equal to 0.1% provided by the invention as a storage container, and the milk stored by the method is pure milk.
The PET bottle provided by the invention has a good light-blocking effect, can completely block all-wave-band illumination, and provides protection for packaged milk or milk products.
Drawings
FIG. 1 is a graph showing the relationship between the titanium dioxide content and the maximum value of the light transmittance in the case where the carbon black content is 0.1%.
FIG. 2 is a graph showing the relationship between the titanium dioxide content and the maximum value of the light transmittance in the case where the carbon black content is 0.2%.
FIG. 3 shows the results of the acceptability of a product after storage at ambient temperature for a certain shelf life.
FIG. 4 is a graph of the average wall thickness distribution at various locations for the PET bottle of example 15.
FIG. 5 is a graph of the average wall thickness distribution at different locations for the PET monolayer bottle of comparative example 1.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
In the present invention, the light transmittance refers to the light transmittance for the light source of the whole band with the wavelength of 200-800 nm. The light transmittance is detected by using a Color Quest XE spectrophotometer, the light transmittance of a full-wave band light source of 200-800 nanometers is detected, and the light transmittance is based on lower data of a bottle shoulder or a bottle body, and can be detected for multiple times to obtain an average value. For the numerical value of the light transmittance, the light transmittance of the bottle is less than or equal to 0.2 percent, which means that the light transmittance of the bottle for a full-wave band light source with the wavelength of 200-800 nanometers does not exceed 0.2 percent; if the light transmittance of the bottle A is less than 0.2 percent and the light transmittance of the bottle B is less than 0.1 percent, the light-blocking effect of the bottle B is considered to be better than that of the bottle A. The light transmittance maximum is the highest light transmittance value for a light source having a wavelength in the range of 200-800 nm.
Color Quest XE is a high-performance spectrophotometer that can be used in production and laboratories to test raw materials, evaluate finished products, or develop Color analysis methods. The principle of the spectrophotometer for detecting light transmittance is to fix the object to the preform support, irradiate the object with double light paths, set the sensor by spherical mirror transmission, collect all scattered and transmitted light, and calculate the light transmittance of the object. The method can avoid that the common linear transmission setting sensor cannot sense the quantity of scattered light, so that the detection result is more accurate.
The brightness is expressed as L value, detected by a colorimeter, L value: 0-100 represents from black to white. The L value is based on the detection result of the relatively flat surface of the bottle body, and the average value can be obtained through multiple detections.
Comparative example 1
The comparative example provides a PET single-layer bottle with single-layer mixed materials, which comprises PET, light-resistant color master (the main component is titanium dioxide, and the content is 60-75%) and other auxiliary agents. The single-layer mixed PET packaging bottle is added with 10% of light-blocking color master, and the light transmittance of the single-layer mixed PET packaging bottle is less than 0.4%.
Examples
The embodiment provides a set of PET bottle, and its body and the bottle end are three layer construction, and the intermediate level adds has the carbon black, and inlayer and skin add respectively has titanium dioxide, and the subregion of bottleneck is the single layer construction and other regions for the three layer construction the same with the body by the PET material that contains the second material that blocks light. The contents of carbon black and titanium dioxide (based on the total weight of the PET bottle) and the corresponding light transmittances are shown in table 1, respectively. In the case where the carbon black content is 0.1%, the relationship between the titanium dioxide content and the maximum light transmittance is shown in fig. 1, and in the case where the carbon black content is 0.2%, the relationship between the titanium dioxide content and the maximum light transmittance is shown in fig. 2.
TABLE 1 carbon Black, titanium dioxide content and light transmittance values of PET bottles
| Example number | Carbon black content% | Titanium dioxide content | Light transmittance | |
| 1 | 0.1 | 0 | ≤0.8％ | |
| 2 | 0.1 | 0.28 | ≤0.4％ | |
| 3 | 0.1 | 0.56 | ≤0.2％ | |
| 4 | 0.1 | 0.84 | ≤0.1％ | |
| 5 | 0.1 | 1.12 | ≤0.03％ | |
| 6 | 0.1 | 2.24 | ≤0.02％ | |
| 7 | 0.1 | 3.36 | ≤0.02％ | |
| 8 | 0.1 | 4.48 | ≤0.02％ | |
| 9 | 0.2 | 0 | ≤0.6％ | |
| 10 | 0.2 | 0.28 | ≤0.2％ | |
| 11 | 0.2 | 0.56 | ≤0.1％ | |
| 12 | 0.2 | 1.12 | ≤0.02％ | |
| 13 | 0.2 | 2.24 | ≤0.02％ | |
| 14 | 0.2 | 3.36 | ≤0.02％ | |
| 15 | 0.2 | 4.48 | ≤0.02％ | |
| 16 | 0.2 | 5.60 | ≤0.02％ | |
| 17 | 0.2 | 6.72 | ≤0.02％ |
1. Shelf life test
Test methods the PET bottles and tetra packs of example 15 were used to package respectively classic pure milk and consumer test experiments were conducted at regular intervals. In this test, the PET bottle was closed with a cap containing a light blocking material to ensure that light did not enter through the mouth of the bottle.
The least number of identical answers required to invite 70 consumers to make a pairwise preference comparison to conclude that a sensory difference exists is 44.
Consumer recipient acceptance was on a 5-point scale, i.e.: score 1 was completely unacceptable, score 2 was unacceptable, score 3 was unacceptable, score 4 was acceptable, and score 5 was completely acceptable.
The results of the acceptability of the product after storage at ambient temperature for a certain shelf life are shown in FIG. 3.
2. Wall thickness test
Wall thickness measurements were performed on the PET bottles of example 15 and the PET single layer bottles of comparative example 1, in the following manner: selecting 8 points with different heights from the bottom of the bottle, and respectively detecting the wall thickness values of the 8 points; 5 samples are selected, the corresponding wall thickness values are detected respectively, and then the average value is taken.
The detection results are shown in fig. 4 and fig. 5, and in tables 2 and 3, respectively, wherein fig. 4 is the average wall thickness distribution curve of the PET bottle of example 15 at different positions, and fig. 5 is the average wall thickness distribution curve of the PET single-layer bottle of comparative example 1 at different positions.
TABLE 2 wall thickness values at different positions of the PET bottle of example 15
Table 3 wall thickness values at different positions of the PET single-layer bottle of comparative example 1
From the data in tables 2 and 3, it can be seen that: the average value of the wall thickness of the PET bottle of example 15 was distributed between 0.332 and 0.412mm, and the difference between the maximum value and the minimum value was 0.080mm, and the average value of the wall thickness of the PET single-layer bottle of comparative example 1 was distributed between 0.262 and 0.443mm, and the difference between the maximum value and the minimum value was 0.181mm. It can thus be seen that: the PET bottle of embodiment 15 has a narrower wall thickness distribution range, more concentrated distribution, and more uniform wall thickness, which helps the uniform distribution of the light-blocking material, and thus, a PET bottle with better light-blocking effect is obtained. As can be seen from fig. 4 and 5: this can also be demonstrated by the fact that the wall thickness distribution curve of the PET bottle of example 15 is more gradual than that of the PET single-layer bottle of comparative example 1.
3. Drop strength test
The PET bottle of example 15 was subjected to a drop strength test, specifically in the following manner: the bottle was filled with 0.5bar of air, and then the bottle was set at a height of 1.4m at 4 ℃ and 22 ℃ respectively to allow free fall, and the breakage of the bottle was observed 10 times at each of the two temperatures.
The test results were as follows: the PET bottle of example 15 was not broken in all 20 trials and passed the relevant tests.
4. Brightness test
The brightness L values of the PET single-layer bottles of comparative example 1 and the PET bottles of examples 6 to 8 and 12 to 15 were tested in the following manner: three positions are selected at the position where the bottle body is relatively flat, the L values of the positions are respectively tested by a color difference meter, then the average value is obtained, and the specific result is shown in table 4.
Table 4 shows the luminance test results
The existing PET single-layer bottle does not contain black light-blocking materials such as carbon black and the like, and the content of titanium dioxide is very high, so that the appearance color of the PET single-layer bottle is relatively good and is very close to pure white.
As can be seen from the data in table 4: the PET bottle of example 12 contained more carbon black and less titanium dioxide, resulting in an outer layer with insufficient hiding of the color of the middle layer and a relatively low brightness L value.
The L values of the PET bottles of examples 6, 13 can reach 85 or more, although lower than the PET monolayer bottle of comparative example 1, but with little difference, as observed by naked eye: the appearance of these PET bottles was also very close to white with acceptable brightness.
The L values of the PET bottles of examples 7 to 8 and examples 14 to 15 were slightly higher than (or substantially equivalent to) the PET single layer bottle of comparative example 1, indicating that the appearance of these PET bottles was very good and comparable to that of the PET single layer bottle.
Claims (19)
1. A PET bottle comprising a bottle base, a bottle body and a bottle mouth, wherein:
the bottle body consists of an outer layer, a middle layer and an inner layer; the intermediate layer contains a first light-blocking material, and the first light-blocking material is a black light-blocking material; the inner layer and the outer layer respectively contain a second light-blocking material;
the bottle bottom is of a single-layer structure made of a PET material containing a second light-blocking material, or a partial area of the bottle bottom is of a single-layer structure made of a PET material containing the second light-blocking material and other areas are of the same structure as the bottle body, or the bottle bottom is of the same structure as the bottle body;
the bottle mouth is of a single-layer structure made of a PET material containing a second light-blocking material, or a part of area of the bottle mouth is of a single-layer structure made of the PET material containing the second light-blocking material and other areas are of the same structure as the bottle body, or the bottle mouth is of the same structure as the bottle body;
based on the total mass of the PET bottle, the total content of the first light-blocking material is 0.02-1.05%, and the total content of the second light-blocking material is 0.21-6.75%;
the content of the first light-blocking material in the middle layer is 0.2-3.5% by mass percent.
2. The PET bottle as claimed in claim 1, wherein the contents of the second light blocking material in the inner and outer layers are 0.3 to 13.5% by mass, respectively.
3. The PET bottle according to claim 1 or 2, wherein the PET bottle has a thickness of 0.1mm to 1.0mm.
4. The PET bottle according to claim 3, wherein the PET bottle has a thickness of 0.25-0.5mm.
5. The PET bottle according to claim 3, wherein the PET bottle has a thickness of 0.3-0.45mm.
6. The PET bottle according to claim 1, wherein the content of the second light blocking material in the inner layer and the outer layer is 0.3-7.5% by mass, respectively.
7. The PET bottle according to claim 1, wherein the first light blocking material is present in an amount of 0.04% to 0.42% and the second light blocking material is present in an amount of 1.26% to 6.75% based on the total mass of the PET bottle.
8. The PET bottle according to claim 7, wherein the content of the first light blocking material in the intermediate layer is 0.4-1.4% by mass.
9. The PET bottle according to claim 7 or 8, wherein the content of the second light blocking material in the inner layer and the outer layer is 1.8-7.5% by mass, respectively.
10. The PET bottle according to claim 1 or 7, wherein the first light blocking material is present in an amount of 0.04% to 0.42% and the second light blocking material is present in an amount of 2.52% to 6.75% based on the total mass of the PET bottle.
11. The PET bottle according to claim 10, wherein the content of the first light blocking material in the intermediate layer is 0.4% to 1.4% by mass.
12. The PET bottle according to claim 10 or 11, wherein the contents of the second light blocking material in the inner layer and the outer layer are 3.6 to 7.5% by mass, respectively.
13. The PET bottle according to claim 1 or 7, wherein the first light blocking material is contained in an amount of 0.06% to 0.42% and the second light blocking material is contained in an amount of 0.63% to 1.35% based on the total mass of the PET bottle.
14. The PET bottle according to claim 13, wherein the content of the first light blocking material in the intermediate layer is 0.6 to 1.4% by mass.
15. The PET bottle according to claim 13 or 14, wherein the content of the second light blocking material in the inner layer and the outer layer is 0.9 to 1.5% by mass, respectively.
16. The PET bottle of any of claims 1-15, wherein the first light blocking material comprises one or a combination of carbon black, activated carbon, graphite, pigment black.
17. The PET bottle of any one of claims 1-16, wherein the second light blocking material in the inner and outer layers comprises titanium dioxide and/or titanium dioxide.
18. A method for ambient temperature storage of milk or milk products, which comprises using the PET bottle according to any one of claims 1 to 17 as a storage container.
19. The method according to claim 18, wherein the method uses the PET bottle according to any one of claims 7 to 17 as a storage container, and the milk stored in the method is pure milk.
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| CN101360661A (en) * | 2005-11-21 | 2009-02-04 | 明治乳业株式会社 | Milk beverage/food packaged in transparent container and production method thereof |
| CN101746536A (en) * | 2008-12-15 | 2010-06-23 | 郭锡南 | Compound bottle and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4579569B2 (en) * | 2004-04-16 | 2010-11-10 | 株式会社クレハ | Multi-layer biaxially stretched blow bottle and manufacturing method thereof |
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| US6117506A (en) * | 1994-03-30 | 2000-09-12 | Silgan Plastics Corporation | Multilayer bottle with encapsulated dark layer |
| CN1302255A (en) * | 1998-05-22 | 2001-07-04 | 利乐拉瓦尔集团及财务有限公司 | Packaging meterial and packages produced from material for light sensitive product |
| CN101360661A (en) * | 2005-11-21 | 2009-02-04 | 明治乳业株式会社 | Milk beverage/food packaged in transparent container and production method thereof |
| CN101746536A (en) * | 2008-12-15 | 2010-06-23 | 郭锡南 | Compound bottle and manufacturing method thereof |
| CN206939253U (en) * | 2017-03-09 | 2018-01-30 | 珠海保税区中富聚酯啤酒瓶有限公司 | A kind of multi-layer packaging milk bottle embryo |
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