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A plastic sleeve is molded concentrically around a thin wire by using a retractable metal insert surrounding the wire in the mold cavity.
English (United States)
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Molding Plastic Around a Thin Wire
A plastic sleeve is molded concentrically around a thin wire by using a
retractable metal insert surrounding the wire in the mold cavity.
In the manufacture of wire-matrix print heads and many other applications, a
thin, flexible wire 1 on the order of 0.3 mm diameter must be placed accurately in
the center of a plastic sleeve 2 having a length of 10 mm or more. Fig. 1 shows
an injection mold assembly 3 into which thin wire 1, brazed at one end to barrel
4, has been inserted. The wire runs through a small hole in retractable plunger
5, which is held toward barrel 4 by spring 6.
As plastic material 7 (Fig. 2) is injected into mold 3, it flows through holes 8 in
barrel 4 and forces plunger 5 downward against the force of spring 6. This
gradual retraction holds wire 1 firmly in place as sleeve 2 of material 7 is being
formed around it, so that the wire cannot be bent out of position. Shoulder 9
stops the travel of plunger 5 when the full length of sleeve 2 has been achieved.
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