Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1994-12-29
1996-10-08
Thurlow, Jeffery R.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
494901, 494921, 1563093, 26417317, 26417718, 428 368, 428 3691, 428138, 428515, 428517, E06B 716, B32B 2708
Patent
active
055629610
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a compound profile formed from a thermoplastic plastics material and an elastomeric material. More particularly, the invention relates to such compound profiles wherein the thermoplastic plastics material and elastomeric material are bonded by co-vulcanization.
In EP 0528560 A1 a thermoplastic plastics material on the one hand and an elastomeric material on the other hand are fed into a multi-component extrusion head and from this a combination is produced by co-extrusion. This co-extruded product is vulcanized immediately thereafter and is cooled. The plastics material eventually forms thin layers having a low coefficient of friction on those surface regions of a weather sealing strip which come into contact with a movable side window of a motor vehicle.
From EP 0501037 A2 it is known to feed the extrusion head of an elastomer extruder with a reactive urethane hot melt resin composition. The result is the same low-friction thin layers on those surface regions of a weather sealing strip which are arranged to come into contact with the side window of a motor vehicle.
Another known process of the type first referred to above (DE 37 37 891 A1) uses particular types of rubber and thermoplastic molding materials as elastomeric materials. It is to be noted that operating according to the two-stage extrusion process is expensive in terms of both time and labor.
DE 34 35 939 C1 shows that it is known per se in the treatment of elastomeric materials to use two shear head extruders which feed into a common extrusion head.
From DE-PS 2 059 496 is known an apparatus for the plastification of plastics material, particularly in an injection molding machine, in which two independently operating devices are provided for the production of heat for the plastification process. One of these devices is a shear device formed by a rotating core and supplying shearing heat.
From DE 31 18 429 A1 there is known a buffer strip of foamed polyurethane or polyvinyl chloride which is adhered by a pressure-sensitive adhesive coating on the one hand to a profile member of thermoplastic material and on the other hand to a liner.
From DE 38 35 211 A1 it is known to extrude from a common extrusion head made from a U-shaped clamping strip of hard rubber, a complete envelope around the clamping strip and with lips of soft rubber and a sealing tube of expanded rubber. The compound profile finally runs through a heating station and a hot air zone which completes the vulcanization.
From DE 36 27 537 A1 (embodiment shown in FIG. 1) it is known to extrude (embodiment shown in FIG. 3) on to an edge zone of a pivotable motor vehicle quarterlight a U-shaped profile strip of a polyurethane-based adhesive material with a central web. The profile strip includes an undercut groove into which a complementary retaining section of a push-in sealing profile can be pressed so as to be held there by the shape.
SUMMARY OF THE INVENTION
It is the object of the present invention to broaden the range of application of the process first mentioned above.
The invention provides a compound profile having a thermoplastic plastics material profile section and an elastomeric profile section of soft rubber. The thermoplastic and elastomeric sections are chemically bonded by a process of co-vulcanization. One embodiment of the invention provides a coupling material disposed between the thermoplastic and elastomeric sections to promote the chemical bond. It can be used if the desired chemical bond cannot be sufficiently achieved without the additional coupling layer of bonding material.
Another embodiment provides an additional elastomeric profile section of expanded rubber vulcanized to the elastomeric profile section of soft rubber.
By the means disclosed herein, it is possible to manufacture compound profiles of thermoplastic plastics material and elastomeric material in a cost-effective way and with continuous high qualitative values. The invention is particularly suited to the manufacture of sealing profiles in wh
REFERENCES:
patent: 4187270 (1980-02-01), Bartrum
patent: 4381273 (1983-04-01), Azzola
patent: 4595546 (1986-06-01), Wheeler, Jr.
patent: 5137675 (1992-08-01), Rabe
patent: 5256361 (1993-10-01), Keys
patent: 5267846 (1993-12-01), Miyama et al.
patent: 5334458 (1994-08-01), Powers et al.
patent: 5415822 (1995-05-01), Cook
Japanese Abstract vol. 5, No. 158 (M-091), "Preparation of Hose" Jul. 1981.
Japanese Abstract vol. 17, No. 368 (M-1443), "Manufacture of Weatherstrip" Sep. 1993.
Gummibereifung Jun. 1988, pp. 48 and 50 "Gummi-ein Werkstoff nach MaB".
Buchholz Hans-Volker
Hill Alistair
Meteor Gummiwerke K. H. Badje GmbH & Co.
Thurlow Jeffery R.
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