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US 2023/0400136 A1Published application
Method of manufacturing a two component sealing gasket for plastic pipe
AssigneeS & B Technical Products, Inc.
InventorsMark A. Weih, Rodney Pacheco
Life of this patent
Estimating the term…
Abstract
A pipe sealing gasket is shown which is designed to be received within a raceway provided within the female, belled end of a section of plastic pipe which is assembled with a mating male pipe end to form a plastic pipe joint. The gasket is a two-component gasket having a softer, elastomeric portion and a harder, plastic ring portion. A splicing technique is used to form the softer, elastomeric portion with the harder, plastic portion being injection molded over the previously formed elastomeric portion.
Claims12
1:
- A method of manufacturing a pipe sealing gasket designed for receipt within a raceway provided within a female bell socket end of a thermoplastic pipe, the method comprising the steps of:
- extruding a gasket section of a relatively softer rubber-like material to form a given length of material having opposing free ends and having a desired final profile cross section;
- splicing the opposing free ends of the gasket section together to form a continuous gasket band of the rubber-like material;
- placing the spliced gasket band in a conventional plastic injection mold;
- injecting a relatively harder plastic-like material over the spliced gasket band in the mold and allowing the harder plastic-like material to bond to the relatively softer rubber-like gasket band to form a finished two-part sealing gasket.
2 more elements
2:
- The method of claim 1, wherein the relatively softer, rubber-like material is selected from the group consisting of natural and synthetic rubbers.
3:
- The method of claim 2, wherein the relatively softer, rubber-like material is selected from the group consisting of EPDM, TPV and other TPE materials.
4:
- The method of claim 1, wherein the relatively harder, plastic-like material is a polyolefin.
5:
- The method of claim 4, wherein the relatively harder, plastic-like material is polypropylene.
6:
- The method of claim 1, wherein the splicing step is accomplished by using a conventional splicing adhesive to join the free ends of the gasket section.
7:
- A method of manufacturing a pipe sealing gasket designed for receipt within a raceway provided within a female bell socket end of a thermoplastic pipe, the method comprising the steps of:
- extruding a gasket section of a relatively softer rubber-like material to form a given length of material having opposing free ends and having a desired final profile cross section;
- splicing the opposing free ends of the gasket section together to form a continuous gasket band of the rubber-like material, the splicing being accomplished by using a hot PE or PP film that is placed between the two opposing free ends of the gasket section and holding the free ends together until they cool and form a strong bond therebetween;
- placing the spliced gasket band in a conventional plastic injection mold;
- injecting a relatively harder plastic-like material over the spliced gasket band in the mold and allowing the harder plastic-like material to bond to the relatively softer rubber-like gasket band to form a finished two-part sealing gasket, the relatively harder, plastic-like material forming a continuous ring which resists any tensile forces which would tend to separate the spliced gasket band portion of the finished gasket.
2 more elements
8:
- The method of claim 7, wherein the opposing free ends of the gasket section are heated by a heat source selected from the group consisting of a heating oven, a hot air gun, and an IR heater.
9:
- The method of claim 7, wherein the relatively softer, rubber-like material is selected from the group consisting of EPDM, TPV and other TPE materials.
10:
- The method of claim 7, wherein the relatively harder, plastic-like material is a polyolefin.
11:
- The method of claim 10, wherein the relatively harder, plastic-like material is polypropylene.
12-16. (canceled)