CN114055889A - All-plastic composite toothpaste tube sheet suitable for recycling and production method thereof - Google Patents
All-plastic composite toothpaste tube sheet suitable for recycling and production method thereof Download PDFInfo
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- CN114055889A CN114055889A CN202111202889.8A CN202111202889A CN114055889A CN 114055889 A CN114055889 A CN 114055889A CN 202111202889 A CN202111202889 A CN 202111202889A CN 114055889 A CN114055889 A CN 114055889A
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- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 229920003023 plastic Polymers 0.000 title claims abstract description 29
- 239000004033 plastic Substances 0.000 title claims abstract description 29
- 229940034610 toothpaste Drugs 0.000 title claims abstract description 25
- 239000000606 toothpaste Substances 0.000 title claims abstract description 25
- 238000004064 recycling Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 claims abstract description 43
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 33
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 33
- 239000011247 coating layer Substances 0.000 claims abstract description 22
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims abstract description 19
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 18
- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920000642 polymer Polymers 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 15
- 239000004595 color masterbatch Substances 0.000 claims abstract description 11
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 10
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 10
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 117
- 239000002994 raw material Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 239000004840 adhesive resin Substances 0.000 claims description 14
- 229920006223 adhesive resin Polymers 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 14
- 239000012790 adhesive layer Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 238000003851 corona treatment Methods 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 238000010096 film blowing Methods 0.000 claims description 5
- -1 polyethylene Polymers 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 238000007765 extrusion coating Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000004594 Masterbatch (MB) Substances 0.000 claims 1
- 238000004806 packaging method and process Methods 0.000 abstract description 16
- 230000004888 barrier function Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000003854 Surface Print Methods 0.000 abstract description 2
- 230000036314 physical performance Effects 0.000 abstract description 2
- 238000003860 storage Methods 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 80
- 238000001816 cooling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 239000005022 packaging material Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
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- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
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- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
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- B32B2307/00—Properties of the layers or laminate
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Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention relates to the field of packaging, in particular to a full-plastic composite toothpaste tube sheet suitable for recycling and a production method thereof. The sheet material consists of a surface film, a coating layer and an inner film in sequence from outside to inside, wherein the surface film consists of 52.8 wt% of high-density polyethylene, 30.6 wt% of metallocene polyethylene, 13.2 wt% of white color master batch and 3.4 wt% of processing aid; the coating layer is low-density polyethylene; the inner film was composed of 34% by weight of high density polyethylene, 34% by weight of metallocene polyethylene, 18% of a binder resin and 14% of an ethylene-vinyl alcohol polymer. The sheet provided by the invention has good physical performance index, is suitable for high-speed surface printing, has good barrier performance, can effectively protect package contents, and is beneficial to long-time storage of products. The sheet material of the invention meets the food sanitation and safety standard, and not only can be used for daily chemical packaging, but also can be widely applied to the fields of food packaging and the like.
Description
Technical Field
The invention relates to the field of packaging, in particular to a full-plastic composite toothpaste tube sheet suitable for recycling and a production method thereof.
Background
In the daily chemical packaging industry, various packaging materials and different printed patterns attract wide consumers. However, with the change of the consumption concept of people, the pursuit of the quality of life is improved, and the requirements on the packaging grade are changed. With the enhancement of international environmental awareness, the product packaging tends to be green, low-carbon and recyclable.
At present, a great part of the aluminum-plastic packaging structure of daily chemical products is being changed to a recyclable material structure, and especially under the requirements of new environmental protection laws and regulations, the attention of production enterprises on the packaging material and packaging safety of the products is raised to a new height, and the change of the packaging and the different degrees influence the brand awareness and the consumer favor degree of the production enterprises. In addition, under the condition that the state requires the plastic industry to reduce and reduce the plastic, even forbid the plastic, the plastic packaging industry faces a great turn, and the recyclability of the plastic becomes one of the focus points of people.
In the daily chemical toothpaste industry, the currently used tube packaging materials all contain aluminum foils or aluminum-plated films which are composite materials which are not beneficial to recycling, the recycling difficulty of the structures is high, the recycling value is low, and the existing toothpaste tube packaging materials are urgently needed to be improved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an all-plastic composite toothpaste tube sheet material suitable for recycling.
The technical scheme adopted by the invention is as follows:
a full plastic composite toothpaste tube sheet material suitable for recycling,
the sheet comprises a surface film, a coating layer and an inner film in sequence from outside to inside, wherein the surface film comprises 52.8 wt% of high-density polyethylene, 30.6 wt% of metallocene polyethylene, 13.2 wt% of white color master batch and 3.4 wt% of processing aid; the coating layer is low-density polyethylene; the inner film is composed of 34 wt% of high density polyethylene, 34 wt% of metallocene polyethylene, 18% of binder resin and 14% of ethylene-vinyl alcohol polymer.
Preferably, the total thickness of the sheet is 232-: 1: 5.7.
preferably, the total thickness of the sheet is 248 μm, wherein the thickness of the surface film and the inner film is 114 μm, and the thickness of the coating layer is 20 μm.
Preferably, in the pellicle, the high-density polyethylene is Saebick company brand B4460AB high-density polyethylene, and the metallocene polyethylene is Exxon company brand 3505MC and Japan Tri-well brand SP1520 metallocene polyethylene; in the coating layer, the low-density polyethylene is Dow chemical brand 722S low-density polyethylene; in the inner film, the high-density polyethylene is Saibek's company brand B4460AB high-density polyethylene, the metallocene polyethylene is Exxon's company brand 3505MC and Japan Tri-well brand SP1520 polyethylene, the adhesive resin is DuPont's brand 41E762 adhesive resin, and the ethylene-vinyl alcohol polymer is Japanese synthetic chemical brand ET3803RB ethylene-vinyl alcohol polymer.
Preferably, the white color master batch is UF880M color master batch of Dainippon ink chemical company, and the processing aid is 10991-K color matching company.
Preferably, the surface film is a three-layer co-extruded film, and the three-layer co-extruded film comprises the following components from outside to inside:
the first layer consists of 70-90 wt% of a designation 3505MC metallocene polyethylene and 10-30 wt% of a designation SP1520 metallocene polyethylene;
the second layer is composed of 80 wt% of brand B4460AB high density polyethylene and 20 wt% of brand UF880M color master batch;
the third layer consists of 70-90 wt% of a designation 3505MC metallocene polyethylene and 10-30 wt% of a designation SP1520 metallocene polyethylene;
preferably, in the pellicle, the thickness ratio of the first layer to the third layer is 1: 4: 1.
preferably, the inner film is a seven-layer co-extruded film, and the seven-layer co-extruded film comprises the following components from outside to inside (i.e. from the side attached with the coating layer to the inner surface of the sheet):
the first layer, the outer layer, is composed of 70-90 wt% of a designation 3505MC metallocene polyethylene and 10-30 wt% of a designation SP1520 metallocene polyethylene;
the second, secondary outer layer, comprised of 100 wt% grade B4460AB high density polyethylene;
the third layer, the first adhesive layer, is composed of 100 wt% of 41E762 adhesive resin;
the fourth, intermediate layer, was comprised of 100 wt% grade ET3803RB ethylene vinyl alcohol polymer;
the fifth layer is the second adhesive layer and consists of 100 wt% of 41E762 adhesive resin;
a sixth, secondary inner layer, comprised of 100 wt% grade B4460AB high density polyethylene;
the seventh, inner layer, is comprised of 70-90 wt% brand 3505MC metallocene polyethylene and 10-30 wt% brand SP1520 metallocene polyethylene.
Preferably, in the inner film, the thickness ratio of the first layer to the seventh layer is 2: 2: 1: 1.5: 1: 2: 2.
the second purpose of the invention is to provide a method for producing the all-plastic composite toothpaste tube sheet suitable for recycling, which comprises the following steps:
s1, preparing raw materials of each layer in a surface film according to a proportion, putting the raw materials into a mixer, uniformly mixing, then feeding the raw materials into an extruder for melting, and co-extruding and blowing the film by the extruder according to the arrangement sequence of the first layer to the third layer to obtain the surface film;
s2, referring to the method of S1, co-extruding and film blowing by using an extruder according to the arrangement sequence of the first layer to the seventh layer to prepare an inner film;
and S3, preparing a coating layer by using an extrusion coating process, and combining the surface film and the inner film together by using the coating layer, wherein the third layer of the surface film is attached to the first layer of the inner film through the coating layer to obtain the required all-plastic composite toothpaste tube sheet.
Preferably, the method further includes step S4, specifically, performing corona treatment on the surface of the first layer of the processed sheet surface film, and facilitating subsequent printing of the corona-treated sheet.
Preferably, the extrusion capacity of the extruder in the step S1 is 480 +/-20 kg/h, the drawing speed is 22 +/-5 m/min, and a 100-mesh 150-mesh filter screen is arranged at the outlet of the extruder; the extrusion capacity of the extruder in the step S2 is 500 +/-20 kg/h, the traction speed is 25 +/-5 m/min, and a 100-mesh 150-mesh filter screen is arranged at the outlet of the extruder; the extrusion capacity of the extruder in the step S3 is 100 +/-20 kg/h, and the traction speed is 110 +/-10 m/min.
Preferably, the filter screen is provided with three layers which are respectively 100 meshes, 150 meshes and 100 meshes.
The invention has the beneficial effects that:
1) the thickness of each layer in the surface film of the sheet adopts 1: 4: 1, the matching processing of the raw materials and the equipment screw is facilitated. According to the formula, the first layer in the surface film has higher surface gloss, good toughness and excellent heat seal strength; the second layer has good stiffness and rigidity, the heat-seal strength of the third layer is high, the second layer is consistent with the first layer, and the second layer can also form good bonding strength with the low-density polyethylene used by the second layer.
The coating layer uses the Dow chemical brand 722S low-density polyethylene, and the raw material has good processing effect and low crystal point index; and secondly, the adhesive can form a good bonding surface with the contact part of the surface film and the inner film used in the application, so that the bonding strength of the outer film and the inner film is ensured.
The outer layer and the inner layer of the inner film are both metallocene polyethylene, so that the heat sealing strength of the sheet material during tube manufacturing can be improved; the inner layer, the outer layer and the secondary inner layer are made of high-density polyethylene, and the stiffness and the forming effect of the sheet during pipe making are improved; the two adhesive layers are adhesive resins, which are helpful for improving the adhesive strength of polyethylene and ethylene-vinyl alcohol polymer (EVOH); the middle layer is ethylene-vinyl alcohol polymer (EVOH), so that the prepared sheet has good barrier properties such as oxygen resistance, moisture resistance and the like.
2) According to the invention, the surface film and the inner film are added with the high-density polyethylene in a certain proportion to form matching, so that the stiffness effect of the composite sheet is improved, and a good forming effect can be formed when the sheet is used for manufacturing a pipe. The inner film is added with a certain proportion of ethylene-vinyl alcohol polymer (EVOH) and is co-extruded with high-density polyethylene to form a film, so that a good barrier effect can be formed, and the aluminum foil material used in the existing product can be well replaced.
3) The surface film is prepared by adopting a three-layer co-extrusion blowing film method, and the inner film is prepared by adopting a seven-layer co-extrusion blowing film method. In the preparation process, the high-mesh filter screen is used, so that the crystal point condition of the film can be effectively improved, and the subsequent printing effect is improved, thereby forming good appearance.
4) The invention adopts an extrusion coating processing mode without an adhesive to combine the surface film and the inner film, can effectively improve the combination strength of the surface film and the inner film, and the formed composite sheet belongs to a single material, belongs to the field of recyclable materials and has higher recycling value.
5) The sheet material has good physical performance index, is suitable for high-speed surface printing, has higher label falling impact strength, and can bear certain impact strength. The sheet material of the invention also has higher heat sealing strength, is easy to produce tubes, does not have the bad problems of knife sticking and the like in production, and can improve the processing speed and the production safety. In addition, the sheet material has good barrier property, can effectively protect package contents, and is beneficial to long-time storage of products.
6) The product has a reasonable layer thickness ratio structure, is optimized in production process by special raw material matching and matching, is applied to product packaging, can improve the appearance visual effect of the product, and can widen the application range of polyethylene film products in packaging. The sheet material of the invention meets the food sanitation and safety standard, and not only can be used for daily chemical packaging, but also can be widely applied to the fields of food packaging and the like.
Drawings
FIG. 1 is a schematic structural view of a high-barrier co-extruded film provided by the invention.
The notations in the figures have the following meanings:
10-pellicle 11-first layer 12-second layer 13-third layer
20-coat layer
30-inner film 31-outer layer 32-second outer layer 33-first adhesive layer 34-middle layer
35-second adhesive layer 36-sublayer 37-inner layer
Detailed Description
The technical solutions of the present invention are described below with reference to the drawings and examples of the specification so as to facilitate understanding for those skilled in the art.
Example 1
As shown in figure 1, the total thickness of the all-plastic composite toothpaste tube sheet suitable for recycling is 232-: 1: 5.7.
The top film 10 was composed of 52.8 wt% high density polyethylene, 30.6 wt% metallocene polyethylene, 13.2 wt% white color masterbatch and 3.4 wt% processing aid. Wherein the high-density polyethylene is Saebick company brand B4460AB high-density polyethylene, the metallocene polyethylene is Exxon company brand 3505MC and Japan three-well brand SP1520 metallocene polyethylene, the white color master batch is big Japan ink chemical company brand UF880M color master batch, and the processing aid is an Anmo color company brand 10991-K processing aid.
The coating layer 20 is 100 wt% dow chemical grade 722S low density polyethylene;
the inner film 30 is composed of 34% by weight of high density polyethylene, 34% by weight of metallocene polyethylene, 18% of a binder resin, and 14% of an ethylene-vinyl alcohol polymer. Wherein the high density polyethylene is Saebick company brand B4460AB high density polyethylene, the metallocene polyethylene is Exxon company brand 3505MC and Japan Tri-well brand SP1520 polyethylene, the adhesive resin is DuPont brand 41E762 adhesive resin, and the ethylene-vinyl alcohol polymer is Japanese synthetic chemical brand ET3803RB ethylene-vinyl alcohol polymer.
On the basis, the surface film 10 is a three-layer co-extrusion film, the total thickness of the surface film 10 is 107-121 μm, and the thickness ratio of the first layer 11, the second layer 12 and the third layer 13 is 1: 4: 1. the three-layer co-extruded film comprises the following components from outside to inside:
the first layer 11 consists of 70-90 wt% of a designation 3505MC metallocene polyethylene and 10-30 wt% of a designation SP1520 metallocene polyethylene;
the second layer 12 is composed of 80 wt% brand B4460AB high density polyethylene and 20 wt% brand UF880M color concentrate;
the third layer 12 consists of 70-90 wt% brand 3505MC metallocene polyethylene and 10-30 wt% brand SP1520 metallocene polyethylene;
the inner film 30 is a seven-layer co-extruded film, the total thickness of the inner film 30 is 107-121 mu m, and the thickness ratio from the outer layer 31 to the inner layer 37 is 2: 2: 1: 1.5: 1: 2: 2. the seven-layer co-extruded film comprises the following components from outside to inside:
the first, outer layer 31, consists of 70-90 wt% of a designation 3505MC metallocene polyethylene and 10-30 wt% of a designation SP1520 metallocene polyethylene;
a second, secondary outer layer 32, comprised of 100 wt% grade B4460AB high density polyethylene;
a third layer, the first adhesive layer 33, consisting of 100 wt% of a 41E762 brand adhesive resin;
the fourth, intermediate layer 34, is comprised of 100 wt% of a grade ET3803RB ethylene vinyl alcohol polymer;
a fifth layer, second adhesive layer 35, comprised of 100 wt% grade 41E762 adhesive resin;
a sixth, secondary inner layer 36 comprised of 100 wt% high density polyethylene having the designation B4460 AB;
the seventh layer, inner layer 37, is comprised of 70-90 wt% brand 3505MC metallocene polyethylene and 10-30 wt% brand SP1520 metallocene polyethylene.
Example 2
The method for producing the all-plastic composite toothpaste tube sheet suitable for recycling in the embodiment 1 comprises the following steps:
s1, preparing raw materials of each layer in the surface film 10 according to a proportion, putting the raw materials into a mixer, uniformly mixing, then feeding the raw materials into an extruder for melting, and performing co-extrusion film blowing by using the extruder according to the arrangement sequence of the first layer 11, the second layer 12 and the third layer 13 to obtain the surface film 10.
In the process, the diameters of the screws of the extruder are 90mm, 100mm and 90mm, and the diameter of the die head is 50 mm; the temperature settings of the extruder are as follows in table 1:
the raw materials of each layer are extruded at high temperature by an extruder to form a melt, and then pass through a filter screen, wherein the filter screen consists of three layers of 100 meshes, 150 meshes and 100 meshes. And then forming an annular bubble cylinder film through a die head distributor, cooling and shaping the bubble cylinder film in an air cooling device, and forming a three-layer co-extruded surface film 10 under the action of a traction device, a thickness measuring system, a corona treatment system, a trimming and a winding device.
Wherein the extrusion capacity of the extruder is 480 +/-20 kg/h; the film traction speed is 22 +/-5 m/min; the traction tension is 150 +/-20N; the tension of the contact roller is 130 +/-20N; the winding tension is 130 +/-10N.
S2, referring to the method of S1, preparing raw materials of each layer in the inner film 30 according to the proportion, putting the raw materials into a mixer, uniformly mixing, then feeding the raw materials into an extruder for melting, and preparing the inner film 30 by co-extruding and film blowing by using the extruder according to the arrangement sequence from the outer layer 31 to the inner layer 37;
in the process, the diameters of the screws of the extruder are 90mm, 100mm and 90mm, and the diameter of the die head is 50 mm; the temperature settings of the extruder are as follows in table 2:
the raw materials of each layer are extruded at high temperature by an extruder to form a melt, and then pass through a filter screen, wherein the filter screen consists of three layers of 100 meshes, 150 meshes and 100 meshes. And then forming an annular bubble cylinder film through a die head distributor, cooling and shaping the bubble cylinder film in an air cooling device, and forming a three-layer co-extruded inner film 30 under the action of a traction device, a thickness measuring system, a corona treatment system, a trimming and a winding device.
Wherein the extrusion capacity of the extruder is 500 plus or minus 20 kg/h; the film traction speed is 25 +/-5 m/min; the traction tension is 200 plus or minus 20N; the tension of the contact roller is 200 +/-10N; the winding tension is 200 +/-20N.
S3, preparing a coating layer 20 by using an extrusion coating process, and combining the surface film 10 and the inner film 30 together by using the coating layer 20, wherein the third layer 13 of the surface film 10 is attached to the outer layer 31 of the inner film 30 through the coating layer 20 to obtain the required all-plastic composite toothpaste tube sheet.
In the process, two extruders are arranged, the diameters of the screws of the extruders are 90mm and 120mm respectively, and the width of the die head is 1300 mm.
The temperature of the extruder is set to 150 ℃, 250 ℃, 270 ℃, 290 ℃, 309 ℃ and 320 ℃ and 335 ℃ in sequence; wherein the temperature of a flange area is 335 ℃, the temperature of a screen changing area is 335 ℃, and the temperature of a die neck is 330 ℃; the nipple temperature was 330 ℃ and the die zone temperature was 335 ℃.
The raw material of the coating layer 20 is extruded at high temperature by an extruder to form a melt, and then passes through a filter screen which consists of three layers of 100 meshes, 150 meshes and 100 meshes. And forming a thin film through a die head, attaching the thin film to the surface film 10 and the inner film 30, cooling and shaping the thin film in a cooling roller device, and forming the all-plastic composite toothpaste tube sheet under the action of a traction device, a trimming device and a winding device.
Wherein the extrusion capacity of the extruder is 100 plus or minus 20 kg/h; the traction speed of the coating film is 110 +/-10 m/min; the traction tension is 80 plus or minus 10N; the tension of the contact roller is 80 +/-10N; the winding tension is 90 +/-10N; the unreeling tension of the surface film and the inner film material is 80N +/-10N.
And S4, performing corona treatment on the surface of the first layer 11 of the processed sheet surface film 10, wherein the sheet subjected to corona treatment is convenient for subsequent printing and other processes.
Example 3
The composite sheet prepared by the invention is marked as an experimental group 1-3, and the composite sheet inner film 30 composition structure is adjusted to be used as a comparison group 1, 2 for performance test.
The compositional data for the experimental groups 1-3 and the comparative groups 1, 2 are shown in Table 3 below, where the numbers are mass fractions.
The five groups of sheets are subjected to main physical property index detection, and the results are shown in the following table 4:
as can be seen from Table 4, the tensile strength of the composite sheet increases with the proportion of metallocene polyethylene, and the heat sealability of the resulting composite sheet also increases. According to the experimental group and the comparative group, the falling mark impact strength is improved to a certain extent along with the adjustment of the formula of the composite sheet, and the oxygen permeation and moisture permeation amount of the composite sheet is greatly reduced in 24h due to the addition of the high-density polyethylene and the adhesive resin in the experimental group, which shows that the moisture resistance and the oxygen resistance of the composite sheet are obviously improved. On the whole, the packaging performance of each group of the composite sheets is superior to that of the comparative group, which shows that the composite sheets provided by the invention have wider applicability.
The above is only a preferred embodiment of the invention, and is not intended to limit the invention; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The all-plastic composite toothpaste tube sheet suitable for recycling is characterized by comprising a surface film (10), a coating layer (20) and an inner film (30) from outside to inside in sequence, wherein the surface film (10) consists of 52.8 wt% of high-density polyethylene, 30.6 wt% of metallocene polyethylene, 13.2 wt% of white color master batch and 3.4 wt% of processing aid; the coating layer (20) is low density polyethylene; the inner film (30) is composed of 34 wt% of high density polyethylene, 34 wt% of metallocene polyethylene, 18% of a binder resin and 14% of an ethylene-vinyl alcohol polymer.
2. The all-plastic composite toothpaste tube sheet suitable for recycling according to claim 1, wherein the total thickness of the sheet is 232-: 1: 5.7.
3. an all plastic composite toothpaste tube sheet suitable for recycling according to claim 1 or 2, wherein in the pellicle (10), the high density polyethylene is Saebick brand B4460AB high density polyethylene, the metallocene polyethylene is Exxon brand 3505MC and Japan Tri-well brand SP1520 metallocene polyethylene; in the coating layer (20), the low-density polyethylene is low-density polyethylene with the Dow chemical brand number of 722S; in the inner film (30), the high-density polyethylene is Saibek brand B4460AB high-density polyethylene, the metallocene polyethylene is Exxon brand 3505MC and Japan Tri-well brand SP1520 polyethylene, the adhesive resin is DuPont brand 41E762 adhesive resin, and the ethylene-vinyl alcohol polymer is Japanese synthetic chemical brand ET3803RB ethylene-vinyl alcohol polymer; the white color master batch is UF880M color master batch of a large Japanese ink chemical company, and the processing aid is 10991-K processing aid of an Achrome company.
4. A full plastic composite toothpaste tube sheet suitable for recycling according to claim 3 wherein said skin (10) is a three layer coextruded film having from the outside to the inside composition:
the first layer (11) consists of 70-90 wt% of a designation 3505MC metallocene polyethylene and 10-30 wt% of a designation SP1520 metallocene polyethylene;
the second layer (12) consists of 80 wt% brand B4460AB high density polyethylene and 20 wt% brand UF880M masterbatch;
the third layer (13) consists of 70-90 wt% of a designation 3505MC metallocene polyethylene and 10-30 wt% of a designation SP1520 metallocene polyethylene.
5. An all plastic composite toothpaste tube sheet suitable for recycling according to claim 4, wherein the thickness ratio of the first layer (11), the second layer (12) and the third layer (13) in the pellicle (10) is 1: 4: 1.
6. an all plastic composite toothpaste tube sheet suitable for recycling according to claim 4 wherein the inner film (30) is a seven layer coextruded film having from the outside to the inside composition:
a first or outer layer (31) consisting of 70-90% by weight of a 3505MC metallocene polyethylene and 10-30% by weight of a SP1520 metallocene polyethylene;
a second, secondary outer layer (32) comprised of 100 wt% high density polyethylene having the designation B4460 AB;
a third layer, adhesive layer (33), consisting of 100 wt% of a 41E762 brand adhesive resin;
the fourth, intermediate layer (34), consists of 100 wt% of a grade ET3803RB ethylene vinyl alcohol polymer;
a fifth layer, adhesive layer (35), consisting of 100 wt% of 41E762 adhesive resin;
a sixth, secondary inner layer (36) comprised of 100 wt% high density polyethylene having the designation B4460 AB;
the seventh layer, the inner layer (37), consists of 70-90 wt% of a designation 3505MC metallocene polyethylene and 10-30 wt% of a designation SP1520 metallocene polyethylene.
7. An all plastic composite toothpaste tube sheet suitable for recycling according to claim 6, wherein the thickness ratio of the first layer (31) to the seventh layer (37) of the inner film (30) is 2: 2: 1: 1.5: 1: 2: 2.
8. a method of producing a composite all plastic toothpaste tube sheet material suitable for recycling according to any of claims 4 to 7, comprising the steps of:
s1, preparing raw materials of each layer in a surface film (10) according to a proportion, putting the raw materials into a mixer, uniformly mixing, then feeding the raw materials into an extruder for melting, and performing co-extrusion film blowing by using the extruder according to the arrangement sequence of a first layer (11), a second layer (12) and a third layer (13) in sequence to obtain the surface film (10);
s2, referring to the method of S1, co-extruding and film blowing are carried out by an extruder according to the arrangement sequence of the outer layer (31) to the inner layer (37) to prepare an inner film (30);
s3, preparing a coating layer (20) by using an extrusion coating process, and combining the surface film (10) and the inner film (30) together by using the coating layer (20), wherein the third layer (13) of the surface film (10) is attached to the outer layer (31) of the inner film (30) through the coating layer (20), so that the required all-plastic composite toothpaste tube sheet is obtained.
9. The method for manufacturing an all-plastic composite toothpaste tube sheet material suitable for recycling according to claim 8, further comprising a step S4 of performing corona treatment on the surface of the first layer (11) of the processed sheet material surface film (10).
10. The method for producing an all-plastic composite toothpaste tube sheet material suitable for recycling as claimed in claim 8, wherein the extrusion output of the extruder in the step S1 is 480 ± 20kg/h, the pulling speed is 22 ± 5m/min, and the outlet of the extruder is provided with a 100-mesh 150-mesh filter screen; the extrusion capacity of the extruder in the step S2 is 500 +/-20 kg/h, the traction speed is 25 +/-5 m/min, and a 100-mesh 150-mesh filter screen is arranged at the outlet of the extruder; the extrusion capacity of the extruder in the step S3 is 100 +/-20 kg/h, and the traction speed is 110 +/-10 m/min.
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| CN113291009A (en) * | 2021-04-13 | 2021-08-24 | 永新股份（黄山）包装有限公司 | Recyclable and reusable toothpaste sheet and production process thereof |
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| CN201573373U (en) * | 2009-11-10 | 2010-09-08 | 江阴升辉包装材料有限公司 | Full-plastic multi-layer co-extrusion sheet |
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