About the general design principles of the extruder extrusion

Extruder in the process of production for the general design of the extrusion has certain standards require that, if operated according to such standards, for the extrusion of extruder can achieve better effect. Now, let's look at this is what kind of a design criteria

Extrusion of thermoplastic elastomer design including the design of the geometric parameters (such as wall thickness, reinforcement, radius, hollow and hinge), at the same time to consider their impact on product processing and performance. The following general guidelines lists out design.

Wall thickness

Uniform or almost uniform cross section thickness will be more easy workability, reduce the cost, better error control, better surface finish and more complex shapes. Minimum wall thickness is 0.5 mm (0.02 "), and the maximum thickness of 9.5 mm (0.375 "). A thinner wall thickness is possible, but need to use Santoprene8000 thermoplastic elastomer series. The change of wall thickness to smooth smooth, and should be as small as possible, because it will help the stamping die equilibrium.

reinforcement

In the process of wall thickness change, if too intense thickness changes, may occur in the process of equilibrium flow field problems. The thickness of the steel should be 50% of the nominal wall thickness, the radius should be based on the design.

The radius of

Where dramatic change to replace the transition with rounded corners. Extrusion parts is the smallest radius of 0.20 mm (0.007 ").

hollow

There may be a hollow section in the cross section. Extrusion die might just start with the shape of a hollow section, at the time of cooling can use compressed air to keep the shape in the hollow cross-section, another way is to use the outside of the extruder vacuum to help keep hollow section shape.

In the process of extrusion inward blowing is a means of cooling parts inside. This needs or the punching direction along the parting line has air can flow.

Welded joint

Hot welding is more popular used to joint made of TPV extruding glue method. Heat is introduced into the junction surface, making the surface melting, then the surface joint together, and a slight pressure to ensure that no gas into the contact surface between. After cooling, junction and component itself almost the same intensity. Another method is to use adhesive joint extrusion parts system. Need some filler, depends on the joint joint materials and the requirements of the bonding strength.

hinge

Hinge is to eliminate some point stress or against a particular point focus deflection of a method. If at some point in bending, the stress will focus on the corner.

The above content is about the general design principles of extrusion of extruder.