A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
181/11.5
A61F 11/08 (2006.01)
Patent
CA 1172965
ABSTRACT The ear plug (40) includes an elongate body with a rounded tip portion and of an elastic material enveloped by a deep-drawn sheath (41) of thin flexible plastics film material. Rearwardly the plug preferably has a neck portion from which the sheath projects in the form of a stiffer collar or flange. Production of the car plug in- cludes deep-drawing a thermoplastic film or foil into a sheath with desired thickness distribution, and filling the sheath with elastic material (53). Filling may take place simultaneously with deep-drawing, the body of elastic material constituting a die for deep-drawing in a forming hole (45), or after the deep-drawing. In the latter case, an elastic die body is used to advantage, the shape of which generally corresponds to that of the finished plug, for deep-drawing in a forming hole suited to the die body. (Fig. 5)
388645
Fetherstonhaugh & Co.
Gullfiber Ab
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