Unlock instant, AI-driven research and patent intelligence for your innovation.

Injection molding method for foamed plastic and equipment thereof

A technology of injection molding and foaming plastics, which is applied in the direction of coating, etc., can solve the problems that cannot overcome the excessive fluctuation of material pressure, achieve the effects of small pressure fluctuation, reduce maintenance cost, and improve production efficiency

Inactive Publication Date: 2009-10-14
UNION PLASTIC HANGZHOU MACHINERY
View PDF2 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But neither of them can overcome the disadvantage of excessive fluctuation of material pressure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Injection molding method for foamed plastic and equipment thereof
  • Injection molding method for foamed plastic and equipment thereof
  • Injection molding method for foamed plastic and equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Refer to attached figure 1 , 3 :

[0034] The foamed plastic injection molding method of the present invention comprises the following steps:

[0035] (1) Heat the plastic into a molten state, pressurize and inject gas or foaming agent, and stir to dissolve the gas or foaming agent into the plastic melt to form a single-phase, non-nuclear, uniform material liquid;

[0036] (6) Introduce the aforementioned feed liquid into a storage barrel;

[0037] (7) Carry out back pressure control to described accumulator barrel, according to the moving position of the extruding piston of the hydraulic cylinder of described accumulator barrel, do the control of different pressures of more than one section;

[0038] (8) injecting the hydraulic pressure of the material suitable for the capacity of one injection into the injection barrel, and controlling the back pressure of the material liquid in the injection barrel, while maintaining the back pressure control in the cavity of the ...

Embodiment 2

[0048] Refer to attached figure 2 , 3 :

[0049] The difference between this embodiment and the first embodiment lies in the improvement of the storage barrel 2 and the injection barrel 3, and the rest are the same as the first embodiment.

[0050] The storage barrel 2 has the following structure: a first annular bearing seat 24 is installed in the chamber of the storage barrel 2, the first piston rod 25 is slidably installed in the first annular bearing seat 24, and the first piston The rod 25 is in sealing fit with the first annular support seat 24, there is a gap between the first piston rod 25 and the cavity wall, and the material inlet of the cavity is close to the first annular support seat 24; the rear part of the first piston rod 25 Cooperate with oil cylinder 21, oil cylinder 21 trigger switch.

[0051] The injection barrel 14 has the following structure: a second annular support seat 34 is installed in the injection chamber of the injection barrel 3, a second pis...

Embodiment 3

[0056] Refer to attached figure 1 , 2 , 3:

[0057] The difference between the present embodiment and the second embodiment is that the stirring device 6 of the injection barrel 3 is added. The rest of the second embodiment is the same.

[0058] The front end of the injection barrel 3 is connected to the nozzle 5 through the stirring device 6 . The stirring device 6 may be of impeller type, or other commonly used fluid channel stirring devices.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an injection molding method for foamed plastic, which comprises the steps of forming foamed plastic melt liquid, inpouring into a storing machine barrel, inpouring into an injecting machine barrel, injection molding, and adjusting the extruder output of the storing machine barrel. The injection molding equipment for foamed plastic comprises a feeding machine barrel which is connected with a gas transmission device, a hopper and a heating device and internally provided with a screw; the front end of the cavity of the feeding machine barrel is communicated with the cavity of the storing machine barrel; the storing machine barrel is connected with a first numerical back pressure valve which is connected with a central controller and carries out pressure control on a hydraulic cylinder; the storing machine barrel is communicated with the injecting machine barrel through a check valve; the front end of the injecting machine barrel is provided with a nozzle; and the injecting machine barrel is connected with a second numerical back pressure valve which is connected with the central controller and carries out pressure control on a pipe bending cylinder. The invention has the advantages of continuous running screw, small feed liquid pressure fluctuation and simple and convenient control method.

Description

(1) Technical field [0001] The invention relates to a method and equipment for injection molding of foamed plastics, mainly referring to the production of foamed plastics by means of the injection molding method and device. (2) Background technology [0002] The molding of foamed plastic is generally to feed plastic and inject gas into a feeding pipe equipped with a screw at the same time. The feeding pipe is equipped with a heating device to melt the plastic. Under the stirring of the screw, the melted plastic and gas are fully dissolved to form a single Phase, non-nuclear, homogeneous plastic melt containing gas. The molten liquid is output from the front end of the feeding pipe, cooled and formed after passing through the mold. No. USP4,344,710 proposes foamed plastic technology with alkanes and carbon dioxide as blowing agents, and USP4,473,665 discloses the application of foamed plastics. No. USP4,424,287 proposes a foaming technique in which pentane and carbon dioxid...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B29C44/02B29C44/34B29C44/60B29C44/42B29C45/00B29C45/03B29C45/46B29C45/53B29C45/77B29C45/18
Inventor 陈文魁
Owner UNION PLASTIC HANGZHOU MACHINERY