CN114654645A - Preparation method of PE regenerated guard plate - Google Patents
Preparation method of PE regenerated guard plate Download PDFInfo
- Publication number
- CN114654645A CN114654645A CN202210375407.7A CN202210375407A CN114654645A CN 114654645 A CN114654645 A CN 114654645A CN 202210375407 A CN202210375407 A CN 202210375407A CN 114654645 A CN114654645 A CN 114654645A
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- Prior art keywords
- layer
- eva
- regenerated
- extrusion
- whole
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Links
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000001125 extrusion Methods 0.000 claims abstract description 35
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 238000013329 compounding Methods 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000008929 regeneration Effects 0.000 claims description 13
- 238000011069 regeneration method Methods 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 5
- 239000004698 Polyethylene Substances 0.000 abstract description 45
- 239000004743 Polypropylene Substances 0.000 abstract description 35
- 239000005038 ethylene vinyl acetate Substances 0.000 abstract description 32
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 abstract description 32
- -1 polyethylene Polymers 0.000 abstract description 7
- 229920000573 polyethylene Polymers 0.000 abstract description 5
- 229920001155 polypropylene Polymers 0.000 abstract description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 abstract 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010030 laminating Methods 0.000 description 3
- 238000000576 coating method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
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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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/28—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/30—Making multilayered or multicoloured articles
- B29C43/305—Making multilayered articles
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
Abstract
The invention discloses a preparation method of a PE (polyethylene) regenerated guard plate, which comprises a PP (polypropylene) layer, a PE-EVA (ethylene-vinyl acetate) mixed layer and a regenerated PE layer from outside to inside in sequence; the preparation method comprises the following steps: firstly, heating the PE-EVA mixing layer to 310-340 ℃, and then spraying the PE-EVA mixing layer on the PP layer to enable the PE-EVA mixing layer and the PP layer to be firstly compounded into a whole; and then compounding the regenerated PE layer and the previously compounded PP layer into a whole by using the temperature of the extrusion end of the regenerated PE under the action of the upper and lower pressure rollers. The invention has the advantages that: because the structure that the PP and the PE are compounded through the PE-EVA mixing layer is adopted, the regenerated PE layer and the previously compounded PP layer are perfectly compounded into a whole under the action of the upper and lower pressure rollers only by depending on the temperature of an extrusion end, the extrusion and compounding are realized, meanwhile, the mechanical performance of the plate is ensured, the recovered PE is utilized, the resources are saved, and the environment is protected.
Description
Technical Field
The invention relates to the technical field of packaging materials, in particular to a guard plate for steel coil packaging.
Background
In the process of transporting the steel coil, the end part, the side edges and other positions of the steel coil need to be coated so as to prevent the surface of the steel coil from being damaged due to the action of external force. Most of the coated clad materials are PE (polyethylene), and most of the clad materials are treated as garbage after being used, so that not only is the resource waste caused, but also the environment is influenced. There are also some cases in the prior art in which these coatings are recycled, but the recycled PE coatings have poor impact resistance and poor toughness, and are not suitable for secondary use as a sheathing board.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a preparation method of a PE regeneration guard plate, wherein the PE regeneration guard plate sequentially comprises a PP layer, a PE-EVA mixing layer and a regeneration PE layer from outside to inside;
the preparation method comprises the following steps: firstly, heating the PE-EVA mixing layer to 310-340 ℃, spraying the PE-EVA mixing layer onto an extrusion roller, cooling the PE-EVA mixing layer to 189-195 ℃ by the extrusion roller, and then carrying out hot melting on the PE-EVA mixing layer and the PP layer on a main roller to form a whole, wherein the surface of the PP layer is just melted at the temperature so as to ensure that the PE-EVA mixing layer and the PP layer are firstly compounded into a whole;
and then compounding the regenerated PE layer and the previously compounded PP layer into a whole by utilizing the temperature of the extrusion end of the regenerated PE under the action of an upper pressure roller and a lower pressure roller.
The thickness of the PE-EVA mixed layer is 0.1-0.12 times of the thickness of the PP layer.
The weight ratio of EVA in the PE-EVA mixed layer is 18-22%, and the rest is PE.
The PE-EVA mixed layer is firstly sprayed on an extrusion roller, then is cooled to 189-195 ℃ by the extrusion roller, and is then integrated with the PP layer on the main roller in a hot melting way.
A buffer layer is arranged in the regenerated PE layer, the buffer layer is made of EPE, and the thickness of the buffer layer is 1-2 mm.
And compounding the buffer layer and the regenerated PE layer into a whole by utilizing the temperature of the extrusion end of the regenerated PE under the action of the upper and lower pressure rollers.
The invention has the advantages that: because the structure that the PP and the PE are compounded through the PE-EVA mixing layer is adopted, the regenerated PE layer and the PP layer which is compounded previously are perfectly compounded into a whole under the action of the upper and lower pressure rollers only by depending on the temperature of an extrusion end, the extrusion and compounding are realized, meanwhile, the mechanical performance of the plate is ensured, the recovered PE is utilized, the resources are saved, and the environment is protected.
Drawings
FIG. 1 is a schematic view of the PE regeneration shield structure according to the present invention;
FIG. 2 is a schematic structural view of a film coating machine;
fig. 3 is a left side view of fig. 2.
Detailed Description
The present invention is specifically described below with reference to the accompanying drawings, and as shown in the drawings, the structure of the PE regenerated protective sheet of the present invention includes, in order from the outside to the inside, a PP (polypropylene) layer 100, a PE (polyethylene) -EVA (ethylene-vinyl acetate copolymer) mixed layer 200, and a regenerated PE (polyethylene) layer 300.
The PP layer adopts raw material PP;
the PE in the PE-EVA mixed layer 2 adopts raw materials, the weight ratio of EVA is 18-22%, and the rest is PE; heating the mixture of the two to 310-340 ℃, and spraying the mixture onto a PP layer;
then the PE-EVA mixed layer and a regenerated PE layer with the extrusion end temperature of 130-150 ℃ are extruded into a whole;
because the PE-EVA mixed layer is used as a key connector for connecting the PP layer and the regenerated PE layer, the thickness of the PE-EVA mixed layer directly influences the composite firmness, namely the performance of the final material; preferably, the thickness of the PE-EVA mixed layer is 0.1-0.12 times of the thickness of the PP layer.
When PP and PE are directly compounded, because the melting point of PP is 189 ℃, the extrusion temperature of regenerated PE is generally 130-150 ℃, and the melting point of PE is 110-115 ℃, the melting point of PP is not reached, and the compounding of PP and PE cannot be ensured; if the extrusion temperature is increased, PE cannot be ensured to be plate-shaped, and extrusion and compounding cannot be realized simultaneously; therefore, a PE-EVA mixing layer is arranged as an intermediate layer, the PE-EVA mixing layer is heated to 310-340 ℃ and then sprayed onto a PP layer, so that the PE-EVA mixing layer and the PP layer are compounded into a whole; then, the PE-EVA layer is utilized to have a lower melting point, generally only about 99 ℃, so that the temperature of the extrusion end of the regenerated PE reaches the melting point temperature, and finally, the regenerated PE layer and the PP layer which is compounded previously are perfectly compounded into a whole under the action of an upper pressure roller and a lower pressure roller only by depending on the temperature of the extrusion end. Because the PE-EVA layer is heated to about 310-340 ℃, in order to prevent the PP layer from being melted during dripping, the PE-EVA mixed layer is firstly sprayed onto an extrusion roller, then is cooled to 189-195 ℃ by the extrusion roller and then is melted with the PP layer on the main roller into a whole, and the surface of the PP layer is just melted at the temperature so as to ensure that the PE-EVA layer and the PP layer are melted into a whole under extrusion.
The indexes of the composite board such as strength and the like completely meet the technical requirements of covering materials, and the recycling of waste materials is realized.
In order to ensure that the PE regeneration guard plate has a buffering effect, a buffer layer 400 is arranged in the regeneration PE layer, the buffer layer is made of EPE (polyethylene foam plastics) and is 1-2mm thick.
As mentioned above, in order to achieve the combination while extruding, the buffer layer is also directly combined under the action of the squeeze roll by using the extrusion temperature.
The film laminating machine used by the invention is designed by self, the structure of the film laminating machine is shown in figures 2-3, the film laminating machine comprises a frame 1, one end of the frame is provided with a film placing roller 2, a PP film 16 on the film placing roller bypasses a main roller 4 after passing through a plurality of guide rollers 17, and then returns to a film collecting roller 3 after passing through the guide rollers; the main roller corresponds to the extrusion roller 5, a rotating shaft of the extrusion roller 5 is arranged on a longitudinal sliding block 6, the longitudinal sliding block is arranged in a longitudinal slideway 7, and the lower part of the longitudinal sliding block is abutted against a piston of a longitudinal hydraulic cylinder 8; the longitudinal slide way is arranged on a horizontal slide block 9, the lower part of the horizontal slide block is arranged on a horizontal slide way 10, and the horizontal slide block is connected with the piston end of a horizontal hydraulic cylinder 11; the arrangement of the horizontal hydraulic cylinder and the longitudinal hydraulic cylinder ensures the adjustment of the squeeze roll in the horizontal and vertical directions so as to adapt to the requirement of the change of the film thickness.
The main roller and the extrusion roller are water-cooled rollers, and the roller body is hollow and is connected with the water tank through a rotary joint, a water pipe 13 and a water pump; a heating element and a temperature sensor are arranged in the water tank; the heating element and the temperature sensor are both connected with the control center 15; the temperature of water in the water tank can be known through the inductor, and then the temperature regulation of the roller body is realized through the heating element.
A spraying device 14 is arranged above the extrusion of the main roller and the extrusion roller, and a spraying head 142 of the spraying device deflects to the extrusion roller;
the spraying device comprises a T-shaped beam, a nut seat 144 is arranged below the T-shaped beam, a screw 145 is rotatably arranged in the nut seat, and one end of the screw is connected with an output shaft of a motor 146; the upper end of the T-shaped beam is a sliding seat 147 which can slide along a cross beam 148; the motor drives the screw rod to rotate so as to drive the T-shaped beam to slide on the cross beam, the lower part of the T-shaped beam is connected with the storage bin 141, and the spray header is arranged below the storage bin.
The film collecting roller, the main roller, the extrusion roller and the like are all connected with a driving device, a motor of the driving device is connected with a control center, and the driving device is a motor which transmits power to the corresponding roller by utilizing a chain structure or a belt structure or a gear structure, which are all known technologies and are not described herein again.
The extrusion compounding device of the present invention can adopt common equipment, such as a PE plate extruder produced by Tazhou Ming Jiada rubber and plastic machinery limited company.
Claims (6)
1. A preparation method of a PE regenerated guard plate is characterized by comprising the following steps: the PE regeneration protective plate is sequentially provided with a PP layer, a PE-EVA mixing layer and a regeneration PE layer from outside to inside;
the preparation method comprises the following steps: firstly, heating the PE-EVA mixing layer to 310-340 ℃, spraying the PE-EVA mixing layer onto an extrusion roller, cooling the PE-EVA mixing layer to 189-195 ℃ by the extrusion roller, and then carrying out hot melting on the PE-EVA mixing layer and the PP layer on a main roller to form a whole, wherein the surface of the PP layer is just melted at the temperature so as to ensure that the PE-EVA mixing layer and the PP layer are firstly compounded into a whole;
and then compounding the regenerated PE layer and the previously compounded PP layer into a whole by using the temperature of the extrusion end of the regenerated PE under the action of the upper and lower pressure rollers.
2. The method for producing a PE regeneration shield according to claim 1, characterized in that: the thickness of the PE-EVA mixed layer is 0.1-0.12 times of the thickness of the PP layer.
3. The method for producing a PE regeneration shield according to claim 1, characterized in that: the weight ratio of EVA in the PE-EVA mixed layer is 18-22%, and the rest is PE.
4. The method for producing a PE regeneration shield according to claim 1, characterized in that: the PE-EVA mixing layer is firstly sprayed on an extrusion roller, then cooled to 189-195 ℃ by the extrusion roller, and then integrated with the PP layer on the main roller in a hot melting way.
5. The method for producing a PE regeneration shield according to claim 1, characterized in that: a buffer layer is arranged in the regenerated PE layer, the buffer layer is made of EPE, and the thickness of the buffer layer is 1-2 mm.
6. The method for producing a PE regeneration shield according to claim 5, wherein: and compounding the buffer layer and the regenerated PE layer into a whole by utilizing the temperature of the extrusion end of the regenerated PE under the action of the upper and lower pressure rollers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210375407.7A CN114654645A (en) | 2022-04-11 | 2022-04-11 | Preparation method of PE regenerated guard plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210375407.7A CN114654645A (en) | 2022-04-11 | 2022-04-11 | Preparation method of PE regenerated guard plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114654645A true CN114654645A (en) | 2022-06-24 |
Family
ID=82036202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210375407.7A Pending CN114654645A (en) | 2022-04-11 | 2022-04-11 | Preparation method of PE regenerated guard plate |
Country Status (1)
| Country | Link |
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| CN (1) | CN114654645A (en) |
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