DE1504078B1 - Apparatus for producing a sheet-like cushioning material containing air-filled cells - Google Patents

Description

The invention relates to a device for producing a web-shaped, cushioning material containing air-filled cells by connecting an embossed Foil with a flat foil made of thermoplastic material or an air-impermeable, coated paper by means of an adhesive consisting of an embossing device, the embossing rollers of which have recesses that can be connected to a suction device, and two spaced apart feed devices for the two Foils and an adhesive application roller for applying adhesive to at least the ridges of the embossed film.

Known devices of this type are provided with an extrusion nozzle, from which a hose made of thermoplastic material with simultaneous feed is guided by blown air inside this hose between two embossing rollers which are provided on their circumference with recesses connected to a suction device are and with simultaneous embossing of at least one side of the hose Weld these together to form a flat two-layer padding material. The production required for the formation of the cells in the cushioning material to be produced Embossing in at least one side wall of the still from its manufacture The warm, flexible hose is mainly carried out by the hose that is blown in Air overpressure exerted on the hose wall to be embossed. Such devices are disadvantageous because they only involve the production of two-layer cushioning material with coincident texture of both layers and because of the with them taking place injection molding process only with a comparatively low working speed are operable.

These disadvantages can also not be addressed in a satisfactory manner balance. that according to a known modification of the aforementioned known device instead of a hose made in the device itself, a through the Gluing together the longitudinal edges of two artificially produced plastic sheeting Hose in the rest of the same way, namely with predominant use of Blown air overpressure for the deformation of the web to be embossed is processed. Included an additional device and an additional device to be carried out on this Operation required. namely the device for welding the edges together of the two separately fed film webs and the operation to be carried out on them. This makes the production of the cushioning material more expensive, so that its competitiveness with the previously known upholstery material made of paper or the like. Is impaired. The further disadvantage of these known devices also acts in the same direction from the fact that in their use necessarily those for the penetration of air cells available area of the film webs is reduced by the surface part. which is required for welding or gluing the webs together at their longitudinal edges will.

In a likewise known device for producing a from embossed E-plastic sheeting of existing upholstery material is used Place of the blown air overpressure used in the above-mentioned devices for performing the deformation work for the embossing process the mechanical pressing force of two toothed rollers, which are connected to one another via their axially parallel peripheral teeth are in engagement and the previously heated web to be deformed between them Pick up teeth with suction nozzles between the teeth. the deformation process should support. The union of the wavy embossed, with a smooth one or also wave-shaped embossed film web is thereby applied by a Adhesive on the one lying on the outer edges of the teeth of the embossing roller Foil web and the subsequent pressing of the other foil web onto the one with adhesive application causes provided points of the first film web on the circumference of the embossing roller. With this device, no closed air cells can be found in the cushioning material produce. but only open transverse waves on both sides. so a product without the particularly favorable elastic properties of the closed air cells containing upholstery material. Furthermore, the passage of the warm, malleable Foil web between the teeth of the rollers easily damaged the web as a result the almost inevitable occurrence of excessive surface pressures. those of the themselves against each other rolling tooth profiles are exerted on the web. This difficulty results in a corresponding reduction in the operating speed of the device.

The invention l is based on the object of providing a device for Manufacture of a sheet-like cushioning material containing air-filled cells indicate that the aforementioned disadvantages of the known devices are more similar Art avoids and especially a high Arbeitsgeschwilldigkeit with trouble-free Operation with simple structural means enabled.

This object is achieved according to the invention in that in a Device of the type specified at the beginning, the embossing device only has an embossing roller having. at least one smooth feed roller on its circumference for the to embossing film, a feed and pressure roller for those with the embossed film Foil to be connected and a guide roller for removing the finished cushioning material assigned.

Among other things, this is based on the Erkemituis. that for the manufacture of railway-approved. cushioning material containing closed air cells made of foils made of thermoplastic plastic, the one previously considered to be indispensable Exercise of the pursuit work for the embossing process by blowing air pressure or mechanical Pressing or rolling processes through the exclusive use of the previously only for support the said other deformation means used suction. those of the Depressions of the embossing roller is exerted on the film. can be replaced and is not only sufficient to achieve a flawless product. but about it In addition, a considerable increase in the working speed of a corresponding trained device compared to the known devices in anyway Trouble-free operation can be achieved.

The adhesive force acting between the films can be increased can be achieved advantageously in that the feed and pressure roller for application of glue to the one with the embossed film foil to be connected a second adhesive application roller is assigned.

It is useful for processing some plastics that before the smooth feed roller is a heating device traversed by the foil to be embossed is arranged.

The device according to the invention is explained in more detail with reference to the drawing explained. 1 shows a schematic representation of a device for manufacturing of a sheet-like cushioning material containing air-filled cells, FIG. 2 a partial section according to FIG. 1, on an enlarged scale, FIG. 3 another Partial section according to FIG. 1, on an enlarged scale.

F i g. 4 shows a plan view of the cushioning material produced and FIG. 5 shows a section along the line 5-5 in FIG. 4.

The device according to the F i g. 1 to 3 has one with negative pressure working embossing roller 10, in the surface of a plurality of depressions 11 is present, into which the film to be embossed 12 is drawn over by the suction of air Openings 10 ′ extending from an inner chamber to the outer surface of the roller are drawn in will. The embossing roller 10 is driven and preferably at about room temperature held.

The film to be embossed 12 has a continuous shape and is through a Heating device 13 heated.

The heated film is fed over a feed roller 14 which is arranged from the embossing roller 10 at a distance which is approximately equal to the thickness the slide 12 is. When the film 12 hits the surface of the roller 10, it sucks the negative pressure applied to the roller pushes the film into the depressions 11, which can be any shape or shape desired. These depressions 11 are shown in the drawing as uniform depressions for the sake of simplicity shown. With the rotation of the roller 10, which, as shown, is clockwise rotates, the film 12 is held in the recesses 11 present in the roller 10 and passes an adhesive application roller 15.

The lower section of the roller 15 extends down into a container 16, in which there is a supply of adhesive 17. The glue gets off the surface the roller 15 received and on the outside of the existing on the roller 10 Slide 12 delivered. Since parts of the film 12 are drawn into the depressions 11 and since the roller 15 is actually equivalent to a mold section, the Adhesive 17 delivered only to the raised areas of the embossed film.

After the adhesive has been applied to the film 12, the aid of a pair of feed and pressure rollers 19, 20, an air-impermeable film 18 made of plastic, paper or any other film material applied as a base. The rollers 19 and 20 are approximately the same thickness as the film 18 apart from one another, an equal distance being provided between the roller 20 and the embossing roller 10 is.

However, it is useful between the roller 20 and the embossing roller 10 to produce at least a low pressure, so that the film 18 when it is applied is pressed against the film 12 and adheres firmly to it. The finished layered Padding material 21 then runs around the remainder of the roller 10 and is over guide rollers 22 and 23 continued.

The adhesive 17 is dependent on the type of foils 12 and 18. the Foil 12 is preferably made of plastic, with a sufficient amount of plasticizer, so that the finished cushioning material 21 is pliable and yet retains its character.

The film 18 for the base is preferably a treated or coated paper of greater thickness and rigidity than film 12, although of course other types of material can be used equally well, with the thickness and properties the layers should be coordinated so that a workable self-supporting Padding material is achieved. In some cases, the use of a usual Paper as mechanical support for the thin film may be desirable to prevent the warping to prevent the embossing while the covering is being attached. In this case causes the covering to be attached to the surface using a suitable adhesive entrapping air in the embossed portions so that an effect is achieved that of the effect achieved by the use of an impermeable film 18 is similar.

In the F i g. 4 and 5 is a layered embossed cushioning material shown. The cushioning material 21 has valleys 24 in the embossed area. 5 shows a cross section through the cushioning material, it being noted that that only the valleys 24 are glued with dci film 18 and so a large number of between the valleys 24 arranged air pockets 25 remains.

In the setup described above, the adhesive 17 applied to the film 12.

If desired, however, the adhesive can be applied by means of an adhesive application roller 15 'are applied to the film 18, the adhesive 17' in a container 16 'is included. In certain cases it may be desirable in a separate To apply adhesive to the film 18 that is sensitive to heat or pressure and only then glue the prepared film 18 onto the embossed film 12.

Claims (3)

Claims: 1. Device for producing a web-shaped, cushioning material containing air-filled cells by connecting an embossed Foil with a flat foil made of thermoplastic material or an air-impermeable, coated paper by means of an adhesive, consisting of an embossing device, the embossing rollers of which have recesses that can be connected to a suction device, and two spaced apart feed devices for the two Foils and an adhesive application roller for applying adhesive to at least the elevations of the embossed film, characterized in that the embossing device has only one embossing roller (10) which has at least one smooth feed roller on its circumference (14) for the film to be embossed (12), a feed and pressure roller (20) for the film (18) to be connected to the embossed film (12) and a guide roller (22) are assigned to divert the finished cushioning material. 2. Apparatus according to claim 1, characterized in that the feed and pressure roller (20) for applying adhesive to the embossed film (12) foil to be connected (18) a second glue application roller (15 ') is assigned. 3. Apparatus according to claim 1 or 2, characterized in that in front of the smooth feed roller (14) one of the foil to be embossed (12) passed through Heating device (13) is arranged.