Edge banding and production method of edge banding

Abstract

The invention relates to an edge banding strip, in particular for furniture parts, comprising a structural layer and at least one functional layer connected to the structural layer, for fixing the edge banding strip to a narrow side of a workpiece, in particular a furniture part, wherein the functional layer comprises a polypropylene homopolymer and a polyethylene homopolymer; and also relates to a method for producing an edge banding strip, in particular for furniture parts, comprising a structural layer and at least one functional layer connected to the structural layer, for fixing the edge banding strip to a narrow side of a workpiece, in particular a furniture part, wherein the functional layer comprises a polypropylene homopolymer and a polyethylene homopolymer, the method comprising a. molding, in particular extruding at least one functional layer containing a polypropylene homopolymer and a polyethylene homopolymer, b. molding, in particular extruding the structural layer, and c. connecting the functional layer to the structural layer. The invention also relates to a method for fixing the edge banding strip to a workpiece, the use of the functional layer described herein as a strip-shaped hot melt adhesive, in particular when fixing the strip edge to a workpiece, and a strip-shaped hot melt adhesive and a workpiece comprising the edge banding strip.

Description

Technical Field

[0001] The invention relates to an edge banding, in particular for a piece of furniture, comprising a structural layer and at least one functional layer for fixing the edge banding to a narrow side of a workpiece, in particular a piece of furniture. The invention also relates to a method for producing an edge banding, the use of the functional layer described herein as a hot-melt adhesive strip, a workpiece, in particular a piece of furniture, comprising an edge banding according to the invention, and a hot-melt adhesive strip. Background Art

[0002] Edge banding for covering the narrow sides of open panels, in particular front panels, worktops, counters, shelves and side panel shelving systems, is known. For example, PVC, ABS, PP or PMMA plastics can be used as edge material. Common wall thicknesses for such edge bandings are 0.4 to 3 mm. The edge banding is usually glued to the narrow side of the panel.

[0003] The edge banding is usually a thermoplastic edge banding.

[0004] The edge banding can be bonded to the board in various ways. It is known in the prior art to bond the edge banding to the board, in particular to the narrow side of the board, by hot melt adhesive. In this case, the edge banding is bonded to the narrow side of the board over the entire surface.

[0005] In order to reduce the outlay for application and the outlay for the device for applying the edge banding, it is also known in the prior art that the edge banding already includes a hot melt layer. The hot melt layer can also be referred to as a functional layer. With the hot melt layer, the edge banding can be welded to the panel, for example, by laser technology, hot air or other technologies.

[0006] Various edge bandings have been developed to control the adhesion of the edge banding to the board.

[0007] For example, DE 20 2007 011 911 U1 describes an edge banding strip comprising a hot melt layer, wherein the hot melt layer contains both polar and non-polar components in its molecular structure. An important material for the hot melt layer of DE 20 2007 011 911 U1 is a graft copolymer, in particular maleic anhydride grafted polypropylene. However, the edge banding strip of DE 20 2007 011 911 U1 is not ideal because the graft copolymers used cause high costs and the corner connections welded to the edges are usually weak. In addition, such edges can only be attached to polypropylene sheets, which are used, for example, for outdoor kitchen furniture or emergency transport equipment, with a small processing window and / or high costs.

[0008] In contrast, the hot melt layer of WO 2015 / 097163 A1 is mainly composed of a free-flowing polyolefin, wherein the free-flowing polyolefin is composed only of non-polar monomers. However, the edge banding of WO 2015 / 097163 A1 is not equally well suited for all substrates, and after fixing, the pull-off force from the particle board is significantly lower than the pull-off force from the medium density fiberboard (MDF). In addition, in WO 2015 / 097163 A1, polypropylene homopolymer can be used alone or together with polypropylene copolymer. However, polypropylene homopolymer is generally brittle, so the edge banding containing polypropylene homopolymer in the hot melt layer tends to break during the approach process when attached to the panel, generating a large amount of waste. The high breakability can also cause problems in the production process of the edge banding, especially when rolling up and cutting the produced edge banding. In addition, due to the high brittleness, it is difficult to fix the edge banding on a circular board. On the other hand, the use of polypropylene copolymer is costly. In addition, the use of polypropylene copolymer also leads to a reduction in the possibility of formula design.

[0009] DE 10 2014 109 750 A1 describes an edge strip for narrow-surface coating of plate-like workpieces, which has a base layer and a hot melt layer for fixing the edge strip to the workpiece.

[0010] DE 20 2014 106173 U1 describes an edge strip comprising a hot melt layer and a layer connected to the hot melt layer, wherein the hot melt layer contains an additive.

[0011] EP 3 114 186 B1 describes an adhesive composition comprising a base polymer comprising ethylene vinyl acetate polymer; a tackifier; an adhesion promoter having at least one semicrystalline polymer composition having an average molecular weight of 30 kg / mol or less; an antioxidant; and optionally a wax.

[0012] US 3 418 396 A describes a polyolefin composition for extrusion, coating and molding of various articles, the major part of which comprises 40 to 99 wt. % of a polypropylene having a flow rate of about 12 to 120 dg / min and about 1 to 60 wt. parts of a polyolefin having a melt flow index of about 1 to 15 dg / min and a density greater than 0.912 g / cm 3 , a mixture of polyethylenes having a melt index recovery greater than 50%.

[0013] US 2009 / 142610 A1 describes a hot-melt adhesive composition comprising at least one thermoplastic polyolefin which is solid at 25° C. and at least one amide of the formula (I) or (II). Summary of the invention

[0014] The object of the present invention is to provide an edge banding strip which can at least partially overcome the disadvantages of the prior art. In particular, the edge banding strip should have good workability and good strength after being attached to a workpiece. Further objects, features and advantages of the present invention will become clear from the following description.

[0015] This object is achieved by an edge banding strip, in particular an edge banding strip for furniture parts, which comprises a structural layer and at least one functional layer connected to the structural layer, for fixing the edge banding strip on the narrow side of a workpiece, in particular a furniture part, wherein the functional layer contains a polypropylene homopolymer and a polyethylene homopolymer, wherein the melt flow index of the polypropylene homopolymer is 150 g / 10 min or more, measured at 230° C. and a weight of 2.16 kg according to DIN EN ISO 1133-1, in particular DIN EN ISO1133-1:2021-03.

[0016] The invention also relates to a method for producing an edge banding strip, in particular for a piece of furniture, comprising a structural layer and at least one functional layer connected to the structural layer for fixing the edge banding strip to a narrow side of a workpiece, in particular a piece of furniture, wherein the functional layer comprises a polypropylene homopolymer and a polyethylene homopolymer, the method comprising

[0017] a. molding, in particular extruding, at least one functional layer comprising a polypropylene homopolymer and a polyethylene homopolymer,

[0018] b. Molding, especially extrusion, of structural layers, and

[0019] c. Connecting the functional layer to the structural layer, wherein the melt flow index of the polypropylene homopolymer is 150 g / 10 min or more, measured at 230° C. and a weight of 2.16 kg according to DIN EN ISO 1133-1, in particular DIN EN ISO 1133-1:2021-03.

[0020] The invention further relates to a method for fixing an edge banding according to the invention to a narrow side of a workpiece, in particular a piece of furniture, wherein the functional layer is activated under the action of at least one of laser radiation, microwave radiation, ultrasound, infrared radiation, plasma and hot air.

[0021] The invention also relates to the use of a functional layer as defined herein as a tape-shaped hot-melt adhesive, in particular for fastening a strip or a tape to a narrow side of a workpiece, in particular a piece of furniture.

[0022] The invention further relates to a workpiece, in particular a piece of furniture, comprising an edge strip according to the invention.

[0023] Finally, the present invention also relates to a tape-shaped hot-melt adhesive for fixing strips or tapes on the narrow sides of workpieces, in particular furniture parts, wherein the hot-melt adhesive contains a polypropylene homopolymer and a polyethylene homopolymer, wherein the melt flow index of the polypropylene homopolymer is 150 g / 10 min or more, measured at 230° C. and a weight of 2.16 kg according to DIN EN ISO 1133-1, in particular DIN EN ISO 1133-1:2021-03.

[0024] By using polypropylene homopolymers and polyethylene homopolymers in the functional layer of the edge banding according to the invention, it is easy to match the functional layer to the bonding substrate, such as particleboard or medium-density fiberboard. This allows the edge banding to establish a good bond with the corresponding substrate. In addition, the edge banding according to the invention has good flexibility, so that waste can be reduced when producing, for example, edge bandings and furniture panels. It has also been found that by using polypropylene homopolymers and polyethylene homopolymers in the functional layer, the so-called "open time", i.e. the time for attaching the edge banding to the workpiece after activation of the functional layer, can be extended, thereby simplifying the processing process, especially when bonding on curved surfaces. It has also been found that edge bandings whose functional layers contain polypropylene homopolymers and polyethylene homopolymers can achieve a larger processing window during the attachment process, especially in terms of energy input. Finally, polypropylene homopolymers and polyethylene homopolymers can be recycled very well.

[0025] Adhesives, especially hot-melt adhesives, are used to join materials. Hot-melt adhesives are solid at room temperature, melt when heated without losing mass, and solidify when cooled without shrinking significantly. Hot-melt adhesives are only plastic when molten and can therefore be processed.

[0026] The melt flow index given here is preferably determined in accordance with DIN EN ISO 1133-1:2012-03.

[0027] Polypropylene homopolymers may have different melt flow indices. The fluidity of the functional layer can be controlled by means of the melt flow index. The melt flow index of the polypropylene homopolymer is 150 g / 10 min or more, preferably 200 g / 10 min or more, measured at 230° C. and a weight of 2.16 kg according to DIN EN ISO 1133-1, in particular DIN EN ISO 1133-1:2021-03. It has been found that at a lower melt flow index, the peel strength of the edge banding after application to the board is lower. It is presumed that due to the lower melt flow index, the functional layer cannot effectively penetrate into the pore structure of the substrate, resulting in lower peel strength.

[0028] Furthermore, the polypropylene homopolymer preferably has a melt flow index of 1200 g / 10 min or less, preferably 900 g / 10 min or less, more preferably 700 g / 10 min or less, particularly preferably 500 g / 10 min or less, measured at 230° C. and a weight of 2.16 kg according to DIN EN ISO 1133-1, in particular DIN EN ISO 1133-1:2021-03. It has been found that in the case of higher melt flow indexes, the functional layer is too liquid after activation or heating for application to the board.

[0029] Suitable polypropylene homopolymers are available, for example, from Idemitsu Chemicals, Borealis AG or other polypropylene homopolymer producers.

[0030] The polyethylene homopolymer may have different melt flow indexes. According to DIN EN ISO 1133-1, in particular DIN EN ISO 1133-1:2021-03, measured at 190°C and weighing 2.16 kg, the melt flow index of the polyethylene homopolymer is preferably 200 g / 10 min or less, preferably 150 g / 10 min or less, more preferably 130 g / 10 min or less, further preferably 100 g / 10 min or less, and particularly preferably 70 g / 10 min or less. If the melt flow index of the polyethylene homopolymer is within the above range, the functional layer can be well matched to the corresponding substrate.

[0031] In addition, the melt flow index of the polyethylene homopolymer is preferably 0.1 to 300 g / 10 min, preferably 0.1 to 200 g / 10 min, more preferably 0.1 to 130 g / 10 min, further preferably 0.1 to 100 g / 10 min, and particularly preferably 0.1 to 70 g / 10 min, measured at 190° C. and a weight of 2.16 kg according to DIN EN ISO 1133-1, in particular DIN EN ISO 1133-1:2021-03.

[0032] The melt flow index of the polyethylene homopolymer can be selected in particular according to the machine used for mixing and / or according to the melt flow index of the other components. For example, the melt flow index of the polyethylene homopolymer can be, for example, 0.1 to 20 g / 10 min, in particular 0.1 to 10 g / 10 min, measured at 190° C. and a weight of 2.16 kg, according to DIN EN ISO 1133-1, in particular DIN EN ISO 1133-1:2021-03. For example, the melt flow index of the polyethylene homopolymer can also be 25 to 300 g / 10 min, in particular 30 to 130 g / 10 min, measured at 190° C. and a weight of 2.16 kg, according to DIN EN ISO 1133-1:2021-03.

[0033] Various types of polyethylene homopolymers are known to the skilled person. For example, low-density polyethylene homopolymers (PE-LD) and linear low-density polyethylene homopolymers (PE-LLD) are well known to the skilled person. In addition, metallocene polyethylene homopolymers are also well known to the skilled person. PE-LLD can in particular be a metallocene polyethylene homopolymer. Accordingly, when producing the polyethylene homopolymer in the at least one functional layer, conventional monomers for producing PE-LLD can also be used.

[0034] Different polyethylene homopolymers can be used for the functional layer according to the invention. Preferably, the polyethylene homopolymer is PE-LD, preferably PE-LLD. Furthermore, the density of the polyethylene homopolymer is preferably 0.900 g / cm 3 Up to 0.940g / cm 3 , preferably 0.910 g / cm 3 Up to 0.936g / cm 3 According to one embodiment, the polyethylene homopolymer is a metallocene polyethylene homopolymer.

[0035] The functional layer may also comprise further polyethylene homopolymers.

[0036] Suitable polyethylene homopolymers are available, for example, from LyondellBasell Corporation, Chevron Phillips Chemical Company LP, or other polyethylene homopolymer manufacturers.

[0037] By using the above-mentioned polypropylene homopolymer and polyethylene homopolymer, the fixing strength on the workpiece can be adjusted and / or improved.

[0038] Polypropylene homopolymer is preferably understood to mean an ungrafted polypropylene homopolymer, in particular an unsilane-grafted polypropylene homopolymer. Polyethylene homopolymer is preferably understood to mean an ungrafted polyethylene homopolymer, in particular an unsilane-grafted polyethylene homopolymer.

[0039] The functional layer can have different thicknesses. The thickness of the functional layer is preferably 0.05 mm to 5 mm, preferably 0.05 mm to 2 mm, more preferably 0.05 mm to 1 mm, particularly preferably 0.1 mm to 0.25 mm.

[0040] The width of the edge band is preferably 5 mm to 120 mm, preferably 5 mm to 80 mm, more preferably 5 mm to 40 mm, more preferably 5 mm to 30 mm, particularly preferably 18 mm to 28 mm.

[0041] The polypropylene homopolymer can be present in the functional layer in different contents. Based on the total mass of the functional layer, the functional layer preferably contains 40% to 99% by weight, preferably 55% to 95% by weight, more preferably 70% to 95% by weight, particularly preferably 80% to 95% by weight of the polypropylene homopolymer.

[0042] In addition, the functional layer may contain different amounts of polyethylene homopolymers. Based on the total mass of the functional layer, the functional layer preferably contains 0.1% to 40% by weight, preferably 0.1% to 30% by weight, more preferably 0.1 to 25% by weight, further preferably 1% to 20% by weight, particularly preferably 1% to 10% by weight of polyethylene homopolymers.

[0043] According to one embodiment, the functional layer may comprise at least one filler. The functional layer may comprise a natural fiber-based filler or a mineral filler. Examples of natural fiber-based fillers include wood fibers, hemp fibers, bamboo fibers, sisal fibers, rice husks or coconut fibers. Examples of mineral fillers include talc, barium sulfate, calcium carbonate, dolomite, silica, mica, kaolin, diatomaceous earth, glass, wollastonite, calcium sulfate, halloysite or zinc oxide.

[0044] The functional layer preferably contains at least one filler selected from fillers based on natural fibers, in particular wood fibers, hemp fibers, bamboo fibers, sisal fibers, rice husks or coconut fibers; mineral fillers, in particular talc, barium sulfate, calcium carbonate, dolomite, silica, mica, kaolin, diatomaceous earth, glass, wollastonite, calcium sulfate, halloysite or zinc oxide; and mixtures thereof.

[0045] It has been found that the addition of fillers to the functional layer can increase the hardness of the functional layer. The increase in hardness improves the milling behavior when milling protrusions of the edge band after the edge band has been attached to the workpiece. The increased hardness can also reduce the ingress of dirt into the functional layer during subsequent use. Furthermore, the flow behavior of the functional layer can be influenced by the addition of fillers. Finally, it has also been found that the addition of fillers to the functional layer can speed up the production of the edge band and enable the edge band to be attached to the workpiece more quickly. Without being bound by scientific theory, this seems to be due to the nucleation effect of the filler, which allows for a faster hardening of the functional layer.

[0046] The functional layer may contain different amounts of fillers. Based on the total mass of the functional layer, the functional layer preferably contains at least one filler in an amount of 1% to 40% by weight, preferably 1% to 35% by weight, more preferably 1% to 25% by weight, and particularly preferably 1% to 10% by weight.

[0047] According to one embodiment, the edge banding contains 1% to 40% by weight, preferably 1% to 35% by weight, more preferably 1% to 25% by weight, particularly preferably 1% to 10% by weight of at least one filler selected from fillers based on natural fibers, in particular wood fibers, hemp fibers, bamboo fibers, sisal fibers, rice husks or coconut fibers; mineral fillers, in particular talc, barium sulfate, calcium carbonate, dolomite, silica, mica, kaolin, diatomaceous earth, glass, wollastonite, calcium sulfate, halloysite or zinc oxide; and mixtures thereof.

[0048] Furthermore, the functional layer may contain one or more additives. The additives can be used to specifically influence the properties of the functional layer and thus the properties of the edge banding. The functional layer may contain additives selected from antioxidants, UV absorbers, hindered amine light stabilizers (HALS), pigments, dyes, anti-slip agents, anti-blocking agents, light stabilizers and mixtures thereof.

[0049] Antioxidants are available, for example, from MPI Chemie, BASF SE, Clariant AG or other manufacturers of plastic additives. Antioxidants can increase the thermal stability of the functional layer.

[0050] UV absorbers are available, for example, from MPI Chemie, BASF SE, Solvay SA or other UV absorber manufacturers. UV absorbers contribute to improving the UV stability of the functional layer.

[0051] Pigment and dyestuff can for example be obtained from BASF SE, Altana AG, Merck KGaA, Clariant AG or other pigment and dyestuff producers. Pigment and dyestuff can exist in different forms. Pigment and / or dyestuff can preferably be dissolved or dispersed in polypropylene homopolymer and / or polyethylene homopolymer. Pigment and / or dyestuff preferably dissolve or disperse in polypropylene homopolymer and / or polyethylene homopolymer.

[0052] Anti-slip agents are available, for example, from Kafrit Industries Ltd, A. Schulman Inc., Ampacet Corporation or other anti-slip agent manufacturers. Anti-slip agents help increase production speed.

[0053] Anti-blocking agents are available, for example, from Kafrit Industries Ltd, Ampacet Corporation, Croda International plc or other anti-blocking agent manufacturers.Anti-blocking agents help prevent unwanted sticking of edge banding, especially rolled edge banding.

[0054] Hindered amine light stabilizers (HALS) are available, for example, from BASF SE, Clariant AG, Azelis SA or other HALS manufacturers. HALS can increase the light stability of the functional layer. This can also slow down or reduce aging, especially embrittlement, of the functional layer in the processed state.

[0055] The functional layer may contain additives in different amounts. The total amount of additives in the functional layer is preferably 0.1% to 15% by weight, preferably 0.1% to 10% by weight, based on the total mass of the functional layer. The additives can be contained in the functional layer in particular in an amount of 0.1% to 5% by weight, preferably 0.1% to 3% by weight, based on the total mass of the functional layer. Non-pigment or dye additives can particularly preferably be contained in the functional layer in an amount of 0.1% to 1% by weight, based on the total mass of the functional layer.

[0056] The functional layer preferably contains energy-absorbing additives. The energy-absorbing additives can activate the functional layer and thus improve the fixing of the edge strip to the workpiece, in particular to a piece of furniture.

[0057] Depending on the type of energy used to fasten the edge strip to the workpiece, different energy-absorbing additives can be used. Examples of energy-absorbing additives are heat-absorbing additives, radiation-absorbing additives, such as microwave radiation-absorbing additives, and light-absorbing additives. The functional layer preferably contains light-absorbing and / or radiation-absorbing additives. The functional layer further preferably contains laser-absorbing additives. Laser-absorbing additives are particularly suitable when the edge strip is fastened by laser activation.

[0058] The content of the energy absorbing additive in the edge strip is preferably 0.1% to 5% by weight, preferably 0.1% to 3% by weight, further preferably 0.1% to 1% by weight, based on the total mass of the functional layer.

[0059] Polypropylene homopolymer, polyethylene homopolymer, fillers, additives and energy-absorbing additives may be referred to as components of the functional layer. All components of the functional layer preferably add up to 100% by weight, based on the total weight of the functional layer.

[0060] The edge banding comprises at least one functional layer. The edge banding may also comprise two or more functional layers. If the edge banding comprises two or more functional layers, these functional layers may be identical or different. The two or more functional layers may be arranged in different ways. For example, two functional layers may be arranged on top of each other so that only one functional layer is in direct contact with the workpiece. In this way, one of the functional layers may be optimized for bonding the edge banding to the workpiece, while the other functional layer may fulfill other purposes. The two functional layers may also be arranged side by side. This is advantageous, for example, for adapting the edge banding to uneven workpieces. Three or more functional layers may be arranged on top of each other, side by side or in a combination thereof. The arrangement of three functional layers side by side is very advantageous, for example, for lightweight panels or honeycomb panels. If three functional layers are used side by side, they may also have different thicknesses. For example, the middle functional layer may be thicker than the outer functional layer. The outer functional layer may also be thicker than the middle functional layer.

[0061] The edge strip may also comprise exactly one functional layer.

[0062] The structural layer of the edge banding connected to the functional layer can improve the mechanical stability of the edge banding. The structural layer can also bring a decorative effect to the edge banding.

[0063] The structural layer can be directly connected to the functional layer. The edge banding can then be produced, for example, by coextrusion. The functional layer is preferably connected to the structural layer by coextrusion. This type of connection is particularly advantageous for mass production.

[0064] The functional layer can also be applied to the structural layer in an additional step after the structural layer has been produced. This allows for a flexible design of the production process. The functional layer can be connected to the structural layer by post-coating, post-coextrusion, lamination or thermal coating.

[0065] The structural layer can also be indirectly connected to the functional layer. For example, an adhesive layer or an adhesion promoter layer can be added between the structural layer and the functional layer. Preferably, an adhesion promoter layer is arranged between the functional layer and the structural layer.

[0066] The structural layer can be made of different materials. The structural layer is preferably made of a material comprising paper, paperboard, plywood, continuous pressure laminate (CPL) or a thermoplastic material. Continuous pressure laminate is sometimes also called melamine frame edge and is available, for example, from specialist dealers.

[0067] In addition, the structural layer is preferably made of a material containing a thermoplastic material, especially a thermoplastic polymer. The thermoplastic polymer can be a thermoplastic polymer made from fossil raw materials or bio-based substances, or a thermoplastic material made from fossil raw materials and bio-based substances, such as a thermoplastic copolymer or a composite material. The thermoplastic material can preferably be extruded. The melting point of the thermoplastic material is preferably lower than 400°C. The thermoplastic polymer is preferably selected from the following group: wood plastic composites, polyethylene, polyethylene from bio-based materials, polypropylene, polypropylene from bio-based materials, polylactic acid, starch, thermoplastic starch, acrylonitrile-butadiene-styrene copolymers, acrylonitrile-styrene-acrylate copolymers, polyvinyl chloride, polymethyl methacrylate, polyethylene terephthalate, olefin-based thermoplastic elastomers, thermoplastic polyurethanes, thermoplastic copolyesters, styrene block copolymers, such as styrene-butadiene-styrene copolymers, styrene-ethylene-butylene-styrene copolymers, styrene-ethylene-propylene-styrene copolymers, styrene-ethylene-ethylene-propylene-styrene copolymers, poly(methyl methacrylate-co-butadiene-co-styrene), thermoplastic copolyamides and mixtures thereof. The above materials are usually used for the production of edge banding and are commercially available. Polymers from bio-based resources or materials refer to polymers composed of renewable raw materials, such as polyethylene made from sugar cane-based ethanol.

[0068] The method according to the invention is used to produce an edge banding strip, in particular an edge banding strip for a piece of furniture, the edge banding strip comprising a structural layer and at least one functional layer connected to the structural layer for fixing the edge banding strip to a workpiece, in particular a narrow side of a piece of furniture, wherein the functional layer contains a polypropylene homopolymer and a polyethylene homopolymer, and the method comprises the following steps

[0069] a. molding, in particular extruding, at least one functional layer comprising a polypropylene homopolymer and a polyethylene homopolymer,

[0070] b. Molding, especially extrusion, of structural layers, and

[0071] c. Connecting the functional layer to the structural layer, wherein the melt flow index of the polypropylene homopolymer is 150 g / 10 min or more, measured at 230° C. and a weight of 2.16 kg according to DIN EN ISO 1133-1, in particular DIN EN ISO 1133-1:2021-03.

[0072] The polypropylene homopolymer and the polyethylene homopolymer may be present together in a masterbatch or may be provided separately to the extruder.

[0073] The above description of the functional layer of the edge banding according to the present invention, especially the description of the polypropylene homopolymer, the polyethylene homopolymer, the thickness, the filler, the additives and the energy absorbing additive, preferably applies accordingly to the functional layer of the production method according to the present invention. The above description of the structural layer of the edge banding according to the present invention, especially the description of the materials, preferably applies accordingly to the structural layer of the production method according to the present invention.

[0074] The method according to the invention can be used in particular to produce an edge strip according to the invention.

[0075] In the production method according to the invention, the functional layer is advantageously coextruded with the structural layer. This allows a direct connection of the functional layer to the structural layer. Alternatively, in the production method according to the invention, the functional layer can also be applied to the structural layer, in particular a prefabricated structural layer. The functional layer can be connected to the structural layer in particular by post-coating, post-coextrusion, lamination or thermal coating.

[0076] According to one embodiment, the functional layer is connected to the prefabricated structural layer by post-coating, post-coextrusion, lamination or hot coating, especially in an additional step after the production of the structural layer. In this embodiment, the adhesion promoter layer can be applied to the structural layer, and then the functional layer is applied to the adhesion promoter layer on the structural layer, especially by post-coating. Likewise, in this embodiment, it is also possible to apply the adhesion promoter layer to the functional layer and then apply the structural layer to the adhesion promoter layer on the functional layer, especially by post-coating.

[0077] According to another embodiment, the structural layer and the functional layer are prefabricated. In this embodiment, the prefabricated structural layer and the prefabricated functional layer can be connected to each other by lamination. In this embodiment, an adhesion promoter layer can be applied to the structural layer and / or the functional layer.

[0078] The adhesion promoter layer can be applied to the structural layer and / or the functional layer, in particular by coextrusion, extrusion, preferably post-coextrusion or by applying a liquid containing an adhesion promoter.

[0079] When producing edge banding strips, multiple edge banding strips can be produced at the same time. In this case, a strip having a width of 10 mm to 800 mm, preferably 10 mm to 500 mm, and particularly preferably 20 mm to 420 mm is produced in the first step, and then the strip is cut into edge banding strips having the above widths.

[0080] In the method according to the invention for fixing the edge strip according to the invention to the narrow side of a workpiece, in particular a furniture part, the functional layer is activated under the action of at least one of laser radiation, microwave radiation, ultrasound, infrared radiation, plasma and hot air.

[0081] If laser radiation is used to activate the functional layer, the energy density of the laser radiation can be 5 J / cm 2 Up to 50J / cm 2 , preferably 10 J / cm 2 Up to 30J / cm 2 , preferably 15 J / cm 2 Up to 25J / cm 2 The laser power depends in particular on the color of the functional layer. Darker functional layers require lower laser powers.

[0082] If hot air is used to activate the functional layer, the temperature of the hot air is preferably between 300° C. and 650° C. The pressure of the hot air is preferably between 2 bar and 6 bar.

[0083] If a machine is used to fasten the edge strip to the narrow side of the workpiece, the feed speed of the machine is preferably 3 m / min to 80 m / min, in particular 3 m / min to 30 m / min, in particular 10 m / min to 20 m / min.

[0084] In the use according to the invention, the functional layer described above is used as a strip-shaped hot-melt adhesive, preferably for fixing a strip or a band on the narrow side of a workpiece. The workpiece can be, in particular, a furniture part or a furniture panel.

[0085] The strips which are preferably fixed to the narrow sides of the workpiece in the application according to the invention are preferably strips made of the above-mentioned structural layer materials. The strips which are preferably fixed to the narrow sides of the workpiece in the application according to the invention are preferably strips made of the above-mentioned materials for the structural layer. The above-mentioned statements about the structural layer preferably also apply to the strips and / or strips in the application according to the invention.

[0086] In the application according to the invention, the functional layer is used similarly to a double-sided adhesive tape, which is activated to produce an adhesive effect. In the application according to the invention, the tape-shaped hot melt adhesive can be composed of one or more of the above-mentioned functional layers, for example two, three or four functional layers. The tape-shaped hot melt adhesive preferably consists of exactly one of the above-mentioned functional layers. The above description of the functional layer of the edge banding according to the invention, in particular the description of the polypropylene homopolymer, the polyethylene homopolymer, the thickness, the filler, the additive and the energy absorbing additive, preferably applies accordingly to the tape-shaped hot melt adhesive in this application.

[0087] The workpiece according to the invention, in particular a piece of furniture, comprises an edge strip according to the invention. The edge strip can be attached to the workpiece by the method according to the invention for fastening an edge strip according to the invention to a narrow side of a workpiece.

[0088] The invention also relates to a tape-shaped hot-melt adhesive for fixing a strip or a tape on a narrow side of a workpiece, in particular a piece of furniture, wherein the hot-melt adhesive contains a polypropylene homopolymer and a polyethylene homopolymer, wherein the melt flow index of the polypropylene homopolymer is 150 g / 10 min or more, measured at 230° C. and a weight of 2.16 kg according to DIN EN ISO 1133-1, in particular DIN EN ISO 1133-1:2021-03.

[0089] The above description of the strips and tapes in the use according to the invention preferably also applies to the strips and tapes of the hot-melt adhesive tape according to the invention. The above description of the functional layer of the edge band according to the invention, in particular the description of the polypropylene homopolymer, the polyethylene homopolymer, the thickness, the fillers, the additives and the energy-absorbing additives, preferably also applies to the hot-melt adhesive tape according to the invention. DETAILED DESCRIPTION

[0090] Material

[0091] PPH: Polypropylene homopolymer, having a melting point (DSC) of 158°C according to ISO 11357-3 and a melt flow index of 1200 g / 10 min at 230°C and a weight of 2.16 kg according to ISO 1133-1.

[0092] PE1: Low-density polyethylene (LDPE), according to ISO 1183-1, with a melting temperature of 180 to 230 °C and a density of 0.918 g / cm 3 According to ISO 868, its Shore D hardness is 45, and according to ISO 1133-1 standard, under the conditions of 190°C and a weight of 2.16 kg, its melt flow index is 65 g / 10 min.

[0093] PE2: Metallocene linear low-density polyethylene (m-LLDPE), with a density of 0.918 g / cm according to ASTM D1505 3 , and according to ASTM D1238, under the conditions of 190° C. and a weight of 2.16 kg, its melt flow index is 1 g / 10 min.

[0094] FS black dye.

[0095] method:

[0096] An edge banding strip having a black-dyed functional layer and a structural layer with a width of 23 mm was produced by a coextrusion process. The structural layer with a thickness of 2 mm was made of acrylonitrile-butadiene-styrene. The thickness of the functional layer was 0.2 mm. The composition of the different functional layers is listed in Table 1 below.

[0097] Table 1: Produced edge strips with a structural layer made of acrylonitrile-butadiene-styrene. The contents of the functional layer components are given in % by weight

[0098]

[0099] Description of Table 1: a IHS-ingredients; b Comparative Example.

[0100] Edge bands 1 to 6 were fixed by laser activation to MDF and particleboard with a thickness of 18 mm. The edge bands together with the activated functional layer were pneumatically pressed onto the narrow sides of the MDF and particleboard using a machine pressure of 2 bar and a feed speed of 18 m / min. The laser activation was carried out with the energy density shown in Tables 2 and 3. The edge bands were attached to the panels using a HomagPROFI KAL330 / 9 / A3 / L (2013).

[0101] Tables 2 and 3 summarize the average peel strengths of edge strips 1 to 6.

[0102] In all edge bands installed on the panels, the edge bands protrude beyond the narrow sides. The protrusions are removed by machining so that the panels are connected to the edge bands without steps.

[0103] Table 2: Peel strength in N / mm of the edge banding attached to the particleboard when activating the functional layer with different energy densities.

[0104]

[0105] Description of Table 2: a - Peel strength determined according to DIN EN 1464:2010-06; b nb - not determined; c The energy density used when activating the edge banding; d Comparative Example.

[0106] Table 3: Peel strength in N / mm of edge banding attached to MDF board when activating the functional layer using different energy densities.

[0107]

[0108]

[0109] Explanation for Table 3: a - Peel strength determined according to DIN EN 1464:2010-06; b nb - not determined; c The energy density used when activating the edge banding; d Comparative Example.

[0110] As can be seen from Tables 2 and 3, the peel strength of the edge strips with a functional layer containing a polypropylene homopolymer and a polyethylene homopolymer on the particleboard panel is at least comparable or even higher, while the peel strength on the MDF board is higher, compared to the edge strips with a functional layer containing only a polypropylene homopolymer. In addition, Tables 2 and 3 show that high peel strengths can be achieved for edge strips 2 to 6 at many different energy densities for activating the functional layer. Therefore, edge strips 2 to 6 have a larger processing window when gluing the edge strips to furniture parts.

Claims

1. An edge banding strip, comprising a structural layer and at least one functional layer connected to the structural layer, for fixing the edge banding strip on a narrow side of a workpiece, characterized in that: The functional layer comprises a polypropylene homopolymer and a polyethylene homopolymer, wherein the melt flow index of the polypropylene homopolymer is 150 g / 10 min or more as measured at 230° C. and with a weight of 2.16 kg according to DIN EN ISO 1133-1:2021-03.

2. The edge banding strip according to claim 1, characterized in that: The edge banding is used for furniture pieces.

3. The edge banding strip according to claim 1, characterized in that: The edge strip comprises a structural layer and at least one functional layer connected to the structural layer and used for fixing the edge strip on the narrow side of the furniture part.

4. The edge banding strip according to claim 1, characterized in that: The melt flow index of the polypropylene homopolymer is 200 g / 10 min or more, measured at 230° C. and with a weight of 2.16 kg according to DIN EN ISO 1133-1:2021-03.

5. The edge banding strip according to claim 1, characterized in that: The melt flow index of the polypropylene homopolymer is 1200 g / 10 min or less, measured at 230° C. and with a weight of 2.16 kg according to DIN EN ISO 1133-1:2021-03.

6. The edge banding strip according to claim 5, characterized in that: The melt flow index of the polypropylene homopolymer is 900 g / 10 min or less, measured at 230° C. and with a weight of 2.16 kg according to DIN EN ISO 1133-1:2021-03.

7. The edge banding strip according to claim 5, characterized in that: The melt flow index of the polypropylene homopolymer is 700 g / 10 min or less, measured at 230° C. and with a weight of 2.16 kg according to DIN EN ISO 1133-1:2021-03.

8. The edge banding strip according to claim 5, characterized in that: The melt flow index of the polypropylene homopolymer is 500 g / 10 min or less, measured at 230° C. and with a weight of 2.16 kg according to DIN EN ISO 1133-1:2021-03.

9. The edge banding strip according to claim 1, characterized in that: The melt flow index of the polyethylene homopolymer is 200 g / 10 min or less, measured at 190° C. and with a weight of 2.16 kg in accordance with DIN EN ISO 1133-1:2021-03.

10. The edge banding strip according to claim 9, characterized in that: The melt flow index of the polyethylene homopolymer is 150 g / 10 min or less, measured at 190° C. and with a weight of 2.16 kg in accordance with DIN EN ISO 1133-1:2021-03.

11. The edge banding strip according to claim 9, characterized in that: The melt flow index of the polyethylene homopolymer is 130 g / 10 min or less, measured at 190° C. and with a weight of 2.16 kg in accordance with DIN EN ISO 1133-1:2021-03.

12. The edge banding strip according to claim 9, characterized in that: The melt flow index of the polyethylene homopolymer is 100 g / 10 min or less, measured at 190° C. and with a weight of 2.16 kg in accordance with DIN EN ISO 1133-1:2021-03.

13. The edge banding strip according to claim 9, characterized in that: The melt flow index of the polyethylene homopolymer is 70 g / 10 min or less, measured at 190° C. and with a weight of 2.16 kg in accordance with DIN EN ISO 1133-1:2021-03.

14. The edge banding strip according to claim 1, characterized in that: Polyethylene homopolymer is PE-LD, and / or has a density of 0.900 g / cm 3 Up to 0.940g / cm 3 and / or a metallocene polyethylene homopolymer.

15. The edge banding strip according to claim 14, characterized in that: Polyethylene homopolymer is PE-LLD.

16. The edge banding strip according to claim 14, characterized in that: The density of polyethylene homopolymer is 0.910g / cm 3 Up to 0.936g / cm 3 .

17. The edge banding strip according to claim 1, characterized in that: The thickness of the functional layer is 0.05 mm to 5 mm.

18. The edge banding strip according to claim 17, characterized in that: The thickness of the functional layer is 0.05 mm to 2 mm.

19. The edge banding strip according to claim 17, characterized in that: The thickness of the functional layer is 0.05 mm to 1 mm.

20. The edge banding strip according to claim 17, characterized in that: The thickness of the functional layer is 0.1 mm to 0.25 mm.

21. The edge banding strip according to claim 1, characterized in that: The functional layer contains 40% to 99% by weight of the polypropylene homopolymer, based on the total mass of the functional layer.

22. The edge banding strip according to claim 21, characterized in that: The functional layer contains 55 to 95 wt % of the polypropylene homopolymer, based on the total mass of the functional layer.

23. The edge banding strip according to claim 21, characterized in that: The functional layer contains 70 to 95 wt % of the polypropylene homopolymer, based on the total mass of the functional layer.

24. The edge banding strip according to claim 21, characterized in that: The functional layer contains 80 to 95 wt % of the polypropylene homopolymer, based on the total mass of the functional layer.

25. The edge banding strip according to claim 1, characterized in that: The functional layer contains 0.1 wt % to 40 wt % of the polyethylene homopolymer, based on the total mass of the functional layer.

26. The edge banding strip according to claim 25, characterized in that: The functional layer contains 0.1 wt % to 30 wt % of the polyethylene homopolymer, based on the total mass of the functional layer.

27. The edge banding strip according to claim 25, characterized in that: The functional layer contains 0.1 to 25 wt % of the polyethylene homopolymer, based on the total mass of the functional layer.

28. The edge banding strip according to claim 25, characterized in that: The functional layer contains 1% to 20% by weight of the polyethylene homopolymer, based on the total mass of the functional layer.

29. The edge banding strip according to claim 25, characterized in that: The functional layer contains 1% to 10% by weight of the polyethylene homopolymer, based on the total mass of the functional layer.

30. The edge banding strip according to claim 1, characterized in that: The functional layer contains at least one filler.

31. The edge banding strip according to claim 1, characterized in that: The functional layer contains at least one filler selected from the group consisting of natural fiber-based fillers; mineral fillers; and mixtures thereof.

32. The edge banding strip according to claim 31, characterized in that: The natural fiber based filler is wood fiber, hemp fiber, bamboo fiber, sisal fiber, rice husk or coconut fiber.

33. The edge banding strip according to claim 31, characterized in that: The mineral filler is talc, barium sulfate, calcium carbonate, dolomite, silicon dioxide, mica, kaolin, diatomaceous earth, glass, wollastonite, calcium sulfate, halloysite or zinc oxide.

34. The edge banding strip according to claim 31, characterized in that: The functional layer contains at least one filler selected from natural fiber-based fillers; mineral fillers; and mixtures thereof, in an amount of 1 to 40% by weight, based on the total mass of the functional layer.

35. The edge banding strip according to claim 31, characterized in that: The functional layer contains at least one filler selected from natural fiber-based fillers; mineral fillers; and mixtures thereof, in an amount of 1 to 35% by weight, based on the total mass of the functional layer.

36. The edge banding strip according to claim 31, characterized in that: The functional layer contains at least one filler selected from natural fiber-based fillers; mineral fillers; and mixtures thereof, in an amount of 1 to 25% by weight, based on the total mass of the functional layer.

37. The edge banding strip according to claim 31, characterized in that: The functional layer contains at least one filler selected from natural fiber-based fillers; mineral fillers; and mixtures thereof, in an amount of 1 to 10% by weight, based on the total mass of the functional layer.

38. The edge banding strip according to claim 1, characterized in that: The functional layer contains additives selected from antioxidants, ultraviolet absorbers, pigments, dyes, anti-slip agents, anti-blocking agents, light stabilizers and mixtures thereof.

39. The edge banding strip according to claim 38, characterized in that The UV absorber is a hindered amine light stabilizer (HALS).

40. The edge banding strip according to claim 1, characterized in that: The functional layer contains energy absorbing additives.

41. The edge banding strip according to claim 40, characterized in that: The functional layer contains light-absorbing and / or radiation-absorbing additives.

42. The edge banding strip according to claim 40, characterized in that The functional layer contains laser absorbing additives.

43. The edge banding strip according to claim 1, characterized in that: The structural layer is made of a material comprising paper, paperboard, plywood, continuous pressure laminate (CPL) or thermoplastic material.

44. The edge banding strip according to claim 43, characterized in that The structural layer is made of a material containing a thermoplastic material.

45. The edge banding strip according to claim 43, characterized in that: The structural layer is made of a material containing a thermoplastic polymer.

46. ​​The edge banding strip according to claim 43, characterized in that The structural layer is made of a material containing a thermoplastic polymer selected from the following group: wood-plastic composites, polyethylene, polyethylene from bio-based materials, polypropylene, polypropylene from bio-based materials, polylactic acid, starch, thermoplastic starch, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene-acrylate copolymer, polyvinyl chloride, polymethyl methacrylate, polyethylene terephthalate, olefin-based thermoplastic elastomer, thermoplastic polyurethane, thermoplastic copolyester, styrene block copolymer, thermoplastic copolyamide and their mixtures.

47. The edge banding strip according to claim 46, characterized in that The styrene block copolymer is a styrene-butadiene-styrene copolymer, a styrene-ethylene-butylene-styrene copolymer, a styrene-ethylene-propylene-styrene copolymer, a styrene-ethylene-ethylene-propylene-styrene copolymer or a poly(methyl methacrylate-co-butadiene-co-styrene).

48. The edge banding strip according to claim 1, characterized in that: The functional layer is connected to the structural layer by coextrusion.

49. The edge banding strip according to claim 1, characterized in that: The functional layer is connected to the structural layer by post-coating, post-coextrusion, lamination or thermal coating.

50. The edge banding strip according to claim 1, characterized in that: An adhesion promoter layer is arranged between the functional layer and the structural layer.

51. A method for producing an edge banding strip, the edge banding strip comprising a structural layer and at least one functional layer connected to the structural layer for fixing the edge banding strip on a narrow side of a workpiece, wherein the functional layer contains a polypropylene homopolymer and a polyethylene homopolymer, the method comprising the following steps a. molding at least one functional layer containing a polypropylene homopolymer and a polyethylene homopolymer, b. Molded structural layer, and c. Connect the functional layer to the structural layer, The melt flow index of the polypropylene homopolymer is 150 g / 10 min or more, measured at 230° C. and with a weight of 2.16 kg according to DIN EN ISO 1133-1:2021-03.

52. The method according to claim 51, characterized in that The method is a method for producing an edge strip for an element of furniture.

53. The method according to claim 51, characterized in that The edge strip comprises a structural layer and at least one functional layer connected to the structural layer and used for fixing the edge strip on the narrow side of the furniture part.

54. The method according to claim 51, characterized in that The method has the following steps a. extruding at least one functional layer comprising a polypropylene homopolymer and a polyethylene homopolymer, b. Extrusion of the structural layer, and c. Connect the functional layer to the structural layer, The melt flow index of the polypropylene homopolymer is 150 g / 10 min or more, measured at 230° C. and with a weight of 2.16 kg according to DIN EN ISO 1133-1:2021-03.

55. The method according to claim 51, characterized in that The functional layer is defined by at least one further feature of claims 2 to 40 and / or the structural layer is defined by at least one feature of any one of claims 41 to 46 and / or the method is a method for producing an edge strip according to any one of claims 1 to 50.

56. The method according to any one of claims 51 to 55, characterized in that The functional layer is connected to the structural layer by coextrusion, or the functional layer is connected to the structural layer by post-coating, post-coextrusion, lamination or thermal coating.

57. The method according to claim 51, characterized in that An adhesion promoter layer is arranged between the structural layer and the functional layer.

58. The method according to claim 57, characterized in that An adhesion promoter layer is applied to the structural layer and / or the functional layer.

59. The method according to claim 58, characterized in that The adhesion promoter layer is applied to the structural layer and / or the functional layer by coextrusion, extrusion or by applying a liquid containing an adhesion promoter.

60. The method of claim 58, wherein: The adhesion promoter layer is applied to the structural layer and / or the functional layer by post-coextrusion.

61. Method for fastening an edge strip according to any one of claims 1 to 50 to a narrow side of a workpiece, wherein the functional layer is activated under the action of at least one of laser radiation, microwave radiation, ultrasound, infrared radiation, plasma and hot air.

62. The method according to claim 61, characterized in that The method is a method for fixing an edge strip according to any one of claims 1 to 50 to a narrow side of a furniture component, wherein the functional layer is activated under the action of at least one of laser radiation, microwave radiation, ultrasound, infrared radiation, plasma and hot air.

63. Use of a functional layer as defined in any one of claims 1 to 40 as a hot-melt adhesive tape.

64. The use according to claim 63, characterized in that When the strip or tape is fastened to the narrow sides of the workpiece, the functional layer acts as a tape-shaped hot-melt adhesive.

65. The use according to claim 63, characterized in that When fastening the strip or tape to the narrow sides of the furniture part, the functional layer acts as a tape-shaped hot-melt adhesive.

66. The use according to claim 64 or 65, characterized in that The strip or tape is made from the material of any one of claims 43 to 46.

67. A workpiece comprising an edge banding according to any one of claims 1 to 50.

68. The workpiece according to claim 67, characterized in that The workpiece is a piece of furniture.

69. A hot melt adhesive in the form of a strip for fixing a strip or a tape on the narrow side of a workpiece, characterized in that The hot melt adhesive contains a polypropylene homopolymer and a polyethylene homopolymer, wherein the melt flow index of the polypropylene homopolymer is 150 g / 10 min or more as measured at 230° C. and with a weight of 2.16 kg according to DIN EN ISO 1133-1:2021-03.

70. The tape-shaped hot melt adhesive according to claim 69, characterized in that: The hot melt adhesive strips are used to fasten strips or tapes on the narrow sides of furniture parts.

71. The hot melt adhesive according to claim 69 or 70, characterized in that Comprising at least one feature of a functional layer according to any one of claims 2 to 40.

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