Plastic object for use in personal hygiene
AssigneeTrisa Holding AG
InventorsBeat Huber, Peter Waldispuhl
Life of this patent
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Abstract
A unitary two component article for personal hygiene, as a toothbrush, wherein the same is formed by injection molding of two differing plastic materials, which plastics do not adhesively or chemically bond to each other, thereby facilitating the manufacturing process. The two differing plastic parts of the toothbrush are mechanically connected, as by interfitting portions of the two plastic components and as by shrinking one plastic component about the other.
Claims29
A method for producing a toothbrush comprising at least two molded parts by injection molding, comprising the steps of:
- injection molding of a first of the at least two molded parts forming at least part of a toothbrush handle from a first plastic material in a first step that includes formation of projections or recesses, respectively, on the first molded part on at least part of a contact surface;
- and
- injection molding of a second of the at least two molded parts bearing a brush head from a second plastic material in a subsequent second step that includes formation of corresponding recesses or projections, respectively, on the second molded part and engaging the projections or recesses on the first molded part, so that one molded part of the first and second molded parts is at least partially enclosed by the other molded part to interengage the first and second molded parts and mechanically join the parts firmly to one another without the second plastic material forming a chemical bond with the first plastic material during the injection-molding operation.
A method for producing a toothbrush comprising at least two molded parts by injection molding, comprising the steps of:
- injection molding of a first of the at least two molded parts forming at least part of a toothbrush handle from a first plastic material in a first step that includes formation of projections or recesses on the first molded part on at least part of a contact surface;
- and
- injection molding of a second of the at least two molded parts bearing a brush head from a second plastic material in a subsequent second step in which the second plastic material is injection molded around or into the first molded part at the contact surface so that the second plastic material is molded with diametrically opposed corresponding projections or recesses so that the first and second molded parts interengage and mechanical join to one another without the second plastic material forming a chemical bond with the first plastic material.
Dependencies are inferred from the claim text.