DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Referring first to FIGS. 1 and 2, a strip 1 which will eventually become a vehicle window guide channel is extruded from a thermosetting polymeric material such as EPDM in a traditional “rubber”0 extruder 3 (the first extruder) to have the general shape as shown in FIG. 2A. This rubber extrusion step is carried out at a temperature in the range of about 80° C. to 150° C. using state of the art equipment and techniques. On emerging from the first extruder 3, the strip 1 is passed through a standard curing tunnel 5 where it is supported on a fluidised bed of hot glass beads; the vulcanised extrusion emerges from the tunnel 5 in a semi-cured state, and at a temperature within the range of 180° C. to 250° C.

[0032] The strip is then opened out into the shape shown in FIG. 2B and passed into a second extruder 7, where a thermoplastics material 8, ideally EPDM modified polypropylene, is extruded onto surface areas 9, 11, 13 and 15 of the still hot strip 1. Due to the residual heat of the thermosetting material of the strip 1, and due to the fact that the temperature of the thermoplastics material in the extruder 7 is in the range of 140° C. to 250° C., the thermosetting material of the strip 1 and the thermoplastics material 8 bond together.

[0033] Immediately on emerging from the extruder 7, the composite extrusion is passed through a cooling station 19 partially to cool the exposed surfaces of the thermoplastics material, so that the surfaces are no longer tacky, and the extrusion is then fed into a forming and cooling die 17, where it is folded from its “opened out” state of FIG. 2B into the shape shown in FIG. 2C. The extrusion is then held in this position, and cooled virtually to room temperature, so that it will be formed into its required final shape shown in FIG. 2C.

[0034] To use the strip, it is located in a groove in a vehicle door or door frame by a retention part 20, and is held by the walls of the groove in the position shown in FIG. 2C. The strip is designed to act as a guide for a sliding window, with the edge region of the glass being located between the strips of thermoplastics material 8 which are firmly bonded to the surfaces 9, 13 and 15, and its edge abutting the material 8 on the surface 11.

[0035] It will of course be appreciated that while the main body of the strip 1 is formed of a thermosetting black rubber material, the portions 8 are formed of a different thermoplastics material which can be of any desired color (e.g. to color match a vehicle's paintwork) and can have the more rigid, and more slippery porperties requied to locate an edge region of a vehicle window. However, the portions 8 on the surfaces 9 and 15 will be biassed into sealing engagement with the glass, due to the resilient nature of the strip 1 on which the portions 8 are supported.

[0036] It will be appreciated that the composite extrusion could be of a different cross-section such as shown, for example, in FIG. 6. In this embodiment of the invention, a generally U-shaped edge trim is formed in a modified first rubber extruder, the edge trim having a U-shaped body 70 formed of EPDM, SBR, a blend of the two, natural rubber, neoprene or another thermosetting material, the body having formed integral therewith a plurality of small and large flange gripper fins 72 of any desired number and configuration, a hollow sealing bulb 74, a flap seal 7S, and a secondary seal 76 with subsidiary sealing fin 78. The bulb 74, seal 76 and fin 78 are formed of a foamed rubber in known manner, and the tip 80 of the outermost one of the larger of the fins 72 may also be foamed. Located within the U-shaped body is a metal carrier 82, which may be of known construction (e.g. knitted wire, or slotted or stamped metal). The technology to extrude the combined U-shaped edge trim with integral sealing bulb 74 is known and after it has been passed through a curing bed 5, the vulcanised rubber extrusion, while still hot, is then passed through a second extruder, so that a layer of thermoplastics material 84 can be extrusion coated onto what will be the exposed face of the edge trim.

[0037] The temperature in the rubber extruder should be in the region of 100° C., the curing bed can be a fluidsed bed, or microwave oven, or salt bath, or hot air, at a temperature of around 205° C., and after being hauled from the first extruder and washed, it is passed through the second extruder where the thermoplastics material is extruded onto it at a temperature in the range of 120° C. to 180° C. The thermoplastics material can be of any desired color, and after being cooled, it can be “post formed” to the required profile, and/or embossed if required. Furthermore, after cooling, a high gloss coating can be sprayed onto the thermoplastics material to improve its surface appearance, and its scuff resistance.

[0038] The thermoplastics material may be a blend of 90% Santoprene/10% polypropylene (or in any other ratio), or 100% Ethylene Vinyl Acetate (EVA), or a blend of the two.

[0039] Referring now to FIGS. 3A to 3C, FIG. 3A shows an extrusion of a thermosetting material somewhat equivalent to that shown in FIG. 2A but of an entirely different product and having a flap seal 21 and a securing portion 23 which as is the case with the construction shown in FIG. 2A, is initially extruded from a thermosetting material in an “opened out” form. After being extruded in a conventional rubber extruder such as the extruder 3 shown in FIG. 1, the rubber extrusion is partly cured using a standard curing technique such as a curing bed 5, whereupon, as is the case in FIG. 2C, a thermoplastic elastomer reinforcement strip 25 is extruded onto a main part 27 of the securing portion 23, while the latter is still hot, so as to form a firm bond therewith using a second plastics extruder 7.

[0040] In contrast to the embodiment of the invention shown in FIG. 2C, the composite extrusion shown in FIG. 3B is then passed through a forming and cooling die 19 without first being cooled so as to cause arm portions 29 and 31 which are formed of thermosetting material to be moved from their opened out position shown in FIG. 3A and 3B to a folded in position in abutting relationship with the exposed surface of the thermoplastic material 25, as shown in FIG. 3C. The forming operation performed by the forming and cooling die 19 is performed at an elevated temperature prior to any cooling step so that the inner face at least of the arms 29 and 31 and the outer face of the thermoplastic material 25 will still be hot so that when the faces are brought into abutting relationship with each other, they will bond together. As the extrusion continues through the forming and cooling die, so the temperature of the die is reduced, thus cooling the composite extrusion to a temperature in the region of 40° C. so as to maintain the extrusion in the form illustrated in FIG. 3C. By selecting an appropriate polymer for the thermoplastic material 25, the characteristics of the securing portion 23 can be modified as required. For example, by choosing a polymer which at a temperature of about 40° C. is semi-rigid, the otherwise resiliently deformable securing portion 23 can be considerably stiffened.

[0041] Two alternative constructions of the second embodiment of the invention are illustrated in FIGS. 4A to 4C and SA to SC respectively and component parts of the extrusions shown in these Figures which correspond with component parts in FIGS. 3A to 3C bear the same reference numerals.

[0042] Referring first to FIGS. 4A to 4C, the seal shown therein really only differs from that of FIGS. 3A to 3C in that it has a flap seal 41 and a subsidiary flap seal 43 instead of the flap seal 21, and in that the main body 23 is generally U-shaped. A thermoplastic strip of material 45 is extruded onto the previously extruded body 23 of thermosetting material but, in this case, it extends beyond the body 23 and terminates in an enlarged locking head 47, and only one arm 49 is provided which is folded over the hot extruded strip of thermoplstic material 45 while it is still hot so as to form a bond therewith.

[0043] The extrusion shown in FIGS. 5A to SC has a final shape as shown in FIG. 5C and is intended to be used as a combined edge trim and door seal for fitting on a flange around a door opening on a motor car. The extrusion has a generally U-shaped flange gripping body portion 53 formed of thermosetting polymeric material and a hollow sealing portion 54 also formed of a thermosetting polymeric material which may be softer than the material of the flange gripping portion 53. This can be achieved by using the same thermosetting material, but foaming it.

[0044] The first stage in the formation of the composite extrusion is not illustrated in the drawings, but it comprises the extruding of the thermosetting body portion 53 and sealing portion 54 in a single extrusion step using a first rubber extruder, but with the body portion 53 being in an opened out state and having a generally flat base 55, with arm portions 57 and 59 extending from the edge regions of the base portion 55 and extending at an angle of about 80° thereto, both on the same side of the base portion 55. A pair of spaced gripping fins 61 extends outwardly from the arm 57 and a further pair of spaced gripping fins 63 extends outwardly from the arm 59, the fins 63 being somewhat thicker and less deformable than the fins 61. The general shape of the first extrusion of thermosetting material is shown in FIG. 5A, but FIG. 5A shows the extrusion after it has been passed through a curing station and largely cured and after a strip of thermoplastic material 25 has been extruded onto the face of the flat base 55 so as completely to cover the face between the arms 57 and 59. This extrusion step is performed by a second, plastics extruder while the thermosetting material is still hot, so that the thermoplastic material 25 will bond to the face of the base 55 and is equivalent to the steps shown in FIGS. 3B and 4B of the previous ver˜ions of the invention.

[0045] Immediately after the thermoplastics material 25 has been extruded onto the face of the base 55 and while both materials are still hot, the arms 57 and 59 of thermosetting material are folded inwardly in the direction of the arrows A as shown in Figure SA until the inner faces of each arm abut the outer face of the thermoplastic material 25 and the free end portions of the arms 57 and 59 abut each other. Because the materials are still hot they will bond with each other.

[0046] Subsequent to this, the partially formed composite extrusion is passed through a forming and cooling die which progressively forms the extrusion into the shape shown in FIG. 5B and then on into the final shape shown in FIG. 5C. By choosing an appropriate thermoplastic material 25, which in the end product is totally encapsulated within thermosetting material of the flange gripping portion 53, a large degree of rigidity can be imparted to the flange gripping portion 53 in transverse planes through the flange gripping portion, thus maintaining the U-shape of the flange gripping portion and allowing it strongly to grip a flange to which it is fitted.

[0047] It will thus be appreciated that the various versions of the second embodiment of the invention which are illustrated in FIGS. 3A to 3C, 4A to 4C and 5A to 5C are provided with an internal reinforcement or stiffened carrier 25 which is non-metallic but which, by choosing the correct material, can have strenthening and stiffening properties normally associated with a metal carrier, but which does not have the undesirable properties of a metal carrier, namely a relatively high weight and a tendency to rust.

[0048] Instead of only partially curing the thermosetting extrusion, it can be normally cured and reeled, and in a subsequent operation, it can be heated to a temperature within the range of about 180° C. to 250° C., and then be passed into the further extruder to have the thermoplastic material extruded onto it; the final steps would then be undertaken in a similar manner to those described with reference to the drawings. It has been found that a satisfactory bond can be achieved by taking a reeled thermosetting extrusion extruded up to two weeks earlier, provided it is heated adequately before passing it into the second, plastics extruder.

[0049] It will thus be appreciated that this invention enables a rubber extrusion to be matched to the interior of an automobile or the exterior paintwork of an automobile, or to the interior or exterior decor of a building by extruding a thermoplastics material onto its surface. In order to obtain the long term performance characteristics, such as ozone resistance, low temperature properties and compression set on automobile, domestic or industrial weatherstrips, a cross-linked thermosetting polymeric material is necessary for the main body of the weatherstrip.

[0050] Traditionally, extruded rubber seals have had to be bonded by use of adhesives to a colored thermoplastic extrusion, which matches the interior and exterior of an automobile or building. Such combination seals have to pass through three discrete and different production processes, namely rubber extrusion, plastic extrusion, and combining the two with adhesives. Each process generates wastage and uses labour, and rubber extrusions are difficult to bond to thermoplastic materials and have therefore to be prepared to render them compatible. Some of the procedures are:

[0051] 1. Surface grinding to afford a clean surface on the rubber extrudate.

[0052] 2. Flame treating the surface of the rubber to change the polarity.

[0053] 3. Corona treatment of the rubber, plastic or both surfaces.

[0054] 4. Use of two-part urethane adhesives, high melt point, hot melt adhesive, or cross-linking hot melt adhesives to adhere the two substrates.

[0055] The invention described eliminates several stages of the combining process through the ability to extrude a decorative thermoplastic film directly onto a rubber extrudate, thereby giving a cheaper product, simpler manufacturing process, and reduced floor space useage.

[0056] Such seals are more economical than fabric covered seals, due to the elimination of expensive fabrics.

[0057] In the second embodiment of the invention, it is possible to form the extrusion so that the thermoplastics material is located internally of the thermosetting material, which by choice of a suitable thermoplastics material, can act as a stiffener, and replace the traditional metal carrier provided for stiffening purposes.

[0058] When the thermoplastics material is to be located on the surface of the composite extrusion, it is preferred that its stiffness or hardness (or flexibility) should approximately match that of the thermosetting material, and be in the region of Shore-A 70° to Shore-A 55°. However, when it is to be located within the thermosetting material in the end product, it would normally be stiffer or harder than the thermosetting material, and could have a hardness in the region of Shore-D 50° to Shore-D 60°.

[0059] It will of course be understood that the various embodiments of the present invention have been described above purely by way of example, and modifications of detail can be made within the scope of the invention.