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Dimensional instability of products in injection moulding

Posted by: Mu Ju 2021-10-30 Comments Off on Dimensional instability of products in injection moulding

Instability of product dimension means that the dimension change of moulding parts exceeds tolerance limit. The reason may lie in injection moulding machine, injection moulds and injection moulding process.


(1) Injection Moulding Machine


The application of different types of injection moulding machines results in the difference of injection moulding conditions.


(2) Temperature fluctuation – check the faults of thermocouples or temperature controllers;


(3) Instability of screw speed – check hydraulic system;


(4) Unstable injection pressure – check whether there is a consistent buffer in each cycle, or whether the plastic check valve leaks, and repair or replace it if necessary;


(2) Injection Mould


(1) Check whether the gate is blocked by residue;



(2) Check whether the temperature of injection mould is stable, whether the coolant is smooth and whether the cooling circuit is connected correctly;


(3) Check the failure of forming parts;


(3) Injection Moulding Technology


(1) The temperature of injection mould is not uniform or the cooling circuit is unreasonable, which leads to the improper temperature control of injection mould – making corresponding apintejinustments;


(2) The injection pressure is too low – increase the injection pressure;



(3) Increase injection time and heat preservation time appropriately;


(4) The barrel temperature or the nozzle temperature is too high – make corresponding apintejinustments;


(5) too low injection speed – increase injection speed.



About PTJMould Industrial Company Limited


PTJmould is a China mold maker of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer, mold manufacturer China– plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.

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