CN112519102A - Method for forming bicolor plastic product - Google Patents
Method for forming bicolor plastic product Download PDFInfo
- Publication number
- CN112519102A CN112519102A CN202011177133.8A CN202011177133A CN112519102A CN 112519102 A CN112519102 A CN 112519102A CN 202011177133 A CN202011177133 A CN 202011177133A CN 112519102 A CN112519102 A CN 112519102A
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- plastic
- cavity
- product
- compressed air
- molding
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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
- 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
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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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/174—Applying a pressurised fluid to the outer surface of the injected material inside the mould cavity, e.g. for preventing shrinkage marks
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a molding method of a bicolor plastic product, which belongs to the field of plastic product processing and comprises the following steps: s1, injecting a first plastic in a molten state into a cavity of the mold, and injecting the first plastic from the lower part of the cavity during injection; s2, after the first plastic in the molten state is injected, injecting compressed air into the cavity from the upper part of the cavity, keeping the pressure of the compressed air in the cavity unchanged, and then cooling the mold to obtain a first finished product layer; s3, injecting a second plastic in a molten state into the cavity of the mold, and discharging compressed air in the cavity while injecting the second plastic; and S4, cooling the mold to cool the second plastic to form a second product layer, and combining the second product layer and the second product layer to obtain a plastic product finished product. The melting point of the first plastic is lower than that of the second plastic. The invention can rapidly complete the molding of the bicolor plastic product.
Description
Technical Field
The invention relates to the field of plastic product processing, in particular to a method for molding a double-color plastic product.
Background
Double-shot moulding refers to moulding plastics with two kinds of different colours, different kinds according to certain order through double-shot moulding machine, combines two kinds of plastics organically together, becomes a complete product, and it has very general application in plastic shaping technical field, but double-shot moulding machine's cost is higher, and double-shot plastic goods's shaping need use two moulds, divides twice shaping, and it is inconvenient to use and production efficiency hangs down.
Disclosure of Invention
Therefore, there is a need for a method for molding a two-color plastic product, comprising the following steps:
s1, injecting a first plastic in a molten state into a cavity of the mold, and injecting the first plastic from the lower part of the cavity during injection;
s2, after the first plastic in the molten state is injected, injecting compressed air into the cavity from the upper part of the cavity, keeping the pressure of the compressed air in the cavity unchanged, and then cooling the mold to obtain a first finished product layer;
injecting a first plastic from the bottom of the cavity to ensure that the first plastic is molded at the bottom of the cavity to obtain a first finished product layer; the compressed air is injected into the cavity to ensure that the first plastic in the molten state in the cavity has certain pressure, so that the temperature of the first plastic in the molten state is uniform, and the quality of the first finished product layer obtained by cooling and molding can be improved.
S3, injecting a second plastic in a molten state into the cavity of the mold, and discharging compressed air in the cavity while injecting the second plastic;
and S4, cooling the mold to cool the second plastic to form a second product layer, and combining the second product layer and the second product layer to obtain a plastic product finished product.
Wherein, the second plastic adopts a color different from that of the first plastic, so as to obtain a double-color plastic product finished product.
Further, the melting point of the first plastic is lower than that of the second plastic.
The melting point of the first plastic is lower than that of the second plastic, so that after the second plastic is injected into the cavity, the temperature of the second plastic is higher than that of the first plastic, the second plastic can melt the upper end of the first product layer, and gas entering the upper end of the first product layer during molding of the first product layer can be released, so that the gas in a finished plastic product can be discharged, and the quality of the finished plastic product is ensured.
In addition, the first plastic at the upper end of the first finished product layer is melted, the bonding force between the first finished product layer and the second finished product layer obtained by cooling is stronger, and the strength of a finished plastic product obtained by molding can be further improved.
Further, in step S2, the pressure of the compressed air is set according to the pressure required when the first plastic is molded.
The compressed air is used for increasing the pressure of the first plastic in a molten state so as to ensure that the first plastic is cooled and molded under proper pressure, and therefore the quality of a first finished product layer obtained by cooling and molding the first plastic can be improved.
Further, the compressed air is injected into the cavity through an air inlet pipe which is arranged above the mold and communicated with the cavity, and an air pressure sensor is arranged in the air inlet pipe.
And an air pressure sensor in the air inlet pipe is used for detecting the air pressure in the cavity so as to ensure that the air pressure in the cavity is kept unchanged.
Furthermore, the air inlet pipe extends out of the upper part of the mold, and a valve is further arranged at the upper end of the air inlet pipe.
The valve of intake pipe upper end is used for closing the intake pipe, avoids the second plastic to flow from the intake pipe, and wherein, the back is closed to the valve, and the compressed air of the intake pipe of not discharging can gather in tracheal top, can prevent second plastic and valve contact, plays the guard action to the valve.
Further, in step S2, when the cavity is cooled after the injection of the compressed air, the first plastic is continuously injected into the cavity, and the pressure of the compressed air in the cavity is kept unchanged.
Wherein, last to pouring into first plastic in the die cavity and can making the shared space of compressed air keep unchangeable, and then can guarantee that first plastic cooling shaping makes pressure keep unchangeable, the volume of reducing when can also replenishing first plastic cooling shaping simultaneously can prevent that the shape of first layer article layer from changing.
Further, in step S4, the second plastic is continuously injected into the cavity while cooling the second plastic to compensate for the gap formed in the cavity when the second plastic is cooled and shrunk.
And the second plastic is kept to be injected while being cooled so as to fill a gap formed in the cavity when the second plastic is cooled and shrunk, and further, the shape of the second finished product layer is prevented from being changed.
Further, in step S3, a second plastic is injected from above the cavity.
The invention can realize the molding of the double-color plastic product in the same cavity by introducing the compressed air, greatly facilitates the operation process and improves the production efficiency.
Detailed Description
In order to facilitate understanding for those skilled in the art, the present invention will be described in further detail below with reference to examples:
a molding method and an injection molding process of a double-color plastic product comprise the following steps:
s1, injecting a first plastic in a molten state into a cavity of the mold, and injecting the first plastic from the lower part of the cavity during injection;
s2, after the first plastic in the molten state is injected, injecting compressed air into the cavity from the upper part of the cavity, keeping the pressure of the compressed air in the cavity unchanged, and then cooling the mold to obtain a first finished product layer;
injecting a first plastic from the bottom of the cavity to ensure that the first plastic is molded at the bottom of the cavity to obtain a first finished product layer; the compressed air is injected into the cavity to ensure that the first plastic in the molten state in the cavity has certain pressure, so that the temperature of the first plastic in the molten state is uniform, and the quality of the first finished product layer obtained by cooling and molding can be improved.
S3, injecting a second plastic in a molten state into the cavity of the mold, and discharging compressed air in the cavity while injecting the second plastic;
and S4, cooling the mold to cool the second plastic to form a second product layer, and combining the second product layer and the second product layer to obtain a plastic product finished product.
Wherein, the second plastic adopts a color different from that of the first plastic, so as to obtain a double-color plastic product finished product.
Further, the melting point of the first plastic is lower than that of the second plastic.
The melting point of the first plastic is lower than that of the second plastic, so that after the second plastic is injected into the cavity, the temperature of the second plastic is higher than that of the first plastic, the second plastic can melt the upper end of the first product layer, and gas entering the upper end of the first product layer during molding of the first product layer can be released, so that the gas in a finished plastic product can be discharged, and the quality of the finished plastic product is ensured.
In addition, the first plastic at the upper end of the first finished product layer is melted, the bonding force between the first finished product layer and the second finished product layer obtained by cooling is stronger, and the strength of a finished plastic product obtained by molding can be further improved.
Further, in step S2, the pressure of the compressed air is set according to the pressure required when the first plastic is molded.
The compressed air is used for increasing the pressure of the first plastic in a molten state so as to ensure that the first plastic is cooled and molded under proper pressure, and therefore the quality of a first finished product layer obtained by cooling and molding the first plastic can be improved.
Further, the compressed air is injected into the cavity through an air inlet pipe which is arranged above the mold and communicated with the cavity, and an air pressure sensor is arranged in the air inlet pipe.
And an air pressure sensor in the air inlet pipe is used for detecting the air pressure in the cavity so as to ensure that the air pressure in the cavity is kept unchanged.
Furthermore, the air inlet pipe extends out of the upper part of the mold, and a valve is further arranged at the upper end of the air inlet pipe.
The valve of intake pipe upper end is used for closing the intake pipe, avoids the second plastic to flow from the intake pipe, and wherein, the back is closed to the valve, and the compressed air of the intake pipe of not discharging can gather in tracheal top, can prevent second plastic and valve contact, plays the guard action to the valve.
Further, in step S2, when the cavity is cooled after the injection of the compressed air, the first plastic is continuously injected into the cavity, and the pressure of the compressed air in the cavity is kept unchanged.
Wherein, last to pouring into first plastic in the die cavity and can making the shared space of compressed air keep unchangeable, and then can guarantee that first plastic cooling shaping makes pressure keep unchangeable, the volume of reducing when can also replenishing first plastic cooling shaping simultaneously can prevent that the shape of first layer article layer from changing.
Further, in step S4, the second plastic is continuously injected into the cavity while cooling the second plastic to compensate for the gap formed in the cavity when the second plastic is cooled and shrunk.
And the second plastic is kept to be injected while being cooled so as to fill a gap formed in the cavity when the second plastic is cooled and shrunk, and further, the shape of the second finished product layer is prevented from being changed.
Further, in step S3, a second plastic is injected from above the cavity.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A molding method of a bicolor plastic product is characterized by comprising the following steps:
s1, injecting a first plastic in a molten state into a cavity of the mold, and injecting the first plastic from the lower part of the cavity during injection;
s2, after the first plastic in the molten state is injected, injecting compressed air into the cavity from the upper part of the cavity, keeping the pressure of the compressed air in the cavity unchanged, and then cooling the mold to obtain a first finished product layer;
s3, injecting a second plastic in a molten state into the cavity of the mold, and discharging compressed air in the cavity while injecting the second plastic;
and S4, cooling the mold to cool the second plastic to form a second product layer, and combining the second product layer and the second product layer to obtain a plastic product finished product.
2. The method for molding a dual-color plastic product as claimed in claim 1, wherein the melting point of the first plastic is lower than the melting point of the second plastic.
3. The method for molding a two-color plastic product according to claim 2, wherein in step S2, the pressure of the compressed air is set according to the pressure required by the first plastic molding.
4. The method for molding a bicolor plastic product according to claim 3, wherein the compressed air is injected into the cavity through an air inlet pipe which is arranged above the mold and communicated with the cavity, and an air pressure sensor is arranged in the air inlet pipe.
5. The method for molding a bicolor plastic product according to claim 4, wherein the air inlet pipe extends out of the upper part of the mold, and a valve is further arranged at the upper end of the air inlet pipe.
6. The method for molding a dual-color plastic product as claimed in claim 5, wherein in step S2, when the cavity is cooled by injecting the compressed air, the injection of the first plastic into the cavity is continued, and the pressure of the compressed air in the cavity is kept constant.
7. The method for molding a dual-color plastic product as claimed in claim 6, wherein in step S4, the second plastic is continuously injected into the cavity while cooling the second plastic to compensate for the gap formed in the cavity when the second plastic shrinks.
8. The method for molding a two-color plastic product according to claim 1, wherein in step S3, the second plastic is injected from above the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011177133.8A CN112519102A (en) | 2020-10-28 | 2020-10-28 | Method for forming bicolor plastic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011177133.8A CN112519102A (en) | 2020-10-28 | 2020-10-28 | Method for forming bicolor plastic product |
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| Publication Number | Publication Date |
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| CN112519102A true CN112519102A (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011177133.8A Pending CN112519102A (en) | 2020-10-28 | 2020-10-28 | Method for forming bicolor plastic product |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101345A (en) * | 2009-12-22 | 2011-06-22 | 鸿富锦精密工业（深圳）有限公司 | Injection molding method |
| CN108081532A (en) * | 2016-11-21 | 2018-05-29 | 柳道万和(苏州)热流道系统有限公司 | Gases at high pressure assistant formation Shooting Technique |
-
2020
- 2020-10-28 CN CN202011177133.8A patent/CN112519102A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101345A (en) * | 2009-12-22 | 2011-06-22 | 鸿富锦精密工业（深圳）有限公司 | Injection molding method |
| CN108081532A (en) * | 2016-11-21 | 2018-05-29 | 柳道万和(苏州)热流道系统有限公司 | Gases at high pressure assistant formation Shooting Technique |
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Application publication date: 20210319 |
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| RJ01 | Rejection of invention patent application after publication |