JP2004351500A - Transverse perforation forming method for wound sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transverse perforation forming method which can avoid causing either an overall collapse into an oval shape or a projected kink on a wound sheet such as a tacky adhesive tape roll for example. <P>SOLUTION: The method comprises processes to successively form transverse perforations (2a) by a laser process on a wounded sheet (2) being wounded into a roll shape. The process changes the pitch of transverse perforation along the winding direction according to the thickness of the sheet. Specifically, the forming pitch of the transverse perforation is gradually increased by about twice of the sheet thickness (D) for every transverse perforation forming. Furthermore, a mark (2b) is printed on the side edge of the sheet corresponding to the forming position of the transverse perforation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a horizontal perforation of a wound sheet, and more particularly to a method for forming a horizontal perforation suitable for manufacturing an adhesive tape roll for an adhesive tape cleaner.
[0002]
[Prior art]
Conventionally, what is called an adhesive tape cleaner is known as a kind of cleaning tool. In the pressure-sensitive adhesive tape cleaner, a pressure-sensitive adhesive tape roll obtained by winding a pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on one surface in a roll shape is rotatably provided. Therefore, by simply rolling the adhesive tape roll along the surface such as the floor, dust can be easily removed by the adhesive action.
[0003]
In the adhesive tape roll, for example, a horizontal perforation is formed in a radial line shape (or at a position slightly shifted from the radial line position) along the radial direction of the core. Therefore, by cutting the adhesive tape along the horizontal perforation and peeling off the used surface for one roll, the unused surface for the next roll can be exposed on the surface of the adhesive tape roll (for example, (See Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-240821
[Problems to be solved by the invention]
In the prior art, a horizontal perforation is collectively formed on the pressure-sensitive adhesive tape roll by winding the pressure-sensitive adhesive tape into a roll and applying a sewing machine blade in the thickness direction to the obtained pressure-sensitive adhesive tape roll. Alternatively, the horizontal perforations are sequentially formed on the adhesive tape wound up in a roll shape using a sewing blade. As a result, in the conventional technology in which the horizontal perforations are collectively formed using the sewing blade, the adhesive tape roll is easily crushed into an oval shape due to the pressing force of the sewing blade, and the adhesive tape roll is not used when the adhesive tape cleaner is used. There was an inconvenience of being difficult to rotate.
[0006]
Further, in the conventional technology in which horizontal perforations are formed collectively or sequentially using a sewing blade, convex steps such as burrs and bulges are easily formed along the horizontal perforation when the sewing blade is pulled out. There is a disadvantage that the adhesive tape roll is difficult to rotate when the tape cleaner is used. Furthermore, the adhesive paste of the adhesive tape is easily attached to the sewing machine blade, and there is a disadvantage that the sewing machine blade needs to be frequently cleaned.
[0007]
The present invention has been made in view of the above-described problems. For example, an aspect in which a convex step is not formed on a winding sheet such as an adhesive tape roll without crushing the whole into an elliptical shape. It is an object of the present invention to provide a method capable of forming a horizontal perforation.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention includes a step of sequentially forming horizontal perforations by laser processing on a winding sheet wound in a roll shape,
In the step, a horizontal perforation forming method is provided, wherein the formation interval of the horizontal perforation along the winding direction is changed according to the thickness of the sheet.
[0009]
According to a preferred aspect of the present invention, the formation interval of the horizontal perforations is sequentially increased every time a horizontal perforation is formed by approximately twice the thickness of the sheet. Further, it is preferable that a mark mark is printed on a side edge portion of the sheet corresponding to the formation position of the horizontal perforation. Moreover, it is preferable that the said sheet | seat is an adhesive sheet in which one surface has adhesiveness. In this case, it is preferable that the adhesiveness is substantially reduced in a predetermined region near the formation position of the horizontal perforation.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a diagram schematically showing a configuration of an apparatus for performing a horizontal perforation forming method according to an embodiment of the present invention. Moreover, FIG. 2 is a figure which shows schematically a mode that a horizontal perforation and a mark mark are formed in order on an adhesive tape according to this embodiment. Moreover, FIG. 3 is a figure which shows schematically the structure of the adhesive tape roll finally obtained. In the present embodiment, the present invention is applied to a method of forming a horizontal perforation on an adhesive tape wound up in a roll shape.
[0011]
In the apparatus of FIG. 1, the continuous sheet-like adhesive tape 2 (see FIG. 2A) supplied from the supply unit 1 is wound around a cylindrical core 3 a of the winding unit 3 in a roll shape. The adhesive tape roll 4 is obtained. In the supply unit 1, the adhesive tape 2 is wound around a cylindrical drum 1a so that the adhesive layer faces outward. In addition, a digital printing unit 5 and a laser processing unit 6 are arranged in order from the supply unit 1 side on the conveyance path from the supply unit 1 to the winding unit 3.
[0012]
Here, the laser processing unit 6 includes, for example, a carbon dioxide (CO ₂ ) laser light source 6a, a condenser lens 6b for condensing a laser beam supplied from the carbon dioxide laser light source 6a, and a condenser lens 6b. A beam expander 6c for expanding the laser beam into a predetermined cross-sectional shape, and a laser beam shaped through the beam expander 6c is deflected toward the adhesive tape 2 and the width direction of the adhesive tape 2 (adhesive tape 2 And a galvano scanner 6d for scanning the laser beam along a direction orthogonal to the longitudinal direction (lateral direction).
[0013]
Both the digital printing unit 5 and the laser processing unit 6 are publicly known means whose configurations are generally known, and detailed description regarding the internal configuration is omitted. In the present embodiment, as shown in FIG. 2 (a), the laser processing unit 6 performs a horizontal perforation 2a (by laser processing) on the adhesive tape 2 wound around the core 3a of the winding unit 3 in a roll shape. 2aa, 2ab, 2ac,... Further, the digital printing unit 5 prints the mark mark 2b on both side edges of the adhesive tape 2 corresponding to the formation position of the horizontal perforation 2a.
[0014]
Here, the formation interval of the horizontal perforations 2a along the winding direction indicated by the arrow in the figure changes in accordance with the thickness D of the adhesive tape 2 (see FIG. 2B). Specifically, as shown in FIG. 2 (b), in order to form the horizontal perforations 2a and the mark marks 2b in a radial straight line without being displaced in the circumferential direction, the formation interval of the horizontal perforations 2a is set as an adhesive tape. Each time the horizontal perforation 2a is formed, the thickness is increased by 2D twice the thickness D of 2.
[0015]
That is, when forming the next horizontal perforation 2ac following the horizontal perforation 2ab formed at a distance L from the horizontal perforation 2aa, the distance (L + 2D) between the horizontal perforation 2ab and the horizontal perforation 2ac. Is secured. Thus, in the pressure-sensitive adhesive tape roll 4 finally obtained by winding the pressure-sensitive adhesive tape 2 supplied from the supply portion 1 around the core 3a of the winding portion 3 in a roll shape, as shown in FIG. A horizontal perforation 2a and a mark mark 2b are formed in a radial straight line along the radial direction.
[0016]
As described above, in the present embodiment, the formation interval of the horizontal perforations 2a is changed according to the thickness of the pressure-sensitive adhesive tape 2 with respect to the pressure-sensitive adhesive tape 2 wound around the core 3a of the winding unit 3 in a roll shape. Then, the horizontal perforations 2a are sequentially formed by laser processing. Therefore, in the present embodiment, unlike the prior art in which the horizontal perforation is formed by using the sewing blade, the core 3a is formed in a mode in which the whole is not crushed into an ellipse and a convex step is not formed. The horizontal perforation 2a can be formed in a radial straight line along the radial direction.
[0017]
As a result, when the pressure-sensitive adhesive tape roll 4 obtained according to the present embodiment is applied to, for example, a pressure-sensitive adhesive tape cleaner, the pressure-sensitive adhesive tape roll 4 easily rolls along a surface such as a floor, and the cleaning performance utilizing the pressure-sensitive action is improved. To do. Further, in the present embodiment, the mark mark 2b is printed on both side edges of the adhesive tape 2 corresponding to the formation position of the horizontal perforation 2a, so that it is affected by dust or the like attached to the surface of the adhesive tape roll 4. Even if it is difficult to see the horizontal perforation 2a, the adhesive tape 2 can be cut along the horizontal perforation 2a which can be easily found by relying on the mark 2b, and the used surface for one roll with reduced adhesiveness can be removed. Can be easily peeled off.
[0018]
By the way, a relatively thin and highly rigid adhesive tape is used for the conventional adhesive tape roll, but if the dust is large or the cleaning surface is rough, a sufficient adhesion surface cannot be obtained and the cleaning property is improved. It was easy to fall. In this embodiment, since the horizontal perforation is formed by laser processing, an appropriate adhesive tape made of thick paper or a soft material can be used, and as a result, the adhesion with the cleaning surface, that is, the cleaning property is improved. Can do.
[0019]
Moreover, when the conventional adhesive tape roll was rotated in the direction opposite to the required direction, the free end portion was easily turned by the adhesive action with the cleaning surface. In order to prevent the free end portion from being turned over, it is preferable to substantially reduce the adhesiveness in a predetermined region near the formation position of the horizontal perforation. That is, for example, at the same time as forming the horizontal perforations, it is preferable to half-cut the adhesive layer by laser irradiation (partially remove the surface) or to modify the surface to weaken the adhesive force.
[0020]
Specifically, for example, immediately after forming a horizontal perforation by the first scan that irradiates the adhesive tape with a beam having a relatively high light intensity, a beam having a relatively low light intensity is formed substantially parallel to the horizontal perforation. A method of performing a half cut process by a second scan to be irradiated is conceivable. In addition, a horizontal perforation is formed by the action of the center of the beam with the strongest light intensity in one scan in which the adhesive tape is irradiated with the laser beam in the multi-beam mode. A method of performing a half-cut process is conceivable.
[0021]
Further, for example, in a single scan in which the adhesive tape is irradiated with a laser beam via a bifocal lens using a diffraction pattern, a horizontal perforation is formed in a region corresponding to the first focal position by the action of a beam having a relatively strong light intensity. Can be considered, and a half-cut process is performed on the region corresponding to the second focal position by the action of a beam having a relatively weak light intensity. In addition, it is not limited to the above-mentioned three methods, A various modification is possible about the method of carrying out the surface modification for half-cutting an adhesive layer by laser irradiation, or weakening adhesive force.
[0022]
In the above-described embodiment, the horizontal perforations 2a are formed in a radial line shape along the radial direction of the core 3a. However, the present invention is not limited to this. Lateral perforations can also be formed sequentially at shifted positions. In the above-described embodiment, the horizontal perforation 2a extending in a straight line is formed. However, the present invention is not limited to this, and for example, a horizontal perforation extending in a wavy line can be formed. The horizontal perforation 2a may be a normal through-type or a half-cut type as necessary.
[0023]
In the above-described embodiment, the mark mark 2b is printed on both side edges of the adhesive tape 2 corresponding to the formation position of the horizontal perforation 2a. However, the present invention is not limited to this. The mark mark 2b can also be printed on the side edge. In the above-described embodiment, the present invention is applied to the method of forming the horizontal perforation on the pressure-sensitive adhesive tape wound in a roll shape. However, the present invention is not limited to this, and the roll is generally wound in a roll shape. The present invention can also be applied to a method of forming a horizontal perforation in a wound sheet to be formed.
[0024]
【The invention's effect】
As described above, in the horizontal perforation forming method of the present invention, for example, an aspect in which a convex step is not formed without crushing the whole into an elliptical shape with respect to a wound sheet such as an adhesive tape roll. Lateral perforations can be formed. Therefore, when the pressure-sensitive adhesive tape roll obtained according to the present invention is applied to, for example, a pressure-sensitive adhesive tape cleaner, the pressure-sensitive adhesive tape roll easily rolls along the surface of a floor or the like, and the cleanability utilizing the pressure-sensitive action is improved.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a configuration of an apparatus for performing a horizontal perforation forming method according to an embodiment of the present invention.
FIG. 2 is a diagram schematically showing a state in which horizontal perforations and mark marks are sequentially formed on the adhesive tape according to the present embodiment.
FIG. 3 is a diagram schematically showing a configuration of an adhesive tape roll finally obtained.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Supply part 2 Adhesive tape 2a Horizontal perforation 2b Mark mark 3 Winding part 4 Adhesive tape roll 5 Digital printing part 6 Laser processing part

Claims (5)

Including sequentially forming transverse perforations by laser processing on a winding sheet wound in a roll,
In the step, the horizontal perforation forming method is characterized in that the formation interval of the horizontal perforation along the winding direction is changed according to the thickness of the sheet. The horizontal perforation forming method according to claim 1, wherein the formation interval of the horizontal perforations is sequentially increased every time a horizontal perforation is formed by approximately twice the thickness of the sheet. The horizontal perforation forming method according to claim 1, wherein a mark mark is printed on a side edge portion of the sheet corresponding to the formation position of the horizontal perforation. The horizontal perforation forming method according to any one of claims 1 to 3, wherein the sheet is an adhesive sheet having one surface having adhesiveness. The horizontal perforation forming method according to claim 4, wherein the adhesiveness is substantially reduced in a predetermined region near the formation position of the horizontal perforation.

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