Feed process of wood - plastic door factory.

The structure of wood powder is fluffy, and the extruder screw is not easy to feed, especially when the moisture content of wood powder is high, the phenomenon of "holding rod" and "holding rod" often appears.

Unstable feeding will cause extrusion fluctuation phenomenon, resulting in the decline of extrusion quality and output. If the material stays in the barrel for too long, the material will be burnt and discolored, which will affect the internal quality and appearance of the product.

In order to ensure the stability of extrusion, forced feeding device and reasonable conveying mode are adopted.

Exhaust during treatment.

The small molecule volatile substances and moisture contained in wood powder are easy to cause defects to the product and cannot be completely removed after pre-treatment. Therefore, more attention should be paid to the exhaust system design of wood plastic composite extruder than that of ordinary plastic extruder, and multistage exhaust can be carried out when necessary.

To a large extent, the better the exhaust, the better the quality of the extruded product.

Structural design.

The shape of screw plays an important role in the extrusion process of wood - plastic composite. A reasonable screw structure can reduce the friction between wood fibers, produce proper shearing and dispersion mixing, and make the material system containing a lot of wood powder get a better uniform plasticizing.

Mold design and cooling finalize.

On the premise of ensuring smooth transition of flow channel design and reasonable flow distribution, WPC requires higher precision of pressure capacity and temperature control.

In order to ensure good fiber orientation and product quality, it is necessary to ensure that the nose has enough pressure capacity and long forming section, and the compression section and forming section even adopt double cone structure.

Wood plastic composite material thermal conductivity is poor, and the products are special-shaped materials, cooling finalize the design is difficult, more water cooling finalize the design. Reasonable cooling channel design ensures efficient cooling.