CN113306178A - Process for manufacturing turnover box by using waste EVA (ethylene vinyl acetate copolymer) - Google Patents
Process for manufacturing turnover box by using waste EVA (ethylene vinyl acetate copolymer) Download PDFInfo
- Publication number
- CN113306178A CN113306178A CN202110565743.3A CN202110565743A CN113306178A CN 113306178 A CN113306178 A CN 113306178A CN 202110565743 A CN202110565743 A CN 202110565743A CN 113306178 A CN113306178 A CN 113306178A
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- China
- Prior art keywords
- particles
- eva
- temperature
- waste
- turnover box
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
- B29D22/003—Containers for packaging, storing or transporting, e.g. bottles, jars, cans, barrels, tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/08—Copolymers of ethylene
- B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses a process for manufacturing a turnover box by using waste EVA (ethylene vinyl acetate), which comprises the following steps of: respectively crushing propylene composite material plastic film paper and waste EVA into particles; step two, stirring and mixing the crushed propylene composite material particles with the weight percentage of 60-70% and the waste EVA particles with the weight percentage of 30-40% with the waste EVA; step three, adding the mixture into the double-screw extruder, controlling the plasticizing temperature of a main machine of the double-screw extruder at 350-370 ℃, and controlling the plasticizing time at 1-3min, so that the low-temperature EVA particles and the high-temperature PET particles are melted and mixed together; step four, cooling the plasticized particles, and cooling the product to 140-150 ℃; step five, controlling the temperature of a compression roller of the double-screw extruder at 190 ℃, and pressing the product into a sheet-shaped plate; and step six, folding the box body into a box body shape, and connecting the four side edge columns through rivets. The invention can utilize waste EVA to form a turnover box, thereby reducing environmental pollution.
Description
Technical Field
The invention relates to a process for manufacturing a turnover box by using waste EVA.
Background
Solar photovoltaic systems refer to facilities that convert solar energy into direct current electrical energy using the photovoltaic effect of photovoltaic semiconductor materials. The core of photovoltaics is the solar panel. In recent years, the application of renewable energy sources is actively promoted, and the development of the photovoltaic industry is very rapid. The installation of present solar cell panel does: EVA, battery piece, backplate, glass, from supreme pressfitting down, the EVA below can spill over to all around in the pressfitting process, and the EVA that spills over to all around needs to be cut out, forms waste product EVA. And the waste EVA can not be directly discharged, if the waste EVA is burned, the waste EVA cannot meet the environmental protection problem, if the waste EVA is directly buried, the soil quality cannot be solved, and the waste EVA cannot meet the standard.
Waste EVA contains a mixture of low-temperature EVA particles and high-temperature PET particles, the melting point of the low-temperature EVA particles is 130 ℃, and the melting temperature of the PET particles is 260 degrees, so that the low-temperature EVA particles and the PET particles cannot be separated and sold at present; the direct discarding of the waste EVA film will cause environmental problems, and therefore, the waste EVA film after the solar cell panel is cut is a problem that needs to be solved at present.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the process for manufacturing the turnover box by using waste EVA, which can form the turnover box by using the waste EVA and reduce the environmental pollution.
In order to achieve the above purposes, the invention adopts the technical scheme that: a process for manufacturing a turnover box by using waste EVA comprises the following steps: respectively crushing propylene composite material plastic film paper and waste EVA into particles; step two, stirring and mixing the crushed propylene composite material particles with the weight percentage of 60-70% and the waste EVA particles with the weight percentage of 30-40% with the waste EVA; step three, adding the mixture into a double-screw extruder, controlling the plasticizing temperature of a main machine of the double-screw extruder at 350-370 ℃, the plasticizing temperature at 360 ℃, the plasticizing time at 1-3min, and the optimal temperature duration at 2min, so that the low-temperature EVA particles and the high-temperature PET particles are melted and mixed together; step four, cooling the plasticized particles, and cooling the product to 140-150 ℃; step five, controlling the temperature of a compression roller of the double-screw extruder at 190 ℃ and 160 ℃, and pressing the product into a sheet-shaped plate; sixthly, folding the box body into a box shape, connecting the four prisms through rivets, and forming handle holes.
The process for manufacturing the turnover box by using the waste EVA has the advantages that the leftover waste materials in photovoltaic production are recycled and used for manufacturing the turnover box, the waste EVA is not buried or burnt any more, the environment is protected, the problem that the photovoltaic waste EVA cannot be treated at present is solved, all edges of the box body are connected by rivets, the turnover box made of the material has the supporting strength equivalent to that of other materials, the turnover box made of the material has better supporting strength, structures for mounting supporting frames at the edges of the turnover box at present can be cancelled, rivets can be directly riveted, and the material is used as the turnover box and is lower in cost.
Preferably, a toughening agent is added in the second step, and the weight percentage is 2-4%, so that the formed turnover box has better flexibility.
Preferably, the upper knife and the lower knife of the bending machine are arranged up and down and staggered, the upper knife is matched with the temperature of 230 ℃, the lower knife is matched with the temperature of 120 ℃, and the lower knife upwards presses and bends the sheet-shaped plate to form a box body shape. The temperature setting value of the upper cutter is about twice higher than that of the lower cutter, so that the sheet-shaped plate made of the material is better bent, the temperature of the upper cutter is set to be 230 ℃, the temperature of the lower cutter is set to be 120 ℃, and the temperature is suitable for bending the sheet-shaped plate made of the medium material.
Preferably, the folding step is to form a folding groove and a folding line on the sheet-shaped plate, and turn over the plate manually in the later stage. After bending, the strength is low compared with a bending machine mode.
Preferably, the cooling is performed by using a copper pipe, circulating water for cooling is introduced into the copper pipe, and the cooling is performed continuously by using the circulating water.
Preferably, the plasticized granules are cooled in water at 60 ℃.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
Example one
The process for manufacturing the turnover box by using the waste EVA comprises the following steps: respectively crushing propylene composite material plastic film paper and waste EVA into particles; step two, stirring and mixing the crushed propylene composite material with 65 weight percent and waste EVA with 35 weight percent; step three, adding the mixture into a double-screw extruder, controlling the plasticizing temperature of a main machine of the double-screw extruder at 360 ℃ and controlling the plasticizing time at 2min, so that the low-temperature EVA particles and the high-temperature PET particles are melted and mixed together; step four, cooling the plasticized particles in water at 60 ℃, wherein a copper pipe is adopted for cooling, circulating water for cooling is introduced into the copper pipe, and the product is cooled to 145 ℃; step five, controlling the temperature of a compression roller of the double-screw extruder at 175 ℃, and pressing the product into a sheet-shaped plate; and step six, folding the box body into a box body shape, connecting the four side edge columns through rivets, and forming handle holes.
Wherein, the folding mode of turnover case can adopt mode one: the bending is carried out by adopting a bending machine, an upper cutter and a lower cutter of the bending machine are arranged up and down and are staggered, the upper cutter is matched with the temperature of 230 ℃, the lower cutter is matched with the temperature of 120 ℃, and the lower cutter upwards punches and bends the sheet-shaped plate to form a box body shape.
Example two
The first mode is different from the second mode, the folding mode of the turnover box can adopt a second mode, the folding mode is firstly provided with the folding groove and the bending line on the sheet-shaped plate, the turnover box is manually turned at the later stage, and compared with the turnover box obtained in the first mode, the turnover box is low in strength after being bent.
EXAMPLE III
Different from the first embodiment, the following parameters of the second embodiment are different from those of the first embodiment, in the second step, 60% by weight of the crushed propylene composite material particles and 40% by weight of the waste EVA particles are stirred and mixed; step three, adding the mixture into a double-screw extruder, controlling the plasticizing temperature of a main machine of the double-screw extruder at 350 ℃ and controlling the plasticizing time at 1min, so that the low-temperature EVA particles and the high-temperature PET particles are melted and mixed together; step four, cooling the plasticized particles in water at 60 ℃, wherein a copper pipe is adopted for cooling, circulating water for cooling is introduced into the copper pipe, and the product is cooled to 140 ℃; and step five, controlling the temperature of a compression roller of the double-screw extruder at 150 ℃, and pressing the product into a sheet-shaped plate. The sheet-like plate material processed in this example has a relatively weak supporting strength compared to the sheet-like plate material of the first example.
Example four
Different from the first embodiment, the following parameters of the second embodiment are different from those of the first embodiment, in the second step, 70% by weight of the crushed propylene composite material particles and 30% by weight of the waste EVA particles are stirred and mixed; step three, adding the mixture into a double-screw extruder, controlling the plasticizing temperature of a main machine of the double-screw extruder at 370 ℃ and controlling the plasticizing time at 3 min; step four, cooling the plasticized particles in water at 60 ℃, wherein a copper pipe is adopted for cooling, circulating water for cooling is introduced into the copper pipe, and the product is cooled to 150 ℃; and step five, controlling the temperature of a compression roller of the double-screw extruder at 190 ℃, and pressing the product into a sheet-shaped plate. The sheet-shaped plate processed in this example has a supporting strength that is relatively weaker than that of the sheet-shaped plate of the first example, but is relatively stronger than that of the sheet-shaped plate of the third example.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (6)
1. The process for manufacturing the turnover box by using the waste EVA is characterized by comprising the following steps of:
respectively crushing propylene composite material plastic film paper and waste EVA into particles;
step two, stirring and mixing the crushed propylene composite material particles with the weight percentage of 60-70% and the waste EVA particles with the weight percentage of 30-40% with the waste EVA;
step three, adding the mixture into the double-screw extruder, controlling the plasticizing temperature of a main machine of the double-screw extruder at 350-370 ℃, and controlling the plasticizing time at 1-3min, so that the low-temperature EVA particles and the high-temperature PET particles are melted and mixed together;
step four, cooling the plasticized particles, and cooling the product to 140-150 ℃;
step five, controlling the temperature of a compression roller of the double-screw extruder at 190 ℃, and pressing the product into a sheet-shaped plate;
and step six, folding the box body into a box body shape, connecting the four side edge columns through rivets, and forming handle holes.
2. The process for manufacturing the turnover box by using the waste EVA according to claim 1, wherein the process comprises the following steps: and 2-4% of toughening agent is added in the second step.
3. The process for manufacturing the turnover box by using the waste EVA according to claim 1, wherein the process comprises the following steps: the folding is carried out by adopting a bending machine, an upper cutter and a lower cutter of the bending machine are arranged up and down and staggered, the upper cutter is matched with the temperature of 230 ℃, the lower cutter is matched with the temperature of 120 ℃, and the lower cutter upwards punches and bends the sheet-shaped plate to form a box body shape.
4. The process for manufacturing the turnover box by using the waste EVA according to claim 1, wherein the process comprises the following steps: folding first offers the mark folding groove and the line of bending on the slice panel, turns over through the manual work in the later stage.
5. The process for manufacturing the turnover box by using the waste EVA according to claim 1, wherein the process comprises the following steps: the cooling is performed by adopting a copper pipe, and circulating water for cooling is introduced into the copper pipe.
6. The process for manufacturing the turnover box by using the waste EVA according to claim 1, wherein the process comprises the following steps: the plasticized particles are cooled in water at 60 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110565743.3A CN113306178A (en) | 2021-05-24 | 2021-05-24 | Process for manufacturing turnover box by using waste EVA (ethylene vinyl acetate copolymer) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110565743.3A CN113306178A (en) | 2021-05-24 | 2021-05-24 | Process for manufacturing turnover box by using waste EVA (ethylene vinyl acetate copolymer) |
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|---|---|
| CN113306178A true CN113306178A (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110565743.3A Pending CN113306178A (en) | 2021-05-24 | 2021-05-24 | Process for manufacturing turnover box by using waste EVA (ethylene vinyl acetate copolymer) |
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| Country | Link |
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| CN (1) | CN113306178A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200714638A (en) * | 2005-10-14 | 2007-04-16 | Victory General Technology Co Ltd | The recycling method of EVA waste |
| TW201607975A (en) * | 2014-08-29 | 2016-03-01 | Shiung Fire Cremator Co Ltd | Method of producing eco-friendly electronic boards using recycled plastic waste |
| CN108544692A (en) * | 2018-04-18 | 2018-09-18 | 北京星和众维科技股份有限公司 | A kind of method of recycling luggage leftover bits and pieces and prepared liner plate and application |
-
2021
- 2021-05-24 CN CN202110565743.3A patent/CN113306178A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200714638A (en) * | 2005-10-14 | 2007-04-16 | Victory General Technology Co Ltd | The recycling method of EVA waste |
| TW201607975A (en) * | 2014-08-29 | 2016-03-01 | Shiung Fire Cremator Co Ltd | Method of producing eco-friendly electronic boards using recycled plastic waste |
| CN108544692A (en) * | 2018-04-18 | 2018-09-18 | 北京星和众维科技股份有限公司 | A kind of method of recycling luggage leftover bits and pieces and prepared liner plate and application |
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