1、通常用塑胶料性能（Plastic properties are usually used）1.ABS: acrylonitrile butadiene styrene polymer1., the role of the three ingredientsAcrylonitrile (A) - to make the product higher hardness, improve wear resistance, heat resistance.Butadiene (B) - to strengthen flexibility, to maintain material toughness,
2、 elasticity and impact strength.Styrene (S) - to maintain good formability (flowability, colouring) and to maintain material rigidity (note different components according to different grades).2.ABS is good in electroplating and is the best electroplating in all plastics.Compared with GPPS, the impac
3、t strength of 3.ABS increased significantly.4.ABS raw material is light yellow and opaque, and the product has good surface finish.5.ABS shrinkage is small and size stable.6., no organic solvents: such as dissolved in ketones, aldehydes, esters, and oxidation of hydrocarbons and formation of turbidi
4、ty (ABS mucilage).7. material blending property:ABS+PVC improves toughness, flame resistance, and aging resistance.ABS+PC improves impact resistance and heat resistance.Forming process of ABS1. before molding, it should be fully dried, so that the moisture content is less than 0.1%, the drying tempe
5、rature is 85 degrees, and the time is above 3HRS.2.ABS fluidity is good, easy to produce beer plastic drape, injection pressure in 70100MPa, not too big.3., the cylinder temperature is not more than 250 degreesThe front cylinder is 160210 degrees centigrade, the medium cylinder is 170190 degrees cen
6、tigrade, and the rear cylinder is 160180 degrees centigrade. The high temperature will cause the decomposition of the plastic composition and decrease the flowability.4. mold temperature 4080 DEG C, the appearance of high demand, mold temperature is also high.5. injection speed is medium and low spe
7、ed. Injection force 80130MPa.6.ABS internal stress test: the product shall be immersed in kerosene for 2 minutes without any cracks.Two,.MBS - transparent ABS, Methacrylate Butadiene Styrene copolymer.Main properties: transparency, toughness, acid and alkali resistance, good fluidity, easy molding,
8、coloring and dimensional stability.Three.SBS - K material (transparent). Butadiene and ethylene polymers (KR01, KR03).Main properties: transparent, good elasticity, convenient molding.Four,.PS material: polystyrene (GPPS hard gum, HIPS modified poly ethylene GPPS - hard HIPS - not broken.A) GPPS (52
9、0%) butadiene rubber was modified to improve the impact resistance of hard rubber.B) color: GPPS- transparency high, broken, HIPS- opaque, milky or slightly yellow.C) HIPS and GPPS can be blended with beer according to requirements. The more GPPS ingredients, the better the surface gloss and liquidi
10、ty of the productThe better. HIPS:GPPS=7:3 or 8:2 can maintain sufficient strength and surface quality.* molding process of poly ethylene1.GPPS molding temperature range (molding temperature is far from the degradation temperature of heating) flow and curing speed, so the molding cycle is short, can
11、 fill the cavity under the premise, the barrel temperature should be lower, before the barrel temperature of 200 c and 160 C after the barrel.2.GPPS liquidity is good, molding does not require very high 70130PMa pressure, the pressure is too high, but make systemResidual internal stress increased es
12、pecially after injection. (modified PS, i.e., HIPS, slightly worse than GPPS).3. injection speed should be higher in order to weaken the weld mark (watermark clip) but the injection speed by injection pressure effect, high velocity may produce flash (Pi Feng) or die cataclasm.4. mold temperature: 30
13、 50.5. polystyrene (GPPS) because of moisture absorption is small, generally do not have to take a bath before molding, and modified polystyrene (HIPS) must be drying treatment temperature of 60 degrees 80 DEG C, drying time 2HRS.Five polypropylene (PP) - 100 fold gum, crystalline plastic, the main
14、properties are as follows:1., translucent color, light quality (density 0.91) can float in water.2. good liquidity and formability, surface gloss (color, leave mark at PE).3., high molecular measures make tensile strength high, yield strength (fatigue resistance) high.4., high chemical stability, in
15、soluble in organic solvents, injection, hot, and bonding difficult.5. 、 abrasion resistance, volt resistance, and good impact resistance at room temperature.6. molding shrinkage is large (1.6%), the size is more unstable, plastic parts easily deformed, shrink.* understanding of the forming process o
16、f polypropylene (PP)1. polypropylene has good fluidity and lower injection pressure can fill the cavity. The pressure is too high, easy to produce fly edge, but too low, shrinkage will be serious, injection pressure is generally at 8090MPa, the pressure to take about 80% of the injection pressure, i
17、t is appropriate to take a longer packing time to shrink.2., suitable for rapid injection, to improve the poor exhaust, exhaust tank should take a little deeper 0.3mm.3. high crystallinity polypropylene, the front feed cylinder, cylinder 200240 C 170220 C 160190 C, after the barrel, due to its formi
18、ng temperature range, easy molding, in order to reduce the number of fronts and actually shrink by low temperature.4. because the material shrinkage rate is large, in order to accurately control the size of plastic parts, the cooling time should be appropriately extended.FiveEasy to get low mold tem
19、perature (2040 DEG C) mold temperature is too high the crystallinity, molecular interaction, products of good rigidity, good gloss, but softness, poor transparency, has shrunk significantly.6. back pressure to 0.1MPa is appropriate, dry powder coloring process should appropriately increase back pres
20、sure, in order to improve mixing effect.Six. Polyvinyl chloride (PVC)Polyvinyl chloride (PVC) is a crystalline plastic with a transparent material.The main performance is as follows1. by adding plasticizers to make material soft hardness range.2. self extinguishing and poor thermal stability.3.PVC d
21、issolved in cyclohexanone and the hydrogen furan, two chlorine ethane, injection water with soft open water (containing cyclohexanone).4.PVC is mainly used for vinyl (and doll).* understanding of the forming process of poly (vinyl chloride) (PVC)1., soft PVC shrinkage rate is larger (1.02.5%) PVC po
22、lar molecules easy to absorb moisture, forming before drying, drying temperature 8595 DEG C, 2 hours.2. during molding, the barrel is heated for many times, and the vinyl chloride monomer and HCL (degradation) are decomposed. Therefore, the die cavity and the dead corner in the machine head should b
23、e cleaned frequently.3., soft PVC adding ABS, can improve toughness, hardness and mechanical strength.4. because the PVC molding processing temperature is close to the decomposition temperature, therefore should strictly control the barrel temperature, as far as possible with the low molding tempera
24、ture. At the same time, the molding cycle should be shortened as much as possible in order to reduce the residence time of the dissolved material in the barrel and the temperature parameters of the barrel. The front barrel is 160170 DEG C, the medium cylinder is 160165 degrees centigrade and the mat
25、erial is 140150 DEG C.5. for easy decomposition, poor mobility, mold runner and gate as short as possible, thick with less pressure loss and slow charge as soon as possible decoration cavity injection pressure of MPa should be used in high pressure and low temperature, injection back pressure 0.51.5
26、MPa, PVC wall thickness should not be too thin, should be more than 1.5mm, otherwise the material flow filling cavity difficult.6., the injection speed should not be too fast, so as not to dissolve the material through the gate when severe friction, so that the temperature rise, easy to produce shri
27、nkage marks.7., mold temperature as low as possible (about 3045 degrees Celsius) to shorten the molding cycle and prevent the deformation of plastic parts (when necessary, plastic parts should be set by the molding die).8. In order to prevent the cold material from blocking the gate or flowing into
28、the die cavity, a larger cooling material shall be designed to store the cold material.Seven Polyoxymethylene (POM steel).Polyoxymethylene (POM) commonly known as steel is a crystalline plastics, the main performance is as follows:.1. POM is milky white with glossy plastic.2., with comprehensive mec
29、hanical properties, hardness, high rigidity, good impact resistance, and excellent wear resistance and self lubrication.3., organic solvent resistance, good performance and stable performance.4. after molding, the size is more stable, less affected by temperature and environment.Understanding of for
30、ming process of *POM POM1. formaldehyde moisture absorption is small (water absorption rate 0.5%), generally do not take a bath before the formation or a short dry bath.2., forming a narrow range of temperature, poor thermal stability, more than 250 degrees Celsius decomposition of formaldehyde unit
31、 (melting material color darken), so the only increase in temperature, improve liquidity, harmful and ineffective. The normal beer mould should adopt lower material barrel temperature and short residence time, and improve the injection pressure can improve the fluidity of the melt and the surface qu
32、ality of the melt. (melt fluidity is sensitive to shear velocity).Temperature parameters: front barrel 190 - 210 DEG C, medium cylinder 180 - 205 DEG C, cylinder 150 - 170 DEG C.Pressure parameter: injection pressure is about 100MPa, back pressure 0.5MPa.3., mold temperature: 80 - 100 degrees is app
33、ropriate (usually shipped hot oil).4.POM cooling shrinkage rate is very large (22.5%), so it is easy to shrink. Therefore, it is necessary to extend the holding time to shrink.Eight, polyethylene (PE) “flower“ material“Polyethylene (PE), commonly known as “flower material“, belongs to crystalline pl
34、astic, and its main properties are as follows:1. polyethylene, high density (HPPE), sub lux and low grade (LPPE) two, with high density, transparent cross weakened. .2. polyethylene is translucent particle, the appearance of the rubber is milky white.3. polyethylene has the flexibility, impact resis
35、tance, extensibility and abrasion resistance, low temperature toughness.4. at room temperature does not melt in any flux, the chemical properties of stability, on the other hand, PE difficult to bonding. .5. mechanical strength is not high, the thermal deformation temperature is low, the surface is
36、easy to scratch. .6. polyethylene (PE) is commonly used in blow molding products.* understanding of the molding process of polyethylene1. 、 good liquidity, molding temperature range, easy to shape.2., injection pressure and pressure should not be too high, to avoid beer parts, resulting in large str
37、ess and deformation, cracking, injection pressure6070MPa.3. low water absorption, no drying before processing.4. improve the appearance quality of barrel temperature, but the molding shrinkage rate (22.5%) cylinder temperature is too low (with point gate products easy deformation, forming more serio
38、us by multi point gate, improve the warping) temperature parameter: 200220 C, in the front feed cylinder barrel 180190 barrel 160170 C C, after.FiveBefore and after the mold temperature is consistent (mold temperature is generally 2040 degrees, suitable) cooling water should not be too close to the
39、cavity surface, so as to avoid local temperature difference is too large, so that residual internal stress products.Increase mold temperature, product gloss, but long molding cycle.Reduce mold temperature, soft products, high transparency, high impact strength, mold temperature is too low, cold defo
40、rmation caused by products or molecular directional delamination, in short, by adjusting the mode temperature, can adjust the hardness and flexibility of products.6. because of the soft quality, it is necessary to use the method of forced demoulding instead of row (slider).Nine, polycarbonate (PC) (
41、the most expensive price)Polycarbonate (PC), commonly known as bullet proof glass glue, is the main property of crystalline plastics:1. the appearance of transparent, hard, tough, slow burning, slow fire from the fire.2.PC material has the best impact resistance in plastics.3. molding shrinkage is s
42、mall (0.50.7%), high precision and high dimensional stability.4., chemical stability, but not alkali, ketones, aromatic hydrocarbons and other organic fluxes.5. 、 poor fatigue resistance and sensitive to notch.* understanding of polycarbonate (PC) molding process1.PC is sensitive to micro moisture.
43、It should be fully dried before molding, moisture content is 0.015%, drying temperature is 110120 DEG C, 12HRS.2., poor liquidity, high pressure injection molding, but the injection molding pressure is too high will make the product residual large internal stress, and easy to crack.3.PC material vis
44、cosity is very sensitive to temperature, increase temperature, viscosity drop, the front cylinder 240260 DEG C, medium cylinder 260280 DEG C, rear cylinder 220230 DEG C is not more than 310 DEG C.4. die design requirementsThe runner is rough and the runner is polished. The cavity and core shall be h
45、ardened or plated with chromium.5., the injection speed is too fast, dissolved easily broken, the gate has paste spots, poor exhaust (trapped gas), so that products burned.6. mould temperature 80100 centigrade.7. annealing treatment, 125135 degrees 2HRS, and natural cooling to room temperature.Ten p
46、olyamide (PA) materialPolyamide, commonly known as nylon (NYLON), belongs to crystalline plastics. There are many kinds, such as nylon 6, nylon 66 and nylon 1010.Nylon 1. has good toughness, wear resistance, hardiness, self lubrication and self extinguishing.2. low temperature performance, high impa
47、ct strength, and high tensile strength, good elasticity.3. nylon water absorption, water absorption to some extent improve tensile strength, but other strength decreased (such as tensile, stiffness), shrinkage rate of 0.81.4%.4., weak acid, weak base and general solvent, under normal temperature can
48、 be fused to phenol (phenol as adhesive), soluble in formic acid and calcium chloride saturated methanol solution.* understanding of nylon forming process1. fully dry before injection, drying temperature 8090 DEG C, drying time 24HRS.2. nylon low viscosity, good liquidity, easy to appear batch (Fei
49、Bian) pressure is not too high, generally 6090MPa.3. changes with the barrel temperature, the temperature shrinkage rate fluctuations, prone to high melt color, crisp silver. Nylon material is below the melting temperature of the ridge, will damage the mold and screw, barrel temperature of 220250 DEG C, not more than 300 DEG C.4. mode temperature control:Is the crystallization of nylon plastic products by the mold temperature effect has higher demand for mold temperature control.High mold tempera
