Heat up the knowledge of the processing that note model with solid plastic sex

Hot solid sex is plastic note model to use one screw or the machine tube that one force plunger has heated polymer classics (260 ℉ of 120 ～ ) in order to reduce viscosity, in the mould that subsequently infuse has heated (300, 450 ℉) . Once stock is full of a mould, protect to its namely pressure. Produce chemical cross-linking right now, make polymer hardens. Hard (namely of solidify) goods takes the advantage of heat to be able to go out from the top in the mould, it cannot shape again or again melt.

Note model to shape set stock to take one in order to to close the hydraulic pressure drive of the mould closes modular plant and the inject plant that can carry stock. Sex of most heat solid is plastic it is to be in grain condition or piece use below shape, can send screw inject unit by gravitational hopper. When treatment polyester whole moulding expects (BMC) when, it is like " biscuit is round " , use in controlling stock whorl chamfer for makings piston.

The treatment polymer that uses this kind of technique is (according to its size arranges dosage) ; Phenolic aldehyde makings of moulding of whole of plastic, polyester, 3 get together polymer of plastic, vinyl ester mixes aldehyde of cyanogen amine, epoxy resin, Niao adjacent benzene 2 formic acid ester of 2 Xi third (DAP) .

Sex of most heat solid is plastic contain many filler (amount to portion of 70 ％ weight) , in order to reduce cost or raise its low contractive function, increase intensity or special performance. Commonly used filler includes fiber of fibre glass, mineral fibre, argil, wood and carbon black. These filler may have abrasiveness very, produce tall viscosity, they must be overcome to machine equipment place.

Process

Thermoplastic plastic originally with heat the gender is plastic will reduce viscosity when heat. However, heat up solid sex to plastic viscosity follows time and temperature however and increase, because produced chemical cross-linking reaction,this is. The integrated result of these action is viscosity shows U curve along with time and temperature. Finish in lowermost viscosity area fill up the operation of the mould this is injection mould of hot solid sex the purpose of model, because right now stock shapes,need pressure is lowest for mould appearance place. This also conduces to pair of fiber in polymer damaging lowest.

Inject moulding process uses one screw to make stock sheds the machine canister that passes via heating, machine canister circulates with water or oil at machine canister in the chuck all around. Screw can press the different type of every kinds of material to try to design, compress slightly heat in order to take off except air stock obtains low viscosity. The flow of herein of stock of sex of most hot solid is quite good.

The operation that makes stock enters a mould is break down screw turn and promote screw high speed with hydraulic pressure forward, make the low viscosity stock that is converted by model is pressed into the mould. This kind of rapid flow asks to be in 0. Antrum of model of the cram in the time of 5 seconds, pressure needs to achieve 193MPa. Once the movables of high speed shedding of the stock when cram film antrum is unripe bigger rub examine heat reacts with quickening chemistry. Modular antrum once by cram, inject pressure will fall dwell pressure 34.5, 68.9MPa. This kind of dwell pressure is maintained go up in stock 5, 10 seconds, subsequently discharge is pressed, begin next periodic model to change level next.

This kind of stock is maintained to be in hot mould, till harden, open plant combining a model next, the top gives product. When the top goes out, goods just can be to be spent gently not solidify and a bit soft, after be being taken out 1 minute or the quantity of heat that goods interior uses to withhold inside 2 minutes finishs final solidify. The whole production cycle of goods of hot solid sex is 10, 120 seconds, this depends on the category of goods ply and raw material.

Used a lot of differring to improve the quality of goods and reappearance with technical skill. In view of a few heat up solid sex polymer to produce gas when heat, there often is operation of a deflate after the mould is full of by the part. In this one measure, the mould is small small open, so that let aeriform transgression, next at once is shut, register the rest of stock again person.

Noted tool set model to offer higher intensity, better size control, improved exterior position (the exterior) , because was used,this is contain telescopic velar antrum gets with the mould of velar core, the mould in injection process is OK open 1 ／ 8, L ／ 2 In, and subsequently rapid impaction, be like a mould to shut in that way.

The block mould that by fibre glass, inserts and polyester not saturated colophony makes is plastic and OK on machine jacket another special devices finish injection mould model. Get on join of one piston feeder at machine canister, expect with be being offerred compulsively, the means that can differ with two kinds subsequently has operation. One kind contains traditional reciprocating type screw, screw pushs stock to ahead, mix at the same time refine and heat. Extreme of this need screw has one to had stopped a powerful person. Preventive makings returns regurgitate screw whorl to go up, because the viscosity of stock is very low. Additionally one kind of means is to use force plunger or piston to control stock into mould model antrum, force plunger often is used at containing fibre glass weight to exceed the stock of 22 ％ , damage because of this pair of fibrous lesser, yi Ke gains higher strength.





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