Extrusion & Post
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Gel Particles/Gel Granules Appearing in Polypropylene Film
Problembeschreibung
Transparent or translucent granular gel particles can be seen in the film, affecting the appearance and transparency of the film.
Gel particles are insufficiently plasticized resin or cross-linked gel, and are especially obvious in transparent films.
Ursachenanalyse
(1) The high molecular weight components in the raw material are not fully plasticized
(2) The extrusion temperature is too low
(3) The mixing effect of the screw is insufficient
(4) The raw material contains cross-linked gel
(5) The filter screen mesh is not fine enough
Lösung
(1) Increase the extrusion temperature to the higher value within the range of 200-280°C
(2) Optimize the screw design and add mixing elements
(3) Select high-quality raw materials with low gel content
(4) Increase the filter screen mesh to 80-120 mesh
(5) Regularly clean the screw and die to prevent the generation of carbonized matter
Wichtigste Erkenntnis
Gel particles are caused by insufficient plasticization or raw material quality problems, and need to be solved from temperature control and raw material quality.
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