Shanghai Daoqin Plastics Co., Ltd.

injection molding processing in improvement plastics products gloss degree and Color Difference methods 包括两方面,
一方面 is improve/increase plastics products surface gloss degree, is increase modified, 另一方面 is reduce plastics products surface gloss degree, is light modified. versus for 说, increase technology more is main/primary. plastics increase improve/increase plastics products surface gloss degree or light degree, specific methods remove raw materials combined 理选取 outer, also has add increase method, blending increase method, control increase method, molding equipment light degree control, processing increase method and surface coating increase method and other.
1, resin selection resin 本身 特征 for plastics products surface gloss degree effect/influence relatively large, is control plastics products surface gloss degree most has methods. its for versus plastics products surface gloss effect/influence main/primary 取决于如 lower several 方面: (1) resin product types different resin product types versus products gloss property large same, generally is lower resin for products gloss property comparison good: amine resin, ABS, PP, HIPS, PA, POM, PMMA and PPO and other, its in amine resin and ABS两 types gloss property most 突出. for types resin 而言, combined formed methods different, its resin for products gloss degree same. 例如: a, for PP而言, different polymerization methods combined formed product types gloss degree large small lower: random copolymer PP> homopolymer PP>嵌段 copolymer PP. b, for PE 而言, types different product types gloss degree large small lower: LDPE>LLDPE>HDPE. C, for PVC而言, emulsion method PVC resin ratio method PVC resin gloss degree high. d, for/regarding PS resin 而言, high impact resistance poly ethylene (HIPS) gloss degree large general purpose polystyrene (PS) (GPPS) (2) resin features for types resin 而言. its specific features different, gloss degree same, in resin features in for gloss degree has effect/influence features main/primary has lower types. a, melt flow rate (MFR) generally large, its versus products gloss degree large. b, molecular weight effect/influence molecular weight 影Ⅱ toward main/primary in molecular weight distribution wide degree upper. molecular weight distribution wide, its versus products gloss degree decline. this main/primary is is molecular weight distribution wide, material 不规整 property increase large. c, water absorption effect/influence water absorption high resin, water absorption for its versus products gloss degree effect/influence relatively large. separation in has ester 基(一COOR) and amine 基(一CONH2) PA, PI, PSF and PC and other, 如不进行 drying or drying 不彻底, in products surface water 波纹, bubbles, silver streaks, 斑纹, and other, from make surface gloss degree large large decline. 2． additives selection in has plastics use additives in, for gloss degree effect/influence most large is filler; its also has increase agent, stabilizer and flame retardant and other, effect/influence relatively small. (1) filler effect/influence filler for gloss degree effect/influence can separation is lower several 方面: a, filler product types different filler product types for gloss degree effect/influence different. remove glass beads outer has filler make filling products gloss degree decline, is decline degree different already. types filler for filling products gloss degree effect/influence large small 次序如 lower: metal salt > glass fiber < slip powder <云母. b, filler filler pellets micro different, for filling products gloss degree effect/influence different, its effect/influence large small is: 球状<粒状<针状< sheet/slice 状. c, filler degree, filler degree small, filler products gloss degree decline degree small. another, filler degree distribution wide degree large small different, for filling products gloss degree effect/influence different. its effect/influence is: filler degree distribution wide, filling products surface gloss degree low. this main/primary is is filler degree scope/range versus large, filling products surface 越凸凹不平, light easy generate 漫反射 phenomenon. d, filler filling amount filler filling increase large, filling products surface gloss degree reduce. 以CaC0. filling PP system is 例, CaC0. filling amount is 5％时, filling products surface gloss degree is 5O％. CaC0. filling amount is 15％ 时, filling product gloss degree decline is 32％.

二, injection molding product Color Difference control Color Difference is injection molding in Common defect, Color Difference effect/influence factors more, and raw materials resin, masterbatch, masterbatch raw materials mixed combined, injection molding process , injection molding machine and other, in production process in generally from below/following 五 方面 进行 Color Difference control.
1．消 remove injection molding machine and mold factors effect/influence need selection and injection molding product amount versus injection molding machine, if injection molding machine in material material and other issues, most good more equipment. for/regarding mold system, gas and other formed Color Difference, can through versus separation mold repair solution. must solution good injection molding machine and mold issues can production, decrease issues complex property. 2消 remove raw materials resin, masterbatch effect/influence control Raw Materials is solution Color Difference key/critical. therefore, especially is production shallow color products 时, can overlook raw materials resin heat stabilized property different for products color 泽波动 belt/tape obvious effect/influence. large more injection molding production 厂家本身并不 production plastics material or masterbatch, this 样, can will attention/notes 焦点放 in production tube/pipe and Raw Materials upper. add strong/high Raw Materials 入库 检验; production in product can can using/adopting 同一厂家, grade material, masterbatch production; for/regarding masterbatch, in amount production front need 进行抽检试 color, need upper for, also need in in comparison, if color versus large, can is combined 格, batch masterbatch has light micro Color Difference, can will masterbatch heavy new mixed combined rear again use, decrease/reduce masterbatch mixed combined 不均造 formed Color Difference. meanwhile, also focus/key point raw materials resin, masterbatch heat stabilized property, for/regarding heat stabilized property 不佳, 我们建议厂家进行调换. 3． decrease/reduce material temperature degree for Color Difference effect/influence production in 常常会遇 to certain add hot loss bad 失效, or is add hot control separation long formed material temperature degree 剧烈变化 from generate Color Difference. this category of causes generate Color Difference very easy 判定, generally add hot loss bad generate Color Difference meanwhile 会伴随 塑化不均 phenomenon, add hot control separation long 烧常伴随 product gas 斑, heavy color 甚至焦化 phenomenon. therefore production in 需经常检查 add hot separation, add hot separation loss bad or 失控时 and more repair, decrease/reduce this category of Color Difference generate rate. 4． decrease/reduce injection molding process adjustment effect/influence non Color Difference causes adjustment injection molding process parameters 时, can can 不改变 injection molding temperature degree, back pressure, injection molding cycle and masterbatch add amount, adjustment meanwhile also 需观察 process parameters for color effect/influence, 如发现 Color Difference and adjustment. can can use high injection speed degree, high back pressure and other strong/high function injection molding process, anti local hot or hot separation understanding and other factors formed Color Difference. control material add hot temperature degree, especially is nozzle and nozzle add hot separation. ． 5．掌握 material temperature degree, masterbatch amount for product color effect/influence in Color Difference adjustment front also must product color temperature degree, masterbatch amount trend. different masterbatch production temperature degree or masterbatch amount 改变, its product color 变化规律 is different. can through color process its 变化规律. remove non already this type of masterbatch color 变化规律, 否则不 can can very fast good Color Difference.