EP2377765B1 - Confection de matière adhésive - Google Patents

Confection de matière adhésive Download PDF

Info

Publication number
EP2377765B1
EP2377765B1 EP11160364.3A EP11160364A EP2377765B1 EP 2377765 B1 EP2377765 B1 EP 2377765B1 EP 11160364 A EP11160364 A EP 11160364A EP 2377765 B1 EP2377765 B1 EP 2377765B1
Authority
EP
European Patent Office
Prior art keywords
plastic film
hot melt
threads
packaged
cooling belt
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.)
Not-in-force
Application number
EP11160364.3A
Other languages
German (de)
English (en)
Other versions
EP2377765A2 (fr
EP2377765A3 (fr
Inventor
Ralf Dr. Kaldenhoff
Andreas Robens
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.)
Kaiser Steel Belt Systems GmbH
Heimbach GmbH and Co KG
Original Assignee
Kaiser Steel Belt Systems GmbH
Heimbach GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kaiser Steel Belt Systems GmbH, Heimbach GmbH and Co KG filed Critical Kaiser Steel Belt Systems GmbH
Publication of EP2377765A2 publication Critical patent/EP2377765A2/fr
Publication of EP2377765A3 publication Critical patent/EP2377765A3/fr
Application granted granted Critical
Publication of EP2377765B1 publication Critical patent/EP2377765B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
    • B65B63/08—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for heating or cooling articles or materials to facilitate packaging

Definitions

  • the present invention relates to a method for packaging hot melt adhesive, in particular pressure-sensitive hot melt adhesive or substances sticky at room temperature as a material to be packaged in a plastic film.
  • Hotmelt adhesives are solvent-free adhesives which, for use by the introduction of heat, are put into a liquid or viscous state in which they can readily wet the material surfaces to be bonded and on which they adhere firmly after cooling and solidification.
  • Hot melt adhesives usually consist of a mixture of substances, which are melted together during manufacture and then formulated.
  • PSA adhesives which stands for "Pressure Sensitive Adhesive".
  • PSA adhesives which stands for "Pressure Sensitive Adhesive”.
  • the film materials used Since it is often desired that the packaging of the portioned hot melt adhesive in use with should be melted to avoid additional operations by emptying the packaging, the film materials used must have a low melting point and also must not significantly deteriorate the adhesive properties of the hot melt adhesive.
  • film packaging from polymers with a low melting point separates due to the high melting temperatures of the hot melt adhesive, for example, 120 or 140 ° C direct filling of the hot melt adhesive in the film packaging.
  • Another method for packaging hot melt adhesive is in the DE 199 13 034 described, after which the hot melt adhesive is filled directly into a film tube, which is located during the filling process in a water bath. In this way, the outside of the film tube is sufficiently cooled to prevent immediate melting by the filled hot melt adhesive.
  • the film bag is partially squeezed together by means of transport rollers to form individual portions and welded at these points.
  • a disadvantage of this method is that the hot melt adhesive is available only in relatively large massive portions and that these portions must first be dried after removal from the water bath. Furthermore, this process can only be carried out with packaging films which have a relatively high melting point, so that they do not melt despite water cooling during filling.
  • a method of portioning hot melt adhesive is known.
  • the hot melt adhesive is first melted and then applied flat on a cooling belt, which consists of polished stainless steel, and cooled there. After the cooling process, the hotmelt adhesive is portioned by dicing.
  • the hot melt adhesive is not applied directly to the cooling belt, but portioned onto a release liner, which consists of double-sided siliconized paper. This release liner is fed to the cooling belt and removed again after the cooling process.
  • molten hot melt adhesive is metered from an adhesive reservoir by means of a feed pump via a pastillation on a cooling belt, which consists of a steel strip on which a non-adherent coating fleece is applied.
  • a cooling belt which consists of a steel strip on which a non-adherent coating fleece is applied.
  • the conveyor belt follows another workstation which, with the aid of spray heads, provides the still hot melt adhesive pastes with a closed coating fleece both on its upper side and into the lateral area, so that the hot melt adhesive pastes are covered with a coating fleece.
  • the hot-melt adhesive pastes coated in this way subsequently pass through a cooling station, in which they are cooled and thus cured.
  • the object underlying the present invention is to provide a method by which the disadvantages known from the prior art can be overcome.
  • complicated drying steps are to be avoided and the production of different dosage forms and Serving sizes for hot melt adhesive portions are made possible.
  • the hotmelt adhesive For melting the hotmelt adhesive it can be used in any desired form or the hotmelt adhesive can be mixed from its individual components, that is to say be prepared directly.
  • the preparation of the individual components can be carried out before or during the melting.
  • the melt is expediently mixed, for example, by stirring.
  • the method of the present invention can package a variety of materials, such as resins and the like, with packaging of hot melt adhesives being a preferred application.
  • the portionwise dosing can be carried out in different variants.
  • the molten material can be applied, for example, in strand form, in the form of pillows or in pasted form on the cooling belt. This can be done for example via a heated extruder, via one or more nozzles, such as in a Pastilliervorraum.
  • portionwise dosing we understand both the dosing in defined portions, for example by weight, as well as the dosing in different portions. For unitary weight portions, these can be summarized by counting to a desired package size. Portions of different weights can be combined, for example, via belt weighers to desired pack sizes.
  • the heat conducting threads are largely covered at least on the side in contact with the material to be packaged.
  • This is understood to mean that the heat conducting threads are practically completely covered by the polymer matrix and can only protrude from the polymer matrix at individual points, in particular the bending points, for example in plain weave of the textile support.
  • the coverage of the thermal conduction through the polymer matrix is in such a case on the corresponding side of the cooling belt at least 75%, in particular at least 85 to 95%, preferably 95% until complete coverage. Most preferably, a complete coverage of the thermal conduction through the polymer matrix on at least one side of the cooling belt before.
  • cooling belts can be used, which have on both sides of the above-mentioned covers the heat conduction through the polymer matrix.
  • the politiciansleitfäden the cooling belt allow rapid heat transfer to the opposite side of the cooling belt, so that cooling of the material or the hot melt adhesive through a cooling bath, such as a water bath, is not required.
  • a cooling bath such as a water bath
  • the heat dissipated therefrom can be dissipated, for example, by direct contact with a cooling medium, such as by spraying or indirectly by contact with a cooled plate or roller.
  • the heat conducting threads which are usually formed at least in part from metal threads or carbon fibers, do not come into direct contact with the material or hotmelt adhesive. This is important insofar as the hot-melt adhesive, depending on the composition of the material of the cooling threads can have such a high adhesion, that a simple removal of the adhesive portions of the cooling belt would not be possible in this case.
  • the cooling belts which can be used according to the invention can be suitably produced in such a way that initially the textile carrier is created, for example by interweaving weft and warp threads in plain weave. This textile carrier is then passed through a V-shaped slot in which is the raw material of the polymer matrix, which impregnates the textile carrier.
  • the textile carrier is then passed through a V-shaped slot in which is the raw material of the polymer matrix, which impregnates the textile carrier.
  • solutions or dispersions of the polymers of the polymer matrix in water or organic solvents are used as the raw material for the polymer matrix.
  • reactive prepolymers can be used to prepare the polymer matrix, which react after impregnation of the textile support to form the polymer matrix.
  • all reaction types are suitable for the polymerization reaction taking place in this case, in particular the radical polymerization, polyaddition or polycondensation, the latter for example with elimination of water, methanol, ethanol, acetic acid or other typical leaving groups.
  • the aforementioned substances are known to those skilled in the field of adhesives and jointing compounds.
  • the polymerization reaction can also be accelerated by irradiation with UV or IR light and / or by heat.
  • a polymer matrix according to the invention can be prepared by curing two-component silicone at elevated temperatures at about 200 ° C.
  • the removal of the material portions from the cooling belt before packaging is achieved, for example, by simply dropping it on a deflection roller.
  • the throwing off can additionally be assisted by a scraper, which does not necessarily have to touch the cooling belt surface, but can.
  • the polymer matrix of the cooling belt and the scraper should expediently consist of a material to which the material does not or hardly adheres.
  • the choice of material for the polymer matrix ultimately depends on the type of material or hot melt adhesive to be packed, so that the skilled person can determine suitable polymer matrix materials by means of simple adhesive tests. Silicone elastomers, fluoroelastomers and / or fluorosilicone elastomers are particularly preferred as the material for the polymer matrix because of their anti-adhesive properties.
  • the scraper may also be made of these materials or may consist of a metal sheet, which may be provided with these polymers or with a Teflon layer.
  • Both the cooling belt and the scraper may be subjected to corona or plasma treatment to further reduce the adhesion of the material or hot melt adhesive.
  • the heat conduction of the cooling belt at least partially made of metals or metal alloys, which are in particular selected from iron, steel, copper, aluminum, silver, brass, bronzes and the like. Also the use of carbon thermal conduction is possible. These materials give the cooling belt on the one hand sufficient mechanical strength and thus dimensional stability and on the other hand have a high thermal conductivity, with which the heat of the molten material from one side of the cooling belt can be dissipated quickly to the opposite side of the cooling belt.
  • the textile carrier of the cooling belt comprises a woven fabric in plain weave, in which the heat conducting threads at least partially form warp threads.
  • the heat conducting threads at least partially form warp threads.
  • the textile carrier has weft threads or transverse threads made of a material which is selected from coated and / or uncoated polymer, carbon and / or metal fibers, multifilaments or monofilaments.
  • a material which is selected from coated and / or uncoated polymer, carbon and / or metal fibers, multifilaments or monofilaments.
  • polymer fibers for example Fibers of nylon, aramid, kevlar, polyesters and the like in question.
  • Suitable metal fibers are, for example, iron, steel, copper, aluminum, silver, brass, bronzes or the like.
  • silicones, fluoro- and / or fluorosilicone elastomers can be used to cover the aforementioned fibers.
  • the warp or weft threads used in the context of the present invention may comprise core threads which are wound around at least one wire or a polymer fiber.
  • wires or polymer fibers may be stranded or braided around the core filaments.
  • the individual fibers of such threads may have a sheath of the above-mentioned substances. It is also possible to provide weft or warp threads of the abovementioned type after wrapping or stranding or braiding with a surface coating of the abovementioned substances.
  • cooling belt it is possible to cool the cooling belt at least in sections and / or on both sides by means of a cooling device, preferably at least on the side opposite the side coming into contact with the material or the hotmelt adhesive.
  • a cooling device for example, cooling rollers or a cooled plate come into consideration, over which the cooling belt is guided and which can be cooled by means of coolant.
  • the opposite side can also be cooled by direct contact with a cooling medium, such as by spraying.
  • a corresponding Spray device for the coolant provided. Combinations of these cooling devices are possible.
  • the material or the hotmelt adhesive is tacky at room temperature, in particular at 10 ° C. or even at 0 ° C., and the material or adhesive portions are preferably removed from the cooling belt in the adhesive state and packaged in the plastic film.
  • hot melt adhesives can be portioned and packaged with the method according to the invention, which even at temperatures below 0 ° C, such as at -5 ° C, still have pressure-sensitive adhesive properties.
  • the individual adhesive portions can partially sinter together after packaging.
  • the enlarged surface of the adhesive portions is retained, which allows a rapid melting.
  • the other hand remains in this way less air in the package or between the adhesive portions, so that a space-saving packaging is guaranteed.
  • the material to be packaged is a hotmelt adhesive containing a polymer component which is selected from polyolefins, in particular polyethylene, ethylene-vinyl acetate copolymers, polyamides, polyesters or polyester elastomers, polyurethanes, polyacrylates and / or styrene copolymers or block copolymers or mixtures thereof.
  • a polymer component which is selected from polyolefins, in particular polyethylene, ethylene-vinyl acetate copolymers, polyamides, polyesters or polyester elastomers, polyurethanes, polyacrylates and / or styrene copolymers or block copolymers or mixtures thereof.
  • the hotmelt adhesive may further comprise adjuvants selected from defoamers, wetting agents, dyes, stabilizers, plasticizers, preservatives and / or tackifying resins, in particular rosin resins and / or their derivatives.
  • the plastic film is suitable for simultaneous melting with the hotmelt adhesive.
  • the plastic film in particular contains polymers which are selected from polyethylene, polyvinyl acetate, polyamides, polybutadiene, polyesters, polycarbonates, atactic polyalphaolefins, thermoplastic polyacrylamides, polyacrylonitriles, polymethylpentenes, polyphenylene sulfides, aromatic polyurethanes, polystyrene acrylonitriles, polyethylene terephthalates and their copolymers and terpolymers, in particular ethylene vinyl acetate ,
  • the plastic film used in the context of the method according to the invention preferably has a melting temperature of 25 to 100 ° C, in particular 30 to 70 ° C, preferably 35 to 65 ° C.
  • the use of such films is particularly advantageous, since they quickly pass into the liquid form during the melting of the hot melt adhesive and thus release the hot melt adhesive packaged in the films for melting.
  • Plastic films with such low melting points can not be used in part in the processes hitherto known from the prior art be because the hot melt adhesive during the packaging still at such a high temperature that the film material would be melted thereby.
  • the plastic films used consist of at least 5 wt .-% of an ethylene-vinyl acetate copolymer, for example, more than 10 wt .-%, preferably more than 25 wt .-%, in particular 35 wt .-% or more.
  • the remaining portion is preferably formed from polyethylene.
  • Particularly suitable are mixed films of ethylene-vinyl acetate copolymer (EVA) and polyethylene (PE) having a mass ratio of ethylene-vinyl acetate to polyethylene of 5:95 to 50:50, in particular from 25:75 to 40:60, preferably from 35:65 ,
  • the content of vinyl acetate in the ethylene-vinyl acetate copolymer used is advantageously at least 30 mol%, preferably at least 40 mol%, preferably from 30 to 70 mol%, particularly preferably from 40 to 60 mol%, very particularly preferably 50 mol -%.
  • these polymers or blends of ethylene-vinyl acetate and polyethylene are characterized in particular by the fact that they do not adversely affect the adhesive properties of the hot melt adhesive generally when the film material is melted together with the hot melt adhesive and used.
  • the plastic films used in the context of the present invention are in the form of a bag or a film tube, it being possible for the individual bags to be produced by welding and separating after the packaging of the hotmelt adhesive.
  • plastic films used in the context of the present invention may in principle have any useful for the packaging of hot melt adhesives film thickness, for example, a thickness of 5 to 200 .mu.m, in particular from 10 to 100 microns.
  • neither the plastic film nor the material portions have a surface treatment with non-stick substances, such as, for example, silicone oils, surfactants and the like.
  • a surface treatment with non-stick substances such as, for example, silicone oils, surfactants and the like.
  • an adhesion-reducing surface treatment required, such as by a corona or plasma treatment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Wrappers (AREA)

Claims (15)

  1. Procédé d'empaquetage de colle thermofusible, surtout de colle thermofusible autoadhésive ou desubstancesadhésives à la température ambiante en matériaux à empaqueter dans une feuille de plastique, comprenant les étapes :
    a) Fusion du matériau à empaqueter ;
    b) Dosage par portions du matériau en fusion directement sur une bande de refroidissement et refroidissement du matériau jusqu'à son point de fusion en vue de former les portions de matériau;
    c) Enlèvement des portions de matériau de la bande de refroidissement et
    d) Empaquetage des portions de matériaux dans la feuille de plastique,
    la bande de refroidissement étant dotée d'un support textile avec fils, dont au moins une partie forme des fils thermoconducteurs grâce auxquels la chaleur peut être transférée du côté plat au côté opposé ; et le support étant encastré dans la matrice de polymère de telle façon que les fils thermoconducteurs sont recouverts le plus possible du côté qui entre en contact avec le matériau à empaqueter, la matériau fondu étant, à l'étape (b), posé directement sur le support encastré dans la matrice de polymère.
  2. Procédé selon la revendication 1, caractérisé en ce que les fils thermoconducteurs de la bande de refroidissement sont composés au moins partiellement de métaux ou d'alliages de métaux qui sont surtout sélectionnés parmi le carbone, le fer, l'acier, le cuivre, l'aluminium, l'argent, le laiton, le bronze et d'autres matériaux similaires.
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce que le support textile comprend un tissu à armure toile dans lequel les fils thermoconducteurs forment au moins partiellement des fils de chaîne.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que le support textile présente des fils de trame ou fils transversaux composés d'un matériau sélectionné parmi des fibres, multifilaments ou monofilaments de polymère, de carbone ou de métal gainés ou non.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la matrice de polymère est sélectionnée parmi le polyacrylate élastique ou des élastomères de silicone, de fluore ou de fluorosilicone.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que la bande de refroidissement est refroidie au moins par sections sur un ou deux côtés au moyen d'un dispositif de refroidissement, préférablement du côté opposé à celui qui entre en contact avec le matériau à empaqueter.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que le matériau à empaqueter est adhésif à la température de la pièce, principalement à 10 °C ou même à 0 °C, et que les portions de matériau sont préférablement retirées de la bande de refroidissement à l'état autoadhésif, puis empaquetés dans une feuille de plastique.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que le matériau à empaqueter est une colle thermofusible renfermant un composant polymère sélectionné parmi des polyoléfines, surtout du polyéthylène, des polymères, des copolymères d'éthylène-acétate de vinyle, des polyamides, polyesters ou élastomères de polyesters, polyuréthanes, polyacrylates ou copolymères de styrène ou à blocs styrène, ou leurs mélanges.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que la colle thermofusible contient des additifs sélectionnés parmi des agents antimoussants, tensioactifs, colorants, stabilisateurs, plastifiants, d'agents de conservation ou de résines collante, surtout les résines de colophane.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que la feuille de plastique se prête à la fusion simultanée avec la colle thermofusible ou qu'elle présente une température de fusion de 25 à 100 °C, surtout entre 30 et 70 °C, préférablement entre 35 et 65 °C.
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que la feuille de plastique contient des polymères sélectionnés parmi des polyéthylènes, polyacétate de vinyle, polyamides, polybutadiènes, polyesters, polycarbonates, polyalphaoléfines atactiques, polyacrylamides thermoplastiques, polyacrylonitriles, polyméthylpentènes, sulfites de polyphényles, polyuréthanes aromatiques, acrylonitriles de polystyrène, téréphtalates de polyéthylène ainsi que leurs co- et terpolymères, surtout l'éthylène-acétate de vinyle.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que la feuille de plastique est composé au moins à 5 % en poids d'un copolymère d'éthylène-acétate de vinyle, par exemple à plus de 10 % de poids, préférablement à plus de 25 % de poids, surtout à 35 % de poids ou plus.
  13. Procédé selon l'une des revendications précédentes, caractérisé en ce que la feuille de plastique est présente sous la forme d'un sac ou d'un film tubulaire et présente une épaisseur de 5 à 200 µm, plus particulièrement entre 10 et 100 µm.
  14. Procédé selon l'une des revendications précédentes, caractérisé en ce que la feuille de plastique est refermée après l'empaquetage des portions de matériau et que, facultativement, l'air en est éloigné le plus possible, aubesoin avec des vibrations simultanées.
  15. Procédé selon l'une des revendications précédentes, caractérisé en ce que la feuille de plastique ou les portions de matériau ne montrent aucune trace de traitement à l'aide de substances antiadhésives, comme de l'huile de silicone, des tensioactifs et autres substances similaires.
EP11160364.3A 2010-04-13 2011-03-30 Confection de matière adhésive Not-in-force EP2377765B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010003896A DE102010003896A1 (de) 2010-04-13 2010-04-13 Klebstoffkonfektionierung

Publications (3)

Publication Number Publication Date
EP2377765A2 EP2377765A2 (fr) 2011-10-19
EP2377765A3 EP2377765A3 (fr) 2011-11-02
EP2377765B1 true EP2377765B1 (fr) 2013-06-05

Family

ID=44009890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11160364.3A Not-in-force EP2377765B1 (fr) 2010-04-13 2011-03-30 Confection de matière adhésive

Country Status (6)

Country Link
US (1) US20110247304A1 (fr)
EP (1) EP2377765B1 (fr)
CN (1) CN102275659A (fr)
DE (1) DE102010003896A1 (fr)
TW (1) TW201206772A (fr)
ZA (1) ZA201102670B (fr)

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CN102275659A (zh) 2011-12-14
DE102010003896A1 (de) 2011-10-13
TW201206772A (en) 2012-02-16
EP2377765A2 (fr) 2011-10-19
ZA201102670B (en) 2011-12-28
EP2377765A3 (fr) 2011-11-02
US20110247304A1 (en) 2011-10-13

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