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Method for improving cavity problem in injection-molded thick-walled PPR pipe fittings

A pipe fitting and cavity technology is applied in the field of improving the internal cavity problem of injection-molded thick-walled PPR pipe fittings.

Pending Publication Date: 2020-05-19
WUHAN KINGBULL ECONOMIC DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a method for improving the internal cavity problem of injection-molded thick-walled PPR pipe fittings. The problem of voids in the inner wall

Method used

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  • Method for improving cavity problem in injection-molded thick-walled PPR pipe fittings
  • Method for improving cavity problem in injection-molded thick-walled PPR pipe fittings
  • Method for improving cavity problem in injection-molded thick-walled PPR pipe fittings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Use Haitian injection molding machine (MA3000) to produce "electromagnetic hot-melt integrated equal-diameter pipe sleeve 32", the specific steps are as follows:

[0020] 1. Install the forming mold on the injection molding machine, and connect the mold temperature controller to the circulation pipeline of the forming mold through the water pipe, and control the temperature of the liquid in the circulation pipeline of the forming mold to 45°C through the model machine;

[0021] 2. Heating the barrel of the injection device, so that the temperature in the barrel of the injection device reaches the preset temperature, adding the raw material into the barrel of the injection device, and the raw material is heated and melted to become a fluid melt;

[0022] 3. After the mold clamping is completed, the fluid melt is injected and filled into the molding cavity of the molding mold through the injection device;

[0023] 4. After the injection filling is completed, keep the pres...

Embodiment 2

[0035] Haitian injection molding machine (MA3600) is used to produce "electromagnetic hot-melt integrated equal-diameter tee 32", the specific steps are as follows:

[0036] 1. Install the forming mold on the injection molding machine, and connect the mold temperature controller to the circulation pipeline of the forming mold through the water pipe, and control the temperature of the liquid in the circulation pipeline of the forming mold to 55°C through the model machine;

[0037] 2. Heating the barrel of the injection device, so that the temperature in the barrel of the injection device reaches the preset temperature, adding the raw material into the barrel of the injection device, and the raw material is heated and melted to become a fluid melt;

[0038] 3. After the mold clamping is completed, the fluid melt is injected and filled into the molding cavity of the molding mold through the injection device;

[0039] 4. After the injection filling is completed, keep the pressure...

Embodiment 3

[0050] Haitian injection molding machine (MA4500) is used to produce "electromagnetic hot melt integrated 90 degree elbow 32". The specific steps are as follows:

[0051] 1. Install the molding mold on the injection molding machine, and connect the mold temperature controller to the circulation pipeline of the molding mold through the water pipe, and control the temperature of the liquid in the circulation pipeline of the molding mold to 60°C through the model machine;

[0052]2. Heating the barrel of the injection device, so that the temperature in the barrel of the injection device reaches the preset temperature, adding the raw material into the barrel of the injection device, and the raw material is heated and melted to become a fluid melt;

[0053] 3. After the mold clamping is completed, the fluid melt is injected and filled into the molding cavity of the molding mold through the injection device;

[0054] 4. After the injection filling is completed, carry out pressure ho...

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Abstract

The invention discloses a method for improving the cavity problem in injection-molded thick-walled PPR pipe fittings. The method comprises the steps that 1, a molded die is installed on an injection molding machine, the molded die is connected with a mold temperature controller, and the temperature of the molded die is controlled to be 40-70 DEG C through the mold temperature controller; 2, a charging barrel of an injection device is heated to reach the preset temperature, and raw materials are added into the charging barrel of the injection device and heated into fluid melt; 3, after the moldclosing is completed, a molding cavity of the molded die is filled with the fluid melt by injection; 4, after the injection filling is completed, the pressure maintaining is performed, the first-stage pressure maintaining pressure is 30-90 Pa, the first-stage pressure maintaining time is 30-70 s, the first-stage pressure maintaining speed is 10-55 cm<3> / s, the second-stage pressure maintaining pressure is 30-90Pa, the second-stage pressure maintaining time is 30-70s, and the second-stage pressure maintaining speed is 10-55 cm<3> / s; and 5, after the pressure maintaining is completed, cooling is performed, the cooling time is 180-300s, mold opening is performed after cooling, and PPR pipe fittings are obtained. The method is simple and convenient to operate, and can effectively improve theproblem of cavities generated in the inner walls during the molding of thick-walled PPR pipe fittings.

Description

technical field [0001] The invention relates to the technical field of injection molding, in particular to a method for improving the internal cavity of injection-molded thick-walled PPR pipe fittings. Background technique [0002] In the production of injection molded PPR pipe fittings, especially thick-walled PPR pipe fittings with a wall thickness greater than or equal to 3mm, due to the fluidity of the material and post-shrinkage, internal voids are easily generated in the pipe fittings, and the internal void problem has a great impact on the pressure bearing capacity of the pipe fittings. , which has seriously affected the product quality. For users, the use of such PPR pipe fittings with inner wall holes may easily cause hidden dangers of water leakage. Contents of the invention [0003] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a method for improving the internal cavity problem of injection-molded thick-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/77B29C45/00B29C45/78B29C45/76B29C45/73B29C45/74B29K23/00B29L23/00
CPCB29C45/0001B29C45/73B29C45/74B29C45/76B29C45/77B29C45/78B29K2023/14B29L2023/00
Inventor 陈厚忠
Owner WUHAN KINGBULL ECONOMIC DEV
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