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Plastic granulator manufacturers: What is flanging molding?
In order to increase strength and aesthetics, the mouth or bottom of some containers tends to be crimped. The cylindrical container can be crimped before or after the seam, and in most cases, it should be crimped after the longitudinal seam.
In the case of mass production, a cylindrical crimping machine can be used. For small production, manual crimping is used, and the tool is a mandrel and a heated crimping knife.
The crimping knife is a copper plate with a circular groove of a certain diameter. The leading end of the crimping knife is made into a 60° inclination angle, the inclination angle of the other end is about 20°-30°, the bottom of the groove is round, and the groove top depth is Equal to the width, equal to 2 times the sum of the wall thickness and the bead diameter. Whether the finished bead is inner or outer depends on whether the introduction end of the groove is on the outer circumference of the groove or on the inner circumference. Around the outer edge of the groove, a ring made of fiberboard is placed so that the rounded edge is easy to be grooved.
The crimping knife is usually placed on a steam plate to heat it. When it reaches a certain temperature (depending on the type of plastic, such as 120-130 ° C for polyvinyl chloride), the cylinder edge with the mandrel embedded is slightly Under the pressure, slowly rotate in the crimping knife until the crimping work is completed.
The mandrel is made of wood, and the plastic cylinder is supported when crimping. The diameter is just tightly locked in the cylinder. The length is smaller than the cylinder. The difference is the amount required for the crimping. The circle on the top of the mandrel is touched. Stop.
Flanging is the process of continuously expanding the plastic exposed on the end face of the steel pipe until it is substantially parallel to the flange face.
In the process of flanging the fluoroplastic tube, the flange portion of the fluoroplastic tube is first heated and flanked on the hot mold, and the mold temperature should be higher than the temperature required for the flange. When the fluoroplastic tube becomes soft, the mold is quickly transferred and pressurized at the same time, and it is completely cooled before exiting the mold. The tetrachloroethylene-hexafluoropropylene copolymer (F46) is flanged in the range of 260-300 ° C, and the polytetrafluoroethylene is higher, about 400 ° C. The mold can be heated by a salt bath, or the salt bath can be used to heat the nozzle.
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