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TPV Process with Softened Rubber Feeding into a Continuous Mixer

IP.com Disclosure Number: IPCOM000244740D
Publication Date: 2016-Jan-06
Document File: 4 page(s) / 248K

Publishing Venue

The IP.com Prior Art Database

Abstract

A novel process for fabrication of dynamic vulcanized alloy (DVA) or thermoplastic vulcanizate (TPV) was developed. The inventive TPV process consists of a direct feeding step of soften rubber into dynamic vulcanization equipment such as twin screw, multi-screw or single screw extruders.

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TPV Process with Softened Rubber Feeding into a Continuous Mixer

Abstract: A novel process for fabrication of dynamic vulcanized alloy (DVA) or thermoplastic vulcanizate (TPV) was developed. The inventive TPV process consists of a direct feeding step of soften rubber into dynamic vulcanization equipment such as twin screw, multi-screw or single screw extruders.

Background

The dynamic vulcanized alloy (DVA) or thermoplastic vulcanizate (TPV) consists of at least one rubber component and at least a plastic component. The rubber component(s) are crossed-linked and finely dispersed into the plastic matrix during the DVA or TPV fabrication process. One of the fabrication processes is to feed the rubber and plastic as well as other components into a continuous mixing equipment such as a twin screw extruder (as described in US Patents US4,594,390 and US7,655,728) Typically the rubber is in a bale form and will be granulated into small size crumbs. Subsequently the granulated rubber crumbs in the solid form can be metered and fed into the continuous mixer using a conventional feeder such as screw feeder or belt feeder.

The above mentioned rubber granulation and subsequent blending and feeding process are relatively complex. The inventive process is to feed the rubber in softened state into a continuous mixer for DVA or TPV fabrication. One of the approaches is to utilize a rubber bale mastication and feeding device (e.g., as available from the Bonnot Company) for this inventive development.

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