Co-extrusion forming method for plastic profile and sealing rubber strip

2014 
The invention discloses a co-extrusion forming method for a plastic profile and a sealing rubber strip. The co-extrusion forming method for the plastic profile and the sealing rubber strip comprises the following steps: plastic profile extrusion forming, coextrusion compounding, and cooling and sizing, wherein air cooling is firstly carried out on the plastic profile obtained by extrusion forming, then the plastic profile is heated by virtue of a hot air device and then enters into a coextrusion mould to be coextruded and compounded with the sealing rubber strip, and finally, the plastic profile passes through water to be cooled and is coextruded to be compounded, so that a composite section is obtained. The coextrusion mould is composed of a front block and a rear block, and a liquid runner in the coextrusion mould is a gradient booster-type runner. The plastic profile is extruded and then enters into the coextrusion mould after being subjected to air cooling sizing and hot air preheating, so that the probability of deformation of the plastic profile can be greatly reduced, and the bonding strength of the plastic profile is guaranteed; the coextrusion mould is composed of the front block and the rear block, the gradient booster-type runner is adopted inside the mould, accuracy of an adhesive tape binding position can be guaranteed, and bonding strength between the rubber strip and the profile can be improved; meanwhile, a water passing manner is adopted for cooling, and the profile can be rapidly and uniformly cooled.
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