BE1017615A3 - Transfer foil, method for manufacturing panels and panel obtained herein. - Google Patents

Transfer foil, method for manufacturing panels and panel obtained herein. Download PDF

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Publication number
BE1017615A3
BE1017615A3 BE200700253A BE200700253A BE1017615A3 BE 1017615 A3 BE1017615 A3 BE 1017615A3 BE 200700253 A BE200700253 A BE 200700253A BE 200700253 A BE200700253 A BE 200700253A BE 1017615 A3 BE1017615 A3 BE 1017615A3
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BE
Belgium
Prior art keywords
adhesive
printing
separating layer
transfer film
contains
Prior art date
Application number
BE200700253A
Other languages
Dutch (nl)
Original Assignee
Flooring Ind Ltd
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 Flooring Ind Ltd filed Critical Flooring Ind Ltd
Priority to BE200700253A priority Critical patent/BE1017615A3/en
Priority to BE200700253 priority
Application granted granted Critical
Publication of BE1017615A3 publication Critical patent/BE1017615A3/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17Dry transfer
    • B44C1/1708Decalcomanias provided with a layer being specially adapted to facilitate their release from a temporary carrier
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17Dry transfer
    • B44C1/1712Decalcomanias applied under heat and pressure, e.g. provided with a heat activable adhesive
    • B44C1/172Decalcomanias provided with a layer being specially adapted to facilitate their release from a temporary carrier
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00Coverings or linings, e.g. for walls or ceilings
    • E04F13/07Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
    • E04F13/08Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00Flooring
    • E04F15/02Flooring or floor layers composed of a number of similar elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00Flooring
    • E04F15/02Flooring or floor layers composed of a number of similar elements
    • E04F15/02005Construction of joints, e.g. dividing strips
    • E04F15/02033Joints with beveled or recessed upper edges
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/62Manufacturing, calibrating, or repairing devices used in investigations covered by the preceding subgroups
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00Investigating materials by mechanical methods
    • G01N19/04Measuring adhesive force between materials, e.g. of sealing tape, of coating

Abstract

Transfer film with a print (2) that can be transferred and adhered to a substrate, said transfer film (1) comprising at least three layers of material in addition to the aforementioned print (2), including a carrier film (3) and a separating layer (4) located between the carrier film (3) and a first side (8) of the printing (2) and with which the printing (2) is arranged separably on the carrier film (3), and an adhesive layer (5) which is located on a second side (9) of the printing (2) and with which the printing (2) as aforesaid can be adhered to a substrate, characterized in that said separating layer (4) is designed as an adhesive.

Description

Transfer foil, method for manufacturing panels and panel hereby obtained.

This invention relates to a transfer film, a method for manufacturing panels, as well as to panels obtained with such a method.

In particular, the invention relates to transfer film of the type containing a print which can be transferred to a substrate and can be adhered directly or indirectly to this substrate. Transfer films of this type are known per se, for example from EP 1 208 016 and can be used to provide substrates with a print on the surface. This may involve, for example, providing decorative printing on furniture panels, floor panels, wall panels, ceiling panels and the like. Such printing may be limited to a portion of the surface of a substrate or panel such as a chamfer on an edge thereof. The coating of edges, such as bevelled edges, on a transfer film with a printing is described in WO 01/96688.

In addition to the aforementioned printing, such transfer film generally comprises at least three further material layers, including a carrier film, a separating layer and an adhesive layer. For transferring the print. or a part thereof, the transfer film is brought into contact with the part of the substrate to be coated by means of rollers or other pressure elements. The relevant part of the printing comes away from said carrier foil during transfer and adheres directly or indirectly to the substrate by means of said adhesive layer. A hot-melt adhesive is usually used for the adhesive layer, so that heat may have to be supplied for applying the printing, for example via the aforementioned pressure elements. In order to release the print from the carrier film or a part thereof, wax is used in accordance with the prior art, such as ester wax, which is located in the aforementioned separating layer. This wax causes the printing or the relevant part thereof to become detached from the carrier foil as soon as some adhesion with the panel or substrate is obtained on the basis of the adhesive layer.

With the transfer films from the prior art, quality differences in the adhesion of the printing on the substrate or the panel can occur unnoticed. Such quality differences concern, for example, a lower adhesion than desired, either of the complete applied print or of parts of this print. Such poor adhesion is difficult to detect and can lead to complaints for the end user. A factory output check of each substrate provided with printing is particularly complicated, time-consuming and expensive.

The transfer films from the prior art can also result in visible quality losses. Thus, for example, an excess of printing can be transferred, for example in that the desired transferring and adhered to the substrate peels off unwanted printing portions of the carrier foil at its edge when the carrier film comes loose. This results in an undesired burr on the edge of the desired printing, which can subsequently be removed by means of an additional sanding operation.

A further drawback established in practice of the transfer films from the prior art occurs when such transfer films are transported rolled up at a relatively high temperature, for example of more than 50 ° C. At these temperatures, the adhesive layer of the transfer film can already be partially activated and can cause an adhesion between two superimposed windings of a roll of transfer film. This adhesion manifests itself, for example, between the printing of the underlying winding and the carrier film of the upper winding. When unwinding the transfer film, the printing of the underlying winding may then also come along undesirably together with the above-mentioned winding above. It is noted that temperatures above 50 ° C and even up to 80 ° C are not excluded when goods are transported in an uncooled container and that the above-mentioned occurrence of unwanted bonds between windings can lead to a considerable loss of usable transfer film.

It is an object of the invention to provide an alternative transfer film which, according to preferred embodiments of the invention, also offers a complete or partial solution to the aforementioned disadvantages of the prior art. To this end the invention relates to a transfer film of the type containing a print which can be transferred and adhered to a substrate, said transfer film comprising at least three material layers in addition to the aforementioned print, including a carrier film, a separating layer, which is located between the carrier film and a first side of the printing and with which the printing is arranged separably on the carrier film, and an adhesive layer which is located on a second side of the printing and with which the printing as aforementioned can be directly or indirectly adhered to a substrate, characterized in that the aforementioned separating layer as an adhesive.

According to the present invention, a separating layer designed as an adhesive is used, in contrast to the prior art where conventional waxes such as ester waxes are used. Due to the fact that a separating layer designed as an adhesive is used instead of just with wax, the printing only releases from the carrier film when a relatively high adhesion of the printing or the relevant part thereof to the substrate has been achieved. If portions of the printing do not reach this higher adhesion to the substrate, the risk that these less adhesive portions are nevertheless transferred to the substrate is small, if not non-existent, since these less adhesive portions than due to the adhesive action of the release layer on the carrier film stay behind. The less adhering portions thereby automatically give rise to defects visible on the substrate, because the printing is absent there. The absence of printing on the substrate or panel, which occurs in such an event, can then be checked at the factory and / or automatically, so that an output check, for example with the aid of cameras or other sensors, becomes feasible or even simple. Such a control system can then possibly be set up in line with the application of the printing and printed products, such as panels, which do not meet the quality requirements can possibly be provided with a printing again, or removed from the line for any purpose, or be removed from the line, or marked.

The separating layer designed as an adhesive preferably provides such a large adhesion that the printing cannot be peeled off freely from said carrier foil. By "freely peelable" it is meant that it is possible to at least continuously separate the printing from the carrier film when the printing, possibly together with other layers of material of the transfer film, is taken on itself and pulled away from the carrier film. It is noted that the transfer films from the prior art do allow such peeling off, since the classical waxes used in transfer films as a separating layer, which cannot be regarded as an adhesive, do not prevent this. By "not freely peelable" is here of course meant that the printing or parts thereof cannot be continuously separated from the carrier film without at least the printing or the relevant parts thereof being positively supported, this is without being externally attached to the carrier film is supported. Such external means may consist of the support that arises when the printing has already been adhered to a substrate on the basis of the adhesive layer or of the fact that they are supported by a reinforcing layer or other material external to the transfer film. Limiting or avoiding the free peelability of the printing allows to further limit the above-mentioned risk so that the detection of the quality loss can be carried out with greater certainty.

The inability of the printing to be peeled off freely from the carrier film can be achieved, for example, by choosing the adhesive force or the adhesive capacity of the separating layer designed as an adhesive to be greater than the breaking strength of the printing.

It is clear from the foregoing that the printing can be peelable, for example when the adhesive layer provides an adhesion to a substrate, such as a panel or the like. This can be achieved, for example, in that the adhesive capacity of the aforementioned adhesive layer when transferring or releasing the printing of the carrier film is greater than the adhesive capacity of the aforesaid adhesive layer. For example, the adhesive power of said adhesive layer during transfer may be at least 10 percent greater than the adhesive power of the separating layer designed as an adhesive. In order to maintain the effect of the present invention, however, it is preferable to also use a separating layer designed as an adhesive which, when transferred, exhibits an adhesive capacity that is greater than one tenth of the adhesive capacity of said adhesive layer. For example, the adhesive power of the separating layer during transfer may be greater than half the adhesive power of the adhesive layer. It is preferable to work with a difference in adhesive power between the adhesive layer and the separating layer which is less than twenty percent of the adhesive power of said adhesive layer when transferring.

In a preferred embodiment, the separating layer designed as an adhesive preferably brings about a connection to the printing which corresponds to the following test: forming a test sample from the transfer film with a width between 3 and 10 millimeters and a length of at least 10 centimeters; forming a strip of adhesive tape with a first and a second end and a width greater than the width of said test sample; applying said strip of adhesive tape to the test sample over a portion of its length, but the full width thereof, such that said strip ends at the first end at a location between both ends of the test sample; releasing the printing with the aid of the strip of adhesive tape from the carrier foil by carefully rolling the strip from its second end of the test sample; and checking, as a result of the test, whether or not the print is peeled off further from the carrier film at the aforementioned first end of the strip; the use of the aforementioned result as a criterion as to whether the test sample meets the test, whereby, if the printing is peeled off further from the carrier film, such test sample does not meet the test, which therefore normally means that in the event that it is not possible is to further peel the print from the carrier film, such a test sample does satisfy the test.

The separating layer designed as an adhesive preferably produces a connection with the printing which corresponds to the aforementioned test when it is carried out in its entirety at room temperature. By "careful rolling" is meant any method by which kinks in the printing are prevented as well as avoiding jerking of the printing. For example, the peeling can be performed by winding the strip of adhesive tape from its second end of the test sample onto a roll, this roll then preferably having a diameter of three centimeters or more. In order to avoid jerking, unrolling preferably takes place at a speed that is smaller than 3 centimeters per second and more preferably smaller than 1 centimeter per second. The preferred embodiment described above gives rise to a connection which offers a good guarantee of the occurrence of the burrs mentioned in the introduction and which can practically minimize the above-mentioned risk. Moreover, the test described here allows a simple way to test the quality of the transfer film. Such a test can be applied randomly as an entry check. Preferably, all test samples from a transfer film meet the test described above.

The separating layer designed as an adhesive preferably contains at least one adhesive, and more preferably at least one permanent adhesive, which preferably retains its adhesive capacity at least in a temperature range between 23 ° C and 200 ° C. Better still, the adhesiveness of such permanent adhesive remains acceptable at least up to 250 ° C or 300 ° C.

The separating layer designed as an adhesive may have at least one or a combination of two or more of the following properties: the separating layer contains an adhesive with one or more components of the aforementioned adhesive layer; the separating layer contains an adhesive with the same components as said adhesive layer; the separating layer is free of wax or at least consists of less than 50 percent wax; the separating layer contains a mixture of wax and adhesive and / or contains a modified wax that provides a particularly adhesive effect; the separation layer contains polyurethane; the separating layer contains a rubber-based adhesive; the separating layer contains a thermoplastic; the separating layer contains a hot melt adhesive; the separating layer contains an acrylic or methacrylic acid ester; the separating layer contains an acrylate dispersion adhesive the separating layer contains a methacrylate resin or a methacrylate copolymer.

The advantages of the transfer film described above can be achieved on the basis of these substances. A practical example of a suitable substance can be found in the adhesive that is on everyday office tape. The transfer film of the invention could therefore also be manufactured by using such office tape as a carrier film and separating layer, and by providing it on the side carrying the adhesive with a printing and an adhesive layer. The inventor has been able to determine through experiments that the disadvantages of the prior art in the use of such experimental transfer film disappear completely or partially.

It is clear that the transfer film according to the invention can also be realized in other ways. Thus, for example, use can be made of the same structure, materials and production processes as with the known transfer films, with the only difference that now instead of the material that was previously used for the separating layer, a material is used which corresponds to the invention.

The transfer film of the invention can take any form. For example, it can be designed as sheets, webs, tapes or the like, the design as tapes being the most suitable for use when covering the edges of panels, more particularly floor panels, as described in the aforementioned WO 01/96688. . Such belts preferably have a width of 3 to 15 millimeters, and more preferably of 5 to 10 millimeters, and are preferably transported rolled up.

The invention also relates to a method for manufacturing panels of the type comprising a one-part or multi-part core and a coating applied to this core, characterized in that a transfer film having the characteristics is provided for realizing at least a part of the coating of the invention, wherein at least a portion of the printing of the transfer film is applied or transferred directly or indirectly to the aforementioned core. From the foregoing, it is clear that such a method can have many advantages over a method of the prior art. For example, such a method permits a simpler and less costly quality check. Furthermore, it is clear that the invention also relates to a panel obtained with such a method. This may, for example, concern a furniture panel, a wall panel or a ceiling panel.

The panels of the invention preferably relate to panels, the aforementioned covering of which is mainly designed as a laminate top layer, but wherein also a part of the covering is obtained by transfer printing.

It is noted that pressing operations can be used for the manufacture of panels with a laminate top layer or laminate panels. For this, essentially two possible manufacturing methods can be used. According to a first possibility, laminate panels can be manufactured by means of a so-called DPL process (direct pressure laminate), wherein one or more resin-provided material sheets, for example paper sheets, are introduced into a press together with a core, for example a wood-based core. where they are exposed to an increased pressure and temperature on the basis of a pressing element and are thus interconnected to form a coated core material, which can then be processed into any coated panel. According to a second possibility, the laminate panels can be manufactured on the basis of a so-called HPL process (high pressure laminate), in which a plurality of resin-supplied material sheets are first consolidated before they are applied to a core, for example before they are glued to the core.

For laminate panels, the transfer of the printing or the relevant part thereof on the basis of the transfer printing process preferably takes place after the aforementioned pressing operations have been carried out. Intermediate operations such as dividing larger sheets into smaller panels and performing profiling operations at the edges of the panels obtained are of course not excluded. Such profiling operations may involve forming one or more chamfer, for example by removing a portion of material from the laminate top layer and optionally the core at one or more upper edges. Functional parts can also be provided on the basis of the profiling operations, such as coupling parts with which two panels, such as floor panels, can be connected to each other.

The method of the invention is preferably used for the manufacture of panels which have a chamfer on at least one of their edges and more preferably on at least two opposite edges, wherein at least this chamfer is provided with a covering and wherein said covering is then at least partially by means of the aforementioned transfer foil.

When transferring the relevant part of the printing to the panel, a temperature is preferably applied that is higher than 23 ° C, and more preferably higher than 50 ° C, and preferably a pressure of between 1 and 15 N per square millimeter is applied. . It is clear that one or more layers of material may be present between the core of the panel and the printing applied. These may, for example, form a base layer which may or may not have a coloring and / or leveling effect. It is not excluded that the printing is applied above a laminate top layer.

It is noted that, when the portion of the printing to be transferred is released from the carrier film, the aforesaid separating layer designed as an adhesive preferably remains on said carrier film. However, it is not excluded that it may be transferred entirely or partially to the panel with the printing.

With the insight to better demonstrate the characteristics of the invention, a few preferred embodiments are described below as an example without any limiting character, with reference to the accompanying drawings, in which: figure 1 shows a transfer film according to the invention; Figure 2 represents a transfer film from the prior art; figures 3 to 6 show different steps in a method for testing transfer films; figures 7 and 8 on a larger scale in a view of the area indicated with F7 in figure 6 represent two possible results of the test method of figures 3 to 6; Figure 9 represents a floor panel according to the invention; figure 10 represents a cross-section according to the line X-X indicated in figure 9; Figure 11 shows on a larger scale a view of the area indicated by F11 on Figure 10; Figure 12 illustrates a method for manufacturing panels in a section along the line XII-XII indicated in Figure 11.

Figure 1 shows a transfer film 1 with the features of the invention. For this purpose, the transfer film 1 comprises, in addition to a transferable print 2, essentially three layers of material 3-4-5. In connection with the printing 2, it is noted that it can be realized with the aid of any printing process, for example laser printing, ink jet printing or offset printing can be applied. It is further noted that such printing 2 can be carried out both in a uniform color and in the form of a motif.

A first material layer relates to a carrier film 3 which forms the basic structure of the transfer film 1. This may, for example, consist of a paper foil with a weight of between 20 and 150 grams per square meter, or may consist of a plastic foil such as a PVC, PET or polyester foil. The thickness of the carrier film 3 is preferably between 10 and 100 micrometers, for example approximately 20 micrometers. It is of course also possible to appeal to composite carrier films which, for example, consist of a paper layer on the underside 6, but consist of a plastic film on the upper side 7.

Above the aforementioned carrier film 3, a separating layer 4 is provided as the second of the aforementioned material layers, with which the aforementioned printing 2 is arranged separably on the carrier film 3. Thus, the separating layer 4 is located between the carrier film 3 and a first side 8 of the printing 2. The thickness of the separating layer 4 is preferably smaller than 1 micron and may be between 0.01 and 0.2 micron.

A third layer of material is located above the printing 2, this is on a second side 9 of this printing 2, an adhesive layer 5 with which the printing 2 or parts thereof may or may not be adhered directly to a substrate. The adhesive layer 5 may, for example, contain a permanent acrylic dispersion adhesive or an adhesive which must be activated by heat, such as a hot-melt adhesive, for example based on polyurethane. Such an adhesive layer preferably has a thickness between 2 and 10 micrometers and more preferably between 3 and 6 micrometers.

It is noted that the transfer oil 1 may contain, in addition to the aforementioned printing 2, the carrier film 3, the separating layer 4 and the adhesive layer 5, possibly further, layers of material, which may or may not be intermediate, but that these are not here for simplicity. are shown. In principle, all layers can be used that are used in the transfer films from the prior art. For example, a lacquer layer can be applied between the separating layer 4 and the printing 2, which is then preferably transferred to the substrate together with the printing 2 and provides the final printed product with a protection. Such a lacquer layer preferably has a thickness between 0.5 and 5 micrometers and more preferably between 1 and 2 micrometers. For further examples, reference is made to the aforementioned EP 1 208 016.

The special feature of the transfer films 1 of the present invention is situated in the above-mentioned separating layer 4, which according to the invention is designed as an adhesive, for which purpose the substances mentioned in the introduction can be used, among other things. This is in contrast to the state of the art where such a separating layer is not designed as an adhesive but, for example, is essentially designed as a wax.

In a preferred embodiment of the invention, the separating layer 4 provides such an adhesion with the printing 2 that it cannot be freely peeled off from the aforementioned carrier film 3. For clarification, Figure 2 shows a transfer film 1 which does not meet the characteristics of the relevant preferred carrier. embodiment and in which therefore the printing 2 is freely peelable. Figure 2 clearly shows that in such a case it is possible to take on the printing 2 and to continuously separate, peel or strip it at least from the carrier film 3. By "take on itself" it is meant that the printing 2 at the place of separation is not supported by means external to the transfer foil 1. This can be done, for example, by at least taking hold of the print 2 by hand and carefully pulling it away from the carrier foil 3 as indicated by the arrow 11, without the print 2 being torn.

When performing the peel test of Fig. 2, the carrier film 3 is preferably also held at an end 12 from which the printing 2 has already been removed, so that a smooth subtraction movement can arise, for example, because the transfer film 1 at the place 10 where the separation takes place somewhat upwards coming.

Optionally, aids can also be used to start peeling. For example, as shown in axis line 13, an external means such as an adhesive tape can be adhered to the transfer film 1 which can then be grasped to start the separation of the printing 2. Of course, the power or inability to be peeled off freely must be determined in a zone 14 where such external means do not support the printing 2.

According to another preferred embodiment, the separating layer 4 designed as an adhesive produces a connection with the printing 2 which corresponds to a test described in the introduction. Figure 3 illustrates the preparatory steps of this test method. Here, on the one hand, a test sample 15 is formed from a transfer foil 1 with a width B1 between 3 and 10 millimeters and a length L1 of at least 10 centimeters and, on the other hand, a strip of adhesive tape 16 is formed with a first end 17 and a second end 18 and a width B2 greater than the width of the aforementioned test sample. As a final step in the preparation, the aforementioned strip of adhesive tape 16 is applied or pressed onto the aforementioned test sample 15 over a part of its length L1, such that this strip 16 ends at the first end 17 at a location between both ends 12-19 of the test sample. It is noted that the adhesive of the strip of adhesive tape 16 is shown in solid black line.

Figure 4 shows the initial test situation obtained in cross-section. As shown, it can be ensured that the aforementioned strip of adhesive tape 16 does not adhere to the transfer foil 1 at its second end 18, so that this second end 18 can be easily grasped and can be moved in the direction of the arrow 20 in further steps of carrying out the test. . Before carrying out the test, care must be taken that the adhesion of the strip of adhesive tape 16 to the transfer foil 1 is at least so great that the print 2 peels off when the aforementioned strip of adhesive tape 16 is pulled back, at least in the zone 21 where it passes through this adhesive tape 16 is supported. For this purpose, it is advisable to properly tighten the strip of adhesive tape 16 before starting the peeling thereof.

Figure 5 shows a next step in the test in which the printing 2 is peeled from the carrier foil 3 by means of the strip of adhesive tape 16 by carefully unrolling the strip 16 from its second end 18 of the test sample 15. This rolling can, as shown here, be carried out on the basis of an aid such as a spool 22, whereby a suitable choice of the aid can prevent the printing 2 from being torn and / or the printing 2 from being kinked. For a coil, it is necessary to choose the diameter D1 sufficiently large. A coil diameter D1 of at least three centimeters is sufficient for most applications. It is clear that careful rolling can also be achieved without the use of tools. If care is taken that the printing 2 is not pulled and that the printing 2 is not kinked, unrolling can also be carried out manually. It is clear that the term "unrolling" in the context of the present invention does not indicate a strict unrolling movement, but merely refers to peeling off the printing sheet 2 without kinking and tearing, which is preferably done by printing. 2 to form an arc 23 at the location of the separation 10, just as shown in FIG.

Figure 5 furthermore shows that with reference to the arrow 24. the transfer film 1 or its test sample 15 is preferably retained at least at one end 12 during unrolling. It is further noted that to prevent the aforementioned jerks, a peeling or unrolling speed V is preferably used which is smaller than 3 centimeters per second, and more preferably smaller than 1 centimeter per second.

Figure 6 shows the situation of the test in which the printing 2 has already been peeled off to the first end 17 of the strip of adhesive tape 16. As a result of the test, it must then be checked whether or not the printing 2 at this end 17 continues is peeled off from the carrier foil 3 when unrolling past this end 17.

Figure 7 shows the result when such further peeling is not possible and a fracture 25 of the printing is determined at the aforementioned first end of the strip of adhesive tape 16. Such a fracture indicates that such test sample 15 then meets the test set forth above .

Figure 8 shows the result in case the print 2 can be peeled further from the carrier film 3 and such test sample does not therefore satisfy the test.

Figure 9 is a top view of a panel 26, in this case a floor panel, which has been obtained on the basis of a method according to the present invention.

Figure 10 clearly shows that in this case it concerns a floor panel of the type comprising a core 27 and a laminate top layer 28 applied to this core. The top layer 28 is in this case composed of two layers, namely a decorative layer 29 which can have a printing or coloring and a so-called overlay 30 which covers the decorative layer 29. Such a top layer 28 can for instance be formed on the panel 26 on the basis of the DPL technique mentioned in the introduction. Furthermore, the floor panel 26 shown is provided on at least two opposite edges 31-32 with coupling means 33 with which two of such floor panels 26 can be coupled to each other and can be connected to each other both in a horizontal direction H1 and in a vertical direction VI for forming of a floor covering. Such coupling means can also be provided on all edges, as shown in Figure 9.

The floor panel 26 of Figure 10 furthermore has edges 34 on at least two opposite edges 31-32, in this case with the shape of a bevelled edge. These chamfers 34 are realized by removing the top layer 28 at the relevant edges 31-32 and in this case also a part of the core 27, for example on the basis of a mechanical operation with a cutting tool, such as on the basis of a milling process . It is clear that such chamfers 34 can also be formed in other ways, for example on the basis of impressions.

Figure 11 clearly shows that the aforementioned chamfers 34 are provided with a covering 35 which is applied separately from the aforementioned top layer 28. In this case this covering 35 relates to a printing 2 which has been realized on the basis of a transfer printing process. For this purpose, as Figure 12 shows, a transfer film 1 was supplied, for example from a roll 36, and pressed against the surface 37 of the bevel 34 to be printed. For the sake of simplicity, only two layers of the transfer foil 2 are shown, namely the carrier foil 3 and the printing 2.

In the example of Fig. 12, for transferring the printing 2 to the chamfer 34, use is made, for example, of the equipment 38 known from DE 103 52 700. The equipment 38 shown comprises a metal conveyor belt 39 which is heated by means of heating units 40 and if an endless belt is applied to the surface 37 to be coated via the transfer film 1 via the transfer film 1. In this way, heat is applied to the transfer film 1 with the intention of activating the adhesive layer 5, not shown here, which contacts the surface 37 to be coated. At the same time, the conveyor belt 39 is pressed against the surface 37 to be coated by means of pressure rollers 42 or other pressure elements via the transfer foil 1. In this case, pressures between 1 and 15 N per square millimeter are preferably achieved. The temperature can be higher than 200 ° C, but preferably remains below 300 ° C.

It is clear that the floor panel 26 is preferably moved beyond the aforementioned equipment 38 and that the cooperation between the surface 37 to be coated and the aforementioned equipment 38, in particular the aforementioned conveyor belt 39, determines the supply of the transfer film 1.

When the transfer film 1 leaves the conveyor belt 39, it is preferably cooled over a specific zone 43, for example on the basis of cooling rollers 44, before the printing 2 is separated from the carrier film 3. In the case of heat-activatable adhesive layers 5, cooling is desirable in order to increase the adhesion of the adhesive layer 5 during separation and to keep the throughput speed W at which the panel 26 is moved past the equipment 38 high.

It is noted that the printing at the separating site 10 is supported by the panel 26 so that separating presents few problems even when working with transfer foils that are not freely peelable or that meet the test described in Figs. 3 to 7. Working with this type of transfer film is even preferable in the method of the invention. As stated above, poor adhesion of such a transfer film 1 results with a high degree of certainty in a visible defect, so that an inspection of the applied printing 2 can be carried out in a simple manner immediately after the separation or at least in line with the separation. This is shown schematically in Figure 12 with the sensor 45.

It is noted that the printing 2 is applied at a throughput speed W of at least 50 meters per minute or even up to 100 meters per minute. It is further noted that for this purpose also other equipment 38 can be used than that which is schematically shown in Figure 12 and that it is not necessary to work with a heat-activated adhesive layer 5.

It is further to be noted that the thicknesses of the respective layers shown in the figures are purely schematic and that these layers may, on the one hand, differ considerably in thickness and, on the other hand, may exhibit a considerably smaller thickness with regard to the length of such foil than shown here.

It goes without saying that still other special properties can be integrated into the transfer film according to the invention, such as, for example, the use of a printing which, in the transferred state, produces a relief on the printed surface, wherein this relief may or may not be in register with an optional motif present in the print.

The present invention is by no means limited to the embodiments described above, but such transfer foils, methods and panels can be realized according to different variants without departing from the scope of the present invention.

Claims (11)

  1. A transfer film of the type containing a print (2) that can be transferred and bonded to a substrate, said transfer film (1) comprising at least three layers of material in addition to said print (2), including a carrier film (3), a separating layer ( 4), which is located between the carrier film (4) and a first side (8) of the printing (2) and with which the printing (2) is arranged separably on the carrier film (3), and an adhesive layer (5) which is is located on a second side (9) of the printing (2) and with which the printing (2) as aforesaid can be adhered to a substrate, thereby. characterized in that said separating layer (4) is in the form of an adhesive.
  2. Transfer film according to claim 1, characterized in that the separating layer (4) designed as an adhesive provides such a high adhesion that the printing (2) cannot be peeled off freely from said carrier film (3).
  3. Transfer film according to claim 1 or 2, characterized in that the separating layer (4) designed as an adhesive produces a connection with the printing (2) corresponding to the following test: forming a test sample (15) from the transfer film (1) with a width (B1) between 3 and 10 millimeters and a length (L1) of at least 10 centimeters; forming a strip of adhesive tape (16) with a first end (17) and a second end (18) and a width (B2) greater than the width (B1) of said test sample (15); applying said strip of adhesive tape (16) to the test sample (15) over a portion of its length (L1) but across its entire width (B1) such that said strip (16) terminates at the first end (17) at a location between both ends (12-19) of the test sample (15); peeling the print (2) from the carrier film (2) by means of the strip of adhesive tape (16) by unrolling the strip (16) from its second end (18) of the test sample (15) at a speed ( V) that is less than 1 centimeter per second; and checking, as a result of the test, whether at the aforementioned first end (17) of the strip (16) the printing (2) is peeled further away from the carrier film (3) or not; using said result as a criterion as to whether the test sample (15) satisfies the test, wherein, if the print (2) is peeled further from the carrier film (3), such test sample (15) does not meet the test.
  4. Transfer film according to claim 3, characterized in that the separating layer (4) designed as an adhesive produces a connection with the printing (2) corresponding to said test when it is carried out in its entirety at room temperature.
  5. Transfer film according to one of the preceding claims, characterized in that the separating layer (4) designed as an adhesive contains at least permanent adhesive, which preferably retains its adhesive capacity at least in a temperature range between 23 ° C and 200 ° C.
  6. Transfer film according to one of the preceding claims, characterized in that the separating layer (4) designed as an adhesive has at least one or a combination of two or more of the following properties: the separating layer (4) contains an adhesive with one or more components of the aforementioned components adhesive layer (5); the separation layer (4) contains an adhesive with the same constituents as said adhesive layer (5); the separating layer (4) is free of wax or at least still consists of less than 50 percent wax; the separating layer (4) contains a mixture of wax and adhesive; the separating layer (4) contains polyurethane; the separating layer (4) contains a rubber-based adhesive; the separating layer (4) contains a thermoplastic; the separating layer (4) contains a hot melt adhesive; the separating layer (4) contains an acrylic or methacrylic acid ester; the separating layer (4) contains an acrylate dispersion adhesive the separating layer (4) contains a methacrylate resin or a methacrylate copolymer.
  7. Transfer film according to one of the preceding claims, characterized in that it is designed as a belt and in particular as a belt of the type for covering chamfers to panels, more particularly floor panels.
  8. Method for manufacturing panels of the type comprising a one-part or multi-part core (27) and a coating applied to this core (27), characterized in that a transfer film (1) is provided for realizing at least a part of the coating ) is used with the features of any of the preceding claims.
  9. Method according to claim 8, characterized in that the side is used to produce panels which have a bevel (34) on at least one of their edges (31-32) and even better on at least two opposite edges (31-32) wherein at least this chamfer (34) is provided with a coating (35) and wherein said coating (35) is realized at least partially by means of the aforementioned transfer foil (1).
  10. 10. Panel, characterized in that it is obtained with a method according to claim 8 or 9.
  11. Panel according to claim 10, characterized in that it is a floor panel (26), a furniture panel, a wall panel or a ceiling panel that has been obtained at least on the basis of a DPL technique.
BE200700253A 2007-05-23 2007-05-23 Transfer foil, method for manufacturing panels and panel obtained herein. BE1017615A3 (en)

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BE200700253A BE1017615A3 (en) 2007-05-23 2007-05-23 Transfer foil, method for manufacturing panels and panel obtained herein.
BE200700253 2007-05-23

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE200700253A BE1017615A3 (en) 2007-05-23 2007-05-23 Transfer foil, method for manufacturing panels and panel obtained herein.
PCT/IB2008/001267 WO2008142538A2 (en) 2007-05-23 2008-05-21 Transfer foil, method for manufacturing panels and panel obtained herewith

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7886497B2 (en) 2003-12-02 2011-02-15 Valinge Innovation Ab Floorboard, system and method for forming a flooring, and a flooring formed thereof
US8365499B2 (en) 2009-09-04 2013-02-05 Valinge Innovation Ab Resilient floor
JP6105587B2 (en) 2011-08-29 2017-04-05 セラロック、イノベーション、アクチボラグ Mechanical locking system for floor panels
JP6392847B2 (en) 2013-03-25 2018-09-19 ベーリンゲ、イノベイション、アクチボラグVaelinge Innovation Ab Floor board provided with mechanical fixing system and method for manufacturing the fixing system
JP2017530028A (en) 2014-07-16 2017-10-12 ベーリンゲ、イノベイション、アクチボラグVaelinge Innovation Ab Method for producing thermoplastic wear-resistant foil
FR3028312A1 (en) 2014-11-06 2016-05-13 Snecma Testing device

Citations (3)

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Publication number Priority date Publication date Assignee Title
US2990311A (en) * 1956-01-09 1961-06-27 Dennison Mfg Co Heat transfer
US4536434A (en) * 1983-10-20 1985-08-20 Dennison Manufacturing Co. Heat transfer laminate
WO2001096689A1 (en) * 2000-06-13 2001-12-20 Flooring Industries Ltd. Floor covering, floor panels, method for their realization

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990311A (en) * 1956-01-09 1961-06-27 Dennison Mfg Co Heat transfer
US4536434A (en) * 1983-10-20 1985-08-20 Dennison Manufacturing Co. Heat transfer laminate
WO2001096689A1 (en) * 2000-06-13 2001-12-20 Flooring Industries Ltd. Floor covering, floor panels, method for their realization

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WO2008142538A2 (en) 2008-11-27

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