Plastic shape in the process see a name more

1, specific volume and compressibility
Specific volume is the each volume that restrains plastic place to have (Cm3/g) , compressibility is model pink and model the ratio of both bulk or specific volume (its are worth constant to be more than 1) . They can be used to the large and small of room of feed a machine of affirmatory tool set, its numerical value requests bulk of room of feed a machine to want namely greatly big, clarify again together aerate inside model pink much, exhaust hardship, figuration cycle is long, productivity is low. Specific volume is minor conversely, and be helpful for press ingot, limitation.

2, bibulous rate
Bibulous rate is the degree that points to plastic imbibe, measuring a way is will say to weigh after sample drying first, in water intrusion 24 or after 48 hours, take out say to weigh again, the per cent that business accounting heft adds, it is bibulous rate namely.

3, fluidity
Plastic the ability that finishs fill speech in sure temperature and pressure calls fluidity. This is parameter of a when when the mould is designed, be necessary to think main craft. Fluidity is great easy create spill makings is overmuch, fill accent is not thick, model the organization is loose, colophony, filling accumulates separately, easy sticking to mould, drawing of patterns and arrange hardship, sclerotic and premature wait for malpractice. But fluidity is small fill is insufficient, not easy figuration, figuration pressure is great. Choose plastic fluidity to be necessary so with model request, shape craft and figuration condition photograph suit.

4, moisture and volatile content
All sorts of model guess contain a lot ofdifferent the moisture of degree, volatile content, cross fluidity of a long time to increase, easy excessive makings, hold hour long, shorten increase, the malpractice such as easy fit ripple, warp, influence model Electromechanical function. But when plastic too as dry as a chip when also can cause fluidity undesirable shape hard, so different plastic should undertake warm-up by the request as dry as a chip, right hygroscopic powerful stuff, be opposite in damp season even if especially the makings after warm-up also should avoid again moisture absorption.

5, heat quick sex
Plastic department points to heat quick sex certain and plastic relatively acute to heat, be heated hour leaves in high temperature longer or into makings mouth sectional too small, cut when the effect is big, easy fit of makings lukewarm heighten becomes angry, fall get together, the tendency of differentiation, those who have this kind of character is plastic call heat quick sex plastic.

6, Shui Min sex
Some is plastic (like polycarbonate) even if contains a lot ofa few moisture, but also can break out below high temperature, high pressure differentiation, this kind of function calls Shui Min sex, be necessary to this preheat is as dry as a chip.

7, hygroscopic
Because have all sorts of additive,model guesses, make its have different close scanty rate each to moisture, so plastic can divide roughly for moisture absorption, two kinds of conglutinate moisture and moisture of not bibulous not easy also conglutinate, guess water content is necessary to control promising limits inside, become gas or fit hydrolyze result in the moisture below high temperature, high pressure otherwise, make bubbly, fluidity reduces colophony, the exterior and Electromechanical function are undesirable. So hygroscopic plastic be necessary to be chosen by the request heat appropriately method and standard undertake warm-up, still need to shine with infrared ray when use in order to avoid again moisture absorption.

8, fuse-element index
Fuse-element index (MI) , it is the numerical value of a kind of fluidity when showing plastic material is machined.

9, hardness
Normally the most commonly used Rockwell hardness and hardness of carry on family name check plastic hardness two kinds method makes clear. A of family name of meantime carry on is commonly used will determine softer plastic, wait like elastomer or the balata such as TPE; Family name D uses carry on to determine harder plastic, be like normally extensive is used plastic reach halfway project is plastic, and mostly the project with tall function plastic or harder project is plastic, need to determine with Rockwell.

10, insulation attaint voltage
Insulation attaint voltage is will tall voltage brings to bear on at test piece, arrive at the least tension of insulating properties attaint, divide with polar an interval (the ply of sample) value (Kv/mm) .

11, fused heat
Fused heat weighs fused latent heat again, it is crystallization polymer be being formed or the energy of demand of the place when fused crystal. This has some of energy use construction of crystallization of fused high polymer, crystallization expect should is not to amount to the energy that appoints the place below fused temperature to need to want than noting model when noting model crystallization polymer so much, need not fuse about be not crystallization polymer latent heat.

12, specific heat capacity
The stock temperature that specific heat capacity is unit heft rises calorific requirement of 1 the place when spending [J/kg.k] .

13, thermal diffusion coefficient
Thermal diffusion coefficient is to show temperature is heating content guesses delivered rate, the quantity of heat that when weighing 1 degree to its are worth coefficient of thermal conductivity is by the stock of unit quality temperature is lifted again, needs (specific heat capacity) draw caloric rate with the data (coefficient of thermal conductivity) come resolution. Pressure is little to influence of thermal diffusion coefficient, temperature is bigger to its influence.




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