Soft and hard co-extrusion one-step forming method for UPVC profile and modified TPE rubber strip

Abstract

The invention discloses a soft and hard co-extrusion one-step forming method for a UPVC profile and a modified TPE rubber strip. The method comprises the following steps: extruding and forming the UPVC profile; adding modified TPE granules to a feeding barrel of a co-extruder, and controlling the temperature of the barrel of the co-extruder at 160-175 DEG C and the temperature of a mold at 190-210DEG C; d) opening a heat gun connected to a soft material mold of the co-extruder, controlling the temperature of the heat gun at 180-220 DEG C, and controlling air pressure at 0.1-0.5 MPa; connecting a groove of the cooled UPVC profile with a clamping groove, in a certain cross-sectional shape, of the soft material mold, controlling rotating speed of a screw of a main engine of the co-extruder at 25-35 rpm, bonding the melted modified TPE rubber strip maintaining a certain size under the action of extrusion pressure with the hard UPVC profile, and continuously passing the extruded hard and soft integrated profile through a water tank for vacuum adsorption under traction of a tractor. While back threading processes of the rubber strip in the door and window assembly process are reduced, aging resistance of the sealing rubber strip is improved.

Description

technical field [0001] The invention relates to a one-step molding method for soft and hard co-extrusion of U-PVC profiles and modified TPE rubber strips, belonging to the technical field of plastic processing. Background technique [0002] At present, the U-PVC special-shaped door and window soft rubber strips currently available in the market are usually in two forms. One is made of rubber, usually through mechanical embedding, to solve the sealing between the door and window frame leaves and between the leaves and the glass. This kind of assembly belongs to Secondary processing. In the subsequent use process, it may cause defects such as uneven stretching and easy falling off of the sealing strip, which will affect the sealing effect of doors and windows. One is to use PVC strips. At present, the commonly used method is to co-extrude the sealing strips and profiled materials. (Pre-co-extrusion or post-co-extrusion), one-time processing, complete the assembly between the ...

AI Technical Summary

Problems solved by technology

In the subsequent use process, it may cause defects such as uneven stretching and easy falling off of the sealing strip, which will affect the sealing effect of doors and windows. One is to use PVC strips. At present, the commonly used method is to co-extrude the sealing strips and profiled materials. (Pre-co-extrusion or post-co-extrusion), one-time processing, complete the assembly between the sealing strip and the profile, compared with the first one, although the follow-up process is reduced, but it has certain disadvantages, such as easy aging, Easy to precipitate, the hardness of the material fluctuates greatly with the change of temperature