What causes the lack of gloss in the processing of mold products?


What are the reasons for the large surface roughness an […]

What are the reasons for the large surface roughness and lack of gloss in the processing of mold products? Next, Jimei Mold Factory will give you a good analysis from the aspects of mold processing equipment, injection molds, plastic molds, mold processing technology and raw materials.

1. As far as the mold processing equipment is concerned, it is most likely to be caused by insufficient material supply, resulting in the processed products not meeting the standard.

2. For injection molds and plastic molds, it may be because Bucket mould  the gate is too small or the runner is too thin, such as poor polishing, mechanical abrasion, damp mist, rust not cleaned, etc., resulting in a fine surface Concave and concave, poor exhaust: no cold slug well, etc.

3. In terms of mold processing technology, there are mainly the following four points.

(1) The barrel heating is uneven, the barrel temperature is too high or the material temperature is too high, and the mold temperature is too low, which causes the rubber injection molded parts to condense and harden on the surface of the cavity prematurely and leave the mold surface, and the surface roughness of the cavity cannot be reproduced. , Tarnished.

(2) The injection pressure is low, the injection speed is too slow, and the injection time is insufficient, resulting in poor sealing of plastic processing parts, affecting gloss,

(3) The injection rate is too large or too small.

(4) The cooling time is too short, and the plastic injection molded parts are not cooled enough to make the surface fade. At this time, the gate should be increased, the injection mold temperature should be reduced, and the cooling time should be increased

4. In terms of raw materials

(1) The raw materials are not dried and contain volatile substances, which are easy to agglomerate on the surface when encountering a cold cavity, which prevents the melt from being in close contact with the mold surface.

(2) Plastic degradation affects the color tone.

(3) Excessive amount of auxiliary or mold release agent or poor quality, mixed with dust, causes the plastic injection molded parts to become fuzzy and dark, and pits.