CN110625884A - Interlayer injection molding method - Google Patents
Interlayer injection molding method Download PDFInfo
- Publication number
- CN110625884A CN110625884A CN201810659014.2A CN201810659014A CN110625884A CN 110625884 A CN110625884 A CN 110625884A CN 201810659014 A CN201810659014 A CN 201810659014A CN 110625884 A CN110625884 A CN 110625884A
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- Prior art keywords
- feeding
- injection molding
- temperature range
- product
- temperature
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
- B29C45/1643—Making multilayered or multicoloured articles having a "sandwich" structure from at least three different materials or with at least four layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C2045/1692—Making multilayered or multicoloured articles one layer comprising fibres
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The interlayer injection molding method comprises respectively placing material A and material B into corresponding injection molding machines; effectively controlling the temperature of the die; after the material A and the material B are fed in proportion respectively, extruding the rest material A again, and stopping feeding; maintaining the pressure, cooling, opening the mold and ejecting. The invention has the characteristics of capability of carrying out injection molding on two materials with larger performance difference, capability of using a new material and a secondary material in a mixed manner, higher yield and lower production cost.
Description
Technical Field
The invention relates to a manufacturing method of interlayer injection molding, and belongs to the field of injection molding.
Background
The single-material injection molding method is generally adopted, such as the injection molding method of a handle for a vehicle, and the single-material injection molding and gas-assisted method is adopted, but the single-material injection molding product is single, the product is generally large, the shape is not attractive, and the mechanical property is poor; the latter method adds air auxiliary method, although can prepare the product with complex structure, shape and mechanical property are all improved to some extent, but the waste is bigger on raw material, because the air auxiliary method needs to have a material package outside the product to guarantee the hollow structure inside the product, the demand for raw material is big, at the same time, air holes are left on the product, because the product is processed by the subsequent electroplating process, the air holes are sealed, thus increasing the production cycle, the qualification rate of the product is reduced by the influence, and the cost of the product is increased. The two injection molding methods cannot mix new materials with secondary materials for use, and the production cost is increased.
Disclosure of Invention
Aiming at the problems, the invention provides the sandwich injection molding method which can prepare products with complex structures, has excellent outer surfaces and mechanical properties, can be used by combining new materials and secondary materials, has high natural yield and reduces the production cost. The technical scheme of the invention for solving the problems comprises the following steps: 1. respectively placing the material A and the material B into two hoppers of an injection molding machine, wherein the temperature range of the injection cylinder corresponding to the material A is 240 ℃ to 30 ℃, the temperature range of the injection cylinder corresponding to the material A is gradually decreased from the head part of the injection cylinder to the last section of heating belt, the gradually decreased temperature range is 5 ℃ to 30 ℃, the temperature range of the injection cylinder corresponding to the material B is 220 ℃ to 25 ℃, the temperature range of the injection cylinder corresponding to the material B is gradually decreased from the head part of the injection cylinder to the last section of heating belt, and the gradually decreased temperature range is 5 ℃ to 25 ℃; 2, controlling the temperature of the die, namely controlling the temperature of an upper die to be 85 ℃ and 10 ℃ and controlling the temperature of a lower die to be 75 ℃ and 10 ℃; starting feeding of the material A, and stopping feeding when the feeding amount of the material A reaches 50 percent of the total volume of the product; feeding the material B, and stopping feeding when the feeding amount of the material B reaches 30 percent of the total volume of the product; 4, feeding the material A again, extruding the residual material A, and stopping feeding; 5. maintaining the pressure, cooling, opening the mold and ejecting.
After the method is adopted, compared with the prior art, the feeding sequence of the material A, the material B and the material A is that the material B props the material A in the die cavity, and after the material A is finally sealed, the material B forms an interlayer in the material A, so that the material B can use a material with larger performance difference with the material A, for example, the material B can use a material with low viscosity to reduce the injection pressure, so that the energy consumption is saved, and the production cost is reduced; if the material B can use recycled secondary materials, the overall cost of the raw materials is reduced, and meanwhile, the effects of energy conservation and environmental protection are achieved; according to different use characteristics, the material A is made of a soft material, the material B is made of a hard material to increase the mechanical property, or the material B is made of lower-quality foamed plastic to reduce the volume; the material A or the material B can be expensive and have special surface properties, such as materials for preventing electromagnetic wave interference, high conductivity and the like, so as to increase the functions of the product, and the product has more using functions; the sandwich type matching of the material A and the material B can also reduce the residual stress of a formed product, increase the mechanical strength or the surface property of the product and improve the yield. Therefore, the invention has the characteristics of capability of performing injection molding on two materials with larger performance difference, capability of using a new material and a secondary material in a mixed manner, higher yield and lower production cost. The material A is PC/ABS, and the PC/ABS is a mixture of polycarbonate and acrylonitrile-butadiene-styrene copolymer. The material B is PC/ABS-GF30 or SAN-GF35, and the SAN-GF35 is styrene-acrylonitrile copolymer containing 35 percent of glass fiber; PC/ABS-GF30 is a mixture of polycarbonate containing 30% glass fibers and acrylonitrile-butadiene-styrene copolymer. The feeding amount of the material A in the step 3 is 40 percent. The feeding amount of the material B in the step 3 is 25 percent. The amount of the material A remained in the step 4 is 35 percent.
Detailed description of the preferred embodiments
The present invention is further described below in conjunction with specific embodiments.
Example 1, a method of sandwich injection molding, comprising the steps of: 1. respectively placing the material A and the material B into two hoppers of an injection molding machine, wherein the temperature range of the injection cylinder corresponding to the material A is in the range of 240 DEG and 10 ℃, the temperature range of each section of heating belt from the head of the injection cylinder to the last is gradually reduced, the temperature range of each section of heating belt is 10 ℃, the material A is PC/ABS, the temperature range of the injection cylinder corresponding to the material B is in the range of 225 DEG and 10 ℃, the temperature range of each section of heating belt from the head of the injection cylinder to the last is gradually reduced, the temperature range of each section of heating belt is 5 ℃, and the material B is SAN-GF 35; 2. controlling the temperature of the die, namely controlling the temperature of an upper die at 75 ℃ and controlling the temperature of a lower die at 65 ℃; starting feeding of the material A, and stopping feeding when the feeding amount of the material A reaches 30 percent of the total volume of the product; feeding the material B, and stopping feeding when the feeding amount of the material B reaches 30 percent of the total volume of the product; 4, feeding the material A again, extruding the rest material A accounting for 40 percent of the total volume of the product, and stopping feeding, wherein the feeding of the material A is used for sealing the product, so that the condition of mixing materials cannot occur in the next production of the product; 5. and (4) maintaining the pressure, cooling, starting cooling while maintaining the pressure, and opening the die for ejection.
Embodiment 2, a method for manufacturing an interlayer injection molding, comprising the steps of: 1. respectively placing the material A and the material B into two hoppers of an injection molding machine, wherein the temperature range of the injection cylinder corresponding to the material A is 245 ℃ and 10 ℃, the temperature range from the head of the injection cylinder to the last section of heating belt is gradually reduced, the gradually reduced temperature range is 15 ℃, the material A is PC/ABS, the temperature range of the injection cylinder corresponding to the material B is 225 ℃ and 15 ℃, the temperature range from the head of the injection cylinder to the last section of heating belt is gradually reduced, the gradually reduced temperature range is 8 ℃, and the material B is SAN-GF 35; 2. controlling the temperature of the die, namely controlling the temperature of the upper die to be 85 ℃ and controlling the temperature of the lower die to be 75 ℃; starting feeding of the material A, and stopping feeding when the feeding amount of the material A reaches 40 percent of the total volume of the product; feeding the material B, and stopping feeding when the feeding amount of the material B reaches 25 percent of the total volume of the product; 4, feeding the material A again, extruding the rest material A accounting for 35 percent of the total volume of the product, and stopping feeding, wherein the feeding of the material A is used for sealing the product, so that the condition of mixing materials cannot occur in the next production of the product; 5. maintaining the pressure, cooling, opening the mold and ejecting.
Example 3, sandwich injection molding process, the steps were as follows: 1. respectively placing the material A and the material B into two hoppers of an injection molding machine, wherein the temperature range of the injection cylinder corresponding to the material A is 265 ℃ and 10 ℃ in a descending manner from the head part of the injection cylinder to each section of the last heating belt, the descending temperature range is 20 ℃, the material A is PC/ABS, the temperature range of the injection cylinder corresponding to the material B is 235 ℃ and 10 ℃ in a descending manner from the head part of the injection cylinder to each section of the last heating belt, the descending temperature range is 18 ℃, and the material B is PC/ABS-GF 30; 2. controlling the temperature of the die, namely controlling the temperature of an upper die at 95 ℃ and controlling the temperature of a lower die at 85 ℃; starting feeding of the material A, and stopping feeding when the feeding amount of the material A reaches 50 percent of the total volume of the product; feeding the material B, and stopping feeding when the feeding amount of the material B reaches 20 percent of the total volume of the product; 4, feeding the material A again, extruding the rest material A accounting for 30 percent of the total volume of the product, and stopping feeding, wherein the feeding of the material A is used for sealing the product, so that the condition of mixing materials cannot occur in the next production of the product; 5. maintaining the pressure, cooling, opening the mold and ejecting.
The above embodiments are some of the selected embodiments of the present invention, and alternative manufacturing methods within the technical scope of the invention in the field should be included in the protection scope of the present invention.
Claims (4)
1. The interlayer injection molding method is characterized by comprising the following steps of 1, respectively placing the material A and the material B into two hoppers of an injection molding machine, wherein the temperature range of an injection tube corresponding to the material A is 240 ℃ and 30 ℃, the temperature range of each section of heating belt from the head of the injection tube to the last is gradually reduced, the gradually reduced temperature range is 5-30 ℃, the temperature range of the injection tube corresponding to the material B is 220 ℃ and 25 ℃, the temperature range of each section of heating belt from the head of the injection tube to the last is gradually reduced, and the gradually reduced temperature range is 5-25 ℃; 2. controlling the temperature of the die, namely controlling the temperature of an upper die at 85 ℃ to 20 ℃, and controlling the temperature of a lower die at 75 ℃ to 20 ℃; starting feeding of the material A, stopping feeding when the feeding amount of the material A reaches 50 percent of the total volume of the product, starting feeding of the material B, and stopping feeding when the feeding amount of the material B reaches 209 gamma 30 percent of the total volume of the product; 4, feeding the material A again, extruding the residual material A, and stopping feeding; 5. maintaining the pressure, cooling, opening the mold and ejecting.
2. The method of claim 1, wherein the material A is PC/ABS and the material B is SAN-GF35 or PC/ABS-GF 30.
3. The sandwich injection molding manufacturing method according to claim 1, characterized in that in the step 3, the feeding amount of the material A is 40%, and the feeding amount of the material B is 25%; the amount of material a remaining in step 4 was 35%.
4. Alternative methods of fabrication within the scope of the invention are intended to be within the scope of the invention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810659014.2A CN110625884A (en) | 2018-06-25 | 2018-06-25 | Interlayer injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810659014.2A CN110625884A (en) | 2018-06-25 | 2018-06-25 | Interlayer injection molding method |
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| CN110625884A true CN110625884A (en) | 2019-12-31 |
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| CN201810659014.2A Pending CN110625884A (en) | 2018-06-25 | 2018-06-25 | Interlayer injection molding method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252867A (en) * | 2020-10-14 | 2021-01-22 | 神通科技集团股份有限公司 | Automobile inner handle and manufacturing method thereof |
-
2018
- 2018-06-25 CN CN201810659014.2A patent/CN110625884A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252867A (en) * | 2020-10-14 | 2021-01-22 | 神通科技集团股份有限公司 | Automobile inner handle and manufacturing method thereof |
| CN112252867B (en) * | 2020-10-14 | 2022-04-22 | 神通科技集团股份有限公司 | Automobile inner handle and manufacturing method thereof |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20191231 |
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| WD01 | Invention patent application deemed withdrawn after publication |