CN112238661A - Milky white composite film layer and film blowing method thereof - Google Patents
Milky white composite film layer and film blowing method thereof Download PDFInfo
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- CN112238661A CN112238661A CN201910643273.0A CN201910643273A CN112238661A CN 112238661 A CN112238661 A CN 112238661A CN 201910643273 A CN201910643273 A CN 201910643273A CN 112238661 A CN112238661 A CN 112238661A
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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
- 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)
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
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, the inner layer film comprising 20 parts of low density polyethylene, 35 parts of linear low density polyethylene, and 20 parts of imported metallocene; the middle layer film is compounded on the outer side of the inner layer film, and contains 50 parts of low-density polyethylene, 65 parts of non-opening linear low-density polyethylene and 10 parts of milky white master batch; the outer layer film is compounded on the outer side of the middle layer film and contains 35 parts of low-density polyethylene, 15 parts of open linear low-density polyethylene, 20 parts of non-open linear low-density polyethylene, 35 parts of imported metallocene and 6 parts of milky white master batch. According to the invention, the inner layer film, the middle layer film and the outer layer film with different contents are blown out by film blowing, the milky white master batch and the metallocene are added to enhance the milky white color, and then extrusion compounding molding is carried out, so that the troubles of single-layer polyethylene film effect and small application range in the prior art are avoided.
Description
Technical Field
The invention belongs to the field of composite film processing, and particularly relates to a milky white 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.
Because of the difficulty of printing, common polyethylene materials are colorless or light-colored products, which greatly limits the application range, and the single-layer design also limits the application range, and lacks a composite multi-film layer.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a milky white composite film and a film blowing method thereof, wherein the milky white composite film is formed by blowing an inner layer film, a middle layer film and an outer layer film with different contents, adding milky white master batch and metallocene to enhance the milky white color, and then performing extrusion composite molding, thereby avoiding the troubles of single-layer polyethylene film and small application range in the past.
In order to solve the technical problem, 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, the inner layer film comprising 20 parts of low density polyethylene, 35 parts of linear low density polyethylene, and 20 parts of imported metallocene; the middle layer film is compounded on the outer side of the inner layer film, and contains 50 parts of low-density polyethylene, 65 parts of non-opening linear low-density polyethylene and 10 parts of milky white master batch; the outer layer film is compounded on the outer side of the middle layer film and contains 35 parts of low-density polyethylene, 15 parts of open linear low-density polyethylene, 20 parts of non-open linear low-density polyethylene, 35 parts of imported metallocene and 6 parts of milky white master batch.
According to an embodiment of the present invention, the thickness of the inner layer film, the middle layer film and the outer layer film after being laminated is not more than 55 μm.
A film blowing method of a milky composite film layer comprises the following steps:
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, the middle layer film and the outer layer film with different contents are blown out by film blowing, the milky white master batch and the metallocene are added to enhance the milky white color, and then extrusion compounding molding is carried out, 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, the inner layer film comprising 20 parts of low density polyethylene, 35 parts of linear low density polyethylene, and 20 parts of imported metallocene; the middle layer film is compounded on the outer side of the inner layer film, and contains 50 parts of low-density polyethylene, 65 parts of non-opening linear low-density polyethylene and 10 parts of milky white master batch; the outer layer film is compounded on the outer side of the middle layer film and contains 35 parts of low-density polyethylene, 15 parts of open linear low-density polyethylene, 20 parts of non-open linear low-density polyethylene, 35 parts of imported metallocene and 6 parts of milky white master batch.
In one embodiment of the invention, according to 1kg as 1 part, 20kg of low density polyethylene, 35kg of linear low density polyethylene and 20kg of imported metallocene are selected and used for forming the inner film layer, wherein the imported metallocene is an organic metal coordination compound formed by connecting transition metal and cyclopentadiene, the catalytic effect is achieved, the processing performance is good, the strength is high, the rigidity and the transparency are good, and the performances in the aspects of temperature resistance, chemical resistance film manufacturing and the like are obviously improved. The middle layer film is made of 50kg of low density polyethylene, 65kg of non-opening linear low density polyethylene and 10kg of milky white master batch, wherein the milky white master batch is milky white color master batch, and the milky white master batch is filled into the processing film layer to discolor transparent polyethylene and enhance privacy and durability effects, and the non-opening linear low density polyethylene is not added with an opening agent. The outer layer film comprises 35kg of low density polyethylene, 15kg of open linear low density polyethylene, 20kg of non-open linear low density polyethylene, 35kg of imported metallocene and 6kg of milky white master batch, and for the outer layer film, the content of the imported metallocene needs to be increased to enhance the catalytic effect, and then a small amount of milky white master batch is further added to perform transition and soften color. Finally, through an extrusion compounding process, a milky composite film layer is formed, the durability is enhanced, and the application range is widened.
The invention selects 4 sets of embodiments: layer one film: 50 parts of low-density polyethylene, 65 parts of linear low-density polyethylene and 10 parts of milky white master batch; ② three layers of films: an inner layer film, the inner layer film comprising 20 parts of low density polyethylene, 35 parts of linear low density polyethylene, and 20 parts of imported metallocene; the outer layer film is compounded on the outer side of the inner layer film, and the outer layer film contains 50 parts of low-density polyethylene, 65 parts of non-open linear low-density polyethylene and 10 parts of milky white master batch; ③ three layers of films: an inner layer film, the inner layer film comprising 20 parts of low density polyethylene, 35 parts of linear low density polyethylene, and 20 parts of imported metallocene; the middle layer film is compounded on the outer side of the inner layer film, and contains 50 parts of low-density polyethylene, 65 parts of non-opening linear low-density polyethylene and 10 parts of milky white master batch; the outer layer film is compounded on the outer side of the middle layer film and contains 35 parts of low-density polyethylene, 15 parts of open linear low-density polyethylene, 20 parts of non-open linear low-density polyethylene, 35 parts of imported metallocene and 6 parts of milky white master batch; fourthly, five layers of films: the inner layer film comprises 20 parts of low-density polyethylene and 35 parts of linear low-density polyethylene; middle layer film compounded on two sides of the inner layer film, the middle layer film contains 50 portions of low density polyethylene, 65 portions of non-opening linear low density polyethylene and 10 portions of milky white master batch; and the outer layer film is compounded on two sides of the middle layer film and contains 35 parts of low density polyethylene, 15 parts of open linear low density polyethylene, 20 parts of non-open linear low density polyethylene and 6 parts of milky white master batch.
| Example (1) | Example 2 | EXAMPLE c | Example 4 | |
| Colour(s) | Semi-transparent | Translucent, having milkWhite colour (Bai) | Opaque, milky white | Non-transparent with white stripes |
| 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 opaque milky white, 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 55 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.
According to the invention, the inner layer film, the middle layer film and the outer layer film with different contents are blown out by film blowing, in addition, the milky white master batch and the metallocene are added to enhance the milky white color, and then extrusion compounding molding is carried out, so that the troubles of single effect and small application range of the conventional single-layer polyethylene film are avoided.
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 (4)
1. The milky white composite film layer is formed into three film layers by an extrusion compounding method, and is characterized by comprising the following components in parts by weight:
an inner layer film comprising 20 parts of low density polyethylene, 35 parts of linear low density polyethylene, and 20 parts of an imported metallocene;
the middle layer film is compounded on the outer side of the inner layer film and contains 50 parts of low-density polyethylene, 65 parts of non-opening linear low-density polyethylene and 10 parts of milky white master batch;
the outer layer film is compounded on the outer side of the middle layer film and contains 35 parts of low-density polyethylene, 15 parts of open linear low-density polyethylene, 20 parts of non-open linear low-density polyethylene, 35 parts of imported metallocene and 6 parts of milky white master batch.
2. The milky white composite film according to claim 1, wherein the thickness of the inner film, the middle film and the outer film after being compounded is not more than 55 μm.
3. A method for processing the milky white 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 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.
4. The method for blowing the milky white composite film according to claim 3, wherein in the step c, the film is further blown to reduce the thickness of the film by adjusting the die gap, increasing the pulling speed or reducing the air volume of the air ring, or vice versa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910643273.0A CN112238661A (en) | 2019-07-17 | 2019-07-17 | Milky white composite film layer and film blowing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910643273.0A CN112238661A (en) | 2019-07-17 | 2019-07-17 | Milky white composite film layer and film blowing method thereof |
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| CN112238661A true CN112238661A (en) | 2021-01-19 |
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| CN201910643273.0A Pending CN112238661A (en) | 2019-07-17 | 2019-07-17 | Milky white composite film layer and film blowing method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104476868A (en) * | 2014-12-03 | 2015-04-01 | 宿州市紫金塑业有限公司 | Ultraviolet ray-blocking transparent film |
| 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 |
| CN106832527A (en) * | 2017-02-24 | 2017-06-13 | 台州市路桥瑞康家庭用品厂 | A kind of refuse bag and its preparation technology |
| CN109747253A (en) * | 2017-11-07 | 2019-05-14 | 长沙银腾塑印包装有限公司 | A kind of blow molding PE film and its production method |
-
2019
- 2019-07-17 CN CN201910643273.0A patent/CN112238661A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104476868A (en) * | 2014-12-03 | 2015-04-01 | 宿州市紫金塑业有限公司 | Ultraviolet ray-blocking transparent film |
| 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 |
| CN106832527A (en) * | 2017-02-24 | 2017-06-13 | 台州市路桥瑞康家庭用品厂 | A kind of refuse bag and its preparation technology |
| CN109747253A (en) * | 2017-11-07 | 2019-05-14 | 长沙银腾塑印包装有限公司 | A kind of blow molding PE film and its production method |
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