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Super-large size plastic injection moulding process and its equipment

An injection molding, super-large technology, applied in the field of super-large plastic injection molding technology and equipment, can solve the problems of long flow rate of the model, can not solve the problem of single injection point, etc., and achieve the effect of reducing the locking force, reducing the processing cost and reducing the pressure

Inactive Publication Date: 2003-02-05
天津市康库得机电技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings of the existing technology are that the single shot point cannot be solved, the flow rate of the model is too long, and it can only be produced with raw materials.

Method used

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  • Super-large size plastic injection moulding process and its equipment
  • Super-large size plastic injection moulding process and its equipment
  • Super-large size plastic injection moulding process and its equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, the equipment that is especially suitable for the ultra-large plastic injection molding process described in Embodiment 1, including storage injection molding, pre-molding mechanism 1, storage cylinder 2, injection cylinder 3, distributor cylinder 4, storage cylinder 5, injection cylinder 6 , Distributor 7, large manifold 8, hot runner 10, mold 11, movable template 12, reverse push rod 13, press 14, press cylinder 15, take out product car 16, guide rail 17 and hydraulic system; there is also a belt Toothed mold guide post 18, symmetrical toothed push plate 19, system safety discharge valve 21, backing plate 22, integral locking cylinder 20, piston 24, open nozzle a 1 , tappet a 2 , open nozzle cylinder a 3 , Ordinary solid nozzle is large, nitrogen booster pump b 1 and check valve b 2 .

Embodiment 2

[0032] Embodiment 2, ultra-large plastic injection molding process, on the basis of Embodiment 1, the necessary and sufficient conditions for automatic start are: the upper position of the movable template, the rear position of the lock block, the amount of material in the injection cylinder is in place, the closed position of the distributor, and the The product car is at the rear, the open nozzle is sealed by the tappet, and the nozzle oil cylinder is at the front; at this time, the molten material fully mixed with high-pressure nitrogen enters the storage cylinder 5, and the storage cylinder retreats freely.

Embodiment 3

[0033] Implementation 3. Super large plastic injection molding process. On the basis of Embodiment 1 or 2, the automatic process is: automatic start, the movable template is pressed down to close the mold, fast and slow, tooth-shaped push plate clamping, injection cylinder injection, injection Divided into three forms: injection I, injection II and pressure keeping. At the same time, the open nozzle tappet retreats and the nozzle is opened; after injection, the distributor opens, and the open nozzle tappet moves forward at the same time, sealing the nozzle and storing the cylinder. Push it to the front position and self-lock, the injection cylinder fast retreats, the molten material directly enters the injection cylinder, when the injection cylinder reaches the material volume, the distributor is closed, and the storage cylinder moves back freely; when the set cooling time is reached, the toothed push plate opens and moves The template rises and turns quickly at a slow speed; a...

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Abstract

The super-large-type plastic injection moulding process includes the following steps: storage injection, premoulding mechanism is controlled by frequency converter and continuously rotated, general nitrogen gas is passed through pressure pump and one-way valve and pressed into rear portion of screw homogenizing stage and fed into the injection cylinder and storage cylinder together with molten material fully mixed with high-pressure nitrogen gas, if the process is incorrect, the molten material can be discharged out from safe discharge valve of said system. Said technological equipment is characterized by that the storage oil cylinder is connected with storage injection and premoulding mechanism, storage cylinder, injection cylinder and distributer, its one-way valve is connected with storage injection premoulding mechanism.

Description

technical field [0001] The invention relates to a process method and facilities for plastic molding. Background technique [0002] At present, most plastic tray machines at home and abroad are single-point injection, the model flow rate ratio is > 1:150, the injection pressure of the machine is 110MPa, the average cavity pressure is 20-30MPa, the clamping pressure is 30000kN, and the general cost is relatively expensive. [0003] A large-scale plastic injection molding device is disclosed in ZL96207902.2, which mainly includes storage injection molding, pre-molding mechanism, injection cylinder, distributor cylinder, and hydraulic system, storage cylinder, storage cylinder, injection cylinder, distributor, large manifold, Heat flow tube, storage cylinder, mould, movable platen, reverse push rod, press, press cylinder, product take-out car and guide rail are assembled. But the weak point of the prior art is that it still can not solve the single shot point, the flow rate ...

Claims

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Application Information

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IPC IPC(8): B29C45/03B29C45/78
Inventor 王福玲
Owner 天津市康库得机电技术有限公司
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