Mapoinzi matanhatu makuru e pp jekiseni molding

Mapoinzi matanhatu makuru epp jekiseni molding.Kugadziriswa kwepurasitiki mbishi zvinhu kunonyanya kunyungudika, kuyerera, chimiro, uye wozotonhorera muchigadzirwa chakapedzwa. Inzira yekudziisa uyezve kutonhora. Iyo zvakare maitiro ayo epurasitiki anochinja kubva pamapellets kuenda kune akasiyana maumbirwo. Izvi zvinotevera zvinotsanangura kugadzirisa kubva pamaonero ematanho akasiyana. Process.

1. Melting

Iyo heater inobvumira mbishi zvinhu zvimedu kuti zvinyunguduke zvishoma nezvishoma mumvura inoyerera, iyo inonyanya kukodzera kugadziriswa kwekushisa kwezvinhu zvakasiyana-siyana. Kuwedzera tembiricha kuchaita kuti ikurumidze kuyerera kwezvinhu zvakabikwa, iyo inogona kuwedzera kushanda zvakanaka asi inogona kusavimbisa goho. Inofanira kuva yakakodzera Balance.

Pamusoro pe, maitiro akanaka uye hunhu hwepamusoro hwekupisa kwePP kuputika ndekwekuti zvakanakisa kuita kuti zvigadzirwa zvifambe zvakanaka kusvika pakufa panguva yekugadzira kudzivirira kusakwana kuzadza kana kudzoka kumashure.. Kudzokera shure kunoreva kuti kuyerera kwezvinhu mbishi kunokurumidza kupfuura mwero wekubuda. Kuwedzera kweavhareji yekuyerera kushanda kwakaenzana nekuwedzera kweMFR, inova imwe yenzira dziripo dzekugadzirisa, asi zvakare inokonzeresa kugoverwa kweMFR kusiri kujairika, izvo zvinogona kukonzera kusagadzikana kwekuwedzera, izvo zvinogona kuwedzera chiyero chekuremara.

Zvisinei, iyo PP chigadzirwa hachisi chigadzirwa chine huremu hwepamusoro nekuda kwekushandisa, saka kukanganisa hakusi kukuru.

2. Screw

Zvizhinji zve PP kugadzirisa inofambiswa nescrew kutyaira fluidity, saka dhizaini ye screw ine simba guru. Saizi yedhayamita inokanganisa kubuda, uye iyo compression ratio inokanganisa kukosha kwekumanikidza uye kubuda uye mhedzisiro yechigadzirwa chakapedzwa. Izvi zvinosanganisirawo zvinhu zvakasiyana-siyana. (Colour masterbate, additives uye modifiers) mixing effect.

Kuyerera kwezvinhu zvakasvibirira kunonyanya kutsamira pane hita, asi kupisa kunokatyamadza kwezvakagadzirwa kunoburitsawo kupisa kunokatyamadza kukurumidza kuyerera, saka iyo screw compression ratio idiki uye kuyerera kudiki, uye kumhanya kwekutenderera kunofanira kuwedzerwa. Iko kupisa kunopisa kuchave kwakawanda kudarika iyo screw ine yakakura compression ratio.

Naizvozvo, zvinowanzotaurwa kuti hapana tenzi mukugadzirwa kwepurasitiki, uye munhu anonyatsonzwisisa kushanda kwemuchina ndiye tenzi. Kupisa kwezvinhu zvakasvibirira hakusi chete heater, asiwo kupisa kwekupokana uye nguva yekugara.

Saka iri idambudziko rinoshanda, uye ruzivo runobatsira kugadzirisa matambudziko ekugadzira uye kugona. Kana iyo screw inoda kuve neyakanyanya kunaka kusanganisa maitiro, dzimwe nguva-matanho maviri-akasiyana screws kana mapatya-shaft screws akagadzirwa uye akasiyana marudzi e screws akakamurwa kuita zvikamu kuti awane akasiyana musanganiswa mhedzisiro..

3. Mold kana kufa musoro

Plastic reshaping inotsamira pane mold kana kufa musoro. Iyo jekiseni yakaumbwa chigadzirwa ine matatu-dimensional, uye mold yacho yakanyanya kuoma, uye shrinkage inofanira kufungwa. Mamwe acho akati sandara, strip, nemisoro yakaumbwa netsono inoenderera mberi. Kana chiri chimiro chakakosha, Inorongedzerwa sechimiro chakakosha, uye inoda kutarisisa kune dambudziko rekutonhora nekuumbwa nekukasira.

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Mazhinji emichina epurasitiki akagadzirwa semajekiseni ejekiseni, uye iyo extrusion simba inofambiswa ne screw inokonzeresa kudzvanywa kukuru pane zvidiki zvekuburitsa uye kunatsiridza kugadzirwa kwakanaka. Kana musoro wekufa wakagadzirwa senzvimbo yakati sandara, nzira yekugadzira iyo mbishi yakagovaniswa zvakaenzana pamusoro pese pese yakakosha.

4.Kutonhodza

Mukuwedzera kune gedhi resprue rinodurura mbishi, iyo jekiseni mold zvakare ine chiteshi chemvura inotonhorera yekutonhodza iyo mbishi dhizaini. Extrusion molding inovimba nemugero wemvura inotonhorera mu roller kuti iwane kutonhora, kunze kwebanga remhepo, mvura inotonhorera inodururwa zvakananga pahomwe inoputika, uye nzira yekutonhodza yakadai sekuridza maburi.

5.Extension

The reprocessing uye extension yechigadzirwa chakapedzwa chichawedzera mhedzisiro. Semuyenzaniso, bhandi rekusungirira rinofambiswa nemberi nekumashure ma roller nekumhanya kwakasiyana kukonzeresa mhedzisiro yekuwedzera. Kusimba kwekusimba kweiyo yakanangwa yekuwedzera chikamu chechigadzirwa chakapedzwa inosimbiswa uye haisi nyore kubvarura, asi zviri nyore kubvarura munzira yakachinjika. Iyo molecular uremu kugovera kunokanganisawo maitiro ekuwedzera panguva yekumhanyisa kugadzirwa. Zvese zvigadzirwa zve extruded zvinosanganisira mafibers ane akasiyana ekuwedzera. Vacuum uye kuumbwa kwekumanikidza kunogona zvakare kutorwa seimwe nzira yekuwedzera.

6, kupera

Chero raw material ine dambudziko rekuwonyana. Iyo shrinkage inokonzerwa nekuwedzera kwekupisa uye kutonhora kuderera uye kushushikana kwemukati kunogadzirwa panguva yekuumbwa kwekristaro..

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Kazhinji kutaura, kuwedzera kwekupisa uye kuputika zviri nyore kukunda, uye nguva yekutonhora inogona kurebeswa mukugadziriswa, uye kudzvinyirira kunogona kuchengetwa nguva dzose. Crystalline mbishi zvinhu zvinowanzove nehukuru shrinkage misiyano pane isiri-crystalline zvinhu, chinova chinenge chiuru chePP. Gumi nenhanhatu, asi ABS inongoita zviuru zvina chete. Ichi chikamu chekusiyana chakakura kwazvo. Ichi chikamu chinofanira kukundwa pane mold, kana shrinkage kuderedza additives inowanzowedzerwa kukunda ndiro ye extrusion. LDPE inowanzowedzerwa kuvandudza dambudziko remutsipa.