CN117922044A - In-mold injection molding process for knitted fabric - Google Patents
In-mold injection molding process for knitted fabric Download PDFInfo
- Publication number
- CN117922044A CN117922044A CN202410276965.7A CN202410276965A CN117922044A CN 117922044 A CN117922044 A CN 117922044A CN 202410276965 A CN202410276965 A CN 202410276965A CN 117922044 A CN117922044 A CN 117922044A
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- China
- Prior art keywords
- plastic
- knitted fabric
- mold
- injection molding
- cavity
- 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
- 239000004744 fabric Substances 0.000 title claims abstract description 74
- 238000001746 injection moulding Methods 0.000 title claims abstract description 36
- 239000004033 plastic Substances 0.000 claims abstract description 73
- 229920003023 plastic Polymers 0.000 claims abstract description 73
- 239000002994 raw material Substances 0.000 claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 36
- 239000007924 injection Substances 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000013329 compounding Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 9
- 238000009940 knitting Methods 0.000 claims description 8
- 229920001225 polyester resin Polymers 0.000 claims description 4
- 239000004645 polyester resin Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000003698 laser cutting Methods 0.000 claims description 3
- 239000002991 molded plastic Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 15
- 239000003292 glue Substances 0.000 description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 239000004831 Hot glue Substances 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/74—Heating or cooling of the injection unit
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an in-mold injection molding process for knitted fabric, which has the advantages of less manufacturing process stations, high yield and low cost. The method is characterized in that the raw materials used by the method comprise knitted fabric raw materials and plastic raw materials, and the specific steps are as follows: s1, pre-die-cutting knitted fabric raw materials into knitted fabric with corresponding shapes; s2, placing the knitted fabric in a cavity of an injection mold, enabling the knitted fabric to be attached to the inner surface of the cavity, and enabling a pouring opening of the injection mold to be communicated with the cavity through a material channel; s3, heating the plastic raw material to a molten state in advance, and injecting the molten plastic raw material into a pouring port of an injection mold through an injection device so that the molten plastic raw material enters a cavity; s4, compounding the plastic raw material in a molten state with the surface of the knitted fabric, and completing injection molding; s5, taking out the formed blank and cutting the shape by laser; s6, cutting corresponding functional holes through laser to manufacture the plastic product.
Description
Technical Field
The invention relates to the technical field of in-mold insert injection molding, in particular to an in-mold injection molding process for knitted fabrics.
Background
When the plastic product is manufactured, when the inner cavity surface of the product is knitted fabric and the bottom shell is a plastic bottom shell, the existing processing technology is as follows: cutting knitted fabric, covering the knitted fabric with hot melt adhesive, injection molding the bottom shell, hot pressing and laminating the bottom shell and the knitted fabric, and cutting the keyboard hole and the appearance by laser, wherein the knitted fabric and the plastic bottom shell are adhered by adhesive, and the adhesive is not environment-friendly; the thickness of the glue at the special structure position of the product is inconsistent, so that the appearance problems such as folds of the knitted fabric are caused; the process has the advantages of more product stations, high yield loss and high cost; when in actual use, the knitted fabric and the plastic bottom shell have degumming phenomenon after long-term use; for this reason, there is an urgent need to develop a more rational process for the assembly of the knitted fabric and the plastic bottom case.
Disclosure of Invention
Aiming at the problems, the invention provides an in-mold injection molding process for knitted fabrics, which has the advantages of less manufacturing process stations, high yield, low cost, no need of glue, environmental protection, no wrinkles on the surface of the manufactured knitted fabrics, and good binding force between the knitted fabrics and a plastic bottom shell.
The in-mold injection molding process for the knitted fabric is characterized in that the used raw materials comprise the knitted fabric raw materials and the plastic raw materials, and the specific steps are as follows:
s1, pre-die-cutting knitted fabric raw materials into knitted fabric with corresponding shapes;
S2, placing the knitted fabric in a cavity of an injection mold, enabling the knitted fabric to be attached to the inner surface of the cavity, and enabling a pouring opening of the injection mold to be communicated with the cavity through a material channel;
s3, heating the plastic raw material to a molten state in advance, and injecting the molten plastic raw material into a pouring port of an injection mold through an injection device so that the molten plastic raw material enters a cavity;
S4, compounding the plastic raw material in a molten state with the surface of the knitted fabric, and completing injection molding;
s5, taking out the formed blank and cutting the shape by laser;
s6, cutting corresponding functional holes through laser to manufacture the plastic product.
It further comprises is characterized in that:
In the step S3, the plastic raw material is heated by a screw conveyor and is injected into a pouring port of an injection mold through an output end cavity of the screw conveyor;
The whole spiral roller of the spiral conveyor is pushed to inject and fill molten plastic in the cavity of the output end into a pouring port of the injection mold, so that the plastic filling has a segmented proceeding condition;
the heating of the screw conveyor is sectional heating, and the heating temperature close to the output end of the screw conveyor is highest, so that the molten state of plastic in output is ensured;
When the screw conveyor is used for injection filling and feeding, the screw conveyor is divided into two sections, wherein the first section is filled at a high speed, plastic is rapidly filled into a cavity space, the second end is filled at a low speed, and the plastic is filled into each material shortage corner of the cavity in a supplementing manner, so that the quality of a product after injection molding is stable and reliable;
step S2, preforming knitted fabric through an injection mold in advance, and then moving a mold part of the injection mold, which is provided with a sprue gate, outwards to reserve a cavity space of plastic;
in the step S4, redundant rim charge is left on the periphery of the molded plastic bottom shell and knitted fabric, and is removed through laser cutting in the step S5;
Step S4, after the mold is closed, the pressure is maintained until the plastic is completely injected and filled;
step S4, after the pressure keeping is finished, opening the die, and then, cooling by air is needed;
The knitting cloth raw material and the plastic raw material are made of the same large polyester resin, so that the binding force between the plastic particles in a molten state and the knitting cloth is good in the injection molding process.
After the invention is adopted, the knitted fabric is directly bonded with the plastic bottom shell by an injection molding process, and glue is not needed, so that the invention is more environment-friendly; the plastic particles are uniformly combined with the knitted fabric by adopting an injection molding process, so that the problem of wrinkles can be solved; the optimized forming process reduces work stations, improves yield, reduces cost, and ensures that the plastic particles have better binding force with the knitted fabric after being melted by an injection molding process; the traditional hot-pressed back hot-melt adhesive mode is changed, the integrated forming scheme is adopted, the use of glue and other base materials is eliminated, and the process flow is greatly simplified; in addition, the recovery and decomposition of the product are considered in the whole process route setting of the product, and the used materials are recyclable environment-friendly materials, so that the environment is protected in the production process, the environment-friendly material conforms to the environment-friendly concept of more and more consumers and enterprises, and the environment-friendly recovery is facilitated after the life cycle of the product is finished.
Drawings
FIG. 1 is a schematic diagram of an assembly of an injection mold and a screw conveyor employed in the present invention;
FIG. 2 is a schematic view of the knitted fabric and the plastic bottom shell according to the present invention after injection molding is completed;
The names corresponding to the serial numbers in the figures are as follows:
knitting cloth 1 and a plastic bottom shell 2;
injection mold 10, cavity 101, gate 102, runner 103, screw conveyor 20, output cavity 201, screw roller 202, and drive rod 203.
Detailed Description
The raw materials used in the in-mold injection molding process for the knitted fabric, see fig. 1 and 2, comprise knitted fabric raw materials and plastic raw materials, and specifically comprise the following steps:
S1, pre-die-cutting a knitted fabric raw material into a knitted fabric 1 with a corresponding shape;
s2, placing knitted fabric in a cavity 101 of the injection mold 10, enabling the knitted fabric to be attached to the inner surface of the cavity 101, and enabling a pouring opening 102 of the injection mold 10 to be communicated with the cavity 101 through a material channel 103;
s3, heating the plastic raw material to a molten state in advance, and injecting the molten plastic raw material into a pouring port of an injection mold through an injection device so that the molten plastic raw material enters a cavity 101;
S4, compounding the plastic raw material in a molten state with the surface of the knitted fabric, and completing injection molding;
s5, taking out the formed blank and cutting the shape by laser;
s6, cutting corresponding functional holes through laser to manufacture the plastic product.
In a specific embodiment, the plastic raw material is specifically PET polyethylene terephthalate plastic particles, the trademark is golden EASTAR-G00 NC130, the knitting raw material is PET fiber, which is also called PET fiber, and is commonly called polyester fiber and PET fiber, and the PET fiber has the advantages of high strength, good elasticity, good heat setting performance, good heat resistance, acid and alkali resistance and the like.
In the specific implementation, the knitted fabric 1 in the step S2 is preformed by an injection mold in advance, and then the mold part of the injection mold 10 provided with the sprue gate 102 is moved outwards, so as to leave a cavity space of plastic;
In step S3, the plastic raw material is heated by the screw conveyor 20 and injected into the pouring port 102 of the injection mold 10 through the output end cavity 201 of the screw conveyor 20;
The whole of the screw roller 202 of the screw conveyor 20 is pushed by the whole of the driving rod 203 at the rear end, so that the molten plastic in the output end cavity 201 is injected and filled into the pouring opening 102 of the injection mold 10, and the plastic filling is provided with a sectionalized proceeding condition;
The heating of the screw conveyor 20 is sectional heating, the heating temperature close to the output end of the screw conveyor 20 is highest, specifically the heating of the screw conveyor 20 is divided into six sections of heating, see fig. 2, which is divided into a first section of heating, a second section of heating, a third section of heating, a fourth section of heating, a fifth section of heating and a sixth section of heating from right to left, wherein the first section of heating is 235 ℃, the second section of heating is 245 ℃, the third section of heating is 255 ℃, the fourth section of heating is 265 ℃, the fifth section of heating is 275 ℃, and the sixth section of heating is 280 ℃, and the molten state of plastic output is ensured;
The screw conveyor 20 is divided into two sections when injection filling and feeding are carried out, the first section is high-speed filling, the plastic moving distance of the output end cavity corresponding to filling is 45mm, the moving speed is 30mm/s, so that the plastic is quickly filled into the cavity space, the second end is low-speed filling, the plastic moving distance of the output end cavity corresponding to filling is 15mm, the moving speed is 15mm/s, the plastic is filled into each material shortage corner of the cavity in a supplementing mode, the filling pressure in the filling process is 200Mpa, and the stable and reliable product quality after injection molding is ensured;
In the step S4, redundant rim charge is left on the periphery of the molded plastic bottom shell 2 and the knitted fabric 1, and is removed by laser cutting in the step S5;
In the step S4, after the injection mold 10 is closed and the plastic is completely injected and filled, the pressure is maintained at 80Mpa for 0.8S;
And S4, after the pressure keeping is finished, opening the die, performing air cooling for 20S, and then demolding and taking out the molded blank.
In the concrete implementation, the knitting cloth raw material and the plastic raw material are made of the same large polyester resin, so that the binding force between the plastic particles in a molten state and the knitting cloth is good in the injection molding process.
After the process is adopted, the knitted fabric is directly bonded with the plastic bottom shell by an injection molding process, and glue is not needed, so that the process is more environment-friendly; the plastic particles are uniformly combined with the knitted fabric by adopting an injection molding process, so that the problem of wrinkles can be solved; the optimized forming process reduces work stations, improves yield and reduces cost; the plastic particles and the knitted fabric are made of the same large polyester resin, and the plastic particles are fused by an injection molding process and have better binding force with the knitted fabric; the traditional hot-pressed back hot-melt adhesive mode is changed, the integrated forming scheme is adopted, the use of glue and other base materials is eliminated, and the process flow is greatly simplified; in addition, the recovery and decomposition of the product are considered in the whole process route setting of the product, and the used materials are recyclable environment-friendly materials, so that the environment is facilitated in the production process, the environment-friendly concept of more and more consumers and enterprises is met, and the environment-friendly recovery is facilitated after the life cycle of the product is finished; the process scheme is improved, scheme adjustment is made by utilizing the characteristics of the cloth, so that the cloth is better combined with the injection molding material, the advantages of the product subjected to process adjustment in terms of performance and appearance are improved, more customized options are provided, and the product can attract consumers pursuing individuation and high quality; and the injection structure of the ingenious injection mold and the screw conveyor makes up the problem that the product cannot be solved by the process, the life cycle of the product is improved, the durability of the produced product is better, reworking and rejection rate are reduced, and the yield is improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. The in-mold injection molding process for the knitted fabric is characterized in that the used raw materials comprise the knitted fabric raw materials and the plastic raw materials, and the specific steps are as follows:
s1, pre-die-cutting knitted fabric raw materials into knitted fabric with corresponding shapes;
S2, placing the knitted fabric in a cavity of an injection mold, enabling the knitted fabric to be attached to the inner surface of the cavity, and enabling a pouring opening of the injection mold to be communicated with the cavity through a material channel;
s3, heating the plastic raw material to a molten state in advance, and injecting the molten plastic raw material into a pouring port of an injection mold through an injection device so that the molten plastic raw material enters a cavity;
S4, compounding the plastic raw material in a molten state with the surface of the knitted fabric, and completing injection molding;
s5, taking out the formed blank and cutting the shape by laser;
s6, cutting corresponding functional holes through laser to manufacture the plastic product.
2. An in-mold injection molding process for knitted fabrics according to claim 1, wherein: in the step S3, the plastic raw material is heated by the screw conveyor and injected into a pouring opening of the injection mold through an output end cavity of the screw conveyor.
3. An in-mold injection molding process for knitted fabrics according to claim 2, wherein: the screw roller of the screw conveyor is integrally pushed to inject and fill molten plastic in the cavity of the output end into the pouring opening of the injection mold, so that the plastic filling is provided with a segmented running condition.
4. An in-mold injection molding process for knitted fabrics according to claim 3, wherein: the heating of the screw conveyor is sectional heating, and the heating temperature close to the output end of the screw conveyor is highest, so that the molten state of plastic in output is ensured.
5. An in-mold injection molding process for knitted fabrics according to claim 3, wherein: the spiral conveyor is used for injection filling feeding, and is divided into two sections, wherein the first section is filled at a high speed, plastic is rapidly filled into a cavity space, the second section is filled at a low speed, and the plastic is filled into each material shortage corner of the cavity.
6. An in-mold injection molding process for knitted fabrics according to claim 1, wherein: in step S2, the knitted fabric is preformed by an injection mold in advance, and then a mold portion of the injection mold provided with a sprue is moved outward, leaving a cavity space for the plastic.
7. An in-mold injection molding process for knitted fabrics according to claim 1, wherein: in the step S4, redundant rim charge is left on the periphery of the molded plastic bottom shell and the knitted fabric, and is removed through laser cutting in the step S5.
8. An in-mold injection molding process for knitted fabrics according to claim 1, wherein: and S4, after the mold is closed and the plastic is completely injected and filled, pressure maintaining is needed.
9. An in-mold injection molding process for knitted fabrics according to claim 8, wherein: and S4, after the pressure keeping is finished, opening the die, and then, cooling by air is needed.
10. An in-mold injection molding process for knitted fabrics according to claim 1, wherein: the knitting cloth raw material and the plastic raw material are made of the same large polyester resin, so that the binding force between the plastic particles in a molten state and the knitting cloth is good in the injection molding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410276965.7A CN117922044A (en) | 2024-03-12 | 2024-03-12 | In-mold injection molding process for knitted fabric |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410276965.7A CN117922044A (en) | 2024-03-12 | 2024-03-12 | In-mold injection molding process for knitted fabric |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117922044A true CN117922044A (en) | 2024-04-26 |
Family
ID=90759635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410276965.7A Pending CN117922044A (en) | 2024-03-12 | 2024-03-12 | In-mold injection molding process for knitted fabric |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117922044A (en) |
-
2024
- 2024-03-12 CN CN202410276965.7A patent/CN117922044A/en active Pending
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