Vad är sprick- och albinoinjektionsdefekter?
Sprickor är en vanlig defekt hos plastprodukter, som främst orsakas av stressdeformation. Det finns främst kvarvarande stress, yttre spänning och spänningsdeformation orsakad av yttre miljö. Som visas i figuren
Analys och eliminering av sprickor och blekning av injektionsdefekter
1) The surface residual stress is too large
Excessive residual stress is the main cause of surface cracking of plastic parts. In the process operation, the process parameters should be set according to the requirements of reducing residual stress of plastic parts. Especially when the temperature of molten material and mold is high and the melt flow performance is good, the injection pressure should be reduced as much as possible. When removing the cracking fault, the methods of eliminating cracks and cracking fault can be referred to.
If there are cracks on the surface of the plastic parts, annealing can be considered to eliminate them. The annealing treatment is to heat the plastic parts fully for about 1 hour at a temperature about 5 degrees lower than the hot deformation temperature of the plastic parts, and then cool them slowly. It is better to anneal the cracked plastic parts immediately after forming, which is conducive to completely eliminating the cracks. dock, it is difficult to eliminate cracks by annealing in mass production, so it is generally not suitable.
Dessutom, due to the residual stress in the crack, if the plastic parts with crack defects are sprayed, the flux in the coating is easy to cause the crack to dissolve and develop into a crack. I detta fall, special attention should be paid to the selection of coatings and diluents that will not cause crack.
2) The surface of plastic parts is affected by concentrated external force
External force is the main cause of surface whitening of plastic parts. I de flesta fallen, the whitening part is always located in the ejection part of the plastic part. Till exempel, in the demoulding process of plastic parts, due to poor demoulding, when the demoulding force on the surface of plastic parts is close to the elastic limit of resin, whitening will occur.
After whitening, the injection pressure should be reduced and the demoulding angle should be increased appropriately, especially the chamfer should be prevented near the stiffener and boss. The ejection device of the demoulding mechanism should be set at the wall thickness of the plastic part or the thickness of the ejection part of the plastic part should be increased appropriately.
Dessutom, the surface finish of the cavity should be improved to reduce the demoulding force, and a small amount of demoulding agent can be used if necessary.
Om JasonMould Industrial Company Limited
Jasonmould är en Kina mögel tillverkare av plastformar- formsprutning, gjutformar, formblåsning av plast, rotationsgjutning, medicinsk formsprutning av plast, två skott formsprutning av plast, insatsgjutning, övergjutning, formsprutning av metall, formsprutning av mikro, formsprutning av pulver, keramisk formsprutning, formsprutning av vätskor, husky formsprutning, hushållsform, gjutform, formverktyg, anpassade formar, porslinformar, snabb prototypverktyg, verktyg för plastprototyp, stanspressverktyg, munstycke och verktyg för mobildelar/ mobiltelefondelar, bildelar, Dammsugare, uppladdningsbara verktyg, telefoner, kopiatorer, datorer, multimediehögtalare, och många andra elektroniska produkter och hushållsapparater. Och även en tillverkare av plastprodukter, mögeltillverkare Kina- plastdelar, vattentank i plast, plastbollar, plastlådor, plastspänne, plastankare, plasthängare, plastsked, rörmontering av plast, tumla av plast, porslin av plast, plastmuggar, plastflaska, plastbricka, kosmetisk behållare av plast, plastfodral, matbehållare av plast, stolar i plast, plastlock, stängning av plastlock, plaströr, vattenledningar av plast, knoppar i plast, plaströr, verktygslådor i plast, plastställ och så vidare.
Kontakt:
Person: James Yuan
Företag: JasonMould Industrial Company Limited
Lägg till: LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong-provinsen, Kina
Tel: 86-752-6682869
E-post: [email protected]
Webbplats: https://www.jasonmolding.com/custom-injection-molding/
