EP2506987A1 - Procédé de production d'un cordon d'adhésif thermofusible enveloppé de cire - Google Patents

Procédé de production d'un cordon d'adhésif thermofusible enveloppé de cire

Info

Publication number
EP2506987A1
EP2506987A1 EP10794918A EP10794918A EP2506987A1 EP 2506987 A1 EP2506987 A1 EP 2506987A1 EP 10794918 A EP10794918 A EP 10794918A EP 10794918 A EP10794918 A EP 10794918A EP 2506987 A1 EP2506987 A1 EP 2506987A1
Authority
EP
European Patent Office
Prior art keywords
wax
melt adhesive
hot
strand
adhesive strand
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.)
Withdrawn
Application number
EP10794918A
Other languages
German (de)
English (en)
Inventor
Rüdiger Siems
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.)
Sika Technology AG
Original Assignee
Sika Technology AG
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 Sika Technology AG filed Critical Sika Technology AG
Priority to EP10794918A priority Critical patent/EP2506987A1/fr
Publication of EP2506987A1 publication Critical patent/EP2506987A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2201/00—Polymeric substrate or laminate
    • B05D2201/02—Polymeric substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber

Definitions

  • Hot-melt adhesives have been used for a long time.
  • Hotmelt adhesives are characterized in that they are melted at an elevated temperature, typically above 100 ° C., and melted onto the substrate to be bonded.
  • the viscosity during application is very low and can be easily processed.
  • the hot melt adhesive becomes solid (amorphous and sometimes crystalline). This solidification process takes place in a very short time and is primarily responsible for the bonding.
  • the hot-melt adhesive is a so-called non-reactive hot-melt adhesive
  • the bond can be released again by heating the bond above the melting point of the hotmelt adhesive. This can be advantageous depending on the purpose or even disadvantageous. Since usually a bond due to heat influence should not be solvable, especially if the influence of heat does not occur planned, so-called reactive hotmelt adhesive were increasingly used. For these adhesives, the application is the same as for the non-reactive hot melt adhesives.
  • the adhesive is, however, by a curing reaction
  • crosslinked hotmelt adhesive in particular by means of atmospheric moisture, crosslinked, so that the crosslinked hotmelt adhesive no longer melts when exposed to heat and the adhesive bond is maintained even in heat.
  • hot-melt Glue usually a blocks, usually sealed in a plastic bag or siliconized cardboard, stored and transported.
  • the melting of such hot-melt adhesive blocks has some disadvantages. For example, the process of melting takes a very long time and on the other hand, can be due to the heat in the outer region of the
  • Block the heat acting on the block long damage the adhesive, even destroy.
  • EP 1 330 391 B1 it is proposed to pour molten hotmelt adhesive into a tube of thermoplastic material.
  • a disadvantage of this method is that there is a risk that trapped in the adhesive air bubbles or air gaps are present, which can lead to problems in a machine promotion.
  • EP 0 1 15 307 A2 finally discloses contacting a molten hotmelt adhesive with an aqueous dispersion of a polyolefin or wax.
  • this process has the great disadvantage that only microfine dispersions can be used for this purpose.
  • the preparation of such fine solid polyolefin or wax particles is very complex and are commercially poorly available, so that in practice the choice of possible shells is severely limited.
  • there is a great risk that the amount of wrapping material entering the molten adhesive can be considerable. This penetration is very difficult to control and can greatly degrade the properties of the adhesive in the adhesive bond.
  • the object of the present invention is therefore to provide a process for producing hot-melt adhesive strands coated with wax
  • the process is very easy to implement and provides an easy way to produce high quality wax coatings.
  • the present invention relates, in a first aspect, to a process for producing a hot-melt adhesive strand coated with wax.
  • This method comprises the steps:
  • hot-melt adhesive is basically any common hot-melt adhesive suitable.
  • the advantages of the present invention are particularly noticeable when the hot-melt adhesive has a sticky surface at room temperature or the tack persists for a certain time.
  • the hotmelt adhesive is a reactive hotmelt adhesive.
  • hotmelt adhesives are referred to which are reactive groups, i. Isocyanate groups and / or alkoxysilane groups and / or acyloxysilane groups, which give rise to crosslinking under the influence of water, in particular in the form of atmospheric moisture.
  • Alkoxysilane groups are understood to mean groups of the formula (Ia) and acyloxysilane groups are understood as meaning groups of the formula (Ib).
  • R 1 is an alkyl radical having 1 to 4 C atoms, in particular a methyl or ethyl group, preferably a methyl group.
  • R 2 is an alkyl radical having 1 to 6 C atoms, in particular a methyl group.
  • a stands for a value of 0 or 1, in particular for 0.
  • the reactive hotmelt adhesive is a reactive
  • Hotmelt adhesive based on polyurethanes or polyolefins.
  • the hotmelt adhesive is preferably a reactive hotmelt adhesive which contains isocyanate-containing polyurethane prepolymers.
  • the hotmelt adhesive is preferably a reactive hotmelt adhesive, which comprises polyurethane prepolymers or alkoxysilane-containing polyolefins containing alkoxysilane groups, in particular atactic poly- ⁇ -olefins containing alkoxysilane groups (APAO), preferably atactic poly- ⁇ -olefins grafted with silane (APAO).
  • APAO atactic poly- ⁇ -olefins grafted with silane
  • the hotmelt adhesive is a non-reactive hotmelt adhesive.
  • Such hot melt adhesives have no reactive groups, i. no isocyanate groups and / or
  • Hot non-stick adhesives which are used in particular, serve as a non-reactive hotmelt adhesive
  • homopolymers or copolymers of unsaturated monomers in particular from the group comprising ethylene, propylene, butylene, isobutylene, isoprene, vinyl acetate and alkyl (meth) acrylates, in particular polyethylenes (PE), polypropylenes (PP), polyisobutylenes, ethylene-vinyl acetate copolymers (EVA), styrene-isoprene-styrene copolymers (SIS), styrene-butadiene-styrene copolymers (SBS) and atactic poly- ⁇ -olefins (APAO) contain or consist essentially of it.
  • PE polyethylenes
  • PP polypropylenes
  • EVA ethylene-vinyl acetate copolymers
  • SIS styrene-isoprene-styrene copolymers
  • SBS styrene-butadiene-styren
  • the hot-melt adhesive is a non-reactive hot-melt adhesive and most preferably it is a non-reactive
  • EVA ethylene-vinyl acetate copolymers
  • SIS styrene-isoprene-styrene copolymers
  • SBS styrene-butadiene-styrene copolymers
  • APAO atactic poly- ⁇ -olefins
  • the hot-melt adhesive is not brittle at room temperature and in particular is flexible.
  • Advantageous is an elongation at break at room temperature of 0.5% to 2000%, in particular from 50% to 1000%, measured before a possible moisture curing of
  • Hotmelt adhesive according to DIN EN 53504.
  • the hot-melt adhesives typically have a melting point between 50 and 170 ° C, in particular between 80 and 160 ° C, on. Since hot-melt adhesives are polymers, the melting point in the present document is understood to mean the softening temperature, which is typically determined by the Ring & Ball method according to DIN ISO 4625.
  • the hotmelt adhesive is melted.
  • the adhesive temperature is in particular not more than 50 ° C, in particular not more than 30 ° C, above the melting point of the hotmelt adhesive.
  • conventional melting plants are used.
  • the hot-melt adhesive required for this purpose is supplied to the melting plant in the form of granules or blocks. In many cases, a barrel melter can be used for the melting, as they are known in the art.
  • Hotmelt Adhesive in step i) is defined as including also a hot melt hot melt adhesive prepared in the melt in a molten state, in other words, a freshly made
  • Melting point are cooled and then melted again, but it can be used directly as a melt.
  • the molten hotmelt adhesive is formed into a hotmelt adhesive strand.
  • This is typically done by passing a nozzle, in particular by an extrusion of the hotmelt adhesive through an extrusion opening.
  • the shape and diameter of the hotmelt adhesive strand can be significantly influenced by the shape and type of the nozzle.
  • the adhesive temperature has the melting temperature or in the range of the melting temperature, ie melting temperature ⁇ 20 ° C, in particular ⁇ 10 ° C. If the formation of the hotmelt adhesive strand takes place under pressure on the adhesive, adhesive temperatures are half the adhesive melting temperature quite possible and sometimes even preferred. Namely, it is preferable that the hotmelt adhesive strand has a certain dimensional stability.
  • This dimensional stability is also achieved by cooling the hotmelt adhesive strand to a surface temperature below the melting point of the hotmelt adhesive in step iii). This cooling can be done by air or by passing a liquid medium.
  • the cooling in step iii) is preferably carried out in a cooling bath, in particular a water bath.
  • Hot melt adhesive strand after step iii) is still flexible, in particular so flexible that it can be deflected by pulleys without breaking. It is beneficial if the surface temperature of the
  • Hot melt adhesive strand is cooled to a temperature which is not more than 100 ° C, in particular not more than 60 ° C, preferably not more than 40 ° C, below the melting temperature of the hotmelt adhesive.
  • step iv) the hot-melt adhesive strand passes through
  • Wax bath with melted wax As a wax, on the one hand, vegetable or animal waxes, such as beeswax or lanolin, and on the other hand, petrochemical waxes, such as paraffin or
  • Hydrocarbon waxes or synthetic waxes, such as polyalkylene waxes or polyethylene glycol waxes, particularly suitable.
  • waxes have a melting point of 50-90.degree. C., in particular 60-80.degree. Above the melting point, the viscosity of the wax is very low, typically below 1 Pas, preferably below 50 mPas.
  • the wax bath can be essentially entirely of molten wax.
  • the wax bath also contains water.
  • Such a water-containing wax bath is advantageous in that the temperature stability due to the large heat capacity of water can be ensured easier. Furthermore, in this case, significantly less wax can be used than would be the case in a pure wax bath. Due to the immiscibility of water and molten wax, the wax floats on the surface of the
  • Wax baths or it can be prepared using a dispersing stirrer, a wax-in-water or Wassser-in-wax emulsion.
  • the wax bath furthermore preferably contains emulsifiers and / or surfactants. It is advantageous that such wax / water emulsions are formed as homogeneously as possible. This can be supported for example by the use of stirring.
  • the wax bath can store enough wax, that for a certain period of time, at least for two to three hours, no wax must be supplied in order to replace the wax removed by the wax coating of the hot melt adhesive strand from the wax bath.
  • the wax bath may well be appropriate for the wax bath to continuously increase the respective amount of wax consumed by the wax coating
  • the temperature of the wax bath is chosen so that, although the wax is melted, it is not so high that it comes close to the melting point of the hotmelt adhesive. It is namely to prevent that the hot melt adhesive strand is changed too much in its shape by melting, or that hot melt adhesive migrate into the wax bath or dissolves in wax in large quantities. It is therefore preferable that the temperature is at most 10 ° C higher than that
  • the container of the wax bath is formed open at the top.
  • the hotmelt adhesive strand is fed to the wax bath. This can be done by feeding through a side opening. But this leads to considerable sealing problems with the wax bath. It is therefore particularly preferred if the hot-melt adhesive strand immerses the wax bath from above through an air environment into the wax bath, passes through the wax bath and leaves the wax bath again.
  • the hotmelt adhesive strand is preferably between 5 mm and
  • step v) the hot-melt adhesive strand, on whose surface wax adheres, leaves the wax bath.
  • a wax-coated hotmelt adhesive strand is formed.
  • the hotmelt adhesive strand which is surface-coated by contact with the wax, can be applied
  • a lateral outlet opening which is preferably arranged on the side of the wax bath or of the wax bath container lying opposite the inlet opening.
  • Wax bath penetrating a phase boundary wax / air leaves This embodiment is particularly for the case that in the wax bath the molten wax floats on water.
  • the layer thickness of the wax of the hot-melt adhesive strand coated with wax can be made very different and is, for example, strongly dependent on the wax bath temperature, the wax used, the hotmelt adhesive composition and the speed with which the Hot melt adhesive strand is pulled through the wax bath, depending.
  • the layer thickness of the wax of the coated with wax hot melt adhesive strand is advantageously between 1 and 100 ⁇ . If the layer thickness is much smaller, problems with the residual tackiness of the surface can occur. If the layer thickness is significantly thicker, the wax content may become too high, in particular with the preferred hot-melt adhesive strand diameters, as a result of which the mechanical and adhesive properties of the
  • Hotmelt adhesive composition may be adversely affected under circumstances.
  • step vi) the hot-melt adhesive strand is cooled.
  • Cooling takes place to a temperature below the melting point of the
  • Wax lies. This temperature is advantageously room temperature.
  • Cooling can be done by air or in particular by a cooling bath.
  • Preferred cooling bath is a temperature-controlled water bath.
  • the process is designed such that the hot-melt adhesive strand formed after step ii) passes through the individual stations of process steps iii), iv), v) and vi) without separation. This is achieved in particular by pulling the strand cooled after step vi). It has proven particularly suitable if the tensile force is exerted on the hotmelt adhesive strand by rotating a roll on which the strand is wound up.
  • step vii) follows at step vi): vii) rolling the wax-coated hotmelt adhesive strand into a roll.
  • a hot-melt adhesive strand wrapped in a roll and wrapped on a roll is ideal for storing and transporting a hotmelt adhesive strand.
  • the hot-melt adhesive strand after step v) has a substantially rectangular cross-section.
  • a transformation of the hotmelt adhesive strand can be any transformation of the hotmelt adhesive strand.
  • pulleys especially done by pulleys.
  • the pulleys can be used by acting on the hot melt adhesive strand tensile force to produce the desired cross-sectional profile. This is especially the case when the temperature of the
  • Hot melt adhesive strand is not too far below the melting point of the hot melt adhesive, i. as long as the hot-melt adhesive is still soft and consequently still plastically deformable.
  • hot-melt adhesive is a reactive hot-melt adhesive
  • water is not suitable as a constituent of the cooling bath in step iii), the wax bath in step iv) and / or the cooling bath in step vi), since the reactive
  • Hot melt adhesive would react with the water and the
  • Hotmelt adhesive would be chemically modified in an undesired manner.
  • the hot-melt adhesive strand coated with wax can also be placed in a container, for example in a barrel. It is advantageous in this case if the hot-melt adhesive strand is stored in this container in a space-saving manner, for example in the form of superimposed spiral shapes. It is also advantageous if this storage takes place in the form of the longest possible strand.
  • the hot-melt adhesive strand coated with wax can be stored without problem for a prolonged period of time, due to the hydrophobic properties of the wax coating, the hot-melt adhesive strand is particularly good and efficient against the influence of moisture, especially in the form of water
  • Protected from the influence of water are strands of reactive hotmelt adhesives, which indeed have functional groups which crosslink under the influence of water.
  • the wax-encapsulated hot-melt adhesive strand can be used easily for bonding if required found that the coated with wax hot-melt adhesive strand does not stick even after prolonged storage, for example in the form of a roll.
  • another aspect of the present invention is a package consisting of a container as a package and a wax-coated hotmelt adhesive strand prepared by a process as previously described in detail as a packaged product.
  • Another aspect of the present invention is the use of a wax-coated hotmelt adhesive strand, as previously described, for bonding substrates.
  • the hot-melt adhesive strand coated with wax must be heated to a temperature above the melting point of the hot-melt adhesive. In particular, it is not necessary for the wax coating to be removed beforehand. Due to the fact that the hotmelt adhesive strand is able to easily absorb a certain amount of wax in the molten state without greatly adversely affecting the mechanical properties and adhesive properties, the wax of the wax coating is absorbed by the adhesive without further measures. With increasing ratio of wax to hot-melt adhesive, it may be appropriate to use a mixer, for example a static mixer, to ensure the most homogeneous possible incorporation of the wax into the adhesive. The so molten Hotmelt adhesive can be applied in a manner customary for hotmelt adhesives and thus substrates are glued together.
  • the present invention also relates to a method for applying a hot-melt adhesive, in which a previously described coated with wax hot melt adhesive strand is fed directly to a melting device of a hot melt adhesive application device.
  • This feeding takes place in particular of a roll or a pack, as described above.
  • Such a method is advantageous because it is very simple and efficient.
  • hot melt adhesive can be used continuously for a long time. If the adhesive tends to run low, a new roll or package can be conveniently provided and a change seamlessly initiated.
  • no large-volume melting of the adhesive is required here, which is the problem
  • the hot-melt adhesive application devices which can be used in the context of this invention mean less space than those devices which are required for the applications of conventional hot-melt adhesives.
  • the hot-melt adhesive application device may be, for example, a hot-melt adhesive application gun or else a hot-melt adhesive application roll or hot-melt adhesive application squeegee.
  • the hot-melt adhesive application device typically also has a nozzle, doctor blade or application slot nozzle, sometimes a mixer, in particular a static mixer with attached or integrated nozzle.
  • FIG. 1 shows a schematic cross section through a plant for producing a hot-melt adhesive strand 1 covered with wax
  • Fig. 2a is a schematic cross section through a wrapped with wax
  • FIG. 2c shows a schematic partial cross section through a roll of hot-melt adhesive strand having a round cross-section surrounded by wax
  • FIG. 2d shows a schematic partial cross-section through a roll of hot-melt adhesive strand of rectangular cross-section wrapped in wax
  • FIG. 3a shows a schematic longitudinal section through a packing 7
  • 3b shows a schematic cross section through a pack 7 along the
  • FIG. 4 shows a schematic cross section through a hotmelt adhesive application device 10.
  • FIG. 1 shows a schematic cross section through an installation 1 1 for producing a hot-melt adhesive strand 1 covered with wax.
  • the hot-melt adhesive 2 is melted in step i). This takes place in a melting unit 12 suitable for the first step.
  • step ii) the molten hot-melt adhesive is formed into one Hot Melt Adhesive Strand 3.
  • a nozzle 13 is used.
  • the hot-melt adhesive is a non-reactive hot melt adhesive based on an atactic poly- ⁇ -olefin (APAO) with a melting point of 140 ° C.
  • APAO atactic poly- ⁇ -olefin
  • the hotmelt adhesive strand 3 thus formed is cooled in step iii) to a surface temperature below the melting point of the hotmelt adhesive.
  • the hot melt adhesive strand 3 leaving the nozzle 13 is fed via deflection rollers 14 to a cooling bath 15.
  • the cooling bath is a heated to 80 ° C water bath.
  • the hotmelt adhesive strand 3 After cooling of the hotmelt adhesive strand 3, it is introduced via deflection rollers 14 in a wax bath 4 with molten wax 5 and passes through this.
  • the wax bath 4 consists of water and molten wax which floats on the surface of the water; the wax here is a paraffin wax with one with a melting point of 65 ° C and the wax bath is water-heated to 70 ° C; the hot-melt adhesive strand is fed here by deflection rollers 14 the wax bath 4 from above and discharged upwards; and in each case the wax bath 4 is penetrated under the phase boundary 19 wax / air.
  • step v) the hotmelt adhesive strand, on the surface of which wax 5 adheres, leaves the wax bath 4 to form a hotmelt adhesive strand 1 covered with wax.
  • the layer thickness of the wax coating is 60 microns.
  • step vi) the hot-melt adhesive strand coated with wax is added
  • a second cooling bath 15 ' which is a water bath heated to 30 ° C., is used for this purpose; and the coated with wax hot melt adhesive strand 1 is redirected via pulleys 14 in this.
  • step vii) a roll 6 rolled up.
  • Rotational speed of the roll controlled by computer to pass through the hot melt adhesive strand which, as described above, passes through the individual stations of processes iii), iv), v) and vi) after its formation in step ii); acting force is set, that the hot melt adhesive strand 3, or the wax-coated hotmelt adhesive strand, in a desired manner, in particular with respect to a constant thickness (both strand thickness and Wachsumhüllungsdicke) and geometry produced. It must also be ensured that, above all, the hotmelt adhesive strand does not break off in step ii).
  • the winding speed depends in particular on the temperatures and materials selected throughout the process.
  • the rolled-up hot-melt adhesive strand thus wound can be stored for a long time without problems.
  • the roll can be easily transported to the place of use where the hot melt adhesive strand 1 can then be unrolled easily, in particular without gluing the roll (so-called blocking) and can be fed to a bonding station.
  • FIGS. 2a and 2b each show a schematic cross section through a hot-melt adhesive strand coated with wax.
  • FIG. 2a shows an embodiment with a round cross section
  • FIG. 2b shows an embodiment with a rectangular cross section.
  • the hotmelt adhesive strand 3 is wrapped in wax bath 4 as described in FIG. 1 with wax 5.
  • the thickness of the wax coating is advantageously between 1 and 100 ⁇ and the proportion of wax coating on the weight of the coated with wax hot-melt adhesive strand maximum 1 wt .-%.
  • the thickness of the wax envelope is not shown to scale in the embodiments shown here.
  • the rectangular strand cross-section can be formed on the one hand by a substantially rectangular nozzle 13 already in step ii).
  • the strand can, for example after step ii) first have a round cross section, which is advantageous in terms of cleaning maintenance, and can then by forming, in particular forming over deflection rollers 14, depending on the softness, or formability of the strand 3, or 1 , in steps iii), iv), v) and possibly vi).
  • the strand can be successively deflected over orthogonal to each other standing roles and acting on the strand due to the
  • FIG. 2c and 2d show a schematic partial cross section through a roll of hot-melt adhesive strand coated with wax.
  • Figure 2c is a strand of circular cross-section, as described in Fig. 2a
  • Figure 2c a strand having a rectangular cross-section, as described in Fig. 2b, shown. It turns out that a wax-coated hotmelt adhesive strand can be rolled up much more space-saving, since when rolling strands having a rectangular cross-section, there are substantially no air gaps 18.
  • FIG. 3a and 3b show another preferred type of
  • a package 7 consists of a container 8 as a package and a hot-melt adhesive strand 1 wrapped with wax as packaged goods, which was produced by a previously described method, in particular as described in FIG. In the shown here
  • the hot-melt adhesive strand 1 enveloped with wax is laid spirally into a barrel 8, as an example of a container 8.
  • the stacks of individual interconnected spirals are made so that the spirals are alternately wound "from the inside to the outside" and "from the outside to the inside", i. alternately, in the spirals, the starting point of one spiral lies in the periphery of the spiral layer, while the starting point of the next spiral lies in the middle of the spiral.
  • This type of drum filling is shown in schematic longitudinal section through a packing 7 in FIG. 3a
  • FIG. 3b shows a schematic cross section through a packing 7 along the line AA in FIG. 3a.
  • the spiral is Shape of the stratification of the hot-melt adhesive strand 1 enveloped in the wax within the barrel 8, particularly clearly visible.
  • Figure 4 shows a schematic cross section through a
  • Hot melt adhesive application device 10 This hotmelt adhesive application device 10 has a melting device 9. In the embodiment shown here, the hotmelt adhesive strand 1 coated with wax is unrolled from a roll 6 and fed directly to the melting device 9 of the hotmelt adhesive application device 10. In the embodiment shown here, the hot melt adhesive application device 10 is a hot melt adhesive application gun. From the hot-melt adhesive application device 10, the molten hot-melt adhesive is applied to a substrate 16. The application of the adhesive takes place here in the form of an adhesive bead 17. Subsequently (not shown in FIG.

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  • Adhesives Or Adhesive Processes (AREA)

Abstract

La présente invention concerne un procédé de production d'un cordon d'adhésif thermofusible enveloppé de cire. Une fois un adhésif thermofusible fondu, ce dernier est façonné sous la forme d'un cordon d'adhésif fusible, refroidi à sa température de surface au-dessous du point de fusion de l'adhésif thermofusible, étiré dans un bain de cire avec de la cire fondue et refroidi à une température inférieure au point de fusion de la cire. Ce procédé permet de produire facilement un cordon d'adhésif thermofusible enveloppé de cire, présentant une enveloppe de cire dense et de qualité constante.
EP10794918A 2009-12-04 2010-11-29 Procédé de production d'un cordon d'adhésif thermofusible enveloppé de cire Withdrawn EP2506987A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10794918A EP2506987A1 (fr) 2009-12-04 2010-11-29 Procédé de production d'un cordon d'adhésif thermofusible enveloppé de cire

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP09178093A EP2329889A1 (fr) 2009-12-04 2009-12-04 Procédé de fabrication d'un tronçon de colle à fondre chaude enveloppée avec de la cire
PCT/EP2010/068436 WO2011067213A1 (fr) 2009-12-04 2010-11-29 Procédé de production d'un cordon d'adhésif thermofusible enveloppé de cire
EP10794918A EP2506987A1 (fr) 2009-12-04 2010-11-29 Procédé de production d'un cordon d'adhésif thermofusible enveloppé de cire

Publications (1)

Publication Number Publication Date
EP2506987A1 true EP2506987A1 (fr) 2012-10-10

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EP09178093A Withdrawn EP2329889A1 (fr) 2009-12-04 2009-12-04 Procédé de fabrication d'un tronçon de colle à fondre chaude enveloppée avec de la cire
EP10794918A Withdrawn EP2506987A1 (fr) 2009-12-04 2010-11-29 Procédé de production d'un cordon d'adhésif thermofusible enveloppé de cire

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EP09178093A Withdrawn EP2329889A1 (fr) 2009-12-04 2009-12-04 Procédé de fabrication d'un tronçon de colle à fondre chaude enveloppée avec de la cire

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EP (2) EP2329889A1 (fr)
WO (1) WO2011067213A1 (fr)

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DE102018222372A1 (de) * 2018-12-19 2020-06-25 Tesa Se Verfahren zum Herstellen eines Klebstofffilaments und Klebstofffilament
DE102018222371B4 (de) * 2018-12-19 2023-10-26 Tesa Se Verfahren zum Herstellen eines Klebstofffilaments, Vorrichtung, Klebstofffilament und Verwendung

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CA1243569A (fr) * 1983-01-28 1988-10-25 Martin D. Thaler Adhesifs thermofusibles sans adherence de contact
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WO2011067213A1 (fr) 2011-06-09

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