耗材介绍一
PA6
Nylon 6, also known as PA6, polyamide 6, nylon 6, is a polymer compound. The chemical and
physical properties of nylon 6 are very similar to nylon 66, however, it has a lower melting point and
a wide processing temperature range. It has better impact and dissolution resistance than nylon 66
plastic, but is also more hygroscopic. Because many quality characteristics of plastic parts are
affected by hygroscopicity, it is important to take this into account when designing products using
nylon 6. In order to improve the mechanical properties of nylon 6, various modifiers are often
added. Glass fiber is the most common additive, and sometimes synthetic rubber, such as EPDM and
SBR, is added to improve impact resistance. For products without additives, the shrinkage of nylon 6
plastic material is between 1% and 1.5%. Adding glass fiber additives can reduce the shrinkage to
0.3% (but slightly higher in the direction perpendicular to the process). The shrinkage of molding
assembly is mainly affected by the crystallinity and hygroscopicity of the material. Actual shrinkage is
also a function of part design, wall thickness and other process parameters. Nylon 6 injection drying
treatment Since nylon 6 easily absorbs moisture, special attention should be paid to the drying
before processing. If the material is supplied in waterproof packaging, the container should be kept
tightly closed. If the humidity is greater than 0.2%, it is recommended to dry in hot air above 80°C for
16 hours. If the material has been exposed to air for more than 8 hours, vacuum drying at 105°C for
more than 8 hours is recommended.
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