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proccesing of polyamides (PA)

Polyamides can be processed by all common methods. However, low melting viscosity polyamides require special attention.
Thanks to their crystalline structure, polyamides are easily injected and have high fluidity. This is especially true when injecting thin-walled parts.
Due to their moisture sensitivity, polyamides require an efficient drying process. Lack of sufficient drying leads to the formation of splits on the surfaces, as well as less mechanical properties due to the destruction of materials (heat and water lead to oxidation).
Injection molding:
All polyamide materials can be processed with injection molding.
If the humidity is more than 0.2%, drying in an oven at 80 (C (176 F) is recommended for 16 hours. If the material is exposed to air for more than 8 hours, it is recommended to dry the vacuum at 105. C (221 F) for more than 8 hours.
Template temperature: 60-80. C
Melting point: 230 – 280 ؛ C; 250-300 C for reinforced scores
Material injection pressure: 75 – 125 MPa (depending on material and product design)
extrusion:
The maximum allowable moisture content is 0.1%.
Melting point: 230-290. C
Compression ratio: <4.0
L / D ratio: 25-30 (barrier screw or polyolefin screw with equal feed, transfer and measurement section)
Polyamides are also widely used to produce printed 3D parts using laser-selective laser (SLS). The 3D printing technique used to make plastic prototypes has many advantages, such as the production of complex parts, individual designs, and cost-effective small-scale production.