Have You Encountered The Following Problems When Developing Products?

The following is one of our cases

This is stove/heater door handles, one of the featured quality products we have been producing for our famous client of stove/heater manufacturer in Sweden for years.

We help them complete the whole mass production from the stamping of components from carbon steel, used for body structure, insert molding by bakelite injection, sandblasting to rubber paint spraying.

However, it was never an easy case as it seems that at the beginning of the stage for insert molding or later coating process, we encountered several difficulties for us or our client to solve than ever expected.

Unlike most of the bakelite products, the appearance of these elegant door handles for exquisite stove/heater is required to meet a high standard.

In order to solve problems of merging bakelite and carbon steel causing detachment or not completely wrapped, or worse, cracks on the surface, it is relevant to carbon steel’s tension and different shrinkage of two as well as the strength of the whole structure during or after insert molding, we not only studied and dedicated to trying many brands of bakelite for the most appropriate one, but we also attempted to adjust parameters and molds in accordance with attributes to eventually combine them perfectly. Yet, another challenge comes after each successful combination, which is rubber paint is not easy to adhere to the surface for some reason. Before, as most of the bakelite finished products we produced are used to be used as mechanical parts, we did not have experience of encountering such a problem. After a few tests from digging into the cause, we then realized a membrane produced at the exterior layer of the surface after totally formed should be intentionally damaged to expose rough structure inside. So, prior to the coating process, we send semi-finished products to do sandblasting to make the surface uneven first.