CN116277707A - Preparation method of thermoplastic plastic product - Google Patents
Preparation method of thermoplastic plastic product Download PDFInfo
- Publication number
- CN116277707A CN116277707A CN202211652037.3A CN202211652037A CN116277707A CN 116277707 A CN116277707 A CN 116277707A CN 202211652037 A CN202211652037 A CN 202211652037A CN 116277707 A CN116277707 A CN 116277707A
- Authority
- CN
- China
- Prior art keywords
- thermoplastic
- blank
- plastic
- die
- thermoplastic plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 100
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 42
- 239000004033 plastic Substances 0.000 claims abstract description 35
- 229920003023 plastic Polymers 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000003892 spreading Methods 0.000 claims abstract description 14
- 230000007480 spreading Effects 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000001746 injection moulding Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 10
- -1 Polyethylene Polymers 0.000 claims abstract description 9
- 239000004698 Polyethylene Substances 0.000 claims abstract description 8
- 229920000573 polyethylene Polymers 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 239000004743 Polypropylene Substances 0.000 claims abstract description 4
- 239000004793 Polystyrene Substances 0.000 claims abstract description 4
- 229920001155 polypropylene Polymers 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000009966 trimming Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 4
- 230000003749 cleanliness Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 238000007373 indentation Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 125000006615 aromatic heterocyclic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C2045/0096—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor drying the moulding material before injection, e.g. by heating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention provides a preparation method of a thermoplastic plastic product, which comprises the following steps: s1, material selection preparation: selecting thermoplastic raw materials, mainly Polyethylene (PE), polypropylene (PVC) and Polystyrene (PS), and then treating the thermoplastic raw materials; s2, preheating a blank: placing the treated thermoplastic raw material in a heating furnace for preheating treatment, so that the thermoplastic raw material is melted into a liquid state; s3, manual spreading: manually spreading the thermoplastic plastic blank melted into a liquid state by an operator; according to the invention, the plastic is crushed into fine powder, after the thermoplastic plastic blank is melted, the plastic blank can be conveyed through the injection molding machine, and is added into the mold for molding, so that the glossiness of the surface of a plastic finished product is reduced, the phenomenon of agglomeration of the surface of the finished product caused by the particle shape of the thermoplastic plastic raw material is reduced, and the quality of the finished product is improved.
Description
Technical Field
The invention belongs to the field of thermoplastic plastic products, and particularly relates to a preparation method of a thermoplastic plastic product.
Background
Thermoplastics are a class of plastics which have plasticity at a certain temperature, solidify after cooling and are capable of repeating this process. The molecular structure is characterized in that the linear high molecular compound is generally provided with no active group, and linear intermolecular crosslinking does not occur when heated. The waste products can be reprocessed into new products after being recovered, and the main varieties include polyolefin (vinyl, olefin, styrene, acrylic ester, fluorine-containing alkene, etc.), cellulose, polyether polyester, aromatic heterocyclic polymer, etc.;
at present, after thermoplastic plastic products in the market are melted and added into a mould for forming, the plastic products after forming are easy to generate phenomena of bubbles, silver wires and the like, and as the internal moisture of thermoplastic plastic blanks is excessive before forming, the thermoplastic plastic blanks are gasified at high temperature during forming in the mould, the plastic is promoted to be hydrolyzed, and meanwhile, the surface of the formed plastic products is agglomerated due to insufficient crushing of plastic raw materials, so that the quality of finished products is influenced!
In summary, the present invention provides a method for preparing a thermoplastic plastic product to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method of a thermoplastic plastic product, which aims to solve the problems that in the prior art, after a thermoplastic plastic product in the market is melted, the thermoplastic plastic product is added into a mould for forming, and the phenomena of bubbles, silver wires and the like are easy to occur in the plastic product after the forming.
A method of making a thermoplastic article comprising the steps of:
s1, material selection preparation: selecting thermoplastic raw materials, mainly Polyethylene (PE), polypropylene (PVC) and Polystyrene (PS), and then treating the thermoplastic raw materials;
s2, preheating a blank: placing the treated thermoplastic raw material in a heating furnace for preheating treatment, so that the thermoplastic raw material is melted into a liquid state;
s3, manual spreading: manually spreading the thermoplastic plastic blank melted into a liquid state by an operator;
s4, automatic spreading: an operator uses an injection molding machine to spread the thermoplastic plastic blank melted into a liquid state;
s5, forming a die: drying the thermoplastic plastic blank melted into liquid state before the blank is filled into a mould, extruding the blank into the mould, and then closing the mould, wherein the temperature is controlled to be 170-210 ℃;
s6, heat preservation and pressure maintaining: continuously maintaining the temperature and pressure of the blank after the blank is loaded into the die;
s7, opening the die and stripping: after the thermoplastic plastic blank is molded in the mold, opening the mold, and taking out the plastic part;
s8, die cleaning: after the plastic part is taken out, cleaning the inner wall of a die cavity of the die;
s9, the next cycle: a molding step of reciprocally circulating the plastic part;
s10, trimming: carrying out edge trimming on the molded product of the plastic part taken out of the die, so as to avoid the influence of edge burrs on the overall quality of the finished product;
s11, detecting a finished product: softness and surface cleanliness were tested on the molded thermoplastic parts.
Preferably, the preparing of the material in S1 includes: weighing, cutting and comminuting, wherein the thermoplastic weighing device is a primary electronic scale.
Preferably, the pulverizing process in the step S1 adopts a thermoplastic plastic micronizer, wherein the pulverizing fineness of the thermoplastic plastic micronizer ranges from 25 μm to 120 μm.
Preferably, in the step S2, the thermoplastic is melted fully by heating and stirring the thermoplastic blank.
Preferably, the automatic spreading in the step S4 is carried out by adopting a screw of an injection molding machine, and the amount of the thermoplastic plastic blank can be metered in real time.
Preferably, the thermoplastic blank is dried by a hopper dryer before the S5 die is formed, and the moisture in the thermoplastic blank is controlled to be between 0.05 and 0.02 percent.
Preferably, the steps S8 and S10 are performed simultaneously, and in addition, the surface of the male die and the surface of the female die in the die are cleaned by adopting a fiber brush in the step S8.
Preferably, the trimming in the step S10 is mainly performed by using a BD-1010B burr machine, and the processing amount of the BD-1010B burr machine is 10-20 kg each time.
Preferably, the softness test in S11 is performed using a plastic ball indentation hardness tester.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the plastic is crushed into fine powder, after the thermoplastic plastic blank is melted, the plastic blank can be conveyed through the injection molding machine, and is added into the mold for molding, so that the glossiness of the surface of a plastic finished product is reduced, the phenomenon of agglomeration of the surface of the finished product caused by the particle shape of the thermoplastic plastic raw material is reduced, and the quality of the finished product is improved.
2. According to the invention, before the thermoplastic plastic blank is added into the die, the thermoplastic plastic blank is subjected to drying treatment on the internal moisture through the hopper type dryer, so that the moisture in the thermoplastic plastic blank is controlled to be between 0.05% and 0.02%, the frequency of bubbles on the surface of a formed plastic product is reduced, and meanwhile, the smooth proceeding of the thermoplastic plastic product and the quality of plastic parts are ensured.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic diagram of a material selection preparation flow of the invention;
FIG. 3 is a schematic diagram of a moisture drying process according to the present invention.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
As shown in fig. 1-3, the present invention provides a method for preparing a thermoplastic article, comprising the steps of:
s1, material selection preparation: selecting thermoplastic raw materials, mainly Polyethylene (PE), polypropylene (PVC) and Polystyrene (PS), and then treating the thermoplastic raw materials;
s2, preheating a blank: placing the treated thermoplastic raw material in a heating furnace for preheating treatment, so that the thermoplastic raw material is melted into a liquid state;
s3, manual spreading: manually spreading the thermoplastic plastic blank melted into a liquid state by an operator;
s4, automatic spreading: an operator uses an injection molding machine to spread the thermoplastic plastic blank melted into a liquid state;
s5, forming a die: drying the thermoplastic plastic blank melted into liquid state before the blank is filled into a mould, extruding the blank into the mould, and then closing the mould, wherein the temperature is controlled to be 170-210 ℃;
s6, heat preservation and pressure maintaining: continuously maintaining the temperature and pressure of the blank after the blank is loaded into the die;
s7, opening the die and stripping: after the thermoplastic plastic blank is molded in the mold, opening the mold, and taking out the plastic part;
s8, die cleaning: after the plastic part is taken out, cleaning the inner wall of a die cavity of the die;
s9, the next cycle: a molding step of reciprocally circulating the plastic part;
s10, trimming: carrying out edge trimming on the molded product of the plastic part taken out of the die, so as to avoid the influence of edge burrs on the overall quality of the finished product;
s11, detecting a finished product: softness and surface cleanliness were tested on the molded thermoplastic parts.
Referring to fig. 2, the preparation of the materials in S1 includes: weighing, cutting and comminuting, wherein the thermoplastic weighing device is a primary electronic scale.
Referring to fig. 2, in the step S1, a thermoplastic micro-powder mill is adopted in the grinding process, wherein the grinding fineness range of the thermoplastic micro-powder mill is 25-120 μm, so that the reduction of the surface flatness of the finished product is avoided.
Referring to fig. 1, in the step S2, the thermoplastic plastic is fully melted by heating and stirring during the heating process of the thermoplastic plastic blank, so that the thermoplastic plastic is conveniently fully melted, and the gloss of the surface of the plastic product is convenient.
Referring to fig. 1, the automatic spreading in S4 is performed by using a screw of an injection molding machine, and the amount of the thermoplastic plastic blank can be metered in real time.
Referring to fig. 3, the thermoplastic blank is dried by a hopper dryer before the S5 die is formed, and the moisture in the thermoplastic blank is controlled to be between 0.05% and 0.02%, so that the phenomenon of air bubbles in the finished product is avoided.
Referring to fig. 1, the steps S8 and S10 are performed simultaneously, and in addition, in step S8, the surface of the male die and the surface of the female die in the mold are cleaned by using a fiber brush, so that the male die and the female die in the mold are cleaned, and the phenomenon that the male die and the female die adhere to the wall of the cavity of the mold for the last time and the next normal quality is affected is prevented.
Referring to fig. 1, in the step S10, the trimming is performed mainly by using a BD-1010B burr machine, and meanwhile, the processing capacity of the BD-1010B burr machine is 10-20 kg each time, so that the phenomenon of low manual production efficiency is avoided.
Referring to fig. 1, the softness test in S11 is performed using a plastic ball indentation hardness tester.
The specific working principle is as follows: as shown in fig. 1 to 3, when the preparation method of the thermoplastic plastic product is used, firstly, selecting thermoplastic plastic raw materials, measuring specific mass, crushing the thermoplastic plastic raw materials into fine powder, heating and melting the thermoplastic plastic raw materials, placing the thermoplastic plastic blank in a mould through an injection molding machine, preserving heat and maintaining pressure for molding, demolding and taking out the parts, cleaning the mould for recycling, trimming burrs of plastic parts taken out of the mould, hardness detection and surface flatness detection of the trimmed products, packaging and warehousing, and optionally crushing the plastics into fine powder, melting the thermoplastic plastic blank, conveying the materials through an injection molding machine, adding the materials into the mould for molding, thereby reducing the glossiness of the surface of a plastic finished product, reducing the phenomenon of surface caking of the finished product caused by the particle shape of the thermoplastic plastic raw materials, and improving the quality of the finished product; further, before the thermoplastic plastic blank is added into a die, the thermoplastic plastic blank is dried by a hopper dryer, the moisture in the thermoplastic plastic blank is controlled to be between 0.05 and 0.02 percent, the frequency of bubbles on the surface of a formed plastic product is reduced, and meanwhile, the smooth proceeding of the thermoplastic plastic product and the quality of plastic parts are ensured.
The embodiments of the present invention have been shown and described for the purpose of illustration and description, it being understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made therein by one of ordinary skill in the art without departing from the scope of the invention.
Claims (9)
1. A method of making a thermoplastic article comprising the steps of:
s1, material selection preparation: selecting thermoplastic raw materials, mainly Polyethylene (PE), polypropylene (PVC) and Polystyrene (PS), and then treating the thermoplastic raw materials;
s2, preheating a blank: placing the treated thermoplastic raw material in a heating furnace for preheating treatment, so that the thermoplastic raw material is melted into a liquid state;
s3, manual spreading: manually spreading the thermoplastic plastic blank melted into a liquid state by an operator;
s4, automatic spreading: an operator uses an injection molding machine to spread the thermoplastic plastic blank melted into a liquid state;
s5, forming a die: drying the thermoplastic plastic blank melted into liquid state before the blank is filled into a mould, extruding the blank into the mould, and then closing the mould, wherein the temperature is controlled to be 170-210 ℃;
s6, heat preservation and pressure maintaining: continuously maintaining the temperature and pressure of the blank after the blank is loaded into the die;
s7, opening the die and stripping: after the thermoplastic plastic blank is molded in the mold, opening the mold, and taking out the plastic part;
s8, die cleaning: after the plastic part is taken out, cleaning the inner wall of a die cavity of the die;
s9, the next cycle: a molding step of reciprocally circulating the plastic part;
s10, trimming: carrying out edge trimming on the molded product of the plastic part taken out of the die, so as to avoid the influence of edge burrs on the overall quality of the finished product;
s11, detecting a finished product: softness and surface cleanliness were tested on the molded thermoplastic parts.
2. A method of making a thermoplastic article as defined in claim 1, wherein: the preparation of the materials in the step S1 comprises the following steps: weighing, cutting and comminuting, wherein the thermoplastic weighing device is a primary electronic scale.
3. A method of making a thermoplastic article as defined in claim 1, wherein: the grinding process in the step S1 adopts a thermoplastic plastic micro-powder grinder, wherein the grinding fineness range of the thermoplastic plastic micro-powder grinder is 25-120 mu m.
4. A method of making a thermoplastic article as defined in claim 1, wherein: and in the step S2, the thermoplastic plastic is fully melted by adopting a mode of heating and stirring during the heating process of the thermoplastic plastic blank.
5. A method of making a thermoplastic article as defined in claim 1, wherein: and S4, feeding is carried out by adopting an injection molding machine screw rod for automatic spreading, and the amount of the thermoplastic plastic blank can be metered in real time.
6. A method of making a thermoplastic article as defined in claim 1, wherein: and (5) drying the thermoplastic plastic blank by a hopper dryer before the S5 die is formed, and controlling the moisture in the thermoplastic plastic blank to be between 0.05 and 0.02 percent.
7. A method of making a thermoplastic article as defined in claim 1, wherein: and the step S8 and the step S10 are carried out simultaneously in two working procedures, and in addition, the surface of a male die and the surface of a female die in the die are cleaned by adopting a fiber hairbrush in the step S8.
8. A method of making a thermoplastic article as defined in claim 1, wherein: the trimming in the step S10 is mainly performed by using a BD-1010B burr machine, and the processing capacity of the BD-1010B burr machine is 10-20 kg each time.
9. A method of making a thermoplastic article as defined in claim 1, wherein: and S11, a plastic ball indentation hardness tester is adopted for softness test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211652037.3A CN116277707A (en) | 2022-12-21 | 2022-12-21 | Preparation method of thermoplastic plastic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211652037.3A CN116277707A (en) | 2022-12-21 | 2022-12-21 | Preparation method of thermoplastic plastic product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116277707A true CN116277707A (en) | 2023-06-23 |
Family
ID=86778581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211652037.3A Pending CN116277707A (en) | 2022-12-21 | 2022-12-21 | Preparation method of thermoplastic plastic product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116277707A (en) |
-
2022
- 2022-12-21 CN CN202211652037.3A patent/CN116277707A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3562373A (en) | Method of manufacturing pellets of thermoplastic material | |
| US6544452B1 (en) | Polymer processing method and tablet-forming apparatus | |
| CA1332765C (en) | Gelatine granules as well as methods and apparatus for their manufacture | |
| CN101945743A (en) | Method and device for injection molding plastic material | |
| US2755509A (en) | Process for producing densified granular thermosetting molding compositions | |
| CA2079955C (en) | Method for producing formed blanks from thermoplastically workable component mixtures | |
| US9327425B2 (en) | Process for making a pellet | |
| JP7129971B2 (en) | Method for producing bioplastic granules based on sunflower seed husk/hull material | |
| CN116277707A (en) | Preparation method of thermoplastic plastic product | |
| US12017384B2 (en) | Integrated system and method for recycling and processing compound materials | |
| TWI667977B (en) | Method for manufacturing fiber straw and device thereof | |
| US11447617B2 (en) | Recycling of polymer materials | |
| US20160303767A1 (en) | Biodegradable thermoplastic moulding and extrusion compounds made from biomass | |
| CN111070547A (en) | High-efficiency energy-saving plastic part injection molding process | |
| RU2820446C1 (en) | Method of producing granules from wastes of copolymers of ethylene with vinyl acetate | |
| CN107722660A (en) | A kind of high intensity liquid detergent bottle and preparation method | |
| CN215434502U (en) | Antistatic plastic master batch processing extrusion mechanism | |
| CN114851497A (en) | One-step forming processing method for plastic transparent outer package production | |
| JP2000141396A (en) | Production of molded product | |
| CN116426014A (en) | Degradable breathable film and preparation method thereof | |
| JP2001081201A (en) | Preparation of mixed pellet and molded product | |
| CN116948362A (en) | Modified thermoplastic polyester elastomer, EVA (ethylene-vinyl acetate) foamed sole of modified thermoplastic polyester elastomer and preparation method of EVA foamed sole | |
| CN111849072A (en) | Formula and production process of injection molding tray bottom plate and injection molding tray panel | |
| CN117087215A (en) | Forming process for processing plastic waste garbage bin | |
| RU99117323A (en) | METHOD FOR EXTRUSION PRODUCTION |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |