Core pins and sleeves|high quality needle tube mold

Translucent or opaque white crystalline polymers, with plasticity. The density of 1.15g/cm3. The melting point of 252 DEG C. Embrittlement temperature
30 ℃. The core pins and sleeves thermal decomposition temperature greater than 350. Continuous heat resistant 80-120 ℃, equilibrium water absorption of 2.5%
. Acid, alkali, salt solution, the majority of alkyl halides, hydrocarbons, esters, ketones and other corrosion, but soluble in phenol
Polar solvent, formic acid. With excellent wear resistance, self lubricity, high mechanical strength. But the larger core pins and sleeves absorbent, so poor dimensional stability. Widely used in the manufacture of machinery, automobile, chemical and electrical equipment parts, such as gears, pulleys, rollers, roller shaft, pump impeller, fan blade, high-pressure seal gasket seat, Wai,, bushing, handles, supporting frame, wire coating etc.. Can also be made into film used for packaging materials. In addition, also can be used for the production of medical equipment, sporting goods, daily necessities etc.. Drying: if the processing of the material is sealed, it is not necessary to dry. However, if the storage container is opened, so that the hot air drying at 85 . If the humidity is higher than 0.2%, also need to be 105 ℃, 12 hours vacuum drying. The melting temperature: 260~290 ℃. The glass additives products of 275~280 ℃. The melting temperature higher than 300 ℃ should avoid. Mold temperature: 80 ℃. Mold temperature affects the crystallinity, crystalline will affect the physical properties of the products. For thin wall core pins and sleeves, if the use of less than 40 DEG C temperature of mold, core pins and sleeves crystallinity changes with time, in order to maintain the geometric stability of core pins and sleeves, the need for annealing. Injection pressure: normally 750~1250bar, depends on the material and product design. Injection speed: speed (for enhanced materials should be slightly lower). The runner and gate: due to the solidification time of PA66 is very short, the gate location is important. The gate aperture not less than 0.5*t (where t is the thickness of plastic parts). If you use hot runner, gate size should be smaller than using conventional channel, because of the hot runner can help prevent premature freeze. If using submarine gates, the minimum diameter of core pins and sleeves gate should be 0.75mm.

 

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