JP2013022748A - Non-slip sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-slip sheet which has sufficient non-slip properties even under a wet state and is less stimulative to bare skin.SOLUTION: The non-slip sheet 1 includes a base material 10 having a first main surface 11 and a second main surface 12 opposite to the first main surface. The first main surface 11 includes an embossed shape composed of a first irregular pattern and a second irregular pattern disposed on projections of the first irregular pattern. The pitch of projections of the first irregular pattern is 50 μm or more and 200 μm or less, the pitch of recesses of the second irregular pattern is 20% or less of the pitch of recesses of the first irregular pattern, the maximum height (Rmax) of the surface roughness of an area including the first irregular pattern and second irregular pattern is 25 μm or more and 50 μm or less, and the maximum height (Rmax) of the surface roughness of an area including only the second irregular pattern is 8 μm or more and 15 μm or less. The recesses of the first irregular pattern and the recesses of the second irregular pattern which constitute the embossed shape communicate with each other.

Description

The present invention relates to an anti-slip sheet that can be attached to the surface of a facility, tool, or the like that is directly touched by human skin, and particularly to a surfboard surface application sheet that is suitable for appropriately preventing the surface of a surfboard from slipping. Is.

  At present, the anti-slip treatment is applied in various fields in various facilities and tools used in a wet environment in real life, and is appropriately put to practical use according to the application. For example, the surfboard will be specifically described as follows.

  Surfing is a year-round marine sport that allows surfboard users to quickly move on the board, move weight, and control delicate feet when paddling, getting out, taking off, riding, etc. Is required. Therefore, the surface of the surfboard is required to be appropriately treated so that the user does not slip during use so that the surfboard user can sufficiently control the surfboard in a humid environment. .

  For example, in the past, as a means to ensure anti-slip properties, it is generally practiced to control the surfboard surface slip by applying wax to the surfboard surface, or by attaching a sheet having an uneven structure. Has been.

  U.S. Pat. No. 6,057,031 describes a friction control article for use in wet and dry conditions having an array of at least 100 upright stems per square inch. Patent Document 2 describes an anti-slip mat composed of a surface layer having a plurality of water permeable holes and a base material layer having a foam structure having an open cell structure on the lower surface of the surface layer. In Patent Document 3, formed by an elastic member such that a non-slip protrusion, for example, a non-slip protrusion, has a large number of quadrangular prisms at regular intervals or irregular intervals on the surface of the sheet body. Is described. Japanese Patent Application Laid-Open No. H10-228667 describes a slip-on wax applied to the surface of a surfboard.

JP-T-2004-505810 JP 2000-14521 A Noto 3006361 publication JP 2006-305088 A

Conventional anti-slip sheets have been able to ensure some degree of anti-slip even under wet conditions, but when users use these anti-slip sheets in direct contact with bare skin for a long time, It could be a pain because of rubbing.

  The present invention has been made to solve these problems, and the problem is that the anti-slip property of the anti-slip sheet can be ensured even under wet conditions, and the anti-slip sheet. As for the bare skin irritation, the object is to provide an anti-slip sheet capable of suppressing bare skin irritation as much as possible.

  In order to solve the above problems, as one aspect of the present invention, (1) an anti-slip sheet comprising a base material having a first main surface and a second main surface opposite to the first main surface; The first main surface has an emboss shape composed of a first concavo-convex pattern and a second concavo-convex pattern arranged on the convex portion of the first concavo-convex pattern, and the concave portion of the first concavo-convex pattern The pitch of the concave portions of the second concave-convex pattern is 20% or less of the pitch of the concave portions of the first concave-convex pattern, and includes the first concave-convex pattern and the second concave-convex pattern. The maximum height (Rmax) of the surface roughness of the area is 25 μm or more and 50 μm or less, and the maximum height (Rmax) of the surface roughness of the area including only the second concavo-convex pattern is 8 μm or more and 15 μm or less. Constituting the first concave Slip resistant sheet communicating with each other are provided with recesses and the recess of the second concave-convex pattern of the pattern.

Here, the pitch value of the concave portions of the concave / convex pattern and the maximum height value (Rmax) of the surface roughness are values based on the surface roughness specified in JISB0601.
Specifically, these values are values measured using the roughness meter function of the KEYENCE laser microscope. Since the laser microscope is a laser type, it can arbitrarily measure the “line roughness” of a straight line / curve on the image and the “surface roughness” of an arbitrarily designated region in a non-contact manner.

  Here, the measurement using the KEYENCE laser microscope will be described in detail.

  1) The area including the first concavo-convex pattern and the second concavo-convex pattern (hereinafter referred to as “wide area”) includes both the first concavo-convex pattern and the second concavo-convex pattern on the surface of the measurement object. As described above, the surface roughness measurement range is a section divided by squares and rectangles of 100 μm to 2000 μm in length and 100 μm to 2000 μm in width. In the evaluation of the present invention, specifically, the wide area was defined as a section partitioned by a rectangle having a length of 300 μm and a width of 1300 μm.

  2) An area including only the second concavo-convex pattern (hereinafter referred to as “narrow area”) is a surface roughness measurement range of 10 μm in length so that only the second concavo-convex pattern is included on the surface of the measurement object. It is a section divided into squares and rectangles of ˜40 μm and widths of 10 μm to 40 μm. Here, in the selection of the narrow area, first, the field of the first uneven pattern is observed in the narrow area after observing the field of view of the wide area so that only the second uneven pattern according to the present invention is included. The section is selected so that the concave portion is not included. In the evaluation of the present invention, specifically, the narrow area was divided into squares of about 20 μm in length and about 20 μm in width.

  3) The pitch of the concave portions of the first concave / convex pattern refers to the number of the concave portions of the first concave / convex pattern existing in the line segment by observing a straight line “line roughness” at an arbitrary position within the visual field of the wide area. It is obtained by measuring.

  4) The pitch of the concave portions of the second concave / convex pattern refers to the number of concave portions of the second concave / convex pattern existing in the line segment by observing the straight line “line roughness” at an arbitrary position within the field of view of the wide area. It is obtained by measuring.

  5) The maximum height (Rmax) of the wide area is obtained by measuring the maximum height (Rmax) of the “surface roughness” of the wide area defined above.

  6) The maximum height (Rmax) of the narrow area is obtained by measuring the “maximum height (Rmax) of surface roughness” of the narrow area defined above.

  As another aspect of the present invention, there is provided (2) the anti-slip sheet according to (1) above, wherein the substrate has a surface hardness in the range of 50 to 75 in Shore A durometer value.

  Here, the Shore A durometer value is a value specified in the type A durometer of JISK6253.

  Furthermore, as another aspect of the present invention, (3) the substrate has a hard sheet layer on the second main surface side, and the hard sheet layer is provided with an adhesive layer on the surface opposite to the substrate surface side. Furthermore, the anti-slip sheet according to any one of the above (1) and (2) is provided.

  Furthermore, as another aspect of the present invention, there is provided a surfboard having the anti-slip sheet according to any one of (1) to (3).

  According to the anti-slip sheet of the present invention, sufficient anti-slip property can be secured even when used in a wet state, and the anti-slip sheet user can directly apply his / her own skin to the sheet for the skin irritation of the anti-slip sheet. Even if contacted, it is possible to suppress irritation to the bare skin as much as possible.

FIG. 1 is a cross-sectional view showing a configuration of an example of an anti-slip sheet according to the present invention. FIG. 2 is a schematic cross-sectional view showing a situation where the embossed layer of the anti-slip sheet according to the present invention is microscopically observed. FIG. 3 is a plan view of the anti-slip sheet showing a microscopic observation of the communication channel structure of the embossed layer of the anti-slip sheet according to the present invention. FIG. 4 is a schematic cross-sectional view showing a state and process of discharging water through the communication channel of the embossed layer on the surface of the anti-slip sheet, and FIG. 4 (a) is a cross-sectional view of the submerged anti-slip sheet itself. FIG. 4B is a cross-sectional view of a submerged anti-slip sheet crushed by a human foot, and FIG. 4C is a schematic diagram illustrating a situation where water is discharged on the anti-slip sheet. FIG. 5 is a plan view of the surfboard showing a state in which the anti-slip sheet according to the present invention is attached to the surface of the surfboard (the side on which the surfboard user rides). FIG. 6 is a cross-sectional view schematically showing a manufacturing process of an anti-slip sheet having an adhesive layer according to the present invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and the general knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that design changes, improvements, and the like can be made as appropriate based on the above.

  FIG. 1 shows an embodiment of an anti-slip sheet according to the present invention using a cross-sectional view. As shown in FIG. 1, the anti-slip sheet 1 is configured as a laminate in which a base layer 10 having an emboss shape as an emboss layer 15, a hard layer 50, and an adhesive layer 60 are laminated in this order.

  That is, the hard sheet layer 50 is provided on the second main surface side 12 of the base material layer 10 having the first main surface 11 and the second main surface 12, and the hard sheet layer on the side opposite to the base material 10. An adhesive layer 60 is provided on the surface of 50.

  FIG. 2 shows a schematic cross section showing a situation where the embossed layer 15 on the first main surface of the base material 10 of the anti-slip sheet 1 according to the present invention is microscopically observed. As shown in FIG. 2, the first main surface of the base material layer of the anti-slip sheet of the present invention is disposed on the entire surface or part of the first uneven pattern 30 and the convex portions of the first uneven pattern. The second concavo-convex pattern 20 is provided.

  The concave pitch 32 of the first concavo-convex pattern is 50 μm or more, preferably 100 μm or more and 200 μm or less, preferably 150 μm or less in plan view.

  The above pitch is obtained by measuring while confirming the surface with the above-mentioned laser microscope. The measured value of the surface roughness related to the recess depth 36 of the first uneven pattern in the wide area including the first uneven pattern and the second uneven pattern, that is, the maximum height (Rmax) is 25 μm or more and 50 μm or less. It is. On the other hand, the concave pitch 22 of the second uneven pattern is 20% or less, preferably 10% or less, more preferably 5% or less of the concave pitch of the first uneven pattern. The measured value of the surface roughness of the narrow area related to the recess depth 34 of the second uneven pattern, that is, the maximum height (Rmax) is 8 μm or more and 15 μm or less.

  This is because, within these ranges, the non-slip sheet is actually less irritating to the skin and can be drained well.

  That is, by having a plurality of types of patterns of the first concavo-convex pattern and the second concavo-convex pattern defined by the above dimensions, the concavo-convex can be arranged at a higher density on the anti-slip sheet surface, and as a result, the sheet The contact angle with respect to the water which the surface has can be adjusted. As a result, the surface of the sheet is likely to repel water, so that it is difficult to form a water film and the hydroplane phenomenon is less likely to occur, so that the anti-slip property of the sheet itself can be finally improved.

  In addition, since the water repelled from the sheet | seat surface will be introduce | transduced into the recessed part of a 1st uneven | corrugated pattern or the recessed part of a 2nd uneven | corrugated pattern, it will be discharged | emitted from a sheet | seat so that it may mention later. Further, the surface roughness of the second concavo-convex pattern which occupies most on the sheet surface has a maximum height (Rmax) of 8 μm or more and 15 μm or less, so even if the skin touches the sheet directly for a long time, The irritation can be very low.

  FIG. 3 is a microscopic observation of the embossed layer 15 present on the first main surface of the base material having the embossed shape of the anti-slip sheet according to the present invention in plan view from above. As shown here, the embossing layer 15 is formed so that the concave portions 21 of the second concave / convex pattern 20 arranged on the convex portions of the first concave / convex pattern 30 communicate with each other and the concave portions 31 of the first concave / convex pattern 30. Communicate. In addition, the concave portions 31 of the first concave / convex pattern communicate with each other. Thus, the embossed layer 15 of the slip resistant sheet according to the present invention has a dense channel (water channel) structure as a whole. Here, the recesses communicate with each other means that water repelled from the sheet surface is introduced into the recesses of the first uneven pattern or the recesses of the second uneven pattern, and then discharged from the anti-slip sheet surface. This is to form a channel (water channel) that is useful for When the embossing layer 15 of the first main surface 11 having the embossed shape of the base material of the anti-slip sheet is produced by the extrusion molding method, the concave embossed shape provided on the chill roll is made convex. It can be formed by transferring. For example, the roll surface of the chill roll 123 shown in FIG. 6 is first processed over the entire surface so that the depth of the concave emboss is in the range of 25 to 100 μm, and the depth is 25 to 25 μm. Embosses with minute irregularities are processed on a 100 μm concave emboss with a pattern that includes a depth in the range of 5 to 20 μm.

  The base material of the anti-slip sheet according to the present invention preferably has a surface hardness in the range of 50 to 75 as a Shore A durometer value. This is because it is necessary to ensure sufficient flexibility. These ranges are preferable in the case of a soft material of 50 or less, the first uneven pattern is crushed by a load during use and the channel (water channel) cannot be maintained, and when the hardness is 75 or more, for example, In the anti-slip sheet for surfboards, it is difficult to maintain the grip property because it does not follow the weight shift at the time of use, and the irritating skin of the surfboard user is increased.

  In addition, the material of the base material of the anti-slip sheet according to the present invention is preferably a polyolefin-based thermoplastic material, particularly a polyethylene-based thermoplastic material, which is excellent in processability, weather resistance, water resistance and the like. Specifically, linear low density polyethylene (LLDPE) is suitable.

  The resin used as a base material includes a crosslinking agent, a surface modifier, a curing agent, a surfactant, a hard bead, a flame retardant, an ultraviolet absorber, an oxidation stabilizer, a tackifier resin, a colorant, and an antibacterial agent. Etc. can be included.

The thickness of the substrate is 50 μm or more, preferably 100 μm or more and 500 μm or less, preferably 300 μm or less, from the viewpoint of material strength and weight reduction of the sheet itself.
In the anti-slip sheet according to the present invention, a hard layer 50 can be provided to reinforce the base material layer 10.

  The purpose of providing the hard layer is to prevent the anti-slip sheet from extending when the anti-slip sheet is attached to the surfboard, for example, by applying tension, so that the attaching operation can be easily performed. In other words, by providing a hard layer, it is possible to prevent the non-slip sheet from being stretched, and there is no generation of useless residual stress in the anti-slip sheet, and the sheet may shrink over time. The anti-slip sheet can be prevented from peeling off at the interface between the adhesive layer of the anti-slip sheet and the surfboard body.

  The hard layer of the anti-slip sheet according to the present invention is preferably a flexible but highly stretchable material such as a polymer film having stretch resistance. Specifically, ethylene vinyl acetate copolymer resin (EVA) is suitable.

  The thickness of the hard layer is determined so as to satisfy a desired strength at, for example, 20 μm or more and 100 μm or less.

  The adhesive layer of the anti-slip sheet according to the present invention includes an adhesive having a natural rubber resin, an adhesive having a synthetic (SBR, SIS, etc.) rubber resin, an adhesive having a silicone resin, and an acrylic resin. An adhesive, an adhesive having a polyethylene resin, or the like can be used.

  In particular, when the anti-slip sheet is used outdoors, the pressure-sensitive adhesive layer is preferably a pressure-sensitive adhesive having a weather-resistant silicone resin or a pressure-sensitive adhesive having an acrylic resin. Furthermore, it is more preferable to use a pressure-sensitive adhesive having an acrylic resin from the viewpoint of easy market availability of the material itself.

  In addition, when an adhesive having an acrylic resin is used as the adhesive layer, the adhesive can be appropriately crosslinked with an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, a metal chelate-based crosslinking agent, etc. in consideration of removability. it can.

  FIG. 4 shows the state and process of water discharge through the channel (water channel) where the embossed layer 15 communicates with the surface of the anti-slip sheet.

  FIG. 4A shows a state where the first main surface of the anti-slip sheet is submerged by water while the anti-slip sheet is in use when wet.

  FIG. 4B shows a state in which a contact object (for example, a surfboard user's bare skin (foot) 200 in a surfboard) is in contact with the anti-slip sheet while applying a load. In this state, it is conceivable that the embossed layer 15 portion to which the load is applied is slightly flattened by the concave portion 21 of the second concave / convex pattern, but the concave portion 31 of the first concave / convex pattern is raised in the cross section. The channel (water channel) is thought to have been maintained, although it may become clogged.

  (C) in FIG. 4 schematically shows the state of drainage of the flood water on the slip resistant sheet when the contact object contacts the slip resistant sheet 1 while applying a load. In the figure, the arrow indicates the direction in which water is discharged from the sheet. Therefore, since water is efficiently discharged from the anti-slip sheet through the channel (water channel) formed by the concave portions 31 of the first uneven pattern of the emboss layer, the hydrous is considered to be one of the causes of slipping. It becomes difficult to cause a plain phenomenon, and as a result, the anti-slip property of the anti-slip sheet can be improved. At this time, the flattening of the uneven portion of the second uneven pattern contributes to increasing the contact area with the contact object and enhancing the adsorption effect between them, and from this point of view also improves the anti-slip characteristics of the anti-slip sheet It will be possible to let you.

  FIG. 5 shows an example of a surfboard 100 on which an anti-slip sheet according to the present invention is pasted. As shown in FIG. 5, the anti-slip sheets 1 and 2 according to the present invention are arbitrarily attached to the entire surface or a part of the surface of the surfboard on the side where the surfboard user rides as required by the surfboard user. Yes.

  For example, the anti-slip sheets 1 and 2 according to the present invention are conventional anti-slip sheets, that is, a thick (5 mm or more) thick unevenness (5 mm or more) is formed on the surface to control the movement of the board. It can affix on a part other than the anti-slip sheet 3 in a rectangular or circular shape. In addition, the anti-slip sheets 1 and 2 according to the present invention may be separated or separated from each other, and can be arranged according to the rider's style. In this case, the anti-slip sheet according to the present invention is suitable because the surfboard user is shirtless before riding on the surfboard and has a prone posture on the surfboard. That is, the anti-slip sheets 1 and 2 according to the present invention have a smooth surface so as not to irritate the skin of the surfboard user as much as possible, and between the soles when the surfboard user rides on the water. This is preferable because it has a surface uneven structure sufficient to maintain an appropriate frictional force and traction.

  In addition to the above base material, it is preferable to consider the use of a transparent resin as the base material of the anti-slip sheet for surfboards. This is to ensure the design property of the surfboard body as it is. The transparent resin is not limited to these, but for example, any of polyurethane, vinyl chloride polymer, acrylic polymer, polyester, polycarbonate, polyamide, polyolefin, polystyrene, silicone, fluorine polymer, epoxy polymer, etc. One kind or a mixture of two or more kinds can be used.

  Next, the effects that occur when the anti-slip sheet according to the present invention is attached to the surfboard shown in FIG. 5 will be described as follows.

  1) The surfboard to which the anti-slip sheet according to the present invention is attached has good anti-skid property and grip property on the surface of the surfboard even in a wet environment, so that the riding control of the board itself is good.

  2) Since the surfboard to which the anti-slip sheet according to the present invention is attached is not coated with wax, the maintenance of the board is easy and contamination of the sea can be prevented. FIG. 6 shows an example of the manufacturing process of the anti-slip sheet according to the present invention.

  A raw material for the base layer of the anti-slip sheet (for example, a polyolefin-based thermoplastic resin) and a raw material for the hard layer of the anti-slip sheet (for example, an ethylene vinyl acetate copolymer resin (EVA) which is a stretch resistant polymer film). , Co-extruded into a sheet using a T-die 124, and pressurized and cooled using a nip roll 122 and a chill roll 123. Thereby, the embossed shape provided in the chill roll can be transferred to the substrate surface (first main surface). By rotating the chill roll 123 in the direction of the arrow P, the sheet made of the base material layer and the hard layer advances forward, and is further coated with an adhesive coating solution using the coating machine 130 in the coating process. . Next, the anti-slip sheet is hot-air dried in a drying furnace 131 in a drying process, and then wound up by a winding roll 140.

  Here, the chill roll is obtained by surface-treating the roll surface by the sand plast method as follows.

For example, the roll surface of the chill roll is subjected to sand plast treatment using a plurality of sizes of alumina particles (10 mesh to 200 mesh, more preferably 50 mesh to 200 mesh) with a plast pressure of 2.0 kgf / cm ² .

  The temperature of the anti-slip sheet material extruded from the T-die 124 can be appropriately determined depending on the type of the anti-slip sheet material.

  The thickness of the anti-slip sheet composed of the base material layer and the hard layer extruded from the T-die 124 is preferably 70 to 600 μm.

  The extrusion molding machine used for extruding the anti-slip sheet material is not particularly limited as long as the anti-slip sheet material can be co-extruded into a sheet and a two-layer sheet can be molded, and a known one is used. be able to. For example, a screw type extruder can be used. Extrusion conditions can be appropriately determined depending on the anti-slip sheet material used. A T-die 124 is attached to the tip of the extruder to form a non-slip sheet material, for example, in the form of a sheet having a width of 50 cm to 200 cm. However, the T-die 124 is not particularly limited, and an anti-slip property to be produced. It can be determined appropriately according to the shape of the sheet.

  The pressure when the anti-slip sheet material A (no embossed layer on the substrate surface) 120 composed of the coextruded base material layer and the hard layer is pressed by the chill roll 123 and the nip roll 122 is preferably 0.4 MPa or more. More preferably, the pressure is 0.5 to 1.0 MPa. If the pressure is less than 0.4 MPa, the embossed shape of the chill roll 123 may not be transferred depending on the type of raw material (resin) to be molded.

  Moreover, 10-60 degreeC is preferable and the temperature of the chill roll 123 has more preferable 20-40 degreeC. If the temperature is lower than 10 ° C., condensation may occur and water may be involved. If the temperature is higher than 60 ° C., it may be difficult to sufficiently cure the anti-slip sheet.

  Further, an acrylic pressure-sensitive adhesive 2 is further applied to the surface opposite to the embossed surface of the anti-slip sheet material B (having an embossed layer on the substrate surface) 126 made of the base material layer and the hard layer manufactured by the above manufacturing method. The containing coating liquid 129 is applied. For example, a knife coater 130 can be used as the coating apparatus.

  The anti-slip sheet according to the present invention can be used for many types of equipment and tools used by humans by directly touching the skin under a moist environment, in addition to the examples used for the surfboard. For example, swimming pool / bathroom / skating rink flooring sheets, pool / bathroom / skating rink walling sheets, building floor sheets including stairs, vehicle floor mats, exercise equipment / toys (racquets, golf clubs, bicycles) Can be used as a grip sheet, an elderly care mat, and the like.

Various evaluation tests were conducted on the slip resistant sheet according to the present invention.
1. Sample preparation An anti-slip sheet test sample was prepared by the following procedure.

Example 1
First, the anti-slip sheet test sample was prepared using the manufacturing process shown in FIG. 6, and then the obtained anti-slip sheet was cut into a 60 cm long and 9 cm wide rectangle. did. As materials, linear low density polyethylene (LLDPE) was used for the base material layer, ethylene vinyl acetate copolymer resin (EVA) was used for the hard layer, and an acrylic pressure sensitive adhesive was used as the pressure sensitive adhesive layer. The thickness was 50 μm for the base material layer, 100 μm for the hard layer, and 50 μm for the adhesive layer. As a surface treatment method for chill rolls, 50 mesh mesh particles and 100 mesh alumina particles were blended at a ratio of 1: 1 and subjected to plast treatment. The nip pressure was 1.0 MPa. Detailed conditions are shown in Table 1a.

Example 2
A test sample was produced under the same conditions as in Example 1 except that the nip pressure was 0.4 MPa. Detailed conditions are shown in Table 1b.

Comparative Example 1
A test sample was produced under the same conditions as in Example 1 except that the nip pressure was 0.1 MPa. Detailed conditions are shown in Table 1c.

Comparative Example 2
A test sample was prepared under the same conditions as in Example 1 except that the surface treatment method of the chill roll was changed to 100 mesh alumina particles. Detailed conditions are shown in Table 1d.

Comparative Example 3
A test sample was prepared under the same conditions as in Example 1 except that the surface treatment method of the chill roll was changed to 50 mesh alumina particles. Detailed conditions are shown in Table 1e.

Comparative Example 4
A test sample was prepared under the same conditions as in Example 1 except that the surface treatment method of chill roll was blended with 30 and 50 mesh alumina particles at a ratio of 1: 1. Detailed conditions are shown in Table 1f.

2. Test Sample Evaluation Method (1) Evaluation of Pitch and Surface Roughness The pitch and surface roughness of samples were evaluated using the roughness meter function of a laser microscope apparatus (model VK9710) manufactured by Keyence Corporation.

As evaluation conditions, the wide area was set to 300 × 1200 μm, and the narrow area was set to 10 × 10 μm. The length of the line segment for pitch measurement was 1200 μm as the pitch of the concave portions of the first concave / convex pattern and 100 μm as the pitch of the concave portions of the second concave / convex pattern. The analysis performance of the apparatus is 768 pitches in the vertical direction and 1224 pitches in the horizontal direction. The number of tests (n) was 5, and the average value was taken as the measured value.
(2) Evaluation of surface hardness The surface hardness of the sample was evaluated using the roughness meter function of a surface hardness meter (model CL-150) manufactured by Asker. The number of tests (n) was 10, and the average value was taken as the measured value.
(3) A sample for sensory evaluation test was attached to the surface of a surf boat, and an attempt was made to evaluate the presence or absence and degree of anti-slip property of the test sample and the presence or degree of irritation to bare skin by a plurality of surfboard users.

  The criteria for evaluating the presence / absence or degree of anti-slip property were as follows: ○ that can be used in the same manner as wax, Δ that slips when subjected to severe action or strong stepping, and × that that cannot always be used due to unstable sliding. The number of tests (n) was 10, and the average value was taken as the measured value.

  The criteria for evaluating the presence / absence or degree of irritation are those that can withstand long-term use (for example, those that do not cause pain in the bare skin even after 8 hours), and those that can withstand use for a certain period of time. Δ (for example, the degree of pain that does not cause pain in the skin even after 4 hours), and x that can only withstand short-time use (for example, the degree that does not cause pain in the skin after 1 hour). did. The number of tests (n) was 10, and the average value was taken as the measured value.

3. Evaluation results The evaluation results of the present invention are shown in Table 2 together with comparative examples.

DESCRIPTION OF SYMBOLS 1, 2 Anti-slip sheet | seat concerning this invention 3 Anti-slip sheet | seat concerning a prior art example 10 Base material layer 11 The 1st main surface 12 of a base material layer The 2nd main surface 15 of a base material layer Embossed layer
20 Second concave / convex pattern 21 Second concave / convex pattern concave portion 22 Second concave / convex pattern pitch 30 First concave / convex pattern 31 First concave / convex pattern concave portion 34 Second concave / convex pattern concave depth (narrow region) The measured value of the surface roughness of the area is the maximum height (Rmax)
36 Concave depth of the first concavo-convex pattern (the measured value of the surface roughness of the wide area is the maximum height (Rmax))
50 Hard layer 60 Adhesive layer or pressure-sensitive adhesive layer 100 Surfboard 120 Anti-slip sheet material A consisting of a base material layer and a hard layer (no embossed layer on the base material surface)
122 Nip roll 123 Chill roll 124 T-die
126 Non-slip sheet material B consisting of a base material layer and a hard layer (there is an emboss layer on the base material surface)
130 Coating Machine 131 Drying Furnace 140 Winding Roll
200 Surfboard user's bare skin (foot)
300 water

Claims (4)

An anti-slip sheet comprising a base material having a first main surface and a second main surface on the opposite side of the first main surface, wherein the first main surface comprises the first concavo-convex pattern, It has an emboss shape composed of a second concavo-convex pattern arranged on the convex portion of the first concavo-convex pattern, the pitch of the concave portions of the first concavo-convex pattern is 50 μm or more and 200 μm or less, and the second concavo-convex pattern The pitch of the concave portions of the pattern is 20% or less of the pitch of the concave portions of the first concavo-convex pattern, and the maximum height (Rmax) of the surface roughness of the area including the first concavo-convex pattern and the second concavo-convex pattern is 25 μm. The maximum height (Rmax) of the surface roughness of the area including only the second concavo-convex pattern is not less than 50 μm and not more than 8 μm and not more than 15 μm, and the recesses of the first concavo-convex pattern constituting the embossed shape and the second Uneven pattern Slip resistant sheet communicating with each other and the concave portion. The anti-slip | skid sheet | seat of Claim 1 which has the surface hardness of the said base material in the range of 50-75 by a Shore A durometer value. The anti-slip device according to claim 1 or 2, wherein the base material has a hard sheet layer on the second main surface side, and the hard sheet layer has an adhesive layer on a surface opposite to the base material surface side. Sex sheet. A surfboard having the anti-slip sheet according to any one of claims 1 to 3.