CN113524845A - Drinking water packaging film and preparation method thereof - Google Patents
Drinking water packaging film and preparation method thereof Download PDFInfo
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- CN113524845A CN113524845A CN202110920994.9A CN202110920994A CN113524845A CN 113524845 A CN113524845 A CN 113524845A CN 202110920994 A CN202110920994 A CN 202110920994A CN 113524845 A CN113524845 A CN 113524845A
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- 239000003651 drinking water Substances 0.000 title claims abstract description 31
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 31
- 239000012785 packaging film Substances 0.000 title claims abstract description 23
- 229920006280 packaging film Polymers 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000011347 resin Substances 0.000 claims abstract description 92
- 229920005989 resin Polymers 0.000 claims abstract description 92
- 239000010410 layer Substances 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005266 casting Methods 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000012792 core layer Substances 0.000 claims abstract description 10
- 238000001125 extrusion Methods 0.000 claims abstract description 9
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 7
- 238000007639 printing Methods 0.000 claims abstract description 7
- 238000010345 tape casting Methods 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims abstract description 3
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 30
- 238000002844 melting Methods 0.000 claims description 26
- 230000008018 melting Effects 0.000 claims description 26
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 22
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 22
- 239000012257 stirred material Substances 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 229920001903 high density polyethylene Polymers 0.000 claims description 11
- 239000004700 high-density polyethylene Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 abstract description 19
- 239000004698 Polyethylene Substances 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000005022 packaging material Substances 0.000 abstract description 3
- -1 polyethylene Polymers 0.000 abstract description 3
- 229920000573 polyethylene Polymers 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000011229 interlayer Substances 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- 238000003672 processing method Methods 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 229920003023 plastic Polymers 0.000 description 10
- 239000004033 plastic Substances 0.000 description 10
- 238000004064 recycling Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000013329 compounding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009459 flexible packaging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000013502 plastic waste Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A drinking water packaging film is characterized in that: the resin is composed of four resin layers, and the structural expression is as follows: A/B/C/D, the weight ratio of each layer is 1: 3: 3: 1, wherein the layer A is a printing heat-resistant layer, the layers B and C are functional core layers, and the layer D is a low-temperature heat-sealing layer. The preparation method of the drinking water packaging film is characterized by comprising the following steps: the drinking water packaging film is prepared by melt extrusion of resin raw materials by four extruders and tape casting processing and molding by a T-shaped die head. Compared with the prior art, the invention has the beneficial effects that the four resin layers are respectively processed and produced by adopting polyethylene raw materials and then are prepared by adopting a four-layer co-extrusion casting processing method, the four resin layers belong to a single material, the low-molecular polymer on the surface of the film is removed from the film subjected to water bath treatment, the film is cleaned for the second time, the peculiar smell on the surface of the film is removed, and the requirement of drinking water packaging on the peculiar smell sensitivity of a packaging material is met; the cost advantage is comprehensively considered in the design of the interlayer ratio of the four-layer co-extrusion film, so that the processing cost is lower.
Description
Technical Field
The invention relates to a packaging film, in particular to a drinking water packaging film which can be directly formed by bag making without compounding and is used for packaging drinking water and a preparation method thereof.
Background
Most of the traditional drinking water packages are plastic bottles or barrels, the raw materials are mostly polyester, and a part of the packages are polyethylene blow molded bottles; the packaging mode has better exhibition performance, but the consumption of the plastic used for packaging is large, so that the packaging cost is high; the packaging bottle becomes plastic waste after being used, which means that the generated pollution is large after being used; although the recycling treatment can be carried out, the waste empty bottles or empty barrels occupy large space for recycling, the transportation cost is high, the recycling treatment cost is increased, and in view of the above, the requirement of reducing and recycling plastic packages becomes stricter in view of cost and the global requirement of reducing and recycling plastic packages becomes stricter.
At present, a small part of drinking water is packaged by adopting a multi-layer composite plastic soft packaging bag, such as a PET/PA/PE structure, a BOPP/NY/PE structure and the like, the above soft packaging mode is really improved in the aspects of reduction of packaging materials and recovery and transportation after consumption compared with the traditional bottled or barreled packaging mode, but the above packaging mode belongs to the multi-layer composite soft packaging bag and is not a single material, the recovery treatment of the drinking water after use is very troublesome, and the drinking water packaging mode does not meet the requirements of economy and environmental protection; in addition, the inner layer material (film directly contacting water) of the existing multilayer composite flexible-package drinking water packaging bag has a certain peculiar smell to a greater or lesser extent, which affects the taste of water, so that the consumer cannot completely accept the type of packaging.
Along with the 'plastic restriction' implemented gradually by the country and the severe examination of the international environmental protection situation, especially along with the global sustainable development strategy advocated by numerous food enterprises and food packaging enterprises, namely '2025 realizes the recoverable scheme comprehensively', the plastic flexible packaging industry also faces challenges and opportunities. In order to reduce the pollution of waste plastics and promote the sustainable development of the industry, the plastic packaging industry is innovated from the aspects of materials, process design and the like, and the single material design which is beneficial to recycling becomes an important trend of the sustainable development in the field of plastic packaging, so that the sustainable development of materials can be better realized.
Disclosure of Invention
The invention aims to provide a drinking water packaging film which can be directly formed by bag making without compounding and used for packaging drinking water. The technical scheme is as follows:
a drinking water packaging film is characterized in that: the resin is composed of four resin layers, and the structural expression is as follows: A/B/C/D, the weight ratio of each layer is 1: 3: 3: 1, wherein the layer A is a printing heat-resistant layer, the layers B and C are functional core layers, and the layer D is a low-temperature heat-sealing layer.
Preferably, the printing heat-resistant layer of the layer A is made of 100% of high-density polyethylene resin; wherein the high density polyethylene resin has a density of 0.96g/㎤ and a melting point of 133 ℃.
Preferably, the functional core layer of the layer B is composed of 20% of linear low density polyethylene resin and 80% of metallocene linear low density polyethylene resin; wherein the linear low-density polyethylene resin has the density of 0.92g/㎤ and the melting point of 125 ℃; wherein the metallocene linear low density polyethylene resin has a density of 0.916g/㎤ and a melting point of 123 ℃.
Preferably, the functional core layer of the layer C is composed of 70% of linear low density polyethylene resin and 30% of metallocene linear low density polyethylene resin; wherein the linear low-density polyethylene resin has the density of 0.92g/㎤ and the melting point of 125 ℃; wherein the metallocene linear low density polyethylene resin has a density of 0.916g/㎤ and a melting point of 123 ℃.
Preferably, the low-temperature heat-sealing layer of the layer D consists of 30 percent of low-temperature heat-sealing type metallocene linear low-density polyethylene resin, 68 percent of low-odor metallocene linear low-density polyethylene resin and 2 percent of opening agent; wherein the low-temperature heat-sealing type metallocene linear low-density polyethylene resin has the density of 0.903g/㎤ and the melting point of 98 ℃; wherein the low-odor metallocene linear low-density polyethylene resin has the density of 0.918g/㎤ and the melting point of 116 ℃; wherein the density of the opening agent is 0.94g/㎤.
The second purpose of the invention is to provide a preparation method of the drinking water packaging film, which adopts the following technical scheme:
the preparation method of the drinking water packaging film is characterized by comprising the following steps: the drinking water packaging film is prepared by melt extrusion of resin raw materials by four extruders and tape casting processing and molding by a T-shaped die head.
In a preferred embodiment, the preparation method comprises the following steps:
1) according to the weight portion, 100 portions of the high-density polyethylene resin raw material is put into a bin of a double-screw extruder, the processing temperature of the extruder is set to 190-;
2) according to the weight portion, 60 portions of linear low-density polyethylene resin and 240 portions of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 190 plus materials and 235 ℃, and the screw rotating speed of the double-screw extruder is controlled to be 10-20 rad/min;
3) according to the weight portion, 210 portions of linear low-density polyethylene resin and 90 portions of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to 190 plus materials and 235 ℃, and the screw rotating speed of the double-screw extruder is controlled to be 10-20 rad/min;
4) according to the weight parts, 30 parts of low-temperature heat-sealing metallocene linear low-density polyethylene resin, 68 parts of low-odor metallocene linear low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to 190 plus 235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10-20 rad/min;
5) and casting the melt after melting and mixing by four extruders to a cooling roller through a T-shaped casting die head to form a film.
6) Washing the oligomer transferred to the surface of the film by a water bath device on a casting machine to remove the peculiar smell of the film, wherein the water bath temperature range is 80-90 ℃, and drying the film after water bath;
7) and (4) winding the film dried in the water bath into a roll.
Compared with the prior art, the invention has the beneficial effects that the four resin layers are respectively processed and produced by adopting polyethylene raw materials and then are prepared by adopting a four-layer co-extrusion casting processing method, the four resin layers belong to a single material, the low-molecular polymer on the surface of the film is removed from the film subjected to water bath treatment, the film is cleaned for the second time, the peculiar smell on the surface of the film is removed, and the requirement of drinking water packaging on the peculiar smell sensitivity of a packaging material is met; the four-layer co-extrusion film comprehensively considers the cost advantage in the design of the interlayer ratio (namely the extrusion capacity of four extruders), so that the processing cost is lower; the novel PE packaging film which is made of the single material and is special for the drinking water is provided, is simple and convenient to recycle and high in recycling value, and meets the requirements of economy, environmental protection and social development trend.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the drinking water packaging film in one embodiment of the present application is composed of four resin layers, and the structural expression thereof is: A/B/C/D, the weight ratio of each layer is 1: 3: 3: 1, wherein the layer A is a printing heat-resistant layer, the layers B and C are functional core layers, and the layer D is a low-temperature heat-sealing layer.
The printing heat-resistant layer of the layer A is made of 100% of high-density polyethylene resin; wherein the high density polyethylene resin has a density of 0.96g/㎤ and a melting point of 133 ℃.
The functional core layer of the layer B consists of 20 percent of linear low density polyethylene resin and 80 percent of metallocene linear low density polyethylene resin; wherein the linear low-density polyethylene resin has the density of 0.92g/㎤ and the melting point of 125 ℃; wherein the metallocene linear low density polyethylene resin has a density of 0.916g/㎤ and a melting point of 123 ℃.
The functional core layer of the layer C is composed of 70% of linear low density polyethylene resin and 30% of metallocene linear low density polyethylene resin; wherein the linear low-density polyethylene resin has the density of 0.92g/㎤ and the melting point of 125 ℃; wherein the metallocene linear low density polyethylene resin has a density of 0.916g/㎤ and a melting point of 123 ℃.
The low-temperature heat sealing layer of the layer D consists of 30 percent of low-temperature heat sealing type metallocene linear low-density polyethylene resin, 68 percent of low-odor metallocene linear low-density polyethylene resin and 2 percent of opening agent; wherein the low-temperature heat-sealing type metallocene linear low-density polyethylene resin has the density of 0.903g/㎤ and the melting point of 98 ℃; wherein the low-odor metallocene linear low-density polyethylene resin has the density of 0.918g/㎤ and the melting point of 116 ℃; (ii) a Wherein the density of the opening agent is 0.94g/㎤.
The drinking water packaging film is prepared by melt extrusion of resin raw materials through four extruders and tape casting through a T-shaped die.
In a first alternative embodiment, the preparation method comprises the following steps:
1) according to the weight portion, 100 portions of high-density polyethylene resin raw materials are put into a bin of a double-screw extruder, the processing temperature of the extruder is set to be 190 ℃, and the rotating speed of screws of the double-screw extruder is controlled to be 10 rad/min;
2) according to the weight parts, 60 parts of linear low-density polyethylene resin and 240 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 190 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10 rad/min;
3) according to the weight parts, 210 parts of linear low-density polyethylene resin and 90 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 190 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10 rad/min;
4) according to the weight parts, 30 parts of low-temperature heat-sealing metallocene linear low-density polyethylene resin, 68 parts of low-odor metallocene linear low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 190 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10 rad/min;
5) and casting the melt after melting and mixing by four extruders to a cooling roller through a T-shaped casting die head to form a film.
6) Washing the oligomer transferred to the surface of the film by a water bath device on a casting machine to remove the peculiar smell of the film, wherein the water bath temperature is 80 ℃, and drying the film after water bath;
7) and (4) winding the film dried in the water bath into a roll.
In a second alternative embodiment, the method of manufacture comprises the steps of:
1) according to the weight portion, 100 portions of high-density polyethylene resin raw materials are put into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 235 ℃, and the rotating speed of screws of the double-screw extruder is controlled to be 20 rad/min;
2) according to the weight parts, 60 parts of linear low-density polyethylene resin and 240 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 20 rad/min;
3) according to the weight parts, 210 parts of linear low-density polyethylene resin and 90 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 20 rad/min;
4) according to the weight parts, 30 parts of low-temperature heat-sealing metallocene linear low-density polyethylene resin, 68 parts of low-odor metallocene linear low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to 235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 20 rad/min;
5) and casting the melt after melting and mixing by four extruders to a cooling roller through a T-shaped casting die head to form a film.
6) Washing the oligomer transferred to the surface of the film by a water bath device on a casting machine to remove the peculiar smell of the film, wherein the water bath temperature is 90 ℃, and drying the film after water bath;
7) and (4) winding the film dried in the water bath into a roll.
In a third alternative embodiment, the method of manufacture comprises the steps of:
1) according to the weight portion, 100 portions of high-density polyethylene resin raw materials are put into a bin of a double-screw extruder, the processing temperature of the extruder is set to be 205 ℃, and the rotating speed of screws of the double-screw extruder is controlled to be 15 rad/min;
2) according to the weight parts, 60 parts of linear low-density polyethylene resin and 240 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a bin of a double-screw extruder, the processing temperature of the extruder is set to 195 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 16 rad/min;
3) according to the weight parts, 210 parts of linear low-density polyethylene resin and 90 parts of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a bin of a double-screw extruder, the processing temperature of the extruder is set to 215 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to 12 rad/min;
4) according to the weight parts, 30 parts of low-temperature heat-sealing metallocene linear low-density polyethylene resin, 68 parts of low-odor metallocene linear low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred raw materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to 198 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 16 rad/min;
5) and casting the melt after melting and mixing by four extruders to a cooling roller through a T-shaped casting die head to form a film.
6) Washing the oligomer transferred to the surface of the film by a water bath device on a casting machine to remove the peculiar smell of the film, wherein the water bath temperature is 85 ℃, and drying the film after water bath;
7) and (4) winding the film dried in the water bath into a roll.
In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and the equivalent or simple change of the structure, the characteristics and the principle described in the present patent idea is included in the protection scope of the present patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (8)
1. A drinking water packaging film is characterized in that: the resin is composed of four resin layers, and the structural expression is as follows: A/B/C/D, the weight ratio of each layer is 1: 3: 3: 1, wherein the layer A is a printing heat-resistant layer, the layers B and C are functional core layers, and the layer D is a low-temperature heat-sealing layer.
2. A drinking water packaging film as set forth in claim 1, wherein: the printing heat-resistant layer of the layer A is made of 100% of high-density polyethylene resin; wherein the high density polyethylene resin has a density of 0.96g/㎤ and a melting point of 133 ℃.
3. A drinking water packaging film as set forth in claim 1, wherein: the functional core layer of the layer B consists of 20 percent of linear low density polyethylene resin and 80 percent of metallocene linear low density polyethylene resin; wherein the linear low-density polyethylene resin has the density of 0.92g/㎤ and the melting point of 125 ℃; wherein the metallocene linear low density polyethylene resin has a density of 0.916g/㎤ and a melting point of 123 ℃.
4. A drinking water packaging film as set forth in claim 1, wherein: the functional core layer of the layer C is composed of 70% of linear low density polyethylene resin and 30% of metallocene linear low density polyethylene resin; wherein the linear low-density polyethylene resin has the density of 0.92g/㎤ and the melting point of 125 ℃; wherein the metallocene linear low density polyethylene resin has a density of 0.916g/㎤ and a melting point of 123 ℃.
5. A drinking water packaging film as set forth in claim 1, wherein: the low-temperature heat sealing layer of the layer D consists of 30 percent of low-temperature heat sealing type metallocene linear low-density polyethylene resin, 68 percent of low-odor metallocene linear low-density polyethylene resin and 2 percent of opening agent; wherein the low-temperature heat-sealing type metallocene linear low-density polyethylene resin has the density of 0.903g/㎤ and the melting point of 98 ℃; wherein the low-odor metallocene linear low-density polyethylene resin has the density of 0.918g/㎤ and the melting point of 116 ℃; wherein the density of the opening agent is 0.94g/㎤.
6. The method for preparing a drinking water packaging film according to any one of claims 1 to 5, wherein: the drinking water packaging film is prepared by melt extrusion of resin raw materials by four extruders and tape casting processing and molding by a T-shaped die head.
7. The method for preparing a drinking water packaging film according to claim 6, wherein: the preparation method comprises the following steps:
according to the weight portion, 100 portions of the high-density polyethylene resin raw material is put into a bin of a double-screw extruder, the processing temperature of the extruder is set to 190-;
according to the weight portion, 60 portions of linear low-density polyethylene resin and 240 portions of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to be 190 plus materials and 235 ℃, and the screw rotating speed of the double-screw extruder is controlled to be 10-20 rad/min;
according to the weight portion, 210 portions of linear low-density polyethylene resin and 90 portions of metallocene linear low-density resin are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to 190 plus materials and 235 ℃, and the screw rotating speed of the double-screw extruder is controlled to be 10-20 rad/min;
according to the weight parts, 30 parts of low-temperature heat-sealing metallocene linear low-density polyethylene resin, 68 parts of low-odor metallocene linear low-density polyethylene resin and 2 parts of opening agent master batches are put into stirring equipment, the stirring time is set until the materials are uniformly stirred, the uniformly stirred materials are poured into a storage bin of a double-screw extruder, the processing temperature of the extruder is set to 190 plus 235 ℃, and the rotating speed of a screw of the double-screw extruder is controlled to be 10-20 rad/min;
and casting the melt after melting and mixing by four extruders to a cooling roller through a T-shaped casting die head to form a film.
8. Washing the oligomer transferred to the surface of the film by a water bath device on a casting machine to remove the peculiar smell of the film, wherein the water bath temperature range is 80-90 ℃, and drying the film after water bath;
7) and (4) winding the film dried in the water bath into a roll.
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