July 14, 2022

Two plate mold and Three plate mold

blog aco mold

Two plate mold

Two plate mold is the easiest injection mold structure and has many advantages. It’s consist with A side and B side 2 main parts, when it is load in ejection machine to do molding, A side is fixed and held still, B side is movable. See below figure to get the details of the 2 plate mold.
2 plate mold basic structure

Some of the term explanation:
Location ring: location the filling hole between injection nozzle and sprue, usually made of S55C
Return pin: ensure the ejector pin pull back before the mold close, it protects the injection mold from damage, it’s usually made of SKD61.
Guide pin/ guide bushing: GP and GB are designed for precision guiding so the GP and GB have to be precise themselves.
Ejector guide pin: during ejection, EGP works as guiding to ensure the ejection is correct.
Support pillar: support the B side plate to avoid deformation under high injection pressure.
Spure: allow the melt flow into the cavity.


Two plate mold 3D drawing

Three plate mold

3 plate mold is also named as small gate mold, comparing with 2 plate mold, one of the differences is additional mold plate is required between top clamp plate and cavity plate, which called runner plate, it allows the runner scrap and plastic molded parts released separately, see below figure of three plate mold structure.
Three plate mold structure
3 plate mold structure

Another difference is 3 plate mold require 3 times opening.
The first time opening, see below figure.
First time opening

The second time opening is to release the molded parts, see below figure.
Second time opening

The third time opening is to release the runner automatically.
Third time opening

Three plate mold is usually employed when the part is too big and need multiple injection points. Three plate mold design has more advantages to locate the gate.

But usually 3 plate mold is not recommended as there are some disadvantages, it’s not just because of a much more complex structure but much higher scrap rate, it’s also lack of stability because of complex mechanism. It’s random to use for high volume production because it required longer cycle time and bigger injection molding machine as the run distance is longer comparing with 2 plate mold. If you have any questions about ACO Mold injecction molding, we’ve compiled a list of frequently asked questions for you to read.

Related Blogs

blog aco mold
Benefits of injection molding facility equipping tool room
Without doubt having own fully equipped tool room in plastic injection molding company has huge benefits over the years in terms of winning new customers and not just for injection...
blog aco mold
Analysis of Problems Caused by Non-uniform Wall Thickness
Problems resulted from a non-uniform wall thickness of a plastic injection molded part are more than imagined. This article tries to analyze typical defects resulting from the part design using...

Table of Contents

Tell us your request right now and contact us today about getting started on your next project together!

Email:
sales@acomold.com

Or Fill Out The Contact Form Below:

Support Your Business with Better Molding Solution

Contact Info
Copyright © 2023, ACO Mold. Terms of Service and Privacy Policy. All rights reserved.  Powered by ACO MOLD.
图层 1 1

Get A Free Quote

Please fill in the form below or contact us via email : sales@acomold.com

    1 1.png

    Join Our Network

    Please email to sales@acomold.com
    or fill out the contact form below: