EP1039814B1 - Adhesive body - Google Patents

Abstract

An adhesive body, for the production of a junction with a foam material molded body during the molding process involving foam materials, has individual adhesive elements arranged on a support strip and covered to avoid the penetration of foam material with a covering. The covering is an adhesive material, adhering to the front side of the adhesive elements and can be removed therefrom to expose the adhesive elements. The adhesive body can be used at lower cost, can be in tight junction with the foam material molded body, and can guarantee with greater certainty that no foam material gets onto the adhesive elements during the foaming.

Description

The invention relates to an adhesive body, in particular for producing a Connection with a foam molded body during the molding process by means of foam material with individual, arranged on a carrier tape Adhesive elements used to prevent the penetration of foam material a flat cover means are covered to the outside.

In a known adhesive body according to EP 0 612 485 B1, this has the Foaming into the foam molded body using a conventional adhesive closure part, which is provided with interlocking elements on its front. On the An anchoring part is then located on the back of this adhesive closure part for anchoring the adhesive body in the surface of the foam to be foamed Foam molding. The interlocking elements mentioned are completely covered by a plastic sealing compound during foaming, after the molding process to expose the interlocking elements is deductible from these. On the hooking elements exposed in this way can then seat covers, upholstered body parts or the like. with the foam molded body be connected by the corresponding fastener parts, for example in the form of a loop band material or the like be brought with the interlocking elements. Because the plastic sealant the adhesive elements to be covered in the form of interlocking elements in a form-fitting manner encloses, considerable forces are required to cover the separate the adhesive elements, the relevant demolding forces can be greater than the connecting forces between the actual Adhesive body in the form of the adhesive fastener and the foam material. As a result together with the covering sealant, the tape-like one is also torn Adhesive body from the freshly foamed foam seat body, which makes this unusable can be. Even if the sealant is recyclable and for subsequent Molding operations are reusable is an appropriate amount used to handle sealant, which increases the cost of the known molding process.

It is already in EP 0 168 240 A2 with a generic adhesive body the hooking elements have been proposed in comparable molding processes of an adhesive fastener part on the front side only with a thin film cover so as to avoid penetration of the molding material; this leads to however, to expensive sealing measures in the edge area of the film, the one Connection with the top of the adhesive tape must enter what on the one hand the costs are increased again and on the other hand especially in the forehead area the tape-like fastener part leads to sealing problems with the Consequence that the foam material has the possibility, between the interlocking means penetrate. The interlocking elements surrounded by the foam material in this way then stand for the later attachment of cushion covers and Upholstery material is no longer available, which reduces the fixing options accordingly impaired. The film also comes off easily and tears, which leads to problems in practice.

Based on this prior art, the object of the invention based on further improving the known adhesive bodies so that they Can be used inexpensively and firmly connected to the foam molded body are as well as ensure with high security that no foam material reaches the hard elements during foaming. A pertinent one The object is achieved by an adhesive body with the features of claim 1.

Characterized in that the covering means according to the characterizing part of claim 1 is an adhesive that is on the end faces of the adhesive elements is in contact with the adhesive and exposes the adhesive elements again is removable, the adhesive elements are securely covered during foaming and the foam material cannot the hard elements when foaming glue and make it unusable. Because the glue on the adhesive elements are releasably adhesive, the tape-like or sheet-like Easily separate adhesive from the adhesive elements and it does not come to unwanted tearing of the adhesive body from the foam molded body. Incidentally, this adhesive covering agent is during foaming securely connected to the adhesive elements, so that unwanted tearing cannot happen.

The coating in the form of the adhesive can be made very thin, so that the required amount of material for the cover agent can be kept low can. This lowers the cost as well as the fact that that is used Bringing adhesive can be obtained cheaply on the market.

In a preferred embodiment of the adhesive body according to the invention the adhesive can be selected from hotmelt PSAs, in particular from the so-called hot-melt adhesives, the dispersion pressure-sensitive adhesives, preferably based on water-based phenolic resin or under the adhesive based on acrylate. The this type of adhesive is particularly characterized by a very good one Adhesive force on the plastic materials in question here. You are in other weather and water resistant and therefore very well able to unwanted penetration of the foam material is effective during the foam molding process to avoid. Although in the technical information sheets on these Adhesives have their strong adhesive property in the foreground, it is surprising for a specialist in the field of hard tape fasteners, that this differs from the adhesive elements of a corresponding adhesive fastener part can be easily released, provided that the adhesive elements are preferably not hook-shaped Have training, but are blunt on the front.

In a further preferred embodiment of the invention Adhesive body is on the side of the carrier tape opposite the covering means a loop material, preferably made of cotton, is present ensures a firm connection with the foam material. Preferably the loop material is arranged on a flat belt, the part of the Carrier tape or can be connected to this. With the above information it is possible, such a firm connection of the adhesive body to the foam material when foaming that neither when removing the adhesive cover when you later pull off a locking counterpart the foamed adhesive body part is separated from the foam material on the seat cover becomes.

In a further particularly preferred embodiment, the adhesive is a roll-on adhesive tape that faces away from the adhesive elements Outside with a removable magnetic film or a cover layer is provided with magnetizable particles, such as iron particles, or has a cover layer made of silicone. By designing the adhesive as a roll-on adhesive tape, the adhesive in the manner of a Film are processed and you need in the manufacture of the adhesive body no complex equipment, such as melting and application devices, any extruders to apply the cover foam. Rather, simple feed devices and a pressure roller are sufficient. If the adhesive body with a removable magnetic film or a cover layer is provided with magnetizable particles, the band-like Adhesive body over so-called whistles with magnetic holder simple and secure insert it into the mold and hold it in place so that it is in place during foaming into the mold not to warp or the like. can come. If a siliconized cover layer is provided, the adhesive tape assigns an adhesive layer on both sides and therefore also on the outside directly detachably connect to the mold or its parts, such as pipes leaves.

If the adhesive elements of the adhesive body consist of stem-like thickenings the carrier tape are formed, which are flattened on the end face or concave Have depressions, these can be formed extremely low in height and the rolling process of the adhesive during the manufacture of the adhesive body will be relieved.

Fig.1

in vergrößerter Schnittdarstellung eine erste Ausführungsform des Haftkörpers nach der Fig.1a;

Fig.2a,2b

in vergrößerter Darstellung eine geänderte Ausführungsform des Haftkörpers nach der Fig. 1;

Fig.3

eine Vorrichtung zum Herstellen des Haftkörpers.

The hard body according to the invention is explained in more detail below with reference to the drawing.
They show the principle and not to scale

Fig.1

an enlarged sectional view of a first embodiment of the adhesive body according to Figure 1a;

2a, 2b

an enlarged representation of a modified embodiment of the adhesive body according to FIG. 1;

Figure 3

a device for producing the adhesive body.

The adhesive body according to the invention is used in particular for producing a Connection with a foam molded body 10 during the molding process using foam material. This foam molded body 10 serve the Manufacture of foam blanks, in particular for vehicle and passenger seats and their parts, such as seat parts, backrests, armrests and headrests. This also includes complete seats, in which these individual components are combined in a seat structure. Depending on the producing molded body, a mold 12 or a molding box is provided, in which the foam material is introduced under pressure. After completing one Heat treatment in the form 12 and a subsequent cooling process can then the molded body 10 from the mold 12 for further processing be removed.

So that the foam moldings 10 produced in this way with a reference material or the like. can be provided, the adhesive body in the form of Ribbons inserted in the form 12 and foamed with. Correspondingly complementary trained fastener parts on the cover material (not shown) then act with the adhesive elements 14 of the adhesive body on the molded body 10 is fixed together and in this way attach the cover to the foam molded body 10th

The individual adhesive elements 14 are preferably on a carrier tape 16 arranged integrally with this. To avoid the unwanted Penetration of foam material are the adhesive elements 14 with a covering agent 18 covered.

The covering means 18 is an adhesive which, like in particular FIG and FIG. 2 show, lies on the adhesive elements 14 in an adhesive manner and has a constant, radial distance 20 between the adhesive elements 14 releases. The Covering means 18 in the form of the adhesive, which can be applied in the form of a film, is adhesive on the face on the adjacent opposite side of the Carrier tape 16 on. The adhesive can be selected from hot melt pressure sensitive adhesives, also known as hot melt adhesives, among the dispersion pressure sensitive adhesives, which are preferably based on aqueous phenolic resin, or under the acrylic-based adhesives.

In the embodiments, the cover means 18 is opposite Side of the carrier tape 16, a loop material 22, preferably made of Cotton, available, which is a firm connection with the foam material guaranteed during the foaming process. Between the loops of each Looping the loop material, which is arranged on a flat belt 24 the foam material penetrates and results in a firm bond, once the foam material has hardened.

The adhesive formed as a rollable adhesive tape has in one Embodiment on its outer side 28 facing away from the adhesive elements 14 a removable magnetic film 30 or comparable with a cover layer magnetizable particles (not shown), such as iron particles. The Removable magnetic film 30 ensures that the adhesive body in the form 12 is held by this having correspondingly designed receptacles 32, those with magnetic inserts, for example in the form of bar magnets (not shown) are provided. These receptacles 32 can be made from the shape 12 also be removed. When the molding process is complete, the magnetic film is 30 preferably deducted together with the cover 18 and the Adhesive elements 14 are released for their intended use.

The addressed adhesive elements 14 are made from stalk-like thickenings the carrier tape 16 formed, which are flattened on the end face and in longitudinal cross section seen taper cylindrically inwards. Other cross sections, such as rectangular, elliptical or the like, are possible. Furthermore, the stem-like thickenings concave depressions on their free end face (not shown). The adhesive elements 14 are preferably in one piece Part of the carrier tape 16 and formed from a plastic material.

A rational manufacturing process for the manufacture of a corresponding adhesive body is disclosed in DE 196 46 318.1. To produce the adhesive body with the plurality of adhesive elements formed in one piece with the carrier tape 16 14 in the form of the thickened stem becomes a thermoplastic Plastic in a plastic or liquid state a gap between one Printing roller and a form roller (not shown) fed, both Rollers are driven in opposite directions, the form roller has a sieve with cavities open to the inside and outside, whose cavities correspond to the outer contour of the stem-like adhesive elements 14 and the thermoplastic penetrates into the sieve and there at least partially hardened. The adhesive elements 14 produced in this way are only very low in height and close together. So it's not possible that the adhesive in the form of the cover 18 in the distances 20 engages between the adhesive elements 14, which ultimately the removal of the Cover means 18 relieved by the adhesive elements 14.

3 schematically shows the device with which the adhesive body can be made. Between two rubber covering rollers 38, which are in the direction of the arrow circulate, the magnetic foil 30 or the iron-containing paper is passed through, the on the underside of the magnetic film 30 or the paper Cover means 18 runs in the form of the adhesive tape. Before the passing one Compound between the two rubber covering rollers 38 passes through peel off the adhesive protective paper 40 and, as in FIG 3, correspondingly wound on a take-up roll 42. Parallel for this purpose, the unwinding roller 44 is the carrier tape 16 with the outside protruding adhesive elements 14 processed. The view towards Fig.3 seen upper rubber covering roller 38 then presses the adhesive covering 18 on the carrier tape 16 and the finished, already described wide fabric is produced 46, as shown in more detail in Figures 1 and 1a.

When manufacturing the adhesive bodies, you are not bound to Use strip materials as narrow goods. Rather, everyone can Components of the laminates described above are produced as so-called broad goods and be put together, and indeed up to a width of about 1.5 m, then from this wide fabric 46 one by cutting or parting off on a Roll cutting machine or the like Bands of any width and width configuration can get. By punching, water jet cutting or using a laser complicated two- and three-dimensional shapes for the Achieve seat design. Before use in the foam mold 12 is also omitted the processing of the cut edges by gluing or welding, so that directly from the respective supply roll 44 the material can be fetched what is again very inexpensive.

In the embodiment according to FIGS. 2a, 2b, FIG. 2a relates to a top view on the cover 18 and Figure 2b a related side view. Lies the adhesive covering means 18 over the entire surface of the adhesive elements 14 relatively high peeling forces necessary for the covering means 18 by hand. Around to facilitate this removal process is in the embodiment according to the 2a, 2b provided to roll in a non-adhesive strip 50 which to lie between cover means 18 and adhesive elements 14 to be covered comes. Since there is no adhesive at the locations of the non-adhesive strip 50 Contact between the cover 18 and the adhesive elements 14 for To carry, is the peeling process for the cover 18 by hand facilitated. The non-adhesive strip 50 can be introduced as a strip or film be, or, as shown in FIG. 2a, the covering means at defined intervals 18 spanning.

Furthermore, as shown in FIG. 2a, the covering means 18 can have a crosswise to be provided in its longitudinal direction handle 52 which is an attack aid for the peeling process. Seen in the direction of Fig.2a is then viewed from the handle 52, the cover 18 right-justified glued to the adhesive elements 14 and left-aligned left. The adhesive can cure independently to form an adhesive film or as a coating of a thin film, the connection to the adhesive elements 14 manufacture.

Claims (8)

1. Adhesive body, especially for making a bond with a foamed plastic moulded body (10) during the moulding process by means of a foamed plastic material with individual adhesive elements (14) arranged on a carrier strip (16) which are covered with an outer flat covering (18), characterised in that the covering (18) is an adhesive which adheres to the front faces of the adhesive elements (14) and is removable from them by uncovering the adhesive elements (14).
2. Adhesive body according to Claim 1, characterised in that the adhesive can be selected from hot-melt adhesives, dispersion adhesives, preferably on a watery phenol resin base or from adhesives on an acrylic base.
3. Adhesive body according to Claim 1 or 2, characterised in that loop material (22), preferably of cotton, is provided on the side of the carrier strip (16) opposite to the covering (18), guaranteeing firm connection with the foamed material.
4. Adhesive body according to Claim 3, characterised in that the loop material (22) is arranged on a flat strip 24 which is part of the carrier strip (16) or connectable with it.
5. Adhesive body according to one of the Claims 1 to 4, characterised in that a partly non-adhesive covering material, especially in the form of a non-adhesive strip (50) is arranged between the covering (18) and the adhesive elements (14).
6. Adhesive body according to one of the Claims 1 to 5, characterised in that the adhesive forms a roll-coatable adhesive strip which has on its outer side facing away from the adhesive elements (14) a removable magnetic foil (30) or a cover layer with magnetisable particles, or a siliconised cover layer (48).
7. Adhesive body according to one of the Claims 1 to 6, characterised in that the adhesive elements (14) are formed by stalk-like swellings on the carrier strip (10) which are flattened or have concave depressions at the end.
8. Adhesive body according to one of the Claims I to 7, characterised in that the covering (18) is provided with a grip (52) to facilitate removal.

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