CN109648968B - Two-way easy-to-tear film - Google Patents

Two-way easy-to-tear film Download PDF

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CN109648968B
CN109648968B CN201811551059.4A CN201811551059A CN109648968B CN 109648968 B CN109648968 B CN 109648968B CN 201811551059 A CN201811551059 A CN 201811551059A CN 109648968 B CN109648968 B CN 109648968B
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density polyethylene
weight percent
ethylene
density
tear film
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CN109648968A (en
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文斌森
魏洪媚
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Jiangmen Hualong membrane materials Co.,Ltd.
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Jiangmen Hualong Membrane Materials 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
    • B32B27/06—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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent

Abstract

The invention discloses a bidirectional easy-to-tear film which comprises three layers, namely an outer layer, a middle layer and an inner layer. The outer layer comprises high-pressure low-density polyethylene, low-pressure high-density polyethylene, linear low-density polyethylene and ethylene-acrylic acid copolymer; the middle layer comprises low density polyethylene, metallocene medium density polyethylene, ethylene-methacrylic acid copolymer, ionomer or ethylene-norbornadiene copolymer; the inner layer comprises high-pressure low-density polyethylene, metallocene low-density polyethylene, linear low-density polyethylene, ethylene-octylene copolymer and functional master batch. The bidirectional easy-to-tear film has the characteristics of good composite fastness, high transparency, bidirectional easy-to-tear alignment, good customer experience, low cost and the like.

Description

Two-way easy-to-tear film
Technical Field
The invention relates to the technical field of packaging films, in particular to a bidirectional easy-to-tear film which is formed by adopting raw materials such as low-density polyethylene, high-density polyethylene, ethylene-methacrylic acid copolymer, ionomer or ethylene-polynorbornene copolymer through co-extrusion film blowing.
Background
With the continuous improvement of living standard of people, the requirements on the performance of the plastic flexible package are not only limited to the aspects of shelf display, sealing protection of contents, convenience in carrying and the like. There is a trend towards how to open the package easily and quickly. The easy-tearing design of the food and medicine external package embodies the convenience of life, and does not need to be opened by tools. However, one of the existing easy-tearing films is easy-tearing by tearing a tearing opening or a sawtooth line; the other method is to control the easy-tearing effect by controlling the depth of the laser cutting line, and has the following problems:
1. the tearing opening or the sawtooth line is poor in tearing guide property, so that poor tearing or uneven tearing edge is often caused, and the content is scattered;
2. the laser cutting line is easy to tear, although the tearing opening is flat, if the tearing is too deep, the sealing performance of the package is poor, the quality guarantee period is influenced, and the tearing is too shallow and is not easy to tear;
3. the 2 methods all need to carry out subsequent processing on the packaging bag, the position of the tearing opening or the easy-to-tear line is fixed, and the packaging bag only has an easy-to-tear effect in a certain specific area and cannot completely meet the requirements of efficient life of people;
4. low efficiency and difficult process control.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the bidirectional easy-to-tear film, which has the effect of easy tearing into straight lines in the longitudinal and transverse directions, namely the bidirectional easy-to-tear straight lines, and also has the advantages of high composite fastness, good transparency, wide heat-sealing window, low heat-sealing temperature, suitability for high-speed packaging line production, effective improvement of production efficiency, cost reduction, good customer experience and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows: a bidirectional easy-to-tear film comprises three layers, which are an outer layer, a middle layer and an inner layer in sequence,
-said outer layer consists of 20-70% by weight of high pressure low density polyethylene, 10-40% by weight of high density polyethylene, 15-65% by weight of linear low density polyethylene, 5-40% by weight of ethylene acrylic acid copolymer (EAA);
the middle layer consists of 10 to 60 weight percent of high-pressure low-density polyethylene, 10 to 50 weight percent of metallocene medium-density polyethylene, 15 to 60 weight percent of ethylene-methacrylic acid copolymer (EMAA), 15 to 65 weight percent of Ionomer (Ionomer) or ethylene-norbornane copolymer;
the inner layer consists of 25 to 64.5 weight percent of high-pressure low-density polyethylene, 15 to 50 weight percent of metallocene low-density polyethylene, 10 to 49.5 weight percent of linear low-density polyethylene, 10 to 40 weight percent of ethylene-octylene copolymer and 0.5 to 10 weight percent of functional master batch.
Furthermore, the functional master batch of the inner layer consists of a silicon dioxide opening agent, an antistatic agent and PPA.
Further, the high-pressure low-density polyethylene of the outer layer, the middle layer and the inner layer is produced by adopting a high-pressure tubular method or a kettle type method, the melt index is 0.75-10g/10min, and the density is 0.924-0.933g/cm3。
Further, the linear low density polyethylene of the outer layer and the inner layer is low density polyethylene copolymerized by butylene or hexane, the melt index is 1-2g/10min, and the density is 0.918-0.926g/cm3(ii) a The melt index of the outer layer of the high-density polyethylene is 0.07-2g/10min, and the density is 0.945-0.961g/cm3。
Furthermore, the content of the acrylic acid alkene of the ethylene-acrylic acid copolymer of the outer layer is 5-9.7%, and the melt index is 1-10g/cm3。
Further, the metallocene medium density polyethylene of the middle layer is any one of hexylene and octylene produced by using a metallocene catalyst, the melt index is 0.2-3.5g/min, and the density is 0.930-0.940g/cm3。
Further, the melt index of the ethylene-methacrylic acid copolymer of the middle layer is 0.5-2g/10min, and the density is 0.930-0.940g/cm3(ii) a The melt index of the ethylene-norbornene copolymer in the middle layer is 2-6g/10min, and the density is 1.01-1.02g/cm3。
Further, the metallocene low-density polyethylene of the inner layer is any one of hexylene and octylene produced by using a metallocene catalyst, the melt index is 1-2g/min, and the density is 0.915-0.920g/cm3。
Further, the melt index of the ethylene-octylene copolymer of the inner layer is 0.8-3.2g/10 min; the density is 0.890-0.910g/cm3。
Further, the weight ratio of the outer layer, the middle layer and the inner layer is 2:1:2 or 1:1:1 or 3:4:3 or 1:2:1 or 1:3: 1.
In conclusion, the bidirectional easy-to-tear film has the effect of easy-to-tear straight lines in the longitudinal and transverse directions, namely the bidirectional easy-to-tear straight lines, and also has the advantages of high composite fastness, good transparency, wide heat-sealing window, low heat-sealing temperature, suitability for high-speed packaging line production, effective improvement of production efficiency, cost reduction, good customer experience and the like.
Detailed Description
Example 1
The two-way easy-to-tear film described in this embodiment 1 has three layers of structures, which are an outer layer, a middle layer and an inner layer, respectively, and the weight percentages of the three layers of materials are as follows: 30% of an outer layer, 40% of a middle layer and 30% of an inner layer; each layer consists of the following components:
the outer layer comprises the following components in percentage by weight:
Figure BDA0001910645990000041
the middle layer comprises the following components in percentage by weight:
Figure BDA0001910645990000042
the inner layer comprises the following components in percentage by weight:
Figure BDA0001910645990000043
Figure BDA0001910645990000051
the method for preparing the bidirectional easy-to-tear film comprises the following steps: respectively mixing the raw materials of the outer layer, the middle layer and the inner layer according to the weight percentage by an automatic mixing system, respectively adding the raw materials of each layer into an outer layer extruder, a middle layer extruder and an inner layer extruder, respectively carrying out melting plasticization, then sending the obtained product into a die head, co-extruding the obtained product into film bubbles, cooling by an automatic air ring, carrying out corona treatment, and then rolling to obtain the bidirectional easily-torn film; wherein the temperature of the outer layer extruder is 165-180 ℃, and the extrusion pressure is 200-380 bar; the temperature of the middle layer extruder is 145-170 ℃, and the extrusion pressure is 250-450 bar; the temperature of the inner layer extruder is 160-175 ℃, and the extrusion pressure is 220-480 bar; the die temperature was 180 ℃ and 200 ℃.
Example 2
The embodiment 2 is modified based on the embodiment 1, and has the following characteristics that the weight percentages of the outer layer, the middle layer and the inner layer are different, and the components of the layers are the same:
in this embodiment 2, the weight percentages of the materials of the outer layer, the middle layer and the inner layer are respectively: 25% of outer layer, 50% of middle layer and 25% of inner layer.
Example 3
The two-way easy-to-tear film described in this embodiment 3 has three layers of structures, which are an outer layer, a middle layer and an inner layer, respectively, and the weight percentages of the three layers of materials are as follows: 20% of an outer layer, 55% of a middle layer and 25% of an inner layer; each layer consists of the following components:
the outer layer comprises the following components in percentage by weight:
Figure BDA0001910645990000052
Figure BDA0001910645990000061
the middle layer comprises the following components in percentage by weight:
Figure BDA0001910645990000062
the inner layer comprises the following components in percentage by weight:
Figure BDA0001910645990000063
example 4
This embodiment 4 is modified from embodiment 3, and has the following features that the weight percentages of the outer layer, the middle layer and the inner layer are different, and the components of the layers are the same: in this embodiment 4, the weight percentages of the materials of the outer layer, the middle layer and the inner layer are respectively: 20% of the outer layer, 60% of the middle layer and 20% of the inner layer.
Example 5
The two-way easy-to-tear film described in this embodiment 5 has three layers, which are an outer layer, a middle layer, and an inner layer, and the weight percentages of the three layers are: 35% of an outer layer, 45% of a middle layer and 25% of an inner layer; each layer consists of the following components:
the outer layer comprises the following components in percentage by weight:
Figure BDA0001910645990000071
the middle layer comprises the following components in percentage by weight:
Figure BDA0001910645990000072
the inner layer comprises the following components in percentage by weight:
Figure BDA0001910645990000073
example 6
The two-way easy-to-tear film described in this embodiment 6 has three layers of structures, which are an outer layer, a middle layer and an inner layer, and the weight percentages of the three layers of materials are respectively: 25% of outer layer, 50% of middle layer and 25% of inner layer; each layer consists of the following components:
the outer layer comprises the following components in percentage by weight:
Figure BDA0001910645990000081
the middle layer comprises the following components in percentage by weight:
Figure BDA0001910645990000082
the inner layer comprises the following components in percentage by weight:
Figure BDA0001910645990000083
TABLE 1
Figure BDA0001910645990000084
Figure BDA0001910645990000091
It can be seen from table 1 that the films of examples 1-6 have excellent tensile strength, elongation at break, and right angle tear strength, and have good effect of being easily torn in two directions.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solutions of the present invention in any way. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides a two-way easy dyestripping, has three layer construction to constitute, is skin, middle level and inlayer in proper order, its characterized in that:
the outer layer consists of 20 to 55 weight percent of high-pressure low-density polyethylene, 10 to 35 weight percent of high-density polyethylene, 15 to 35 weight percent of linear low-density polyethylene and 5 to 20 weight percent of ethylene-acrylic acid copolymer;
the middle layer consists of 10 to 60 weight percent of high-pressure low-density polyethylene, 10 to 50 weight percent of metallocene medium-density polyethylene, 15 to 60 weight percent of ethylene-methacrylic acid copolymer and 15 to 65 weight percent of ionomer or ethylene-norbornene copolymer;
the inner layer consists of 25 to 64.5 weight percent of high-pressure low-density polyethylene, 15 to 50 weight percent of metallocene low-density polyethylene, 10 to 49.5 weight percent of linear low-density polyethylene, 10 to 27.4 weight percent of ethylene-octene copolymer and 0.5 to 10 weight percent of functional master batch.
2. The two-way easy-tear film according to claim 1, wherein: the functional master batch of the inner layer consists of a silicon dioxide opening agent, an antistatic agent and PPA.
3. The two-way easy-tear film according to claim 1, wherein: the high-pressure low-density polyethylene of the outer layer, the middle layer and the inner layer is produced by adopting a high-pressure tubular method or a kettle type method, the melt index is 0.75-10g/10min, and the density is 0.924-0.933g/cm3。
4. According to claimClaim 1 the two-way easy-to-tear film is characterized in that: the linear low-density polyethylene of the outer layer and the inner layer is low-density polyethylene copolymerized by butene or hexene, the melt index is 1-2g/10min, and the density is 0.918-0.926g/cm3(ii) a The melt index of the outer layer of the high-density polyethylene is 0.07-2g/10min, and the density is 0.945-0.961g/cm3。
5. The two-way easy-tear film according to claim 1, wherein: the content of acrylic acid alkene of the ethylene-acrylic acid copolymer of the outer layer is 5-9.7%, and the melt index is 1-10g/cm3。
6. The two-way easy-tear film according to claim 1, wherein: the metallocene medium density polyethylene of the middle layer is any one of hexene and octene produced by a metallocene catalyst, the melt index is 0.2-3.5g/min, and the density is 0.930-0.940g/cm3。
7. The two-way easy-tear film according to claim 1, wherein: the melt index of the ethylene-methacrylic acid copolymer of the middle layer is 0.5-2g/10min, and the density is 0.930-0.940g/cm3(ii) a The melt index of the ethylene-norbornene copolymer in the middle layer is 2-6g/10min, and the density is 1.01-1.02g/cm3。
8. The two-way easy-tear film according to claim 1, wherein: the metallocene low-density polyethylene of the inner layer is any one of hexene and octene produced by using a metallocene catalyst, the melt index is 1-2g/min, and the density is 0.915-0.920g/cm3。
9. The two-way easy-tear film according to claim 1, wherein: the melt index of the ethylene-octene copolymer of the inner layer is 0.8-3.2g/10 min; the density is 0.890-0.910g/cm3。
10. The two-way easy-tear film according to claim 1, wherein: the weight ratio of the outer layer, the middle layer and the inner layer is 2:1:2 or 1:1:1 or 3:4:3 or 1:2:1 or 1:3: 1.
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CN115556450A (en) * 2022-09-26 2023-01-03 湖北慧狮塑业股份有限公司 Ultra-thin polyolefin dry film protective film

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