Known problem in rubber moulding: Chunking | Solution: Chem-Trend release agent

Rubber Chunking

What it is

Rubber chunking occurs when rubber erroneously adheres to the mould as it is being extracted from the mould. This leaves a void in the product being made as well as leaving residue in the mould, affecting both part and process.

What causes it

In a rubber-bonding environment, adhesives give off gasses onto the mould surface, causing the rubber to adhere (bond) to the mould. Chunking typically happens when the rubber-to-rubber bond is weaker than the rubber-to-mould surface bond, which the release agent is there to prevent. Adhesive off-gassing occurs in the closed mould when adhesive on a substrate is heated to the point of becoming a gas. If there is no rubber present in the cavity during this time, the adhesive will then transfer and bond to the mould. This most often happens in an injection moulding or transfer moulding environment.

Solutions

A good release agent will help prevent adhesive transfer to the mould (staining), eliminating chunking issues.

The switch from 3 to 1 completely water-based release agent leads to less mould build up, the elimination of VOC and less cleaning resulting in lower costs and higher part quality.

Reduced mould fouling in silicone rubber seal production

Let Us Help You Solve It

We’re here to help. Just fill out this form to get started.

Country / Territory:*

State/Province:

City:

Company:*

First Name:*

Last Name:*

Email Address:*

Telephone:

Application/Need:*

Topic:*

Message:*

This field is for validation purposes and should be left blank.

By clicking the “Submit” button, I acknowledge that I was informed about the processing of my personal data according to the Privacy Policy of Chem-Trend.

Rubber Chunking

What it is

What causes it

Solutions

RELATED CASE STUDIES

New release agent successfully reduces clogging of the spray system.

Manufacturer of transmission belts relies on new water-based release agent.

Release agent from Chem-Trend enables a huge step forward in shoe soles production.

The switch from 3 to 1 completely water-based release agent leads to less mould build up, the elimination of VOC and less cleaning resulting in lower costs and higher part quality.

Reduced mould fouling in silicone rubber seal production

Global translations:

Regional websites:

Notice