|Additives are available for the following criteria. Release is not the main issue, thermoplastics do not tend to stick, however for extreme polymers we have additives to facilitate this.
RELEASE AGENTS FOR THERMOPLASTICS
For many years WURTZ release agents are used with the best results for the processing of all kinds of thermoplastics. These products guarantee optimum releases without adverse secondary effects.
There are two possibilities to improve the unmoulding of thermoplastics:
The second possibility means mixing of the internal release agent (mostly powder) to the granulate.
The dosage of the internal depends on facts, like geometry of articles, fillers, etc. Normally the dosage varies between 0.01 and 0.3%. For first trials we recommend to add 0.2%
Besides an excellent release effect internals offer the following advantages:
Better dispersion of fillers, glass fibres or pigments (no stripes) in the polymer resulting in a better quality of the finished articles.
Better flow properties, complicated mould structures are filled quicker and easier (faster cycles); reduction of injection pressure is possible.
Less friction between pommel resp. screw and cylinder effects reduced energy consumption of the processing machine at constant production capacity.
The attached list shows recommendations for the various polymers.