Composite (co) injection molding

Composite (co) injection molding composite (co) injection molding composite (co) injection molding

The compounding technology is actually the integration of various processes or technologies, and its main purpose is to shorten the production cycle of the products and increase the added value.

Co-injection molding helps to observe the unique structure of the part. Figure 1-2 is a schematic view of a co-injection molding process of a flat disc.

The POM plastic "A" is first injected into a portion of the cavity, and then the plastic "B" is followed by an "A" injection into the cavity and maintains the initial push flow pressure field.

According to the size of the skin area and the core area, the amount of material used for "A" and "B" is measured in the correct proportional relationship.

A part with an inner core layer of "B" outer surface completely wrapped by "A" can be obtained. The cross section is shown in Figure 1-2.

The British ICI company was as early as the 20th century. The application of this technology began in the ages, and several patents including basic theory, production products and machinery and equipment were obtained.

The ICI production process is now commonly used like a “sandwich model.” The outer layer differs from the chip material in that it requires a certain degree of compatibility. Material selection is especially important.

Sandwich injection molding differs in the injection of each injection unit. The melt entering the cavity first forms a skin layer. The melt that enters later forms a core layer.

Sandwich injection molding has now evolved from a single flow path to a two-pass, three-pass process.

The single flow path process uses two valves from one position to another through the reversing valve to enter the cavity.

Up to now, the composite technology mainly includes: multi-color injection molding, multi-material injection molding, on-line one-line combination insert injection molding, film insertion and veneer internal molding.

The article is from Jiaxin Plastic Network:
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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