CN112238662A - Transparent composite film layer and film blowing method thereof - Google Patents

Transparent composite film layer and film blowing method thereof Download PDF

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Publication number
CN112238662A
CN112238662A CN201910643298.0A CN201910643298A CN112238662A CN 112238662 A CN112238662 A CN 112238662A CN 201910643298 A CN201910643298 A CN 201910643298A CN 112238662 A CN112238662 A CN 112238662A
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China
Prior art keywords
film
parts
density polyethylene
layer
layer film
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910643298.0A
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Chinese (zh)
Inventor
钱小波
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Danyang Chunxiao Plastic Industry Co ltd
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Danyang Chunxiao Plastic Industry Co ltd
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Priority to CN201910643298.0A priority Critical patent/CN112238662A/en
Publication of CN112238662A publication Critical patent/CN112238662A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • 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
    • 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
    • B32B27/32—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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)

Abstract

The invention discloses a transparent composite film layer, which is formed into three film layers by an extrusion compounding method and comprises the following components in parts by mass: an inner layer film comprising 35 parts of low density polyethylene, 45 parts of open linear low density polyethylene, and 20 parts of non-open linear low density polyethylene; and the outer layer film is compounded on two sides of the inner layer film, and contains 50 parts of low density polyethylene, 55 parts of linear low density polyethylene, 1 part of opaque filling master batch and 0.8 part of opening agent. The invention can avoid the trouble of single effect and small application range of the traditional single-layer polyethylene film by blowing the inner layer film and the outer layer film with different contents and then extruding and compounding for molding.

Description

Transparent composite film layer and film blowing method thereof
Technical Field
The invention belongs to the field of composite film processing, and particularly relates to a transparent composite film layer and a film blowing method thereof.
Background
The polyethylene material is thermoplastic resin prepared by polymerizing ethylene, and has the characteristics of excellent low-temperature resistance, excellent electrical insulation, good chemical stability and resistance to corrosion of most of acid and alkali. Polyethylene materials at normal temperature are insoluble in general solvents and have low water absorption, and are widely used for the production of films, hollow articles, fibers, daily sundry goods, and the like.
The existing polyethylene film is used in a single layer mode or compounded in two layers at the later stage, so that the transparency of the polyethylene film is influenced, the application range of the polyethylene film is greatly limited, the single-layer or double-layer design and processing technology is limited, and a novel multi-film layer manufacturing method is lacked.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a transparent composite film and a film blowing method thereof, wherein the inner layer film and the outer layer film with different contents are blown out by film blowing, and then extrusion composite molding is performed, so that the problems of single effect and small application range of the conventional single layer polyethylene film are avoided.
In order to solve the technical problem, the invention discloses a transparent composite film layer, which is formed into three film layers by an extrusion compounding method and comprises the following components in parts by mass: an inner layer film comprising 35 parts of low density polyethylene, 45 parts of open linear low density polyethylene, and 20 parts of non-open linear low density polyethylene; and the outer layer film is compounded on two sides of the inner layer film, and contains 50 parts of low density polyethylene, 55 parts of linear low density polyethylene, 1 part of opaque filling master batch and 0.8 part of opening agent.
The thickness of the inner layer film and the outer layer film after being compounded is not more than 45 mu m.
The opaque filler masterbatch is a transparent filler masterbatch with 2% pigment masterbatch.
The opening agent is selected from silicon dioxide opening agents.
A method of blowing a transparent composite film layer comprising:
step a, starting a main motor of a film blowing machine, operating at a low speed of 12-100 r/min, heating to 70 ℃, preheating for 1-2 hours, weighing raw materials in parts, and filling the raw materials into the film blowing machine for melting; heating for 4 hours, heating to 160 ℃ in a gradient manner, extruding the materials, connecting an air pump to inflate the materials after the materials are extruded to form film bubbles, and then immediately starting a fan;
b, feeding the bubble tube into a traction roller, and winding along a guide roller;
c, adjusting the traction speed according to different thickness requirements, starting a rotary button and rotating the die head to respectively form and output an inner layer film, a middle layer film and an outer layer film;
and d, pressing and compounding the inner layer film, the middle layer film and the outer layer film by an extrusion compounding method, and cooling to form the milky composite film layer.
According to an embodiment of the present invention, in step c, the film may be further blown to reduce the thickness of the film layer by adjusting the die gap, increasing the pulling speed, or decreasing the air volume of the air ring, or vice versa.
Compared with the prior art, the invention can obtain the following technical effects:
the inner layer film and the outer layer film with different contents are blown out by film blowing and then extruded and compounded for forming, so that the troubles of single effect and small application range of the conventional single-layer polyethylene film are avoided.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
Detailed Description
The following embodiments are described in detail with reference to the accompanying drawings, so that how to implement the technical features of the present invention to solve the technical problems and achieve the technical effects can be fully understood and implemented.
The invention discloses a milky white composite film layer, which is formed into three film layers by an extrusion compounding method and comprises the following components in parts by weight: an inner layer film comprising 35 parts of low density polyethylene, 45 parts of open linear low density polyethylene, and 20 parts of non-open linear low density polyethylene; and the outer layer film is compounded on two sides of the inner layer film, and contains 50 parts of low density polyethylene, 55 parts of linear low density polyethylene, 1 part of opaque filling master batch and 0.8 part of opening agent.
In one embodiment of the present invention, 1kg of the inner film layer is formed by using 35kg of low density polyethylene, 45kg of open linear low density polyethylene and 20kg of unopened linear low density polyethylene in 1 portion. The outer film was made of 50kg of low density polyethylene, 55kg of linear low density polyethylene, 1kg of opaque filler masterbatch, and 0.8kg of a cell opener. Wherein the non-open linear low density polyethylene is not added with an opening agent. Finally, a transparent composite film layer is formed through an extrusion compounding process, the durability is enhanced, and the application range is widened.
The opaque filling master batch is a transparent filling master batch added with 2% pigment master batch, so that the color is changed, the transparency of the outer layer film after molding is not affected, and a stable effect is achieved.
The opening agent is selected from silicon dioxide opening agents, and can effectively improve the opening performance of the film.
The invention selects 4 sets of embodiments: layer one film: an inner layer film comprising 35 parts of low density polyethylene, 45 parts of open linear low density polyethylene, and 20 parts of non-open linear low density polyethylene; ② three layers of films: an inner layer film comprising 35 parts of low density polyethylene, 45 parts of open linear low density polyethylene, and 20 parts of non-open linear low density polyethylene; the outer layer film is compounded on two sides of the inner layer film, and the outer layer film contains 50 parts of low-density polyethylene, 55 parts of linear low-density polyethylene and 0.8 part of an opening agent; ③ three layers of films: an inner layer film comprising 35 parts of low density polyethylene, 45 parts of open linear low density polyethylene, and 20 parts of non-open linear low density polyethylene; the outer layer film is compounded on two sides of the inner layer film, and contains 50 parts of low-density polyethylene, 55 parts of linear low-density polyethylene, 1 part of opaque filling master batch and 0.8 part of opening agent; fourthly, two layers of films: an inner layer film comprising 35 parts of low density polyethylene, 45 parts of open linear low density polyethylene, and 20 parts of non-open linear low density polyethylene; and the outer layer film is compounded on the outer side of the inner layer film and contains 50 parts of low-density polyethylene, 55 parts of linear low-density polyethylene and 0.8 part of opening agent.
Example (1) Example 2 EXAMPLE c Example 4
Colour(s) Is transparent Transparent, having spots Is transparent Transparent, having spots
Uniformity of the film Uniformity Unevenness of Uniformity Unevenness of
Surface tension 35 dyne 38 dyne 40 dyne 30 dyne
As can be seen from the above table, when the embodiment (c) is selected, the color of the composite film can be transparent, the whole surface is uniform, the surface tension reaches the maximum, the durability is improved, and the whole stability of the composite film layer is the best.
The thickness of the inner layer film, the middle layer film and the outer layer film after being compounded is not more than 45 mu m, and the film is suitable for processing most film bags.
The invention also discloses a film blowing method of the milky composite film layer, which comprises the following steps:
a, starting a main motor of a film blowing machine, operating at a low speed of 12-100 r/min, heating to 70 ℃, preheating for 1-2 hours, weighing raw materials according to the parts of each film layer, and filling the raw materials into the film blowing machine for melting; heating for 4 hours, heating to 160 ℃ in a gradient manner, extruding the materials, connecting an air pump to inflate the materials after the materials are extruded to form film bubbles, and then immediately starting a fan;
b, feeding the bubble tube into a traction roller, and winding along a guide roller;
c, adjusting the traction speed according to different thickness requirements, starting a rotary button and enabling the die head to rotate, and forming and outputting an inner layer film, a middle layer film and an outer layer film respectively;
and d, pressing and compounding the inner layer film, the middle layer film and the outer layer film by an extrusion compounding method, and cooling to form the milky composite film layer.
In the step c, the film is further blown to reduce the thickness of the film layer by adjusting the clearance of the die orifice, improving the traction speed or reducing the air quantity of the air ring, otherwise, the film is adjusted in the same way.
The invention can avoid the trouble of single effect and small application range of the traditional single-layer polyethylene film by blowing the inner layer film and the outer layer film with different contents and then extruding and compounding for molding.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. A transparent composite film layer is formed into a three-layer film layer by an extrusion compounding method, and is characterized by comprising the following components in parts by mass:
an inner layer film comprising 35 parts of low density polyethylene, 45 parts of open linear low density polyethylene, and 20 parts of unopened linear low density polyethylene;
and the outer layer film is compounded on two sides of the inner layer film and contains 50 parts of low-density polyethylene, 55 parts of linear low-density polyethylene, 1 part of opaque filling master batch and 0.8 part of opening agent.
2. The transparent composite film layer of claim 1, wherein the inner film and the outer film have a thickness of no more than 45 μm after being combined.
3. The transparent composite film layer of claim 1, wherein the opaque filler masterbatch is provided as a transparent filler masterbatch with 2% pigment masterbatch added.
4. The transparent composite film layer of claim 1, wherein the opening agent is selected from silica opening agents.
5. A film blowing method of processing the transparent composite film layer of claim 1, comprising:
step a, starting a main motor of a film blowing machine, operating at a low speed of 12-100 r/min, heating to 70 ℃, preheating for 1-2 hours, weighing raw materials in parts, and filling the raw materials into the film blowing machine for melting; heating for 4 hours, heating to 160 ℃ in a gradient manner, extruding materials, connecting an air pump to inflate after the materials are extruded to form film bubbles, and then immediately starting a fan;
b, feeding the bubble tube into a traction roller, and winding along a guide roller;
c, adjusting the traction speed according to different thickness requirements, starting a rotary button and rotating the die head to respectively form and output an inner layer film, a middle layer film and an outer layer film;
and d, pressing and compounding the inner layer film, the middle layer film and the outer layer film by an extrusion compounding method, and cooling to form the milky composite film layer.
6. The method of claim 5, wherein in step c, the film thickness is reduced by adjusting the die gap, increasing the pulling speed, or decreasing the air volume of the air ring, so that the film is further inflated, and vice versa.
CN201910643298.0A 2019-07-17 2019-07-17 Transparent composite film layer and film blowing method thereof Pending CN112238662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910643298.0A CN112238662A (en) 2019-07-17 2019-07-17 Transparent composite film layer and film blowing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910643298.0A CN112238662A (en) 2019-07-17 2019-07-17 Transparent composite film layer and film blowing method thereof

Publications (1)

Publication Number Publication Date
CN112238662A true CN112238662A (en) 2021-01-19

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104924561A (en) * 2015-06-15 2015-09-23 青岛正大环保科技有限公司 Production process of three-layer co-extrusion film
CN107097498A (en) * 2016-06-08 2017-08-29 长沙银腾塑印包装有限公司 The PE films and its production method of a kind of high transparency
CN108773137A (en) * 2018-06-25 2018-11-09 青岛东海包装产业有限公司 Automatically it is packed for polyethylene film and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104924561A (en) * 2015-06-15 2015-09-23 青岛正大环保科技有限公司 Production process of three-layer co-extrusion film
CN107097498A (en) * 2016-06-08 2017-08-29 长沙银腾塑印包装有限公司 The PE films and its production method of a kind of high transparency
CN108773137A (en) * 2018-06-25 2018-11-09 青岛东海包装产业有限公司 Automatically it is packed for polyethylene film and preparation method thereof

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Application publication date: 20210119