Inqubo yokubumba umjovo we-Acrylic

I-Acrylic ngamakhemikhali ibizwa nge-polymethyl methacrylate (PMMA ngesiNgisi). Ngenxa yokushiyeka kokuqina kobuso be-PMMA, ukunwaya kalula, ukumelana nomthelela ophansi, ukubumbana okungalungile, njll., ukuguqulwa kwe-PMMA kuvele ngokulandelana. Okufana ne-copolymerization ye-methyl methacrylate nge-styrene ne-butadiene, ukuhlanganiswa kwe-PMMA ne-PC, njll.

Ukugeleza kwe-PMMA kubi kakhulu kunokwe-PS ne-ABS, futhi i-viscosity encibilikayo izwela kakhulu ekushintsheni kwezinga lokushisa. Ngesikhathi se- inqubo yokubumba, i-viscosity encibilikayo ishintshwa ngokuyinhloko kusukela ku- izinga lokushisa lomjovo. I-PMMA i-amorphous polymer enezinga lokushisa elincibilikayo elingaphezu kuka-160°C kanye nezinga lokushisa lokubola elingu-270°C..

1. Ukucubungula kwepulasitiki

I-PMMA inezinga elithile lokumuncwa kwamanzi, ngezinga lokumunca amanzi 0.3-0.4%, futhi umswakama wokubumba umjovo kufanele ube ngaphansi 0.1%, ngokuvamileyo 0.04%. Ukuba khona kwamanzi kubangela amagwebu, imigqa yegesi, nokuncipha kokungafihli ekuncibilikeni. Ngakho idinga ukomiswa. Izinga lokushisa lokumisa lingama-80-90 ℃, futhi isikhathi singaphezu 3 amahora. Izinto ezigaywe kabusha zingasetshenziswa 100% kwezinye izimo. Inani langempela lincike ezidingweni zekhwalithi, ngokuvamile kuphelile 30%. Recycled materials should avoid pollution, otherwise it will affect the transparency and the properties of the finished product.

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2. Umjovo udini umshini selection

PMMA has no special requirements for injection molding machines. Because of its high melt viscosity, a deeper screw groove and a larger diameter nozzle hole are required. If the strength of the product is higher, a screw with a larger length to diameter ratio should be used for low-temperature plasticization. Ngaphezu kwalokho, PMMA must be stored in a dry hopper.

3. Isikhunta kanye nomklamo wesango

I izinga lokushisa lesikhunta can be 60℃-80℃, the diameter of the main runner should match the inner taper, the best angle is 5° to 7°, if you want to inject 4mm or more products, the angle should be 7°, and the diameter of the runner should reach 8 to 10mm, the overall length of the gate should not exceed 50mm. For products with a wall thickness of less than 4mm, the diameter of the runner should be 6-8mm

For products with wall thickness greater than 4mm, the runner diameter should be 8-12mm. Diagonal, fan-shaped and tabular gate depth should be 0.7 to 0.9t (t is the thickness of the product wall), and the diameter of the needle gate should be 0.8 to 2mm; smaller size should be used for low viscosity.

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The common vent holes have a depth of less than 0.05 and a width of 6mm. The demolding angle is between 30′-1° and 35′-1°30° in the cavity part.

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4. Melting temperature

It can be measured by air injection method: ranging from 210°C to 270°C, depending on the information provided by the supplier.

Withdraw the back seat, make the nozzle of the injection molding machine leave the sprue bushing, bese ngokwenza ngesandla ukubumba umjovo we-plasticization, okuwukubumba komjovo womoya.

5. Izinga lokushisa lomjovo

Umjovo osheshayo ungasetshenziswa, kodwa ukugwema ukucindezeleka okukhulu kwangaphakathi, kuhle ukusebenzisa umjovo wezigaba eziningi, njengokunensa-ngokushesha-kancane, njll., lapho ujova izingxenye eziwugqinsi, sebenzisa isivinini esincane.

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6. Isikhathi sokuvalelwa

Uma izinga lokushisa lingu-260°C, isikhathi sokuhlala asikwazi ukudlula 10 imizuzu, futhi uma izinga lokushisa lingu-270°C, isikhathi sokuhlala asikwazi ukudlula 8 imizuzu.

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