JP2009023306A - Method and device for manufacturing releasing paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method capable of manufacturing a releasing paper capable of transferring pattern having high contrast with high productivity. <P>SOLUTION: The manufacturing method is a method which forms irregularity pattern 12 on a raw film 20 to manufacture the releasing paper 10. The manufacturing method comprises a step of forming finer irregularity 16 than the irregularity of the irregularity pattern on the surface 20a of the raw film by blasting processing, and a step of forming the irregularity pattern of the raw film having a fine irregularity formed by embossing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a production method for producing a release paper by forming a concavo-convex pattern on an original fabric, and more particularly to a production method for producing a release paper capable of transferring a pattern having excellent contrast. The present invention also relates to a manufacturing apparatus for manufacturing a release paper by forming a concavo-convex pattern on an original fabric, and particularly to a manufacturing apparatus for manufacturing a release paper capable of transferring a pattern having excellent contrast.

Sheet-like materials used for synthetic leather products, decorative sheets, interior materials and the like can be manufactured by transferring a concavo-convex pattern formed on a release paper using the release paper as a pattern paper. The release paper can be generally produced by embossing an original fabric (for example, Patent Document 1).
JP 2002-205311 A

  By the way, when producing release paper by embossing, since a big pressure is easy to be applied during embossing, the recessed part of release paper can be formed accurately. On the other hand, since the processing pressure tends to be relatively small, it is difficult to accurately form the convex portion of the release paper. Therefore, there is a limit to increasing the gap between the concave portion and the convex portion on the release paper. As a result, there arises a problem that the contrast (brightness difference) of the sheet-like material produced using the release paper is not sufficient, that is, the pattern of the sheet-like material is flattened and visually recognized.

  Also, by increasing the processing pressure, the gap between the concave and convex portions on the release paper can be somewhat increased. However, when the processing pressure is increased, the production efficiency is deteriorated, and the load on the processing apparatus and the raw material is also increased.

  The present invention has been made in consideration of such points, and is a manufacturing method for manufacturing a release paper by forming a concavo-convex pattern on an original fabric, and is a release paper that can transfer a pattern having excellent contrast An object of the present invention is to provide a production method capable of producing a product with high production efficiency. Furthermore, the present invention is an apparatus for manufacturing a release paper for transferring a concavo-convex pattern to a raw fabric, and an apparatus for manufacturing a release paper capable of manufacturing a release paper capable of transferring a pattern having excellent contrast with high production efficiency. The purpose is to provide.

  By the way, in recent years, in order to manufacture a release paper (typically, a release paper that can withstand severe use conditions) according to a special application, a base material, a resin layer bonded on the base material, An original fabric having s may be used. Such an original fabric is usually produced by coating a resin on a substrate, and the resin layer becomes glossy. And when a sheet-like material is produced with the release paper obtained using such an original fabric, the above-mentioned problem that the contrast of the sheet-like material is insufficient tends to appear remarkably. It would be advantageous if a release paper capable of transferring a pattern having excellent contrast could be manufactured from such an original fabric by the release paper manufacturing method and the release paper manufacturing apparatus according to the present invention.

  A method for producing a release paper according to the present invention is a method for producing a release paper by forming a concavo-convex pattern on a raw fabric, and a concavo-convex microscopic unevenness on the surface of the original fabric by blasting. And a step of forming the concavo-convex pattern on the surface of the original fabric on which fine irregularities are formed by embossing.

  In the release paper manufacturing method according to the present invention, in the blasting process, silica sand or metal pieces having an average particle size of 0.1 μm or more and 150 μm or less may be sprayed on the original fabric.

  Further, in the release paper manufacturing method according to the present invention, after the step of forming the fine unevenness and before the step of forming the uneven pattern, the abrasive blown off by the blasting is applied to the original fabric. You may make it further provide the process of removing from the said surface.

  Further, in the step of forming the minute unevenness of the method for producing a release paper according to the present invention, the gloss value on the surface of the original fabric is the gloss value on the surface of the embossing mold used in embossing. Preferably, the blasting may be performed so that at least the glossiness value on the surface of the convex portion of the embossed uneven portion is smaller.

  Furthermore, in the step of forming the minute unevenness of the method for producing a release paper according to the present invention, blasting may be performed so that the glossiness of the surface of the original fabric is 4 or more and 8 or less. . In the step of forming the minute irregularities of the method for producing a release paper, the average length Sm of the original fabric on the surface is 30 μm or more and 80 μm or less, and the ten-point average roughness on the surface of the original fabric is Blasting may be performed so that the thickness Rz is 5 μm or more and 20 μm or less.

  Furthermore, in the step of forming the fine unevenness of the method for producing a release paper according to the present invention, the fine unevenness is formed in a region of the surface of the raw fabric where the uneven pattern is to be formed. May be.

  Furthermore, in the method for producing release paper according to the present invention, the original fabric has a base material and a synthetic resin layer laminated on the base material, and the synthetic resin layer is formed with the minute irregularities. The surface may be formed.

  Furthermore, in the step of forming the concavo-convex pattern of the method for producing a release paper according to the present invention, the concavo-convex while leaving the minute concavo-convex formed on the surface of the original fabric that is positioned on the convex portion of the concavo-convex pattern You may make it the fine unevenness | corrugation formed in the surface of the said original fabric which comes to be located in the recessed part of a pattern level.

  A release paper manufacturing apparatus according to the present invention is a manufacturing apparatus for manufacturing a release paper by forming a concavo-convex pattern on an original fabric, and sprays an abrasive on the surface of the original fabric so that the surface is more than the concavo-convex pattern. A blasting device for forming minute irregularities, and an embossing device that is disposed on the downstream side of the blasting device and forms the irregularity pattern on the original fabric, are provided.

  In the release paper manufacturing apparatus according to the present invention, the blasting apparatus may spray silica sand or metal pieces having an average particle diameter of 0.1 μm or more and 150 μm or less onto the surface of the original fabric as an abrasive.

  Further, the release paper manufacturing apparatus according to the present invention removes the abrasive blown from the blasting device from the surface of the original fabric on the downstream side of the blasting device and upstream of the embossing device. You may make it further provide an apparatus.

  Furthermore, in the release paper manufacturing apparatus according to the present invention, the embossing device includes an embossing die that includes an uneven portion corresponding to the uneven pattern and comes into contact with the original fabric, and the blast device However, the gloss value of the surface of the original fabric is smaller than the gloss value of the embossed uneven portion, preferably at least the gloss value of the surface of the embossed uneven portion. As described above, minute irregularities may be formed on the surface of the original fabric.

  Further, in the release paper manufacturing apparatus according to the present invention, the blasting device forms minute irregularities on the surface of the original fabric so that the glossiness of the original fabric is 4 or more and 8 or less. You may do it. In such a release paper manufacturing apparatus, the blasting device has an average length Sm of the original fabric on the surface of 30 μm or more and 80 μm or less, and a ten-point average roughness Rz on the surface of the original fabric of 5 μm. You may make it form a micro unevenness | corrugation in the said surface of the said original fabric so that it may become 20 micrometers or less above.

  Furthermore, in the release paper manufacturing apparatus according to the present invention, the blasting device forms minute irregularities in a region of the surface of the original fabric where the irregularities are to be formed by the embossing device. May be.

  Furthermore, in the release paper manufacturing apparatus according to the present invention, the original fabric has a synthetic resin layer forming a surface and a base material laminated on the synthetic resin layer, and the blasting device is provided on the synthetic resin layer. The embossing device is arranged so as to form minute unevenness, and the embossing device may have an embossing type including an unevenness portion corresponding to the unevenness pattern and coming into contact with the synthetic resin layer. .

  Further, in the release paper manufacturing apparatus according to the present invention, the embossing device is disposed opposite to the embossing die having an uneven portion corresponding to the uneven pattern and the embossing die. A back-up body that presses against the back, and the convex portions of the concavo-convex portion of the embossed type press the original fabric between the back-up body and smooth the surface of the original fabric. May be.

  According to the present invention, a release paper capable of transferring a pattern having excellent contrast can be manufactured with high production efficiency.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 6 are views for explaining an embodiment of a release paper manufacturing method and a release paper manufacturing apparatus according to the present invention. Among these, FIG. 1 is a perspective view showing a release paper manufacturing apparatus and a release paper manufacturing method, and FIG. 2 is a cross-sectional view showing an example of a raw material used for the release paper manufacturing. FIGS. FIG. 5 is a diagram for explaining a method for producing a release paper, FIG. 5 is a cross-sectional view showing the release paper, and FIG. 6 shows the action of a sheet-like member produced using the release paper shown in FIG. It is a figure for demonstrating.

  First, the release paper that can be manufactured in the present embodiment will be described mainly with reference to FIG. As shown in FIG. 5, the release paper 10 includes an original fabric 20 in which a concavo-convex pattern 12 having a concave portion 12 b and a convex portion 12 a is formed on one surface 20 a.

  Further, on the convex portion 12 a of the concavo-convex pattern 12, a fine concavo-convex (also referred to as a fine concavo-convex shape) 16 than the concavo-convex pattern 12 is formed. On the other hand, the bottom surface of the recess 12b of the concavo-convex pattern 12 is formed as a flat surface.

  Such release paper 10 is used as a paper pattern for producing a sheet-like member 30 such as vinyl leather or wallpaper. Specifically, the uneven surface side of the release paper 10 is coated with a paint made of a thermosetting resin or the like, and the base fabric 38 is further laminated. Thereafter, the paint is cured to form a paint layer 37 made of paint, and then the release paper 10 is peeled from the paint layer 37 to obtain the sheet-like member 30 having the base cloth 38 and the paint layer 37. be able to. The concavo-convex pattern 12 and the minute concavo-convex shape 16 of the release paper 10 are transferred to the paint layer 37 of the obtained sheet-like member 30, and the design of the sheet-like member 30 is improved by the transferred concavo-convex pattern 32. ing. In addition, the release paper 10 is used repeatedly and the several sheet-like member 30 can be produced.

  In this Embodiment, the release paper 10 functions as a paper pattern for producing the sheet-like member 30 used as a synthetic leather. In this case, the paint layer 37 of the sheet-like member 30 can be formed by, for example, a paint obtained by blending a polyurethane resin with a colorant. Moreover, in this Embodiment, the release paper 10 has the base material 24 which consists of paper etc., and the synthetic resin layer 22 which is laminated | stacked on the base material 24 and consists of a synthetic resin. As shown in FIG. 5, the concavo-convex pattern 12 and the fine concavo-convex shape 16 are formed from the surface of the release paper 10 on the synthetic resin layer 22 side.

  Next, the operation of the release paper 10 having such a configuration will be described.

  As described above, in such a release paper 10, the minute uneven shape 16 is formed on the convex portion 12 a of the uneven pattern 12. Therefore, when the release paper 10 is used as a pattern paper, as shown in FIG. 6, the release paper 10 is separated into the recesses 32b of the pattern 32 of the sheet-like member 30 formed by transferring the projections 12a of the uneven pattern 12 of the release paper 10. A minute unevenness 36 formed by transferring the minute uneven shape 16 of the pattern paper 10 is formed. For this reason, as shown in FIG. 6, the light L66 incident on the concave portion 32b of the sheet-like member 30 is diffusely reflected and scattered, and the reflected light L67 from the concave portion 32b is visible only with a very small amount of light. It becomes like this.

  On the other hand, as described above, the concave portion 12b of the concavo-convex pattern 12 is formed as a flat surface. Therefore, when this release paper 10 is used as a pattern paper, as shown in FIG. 6, the upper surface of the convex portion 32a of the pattern 32 of the sheet-like member 30 formed by transferring the concave portion 12b of the concave and convex pattern 12 of the release paper 10 is It is formed as a flat surface. For this reason, as shown in FIG. 6, the light L61 incident on the convex portion 32a of the sheet-like member 30 is regularly reflected, and the reflected light L62 from the convex portion 32a is clearly visually recognized.

  As a result, the transferred pattern 32 of the sheet-like member 30 has an extremely high contrast between the convex portion 32a and the concave portion 32b, and the gloss on the convex portion 32a. That is, according to the release paper 10 according to the present embodiment, a pattern having excellent gloss and contrast can be transferred.

  Next, an embodiment of a release paper manufacturing method and a release paper manufacturing apparatus according to the present invention capable of producing the release paper described above will be described mainly with reference to FIGS.

  As shown in FIGS. 1 to 4, the manufacturing apparatus 40 includes a blasting device 41 that blows an abrasive 42 onto one surface 20 a of the raw fabric 20 to form minute irregularities 16 on the surface 20 a, and a blasting device 41. And an embossing device 51 that forms the concavo-convex pattern 12 on the original fabric 20. In addition, the manufacturing apparatus 40 includes an original fabric supply apparatus (not shown) that continuously supplies the original fabric 20 that is not embossed and extends in a belt shape, and a separation pattern formed by forming the uneven pattern 12 on the original fabric 20. A release paper collecting device (not shown) that winds up and collects the pattern paper 10 is further provided.

  The blast device 41 is connected to a compressed gas source (not shown) and an abrasive container, and discharges the abrasive 42 supplied from the abrasive container together with the compressed gas (for example, air) supplied from the compressed gas source. It has become. As the abrasive 42, various known abrasives can be used. For example, silica sand or metal pieces can be used as the abrasive 42. Further, as well shown in FIGS. 1 and 3, a first backup body 46 is provided to face the blast device 41. The first backup body 46 supports the raw fabric 20 to which the compressed gas and the abrasive 42 are blown from below. In the present embodiment, the first backup body 46 is configured as a first backup roll 47 that can rotate in synchronization with the moving speed of the original fabric 20.

  By the way, it is effective to roughen the original fabric 20 by the blasting device 41 so that the glossiness on one surface 20a of the original fabric 20 is 4 or more and 8 or less. When the inventor conducted various experiments, when the roughened surface 20a of the raw fabric 20 has a glossiness within this range, the finally obtained sheet-like member 30 effectively exhibits the above-described effects. The knowledge that it is possible to perform is obtained. The “glossiness” in this case is a glossiness measured in accordance with JIS 6007.

  Further, as a result of investigation by the present inventors, in order to obtain a glossiness of 4 or more and 8 or less on one surface 20a of the original fabric 20, the average of the surface 20a of the original fabric 20 on which minute irregularities are formed by blasting. It is effective to perform blasting so that the length Sm is 30 μm or more and 80 μm or less, and the ten-point average roughness Rz of the surface 20a of the raw fabric 20 on which minute irregularities are formed by blasting is 5 μm or more and 20 μm or less. The knowledge that there is. Here, “average length Sm” and “ten-point average roughness Rz” are values measured in accordance with JISB0401.

  In the present embodiment, the average length Sm and the ten-point average roughness Rz on the surface 20a of the original fabric 20 are discharged from the blast device 41 so as to be values within desired ranges, respectively. The type, particle size, etc. of the abrasive 42 are set appropriately. As a specific example, silica sand or metal pieces having an average particle diameter of 0.1 μm or more and 150 μm or less, more preferably silica sand or metal pieces having an average particle diameter of 30 μm or more and 80 μm or less can be used as the abrasive 42.

  Next, the embossing device 51 will be described. As well shown in FIG. 1, the embossing device 51 is disposed so as to face the embossing mold 52, an embossing mold 52 having a concavo-convex portion 54 corresponding to the concavo-convex pattern 12 to be formed on the raw fabric 20, and And a second backup body 56 that presses the original fabric 20 with the embossing mold 52. In the present embodiment, the embossing mold 52 is configured as a roll-shaped embossing roll. The embossing roll 52 has a roll body 53 that is rotationally driven, and an uneven portion 54 is formed on the outer peripheral surface of the roll body 53. In this Embodiment, the uneven | corrugated | grooved part 54 is formed so that a leather pattern can be provided to the surface 20a of the raw fabric 20 so that the release paper 10 for synthetic leather can be produced.

  Moreover, in this Embodiment, the 2nd backup body 56 is arrange | positioned facing the embossing roll 52, and is comprised as the 2nd backup roll 57 which can be rotated synchronizing with the moving speed of the raw fabric 20. As shown in FIG. The second backup roll 57 sandwiches the original fabric 20 with the embossing roll 52.

  The embossing device 51 is further connected to a roll body 53 of the embossing roll 52 and further includes a drive mechanism (not shown) that rotationally drives the roll body 53. By this drive mechanism, the embossing roll 52 rotates in synchronization with the conveyance speed of the original fabric 20 to transfer the uneven pattern of the uneven portion 54 to the original fabric 20.

  As shown in FIG. 1, the embossing roll 52 and the second backup roll 57 are arranged on the downstream side of the blasting device 41 and the first backup roll 47. Therefore, the original fabric 20 supplied from the original fabric supply device first passes between the blast device 41 and the first backup roll 47 and then passes between the embossing roll 52 and the second backup roll 57. It becomes like this.

  Further, as shown in FIG. 1, between the blasting device 41 and the embossing device 51 along the conveyance path of the raw fabric 20, that is, on the downstream side of the blasting device 41 and on the upstream side of the embossing device 51. A removing device 58 for removing the abrasive 42 blown off from the blasting device 41 and remaining on the surface 20a of the original fabric 20 from the surface 20a of the original fabric 20 is provided. In the present embodiment, the removing device 58 has a rotatable cleaning roll 59. The cleaning roll 59 can collect foreign matters such as the abrasive 42 remaining on the raw fabric 20 by bringing the outer peripheral surface thereof into contact with the surface 20 a of the original fabric 20. As such a cleaning roll 59, for example, a urethane cleaning roller of Kyowa Giken Co., Ltd. can be used.

  In the present embodiment, the original fabric 20 supplied from the original fabric supply apparatus includes the base material 24 made of paper and the synthetic resin layer 22 laminated on the base material 24 as described above. (See FIG. 2). Such an original fabric 20 can be manufactured, for example, by blending a desired synthetic resin with a solvent and coating the base material 24. In this case, the synthetic resin layer 22 of the raw fabric 20 extends flatly on the base material 24 and has an excellent gloss. In the raw fabric 20 manufactured by such a manufacturing method, the synthetic resin layer 22 usually has a glossiness of at least 10 or more.

  The synthetic resin layer 22 forms a surface 20 a on one side of the raw fabric 20. The resin contained in the synthetic resin layer 22 is variously selected according to the requirements for the release paper 10 to be manufactured, such as polypropylene. In addition, the base material 24 restrains the deformation of the synthetic resin layer 22 to promote plastic deformation of the synthetic resin layer 22 during embossing, that is, transfer of the uneven pattern, and the synthetic resin layer 22 by embossing. It is provided for the purpose of preventing the irregularities 12 and 16 formed in the above from being damaged during subsequent handling. As shown in FIG. 1, the blasting device 41 is disposed so as to face the synthetic resin layer 22 of the raw fabric 20 through which the discharge port 41a for discharging the abrasive 42 together with the compressed gas is conveyed. Further, the embossing roll 52 of the embossing device 51 and the cleaning roll 59 of the removing device 58 are arranged so as to contact the synthetic resin layer 22 of the raw fabric 20.

  Next, a method for manufacturing the release paper 10 using the manufacturing apparatus 40 having such a configuration will be described.

  First, the relative position between the blasting device 41 and the first backup roll 47 is adjusted so that the original fabric 20 supported on the first backup roll 47 can be appropriately blasted. In addition, the embossing roll 52 and the second backup roll 57 can be embossed appropriately, and the embossing roll 52 and the second backup roll can be supported appropriately. The relative position with respect to the roll 57 is adjusted. Further, the position of the cleaning roll 59 of the removing device 58 with respect to the blasting device 41 and the embossing device 51 so that the abrasive 42 remaining on the raw material 20 can be removed before the raw material 20 is fed into the embossing device 51. Adjust. Thereafter, the original fabric 20 is supplied from the original fabric supply apparatus.

  The original fabric 20 supplied from the original supply device is first fed between the blast device 41 and the first backup body 46 and supported on the first backup roll 47. At this time, as shown in FIG. 3, the synthetic resin layer 22 of the original fabric 20 faces the discharge port 41 a of the blast apparatus 41, and the base material 24 of the original fabric 20 faces the first backup roll 47. The blast device 41 discharges an abrasive 42, for example, silica sand or metal pieces (more preferably, silica sand or metal pieces having an average particle size of 30 μm or more and 80 μm or less) of 0.1 μm or more and 150 μm or less together with a compressed gas from its discharge port 41a. To do. The discharged abrasive 42 is sprayed on the surface 20 a on one side of the raw fabric 20. Thereby, one surface 20a of the raw fabric 20 is blasted.

  In addition, as mentioned above, it is preferable that the raw fabric 20 is roughened by blasting so that the glossiness based on JIS S6007 on the surface 20a of the raw fabric 20 is 4 or more and 8 or less. Further, by managing the average length Sm and the ten-point average roughness Rz of the surface 20a of the original fabric 20 on which the minute irregularities 16 are formed by blasting, the original fabric 20 has a glossiness in such a range. Can have. Specifically, the average length Sm based on JISB0601 on the surface 20a of the original fabric 20 is 30 μm or more and 80 μm or less, and the ten-point average roughness Rz based on JISB0601 on the surface 20a of the original fabric 20 is 5 μm or more and 20 μm or less. As described above, blasting the raw fabric 20 is effective in obtaining the glossiness within the above-described range.

  Further, in the present embodiment, as shown in FIG. 1, the entire surface 20a on one side of the original fabric 20 is roughened by blasting, and the micro uneven shape 16 is formed on the entire surface 20a of the original fabric 20. (Matized).

  The original fabric 20 on which the minute uneven shape 16 is formed is then conveyed to the removing device 58. As shown in FIG. 1, one surface 20 a of the original fabric 20 comes into contact with the cleaning roll 59 of the removing device 58. The cleaning roll 59 collects the abrasive 42 remaining on the one surface 20 a of the original fabric 20. The original fabric 20 from which the abrasive 42 has been collected is then conveyed to the embossing device 51.

  As shown in FIG. 4, the original fabric 20 is fed between the embossing roll 52 and the second backup roll 57 of the embossing device 51, and is sandwiched between the embossing roll 52 and the second backup roll 57. As shown in FIG. 4, the synthetic resin layer 22 of the original fabric 20 faces the embossing roll 52 of the embossing device 51, and the base material 24 of the original fabric 20 faces the second backup roll 57. As a result, an uneven pattern (skin pattern) 12 corresponding to the shape of the uneven portion 54 of the embossing roll 52 is formed on the surface of the synthetic resin layer 22 of the raw fabric 20.

  By the way, when forming the concavo-convex pattern 12, a large processing pressure is applied to the region where the concave portion 12b of the concavo-convex pattern 12 is formed. That is, the convex part 54a of the uneven part 54 of the embossing roll 52 presses the raw fabric 20 with a large pressure. In general, the concavo-convex portion 54 of the embossed mold (embossed plate) 52 is formed smoothly, and the glossiness of the concavo-convex portion 54 (for example, the convex portion 54a) in accordance with JIS S6007 is usually greater than at least 8. In many cases, it is 15 or more. Therefore, as shown in FIG. 4, the minute uneven shape 16 that has been formed on the surface of the original fabric 20 where the recess 12b of the uneven pattern 12 is to be formed becomes gentle when pressed. That is, the glossiness on the surface of the raw fabric 20 where the concave portion 12b of the concave / convex pattern 12 is formed increases. In the present embodiment, the bottom surface of the concave portion 12b of the concave-convex pattern 12 on the raw fabric 20 is further flattened.

  In particular, as described above, the average length Sm of the surface 20a of the raw fabric 20 on which the fine uneven shape 16 is formed by blasting is 30 μm or more and the ten-point average roughness Rz of the surface 20a is 20 μm or less. When the glossiness of the surface 20a of the raw fabric 20 roughened by blasting is 4 or more, the concave portion 12b of the concave-convex pattern 12 on the raw fabric 20 can be sufficiently smoothed, The upper surface of the convex part 32a of the sheet-like member 30 manufactured using this original fabric 20 (release paper 10) can be made sufficiently glossy.

  On the other hand, when the concavo-convex pattern 12 is formed, only a relatively small processing pressure is applied to a region where the convex portion 12a of the concavo-convex pattern 12 is formed. Therefore, the minute unevenness 16 that comes to be located on the convex portion 12a of the uneven pattern 12 can be left as it is (see FIG. 4) or in a slightly gentle state. In particular, the depth (gap) of the concave portion 54b of the concave-convex portion 54 of the embossing roll 52 is set deep, specifically, as shown in FIG. 4, the height of the convex portion 12a of the concave-convex pattern 12 to be formed. By setting the depth deeper than the value, the minute unevenness 16 positioned on the convex portion 12a of the uneven pattern 12 can be left as it is without being crushed.

  In particular, as described above, the average length Sm of the surface 20a of the raw fabric 20 on which the fine uneven shape 16 is formed by blasting is 80 μm or less and the ten-point average roughness Rz of the surface 20a is 5 μm or more, When the glossiness of the surface 20a of the original fabric 20 roughened by blasting is 8 or less, an effective minute irregular shape 16 can be left on the convex portion 12a of the irregular pattern 12 on the original fabric 20. Thus, it is possible to sufficiently scatter the light incident on the concave portion 32b of the sheet-like member 30 manufactured using the original fabric 20 (release paper 10).

  In this way, the release paper 10 having the raw fabric 20 on the surface of which the rough concavo-convex pattern 12 having the concave portion 12b and the convex portion 12a is formed, and the minute concavo-convex shape 16 is formed on the convex portion 12a. Thus, the release paper 10 in which the inside of the recess 12b is smoothed can be manufactured. The manufactured release paper 10 is taken up by a collecting device (not shown).

  As described above, according to the present embodiment, first, the polishing agent 42 is sprayed onto the original fabric 20 by the blasting device 41, so that one surface 20a of the original fabric 20 is blasted, and the surface 20a has a minute amount. Concavities and convexities 16 are formed. Thereby, even if the glossiness of the surface 20a on which the concavo-convex pattern 12 of the raw fabric 20 is to be formed initially has a large value, the glossiness of the embossed type (embossed plate) 52 is reduced to a predetermined value or less. It can be reduced to a value smaller than the glossiness of the uneven portion (uneven surface, transfer surface) 54. After that, the embossing roll 52 of the embossing device 51 forms an uneven pattern 12 that is coarser than the fine unevenness 16 on one surface 20a of the raw fabric 20. When the concave / convex pattern 12 is formed, a large processing pressure is applied to the region where the concave portion 12b of the concave / convex pattern 12 is formed, while the region where the convex portion 12a of the concave / convex pattern 12 is formed is relatively small. Only processing pressure is applied. Therefore, the minute unevenness 16 that comes to be positioned on the convex portion 12a of the uneven pattern 12 can be left as it is or slightly gently. At the same time, the minute unevenness 16 that comes to be positioned on the recess 12b of the uneven pattern 12 can be made gentle. As a result, when the sheet-like member 30 is produced using the release paper 10 as a pattern paper, the surface of the convex portion 32a of the pattern 32 transferred to the sheet-like member 30 becomes smooth and has excellent gloss. On the other hand, minute irregularities 36 are formed on the bottom surface of the concave portion 32 b of the pattern 32 transferred to the sheet-like member 30. Thereby, the pattern 32 transferred to the sheet-like member 30 has a high contrast between the convex part 32a and the concave part 32b of the pattern 32, and has an excellent gloss on the convex part 32a. That is, according to the present embodiment, the pattern 32 having excellent gloss and contrast can be transferred to the sheet-like member 30. Further, according to the present embodiment, a sheet-like member is formed not by the gap between the concave portion 12b and the convex portion 12a of the concave / convex pattern 12 of the release paper 10 but by the minute concave / convex portions 16 remaining on the convex portion 12a of the concave / convex pattern 12. The contrast of the pattern 32 transferred to 30 is increased. Therefore, it is not necessary to apply a high processing pressure to the raw fabric 20 during the production of the release paper 10. Thereby, while being able to manufacture the release paper 10 with high production efficiency, the damage to the raw fabric 20, especially the base material 24, can be reduced. Moreover, the manufacturing cost and maintenance cost of the manufacturing apparatus 40 can be reduced. Furthermore, according to the present embodiment, the release paper that can transfer the pattern 32 having excellent gloss and contrast to the sheet-like member 30 irrespective of the degree of gloss that the original fabric 20 originally has. Can be manufactured stably.

  Further, according to the present embodiment, the surface 20 a of the raw fabric 20 is roughened by blasting using the blasting device 41. Therefore, the minute irregularities 16 can be formed on the surface 20a of the original fabric 20 easily and quickly.

  Furthermore, according to the present embodiment, the bottom surface of the recess 12b of the concavo-convex pattern 12 is flattened. According to such a release paper, a pattern having extremely excellent gloss can be transferred to the sheet-like member 30.

  Further, in the step of forming the concavo-convex pattern 12, the minute concavo-convex 16 is formed in the entire region where the concavo-convex pattern 12 of the original fabric 20 is formed. According to this embodiment, it is not necessary to strictly align the arrangement position of the minute unevenness 16 on the original fabric 20 and the uneven pattern 12 on the original fabric 20. Further, the unnecessary minute irregularities 16 formed on the raw fabric 20 are made gentle during the formation of the irregular pattern 12. Therefore, the release paper 10 in which the minute irregularities 16 exist only at the desired position can be manufactured with high production efficiency.

  Various modifications can be made to the above-described embodiment within the scope of the present invention.

  For example, in the above-described embodiment, an example in which the release paper 10 for synthetic leather is manufactured has been shown. However, the present invention is not limited to this, and a release paper (for example, a release paper for wallpaper) used for other purposes is manufactured. You may make it do.

  Further, in the above-described embodiment, the example in which the entire surface 20a on the synthetic resin layer 22 side of the raw fabric 20 is roughened by blasting is shown. However, the present invention is not limited to this. Only the region where 12 is formed or only the region where the convex portion 12a of the concavo-convex pattern 12 on the raw fabric 20 is formed may be roughened by blasting.

  Furthermore, in the above-described embodiment, the example in which the first backup body 46 is configured as the first backup roll 47 has been described. However, the present invention is not limited to this, and the raw material to which the abrasive 42 is blown together with the compressed gas from the blast device 41 is shown. A known device that can stably support the substrate 20, such as a cradle, can be used as the first backup body 46.

  Furthermore, although the example which the embossing apparatus 51 has the embossing roll 52 was shown in embodiment mentioned above, it is not restricted to this, Various known embossing apparatuses can be employ | adopted. For example, a press device that presses a belt type or flat plate type embossing die against the workpiece can be employed as the embossing device.

  Furthermore, in the above-described embodiment, the example in which the outer peripheral surface of the second backup roll 57 of the second backup body 56 is formed in a flat curved surface without unevenness is shown, but the present invention is not limited to this. You may make it have the unevenness | corrugation corresponding to the uneven | corrugated | grooved part 54. FIG.

  Furthermore, in the above-described embodiment, the example in which the second backup body 56 is configured as the second backup roll 57 has been described. However, the embodiment is not limited thereto, and the raw fabric 20 is stably supported with the embossing mold 52. A known device that can be used, such as a cradle, can be employed as the second backup body 56.

  Furthermore, in the above-described embodiment, the example in which the removing device 58 has the cleaning roll 59 has been shown. Can be used. For example, an air blowing device may be provided instead of or in addition to the cleaning roll 59.

FIG. 1 is a perspective view showing an embodiment of a release paper manufacturing apparatus and a manufacturing method according to the present invention. FIG. 2 is a cross-sectional view showing an example of an original fabric used for producing release paper. FIG. 3 is a view for explaining the release paper manufacturing apparatus and manufacturing method shown in FIG. FIG. 4 is a view for explaining a release paper manufacturing apparatus and a manufacturing method shown in FIG. FIG. 5 is a cross-sectional view showing an example of a release paper manufactured by the release paper manufacturing apparatus and manufacturing method shown in FIG. FIG. 6 is a diagram for explaining the operation of a sheet-like member produced using the release paper shown in FIG. 5 as a pattern paper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Release paper 12 Uneven pattern 12a Uneven pattern convex part 12b Uneven pattern concave part 16 Minute unevenness (micro uneven shape)
20 Raw fabric 22 Base material 24 Synthetic resin layer 40 Manufacturing device 41 Blasting device 42 Abrasive agent 46 Backup body 47 Backup roll 51 Embossing device 52 Embossing type (embossing roll, embossing plate)
54 Concavity and convexity 54a Concavity and convexity convex portion 54b Concavity and convexity concave portion 56 Backup body 57 Backup roll

Claims (18)

A method of producing a release paper by forming an uneven pattern on a raw fabric,
Forming a concavo-convex microscopically on the surface of the original fabric by blasting,
And a step of forming the concavo-convex pattern on the surface of the original fabric on which fine irregularities are formed by embossing. 2. The method for producing a release paper according to claim 1, wherein in the blasting process, silica sand or a metal piece having an average particle diameter of 0.1 μm or more and 150 μm or less is sprayed on the original fabric. After the step of forming the fine unevenness and before the step of forming the uneven pattern, the method further comprises the step of removing the abrasive blown off by the blasting from the surface of the original fabric. The method for producing a release paper according to claim 1 or 2, characterized in that: In the step of forming the minute unevenness, blasting is performed so that the gloss value on the surface of the original fabric is smaller than the gloss value on the surface of the embossing mold used in the embossing process. The method for producing a release paper according to any one of claims 1 to 3, wherein: 5. The blasting process is performed according to claim 1, wherein in the step of forming the minute unevenness, blasting is performed so that the glossiness of the surface of the original fabric is 4 or more and 8 or less. The manufacturing method of the release paper of description. In the step of forming the minute unevenness, the average length Sm of the surface of the original fabric is 30 μm or more and 80 μm or less, and the ten-point average roughness Rz of the surface of the original fabric is 5 μm or more and 20 μm or less. 6. A method for producing a release paper according to claim 5, wherein blasting is performed. 7. The step of forming the minute unevenness includes forming minute unevenness in a region of the surface of the original fabric where the uneven pattern is to be formed. A method for producing a release paper according to one item. The original fabric has a base material and a synthetic resin layer laminated on the base material,
The method for producing a release paper according to any one of claims 1 to 7, wherein the synthetic resin layer forms a surface on which the minute unevenness is formed. In the step of forming the concavo-convex pattern, the original that comes to be positioned in the concave portion of the concavo-convex pattern while leaving the minute concavo-convex formed on the surface of the original fabric that is positioned in the convex portion of the concavo-convex pattern The method for producing a release paper according to any one of claims 1 to 8, wherein minute irregularities formed on the opposite surface are smoothed. A manufacturing apparatus for producing a release paper by forming an uneven pattern on a raw fabric,
A blasting device for spraying an abrasive on the surface of the original fabric to form fine irregularities on the surface than the irregular pattern;
An apparatus for producing release paper, comprising: an embossing device that is disposed on the downstream side of the blasting device and forms the uneven pattern on the original fabric. 11. The release paper manufacturing apparatus according to claim 10, wherein the blasting apparatus sprays silica sand or metal pieces having an average particle diameter of 0.1 μm or more and 150 μm or less onto the surface of the raw fabric as an abrasive. 11. The apparatus further comprises a removing device that removes the abrasive blown from the blasting device from the surface of the raw fabric downstream of the blasting device and upstream of the embossing device. Alternatively, the release paper manufacturing apparatus according to 11. The embossing device has an embossing mold including an uneven portion corresponding to the uneven pattern and including an uneven portion that comes into contact with the original fabric,
The blasting device has minute unevenness on the surface of the original fabric so that the glossiness value on the surface of the original fabric is smaller than the glossiness value on the unevenness portion of the embossed type. 13. The release paper manufacturing apparatus according to claim 10, wherein the release paper manufacturing apparatus is formed. The blasting apparatus forms minute irregularities on the surface of the original fabric so that the glossiness on the surface of the original fabric is 4 or more and 8 or less. The release paper manufacturing apparatus according to claim 1. In the blasting apparatus, the original length Sm of the original fabric is 30 μm or more and 80 μm or less, and the ten-point average roughness Rz of the original fabric on the surface is 5 μm or more and 20 μm or less. 15. The release paper manufacturing apparatus according to claim 14, wherein minute irregularities are formed on the opposite surface. The blasting device forms minute unevenness in a region where the unevenness pattern is formed by the embossing device on the surface of the original fabric. The release paper manufacturing apparatus according to the item. The original fabric has a synthetic resin layer forming a surface, and a base material laminated on the synthetic resin layer,
The blasting device is arranged to form minute irregularities in the synthetic resin layer,
17. The embossing device according to claim 10, wherein the embossing device includes an embossing die that includes an uneven portion corresponding to the uneven pattern and comes into contact with the synthetic resin layer. The release paper manufacturing apparatus as described. The embossing device includes an embossing mold having a concavo-convex portion corresponding to the concavo-convex pattern, and a backup body that is disposed to face the embossing mold and presses the original fabric between the embossing mold. And
The convex portion of the concavo-convex portion of the embossed type presses the original fabric with the backup body to smooth the surface of the original fabric. The release paper manufacturing apparatus as described.

Images