How to use release agent in plastic molds

In the plastic mold manufacturing industry, in order to facilitate demolding, improve efficiency, extend mold life, and make the product surface smooth, size qualified, and reduce waste during the molding of plastic products, demolding agents are needed. 

Release agents can be roughly divided into two categories: external coating and internal addition:

1. The coating type release agent is sprayed on the surface of the mold to prevent adhesion between the product and the mold.

2. Internal release agent is a type of substance added to the molding material. During the vulcanization molding process, it migrates to the surface of the product, thereby playing a role in isolating it from the mold.

Demolding process:

After spraying the release agent on the surface of the mold shell, the actual interface during vulcanization molding is the contact surface between the rubber material and the silicon free release agent on surface A, and the release agent surface isβ The contact surface between the release agent and the mold shell is the C surface; The release agent layer is a cohesive layer. When demolding, it is called interface peeling when peeling off on the A and C surfaces; When peeling off on the B-side, it is called condensed layer failure. 

1. The transfer rate of release agent refers to the percentage of release agent transferred to the formed product during the demolding process.

(1) Peel off the mold from side A without transferring the mold release agent

(2) A small amount of transfer (about 22%) of the release agent occurred due to the peeling off of surface A and the breakdown of the condensed layer on surface B during demolding

(3) Demoulding only occurs due to the destruction of the cohesive layer, with a significant transfer of release agent (approximately 44% -70%)

(4) Demolding caused by detachment of B and C surfaces and damage to the cohesive layer, resulting in a significant transfer of release agent (approximately 93%)

(5) The molded product comes into contact with the release agent, causing mixing and adhesion. When forced to demold, it will cause damage to the surface and interface of some molded products, leading to demolding.

Usually, release agent manufacturers will inform customers that the release agent requires peeling and demolding on the B side or A and B sides. The demolding effect caused by the cohesive layer is the best.