ADHESIVE TAPE HAVING AN ANTI-SLIP SURFACE WHICH DOES NOT ADHERE TO THE ADHESIVE SURFACE AND MANUFACTURING METHOD THEREOF

Abstract

Adhesive tape that includes a support provided with a first or front face and a second or rear face, an adhesive layer that covers at least part of the rear face, a mixed layer that covers the front face. The mixed layer has two successive coatings that include an anti-slip coating and a anti-adherent coating, each of which can be carried out first or second, and which form an alternation of thin parts and thick parts. The coating carried out first covers a predetermined area of the surface of the front face, and the coating carried out secondly covers a predetermined area of the surface formed by the front face at least partially covered by the coating carried out first. The anti-slip coating covers an area comprised between 5 to 80% of the area of the front face with a first composition forming a layer having anti-slip properties, the layer having a minimum thickness of 4 m. The anti-adherent coating covers an area of between 20 to 100% of the area of the front face with a second composition forming a layer with anti-adherent properties, the layer with anti-adherent properties having a maximum thickness of 3 m.

Claims

1-15. (canceled)

16. An adhesive tape, comprising: a support provided with a front face and a rear face; an adhesive layer that covers at least part of the rear face; a mixed layer that covers the front face, the mixed layer including successive coatings of an anti-slip coating and an anti-adherent coating which collectively form an alternation of thin mixed layer regions and a thick mixed layer regions; wherein: the successive coating conducted first covers a predetermined area of the surface of the front face, and the successive coating conducted second covers a predetermined area of the surface formed by the front face at least partially covered by the successive coating conducted first, the anti-slip coating covers an area between 5% to 80% of the area of the front face with a first composition forming a layer having anti-slip properties, the layer having a minimum thickness of 4 m, and the anti-adherent coating covers an area of between 20% to 100% of the area of the front face with a second composition forming a layer with anti-adherent properties, the layer with anti-adherent properties having a maximum thickness of 3 m.

17. The adhesive tape of claim 16, wherein: the static coefficient of friction and/or the kinetic coefficient of friction of the mixed layer are respectively greater than or equal to 0.5, and the adhesion between the adhesive layer and the mixed layer is less than or equal to 250 gram-force per centimeter.

18. The adhesive tape of claim 16, wherein a product between a coverage rate of the successive coating conducted first and the thickness expressed in m of the successive coating conducted first is between 2 and 30.

19. The adhesive tape of claim 16, wherein: the thick mixed layer regions are formed by the layer deposited during anti-slip coating, and the thin mixed layer regions are formed by the layer deposited during anti-adherent coating.

20. The adhesive tape of claim 16, wherein the alternation of thick mixed layer regions and thin mixed layer regions forms a pattern chosen from a pattern of strips parallel to each other, a chevron pattern, a pattern of wavy lines, a pattern in checkerboard, or an arrangement of blocks.

21. The adhesive tape of claim 16, wherein the anti-slip coating has a thickness of between 7 m and 25 m.

22. The adhesive tape of claim 16, wherein exposed surfaces of the mixed layer are substantially planar.

23. The adhesive tape of claim 16, wherein the anti-slip coating is formed via a silicone-based composition which crosslinks under an effect of humidity or of a crosslinking agent, and/or of a catalyst.

24. The adhesive tape of claim 16, wherein the anti-adherent coating is produced using a composition chosen from: a composition based on silicone in aqueous emulsion which crosslinks under an effect of a crosslinking agent and/or of a catalyst, and a solvent-free silicone-based composition which crosslinks under an effect of a crosslinking agent and/or of a catalyst.

25. The adhesive tape of claim 16, wherein the mass of deposit of anti-slip composition per unit surface of the front face is between 12 g/m.sup.2 and 20 g/m.sup.2.

26. A method of manufacturing an adhesive tape provided with a support having a front face and a rear face covered at least in part with an adhesive layer, the method comprising: coating the front face with a first composition forming a layer with anti-slip properties having a minimum thickness of 4 m on a surface of between 5% and 80% of the area of the front face; coating the front face with a second resin composition forming a deposit with anti-adherent properties having a maximum thickness of 3 m on a surface of between 20% and 100% of the area of the front face, wherein an order of coating the front face is reversible such that the coating conducted first covers a predetermined area of a surface of the front face and the coating conducted second covers a predetermined area of the surface formed by the front face at least partially already covered by the coating conducted first.

27. The method of claim 26, wherein coating the front face with a first composition and coating the front face with a second resin composition are conducted via printing methods chosen from screen printing, heliography, and flexography.

28. The method of claim 26, wherein coating the front face with a first composition is conducted by screen printing and coating the front face with a second resin composition is conducted by heliography.

29. The method of claim 26, wherein coating the front face with a first composition and coating the front face with a second resin composition are conducted via two printing groups identified between them in order that a first printing group deposits a coating and a second printing group deposits the other coating only in areas not covered by the first printing group.

30. The method of claim 26, further comprising treating the layer formed by the coating conducted first using a treatment chosen from a corona surface treatment, a plasma surface treatment, or electrowetting.

31. The method of claim 26, further comprising crosslinking the layer having anti-slip properties.

32. The method of claim 26, further comprising crosslinking the layer having anti-adherent properties.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0071] Other advantages, aims and particular characteristics of the invention will emerge from the following non-limiting description of at least one particular embodiment of the adhesive tape and of the method of manufacturing such a tape, objects of the present invention, with regard to the appended drawings, in which:

[0072] FIG. 1 represents, schematically and in longitudinal section view, a first particular embodiment of an adhesive tape which is the subject of the present invention,

[0073] FIG. 2 represents, schematically and in longitudinal section view, a second particular embodiment of an adhesive tape which is the subject of the present invention,

[0074] FIG. 3 represents, schematically and in longitudinal section view, a third particular embodiment of an adhesive tape which is the subject of the present invention,

[0075] FIG. 4 represents, schematically and in the form of a flowchart, a particular succession of steps in the process of manufacturing an adhesive tape which is the subject of the present invention,

[0076] FIG. 5 represents, schematically, a device for manufacturing an adhesive tape which is the subject of the present invention,

[0077] FIG. 6 represents, schematically, in top view a particular embodiment of the adhesive tape which is the subject of the invention, which has a first pattern formed by the alternation of thick zones and thin zones,

[0078] FIG. 7 represents, schematically, in top view a particular embodiment of the adhesive tape which is the subject of the invention, which has a second pattern formed by the alternation of thick zones and thin zones,

[0079] FIG. 8 represents, schematically, in top view a particular embodiment of the adhesive tape which is the subject of the invention, which has a third pattern formed by the alternation of thick zones and thin zones and

[0080] FIG. 9 represents, schematically, in top view a particular embodiment of the adhesive tape which is the subject of the invention, which has a fourth pattern formed by the alternation of thick zones and thin zones.

[0081] The following numerical references are used in the figures and in the description which follows: 12, 14 and 16, Adhesive tapes according to the invention; 105 Support; 106 Front side of 105; 107 Back side of 105; 110 Adhesive layer; 120 or 140 Layer resulting from anti-adherent coating; 130 Layer resulting from anti-slip coating; 131 Thick parts of the mixed layer; 132 Thin parts of the mixed layer; 30 Device for manufacturing an adhesive tape according to the invention; 305 Unwinder; 306 Support roller 105; 315 and 330 First and second printing group; 317, 332 and 341 Dryers; 320 and 335 Cross-linking devices; 325 Corona treatment unit; 340 Adhesive layer coating group; 345 Winder; 346 Roll of adhesive tape according to the invention.

[0082] Reference numbers with four digits designate process steps.

DETAILED DESCRIPTION OF THE INVENTION

[0083] The present description is given on a non-limiting basis, each characteristic of an embodiment being able to be combined with any other characteristic of any other embodiment in an advantageous manner.

[0084] It should be noted now that FIGS. 1 to 3 are not to scale and that FIGS. 6 to 9 are to scale but that the scales can vary between two figures.

[0085] We observe, in FIGS. 1, 2 and 3, a schematic view of different embodiments of an adhesive tape 12, 14 and 16 subjects of the present invention.

[0086] The adhesive tape 12, 14 or 16 includes a support 105 intended to receive coatings to make it a functional tape.

Choice of Support and Adhesive Layer

[0087] Any type of support well known in the field of adhesive tapes can be used. In particular, it is possible to choose as support 105 a thin paper with high tensile strength, which may be transparent or opaque. The support may in particular be chosen from the family of offsets, krafts, coated or uncoated, rubbed or unrubbed, recycled unglued, glued on one face or on both faces. The weight of the support will preferably be chosen between 25 g/m.sup.2 and 220 g/m.sup.2, preferably between 40 g/m.sup.2 and 90 g/m.sup.2, for example 60 g/m.sup.2. The support may include a reinforcing grid made of cellulose fibers or textile fibers, for example cotton fibers.

[0088] The support can be chosen from reinforced papers.

[0089] The support 105 may also be a plastic film, such as for example a poly(ethylene) (abbreviated PE), a poly(propylene) (abbreviated PP), a polylactic acid (abbreviated PLA), a poly(vinyl chloride) (abbreviated PVC), a copolymer of PE and PP, a poly(terephthalate ethylene) (abbreviated PET), or even a biopolymer film. Such a support may, depending on the needs, be transparent or opaque, with a thickness comprised between 5 m to 200 m, preferably comprised between 10 m to 80 m, for example 30 m.

[0090] The support 105 may also be chosen from non-wovens, textiles, cardboard, and any other flexible support well known to those skilled in the art.

[0091] The support 105 is a rollable tape, of very long length in relation to its width and of small thickness in relation to its width, so that the support 105 has two main faces of non-negligible areas. One face of the support is arbitrarily called the front face 106, the other face is called the rear face 107.

[0092] The rear face 107 of the support 105 is coated with an adhesive layer 110. The adhesive layer 110 may include any adhesive well known to those skilled in the art which is suitable for use on a support as described above. Preferably, the adhesive layer comprises a pressure-sensitive adhesive (abbreviated PSA) or a self-adhesive. Preferably, the adhesive is chosen to have an immediate tack and an adhesive power on paper and cardboard such that it causes the destruction of this paper or cardboard upon opening when it is torn from the surface of the paper or cardboard. Advantageously, a hot melt or aqueous adhesive, of the synthetic rubber or acrylic type, is used. As an example, the product Technomelt PS 5020 N marketed by Henkel and the reference TLH 4280 E from Bostik may be used.

Properties of the Mixed Layer

[0093] The adhesive tapes 12, 14 and 16 according to the invention are remarkable in that the front face 106 of the support 105 comprises a mixed layer with anti-slip and anti-adherent properties, hereinafter called mixed layer.

[0094] The mixed layer of adhesive tapes 12, 14 and 16 has the particularity of having thick parts 131 and thin parts 132 relative to a cutting plane perpendicular to the plane formed by the front face 106, illustrated in FIGS. 1, 2, and 3. In other words, the thickness of the mixed layer varies between a low thickness and a high thickness, these thicknesses being preferably substantially uniform over the entire layer of the first coating 130.

[0095] The thin parts 132 are of smaller thickness than the thick parts 131. For example, the thin parts 132 have a thickness comprised between 1 and 10 m and the thick parts 131 have a thickness greater than 10 m, preferably greater than 20 m, very preferably greater than 25 m.

[0096] The mixed layer includes a first coating 130 with anti-slip properties forming the thick parts.

[0097] The mixed layer also includes a second coating, 120 or 140, forming the thin parts positioned between two successive thick parts.

[0098] The first coating 130, called anti-slip coating, is advantageously a coating comprising a silicone composition.

[0099] These may be single-component or multi-component compositions, preferably solvent-free.

[0100] Single-component compositions may consist of a silicone which crosslinks under the influence of humidity, preferably at room temperature. Such products are commercially available, for example the product sold under the trade name ELASTOSIL 50 by the company Wacker. The multi-component compositions may, for example, comprise a base silicone polymer (typically a polydimethylsiloxane with functional and auxiliary groups), a crosslinking agent (which may be a polydimethylsiloxane with hydrogenated groups) and a catalyst, which may be a compound of platinum dissolved in a polydimethylsiloxane.

[0101] In some embodiments, the anti-slip coating is produced with a silicone-based composition comprising expandable microspheres. For example, the composition includes the product SilForce SM3300 by the company Momentive and also includes non-expanded microspheres in aqueous dispersion, for example the product Expancel 820 SLU 40 marketed by the company Akzo Nobel.

[0102] In some embodiments, the anti-slip coating 130 is produced with a polyurethane-based composition, for example the product sold under the name ESACOTE SW3 by the company Lamberti.

[0103] The second coating, 120 or 140, has anti-adherent properties. Preferably, the adhesion force of the second coating, 120 or 140, with the adhesive layer 110 is less than the adhesion force between the adhesive layer 110 and the first coating 130.

[0104] The second coating, 120 or 140, called anti-adherent, is advantageously a coating comprising a silicone composition; it may be a multi-component composition based on an aqueous emulsion of a polydimethylsiloxane carrying vinyl groups. This composition may also include a catalyst (for example an aqueous emulsion of a platinum compound dissolved in a polydimethylsiloxane bearing vinyl groups) and a crosslinking agent (for example an aqueous emulsion of a methylhydrogen poly-siloxane).

[0105] In some embodiments, the anti-adherent coating, 120 or 140, is produced with a composition comprising the product sold under the name DEHESIVE EM 490, by the company Wacker.

[0106] In some embodiments, the anti-adherent coating, 120 or 140, is produced with a composition comprising the product TEGOR RC 1403, from the company EVONIK GMBH.

[0107] In some embodiments, the anti-adherent coating, 120 or 140, is produced with a composition comprising an aqueous dispersion of a polyethylene wax modified with a polytetrafluoroethylene, for example the product sold under the name DEUTERON OG 330 by the company DEUTERON GMBH.

[0108] The mixed layer is preferably configured to have a static coefficient of friction greater than or equal to 0.5, preferably greater than or equal to 1.

Evaluation of Anti-Adherent Properties

[0109] Tests were carried out by the applicant to compare the delamination force of some commercially available adhesive tape rolls and compare it to the delamination force between the mixed layer according to the invention and a standard PSA adhesive which corresponds to the test 3, below. Tests 1 and 2 are commercially available tape delamination tests performed for comparison.

[0110] The anti-adherent properties are evaluated according to the FTM 3 method proposed by the European Association of the Self-Adhesive Label Industry (FINAT), already presented above.

[0111] The width of the tapes used as a sample during these tests is set at 25 millimeters.

[0112] The resistance values (to delamination) measured during these tests, that is to say the adhesion values, are gathered in Table 1, below.

TABLE-US-00001 TABLE 1 Resistance [gf/cm] Test 1 192 Test 2 241 Test 3 10

[0113] Test 1 is a delamination test of a PP acrylic 25 pm H.T. AC 518N adhesive tape, supplied by Ocopa Emballages. This tape has a BOPP (abbreviated from Biaxally Oriented PolyPropylene) backing coated with an acrylic adhesive. In other words, the measured resistance corresponds to the delamination resistance between the BOPP backing and an acrylic adhesive coated on a BOPP backing.

[0114] Test 2 is a delamination test of a Tesa 4313 PVO adhesive tape. This adhesive tape has a paper backing and a solvent-free adhesive. The measured resistance therefore corresponds to the resistance to delamination between paper and a solvent-free adhesive coated on a paper support.

[0115] The delamination forces measured during Tests 1 and 2 allow satisfactory unwinding of the adhesive tapes, without excessive resistance.

[0116] Test 3 is a delamination test of an adhesive tape according to the invention. The adhesive tape tested during Test 3 includes a kraft backing whose rear face is coated with a TLH 4280 E adhesive marketed by Bostik. TLH 4280 E adhesive is a Pressure Sensitive hot melt Adhesive (PSA). The front face of said support is coated with a mixed layer according to the invention.

[0117] Test 3, which aims to simulate unwinding of an adhesive tape according to the invention, measures the resistance to delamination between the TLH 4280 adhesive coated on the kraft support and a mixed layer according to the invention coated on a kraft support.

[0118] It is noted that the mixed layer tested has low adhesion with the adhesive layer, measured at 10 gf/cm of separation resistance, allowing easy unwinding of the adhesive tape according to the invention. Preferably, the separation resistance is less than or equal to 250 gram-force per centimeter (gf/cm). These adhesion values are sufficiently low to allow the adhesive layer to come into contact with the mixed layer and therefore the adhesive tape to be wound and unwound during use.

Organization of Layers According to Embodiments of the Adhesive Tape

[0119] According to a particular embodiment illustrated in FIG. 1, we observe that a total flat of anti-adherent coating 120 has been applied to the front face 106 of the support 105. By total flat we mean the deposition of a coating layer of constant thickness, deposited over the entire surface of the front face 106.

[0120] On top of the flat of the anti-adherent coating 120, an anti-slip coating 130 was deposited discontinuously. Mounds of anti-slip coating 130 of constant thickness were deposited at regular intervals on the exposed surface of the flat of the anti-adherent coating 120. Printing methods such as screen printing, heliography and flexography make it possible to obtain a repeated pattern on the first coating layer 130 having thick parts regularly spaced between them.

[0121] A particular manufacturing process making it possible to obtain an adhesive tape illustrated in FIG. 1 is illustrated in FIG. 4 and detailed below.

[0122] In particular embodiments, the first coating 130 and the second coating 120 are one and the same composition which have both anti-slip and anti-adherent properties.

[0123] Thus the thick parts of the mixed layer of the adhesive tape illustrated in FIG. 1 are formed of a thin layer of second coating 120 topped with a thick deposit of coating 130 while the thin parts are formed of a thin layer of the second coating 120.

[0124] According to a particular embodiment illustrated in FIG. 2, mounds of anti-slip coating 130 of constant thickness were deposited at regular intervals on the front face 106 of the support 105. After this first coating, a second deposit of anti-adherent coating 140 was made on top, depositing a thin layer of second coating 140 on the anti-slip coating 130 and on the still exposed parts of the face 106.

[0125] According to the particular embodiment illustrated in FIG. 2, the thick parts of the mixed layer are formed of a thin layer of second coating 140 overlying a thick deposit of coating 130, and the thin parts are formed of a thin layer of second coating 140.

[0126] According to a particular embodiment illustrated in FIG. 3, the deposition of anti-adherent coating 120 and the anti-slip coating 130 were carried out successively, so that areas of the front face 106 are covered by thick deposits of anti-slip coating 130 and the remaining areas are covered with a thin deposit of anti-adherent coating 120.

[0127] According to this particular embodiment, the steps of depositing anti-slip coating and anti-adherent coating are carried out by means of two printing groups identified between them so that a first printing group deposits a coating and a second printing group deposits the other coating only in the areas not covered by the first printing group.

[0128] According to the particular embodiment illustrated in FIG. 3, the thick parts of the mixed layer are formed of a thick coating deposit 130 in contact with the front face 106, and the thin parts of the mixed layer are formed of a thin second coating layer 140 in contact with the front face 106.

Pattern Formed by the Alternation of Thin Parts and Thick Parts

[0129] Whatever the embodiment, the alternation of thick parts and thin parts of the mixed layer preferably forms a pattern, that is to say a design formed by the alternation of thick parts and thin parts, repeated at regular intervals on the mixed layer. This pattern can be a geometric shape, for example strips parallel to each other, chevrons, wavy lines, or even a checkerboard.

[0130] This pattern can also represent a logo or form letters or a sentence. For example, the pattern is chosen from those illustrated in FIGS. 6, 7, 8, and 9, in which the thick parts are shown in black color and the thin parts are shown in white color. It is noted that the patterns illustrated in FIGS. 6 and 7 are of the same type but the scale of the geometric shape forming the pattern is reduced on the pattern illustrated in FIG. 7, so that the coverage rate is lower.

Evaluation of Anti-Slip Properties Depending on the Pattern

[0131] The applicant has carried out tests to evaluate the anti-slip properties of a tape comprising a paper support covered with a coating with anti-slip properties made with a silicone-based composition which crosslinks under the effect of a catalyst.

[0132] The results of these tests are summarized in Table 2 below. The coefficient of friction is determined by the horizontal plane method for determining the static and kinetic coefficients of friction according to standard NF ISO 15359:1999, already described above. The thickness of the anti-slip layer is expressed in m and the coverage rate (also called inking rate) of the paper support by the anti-slip coating is expressed as a percentage.

TABLE-US-00002 TABLE 2 Coverage rate Thickness Coefficient of Pattern [%] [m] cinetic friction P Total flat 100 10.1 0.6 10.1 Chevron 16 16 9.8 0.6 1.57 Chevron 16 16 13.2 0.9 2.11 Chevron 30 30 14.2 1.1 4.26 Checkerboard 50 13 0.8 6.5

[0133] It is noted that the checkerboard pattern is illustrated in FIG. 8, that the chevron pattern 16 is illustrated in FIG. 7 and that the chevron pattern 32 is illustrated in FIG. 6.

[0134] It can be seen that equivalent anti-slip performances, that is to say substantially identical kinetic coefficients of friction, are obtained for a total flat area (coverage rate of 100%) and for a chevron pattern 16 (coverage rate of 16%), with a thickness of approximately 10 m, respectively equal to 10.1 m and 9.8 m.

[0135] A thicker anti-slip layer makes it possible to obtain a greater kinetic coefficient of friction, as illustrated by the tests carried out with the chevron 16 patterns of 9.8 m and 13.2 m thickness which have a coefficient of friction of 0.6 and 0.9, respectively.

[0136] The 30 chevron pattern, with a greater coverage rate and a greater layer thickness, further increases the kinetic coefficient of friction.

[0137] Advantageously, the P value obtained by multiplying the coverage rate by the thickness (expressed in m) is comprised between 2 and 30. More preferably it is comprised between 2 and 20, very preferably between 2 and 5.

Evaluation of Anti-Slip Properties Depending on the Mass of the Anti-Slip Composition Deposit Per Unit Area

[0138] Depending on the inking rate of the anti-slip layer and the thickness of the anti-slip layer, the mass of the anti-slip composition deposit per unit surface area of the front face (expressed in grams per square meter) varies.

[0139] The anti-slip properties as a function of the mass of deposit of anti-slip composition were evaluated on various samples, by determining the static and kinetic coefficients of friction.

[0140] The coefficient of friction is determined by the horizontal plane method for the determination of the static and kinetic coefficients of friction according to standard NF ISO 15359:1999, already described above.

[0141] The applicant has determined that a mass deposit of anti-slip composition comprised between 5 g/m.sup.2 and 30 g/m.sup.2 offers good anti-slip performance while allowing a saving in the quantity of composition used during the anti-slip coating.

[0142] During tests carried out by anti-slip coating according to the invention, the values of static and kinetic coefficients of friction measured on the samples obtained are of the order of 0.8 or less for deposits of anti-slip composition with a mass less than 5 g/m.sup.2. In order to obtain optimal static and kinetic coefficients of friction, greater than 0.85, it has therefore been determined that a deposit of anti-slip composition with a mass greater than 5 g/m.sup.2 is preferable.

[0143] During tests carried out by anti-slip coating according to the invention, the values of static and kinetic coefficients of friction measured on the samples obtained are of the order of 1.2 or greater for deposits of anti-slip composition with an approximate mass of 25 g/m.sup.2. It can be seen that by increasing the mass of the anti-slip composition deposit beyond 25 g/m.sup.2, the gains in terms of increasing the values of static and kinetic coefficients of friction are minimal. In order to save on the quantity of composition used during anti-slip coating, it has therefore been determined that a deposit of anti-slip composition with a mass of less than 30 g/m.sup.2 is preferable.

[0144] During additional tests, it was determined that a deposit mass of anti-slip composition comprised between 10 g/m.sup.2 and 25 g/m.sup.2 or even comprised between 12 g/m.sup.2 and 20 g/m.sup.2 is even more advantageous because such a deposit makes it possible to obtain static and kinetic coefficients between 1 and 1.2 while saving on the quantity of composition used during the anti-slip coating.

Method and Device for Manufacturing an Adhesive Tape

[0145] It can be seen in FIG. 4 a succession of particular stages of the process of manufacturing an adhesive tape which is the subject of the present invention. This process makes it possible in particular to produce an adhesive tape 12, 14 or 16 as described previously with reference to FIGS. 1 to 3. The adhesive tape comprises a support provided with a face called the front face and a face called the rear face.

[0146] It can be seen in FIG. 5 a device 30 allowing the manufacture of an adhesive tape by the process described in FIG. 4.

[0147] The main purpose of said method and of the device 30 is to cover at least partly the front face of an adhesive tape 12, 14 or 16 with a mixed layer with anti-slip and anti-adherent properties.

[0148] The process uses a first so-called anti-slip coating and a second so-called anti-adherent coating. These coatings already described above are not described again here.

[0149] The method includes a step 1005 of providing a support, of the type of support 105, described previously. The support 105 is typically supplied in the form of a roll 306 unrolled by an unwinder 305, under low mechanical tension, for its coating during the different stages of the process.

[0150] During a deposition step 1015 the anti-adherent coating is deposited in the form of a total flat on the front face of the support. Preferably, this step 1015 is carried out by a first printing group 315 configured to implement a screen printing, heliography or flexography method. Preferably this step is carried out using a heliographic method.

[0151] According to the heliographic method, the pattern to be printed is engraved on a cylinder.

[0152] During printing, the ink is deposited in the cells of the engraved cylinder, then the support to be printed is pressed between the engraved cylinder and a printing cylinder.

[0153] In Other Embodiments, this Step 1015 is Carried Out by an Inkjet Type Method, by Fiberization, by a Nozzle System or by any Other Process Allowing Significant Deposits.

[0154] In some embodiments, implemented when the anti-adherent coating is a crosslinkable coating, the method comprises a crosslinking step 1020. The crosslinking step 1020 is preferably carried out thermally, for example by hot air or by infrared radiation, in a crosslinking device 320. Depending on the nature of the coating, photochemical crosslinking by ultraviolet irradiation, or by any other crosslinking technique can be considered. Optionally, this step is preceded by a drying step using a dryer 317.

[0155] In some embodiments, the method comprises a step 1025 of corona surface treatment on the total flat of the anti-adherent coating surface deposited during the previous steps, with a view to facilitate the adhesion of the second coating with the first coating which will be deposited during the following step. The corona treatment step is carried out in a corona treatment unit 325 equipped with an electrode. This corona treatment is known as such to those skilled in the art and will not be explained here in greater detail. Any other surface treatment process having the effect of increasing the wettability of the surface, such as a plasma surface treatment or electrowetting, can also be used.

[0156] During a step 1030, the coating with anti-slip properties is deposited on the front face of the support so as to create thick parts of the mixed layer. This step is carried out by a second printing group 330. Preferably, these thick parts are regularly spaced. Preferably, the second printing group uses screen printing, heliography or flexography. Very preferably, the printing method used is a screen printing method.

[0157] According to the screen printing method, the pattern to be deposited, here formed of thick parts spaced apart from each other, is represented in negative on a finely perforated screen placed around a first cylinder. A mobile scraper spreads the coating on a sieve and forces it to pass through the perforations not blocked by the screen, to be deposited on the support.

[0158] Optionally, this step 1030 is followed by a second drying step through a dryer 332.

[0159] In some embodiments implemented when the anti-slip coating is a crosslinkable coating, the process comprises a crosslinking step 1035 similar to the crosslinking step 1020 already described above. This second crosslinking step is carried out in a second crosslinking device 335.

[0160] During a step 1040 a layer of adhesive is deposited on the rear face of the support according to in-line coating methods well known to those skilled in the art, which are not described in detail here. Said step 1040 is carried out by means of a coating group 340. Depending on the nature of the adhesive used, the adhesive tape may be circulated in a direction 352 leading to a circuit comprising a dryer 341 or circulated in a direction 351 leading directly to a winder 346, without prior drying.

[0161] At last, during a step 1045 the adhesive tape 12, 14 or 16 obtained by all of the previous steps is rolled up on itself. Incidentally, the method may include a step of cutting the roll 345 obtained into a plurality of rolls of smaller size which are more convenient to handle. This cutting can be done in a known manner during winding, by slitting to obtain several rolls of smaller width, and/or by cutting to obtain several shorter rolls.

[0162] Alternatively, the method may include, instead of step 1045, a format cutting step, that is to say cutting the adhesive tape into pieces of predetermined size.

[0163] It is of course understood that the steps described above for the process according to the invention can be carried out continuously on the same production line or discontinuously, by step or by group of steps, on separate production lines.