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Shenzhen WT Hardware and Plastics Limited

contact:Henry yang

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Tel: +86-755-27673590, 23143539
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Add: 5B2, Jiangshi Building, Fuyong, Shenzhen, China
http://www.wt-mold.com/
Email: henry@wt-industry.com
Our main products: Injection Mold, Molding Parts, Die Casting Mold, CNC machining of high quality

             

Effect of mold temperature control on injection molding
May 10, 2018

Effect of mold temperature control on injection molding

In general, the increase of mould temperature can reduce the condensation layer in the mold cavity early in the mold cavity, so that the molten material is easier to flow in the cavity, thus the weight of the parts and the better surface quality are obtained. At the same time, the increase of mold temperature will increase the tensile strength of parts. Many moulds, especially the thermoplastic plastics used for engineering, run at relatively high temperatures. If the mold is not insulated, the heat lost to the air and the injection molding machine can easily be as much as the loss of the ejecting cylinder.

Therefore, mold and machine plate insulation, if possible, the mold surface insulation. If the hot runner mold is considered, try to reduce the heat exchange between the hot runner part and the cooled injection molded part. This method can reduce energy loss and warm-up time.

The necessity of temperature control

(1) the purpose and action of temperature control to formability

The appearance, physical and physical properties, forming cycle of molded products are significantly affected by the temperature of die. In general, the mould kernel temperature is kept low, and the number of ejection times is more ideal, but the forming cycle related to the shape of the forming product and the type of finished material depends on the need to improve the temperature of the mold filling.

(2) to prevent the stress from being controlled by the temperature

This is the material problem of forming materials, which requires only cooling rate. When the cooling time is very short, even if a part of the hardening part is soft, the stress caused by uneven shrinkage can be avoided. That is, proper temperature control can improve the properties of cooling stress.

(3) temperature control for the adjustment of the crystallizing degree of the forming material.

Polycrystalline sulphur (nylon), polyvinyl acetate, polypropylene and other crystalline materials regulate the degree of crystallization and improve the mechanical properties.


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