TPE Overmolding and Bonding

Design engineers choose TPEs for improved ergonomics, enhanced grip performance, improved aesthetics, and critical impact protection. Applications that benefit from TPE overmolds range from consumer goods to medical insruments to industrial tools and can include knobs, handles, gaskets, seals and grips.Benefits of Overmoldingtoothbrush.

With improvements in TPE materials technology, overmolded part designs have become less dependent on mechanical interlocks to hold a TPE in place. Chemical bonds between TPE and rigid materials offer improved part integrity and longevity while eliminating the need for adhesives or surface pre-treatments. System performance can be further optimized by including both chemical and mechanical bonds in the part design. The net benefit is greatly expanded design freedom.

Chemical bonds in Overmolding:
Improve product function
Increase margins
Expand product differentiation
Enable new design innovation

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Drying temperature and drying time of TPE materials

Water absorption of TPE materials is very small,about 0.3-0.5%.In the ordinary way Drying is not required under injection molding directly.For some products which need overmolding,you should need to dry it before Production and processing,such as after prolonged storage to achieve best results use on dry 2 hours at 70℃ .

Drying temperature and drying time of TPE materials:
TPE: hardness:30-60 shore(A),Drying temperature:60-70℃，drying time：1-2h.
TPE: hardness:70-100 shore(A),Drying temperature:70-80℃，drying time：1-2h.
The general principle of drying: higher hardness of TPE,higher Drying temperature,longer drying time.

How temperature influence the processing of TPE adhesion to ABS ？？

It is very common for TPE adhesion to ABS. On the premise of no problem for the equipment and mould. Temperature is the main infuential factor of injection molding processing.

some time ago, i have follow a client who look for TPE materials adhesion ABS. His product is a button(size:80 mm long,20 mm wide, 2~3mm Thickness, Main material is ABS) so he want some TPE materials to adhesion to this button in order to get better soft feeling.

First step, i take some button samples to our engineers for testing. according to the result, they provide me a TPE materials(hardness:50A,specific gravity:1.07) with Good mobility. I carried these sample to my client's factory for testing the sample.

second step: the processing of testing. First time, their engineer adjusted the temperature of machine to 190℃ but the result is very bad because of the product deformation. Second time,185℃，the result is better than first time. Third time, it is perfect.

Analysis summary: the reason of Product deformation is too much higher temperature during processing of overmolding and too fast speed of open mould. The concrete problem need a concrete analysis-GainShine TPE

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