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Home » Plastic molding » Construction injection mold classification

Construction injection mold classification

July 24, 2020 by mechanicaleng blog Leave a Comment

In this post I will explain construction injection mold classification. Injection mold classification depend on structure plastic parts. If a sample has compound shape, the mold is more difficult than simple shape, and we design mold we need to take care injection machine, number of cavities, plastic material,… of customer.

Post contents

  • I. Follow mold structure, as my opinion, there are 7 classifications of injection mold.
    • 1. Standard mold – two plate mold.
    • 2. Three plates mold.
    • 3. Slider mold.
    • 4. Screw mold.
    • 5. Stripper ejector mold.
    • 6. Split cavity mold.
  • II. Follow runner temperature,  as my opinion, there are two types of mold: hot runner and cold runner.
    • 1. Hot runner mold.
    • 2. Cold runner mold.

I. Follow mold structure, as my opinion, there are 7 classifications of injection mold.

1. Standard mold – two plate mold.

This is very simple injection mold. It decides in two side: cavity side and core side. A cavity makes outside of product, core makes inside of product. It has one parting line, on mold open direction. This mold use in all kinds of plastics that haven’t undercut, inner, screw.

Core side construct to make ejector system.

plastic molding two plates mold
plastic molding two plate mold.

You can read this post for more detail: two plate mold review plastic molding

2. Three plates mold.

A three plates mold has two parting lines. Mold has two opening, one open for gate cutting and one open to open mold and push product out of the mold.

Three plates mold  use to make gate flexibility.

three plate mold construction
three plate mold construction.

You can read this post for more detail: Plastic injection molding three plate mold

3. Slider mold.

This mold use slide parts in carious mold type, slide mold is transfer horizontal movement of mold to vertical movement. The slide part of mold solve undercut of product.

slide core injection molding calculation
slide core injection molding calculation

You can read this post for: Injection molding design construction slide core
Slider cooling channel construction in mold injection

4. Screw mold.

In screw mold, core plate can rotate to push sample out of the mold.

5. Stripper ejector mold.

This mold can solve shape cup without undercut. There are stripper plate between core plate and cavity plate. When mold open, ejector system will push to stripper plate and stripper plate push sample out of the mold.

plastics injection mold construction stripper plate stripper mold
plastics injection mold construction stripper plate stripper mold

You can read this post for more detail: Stripper mold construction | stripper plate

6. Split cavity mold.

The split cavity mold same 2 plate mold but the cavity has split block to make undercut of product or external threads.

This mold will use when slider is not enough to make undercut of the threads.

Because cavity need to open to solve undercut or threads so mold construction is difficult.

II. Follow runner temperature,  as my opinion, there are two types of mold: hot runner and cold runner.

1. Hot runner mold.

2. Cold runner mold.

 

Related posts:

Cooling for slider mold injectionslider cooling channel construction in mold injection three plate mold constructionPlastic injection molding three plate mold slide core injection molding 3D constructionInjection molding design construction slide core plastics injection mold construction stripper plate stripper moldStripper mold construction | stripper plate

Filed Under: Plastic molding Tagged With: injection molding design

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