CN112455039A - Renewable PEF heat shrinkage film - Google Patents

Renewable PEF heat shrinkage film Download PDF

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CN112455039A
CN112455039A CN202011242734.2A CN202011242734A CN112455039A CN 112455039 A CN112455039 A CN 112455039A CN 202011242734 A CN202011242734 A CN 202011242734A CN 112455039 A CN112455039 A CN 112455039A
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outer layer
layer
heat shrinkable
inner layer
thickness
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刘秋贵
刘焜
刘新
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Shantou Mingjia Heat Shrinkable Film Co ltd
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Shantou Mingjia Heat Shrinkable Film Co ltd
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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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/027—Thermal properties
    • 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
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • 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
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • 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
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable

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Abstract

The invention provides a renewable PEF heat shrinkable film which comprises an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, and the heat shrinkable film is characterized in that the inner layer and the outer layer are both made of polyethylene materials, and the difference between the melt indexes of the inner layer and the outer layer is 0.15-1.3 g/10 min. According to the technical scheme, Linear Low Density Polyethylene (LLDPE), Low Density Polyethylene (LDPE) and High Density Polyethylene (HDPE) are used as raw materials of the heat shrinkable film, and no other chemical auxiliary agent is added, so that the PEF heat shrinkable film can be completely recycled.

Description

Renewable PEF heat shrinkage film
Technical Field
The invention relates to the technical field of plastic film packaging, in particular to a renewable PEF heat shrinkable film.
Background
A heat shrinkable film is a thermoplastic film that is oriented by stretching in the machine direction and the transverse direction of the film during production and shrinks by heat during use. The heat shrinkability of films was used as early as 1936, and originally rubber films were primarily used for shrink-wrapping perishable foods. Nowadays, the heat-shrinkable technology has been developed to almost use plastic shrink films to package various commodities, and has wide applications in the fields of food and beverage, electronic products, automobile products, daily chemicals, stationery, medicine, and the like. The thermal shrinkage film is usually processed by a double-bubble method, the physical principle of the double-bubble process is that when a high polymer is in a high elastic state, the high polymer is stretched and oriented, then the high polymer is quenched to be below the glass transition temperature, the molecular orientation is frozen, when an object is heated in the packaging process, the molecules are sent out due to the stress generated by the thermal motion of the molecules, and the molecules are recovered to the original state to generate shrinkage.
Along with the improvement of the requirements of consumers on health, environmental protection, green and the like, the heat shrinkable film is developed towards the direction of non-toxicity, degradability, convenient recycling and improvement of recycling rate. Polyethylene (PE) is one of the base materials commonly used as a heat-shrinkable film, and linear low-density polyethylene (LLDPE) is spotlighted by packaging workers because of its properties of high impact strength and tear strength, high stretch resilience, good thermal stability, etc.
Although polyethylene is adopted as a material to produce the heat shrinkable film at present, in the actual production, other chemical additives are required to be added into the polyethylene to ensure the mechanical properties of the film blowing molding and the heat shrinkable film, and after the chemical additives are mixed into the polyethylene, the molecular change of the polyethylene cannot be completely recycled.
Disclosure of Invention
The invention mainly aims to provide a renewable PEF heat shrinkable film, and aims to solve the problem of low recycling rate of the conventional heat shrinkable film after use.
In order to achieve the purpose, the invention provides a renewable PEF heat shrinkable film which comprises an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer and the outer layer are both made of polyethylene materials, and the difference between the melt indexes of the inner layer and the outer layer is 0.15-1.3 g/10 min.
Preferably, the difference between the melt indexes of the polyethylene of the inner layer and the polyethylene of the outer layer is 0.20-0.75 g/10 min.
Preferably, the thickness of the PEF heat shrinkable film is 10-30 um.
Preferably, the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Preferably, the inner layer comprises LLDPE and the outer layer (1) and the outer layer (2) are HDPE.
Preferably, the inner layer further comprises LDPE, and the composition of the inner layer is, in mass percent: 60-80% of LLDPE and 20-40% of LDPE.
Preferably, the inner layer is HDPE and the outer layer (1) and the outer layer (2) comprise LLDPE.
Preferably, the outer layer (1) and the outer layer (2) further comprise LDPE.
Preferably, the LLDPE has a melt index of 0.7-2 g/10min and a density of 0.90-0.92 g/cm3。
Preferably, the LLDPE has the density of 0.912-0.913 g/cm3。
Preferably, the HDPE has a melt index of 0.35-0.7 g/10min and a density of 0.954-0.961 g/cm 3.
Preferably, the LDPE has a melt index of 0.25-2 g/10min and a density of 0.919-0.925 g/cm 3.
According to the technical scheme, Linear Low Density Polyethylene (LLDPE), Low Density Polyethylene (LDPE) and High Density Polyethylene (HDPE) are used as raw materials of the heat shrinkable film, and no other chemical auxiliary agent is added, so that the PEF heat shrinkable film can be completely recycled. And the film blowing molding of the PEF heat shrinkable film is realized by controlling the melt index difference between different film layers. The PEF heat shrinkable film produced by the invention does not need to mix high-density polyethylene and low-density polyethylene between the same film layers, can also ensure the mechanical properties such as tear resistance, tensile strength and the like of the PEF film, can completely recycle resources by peeling the film layers after use, and further improves the utilization rate of reclaimed materials.
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FIG. 1 is a schematic structural view of a PEF heat shrinkable film in an example.
Detailed Description
The technical solutions in the embodiments of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The polyethylene used as the raw material of the present invention was obtained from Exxon Mobil chemical industry Co., Ltd.
As shown in fig. 1, the PEF heat shrinkable film has a three-layer structure, wherein 1 and 2 are outer layers, and 3 is an inner layer, and for convenience of description in the specification, the two outer layers of the PEF heat shrinkable film are respectively described as an outer layer (1) and an outer layer (2), the outer layer (1) and the outer layer (2) have the same thickness, and the raw material composition is the same.
Example 1
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is LLDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.90g/cm3(ii) a The outer layer (1) and the outer layer (2) are made of HDPE, the melt index of the HDPE is 0.35g/10min, and the density of the HDPE is 0.954-0.961 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 10-20 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Example 2
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a centerThe inner layer is LLDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.912g/cm3(ii) a The outer layer (1) and the outer layer (2) are made of HDPE, the melt index of the HDPE is 0.35g/10min, and the density of the HDPE is 0.954-0.961 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 10-20 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Example 3
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is LLDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.913g/cm3(ii) a The outer layer (1) and the outer layer (2) are made of HDPE, the melt index of the HDPE is 0.35g/10min, and the density of the HDPE is 0.954-0.961 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 10-20 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Example 4
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is LLDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.92g/cm3(ii) a The outer layer (1) and the outer layer (2) are made of HDPE, the melt index of the HDPE is 0.35g/10min, and the density of the HDPE is 0.954-0.961 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 10-20 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
The performance of the commercially available POF heat shrinkable films and the PEF heat shrinkable films of examples 1-4 was tested using the commercially available POF heat shrinkable films as comparative examples, and the test results are shown in Table 1.
TABLE 1 mechanical property test results of PEF heat shrinkable films prepared in examples 1-4
Figure BDA0002768926540000041
As can be seen from Table 1, the tensile yield strength, tensile break strength, elongation at break and weight of falling mark impact damage of the PEF heat shrinkable films in the examples 1 to 4 are slightly higher than those of the conventional POF heat shrinkable films in the market at present, which indicates that the mechanical properties of the PEF heat shrinkable films in the examples 1 to 4 completely meet the market requirements.
Example 5
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is 55% of LLDPE and 45% of LDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.90g/cm3(ii) a The LDPE has a melt index of 0.25-2 g/10min and a density of 0.919-0.925 g/cm3. The outer layer (1) and the outer layer (2) are made of HDPE, the melt index of the HDPE is 0.35g/10min, and the density of the HDPE is 0.954-0.961 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 15-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Example 6
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is 60% of LLDPE and 40% of LDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.90g/cm 3; the LDPE has a melt index of 0.25-2 g/10min and a density of 0.919-0.925 g/cm3. The outer layer (1) and the outer layer (2) are made of HDPE, the melt index of the HDPE is 0.35g/10min, and the density of the HDPE is 0.954-0.961 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 15-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Example 7
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is 70% of LLDPE and 30% of LDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.90g/cm3(ii) a The LDPE has a melt index of 0.25 to 2g/10min,the density is 0.919-0.925 g/cm3. The outer layer (1) and the outer layer (2) are made of HDPE, the melt index of the HDPE is 0.35g/10min, and the density of the HDPE is 0.954-0.961 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 15-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Example 8
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is 80% of LLDPE and 20% of LDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.90g/cm3(ii) a The LDPE has a melt index of 0.25-2 g/10min and a density of 0.919-0.925 g/cm3. The outer layer (1) and the outer layer (2) are made of HDPE, the melt index of the HDPE is 0.35g/10min, and the density of the HDPE is 0.954-0.961 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 15-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Example 9
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is 85% of LLDPE and 15% of LDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.90g/cm3(ii) a The LDPE has a melt index of 0.25-2 g/10min and a density of 0.919-0.925 g/cm3. The outer layer (1) and the outer layer (2) are made of HDPE, the melt index of the HDPE is 0.35g/10min, and the density of the HDPE is 0.954-0.961 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 15-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
The PEF heat shrinkable films of examples 5-9 were subjected to performance tests, and the test results are shown in Table 2.
Table 2 mechanical property test results of the PEF heat shrinkable films prepared in examples 5 to 9
Figure BDA0002768926540000061
As is clear from table 2, in examples 5 and 9, when the amount of LLDPE contained in the inner layer of the PEF heat shrinkable film was too large or too small, the mechanical properties of the corresponding PEF heat shrinkable film products were relatively lowered. The data in the table 1 show that, in the embodiments 6 to 8, when the inner layer of the PEF heat shrinkable film simultaneously contains two polyolefins, namely LLDPE and LDPE, the mechanical properties of the PEF heat shrinkable film are not changed greatly, and the product has good stability.
Example 10
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is HDPE, the melt index of the HDPE is 0.35g/10min, and the density is 0.954-0.961 g/cm3(ii) a The outer layer (1) and the outer layer (2) are LLDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.90g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 10-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Example 11
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is HDPE, the melt index of the HDPE is 0.35/10min, and the density is 0.954-0.961 g/cm3. The outer layer (1) and the outer layer (2) are LLDPE, the melt index of the LLDPE is 1-2 g/10min, and the density is 0.912-0.913 g/cm3；
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 10-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.8-2: 1.
Example 12
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is HDPE, the melt index of the HDPE is 0.45/10min, and the density is 0.954-0.961 g/cm3. The outer layer (1) and the outer layer (2) are LLDPE, the melt index of the LLDPE is 1-2 g/10min,the density is 0.912-0.913 g/cm3；
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 10-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.8-2: 1.
Example 13
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is HDPE, the melt index of the HDPE is 0.6g/10min, and the density is 0.954-0.961 g/cm3. The outer layer (1) and the outer layer (2) are LLDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.912-0.913 g/cm3；
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 10-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.8-2: 1.
Example 14
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is HDPE, the melt index of the HDPE is 0.7g/10min, and the density is 0.954-0.961 g/cm3. The outer layer (1) and the outer layer (2) are LLDPE, the melt index of the LLDPE is 0.7-1 g/10min, and the density is 0.912-0.913 g/cm3；
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 10-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.8-2: 1.
Performance tests were conducted on the PEF heat shrinkable films of examples 10-14, and the test results are shown in Table 3.
TABLE 3 mechanical property test results of PEF heat shrinkable films prepared in examples 10 to 14
Figure BDA0002768926540000081
Combining the test results of example 1, the performance of the PEF heat shrinkable film obtained in example 10 is significantly reduced after the inner and outer layers of example 10 are interchanged with that of example 1. By selecting HDPE with a higher melt flow rate, the mechanical properties of the PEF heat shrinkable films obtained in examples 11-14 reach an average level, and the products show good properties.
Example 15
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is HDPE, the melt index of the HDPE is 0.35g/10min, and the density is 0.954-0.961 g/cm3. The outer layer (1) and the outer layer (2) are 60% of LLDPE and 40% of LDPE, wherein the LLDPE has a melt index of 0.7-1 g/10min and a density of 0.90g/cm3(ii) a The LDPE has a melt index of 0.25-2 g/10min and a density of 0.919-0.925 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 15-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
Example 16
A renewable PEF heat shrinkable film comprises 3 layers of an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, the inner layer is HDPE, the melt index of the HDPE is 0.7g/10min, and the density is 0.954-0.961 g/cm3. The outer layer (1) and the outer layer (2) are 60% of LLDPE and 40% of LDPE, wherein the LLDPE has a melt index of 0.7-1 g/10min and a density of 0.912g/cm3(ii) a The LDPE has a melt index of 0.25-2 g/10min and a density of 0.919-0.925 g/cm3。
The thickness of the film layer of the PEF heat shrinkable film in the embodiment is 15-30 um, wherein the thickness of the outer layer (1): thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
The PEF heat shrinkable films of examples 15 and 16 were subjected to performance tests, and the test results are shown in Table 4.
TABLE 4 mechanical property test results of PEF heat shrinkable films prepared in examples 15 and 16
Figure BDA0002768926540000091
Combining the test results of example 6, the performance of the PEF heat shrinkable film obtained in example 15 is significantly reduced after the inner and outer layers of example 15 are interchanged with that of example 6. By selecting HDPE with a higher melt flow rate, the mechanical properties of the PEF heat shrink film obtained in example 16 can reach an average level, and the product quality is good.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.

Claims (12)

1. The renewable PEF heat shrinkable film comprises an inner layer, an outer layer (1) and an outer layer (2), wherein the outer layer (1) and the outer layer (2) are symmetrically distributed by taking the inner layer as a center, and the renewable PEF heat shrinkable film is characterized in that the inner layer and the outer layer are both made of polyethylene materials, and the difference between the melt indexes of the inner layer and the outer layer is 0.15-1.3 g/10 min.
2. The renewable PEF heat shrink film of claim 1 wherein the difference in melt index of the polyethylene between the inner layer and the outer layer is 0.20 to 0.75g/10 min.
3. The renewable PEF heat shrinkable film of claim 1 or claim 2, wherein the thickness of the film layer of the PEF heat shrinkable film is 10-30 um.
4. The renewable PEF heat shrink film of claim 3 wherein the thickness of the outer layer (1) is: thickness of the inner layer: the thickness of the outer layer (2) is 1: 1.5-2.5: 1.
5. The renewable PEF heat shrink film of claim 1 wherein said inner layer comprises LLDPE and said outer layer (1) and said outer layer (2) are HDPE.
6. The renewable PEF heat shrink film of claim 5 wherein said inner layer further comprises LDPE and has a composition, in weight percent, of: 60-80% of LLDPE and 20-40% of LDPE.
7. The renewable PEF heat shrink film of claim 1 wherein the inner layer is HDPE and the outer layer (1) and the outer layer (2) comprise LLDPE.
8. The renewable PEF heat shrink film of claim 7 wherein said outer layer (1) and said outer layer (2) further comprise LDPE.
9. The renewable PEF heat shrink film of any one of claims 5 to 8, wherein the LLDPE has a melt index of 0.7 to 2g/10min and a density of 0.90 to 0.92g/cm3。
10. The renewable PEF heat shrink film of claim 9 wherein the LLDPE has a density of 0.912 to 0.913g/cm3。
11. The renewable PEF heat shrink film of any one of claims 5 to 8, wherein the HDPE has a melt index of 0.35 to 0.7g/10min and a density of 0.954 to 0.961g/cm3。
12. The renewable PEF heat shrink film of any one of claims 5 to 8, wherein the LDPE has a melt index of 0.25 to 2g/10min and a density of 0.919 to 0.925g/cm3。
CN202011242734.2A 2020-11-10 2020-11-10 Renewable PEF heat shrinkage film Pending CN112455039A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03189148A (en) * 1989-12-19 1991-08-19 Sekisui Chem Co Ltd Heat-shrinkable laminated film
CN104802482A (en) * 2015-04-10 2015-07-29 中国科学院长春应用化学研究所 Three-layer co-extruded PP (polypropylene)/PE (polyethylene)/PP upward-blown film and preparation method thereof
CN105058938A (en) * 2015-06-05 2015-11-18 无锡市方成彩印包装有限公司 Thermal shrinkage packaging film and production method thereof
CN109789681A (en) * 2016-07-08 2019-05-21 康斯坦蒂亚皮尔克有限责任两合公司 Recuperability polyethylene film

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03189148A (en) * 1989-12-19 1991-08-19 Sekisui Chem Co Ltd Heat-shrinkable laminated film
CN104802482A (en) * 2015-04-10 2015-07-29 中国科学院长春应用化学研究所 Three-layer co-extruded PP (polypropylene)/PE (polyethylene)/PP upward-blown film and preparation method thereof
CN105058938A (en) * 2015-06-05 2015-11-18 无锡市方成彩印包装有限公司 Thermal shrinkage packaging film and production method thereof
CN109789681A (en) * 2016-07-08 2019-05-21 康斯坦蒂亚皮尔克有限责任两合公司 Recuperability polyethylene film
US20190344551A1 (en) * 2016-07-08 2019-11-14 Constantia Pirk Gmbh & Co. Kg Recyclable Polyethylene Film

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