JP2008201507A - Method of manufacturing sheet roll, sheet roll, and device for manufacturing sheet roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a sheet roll having no displacement of the end face thereof or abrasion flaw when even a sheet having comparatively low toughness is wound up in a rolled shape, costeffectively manufacturable, easily adjustable, and less inducing other defects; and to provide the sheet roll, and a device for manufacturing the sheet roll. <P>SOLUTION: An energy ray for providing energy to be absorbed by the sheet 3 is radiated to radiation portions 18 on both surfaces or one surface of the running sheet 3 at a predetermined position of the width direction of the sheet 3 having an elongation at break of ≥2% and ≤70% to deform the sheet 3 at the radiation portion 18 and/or the surrounding part. Subsequently, the sheet 3 is wound up in the rolled shape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sheet roll manufacturing method, a sheet roll, and a sheet roll manufacturing apparatus.

  Acrylic resin films are excellent in transparency, surface gloss and light resistance, so liquid crystal display sheets or films, optical materials such as light guide plates, vehicle interior materials and exterior materials, vending machine exterior materials, electrification It is used for the surface skin of products, interior materials for building materials, exterior materials, etc., and used in a wide range of fields such as protection of skins such as polycarbonate and vinyl chloride. However, since acrylic resin films generally have lower toughness than polyester films and polypropylene films, there is a problem that they are easily broken and easily broken during film formation and processing. In recent years, it is often used for a display sheet, and a sheet free from defects such as scratches on the sheet surface is desired.

  On the other hand, in the conventional method of manufacturing a sheet roll, in order to prevent winding form defects due to misalignment of the end surfaces of the sheet roll and scratches due to rubbing between sheets, in the vicinity of the end in the width direction of the sheet, Patent Document 1 There is known a method of increasing the coefficient of friction between sheets and increasing the adhesion between sheets by performing surface treatment such as embossing as disclosed or charging treatment as disclosed in Patent Document 2. ing.

  Patent Document 3 proposes a method of embossing while heating a sheet in order to further enhance the effect of surface treatment, and Patent Document 4 proposes a method of embossing while heating the emboss itself.

  In embossing, as shown in FIG. 1, a method is generally used in which a sheet 3 is sandwiched between an embossing ring 1 and a counter electrode ring 2, the embossing ring 1 is pressed against the counter electrode ring 2, and the embossing pattern on the surface of the embossing ring 1 is transferred to the sheet. Is.

  However, in this method, in order to obtain a desired transfer trace, it is necessary to press the embossing ring and the counter electrode ring uniformly and at a constant pressure, and there is a problem that adjustment is very difficult. In addition, there is a problem in that new scratches are generated on the sheet due to powder generated by rubbing the embossing ring and the sheet. Further, since the emboss pattern is transferred, the deformed portion may be restored to the state before the deformation over time, and there is a problem that the adhesion between the sheets cannot be maintained for a long time. Furthermore, the above-mentioned method of embossing by touching and pressing the embossing ring is not suitable for a film that is easy to break due to low toughness such as acrylic resin film or cellulose acylate film. It was. Moreover, in the case of the embossing method using a sheet or an embossing ring and utilizing plastic deformation of the sheet by heat, there is a problem that temperature adjustment is difficult in addition to the above problems. Moreover, in order to make the heated embossing ring contact, the film of the peripheral part which performs embossing is also heated. For this reason, the peripheral film is softened, causing breakage, and has a wide range of softening of the film, making it impossible to perform desired embossing.

In addition, since the charging process increases the adhesion between sheets only by static electricity, the new adhesion is weaker than that of embossing. In many cases, the effect to do was insufficient. In some cases, static electricity may induce new charging defects.
Japanese Patent No. 3479662 JP-A-9-20296 JP-A-49-132155 JP 52-96678 A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, a sheet roll manufacturing method and sheet that are easy to adjust and less likely to cause different defects when rolled up in a roll shape, and that are easy to adjust. An object of the present invention is to provide a roll and sheet roll manufacturing apparatus.

  In order to solve the above-mentioned problems, according to the present invention, the sheet is irradiated on both sides or one side of the sheet at a predetermined position in the width direction of the running sheet having a breaking elongation of 2% to 70%. A sheet roll characterized by irradiating an energy ray that gives absorbed energy, forming a deformed portion on the sheet at the irradiated portion and / or its peripheral portion, and then winding the sheet into a roll. A manufacturing method is provided.

  According to another aspect of the present invention, the energy absorbed by the sheet is applied to the irradiated portion of both sides or one side of the sheet at a predetermined position in the width direction of the traveling sheet having a breaking strength of 30 MPa to 120 MPa. A method for producing a sheet roll, characterized by irradiating an energy beam to be applied, forming a deformed portion on the sheet at the irradiated portion and / or its peripheral portion, and then winding the sheet into a roll. According to a preferred aspect of the invention, the energy beam is irradiated such that a maximum sheet thickness at a deformed portion formed by the irradiation is 105% or more and 150% or less of the sheet thickness before the irradiation. A method for manufacturing a sheet roll is provided.

  Further, according to a preferred embodiment of the present invention, there is provided a sheet roll manufacturing method, wherein the deformed portion is formed in a region within a range of a distance of 50 mm in the sheet width direction from an end portion in the width direction of the sheet. Is done.

  Moreover, according to the preferable form of this invention, the said irradiation part is irradiated, scanning the said energy ray with respect to the said sheet | seat in the sheet width direction, The sheet roll manufacturing method characterized by the above-mentioned is provided.

  Moreover, according to the preferable form of this invention, the sheet | seat roll manufacturing method characterized by using what divided | segmented into a plurality the energy ray emitted from the energy ray source as said energy ray is provided.

  Moreover, according to the preferable form of this invention, the said deformation | transformation site | part is formed intermittently, The sheet roll manufacturing method characterized by the above-mentioned is provided.

  Moreover, according to the preferable form of this invention, the irradiation part is irradiated, changing the output of the said energy ray according to the travel speed of the said sheet | seat, The sheet roll manufacturing method characterized by the above-mentioned is provided.

  Moreover, according to the preferable form of this invention, the sheet roll manufacturing method characterized by using a laser beam as said energy beam is provided.

  Further, according to another aspect of the present invention, the sheet is absorbed into the irradiated portion of both sides or one side of the sheet at a predetermined position in the width direction of the traveling sheet having a breaking elongation of 2% to 70%. A sheet roll produced by irradiating an energy ray to give the energy to be formed, forming a deformed portion on the sheet at the irradiated portion and / or its peripheral portion, and then winding the sheet into a roll shape Is done.

  According to another aspect of the present invention, the energy absorbed by the sheet at the irradiation site on both sides or one side of the sheet at a predetermined position in the width direction of the traveling sheet having a breaking strength of 30 MPa to 120 MPa. A sheet roll is provided that is produced by irradiating an energy beam that imparts, forming a deformed portion on the sheet at the irradiated portion and / or its periphery, and then winding the sheet into a roll. Moreover, according to the preferable form of this invention, the said sheet roll consists of an acrylic resin film roll, The sheet roll characterized by the above-mentioned is provided.

  According to another aspect of the present invention, there is provided a manufacturing apparatus for manufacturing a sheet roll comprising a sheet having a breaking elongation of 2% or more and 70% or less, wherein both sides of the sheet at a predetermined position in the width direction of the sheet or There is provided a sheet roll manufacturing apparatus characterized by having an energy ray irradiating means for irradiating an energy ray that imparts energy absorbed by the sheet to an irradiation portion on one side.

  According to another aspect of the present invention, there is provided a manufacturing apparatus for manufacturing a sheet roll made of a sheet having a breaking strength of 30 MPa or more and 120 MPa or less, and irradiation of both surfaces or one surface of the sheet at a predetermined position in the width direction of the sheet. There is provided a sheet roll manufacturing apparatus characterized by having energy ray irradiating means for irradiating an energy ray that imparts energy absorbed by the sheet at a site. Moreover, according to the preferable form of this invention, the manufacturing apparatus which manufactures the said sheet | seat roll is an apparatus which manufactures an acrylic resin film roll, Comprising: In the irradiation site | part of the sheet | seat in the predetermined | prescribed position of the width direction of a sheet | seat There is provided an apparatus for producing a sheet roll, characterized by comprising energy ray irradiating means for irradiating energy rays that impart energy absorbed by the sheet.

  In the present invention, a resin sheet having a breaking elongation of 2% to 70% or a resin sheet having a breaking strength of 30 MPa to 120 MPa is used as the sheet. Of course, a resin sheet having a breaking elongation of 2% to 70% and a breaking strength of 30 MPa to 120 MPa may be used. Among these, it is effective for films such as acrylic resin films and cellulose acylate films. Moreover, the mixture and copolymer of these resin may be sufficient. Various additives such as antistatic agents, weathering agents, inorganic or organic particles, lubricants such as wax, and pigments may also be included.

The breaking elongation and breaking strength of the resin sheet are determined by the method defined in JIS K7127 / 2 / 10-1999. The elongation at break is the tensile elongation when the resin sheet is pulled using a tensile tester and the sample breaks. Based on the method defined above, the sample length before the test is L ₀ , When the sample length is L, the elongation at break = (L−L ₀ ) / L ₀ is a value expressed as a percentage (%). The breaking strength means a value obtained by dividing the load at the time of breaking in the above test by the cross-sectional area of the sample. If the breaking elongation is less than 2% and / or the breaking strength is less than 30 MPa, the toughness of the sheet is very low and tearing may occur during winding. Conversely, when the breaking elongation and breaking strength are high, that is, when the toughness is large, there is no great difference from the conventional technique from the viewpoint of preventing the sheet from cracking or breaking, but a sheet with relatively low toughness, In the case of a sheet having a breaking elongation of 70% or less and / or a breaking strength of 120 MPa or less, the present invention is suitable because the sheet can be prevented from being cracked or torn compared to the conventional technique.

  In the present invention, the irradiation site refers to the position of the sheet to which the energy beam is irradiated, and in the case of a wide sheet, it is preferable to provide the irradiation site at two locations on both ends.

  In the present invention, the energy ray refers to energy propagation having a non-contact directivity with respect to the sheet, including wavelength components such as ultraviolet rays, visible rays, infrared rays, laser rays, and radiation. The energy ray that imparts energy absorbed by the sheet is typically a light beam that contains a wavelength component that is easily absorbed by the sheet. For example, when the sheet is a resin, a gas laser or solid Laser light such as a laser or a semiconductor laser is preferred.

  In the present invention, the deformation of the sheet is a range in which the sheet is not divided at the deformation part, and the integrity of the sheet is maintained even after the deformation, and when the sheet is wound into a roll shape, This refers to a change in properties such as a shape and chemical surface modification that increase the friction between the surface of the sheet and the surface of the layer of the sheet wound on the sheet. In particular, the sheet surface is preferably plastically deformed by heat.

  In the present invention, the sheet thickness before irradiation is an average thickness in the width direction before irradiation with energy rays.

  In the present invention, the irradiation site of the energy beam and the deformation site formed by the irradiation of the energy beam do not need to completely match, and the deformation site includes not only the irradiation site but also a site surrounded by the irradiation site, for example, All the parts that are deformed due to irradiation, such as the peripheral part of the irradiation part, are included.

  In the present invention, the width direction of the seat refers to a direction orthogonal to the running direction of the seat and the normal direction of the seat surface.

  In the present invention, as a method of scanning the energy beam in the width direction of the sheet, for example, there is a method of irradiating the energy beam while traversing in the width direction of the sheet by optical means. Here, scanning in the width direction means that the energy beam only needs to have a component that traverses in the width direction of the sheet, and the scanning direction does not necessarily coincide with the width direction.

  In the present invention, intermittently forming a deformed part means that the deformed part is arranged in a dotted line or a broken line, for example, when the aggregate state of a plurality of deformed parts is viewed macroscopically.

In the present invention, the shape, size, and number of the deformed portions are not particularly defined. For example, deformed portions having an area of about 0.01 to 1 mm ² are regularly arranged at a density of 1 piece / cm ² or more. It is preferable.

  In the present invention, dividing an energy beam emitted from an energy beam source into a plurality refers to branching one energy beam into a plurality of energy beams. As a means for dividing, a method of diffusing one energy ray and condensing again on a plurality of energy rays is preferable.

  According to the method for producing a sheet roll according to the present invention, as a surface treatment to an effective sheet for increasing the coefficient of friction between the sheets, a deformation site using plastic deformation that can maintain the effect for a long time is formed in a non-contact manner. Since it can be formed on the sheet by means, it is not necessary to uniformly adjust the pressing pressure of the embossing roll to the counter electrode roll, which has been a problem in embossing. In addition, generation of powder due to rubbing between the embossing ring and the sheet can be prevented, and the concern of generating new scratches can be eliminated. Further, it is not necessary to adjust the temperature when the embossing ring or the sheet is heated. Moreover, unlike the charging process, there is little concern that induces charging defects. Furthermore, in a resin sheet that has relatively low toughness and is prone to cracking and tearing, the deformation part is formed in a non-contact manner, so that only the deformation part is heated, and heating around the deformation part is as much as possible. It is suppressed, and there is little occurrence of cracking or tearing around the deformed part, and productivity is remarkably improved.

  Hereinafter, preferred embodiments of the present invention will be described.

  The maximum sheet thickness at the deformed part formed by irradiation of energy rays is not particularly restricted as long as it can secure an adhesive force that does not shift the sheets, but if it is too thin, it secures an adhesive force that does not shift the sheets. On the other hand, if it is too thick, the bumps that are stacked and formed when it is rolled up will also become large, and there will be new defects such as inducing new wrinkles around the bumps and damaging the contact roll. In order to generate | occur | produce, it is preferable to irradiate an energy ray so that the maximum sheet thickness in the deformation | transformation site | part formed by irradiation may be 105 to 150% of the sheet thickness before irradiation. When the thickness is less than 105% of the sheet before irradiation, the adhesion between the sheets is low, and when the thickness is more than 150%, wrinkles are induced or the contact roll is damaged. The contact roll is a roll that is pressed against the take-up roll in order to eliminate the air entrained between the sheets when the sheet is taken up into a roll shape. Generally, a roll whose surface is covered with rubber is used. Use.

  Since the deformed part formed by irradiation is generally treated as waste from the viewpoint of quality in the subsequent process, the deformed part is preferably arranged in the vicinity of the end of the sheet, particularly in the subsequent process. In order to prevent a decrease in yield, the deformed portion is preferably formed in a region within a range of a distance of 50 mm in the sheet width direction from the sheet width direction end. If the deformed part is at a distance of 50 mm or more from the widthwise end of the sheet, the yield is lowered, which is not preferable. In the case of a wide sheet, the deformed portions may be arranged at two locations near both ends.

  If the deformation part is formed in a wide range in the width direction, the adhesion between the films can be further increased. As a means for forming the deformed part in a wide range, it is not necessary to arrange a large number of energy ray sources in the width direction by irradiating the irradiation part while scanning the energy ray in the sheet width direction with respect to the sheet. The object of the present invention is preferable because it can be achieved at a low cost.

  As another means of forming a deformed part formed by irradiation in a wide range, it is possible to divide energy rays emitted from the energy source as energy rays into a plurality of parts and then irradiate the irradiation part. Since it is not necessary to install many in the direction, the object of the present invention can be achieved at low cost, which is preferable.

  It is preferable to form the deformed portion intermittently because the coefficient of friction between the sheets can be further increased and the adhesion between the sheets can be increased. As a means for intermittently forming the deformed portion, for example, an energy beam may be pulse-irradiated. In addition, since an energy beam source with the same output can obtain a higher peak output with pulse irradiation than with continuous irradiation, the output of the energy beam source necessary for forming a deformed site can be lowered, and the object of the present invention is inexpensive. There is also an advantage that can be achieved.

  It is also preferable to irradiate the irradiation site while changing the output of the energy beam according to the traveling speed of the seat. When winding the sheet, acceleration / deceleration accompanies the traveling speed, so by irradiating the sheet while changing the output of the energy ray source according to the traveling speed of the sheet, the sheet thickness at the deformation site in the entire longitudinal direction of the sheet It is possible to easily adjust arbitrarily, for example, the distribution of.

Using laser light as the energy beam is preferable because it can efficiently generate heat energy at the irradiated site and deform it. The type of laser is not particularly limited. For example, as a laser for deforming a resin sheet, a CO ₂ laser is preferable in consideration of the absorption rate into the resin, the output stability of the laser, the price of the laser oscillator, and the like. The wavelength is particularly preferably in the range of infrared rays (0.8 to 20 μm) having a high absorption rate in the plastic film. In the acrylic resin film, a wavelength of 5.0 to 15.0 μm is more preferable because of its high absorption rate. Practically, a CO ₂ laser having a wavelength near 10 μm is optimal.

  The sheet roll of the present invention is preferable because the coefficient of friction between the sheets increases depending on the deformed portion and the adhesion between the sheets increases, so that there is no end face displacement or scratch when winding in a roll shape.

  According to the present invention, when the sheet roll manufacturing apparatus described above is used, the friction coefficient between the sheets increases due to the deformation of the irradiated portion, the adhesion between the sheets increases, and the end face deviation or scratches occur when winding in a roll shape. This is preferable because a sheet having no film can be produced.

  FIG. 2 shows an example in which the sheet roll manufacturing method according to the present embodiment is applied to an apparatus (slitter) that divides a wide sheet of an acrylic resin film into a narrow width and winds a plurality of winding rolls. .

In FIG. 2, the wide acrylic resin film 9 unwound from the unwinding roll 4 is divided and slit into a predetermined small width by the slit portion 6, and laser irradiation is performed near the both ends of the narrow film by the laser irradiation portion 7. After that, it is wound up as a winding roll 5. In FIG. 2, conveyance rolls and the like not directly related to the present invention are omitted. FIG. 3 is a top view of the laser irradiation unit 7 viewed from vertically above in the film traveling direction, and FIG. 4 is a side sectional view of the laser irradiation unit 7 viewed from upstream in the film traveling direction. The laser irradiation unit 7 is provided with a polygonal polygon mirror 11 that is rotated by a motor. A CO ₂ laser beam 16 output as a pulse wave from a commercially available CO ₂ laser oscillator 15 installed on the side surface of the slitter is The optical path is bent by a plurality of mirrors 14 provided in the middle of the optical path, and then incident on the polygonal surface of the polygon mirror 11. The mirror is not particularly limited as long as it can reflect laser light, such as a plane mirror or a curved mirror. When the polygon mirror 11 is rotated, the incident angle and reflection angle with respect to the polygonal plane of the CO ₂ laser beam 16, in order to vary the pitch of the polygonal surface, the CO ₂ laser beam 16 reflected, depending on the rotation of the polygon mirror 11 Thus, the optical path is scanned in the film width direction, and a deformed portion 13 a is formed in the vicinity of the film end 8 of the acrylic resin film 9. It is preferable that the optical path of the CO ₂ laser beam 16 is surrounded by a pipe, a seal box, or the like so that the laser beam does not leak around until the film is irradiated from the CO ₂ laser oscillator 15.

  FIG. 5 shows an example of a deformed portion formed on the film. An intermittent deformation site 13a is formed in the range of 10 mm to 20 mm in the vicinity of the film end 8 of the acrylic resin film 9. Further, by increasing the pulse oscillation frequency, it is possible to connect a part of the intermittent deformation parts to be formed, and to form a part of the continuous deformation part.

FIG. 6 shows a cross-sectional view of the deformed portion 13a. Since the CO ₂ laser beam is absorbed by the polyester film and heat energy is generated in the irradiated portion 18, the film melts, and due to the surface tension, a bead-like bulge is formed at the peripheral portion of the irradiated portion 18 as shown in FIG. 17 is formed. The output of the CO ₂ laser oscillator 15 can be appropriately changed according to the traveling speed of the acrylic resin film 9 so that the height of the bulge 17 of the deformed portion 13a becomes an optimum value according to the traveling speed of the acrylic resin film 9. is there. The laser irradiation part is provided at two positions on both ends of the film (one side is omitted in the above description), and the film irradiated with laser at two positions on both ends of the film does not shift between the films when wound in a roll shape. End face displacement and scratches can be prevented.

  As a means for scanning the optical path of the laser beam in the film width direction, a galvano mirror method in which a plane mirror is vibrated by a motor and the laser beam 16 is scanned in the width direction may be used instead of the polygon mirror. Further, as shown in FIG. 7, by dividing the optical path of the laser in the film width direction by a dividing means such as a prism lens 19 and irradiating the divided laser light on the film, a deformed portion as shown in FIG. 13b may be formed.

  In addition, if the deformation | transformation site | part by laser irradiation can be formed in the upstream of the process which winds up a sheet | seat in the roll shape vicinity of a sheet | seat, the location of a laser irradiation part will not be regulated in particular. In FIG. 2, the slit part is provided downstream of the laser irradiation part, but the laser irradiation part may be provided downstream of the slit part, and as shown in FIG. 9, on the unwinding roll 4 and the winding roll 5. A laser irradiation unit may be provided. In addition, a laser irradiation unit may be provided in the middle of the process of winding the sheet formed in the film forming process into a roll shape as an intermediate product while maintaining a wide width.

The specific example which applies the above sheet roll manufacturing method to the slitter of a resin sheet is demonstrated. An acrylic resin film having a thickness of 80 μm is used for the resin sheet. The slitter includes an unwinding section for unwinding a film roll having a width of 2000 mm, a slit section for splitting the film into a small width of 1000 mm, a laser irradiation section for irradiating each end of the narrow film with a CO ₂ laser, and a narrow width film. It is composed of a winding unit that winds up in a roll shape. The traveling speed of the film is 60 m / min. In the laser irradiation unit, CO ₂ laser light pulse-oscillated at a frequency of 2000 Hz from a variable CO ₂ laser oscillator (wavelength 10.6 μm) in the range of output 10 to 30 W provided on the side of the slitter is optically transmitted by a mirror. After being bent and incident on the polygon mirror, the polygon mirror is rotated by a motor so that the reflected light from the polygon mirror is irradiated to the film while scanning the range in the width direction of 10 mm near the edge of the film at a predetermined speed. Has been. The spot diameter when the film is irradiated with laser is 0.1 mm. Since the sheet may come off from the laser beam irradiation position due to meandering of the sheet and the end surface of the sheet may be deformed, the width of the inner range is further increased from a place at least about 5 mm in the width direction from the end of the film. Traversing in the direction.
Here, according to the method specified in JIS K7127 / 2 / 10-1999, the breaking elongation and breaking strength of the acrylic resin film were measured at 25 ° C. and 65% using a trade name: Robot Tensilon RTA100 (Orientec). Measurement was performed 5 times in an RH atmosphere, and an average value was obtained. However, the test piece was a test piece type 2 in the JIS standard, and a sample having a width of 10 mm and a length of 150 mm (distance between marked lines was 50 mm) was used. The test speed was 10 mm / min. The point where the load passed 1N after the start of the test was taken as the origin of elongation.
[Example 1]
As a result of the above test, with respect to a film having a breaking elongation of 35% and a breaking strength of 75 MPa, the laser beam output was 10 W and the laser beam scanning speed in the film width direction was 0.5 m / sec. FIG. 10 shows a schematic diagram of intermittent deformation sites formed on the film in some cases. The maximum thickness of the deformed portion was 85 μm (106% with respect to the thickness of 80 μm before irradiation).
[Example 2]
A film having the same breaking elongation and breaking strength as in Example 1 was formed on the film when the laser beam output was 21 W and the laser beam scanning speed in the film width direction was 1 m / sec. A schematic diagram of the intermittently deformed portion is as shown in FIG. The maximum thickness of the deformed portion was 88 μm (110% with respect to the thickness before irradiation of 80 μm).
[Example 3]
A film having the same breaking elongation and breaking strength as in Example 1 was formed on the film when the laser beam output was 27 W and the laser beam scanning speed in the film width direction was 1 m / sec. A schematic diagram of the intermittently deformed portion is as shown in FIG. The maximum thickness of the deformed portion was 98 μm (123% with respect to the thickness of 80 μm before irradiation).
[Example 4]
As a result of the above test, on a film having a breaking elongation of 11% and a breaking strength of 50 MPa, when the laser beam output is 21 W and the laser beam scanning direction in the film width direction is 1 m / sec. FIG. 11 is a schematic view of the intermittently deformed portion formed on the surface. The maximum thickness of the deformed portion was 87 μm (109% with respect to the thickness before irradiation of 80 μm).
[Example 5]
As a result of the above test, on a film having a breaking elongation of 4% and a breaking strength of 40 MPa, the laser irradiation power is 21 W and the laser beam scanning direction in the film width direction is 1 m / sec. FIG. 11 is a schematic view of the intermittently deformed portion formed on the surface. The maximum thickness of the deformed portion was 87 μm (109% with respect to the thickness before irradiation of 80 μm).
[Comparative Example 1]
The film having the same breaking elongation and breaking strength as in Example 1 was run by the method shown in FIG. 1 while sandwiching the film between the embossing ring and the counter electrode ring. Here, the embossing ring is a metal ring having an outer diameter of 120 mm and a surface length of 100 mm, and is rotatably supported. An embossed pattern having a width of 10 mm is formed at the center of the surface length of the ring surface. As the embossed pattern, a trapezoidal cylindrical pattern having a bottom diameter of 0.9 mm, a top surface of about 0.3 mm, and a height of 0.6 mm is uniformly arranged. The counter electrode ring is a metal ring having an outer diameter of 120 mm and a surface length of 100 mm, and is rotatably supported. In addition, the press of the embossing ring was 2 kN / m, and the surface temperature of the embossing ring was 200 degreeC. Although it traveled 10 m after the embossing contact, the film was torn from the embossing contact part and could not be wound into a roll. The maximum thickness of the deformed portion was 92 μm (115% with respect to the thickness of 80 μm before the embossing contact).

[Comparative Example 2]
The film having the same breaking elongation and breaking strength as in Example 4 was run by sandwiching the film between the embossing ring and the counter electrode ring by the method shown in FIG. In addition, the structure of the embossing ring and the counter electrode ring was the same as that of the comparative example 1, the press of the embossing ring was 2 kN / m, and the surface temperature of the embossing ring was 200 degreeC. Immediately after the emboss ring contact, the film was torn from the emboss ring contact portion and could not be wound into a roll.

[Comparative Example 3]
The film having the same breaking elongation and breaking strength as in Example 5 was run by sandwiching the film between the embossing ring and the counter electrode ring by the method shown in FIG. In addition, the structure of the embossing ring and the counter electrode ring was the same as that of Comparative Example 1, the pressing of the embossing ring was 1.5 kN / m, and the surface temperature of the embossing ring was 200 ° C. Immediately after the emboss ring contact, the film was torn from the emboss ring contact portion and could not be wound into a roll.

  Any film in which a deformed portion as shown in Examples 1 to 5 is formed in the vicinity of the film end can be prevented from being misaligned or scratched because the films are not displaced when wound into a roll. On the other hand, in the methods as shown in Comparative Examples 1 to 3, a deformation site could not be stably formed on the film, and the film could not be wound into a roll.

The present invention is particularly suitable when the sheet is a resin sheet.

It is the structure schematic which shows the conventional embossing. It is a composition schematic diagram showing one embodiment of a sheet roll manufacturing method of the present invention. It is the top view which looked at the laser irradiation part of FIG. 2 from the perpendicular | vertical upper direction of the running direction of a film. It is the side view which looked at the laser irradiation part of FIG. 2 from the running direction of the film. It is the schematic which shows the deformation | transformation site | part formed intermittently on a film in FIG. FIG. 6 is a vertical cross-sectional view of the deformed portion in FIG. 5. It is the side view which looked at the laser irradiation part in another one Embodiment of the sheet roll manufacturing method of this invention from the film running direction upstream. It is the schematic which shows the deformation | transformation site | part formed intermittently on a film in FIG. It is the structure schematic which shows another one Embodiment of the sheet roll manufacturing method of this invention. It is the schematic which shows the deformation | transformation site | part formed intermittently on a film in Example 1. FIG. It is the schematic which shows the deformation | transformation site | part formed intermittently on a film in Examples 2-5.

Explanation of symbols

1 embossed ring 2 counter ring 3 sheets 4 unwinding roll 5 the winding roll 6 slit 7 the laser irradiation portion 8 film edge 9 acrylic resin film 10 motor 11 the polygon mirror 12 covers 13a, 13b deformed portion 14 mirror 15 CO ₂ laser oscillator 16 CO ₂ laser light 17 swell 18 irradiation area 19 prism lens

Claims (16)

Traveling, irradiating the irradiation site of both sides or one side of the sheet at a predetermined position in the width direction of the sheet having a breaking elongation of 2% or more and 70% or less with energy rays that impart energy absorbed by the sheet, A method for producing a sheet roll, comprising forming a deformation site on the sheet at an irradiation site and / or a peripheral portion thereof, and then winding the sheet into a roll. The irradiation site is irradiated with energy rays that impart energy absorbed by the sheet to an irradiation site on both sides or one side of the sheet at a predetermined position in the width direction of the sheet having a breaking strength of 30 MPa or more and 120 MPa or less, and the irradiation site and A method for producing a sheet roll, comprising: forming a deformed portion in the sheet at the periphery thereof; and then winding the sheet into a roll. The said energy ray is irradiated so that the maximum sheet thickness in the said deformation | transformation site | part formed by the said irradiation may be 105% or more and 150% or less of the sheet thickness before the said irradiation, It is characterized by the above-mentioned. Item 3. A method for producing a sheet roll according to Item 2. The sheet roll production according to any one of claims 1 to 3, wherein the deformation part is formed in a region within a distance of 50 mm in a width direction of the sheet from an end in a width direction of the sheet. Method. The method of manufacturing a sheet roll according to any one of claims 1 to 4, wherein the irradiation portion is irradiated while scanning the energy beam with respect to the sheet in a width direction of the sheet. The method for manufacturing a sheet roll according to any one of claims 1 to 5, wherein an energy beam emitted from an energy beam source is used as the energy beam. The method for manufacturing a sheet roll according to any one of claims 1 to 6, wherein the deformed portion is formed intermittently. The method of manufacturing a sheet roll according to any one of claims 1 to 7, wherein the irradiation site is irradiated while changing the output of the energy beam in accordance with the traveling speed of the sheet. The method for manufacturing a sheet roll according to claim 1, wherein a laser beam is used as the energy beam. The method for manufacturing a sheet roll according to any one of claims 1 to 9, wherein an acrylic resin film is used as the sheet. Traveling, irradiating the irradiation site of both sides or one side of the sheet at a predetermined position in the width direction of the sheet having a breaking elongation of 2% or more and 70% or less with energy rays that impart energy absorbed by the sheet, A sheet roll produced by forming a deformed portion in the sheet at the irradiated portion and / or its peripheral portion, and then winding the sheet into a roll. The irradiation site is irradiated with energy rays that impart energy absorbed by the sheet to an irradiation site on both sides or one side of the sheet at a predetermined position in the width direction of the sheet having a breaking strength of 30 MPa to 120 MPa. And / or a sheet roll produced by forming a deformed portion in the sheet at the periphery thereof and then winding the sheet into a roll. The sheet roll according to claim 11 or 12, wherein an acrylic resin film roll is used as the sheet roll. A manufacturing apparatus for manufacturing a sheet roll made of a sheet having a breaking elongation of 2% or more and 70% or less, wherein the sheet is absorbed by the sheet on one or both sides of the sheet at a predetermined position in the width direction of the sheet. An apparatus for manufacturing a sheet roll, comprising: an energy ray irradiating unit that irradiates an energy ray that imparts energy. A manufacturing apparatus for manufacturing a sheet roll made of a sheet having a breaking strength of 30 MPa or more and 120 MPa or less, which imparts energy absorbed by the sheet to an irradiation site on both sides or one side of the sheet at a predetermined position in the width direction of the sheet. An apparatus for producing a sheet roll, comprising: an energy ray irradiating means for irradiating an energy ray to be emitted. The sheet roll manufacturing apparatus according to claim 14, wherein an acrylic resin film is used as the sheet.

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