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Application of Dehumidifying Dryer in the Processing of Spectacle Frame Material

source：Central feeding system
Author：Central feeding system
time：2020-09-03 15:19:06

It is very important to fully dry to a moisture content of less than 0.1%, otherwise the injection molded products will be whitish (gas white fog), yellow, foam, silver, brittle, unsightly appearance, and poor mechanical properties , And the loss of raw materials is large.

Only produce when the humidity is less than 50%.

3. If it is fully dried and the plastic part is still white, the injection temperature of the barrel needs to be increased to make the raw material fully plasticized.

Injection process

1. Drying:

(1) Dehumidifying dryer below 90~110℃. Dry for 2~4 hours (the dryer must be installed on the injection molding machine)

(2) Oven below 100~110℃. Dry for 3~6 hours (Note: the original package material does not need to be dried if the package is not broken)

2. Inject the abrasive

3. Cooling and forming

technical parameter

Barrel temperature: feed section: 230~240℃; middle section: 235~245℃; discharge section: 245~250℃; nozzle: 250~260℃; mold temperature: 60~100℃

Injection pressure: 80~110mpa

Molding cycle: 20~25s

Screw speed: 30~60 r/min