CN210617523U

CN210617523U - Transparent milk packaging film

Info

Publication number: CN210617523U
Application number: CN201920867795.4U
Authority: CN
Inventors: 黄作团; 黄家辉
Original assignee: Fujian Fuyijin Technology Co ltd
Current assignee: Fujian Fuyijin Technology Co ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-05-26
Anticipated expiration: 2029-06-11

Abstract

The utility model relates to a transparent milk packaging film, transparent milk packaging film is including the first high pressure low density polyethylene layer that stacks gradually, second metallocene polyethylene layer, third polyethylene polypropylene composite bed and the fourth ultrahigh molecular weight high density polyethylene composite bed, wherein the thickness on first high pressure low density polyethylene layer + the thickness on second metallocene polyethylene layer is 0.005-0.01mm, the thickness on third polyethylene polypropylene composite bed does first high pressure low density polyethylene layer with 2-4 times of the thickness sum on second metallocene polyethylene layer. Transparent milk packaging film can be used to the packing of food such as milk, and the consumer can directly see the outward appearance of inside food, can also the separation ultraviolet ray simultaneously, reduces oxygen and sees through packaging film oxidation food.

Description

Transparent milk packaging film

Technical Field

The utility model belongs to the technical field of PE packaging film preparation and specifically relates to a transparent milk packaging film.

Background

Most of the existing milk packaging films are black and white milk films, black and white master batches are added in the production of the material, small molecular substances in the black and white master batches can be separated out to a certain extent, and adverse effects are caused on the quality and the taste of food. Meanwhile, the light-proof performance, the oxidation resistance and the fresh-keeping effect of the packaging film are common.

Patent application CN101306743A discloses a milk packaging film, which is a composite film formed by connecting an outer film and an inner film into a whole through an adhesive layer, wherein the outer film is a polyvinylidene chloride film, the adhesive is one of a single-component polyurethane solvent and a two-component polyurethane solvent or a solvent-free adhesive, and the inner film is a black-and-white polyethylene film. The milk packing film is produced through the heat treatment of outer polyvinylidene chloride film in a heating device, the subsequent setting on the unwinding shaft of a compounding machine, the subsequent spreading with adhesive, and the compounding with inner film in a flattening, tension controlling and edge guide device. The inner film in the scheme is a black-and-white polyethylene film, and the problem of micromolecules in black-and-white master batch dissolution still exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that overcome prior art and exist not enough, provide a transparent milk packaging film, do not contain traditional black and white masterbatch, adopt safe material to make transparent film, be convenient for observe food appearance, still have fresh-keeping function simultaneously.

The specific scheme is as follows:

the transparent milk packaging film comprises a first high-pressure low-density polyethylene layer, a second metallocene polyethylene layer, a third polyethylene-polypropylene composite layer and a fourth ultrahigh molecular weight high-density polyethylene composite layer which are sequentially stacked, wherein the thickness of the first high-pressure low-density polyethylene layer plus the thickness of the second metallocene polyethylene layer is 0.005-0.01mm, and the thickness of the third polyethylene-polypropylene composite layer is 2-4 times of the sum of the thicknesses of the first high-pressure low-density polyethylene layer and the second metallocene polyethylene layer.

Further, the high-pressure low-density polyethylene in the first high-pressure low-density polyethylene layer is 2426H.

Further, the third polyethylene polypropylene composite layer is a composite layer of a mixture of linear low density polyethylene and polypropylene.

Further, the molecular weight of the ultrahigh molecular weight high density polyethylene in the fourth ultrahigh molecular weight high density polyethylene composite layer is 13-16 ten thousand, and the density is 0.945-0.950g/cm³。

Further, the fourth ultra-high molecular weight high density polyethylene composite layer further contains an antioxidant and an aromatic.

Further, the aromatic is a food-grade aromatic auxiliary agent.

Further, the thickness of the first high-pressure low-density polyethylene layer is 0.002-0.008 mm.

Further, the thickness of the second metallocene polyethylene layer is 0.005-0.008 mm.

Further, the fourth ultrahigh molecular weight high density polyethylene composite layer has a thickness of 0.003 to 0.03 mm.

Further, the thickness of the fourth ultrahigh molecular weight high density polyethylene composite layer is 0.01-0.02 mm.

Has the advantages that: transparent milk packaging film, high-pressure low density polyethylene, metallocene polyethylene constitution thin layer are adopted in proper order on the top layer, have transparent effect, conveniently observe the outward appearance of inside product. The high-pressure low-density polyethylene is preferably high-pressure polyethylene with the model number of 2426H, so that the film blowing is easy, and the crystal points are avoided.

Further, transparent milk packaging film still includes third polyethylene polypropylene composite bed, comprises linear low density polyethylene and polypropylene are compounded, blows the membrane according to conventional extrusion after mixing the two and forms the composite bed, can strengthen the mechanical strength of packaging film.

Finally, transparent milk packaging film still includes fourth ultra high molecular weight high density polyethylene composite bed, utilizes ultra high molecular weight high density polyethylene to mix with aromatic, extrudes according to the conventionality and blows the membrane and form the composite bed, and preferred food level aromatic auxiliary agent can not cause harmful effects to milk quality taste.

In a word, transparent milk packaging film can be used to the packing of food such as milk, and the consumer can directly see the outward appearance of inside food, can also the separation ultraviolet ray simultaneously, reduces oxygen and sees through packaging film oxidation food, has insurance effect. The transparent milk packaging film is prepared by adopting a conventional multilayer co-extrusion film blowing process, the forming temperature is 150-170 ℃ to ensure better crystallinity and transparency, the operation is simple, and the production and popularization are convenient.

Drawings

Fig. 1 is a schematic structural view of a transparent milk packaging film provided in embodiment 1 of the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the following examples. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.

The high pressure low density polyethylene in the examples was model number 2426H. The linear low density polyethylene has a density of 0.916-0.918g/cm³The melt index is 0.8-0.9g/10 min. The polypropylene is isotactic polypropylene, and the isotacticity is not lower than 90%. The ultra-high molecular weight high density polyethylene has a molecular weight of 13-16 ten thousand and a density of 0.945-0.950g/cm³. The antioxidant is hindered phenol type antioxidant, such as antioxidant 1010 or 1076. The aromatic is essence.

Example 1

Referring to fig. 1, the transparent milk packaging film is composed of a first high-pressure low-density polyethylene layer 1, a second metallocene polyethylene layer 2, a third polyethylene-polypropylene composite layer 3 and a fourth ultrahigh-molecular-weight high-density polyethylene composite layer 4 which are sequentially laminated from top to bottom.

Wherein the first high pressure low density polyethylene layer 1 has a thickness of 0.002mm and the second metallocene polyethylene layer 2 has a thickness of 0.005 mm. The third polyethylene polypropylene composite layer 3 is composed of a mixture of linear low density polyethylene and polypropylene, the mixture of linear low density polyethylene and polypropylene is added into an extruder, and a conventional film blowing process is adopted to form a polyethylene polypropylene composite layer with the thickness of 0.025 mm. The fourth ultra-high molecular weight high density polyethylene composite layer 4 is composed of ultra-high molecular weight high density polyethylene and essence, the mixture of the ultra-high molecular weight high density polyethylene and the essence is added into an extruder, and the ultra-high molecular weight high density polyethylene composite layer can be formed by adopting a conventional film blowing process, and the thickness is 0.003 mm.

The transparent milk packaging film can enable consumers to directly see whether the milk is yellow or not and whether the milk is caked or not, and the consumers can purchase the milk at ease. Meanwhile, the product has the function of blocking ultraviolet rays with the wavelength below 400nm, and the oxygen transmission rate is as follows: (23 ℃, 50% RH)3.71cm³/m²24h 0.1Mpa, has antioxidant and fresh-keeping effects.

Example 2

A transparent milk packaging film comprises a first high-pressure low-density polyethylene layer 1, a second metallocene polyethylene layer 2, a third polyethylene polypropylene composite layer 3 and a fourth ultrahigh molecular weight high-density polyethylene composite layer 4 which are sequentially stacked from top to bottom.

Wherein the thickness of the first high pressure low density polyethylene layer 1 is 0.008mm and the thickness of the second metallocene polyethylene layer 2 is 0.006 mm. The third polyethylene polypropylene composite layer 3 is composed of a mixture of linear low density polyethylene and polypropylene, the mixture of linear low density polyethylene and polypropylene is added into an extruder, and a conventional film blowing process is adopted to form a polyethylene polypropylene composite layer with the thickness of 0.026 mm. The fourth ultra-high molecular weight high density polyethylene composite layer 4 is composed of ultra-high molecular weight high density polyethylene and essence, the mixture of the ultra-high molecular weight high density polyethylene and the essence is added into an extruder, and the ultra-high molecular weight high density polyethylene composite layer can be formed by adopting a conventional film blowing process, and the thickness is 0.03 mm.

The transparent milk packaging film can enable consumers to directly see whether the milk is yellow or not and whether the milk is caked or not, and the consumers can purchase the milk at ease. Meanwhile, the product has the function of blocking ultraviolet rays with the wavelength of below 400nm and has oxygen transmission rateComprises the following steps: (23 ℃, 50% RH)3.25cm³/m²24h 0.1Mpa, has antioxidant and fresh-keeping effects.

Example 3

Wherein the thickness of the first high pressure low density polyethylene layer 1 is 0.004mm and the thickness of the second metallocene polyethylene layer 2 is 0.008 mm. The third polyethylene polypropylene composite layer 3 is composed of a mixture of linear low density polyethylene and polypropylene, the mixture of linear low density polyethylene and polypropylene is added into an extruder, and a conventional film blowing process is adopted to form a polyethylene polypropylene composite layer with the thickness of 0.025 mm. The fourth ultra-high molecular weight high density polyethylene composite layer 4 is composed of ultra-high molecular weight high density polyethylene and essence, the mixture of the ultra-high molecular weight high density polyethylene and the essence is added into an extruder, and the ultra-high molecular weight high density polyethylene composite layer can be formed by adopting a conventional film blowing process, and the thickness is 0.013 mm.

The transparent milk packaging film can enable consumers to directly see whether the milk is yellow or not and whether the milk is caked or not, and the consumers can purchase the milk at ease. Meanwhile, the product has the function of blocking ultraviolet rays with the wavelength below 400nm, and the oxygen transmission rate is as follows: (23 ℃, 50% RH)3.53cm³/m²24h 0.1Mpa, has antioxidant and fresh-keeping effects.

Example 4

Wherein the first high pressure low density polyethylene layer 1 has a thickness of 0.006mm and the second metallocene polyethylene layer 2 has a thickness of 0.006 mm. The third polyethylene polypropylene composite layer 3 is composed of a mixture of linear low density polyethylene and polypropylene, the mixture of linear low density polyethylene and polypropylene is added into an extruder, and a conventional film blowing process is adopted to form a polyethylene polypropylene composite layer with the thickness of 0.03 mm. The fourth ultra-high molecular weight high density polyethylene composite layer 4 is composed of ultra-high molecular weight high density polyethylene and essence, the mixture of the ultra-high molecular weight high density polyethylene and the essence is added into an extruder, and the ultra-high molecular weight high density polyethylene composite layer can be formed by adopting a conventional film blowing process, and the thickness is 0.02 mm.

The transparent milk packaging film can enable consumers to directly see whether the milk is yellow or not and whether the milk is caked or not, and the consumers can purchase the milk at ease. Meanwhile, the product has the function of blocking ultraviolet rays with the wavelength below 400nm, and the oxygen transmission rate is as follows: (23 ℃, 50% RH)3.51cm³/m²24h 0.1Mpa, has antioxidant and fresh-keeping effects.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims

1. A transparent milk packaging film is characterized in that: the transparent milk packaging film comprises a first high-pressure low-density polyethylene layer, a second metallocene polyethylene layer, a third metallocene polyethylene polypropylene composite layer and a fourth ultrahigh molecular weight high-density polyethylene composite layer which are sequentially laminated, wherein the thickness of the first high-pressure low-density polyethylene layer plus the thickness of the second metallocene polyethylene layer is 0.005-0.01mm, and the thickness of the third metallocene polyethylene polypropylene composite layer is 2-4 times of the sum of the thicknesses of the first high-pressure low-density polyethylene layer and the second metallocene polyethylene layer.

2. The transparent milk packaging film of claim 1, wherein: the model of the high-pressure low-density polyethylene in the first high-pressure low-density polyethylene layer is 2426H.

3. The transparent milk packaging film according to claim 1 or 2, wherein: the thickness of the first high-pressure low-density polyethylene layer is 0.002-0.008 mm.

4. The transparent milk packaging film according to claim 1 or 2, wherein: the thickness of the second metallocene polyethylene layer is 0.005-0.008 mm.

5. The transparent milk packaging film according to claim 1 or 2, wherein: the fourth ultrahigh molecular weight high density polyethylene composite layer has a thickness of 0.003-0.03 mm.

6. The transparent milk packaging film of claim 5, wherein: the fourth ultrahigh molecular weight high density polyethylene composite layer has a thickness of 0.01-0.02 mm.