DE1479023B2 - PROCESS FOR HIGH-FREQUENCY WELDING OF POORLY WELDABLE PLASTICS - Google Patents

PROCESS FOR HIGH-FREQUENCY WELDING OF POORLY WELDABLE PLASTICS

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Publication number
DE1479023B2
DE1479023B2 DE19631479023 DE1479023A DE1479023B2 DE 1479023 B2 DE1479023 B2 DE 1479023B2 DE 19631479023 DE19631479023 DE 19631479023 DE 1479023 A DE1479023 A DE 1479023A DE 1479023 B2 DE1479023 B2 DE 1479023B2
Authority
DE
Germany
Prior art keywords
welding
materials
powder
frequency welding
cardboard
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE19631479023
Other languages
German (de)
Other versions
DE1479023A1 (en
Inventor
Karl Heinz 4000 Dussel dorf Benrath Stukenbrock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stockhausen GmbH and Co KG
Original Assignee
Chemische Fabrik Stockhausen GmbH
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Filing date
Publication date
Application filed by Chemische Fabrik Stockhausen GmbH filed Critical Chemische Fabrik Stockhausen GmbH
Publication of DE1479023A1 publication Critical patent/DE1479023A1/en
Publication of DE1479023B2 publication Critical patent/DE1479023B2/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/56—After-treatment of articles, e.g. for altering the shape
    • B29C44/5618—Impregnating foam articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/486—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by their physical form being non-liquid, e.g. in the form of granules or powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/727—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being porous, e.g. foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/748—Joining plastics material to non-plastics material to natural products or their composites, not provided for in groups B29C66/742 - B29C66/746
    • B29C66/7484—Leather
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/748—Joining plastics material to non-plastics material to natural products or their composites, not provided for in groups B29C66/742 - B29C66/746
    • B29C66/7485—Natural fibres, e.g. wool, cotton
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/748—Joining plastics material to non-plastics material to natural products or their composites, not provided for in groups B29C66/742 - B29C66/746
    • B29C66/7486—Paper, e.g. cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
    • B29K2033/04—Polymers of esters
    • B29K2033/08—Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
    • B29K2033/04—Polymers of esters
    • B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2313/00—Use of textile products or fabrics as reinforcement
    • B29K2313/02—Use of textile products or fabrics as reinforcement coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/12—Paper, e.g. cardboard
    • B29K2711/123—Coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products

Description

Die Erfindung betrifft ein Verfahren zum Hochfrequenzschweißen von schlecht schweißbaren Kunststoffen, beispielsweise Polyurethanschaum, mit nicht schweißbaren Stoffen, wie Hartpappe, Karton, Papier oder Textilien, durch Einbringen eines Schweißhilfsmittels aus thermoplastischem Kunststoff mit hohem Verlustfaktor zwischen die zu verbindenden Materialien. The invention relates to a method for high-frequency welding of poorly weldable plastics, for example polyurethane foam with non-weldable materials such as hard cardboard, cardboard, paper or textiles, by introducing a welding aid made of thermoplastic material with a high Loss factor between the materials to be connected.

Beim Hochfrequenzschweißen von schlecht schweißbaren Kunststoffschäumen, z. B. Polyurethanschaum, mit artfremden Stoffen, wie Textil, Papier, Karton oder Schaumstoff, kann die Schweißfreudigkeit durch Verwendung einer PVC-Folie, die als Schweißmittel dient und zwischen Schaumstoff und artfremdes Material gelegt wird, erhöht werden. Dieses Verfahren läßt zwar gute Schweißeffekte erzielen, doch hat es sich als zu teuer erwiesen.When high-frequency welding of poorly weldable plastic foams, z. B. polyurethane foam, with alien materials, such as textiles, paper, cardboard or foam, the willingness to sweat can be reduced by using a PVC film, which serves as a welding agent, and between foam and alien material is placed. This process can achieve good welding effects, but it has proven to be too expensive.

Eine weitere Möglichkeit ist durch Aufbringen eines Schweißklebers gegeben, der ein in Lösemitteln, beispielsweise Essigester, gelöstes PVC darstellt. Mit einer solchen Lösung kann wahlweise der Schaumstoff oder ein anderes nicht schweißbares Material, aber auch beide Materialien, präpariert werden. Auch dieses Verfahren hat mehrere Nachteile. Die Herstellung und Anwendung des Klebers erfordert größeren technischen Aufwand. Hinzu kommt, daß sich die Klebelösung nicht in allen Fällen wirtschaftlich gleichmäßig und sauber auftragen läßt; dies trifft insbesondere dann zu, wenn die Materialien nicht ganzflächig, sondern nur in Bahnen besprüht werden. Another possibility is given by applying a welding adhesive, which is a solvent, for example ethyl acetate, dissolved PVC represents. With such a solution, the foam or another non-weldable material, but also both materials, can be prepared. Even this method has several disadvantages. The manufacture and application of the adhesive requires larger ones technical effort. In addition, the adhesive solution is not economical in all cases can be applied evenly and cleanly; this is particularly true when the materials are not sprayed over the entire surface, but only in strips.

Es ist ferner bekannt, Faserstoffe, Gewebe, Textilien, Leder, Filz od. dgl., die mit Kunststoffen verbunden werden sollen, durch Tränken oder Besprühen mit einem für die Kunststoffe geeigneten Lösungsmittel schweißbar zu machen. Beim Reparieren oder Verbinden von Kunststoffolien ist es ferner bekannt, die Folien mit einer Dispersion oder Lösung aus PVC zu bestreichen und nach dem Auflegen einer Abdeckfolie durch einen Schweißgriffel, ein lötkolbenartiges Gerät, das vor dem Arbeitsgang erhitzt wird, so weit zu erwärmen, daß die Folie erweicht und die Verbundschicht zum Schmelzen und Gelieren gebracht wird.It is also known fiber materials, fabrics, textiles, leather, felt or the like. Associated with plastics are to be, by soaking or spraying with a suitable for the plastics To make solvent weldable. It is also used when repairing or joining plastic films known to coat the films with a dispersion or solution of PVC and after application a cover sheet by a welding pen, a soldering iron-like device, which before the operation is heated to heat so far that the film softens and the composite layer to melt and Gelling is brought about.

Diese Verfahren, soweit sie sich überhaupt mit der Erfindung vergleichen lassen, sind wegen der erforderlichen Mengen an Tränkungs- und Lösungsmittel erheblich zu teuer.These methods, insofar as they can be compared at all with the invention, are necessary because of the Amounts of impregnation agent and solvent are far too expensive.

Ein weiteres Verfahren zum Hochfrequenzschweißen von Schaumstoffen wird mit Hilfe von in PVC-Lösungen getränkten oder beschichteten Papieren, insbesondere Seidenpapier, ermöglicht. Die Erfindung verringert gegenüber der vorgenannten Verfahren den Verbrauch an PVC. Das Schweißmittel kann hiernach auch als Band ausgebildet sein. Dieses Verfahren besitzt jedoch die Nachteile, daß das Schweißhilfsmittel an den Nähten eine deutliche Versteifung bringt, daß das Zuführen der Bänder und Bahnen einen maschinellen Aufwand erfordert und daß die Gefahr des Verschiebens, insbesondere der Bänder, nicht ganz ausgeschaltet werden kann. Dieses Verfahren erlaubt nur das Anbringen von geraden Nähten, während das Schweißen von Ornamenten die Verfahrensweise bedeutend erschweren würde, indem das Schweißhilfsmittel vorher auf eines der zu verschweißenden Materialien geklebt werden muß.Another method for high-frequency welding of foams is carried out with the help of in PVC solutions impregnated or coated papers, in particular tissue paper, allows. The invention reduces the consumption of PVC compared to the aforementioned process. The welding agent can then also be designed as a band. However, this method has the disadvantages that the Welding aid at the seams brings a significant stiffening that the feeding of the tapes and Railways requires a mechanical effort and that the risk of displacement, especially the Tapes, cannot be turned off entirely. This method only allows straight lines to be attached Seams, while the welding of ornaments would complicate the procedure significantly by the welding aid must first be glued to one of the materials to be welded.

Der Erfindung liegt die Aufgabe zugrunde, bei geringem Materialverbrauch für das Schweißhilfsmittel auf einfache Weise Schweißnähte herzustellen, die zu keiner Versteifung der verbundenen Materialien führen und das Aufbringen des Schweißhilfsmittels auf die Materialien schon vor dem Verbinden der Materialien zu ermöglichen, so daß beim Schweißvorgang selbst keine zusätzlichen Aufwendungen erforderlich sind.The invention is based on the object with low material consumption for the welding aid in a simple way to produce weld seams that do not stiffen the connected materials lead and the application of the welding aid to the materials before joining to enable the materials, so that no additional expenses during the welding process itself required are.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Schweißhilfsmittel in Pulverform auf die zu verbindenden Materialien aufgebracht wird.This object is achieved in that the welding aid in powder form on the to be joined materials is applied.

ίο Das pulverförmige Schweißhilfsmittel wird entweder ganzflächig oder nur an den zu verschweißenden Stellen aufgestreut. Vor dem Schweißen wird es durch Hitzeeinwirkung auf dem Substrat fixiert, indem der Kunststoff zum Schmelzen gebracht und wieder erstarren gelassen wird. Der Schaumstoff oder andere präparierte Materialien können sodann aufgerollt oder getafelt werden und bedürfen für das spätere Hochfrequenzschweißen keiner weiteren Präparationen oder Behandlung.ίο The powder welding aid is either sprinkled over the entire surface or only at the points to be welded. Before welding it will fixed by the action of heat on the substrate by melting the plastic and is allowed to solidify again. The foam or other prepared material can then be rolled up or paneled and do not require any further preparations for later high-frequency welding or treatment.

Durch den Pulverauftrag, der das Schweißhilfsmittel punktförmig auf dem Substrat ablagert, wird dessen Flexibilität und Atmungsaktivität nicht beeinträchtigt, was vor allem bei Polsterstoffen im Hinblick auf den Feuchtigkeitstransport von außerordentlicher Wichtigkeit ist. Dieses ist aber zweifellos der Fall, wenn das Schweißhilfsmittel in Form von Bahnen, Bändern, Filmen, Lösungen oder Dispersionen aufgebracht wird. Außerdem wird durch den punktförmigen, nichtflächigen Pulverauftrag bis zu 50 % an Schweißhilfsmittel gespart.The powder application, which deposits the welding aid in a point on the substrate, is its flexibility and breathability are not impaired, especially with regard to upholstery fabrics on the moisture transport is extremely important. But this is undoubtedly the one Case when the welding aid is in the form of sheets, tapes, films, solutions or dispersions is applied. In addition, the punctiform, non-surface powder application up to 50% saved on welding aids.

Als Schweißhilfsmittel werden vorzugsweise thermoplastische Kunststoffpulver auf der Basis von Polyvinylacetat, Polyvinylchlorid, Polyvinylpropionat, Polyvinylidenchlorid, Acrylsäureester und deren Mischpolymerisate eingesetzt. Die Pulver müssen von feiner Beschaffenheit sein und in ihrer Körnung vorzugsweise zwischen 30 und 400 Mikron liegen.The preferred welding aids are thermoplastic plastic powders based on polyvinyl acetate, Polyvinyl chloride, polyvinyl propionate, polyvinylidene chloride, acrylic acid esters and their Copolymers used. The powders must be of fine texture and preferably in their grain size be between 30 and 400 microns.

Beispiel 1example 1

Polyurethanschaum der Estertype mit einem Raumgewicht von 28 kg/m3 wird mit Hilfe eines Rüttelsiebes, einer elektromagnetischen Bestreuungsrinne oder einem anderen geeigneten Aggregat mit Polyvinylacetatpulver K-Wert 40 und einer Körnung zwischen 40 und 400 Mikron präpariert. Die Auflage beträgt 40 g/m2. Danach wird 20 bis 30 Sekunden in einer Infrarotzone geliert, anschließend abgekühlt und aufgerollt. Derartig einseitig präparierter PoIyurethanschaumstoff läßt sich unter den üblichen Bedingungen mit Pappe, Leder, Kunststoffolie, insbesondere aber Textilmaterial, ζ. Β. Autopolsterstoffen, hochfrequent verschweißen. Die Wirkung des einseitig aufgebrachten Pulvers ist derart, daß die nicht präparierte Seite gleichzeitig mit PVC-Folie verschweißt werden kann. Auf diese Weise ist eine Dreischichtenschweißung möglich.Polyurethane foam of the ester type with a density of 28 kg / m 3 is prepared using a vibrating sieve, an electromagnetic sprinkling chute or another suitable unit with polyvinyl acetate powder K value 40 and a grain size between 40 and 400 microns. The edition is 40 g / m 2 . Thereafter, gelation is carried out for 20 to 30 seconds in an infrared zone, then cooled and rolled up. Polyurethane foam prepared on one side of this kind can be covered with cardboard, leather, plastic film, but especially textile material, ζ under the usual conditions. Β. Car upholstery fabrics, high frequency welding. The effect of the powder applied on one side is such that the unprepared side can be welded with PVC film at the same time. In this way a three-layer weld is possible.

Beispiel 2Example 2

Ein Textilmaterial, beispielsweise ein Autopolsterstoff, wird unter den im Beispiel 1 angegebenen Bedingungen mit Polyvinylacetatpulver präpariert. Ein derartig behandeltes Material läßt sich mit einem nicht präparierten, normalerweise nicht schweißfähigen Polyurethanschaum ohne Schwierigkeiten unter den üblichen Bedingungen hochfrequent schweißen. Die Wirkung des präparierten Textilmaterials ist derart, daß im gleichen Schweißgang dieA textile material, for example a car upholstery fabric, is made under the conditions given in Example 1 prepared with polyvinyl acetate powder. Such a treated material can be with a Unprepared, normally not weldable polyurethane foam without difficulty high-frequency welding under normal conditions. The effect of the prepared textile material is such that the

1 47910231 4791023

freie Seite des Schaumstoffes mit einer PVC-Folie verbunden werden kann.free side of the foam can be connected with a PVC film.

Beispiel 3Example 3

Polyurethanschaum wird mit einem Mischpolymerisat aus Vinylchlorid und Vinyläther unter den im Beispiel 1 angegebenen Bedingungen präpariert. Das Pulver wird vorzugsweise mit einer Korngröße zwischen 100 und 300 Mikron angewendet.Polyurethane foam is made with a copolymer of vinyl chloride and vinyl ether under the im Example 1 prepared conditions specified. The powder is preferably with a grain size between 100 and 300 microns applied.

Ein derartig einseitig behandeltes Material läßt sich mit nicht präparierten Textilien oder anderen Materialien hochfrequent verschweißen. Im gleichen Schweißvorgang kann die nicht präparierte Seite mit einer PVC-Folie abgedeckt und verbunden werden.Such a one-sided treated material can be combined with unprepared textiles or other materials Welding at high frequencies. The unprepared side can also be welded in the same welding process covered with a PVC film and connected.

Beispiel 4Example 4

Packpapier (Natronkraftpapier) wird wie unter Beispiel 1 angegeben mit einem Mischpolymerisat aus Vinylchlorid und Vinyläther präpariert. Derartig einseitig behandeltes Papier kann dann mit Polyurethanschaum und einer auf xlie nicht präparierte Seite aufgelegten PVC-Folie verschweißt werden.Wrapping paper (soda kraft paper) is made as specified in Example 1 with a copolymer Vinyl chloride and vinyl ether prepared. Paper treated on one side in this way can then be coated with polyurethane foam and a PVC film placed on the unprepared side can be welded.

Claims (5)

Patentansprüche:Patent claims: 1. Verfahren zum Hochfrequenzschweißen von schlecht schweißbaren Kunststoffen, beispielsweise Polyurethanschaum, mit nicht thermoplastischen Stoffen, wie Hartpappe, Karton, Papier oder Textilien, durch Einbringen eines Schweißhilfsmittels aus thermoplastischem Kunststoff mit hohem dielektrischem Verlustfaktor zwischen die zu verbindenden Materialien, dadurchgekennzeichnet, daß das Schweißhilfsmittel in Pulverform auf die zu verbindenden Materialien aufgebracht wird.1. Method for high-frequency welding of poorly weldable plastics, for example Polyurethane foam with non-thermoplastic materials such as hard cardboard, cardboard, paper or textiles, by introducing a welding aid made of thermoplastic material with high dielectric loss factor between the materials to be connected, characterized that the welding aid is applied in powder form to the materials to be joined. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Pulver auf einem der zu verbindenden Materialien vor dem Schweißen plastifiziert und durch Erstarrenlassen fixiert wird.2. The method according to claim 1, characterized in that the powder on one of the to connecting materials plasticized before welding and fixed by allowing them to solidify will. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Pulver nur an den zu verschweißenden Stellen aufgebracht wird.3. The method according to claim 1 or 2, characterized in that the powder only to the Welding points is applied. 4. Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß Kunststoff-Pulver aus Polyvinylacetat, Polyvinylchlorid, Polyvinylpropionat, Polyvinylidenchlorid, Acrylsäureester und deren Mischpolymerisate aufgebracht wird.4. The method according to claims 1 to 3, characterized in that plastic powder from Polyvinyl acetate, polyvinyl chloride, polyvinyl propionate, polyvinylidene chloride, acrylic acid ester and whose copolymers are applied. 5. Verfahren nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß Kunststoffpulver mit einer Körnung zwischen 30 und 400 Mikron aufgebracht wird.5. The method according to claims 1 to 4, characterized in that plastic powder with a grain size between 30 and 400 microns is applied.
DE19631479023 1963-09-18 1963-09-18 PROCESS FOR HIGH-FREQUENCY WELDING OF POORLY WELDABLE PLASTICS Pending DE1479023B2 (en)

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DE2951347C2 (en) * 1979-12-20 1984-10-25 Katex Kaschier- und Prägeanstalt GmbH & Co KG Textilveredlung, 4054 Nettetal Process for the production of plates or webs made of plastic foam which can be welded by high frequency
GB2170445B (en) * 1985-02-01 1989-02-01 Abbeyvogue Limited Flexible sheet material suitable for shoe uppers

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