Long Glass Fiber:Long Glass Fiber And Short Glass Which Is Good?

- Nov 16, 2017 -

The chemical and physical properties of PA6 are very similar to those of PA66, however, it has a lower melting point and a wide temperature range.Its impact resistance and anti-solubility better than PA66, but also more hygroscopic.Because many of the quality characteristics of plastic parts are subject to hygroscopicity, so take full account of this when designing your product with PA6.In order to improve the mechanical properties of PA6, often add a variety of modifiers.Glass is the most common additive and is sometimes added to synthetic rubbers to improve impact resistance.The chemical and physical properties of PA6 are very similar to those of PA66, however, it has a lower melting point and a wide temperature range.Its impact resistance and anti-solubility better than PA66, but also more hygroscopic.Because many of the quality characteristics of plastic parts are subject to hygroscopicity, so take full account of this when designing your product with PA6.In order to improve the mechanical properties of PA6, often add a variety of modifiers. Glass is the most common additive and is sometimes added to elastomers such as EPDM and SBR to improve impact resistance.


For products without additives, the shrinkage of PA6 is between 1% and 1.5%.Glass fiber additives can reduce the shrinkage to 0.3% (but perpendicular to the flow direction, and even slightly higher).The actual shrinkage and plastic parts design, wall thickness and other parameters of a function.


Injection molding process Drying: PA6 can easily absorb moisture, so the drying process with particular attention.If the material is packed in waterproof material supply, the container should be kept closed. If the humidity is greater than 0.2%, drying in hot air of 80C for 16 hours or more.If the material has been exposed to air for more than 8 hours, 105C is recommended, at least 8 hours of vacuum drying.


Melting temperature: 230 ~ 280C, for enhanced varieties of 250 ~ 280C.


Mold temperature: 80 ~ 90C. Mold temperature significantly affects the degree of crystallinity, degree of crystallinity also affect the mechanical properties of plastic parts.


For structural parts, degree of crystallization, it is recommended that the mold temperature is 80 ~ 90C.


For thin-walled plastic flow longer are also recommended higher mold temperature. Increasing the mold temperature increases the strength and stiffness of plastic parts, but reduces the toughness.


If the wall thickness is greater than 3mm, it recommends the use of a low temperature mold 20 ~ 40C. For glass reinforcement mold temperatures greater than 80C.


Injection pressure: generally between 750 ~ 1250bar (depending on the materials and product design).


Injection speed: high speed (slightly lower enhancement type material).


Runners and Gates: PA6 solidification time is very short, so the gate is very important.


Applications Because of good mechanical strength and rigidity of the structural member are widely used:

Because of good wear-resistance, also used in the manufacture of bearings.


FAQ:flash burr bubbles, sink marks, weld mark, burning and black lines, stripes and silver, surface scratches, and surface fog pattern, color and impurities scorch, burn black, poor gloss, cracking white, color unevenness, fragile, delamination, warpage, poor mold release, mold severe corrosion.






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