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What is plastic mold?

The tooling used for plastic injection molding is called plastic mold or plastic injection mold.

Most plastic products are molded by plastic molds.

Plastic molds are divided into two types: thermosetting and thermoplastic mold ,according to the molding plastic characteristics.

plastic mold

Based on the molding process, the plastic mold is divided into

plastic injection mold,
blow mold,
casting mold,
pressing mold,and so on.

The injection mold is made up of two main sections: the moving half and the fixed half.

The moving half is mounted on the moving platen of the injection molding equipment, and the stationary half is mounted on the stationary platen.

Over the injection molding, the moving and the stationary half are shut to develop an injection structure and a cavity structure.

Once the mold is open, the moving half and the stationary half are split up to clear away the plastic item from the plastic mold.

As a way to decrease the mold design and developing period, the majority of the plastic molds work with standard mold bases.

The injection system and the part forming system are in direct contact with the plastic and they change with the different plastics and products.

Those 2 systems are the most complex and most varied parts in the mold and require the highest finish and accuracy.

The part-forming process refers to the melted plastic heated by injection molding machine is injected into the mold cavity.

After cooling and solidification, it get the molded products.Which simplifies as :mold close – injection – pressure – cooling – mold open – ejection.

What is plastic mold?

The plastic injection mold is generally composed of the following parts:

mold base: generally choose standard mold base from standard mold base manufacturing factory , such as LKM,DME,HUSCO…
mold insert: it is used to form plastic products, plastic mold factory normally makes it by itself, most of the processing time is spent on the producing mold inserts.
mold auxiliary parts: they include location ring, nozzle bushing, support pillar, ejector plate, guide bushing, guide pin, lifting ring and so on.
the four major systems:
1) Injection system: The injection system refers to the flow path part before the melted plastic enters the cavity from the nozzle, including the main runner, the cold slug, the sub-runner and the gate.It is directly related to the molding part quality and production efficiency.
2) ejection system: ejector pins, blade pins and sleeves.
3) heating and cooling system: hot runner, pre heating device, cooling water;
4) venting system: venting slot, parting surface venting, ejector pin venting and insert venting;
special mechanism: if the product has the undercut or side wall hole , the plastic mold needs to design the side core pulling mechanism (also called the slide), the inclined core pulling mechanism (also called the lifters), the oil cylinder (when the side core pulling distance is long).

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