WO2013141178A1 - Surface protective sheet - Google Patents

Surface protective sheet Download PDF

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Publication number
WO2013141178A1
WO2013141178A1 PCT/JP2013/057545 JP2013057545W WO2013141178A1 WO 2013141178 A1 WO2013141178 A1 WO 2013141178A1 JP 2013057545 W JP2013057545 W JP 2013057545W WO 2013141178 A1 WO2013141178 A1 WO 2013141178A1
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Prior art keywords
workpiece
protective sheet
sheet
surface protective
base material
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PCT/JP2013/057545
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French (fr)
Japanese (ja)
Inventor
山本　充志
林　圭治
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日東電工株式会社
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Publication of WO2013141178A1 publication Critical patent/WO2013141178A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/009—Working by laser beam, e.g. welding, cutting or boring using a non-absorbing, e.g. transparent, reflective or refractive, layer on the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/241—Polyolefin, e.g.rubber

Definitions

  • the present invention relates to a surface protective sheet, and more particularly to a surface protective sheet for a workpiece to be subjected to laser cutting and bending.
  • a surface protective sheet is affixed.
  • surface of resin-made base materials is mentioned.
  • Patent Documents 1 to 3 propose proposals for solving the problem of peeling off the surface protective sheet due to the influence of the assist gas.
  • the problem to be solved by the present invention is that a residue is hardly generated in the laser cutting process, and the state of being in close contact with the workpiece is maintained without being broken in the bending of the workpiece. It is to provide a surface protection sheet. Also provided is a method of processing a workpiece that prevents the surface of the workpiece from fouling during laser cutting and ensures the surface protection of the workpiece during bending after laser cutting. It is.
  • the present inventors have found that the above problem can be solved by adopting the following configuration. That is, the present invention is as follows.
  • a surface protection sheet that is subjected to laser cutting and further affixed to a laser beam irradiated surface of a workpiece to be subjected to bending, A substrate and a pressure-sensitive adhesive layer provided on one side of the substrate; A surface protective sheet, wherein the thickness of the substrate is 10 to 60 ⁇ m, and the breaking elongation of the sheet is 250% or more.
  • the surface protective sheet according to the above [1] wherein the substrate is a polyolefin-based substrate.
  • the laser cutting process is a laser cutting process in which a workpiece is cut by irradiating the workpiece with a laser beam under supply of an assist gas.
  • a surface protection sheet is affixed to the laser beam irradiation surface of the workpiece, the workpiece is irradiated with a laser beam through the surface protection sheet, and the workpiece is laser cut, and the workpiece is further processed.
  • a processing method for bending into The surface protection sheet has a base material and an adhesive layer provided on one side of the base material, A processing method, wherein the thickness of the substrate is 10 to 60 ⁇ m, and the elongation at break of the sheet is 250% or more.
  • the surface protective sheet of the present invention there is no generation of residue associated with laser cutting, and the surface protection of the workpiece can be reliably performed during machining such as bending after laser cutting. According to the processing method of the present invention, it is possible to protect the surface of the workpiece during laser cutting and bending, and it is possible to quickly shift from laser cutting to bending.
  • the surface protection sheet of this invention has a base material and the adhesive layer formed in the single side
  • Base material A base material is a resin-made base material normally, and the kind of resin is not specifically limited.
  • the resin constituting the base material any resin can be used without particular limitation as long as the elongation at break of the surface protective sheet can be 250% or more (preferably 300% or more).
  • polyolefins such as polypropylene and polyethylene are preferable from the viewpoint of increasing elongation at break.
  • the polyethylene may be any of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and very low density polyethylene (VLDPE), but preferably low density polyethylene (LDPE), linear Low density polyethylene (LLDPE). From the viewpoint of increasing the elongation at break of the surface protective sheet, linear low density polyethylene (LLDPE) is most preferable.
  • the resin constituting the substrate may be one kind or a mixture of two or more kinds.
  • the base material is formed into a film having a thickness of 10 to 60 ⁇ m by a known resin molding method such as a T-die method or an inflation method, and further subjected to a stretching treatment as necessary.
  • the thickness of the substrate is preferably 30 to 60 ⁇ m, more preferably 40 to 50 ⁇ m. If the thickness of the substrate exceeds 60 ⁇ m, a residue of the surface protection sheet is likely to be generated at the laser cutting end of the workpiece during laser cutting. On the other hand, when the thickness of the base material is less than 10 ⁇ m, the surface protection sheet using such a base material is insufficient in strength and handling properties are lowered, so that practicality is lowered.
  • the base material is filled with fillers such as calcium carbonate, talc and calcium oxide, anti-blocking agent, lubricant, titanium oxide, organic and inorganic pigments for coloring purposes, deterioration prevention, etc.
  • fillers such as calcium carbonate, talc and calcium oxide, anti-blocking agent, lubricant, titanium oxide, organic and inorganic pigments for coloring purposes, deterioration prevention, etc.
  • Appropriate additives such as antioxidants, ultraviolet absorbers, light stabilizers and antistatic agents can be blended.
  • a plasticizer etc. can be mix
  • surface treatment such as corona treatment may be applied to the substrate surface for the purpose of improving the adhesion with the back surface treatment agent, the pressure sensitive adhesive and the undercoat.
  • the pressure-sensitive adhesive layer is provided on one side of the base material layer.
  • the pressure-sensitive adhesive layer only needs to have adhesiveness to a stainless steel plate, which is a typical workpiece (work), such as a known rubber-based pressure-sensitive adhesive, acrylic pressure-sensitive adhesive, polyester-based pressure-sensitive adhesive, polyurethane-based pressure-sensitive adhesive, etc. Can be used.
  • rubber adhesives and acrylic adhesives are preferable from the viewpoints of adhesion to metal plates, releasability, and cost. Rubber-based adhesives and acrylic-based adhesives are preferable because they have adhesiveness to metal plates and glass plates other than stainless steel plates.
  • rubber adhesives examples include natural rubber adhesives and synthetic rubber adhesives.
  • Synthetic rubber adhesives include polybutadiene; polyisoprene; butyl rubber; polyisobutylene; styrene / butadiene / styrene block copolymer, styrene / ethylene / butylene / styrene block copolymer, styrene / ethylene / butylene random copolymer, etc.
  • Styrene elastomers ethylene propylene rubber; propylene butene rubber; ethylene propylene butene rubber and the like are used as main components.
  • acrylic pressure-sensitive adhesives include alkyl (meth) acrylates such as butyl (meth) acrylate and 2-ethylhexyl (meth) acrylate as main components, and 2-hydroxyethyl as a modifying monomer that can be copolymerized therewith if necessary. Copolymerization of monomer mixture with other monomers such as hydroxyl group-containing monomers such as (meth) acrylate, carboxy group-containing monomers such as (meth) acrylic acid, styrene monomers such as styrene, vinyl esters such as vinyl acetate Coalescence is used.
  • the acrylic pressure-sensitive adhesive can be obtained by a conventional polymerization method such as a solution polymerization method, an emulsion polymerization method, or a UV polymerization method.
  • crosslinking agents for example, crosslinking agents, tackifiers, softeners, olefin resins, silicone polymers, liquid acrylic copolymers, phosphate ester compounds , Anti-aging agents, light stabilizers such as hindered amine light stabilizers, ultraviolet absorbers, and other suitable additives such as fillers and pigments such as calcium oxide, magnesium oxide, calcium carbonate, silica, zinc oxide, and titanium oxide Can be blended.
  • the compounding of the tackifier is effective for improving the adhesive strength, and the blending amount is based on the above-mentioned pressure-sensitive adhesive 100 parts by weight from the viewpoint of improving the adhesive force while avoiding the occurrence of the adhesive residue problem due to the decrease in cohesive force.
  • the amount is preferably 0 to 50 parts by weight, more preferably 0 to 30 parts by weight, particularly preferably 0 to 10 parts by weight.
  • 0 part by weight means that no tackifier is blended.
  • tackifier examples include aliphatic resins, aromatic resins, aliphatic / aromatic copolymer systems, alicyclic petroleum resins, coumarone indene resins, terpene resins, terpene phenol resins, Polymerized rosin-based resins, (alkyl) phenol-based resins, xylene-based resins, and hydrides thereof can be appropriately used those known in the adhesive field.
  • 1 type (s) or 2 or more types can be used for a tackifier.
  • the thickness of the pressure-sensitive adhesive layer can be appropriately set according to the adhesive force and the like, and is generally 1 to 30 ⁇ m, preferably 2 to 20 ⁇ m, more preferably 3 to 15 ⁇ m. If necessary, the pressure-sensitive adhesive layer can be temporarily attached with a separator or the like until it is put to practical use.
  • the surface protective sheet can be formed by, for example, applying a solution obtained by dissolving the adhesive composition in a solvent or a hot melt of the adhesive composition to the substrate, or an adhesive layer on the separator.
  • the surface protective sheet may include a release layer.
  • the release agent for forming the release layer solvent-type or solvent-free type silicone polymers and long-chain alkyl polymers (polymers having long-chain alkyl groups) are generally used. Specifically, pyroyl (manufactured by Yushi Co., Ltd., long-chain alkyl polymer), Shin-Etsu Silicone (manufactured by Shin-Etsu Chemical Co., Ltd., silicone-based polymer) and the like are available.
  • a known coating method such as a coating method using a roll coater such as a gravure roll or a spraying method using spray or the like can be adopted.
  • the surface protective sheet of the present invention has a breaking elongation of 250% or more.
  • a sheet having a breaking elongation of 250% or more is affixed to a workpiece (work), and when the workpiece (work) is subjected to mechanical processing such as bending, the workpiece (work) is not torn. Following the deformation, the surface protection of the workpiece (work) is ensured.
  • the elongation at break is preferably 300% or more, more preferably 400% or more.
  • the upper limit of elongation at break is not particularly limited, but is preferably 1500% or less, and more preferably 1200% or less.
  • the elongation at break is a percentage of the length between the gauge points after the sheet breaks with respect to the length between the gauge points before the force is applied.
  • the breaking elongation of the sheet is measured according to the method described later.
  • FIG. 1 shows an embodiment in which the surface protective sheet of the present invention is used by being attached to a workpiece to be subjected to laser cutting.
  • the surface protection sheet 1 is affixed to a laser beam irradiation surface of a workpiece (workpiece) 2 to be cut by laser beam 6 irradiation.
  • the laser beam 6 is condensed by the condenser lens 31 of the processing head 3 and then irradiated to the workpiece 2 from the nozzle 4.
  • the laser beam generator is not limited to the illustrated one.
  • the laser beam 6 is usually a carbon dioxide laser, but may be a YAG laser, a fiber laser, or the like.
  • the assist gas 7 is sprayed onto the work 2 together with the laser beam 6 at a high pressure of about 0.5 to 1.5 MPa.
  • the assist gas 7 is supplied from a gas supply means 5 such as a gas cylinder through an introduction pipe 51 and a gas introduction port 41.
  • the assist gas 7 can be selected from various gases depending on the material of the workpiece 2 and the required cut surface quality. Typically, nitrogen gas or air is used.
  • Examples of the workpiece (work material) 2 include a metal plate, a painted metal plate, an aluminum sash, a resin plate, a decorative copper plate, a vinyl chloride laminated steel plate, a glass plate, and the like.
  • Cutting by irradiating the laser beam 6 is performed by forming a cutting portion penetrating from one side of the workpiece (workpiece) 2 to the side opposite to the side irradiated with the laser beam 6 and irradiating at least one of the workpieces 2. It is the process which cuts off a part, The process which removes a part of workpiece
  • the surface protective sheet 1 of the present invention is for sticking to a laser beam irradiation surface of a workpiece (workpiece) 2 in such a cutting process.
  • the workpiece 2 is irradiated with the laser beam 6 from the surface protective sheet 1 side through the surface protective sheet 1 while the surface protective sheet 1 of the present invention is stuck on the workpiece (workpiece) 2.
  • Cutting is performed.
  • the surface protection sheet 1 prevents the surface of the workpiece (workpiece) 2 from being soiled.
  • the workpiece is a metal plate or a painted metal plate
  • it is usually placed on a V-shaped die. Set the workpiece and press it with a punch to deform the workpiece to an arbitrary angle.
  • the surface protective sheet of the present invention extends following the deformation of the workpiece, the surface protective sheet is kept in close contact with the workpiece, and the surface protection of the workpiece is stabilized.
  • a pressure-sensitive adhesive on the surface of the film that has not been subjected to a release treatment with a release agent after applying a release agent of a polymer on the other hand, Oily Industries Co., Ltd., Pyroyl 1010) and drying at 80 ° C. for 1 minute.
  • Polyisobutylene manufactured by BASF, Opanol B80 was applied so that the thickness after drying was 14 ⁇ m, and dried at 80 ° C. for 2 minutes to obtain a surface protective sheet.
  • Example 2 In Example 1, the following acrylic pressure-sensitive adhesive was applied to the pressure-sensitive adhesive layer, the thickness of the pressure-sensitive adhesive layer was set to 5 ⁇ m, the mold release treatment was not performed, and the pressure-sensitive adhesive layer was directly formed on the corona-treated surface. In the same manner as in No. 1, a surface protective sheet was obtained.
  • an isocyanate-based crosslinking agent manufactured by Nippon Polyurethane Industry Co., Ltd., Coronate L
  • Example 3 In Example 2, a surface protective sheet was obtained in the same manner as in Example 2 except that the thickness of the pressure-sensitive adhesive layer was 10 ⁇ m.
  • Example 4 A surface protective sheet was obtained in the same manner as in Example 3 except that the base material was changed to an LLDPE film having a thickness of 40 ⁇ m obtained by the T-die method and an adhesive layer was formed on the corona-treated surface of the film.
  • Example 5 A surface protective sheet was obtained in the same manner as in Example 3 except that the base material was changed to an LLDPE film having a thickness of 50 ⁇ m obtained by the inflation method and an adhesive layer was formed on the corona-treated surface of the film.
  • Example 6 A surface protective sheet was obtained in the same manner as in Example 3 except that the base material was changed to an LDPE film having a thickness of 60 ⁇ m obtained by the inflation method, and an adhesive layer was formed on the corona-treated surface of the film.
  • Comparative Example 1 A surface protective sheet was prepared in the same manner as in Example 6 except that the thickness of the base material was 90 ⁇ m, the following pressure-sensitive adhesive was applied to the pressure-sensitive adhesive layer, and a pressure-sensitive adhesive layer having a thickness of 15 ⁇ m was formed on the corona-treated surface of the base material. Obtained.
  • Tackifier manufactured by Eastman Chemical, Piccotac 1100-E
  • isocyanate crosslinking agent manufactured by Bayer, Desmodur RFE 1 part by weight were added to 100 parts by weight of natural rubber to obtain an adhesive composition.
  • Comparative Example 2 A surface protective sheet was obtained in the same manner as in Example 1 except that the base material was changed to an LDPE film having a thickness of 100 ⁇ m obtained by the inflation method, and an adhesive layer having a thickness of 10 ⁇ m was formed on the corona-treated surface of the film.
  • Comparative Example 3 A surface protective sheet was obtained in the same manner as in Example 6 except that the thickness of the base material was changed to 100 ⁇ m and the thickness of the pressure-sensitive adhesive layer was changed to 5 ⁇ m.
  • Comparative Example 4 A surface protective sheet was obtained in the same manner as in Comparative Example 3 except that the thickness of the pressure-sensitive adhesive layer was changed to 10 ⁇ m.
  • a surface protective sheet is bonded to the surface of a 1.5 mm thick SUS3042B plate wiped with a waste impregnated with toluene with a laminator (linear pressure 40 N / cm, speed 3 m / min) for 30 minutes or more.
  • the SUS3042B plate was cut into a straight line at a rate of 8 m / min while irradiating a laser beam with a carbon dioxide laser device (TruLaser 3030 manufactured by Trumpf Co., Ltd.).
  • Table 1 below shows the structure and test results of the surface protective sheets prepared in the examples and comparative examples.

Abstract

A surface protective sheet affixed to a laser beam irradiation surface of a material to be machined that is subjected to a laser cutting process and then to a bending process, the surface protective sheet characterized by having a base material and an adhesive layer provided on one side of the base material, and in that the thickness of the base material is 10-60 µm, and the elongation at break of the sheet is at least 250%.

Description

表面保護シートSurface protection sheet
　本発明は表面保護シートに関し、詳しくは、レーザー切断加工および曲げ加工に供される被加工材の表面保護シートに関する。 The present invention relates to a surface protective sheet, and more particularly to a surface protective sheet for a workpiece to be subjected to laser cutting and bending.
　従来から、金属板、塗装した金属板、アルミサッシ、樹脂板、化粧鋼板、塩化ビニルラミネート鋼板、ガラス板等の部材を運搬、加工または養生する際等に、部材の表面保護のために部材に表面保護シートを貼付することが行われている。このような表面保護シートの一形態として、樹脂製の基材の片面に粘着層を設けた粘着シートの形態が挙げられる。 Conventionally, when transporting, processing or curing a metal plate, painted metal plate, aluminum sash, resin plate, decorative steel plate, vinyl chloride laminated steel plate, glass plate, etc. A surface protective sheet is affixed. As one form of such a surface protection sheet, the form of the adhesive sheet which provided the adhesion layer in the single side | surface of resin-made base materials is mentioned.
　上述の表面保護シートが貼付された部材に対して、レーザー切断加工を施す場合、表面保護シートが貼付された表面側からレーザーを照射して加工を行なう場合がある。これは、レーザー加工中に被加工材である部材の表面が汚損されるのを防止するためである。従って、このようなレーザー切断加工では、加工中に、表面保護シートが部材から剥がれたり、表面保護シートと部材との間に部分的な剥離（浮き）が生じないことが重要である。しかし、レーザー切断加工は、レーザー照射によって生じる被加工材の溶融物をレーザーと同軸で流れるアシストガスで吹き飛ばすことによって行われるため、加工前は表面保護シートが部材に密着していても、アシストガスの影響で加工中に保護シートが被加工材から剥離してしまうことがある。このため、特許文献１～３には、かかるアシストガスの影響による表面保護シートの剥離の問題を解消する提案がなされている。 When performing the laser cutting process on the member to which the above-described surface protection sheet is attached, there is a case in which the laser irradiation is performed from the surface side to which the surface protection sheet is attached. This is to prevent the surface of the member, which is a workpiece, from being soiled during laser processing. Therefore, in such laser cutting processing, it is important that the surface protection sheet is not peeled off from the member during processing, or that partial peeling (lifting) does not occur between the surface protection sheet and the member. However, since laser cutting is performed by blowing off the melt of the work piece generated by laser irradiation using an assist gas that flows coaxially with the laser, even if the surface protective sheet is in close contact with the member before processing, the assist gas As a result, the protective sheet may peel off from the workpiece during processing. For this reason, Patent Documents 1 to 3 propose proposals for solving the problem of peeling off the surface protective sheet due to the influence of the assist gas.
　また、表面保護シートが貼付された被加工材にレーザー切断加工を行うと、レーザー切断端部に保護シートの残渣が生じるため、通常、被加工材から保護シートを剥離後に残渣の拭き取り作業が行われている。しかし、この保護シートの残渣の拭き取り作業はレーザー加工におけるロスワークになっており、レーザー切断端部に保護シートの残渣が生じないようにすることが望ましい。また、レーザー切断加工された被加工材にはさらに曲げ加工等の機械的加工が施されることがあり、そのような被加工材に貼付する表面保護シートの場合、表面保護シートが破れると、破れた部分の被加工材が傷となるので、シートにはより破れにくいことが必要になる。 In addition, when laser cutting is performed on a workpiece with a surface protection sheet attached, a protective sheet residue is generated at the end of the laser cutting. Therefore, the residue is usually wiped after the protective sheet is peeled off from the workpiece. It has been broken. However, the wiping operation of the protective sheet residue is a loss work in laser processing, and it is desirable to prevent the protective sheet residue from being generated at the laser cutting end. In addition, mechanical processing such as bending may be further applied to the workpiece subjected to laser cutting, and in the case of a surface protective sheet to be attached to such workpiece, when the surface protective sheet is torn, Since the torn material is scratched, the sheet needs to be more resistant to tearing.
特開平２－２９５６８８号公報JP-A-2-295688 特開平７－２４１６８８号公報JP-A-7-241688 特開２００１－２１２６９０号公報JP 2001-212690 A
　従って、本発明が解決しようとする課題は、レーザー切断加工において残渣が発生しにくく、かつ、被加工材の曲げ加工においては破れが生じることなく、被加工材に密着した状態が維持される、表面保護シートを提供することである。
　また、レーザー切断加工時の被加工材表面の汚損を防止し、かつ、レーザー切断加工後の曲げ加工時の被加工材の表面保護が確実になされる、被加工材の加工方法を提供することである。 Therefore, the problem to be solved by the present invention is that a residue is hardly generated in the laser cutting process, and the state of being in close contact with the workpiece is maintained without being broken in the bending of the workpiece. It is to provide a surface protection sheet.
Also provided is a method of processing a workpiece that prevents the surface of the workpiece from fouling during laser cutting and ensures the surface protection of the workpiece during bending after laser cutting. It is.
　本発明者らは、以下の構成を採ることで、上記の課題を解決できることを見出した。すなわち、本発明は以下の通りである。
　［１］　レーザー切断加工に供され、さらに曲げ加工に供される被加工材のレーザービーム照射面に貼付される表面保護シートであって、
　基材と、該基材の片面に設けられた粘着剤層とを有し、
　基材の厚みが１０～６０μｍであり、当該シートの破断伸びが２５０％以上であることを特徴とする、表面保護シート。
　［２］　基材がポリオレフィン系基材である、上記[１]記載の表面保護シート。
　［３］　被加工材が金属板である、上記[１]または[２]記載の表面保護シート。
　［４］　レーザー切断加工が、アシストガスの供給下にレーザービームを被加工材に照射して被加工材の切断がなされるレーザー切断加工である、上記［１］～［３］のいずれか一つに記載の表面保護シート。
　［５］　被加工材のレーザービーム照射面に表面保護シートを貼付し、該表面保護シートを介して被加工材にレーザービームを照射して被加工材をレーザー切断加工し、さらに該被加工材に曲げ加工を行う加工方法であって、
　前記表面保護シートが、基材と、該基材の片面に設けられた粘着剤層とを有し、
　該基材の厚みが１０～６０μｍであり、当該シートの破断伸びが２５０％以上であることを特徴とする、加工方法。 The present inventors have found that the above problem can be solved by adopting the following configuration. That is, the present invention is as follows.
[1] A surface protection sheet that is subjected to laser cutting and further affixed to a laser beam irradiated surface of a workpiece to be subjected to bending,
A substrate and a pressure-sensitive adhesive layer provided on one side of the substrate;
A surface protective sheet, wherein the thickness of the substrate is 10 to 60 μm, and the breaking elongation of the sheet is 250% or more.
[2] The surface protective sheet according to the above [1], wherein the substrate is a polyolefin-based substrate.
[3] The surface protective sheet according to the above [1] or [2], wherein the workpiece is a metal plate.
[4] Any one of the above [1] to [3], wherein the laser cutting process is a laser cutting process in which a workpiece is cut by irradiating the workpiece with a laser beam under supply of an assist gas. The surface protection sheet described in 1.
[5] A surface protection sheet is affixed to the laser beam irradiation surface of the workpiece, the workpiece is irradiated with a laser beam through the surface protection sheet, and the workpiece is laser cut, and the workpiece is further processed. A processing method for bending into
The surface protection sheet has a base material and an adhesive layer provided on one side of the base material,
A processing method, wherein the thickness of the substrate is 10 to 60 μm, and the elongation at break of the sheet is 250% or more.
　本発明の表面保護シートによれば、レーザー切断加工に伴う残渣の発生が無く、しかも、レーザー切断加工後の曲げ加工等の機械加工中も被加工材の表面保護を確実になすことができる。
　本発明の加工方法によれば、レーザー切断加工および曲げ加工時における被加工材の表面保護を図ることができるとともに、レーザー切断加工から曲げ加工への移行を速やかに行うことができる。 According to the surface protective sheet of the present invention, there is no generation of residue associated with laser cutting, and the surface protection of the workpiece can be reliably performed during machining such as bending after laser cutting.
According to the processing method of the present invention, it is possible to protect the surface of the workpiece during laser cutting and bending, and it is possible to quickly shift from laser cutting to bending.
本発明の表面保護シートのレーザー切断加工での使用形態を示す模式図である。It is a schematic diagram which shows the usage pattern in the laser cutting process of the surface protection sheet of this invention.
　以下、本発明をその好適な実施形態に即して説明する。
　本発明の表面保護シートは、基材と、基材の片面に形成された粘着剤層とを少なくとも有する。 Hereinafter, the present invention will be described with reference to preferred embodiments thereof.
The surface protection sheet of this invention has a base material and the adhesive layer formed in the single side | surface of a base material at least.
（１）基材
　基材は、通常、樹脂製の基材であり、樹脂の種類は特に限定されない。基材を構成する樹脂は、表面保護シートの破断伸びを２５０％以上（好ましくは３００％以上）にすることができる樹脂であれば特に制限なく使用できる。なかでも、破断伸びをより大きくできる観点から、ポリプロピレン、ポリエチレン等のポリオレフィンが好ましい。また、ポリエチレンは、低密度ポリエチレン（ＬＤＰＥ）、直鎖状低密度ポリエチレン（ＬＬＤＰＥ）、超低密度ポリエチレン（ＶＬＤＰＥ）のいずれであってもよいが、好ましくは低密度ポリエチレン（ＬＤＰＥ）、直鎖状低密度ポリエチレン（ＬＬＤＰＥ）である。表面保護シートの破断伸びをより大きくする観点から直鎖状低密度ポリエチレン（ＬＬＤＰＥ）が最も好ましい。基材を構成する樹脂は１種であっても２種以上の混合物であってもよい。 (1) Base material A base material is a resin-made base material normally, and the kind of resin is not specifically limited. As the resin constituting the base material, any resin can be used without particular limitation as long as the elongation at break of the surface protective sheet can be 250% or more (preferably 300% or more). Of these, polyolefins such as polypropylene and polyethylene are preferable from the viewpoint of increasing elongation at break. The polyethylene may be any of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and very low density polyethylene (VLDPE), but preferably low density polyethylene (LDPE), linear Low density polyethylene (LLDPE). From the viewpoint of increasing the elongation at break of the surface protective sheet, linear low density polyethylene (LLDPE) is most preferable. The resin constituting the substrate may be one kind or a mixture of two or more kinds.
　基材は、Ｔダイ法、インフレーション法等の公知の樹脂成形法によって、また、必要に応じてさらに延伸処理を施して、厚み１０～６０μｍのフィルムに成形される。基材の厚みは好ましくは３０～６０μｍ、より好ましくは４０～５０μｍである。基材の厚みが６０μｍを超えると、レーザー切断加工の際に被加工材のレーザー切断端部に表面保護シートの残渣が生じやすくなる。一方、基材の厚みが１０μｍ未満の場合、そのような基材を使用した表面保護シートは強度不足でハンドリング性が低下して実用性が低下してしまう。 The base material is formed into a film having a thickness of 10 to 60 μm by a known resin molding method such as a T-die method or an inflation method, and further subjected to a stretching treatment as necessary. The thickness of the substrate is preferably 30 to 60 μm, more preferably 40 to 50 μm. If the thickness of the substrate exceeds 60 μm, a residue of the surface protection sheet is likely to be generated at the laser cutting end of the workpiece during laser cutting. On the other hand, when the thickness of the base material is less than 10 μm, the surface protection sheet using such a base material is insufficient in strength and handling properties are lowered, so that practicality is lowered.
　基材には、本発明の効果を損なわない範囲内で、炭酸カルシウム、タルク、酸化カルシウム等の充填材、アンチブロッキング剤、滑剤、酸化チタン、着色を目的とした有機及び無機顔料、劣化防止等を目的とした酸化防止剤、紫外線吸収剤、光安定剤や帯電防止剤等の適宜な添加剤も配合することができる。さらに基材の柔軟性向上のために可塑剤等も配合できる。また、背面処理剤、粘着剤、下塗り剤との密着性向上を目的として基材面にコロナ処理等の表面処理を施しても構わない。 As long as the effect of the present invention is not impaired, the base material is filled with fillers such as calcium carbonate, talc and calcium oxide, anti-blocking agent, lubricant, titanium oxide, organic and inorganic pigments for coloring purposes, deterioration prevention, etc. Appropriate additives such as antioxidants, ultraviolet absorbers, light stabilizers and antistatic agents can be blended. Furthermore, a plasticizer etc. can be mix | blended for the softness | flexibility improvement of a base material. Further, surface treatment such as corona treatment may be applied to the substrate surface for the purpose of improving the adhesion with the back surface treatment agent, the pressure sensitive adhesive and the undercoat.
（２）粘着剤層
　粘着剤層は、基材層の片面に設けられる。粘着剤層は典型的な被加工材（ワーク）であるステンレス板に対する粘着性を有していればよく、公知のゴム系粘着剤、アクリル系粘着剤、ポリエステル系粘着剤、ポリウレタン系粘着剤等が使用可能である。この中でも、金属板への接着性、剥離性、コストの観点からゴム系粘着剤やアクリル系粘着剤が好ましい。ゴム系粘着剤およびアクリル系粘着剤はステンレス板以外の金属板やガラス板への粘着性も有していて好ましい。 (2) Pressure-sensitive adhesive layer The pressure-sensitive adhesive layer is provided on one side of the base material layer. The pressure-sensitive adhesive layer only needs to have adhesiveness to a stainless steel plate, which is a typical workpiece (work), such as a known rubber-based pressure-sensitive adhesive, acrylic pressure-sensitive adhesive, polyester-based pressure-sensitive adhesive, polyurethane-based pressure-sensitive adhesive, etc. Can be used. Among these, rubber adhesives and acrylic adhesives are preferable from the viewpoints of adhesion to metal plates, releasability, and cost. Rubber-based adhesives and acrylic-based adhesives are preferable because they have adhesiveness to metal plates and glass plates other than stainless steel plates.
　ゴム系粘着剤としては、例えば、天然ゴム系粘着剤、合成ゴム系粘着剤等が挙げられる。合成ゴム系粘着剤としては、ポリブタジエン；ポリイソプレン；ブチルゴム；ポリイソブチレン；スチレン・ブタジエン・スチレンブロック共重合体、スチレン・エチレン・ブチレン・スチレンブロック共重合体、スチレン・エチレン・ブチレンランダム共重合体等のスチレン系エラストマー；エチレンプロピレンゴム；プロピレンブテンゴム；エチレンプロピレンブテンゴム等が主成分として用いられる。 Examples of rubber adhesives include natural rubber adhesives and synthetic rubber adhesives. Synthetic rubber adhesives include polybutadiene; polyisoprene; butyl rubber; polyisobutylene; styrene / butadiene / styrene block copolymer, styrene / ethylene / butylene / styrene block copolymer, styrene / ethylene / butylene random copolymer, etc. Styrene elastomers; ethylene propylene rubber; propylene butene rubber; ethylene propylene butene rubber and the like are used as main components.
　アクリル系粘着剤としては例えば、ブチル（メタ）アクリレート、２－エチルヘキシル（メタ）アクリレートなどのアルキル（メタ）アクリレートを主成分とし、これに必要により共重合可能な改質用モノマーとして２－ヒドロキシエチル（メタ）アクリレートなどのヒドロキシル基含有モノマー、（メタ）アクリル酸などのカルボキシ基含有モノマー、スチレンなどのスチレン系モノマー、酢酸ビニルなどのビニルエステル類等の他のモノマーを加えたモノマー混合物の共重合体が用いられる。アクリル系粘着剤は溶液重合法、エマルション重合法、ＵＶ重合法などの慣用の重合法により得られる。 Examples of acrylic pressure-sensitive adhesives include alkyl (meth) acrylates such as butyl (meth) acrylate and 2-ethylhexyl (meth) acrylate as main components, and 2-hydroxyethyl as a modifying monomer that can be copolymerized therewith if necessary. Copolymerization of monomer mixture with other monomers such as hydroxyl group-containing monomers such as (meth) acrylate, carboxy group-containing monomers such as (meth) acrylic acid, styrene monomers such as styrene, vinyl esters such as vinyl acetate Coalescence is used. The acrylic pressure-sensitive adhesive can be obtained by a conventional polymerization method such as a solution polymerization method, an emulsion polymerization method, or a UV polymerization method.
　必要に応じて、これら粘着剤の粘着特性の制御等を目的として、例えば、架橋剤、粘着付与剤、軟化剤、オレフィン系樹脂、シリコーン系ポリマー、液状アクリル系共重合体、リン酸エステル系化合物、老化防止剤、ヒンダードアミン系光安定剤等の光安定剤、紫外線吸収剤その他、例えば酸化カルシウムや酸化マグネシウムや炭酸カルシウム、シリカや酸化亜鉛、酸化チタンの如き充填剤や顔料などの適宜な添加剤を配合することができる。 If necessary, for the purpose of controlling the adhesive properties of these adhesives, for example, crosslinking agents, tackifiers, softeners, olefin resins, silicone polymers, liquid acrylic copolymers, phosphate ester compounds , Anti-aging agents, light stabilizers such as hindered amine light stabilizers, ultraviolet absorbers, and other suitable additives such as fillers and pigments such as calcium oxide, magnesium oxide, calcium carbonate, silica, zinc oxide, and titanium oxide Can be blended.
　粘着付与剤の配合は接着力の向上に有効であり、その配合量は、凝集力の低下による糊残り問題の発生を回避した接着力の向上などの点より、上述の粘着剤１００重量部当たり０～５０重量部が好ましく、より好ましくは０～３０重量部、特に好ましくは０～１０重量部である。ここで０重量部は、粘着付与剤を配合しないということである。 The compounding of the tackifier is effective for improving the adhesive strength, and the blending amount is based on the above-mentioned pressure-sensitive adhesive 100 parts by weight from the viewpoint of improving the adhesive force while avoiding the occurrence of the adhesive residue problem due to the decrease in cohesive force. The amount is preferably 0 to 50 parts by weight, more preferably 0 to 30 parts by weight, particularly preferably 0 to 10 parts by weight. Here, 0 part by weight means that no tackifier is blended.
　粘着付与剤としては、例えば、脂肪族系、芳香族系、脂肪族・芳香族共重合体系、脂環式系等の石油系樹脂、クマロンインデン系樹脂、テルペン系樹脂、テルペンフェノール系樹脂、重合ロジン系樹脂、（アルキル）フェノール系樹脂、キシレン系樹脂、並びに、これらの水素化物等の粘着剤分野で公知のものを適宜使用できる。また、粘着付与剤は１種又は２種以上用いることができる。 Examples of the tackifier include aliphatic resins, aromatic resins, aliphatic / aromatic copolymer systems, alicyclic petroleum resins, coumarone indene resins, terpene resins, terpene phenol resins, Polymerized rosin-based resins, (alkyl) phenol-based resins, xylene-based resins, and hydrides thereof can be appropriately used those known in the adhesive field. Moreover, 1 type (s) or 2 or more types can be used for a tackifier.
　粘着剤層の厚みは接着力などに応じて適宜設定でき、一般には１～３０μｍ、好ましくは２～２０μｍ、より好ましくは３～１５μｍである。粘着剤層は必要に応じて、実用に供されるまでの間、セパレータなどを仮着して保護することもできる。 The thickness of the pressure-sensitive adhesive layer can be appropriately set according to the adhesive force and the like, and is generally 1 to 30 μm, preferably 2 to 20 μm, more preferably 3 to 15 μm. If necessary, the pressure-sensitive adhesive layer can be temporarily attached with a separator or the like until it is put to practical use.
（３）表面保護シート
　表面保護シートの形成は、例えば、溶剤に粘着剤組成物を溶解してなる溶液や粘着剤組成物の熱溶融液を基材に塗布する方法、セパレータ上に粘着剤層を形成した後に基材に移着する方法、粘着剤層を形成するための材料を基材上に押出成形塗布する方法、基材と粘着剤層を二層もしくは多層にて共押出しする方法、基材上に粘着剤層をラミネートする方法、ラミネート層と共に粘着剤層を基材上に二層ラミネートする方法、粘着剤層と、基材やラミネート層等とを、二層又は多層ラミネートする方法などの、公知の粘着シートの形成方法に準じて行うことができる。 (3) Surface protective sheet The surface protective sheet can be formed by, for example, applying a solution obtained by dissolving the adhesive composition in a solvent or a hot melt of the adhesive composition to the substrate, or an adhesive layer on the separator. A method of transferring to a base material after forming, a method of extrusion-coating a material for forming a pressure-sensitive adhesive layer on the base material, a method of co-extrusion of the base material and the pressure-sensitive adhesive layer in two or multiple layers, A method of laminating an adhesive layer on a substrate, a method of laminating an adhesive layer together with a laminate layer on a substrate, a method of laminating an adhesive layer and a substrate, a laminate layer, etc. It can carry out according to the formation method of well-known adhesive sheets.
　本発明において、表面保護シートは、離型層を備えていてもよい。離型層を形成するための剥離剤としては、溶剤型や無溶剤型のシリコーン系ポリマーや長鎖アルキル系ポリマー（長鎖アルキル基を有するポリマー）が一般的である。具体的には、ピーロイル（一方社油脂社製、長鎖アルキル系ポリマー）、信越シリコーン（信越化学工業社製、シリコーン系ポリマー）等が入手可能である。離型層の形成方法としては、例えばグラビアロール等のロールコーターによる塗布方法やスプレー等による噴霧方法など公知の塗工方法を取り入れることができる。 In the present invention, the surface protective sheet may include a release layer. As the release agent for forming the release layer, solvent-type or solvent-free type silicone polymers and long-chain alkyl polymers (polymers having long-chain alkyl groups) are generally used. Specifically, pyroyl (manufactured by Yushi Co., Ltd., long-chain alkyl polymer), Shin-Etsu Silicone (manufactured by Shin-Etsu Chemical Co., Ltd., silicone-based polymer) and the like are available. As a method for forming the release layer, a known coating method such as a coating method using a roll coater such as a gravure roll or a spraying method using spray or the like can be adopted.
　本発明の表面保護シートは、破断伸びが２５０％以上である。破断伸びが２５０％以上のシートは、被加工材（ワーク）に貼付され、被加工材（ワーク）に曲げ加工等の機械加工が施された際に、破れることなく被加工材（ワーク）の変形に追従し、被加工材（ワーク）の表面保護が確実に成される。破断伸びは好ましくは３００％以上であり、より好ましくは４００％以上である。破断伸びの上限は特に限定はされないが、１５００％以下が好ましく、１２００％以下がより好ましい。 The surface protective sheet of the present invention has a breaking elongation of 250% or more. A sheet having a breaking elongation of 250% or more is affixed to a workpiece (work), and when the workpiece (work) is subjected to mechanical processing such as bending, the workpiece (work) is not torn. Following the deformation, the surface protection of the workpiece (work) is ensured. The elongation at break is preferably 300% or more, more preferably 400% or more. The upper limit of elongation at break is not particularly limited, but is preferably 1500% or less, and more preferably 1200% or less.
　なお、破断伸びとは、シートの破断後における標点間の長さの、力をかける前の標点間の長さに対する百分率である。本発明において、シートの破断伸びは、後述の方法に従って測定される。 The elongation at break is a percentage of the length between the gauge points after the sheet breaks with respect to the length between the gauge points before the force is applied. In the present invention, the breaking elongation of the sheet is measured according to the method described later.
　以下、本発明の表面保護シートの用途について説明する。
　図１は本発明の表面保護シートがレーザー切断加工に供される被加工材に貼付して使用される態様を示している。表面保護シート１はレーザービーム６の照射により切断加工されるワーク（被加工材）２のレーザービームの照射面に貼付される。図１に示す装置では、レーザービーム６は、加工ヘッド３の集光レンズ３１で集光された後、ノズル４からワーク２に照射される。但し、本発明ではレーザービームの発生装置は図示されたものに限定されない。レーザービーム６は、通常、炭酸ガスレーザーであるが、ＹＡＧレーザー、ファイバーレーザー等であってもよい。ノズル４からは、レーザービーム６と共に、アシストガス７が０．５～１．５ＭＰａ程度の高圧でワーク２に吹きつけられる。このアシストガス７は、ガスボンベなどといったガス供給手段５から、導入管５１およびガス導入口４１を経由して供給される。このアシストガス７は、ワーク２の材質及び要求される切断面品質に応じて各種ガスが使い分けられるが、典型的には、窒素ガスや空気などが用いられる。 Hereinafter, the use of the surface protective sheet of the present invention will be described.
FIG. 1 shows an embodiment in which the surface protective sheet of the present invention is used by being attached to a workpiece to be subjected to laser cutting. The surface protection sheet 1 is affixed to a laser beam irradiation surface of a workpiece (workpiece) 2 to be cut by laser beam 6 irradiation. In the apparatus shown in FIG. 1, the laser beam 6 is condensed by the condenser lens 31 of the processing head 3 and then irradiated to the workpiece 2 from the nozzle 4. However, in the present invention, the laser beam generator is not limited to the illustrated one. The laser beam 6 is usually a carbon dioxide laser, but may be a YAG laser, a fiber laser, or the like. From the nozzle 4, the assist gas 7 is sprayed onto the work 2 together with the laser beam 6 at a high pressure of about 0.5 to 1.5 MPa. The assist gas 7 is supplied from a gas supply means 5 such as a gas cylinder through an introduction pipe 51 and a gas introduction port 41. The assist gas 7 can be selected from various gases depending on the material of the workpiece 2 and the required cut surface quality. Typically, nitrogen gas or air is used.
　ワーク（被加工材）２は、金属板、塗装した金属板、アルミサッシ、樹脂板、化粧銅板、塩化ビニルラミネート鋼板、ガラス板等などが挙げられる。 Examples of the workpiece (work material) 2 include a metal plate, a painted metal plate, an aluminum sash, a resin plate, a decorative copper plate, a vinyl chloride laminated steel plate, a glass plate, and the like.
　レーザービーム６を照射することによる切断加工は、ワーク（被加工材）２の片側からレーザービーム６を照射して照射した側の反対側にまで貫く切断部分を形成して、ワーク２の少なくとも一部を切り離す加工であり、ワーク２の一部を除去する加工であってもよいし、大きなワークを複数の小片へと切り分ける加工であってもよい。本発明の表面保護シート１は、このような切断加工に際して、ワーク（被加工材）２のレーザービーム照射面に貼付するためのものである。言い換えれば、本発明の表面保護シート１をワーク（被加工材）２に貼付したままの状態で、表面保護シート１の側から表面保護シート１を介してワーク２にレーザービーム６が照射されて切断加工がなされる。かかるレーザー切断加工の間、表面保護シート１によってワーク（被加工材）２の表面の汚損が防止される。 Cutting by irradiating the laser beam 6 is performed by forming a cutting portion penetrating from one side of the workpiece (workpiece) 2 to the side opposite to the side irradiated with the laser beam 6 and irradiating at least one of the workpieces 2. It is the process which cuts off a part, The process which removes a part of workpiece | work 2 may be sufficient, and the process which cuts a big workpiece | work into several small pieces may be sufficient. The surface protective sheet 1 of the present invention is for sticking to a laser beam irradiation surface of a workpiece (workpiece) 2 in such a cutting process. In other words, the workpiece 2 is irradiated with the laser beam 6 from the surface protective sheet 1 side through the surface protective sheet 1 while the surface protective sheet 1 of the present invention is stuck on the workpiece (workpiece) 2. Cutting is performed. During such laser cutting processing, the surface protection sheet 1 prevents the surface of the workpiece (workpiece) 2 from being soiled.
　レーザー切断加工後のワーク（被加工材）に対して曲げ加工が施され、例えば、ワーク（被加工材）が金属板や塗装した金属板の際には、通常、Ｖ型のダイの上にワークをセットし、その上からパンチで押して任意の角度にワークを変形させる。その際、本発明の表面保護シートはワークの変形に追従して伸長することからワークに密着した状態を維持し、ワークの表面保護が安定になされる。 For example, when the workpiece (workpiece) is a metal plate or a painted metal plate, it is usually placed on a V-shaped die. Set the workpiece and press it with a punch to deform the workpiece to an arbitrary angle. At that time, since the surface protective sheet of the present invention extends following the deformation of the workpiece, the surface protective sheet is kept in close contact with the workpiece, and the surface protection of the workpiece is stabilized.
実施例１
　Ｔダイ法にて成形された厚み４０μｍのポリプロピレン・ポリエチレンブレンドフィルム（ポリプロピレン：ポリエチレン（重量比）＝８０：２０）の片面にコロナ処理をし、そのコロナ処理面に離型処理剤として長鎖アルキル系ポリマーの剥離剤（一方社油脂工業（株）製、ピーロイル１０１０）を塗布して、８０℃×１分で乾燥した後、フィルムの剥離剤による離型処理をしていない面に粘着剤としてポリイソブチレン（ＢＡＳＦ製、Ｏｐｐａｎｏｌ　Ｂ８０）を乾燥後の厚みが１４μｍになるように塗布し、８０℃×２分で乾燥して、表面保護シートを得た。 Example 1
A single-sided polypropylene / polyethylene blend film (polypropylene: polyethylene (weight ratio) = 80: 20) formed by the T-die method is corona-treated, and the corona-treated surface has a long-chain alkyl as a release treatment agent. As a pressure-sensitive adhesive on the surface of the film that has not been subjected to a release treatment with a release agent after applying a release agent of a polymer (on the other hand, Oily Industries Co., Ltd., Pyroyl 1010) and drying at 80 ° C. for 1 minute. Polyisobutylene (manufactured by BASF, Opanol B80) was applied so that the thickness after drying was 14 μm, and dried at 80 ° C. for 2 minutes to obtain a surface protective sheet.
実施例２
　実施例１において、粘着剤層に下記のアクリル系粘着剤を適用し、粘着剤層の厚みを５μｍとし、離型処理をせず、コロナ処理面に直接粘着剤層を形成した以外は実施例１と同様にして表面保護シートを得た。 Example 2
In Example 1, the following acrylic pressure-sensitive adhesive was applied to the pressure-sensitive adhesive layer, the thickness of the pressure-sensitive adhesive layer was set to 5 μm, the mold release treatment was not performed, and the pressure-sensitive adhesive layer was directly formed on the corona-treated surface. In the same manner as in No. 1, a surface protective sheet was obtained.
＜アクリル系粘着剤＞
　通常の溶液重合により得た、アクリル酸２－エチルヘキシル／エチルアクリレート／メタクリル酸メチル／メタクリル酸２－ヒドロキシエチル＝３０／７０／５／４（重量比）の共重合組成からなるアクリル系ポリマー（アクリル系ポリマーＡ）１００重量部と、ブチルアクリレート／アクリル酸＝１００／５（重量比）の共重合組成からなるアクリル系ポリマー（アクリル系ポリマーＢ）３重量部とをブレンドし、さらにアクリル系ポリマーＡ１００重量部に対して３．５重量部のイソシアネート系架橋剤（日本ポリウレタン工業（株）製、コロネートＬ）を加えて粘着剤組成物とした。 <Acrylic adhesive>
Acrylic polymer (acrylic) having a copolymer composition of 2-ethylhexyl acrylate / ethyl acrylate / methyl methacrylate / 2-hydroxyethyl methacrylate = 30/70/5/4 (weight ratio) obtained by ordinary solution polymerization 100 parts by weight of polymer A) and 3 parts by weight of an acrylic polymer (acrylic polymer B) having a copolymer composition of butyl acrylate / acrylic acid = 100/5 (weight ratio), and further acrylic polymer A100 3.5 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., Coronate L) was added with respect to parts by weight to obtain a pressure-sensitive adhesive composition.
実施例３
　実施例２において、粘着剤層の厚みを１０μｍとした以外は実施例２と同様にして表面保護シートを得た。 Example 3
In Example 2, a surface protective sheet was obtained in the same manner as in Example 2 except that the thickness of the pressure-sensitive adhesive layer was 10 μm.
実施例４
　基材をＴダイ法にて得た厚み４０μｍのＬＬＤＰＥフィルムに変更し、該フィルムのコロナ処理面に粘着剤層を形成した以外は実施例３と同様にして表面保護シートを得た。 Example 4
A surface protective sheet was obtained in the same manner as in Example 3 except that the base material was changed to an LLDPE film having a thickness of 40 μm obtained by the T-die method and an adhesive layer was formed on the corona-treated surface of the film.
実施例５
　基材をインフレーション法にて得た厚み５０μｍのＬＬＤＰＥフィルムに変更し、該フィルムのコロナ処理面に粘着剤層を形成した以外は実施例３と同様にして表面保護シートを得た。 Example 5
A surface protective sheet was obtained in the same manner as in Example 3 except that the base material was changed to an LLDPE film having a thickness of 50 μm obtained by the inflation method and an adhesive layer was formed on the corona-treated surface of the film.
実施例６
　基材をインフレーション法にて得た厚み６０μｍのＬＤＰＥフィルムに変更し、該フィルムのコロナ処理面に粘着剤層を形成した以外は実施例３と同様にして表面保護シートを得た。 Example 6
A surface protective sheet was obtained in the same manner as in Example 3 except that the base material was changed to an LDPE film having a thickness of 60 μm obtained by the inflation method, and an adhesive layer was formed on the corona-treated surface of the film.
比較例１
　基材の厚みを９０μｍにし、粘着剤層に下記の粘着剤を適用し、基材のコロナ処理面に厚みを１５μｍの粘着剤層を形成した以外は実施例６と同様にして表面保護シートを得た。 Comparative Example 1
A surface protective sheet was prepared in the same manner as in Example 6 except that the thickness of the base material was 90 μm, the following pressure-sensitive adhesive was applied to the pressure-sensitive adhesive layer, and a pressure-sensitive adhesive layer having a thickness of 15 μm was formed on the corona-treated surface of the base material. Obtained.
＜天然ゴム系粘着剤＞
　天然ゴム１００重量部に対し、タッキファイア（Ｅａｓｔｍａｎ　Ｃｈｅｍｉｃａｌ製、Ｐｉｃｃｏｔａｃ　１１００－Ｅ）７０重量部、イソシアネート系架橋剤（Ｂａｙｅｒ製、Ｄｅｓｍｏｄｕｒ　ＲＦＥ）１重量部を加えて粘着剤組成物とした。 <Natural rubber adhesive>
Tackifier (manufactured by Eastman Chemical, Piccotac 1100-E) 70 parts by weight and isocyanate crosslinking agent (manufactured by Bayer, Desmodur RFE) 1 part by weight were added to 100 parts by weight of natural rubber to obtain an adhesive composition.
比較例２
　基材をインフレーション法にて得た厚み１００μｍのＬＤＰＥフィルムに変更し、該フィルムのコロナ処理面に厚み１０μｍの粘着剤層を形成した以外は実施例１と同様にして表面保護シートを得た。 Comparative Example 2
A surface protective sheet was obtained in the same manner as in Example 1 except that the base material was changed to an LDPE film having a thickness of 100 μm obtained by the inflation method, and an adhesive layer having a thickness of 10 μm was formed on the corona-treated surface of the film.
比較例３
　基材の厚みを１００μｍ、粘着剤層の厚みを５μｍに変更した以外は実施例６と同様にして表面保護シートを得た。　 Comparative Example 3
A surface protective sheet was obtained in the same manner as in Example 6 except that the thickness of the base material was changed to 100 μm and the thickness of the pressure-sensitive adhesive layer was changed to 5 μm.
比較例４
　粘着剤層の厚みを１０μｍに変更した以外は比較例３と同様にして表面保護シートを得た。 Comparative Example 4
A surface protective sheet was obtained in the same manner as in Comparative Example 3 except that the thickness of the pressure-sensitive adhesive layer was changed to 10 μm.
　実施例および比較例で作製した表面保護シートについて以下の評価試験を行った。 The following evaluation tests were conducted on the surface protective sheets produced in the examples and comparative examples.
（１）残渣
　トルエンを染み込ませたウエスで表面を拭いた１．５ｍｍ厚のＳＵＳ３０４２Ｂ板の当該表面に表面保護シートをラミネータ（線圧４０Ｎ／ｃｍ、速度３ｍ／ｍｉｎ）で貼り合わせ、３０分以上放置した後に、炭酸ガスレーザー装置（トルンプ（株）製、ＴｒｕＬａｓｅｒ３０３０）にて、レーザービームを照射しつつ、８ｍ／ｍｉｎの速度でＳＵＳ３０４２Ｂ板を直線に切断をした。そして、切断後のテープを剥離し、切り始めを除いた切断端部の保護シート残渣の有無を目視にて確認し、以下の評価をした。
　評価基準：○は保護シート残渣なし、×は保護シート残渣あり。 (1) Residue A surface protective sheet is bonded to the surface of a 1.5 mm thick SUS3042B plate wiped with a waste impregnated with toluene with a laminator (linear pressure 40 N / cm, speed 3 m / min) for 30 minutes or more. After standing, the SUS3042B plate was cut into a straight line at a rate of 8 m / min while irradiating a laser beam with a carbon dioxide laser device (TruLaser 3030 manufactured by Trumpf Co., Ltd.). And the tape after a cutting | disconnection was peeled, the presence or absence of the protection sheet residue of the cutting | disconnection edge part except the start of cutting was confirmed visually, and the following evaluation was performed.
Evaluation criteria: ○ indicates no protective sheet residue, × indicates protective sheet residue.
（２）曲げ加工
　トルエンを染み込ませたウエスで表面を拭いた０．６ｍｍ厚のＳＵＳ３０４２Ｂ板に表面保護シートをラミネータ（線圧４０Ｎ／ｃｍ、速度３ｍ／ｍｉｎ）で貼り合わせ、３０分以上放置した後、表面保護シート側が凸になるように９０°曲げ加工を行った。
　評価基準：○は基材破れなし、×は基材破れあり。 (2) Bending process A surface protective sheet was bonded to a 0.6 mm thick SUS3042B board wiped with a waste cloth soaked with toluene with a laminator (linear pressure 40 N / cm, speed 3 m / min) and left for 30 minutes or more. Then, 90 degree | times bending was performed so that the surface protection sheet side might become convex.
Evaluation criteria: ○ indicates that the substrate is not broken, and × indicates that the substrate is broken.
（３）表面護シートの破断伸び
　シートを平滑なガラス板上でトリミングナイフ（刃は１回使用で交換）を使用して１０ｍｍ幅にカットし、引張試験機でチャック間距離５０ｍｍ、引張速度０．３ｍ／ｍｉｎの条件で引張試験を行い、シートが破断したときを伸びとした。なお、引張試験は２３℃で、シートの縦方向（ＭＤ：Machine Direction）のみについて行った。 (3) Breaking elongation of the surface protection sheet The sheet is cut to a width of 10 mm on a smooth glass plate using a trimming knife (blade is exchanged once use), the distance between chucks is 50 mm, and the tensile speed is 0 with a tensile tester. A tensile test was performed under the condition of 3 m / min, and the elongation was defined as the time when the sheet broke. The tensile test was performed at 23 ° C. only in the machine direction (MD) of the sheet.
　下記表１に実施例および比較例で作製した表面保護シートの構成と試験結果を示す。 Table 1 below shows the structure and test results of the surface protective sheets prepared in the examples and comparative examples.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
１　表面保護シート
２　ワーク
３　加工ヘッド
３１　集光レンズ
４　ノズル
４１　ガス導入口
５　ガス供給手段
５１　導入管
６　レーザービーム
７　アシストガス DESCRIPTION OF SYMBOLS 1 Surface protection sheet 2 Work piece 3 Processing head 31 Condensing lens 4 Nozzle 41 Gas introduction port 5 Gas supply means 51 Introduction pipe 6 Laser beam 7 Assist gas
　本出願は、日本に出願された特願２０１２－０６２３８８を基礎としており、その内容は本明細書に全て包含される。 This application is based on Japanese Patent Application No. 2012-062388 filed in Japan, the contents of which are incorporated in full herein.

Claims (5)

  1. 　レーザー切断加工に供され、さらに曲げ加工に供される被加工材のレーザービーム照射面に貼付される表面保護シートであって、
    　基材と、該基材の片面に設けられた粘着剤層とを有し、
    　基材の厚みが１０～６０μｍであり、当該シートの破断伸びが２５０％以上であることを特徴とする、表面保護シート。     It is a surface protection sheet that is subjected to laser cutting and is further affixed to the laser beam irradiated surface of the workpiece to be bent,
    A substrate and a pressure-sensitive adhesive layer provided on one side of the substrate;
    A surface protective sheet, wherein the thickness of the substrate is 10 to 60 μm, and the breaking elongation of the sheet is 250% or more.
  2. 　基材がポリオレフィン系基材である、請求項１記載の表面保護シート。 The surface protective sheet according to claim 1, wherein the substrate is a polyolefin-based substrate.
  3. 　被加工材が金属板である、請求項１または２記載の表面保護シート。 The surface protective sheet according to claim 1 or 2, wherein the workpiece is a metal plate.
  4. 　レーザー切断加工が、アシストガスの供給下にレーザービームを被加工材に照射して被加工材の切断がなされるレーザー切断加工である、請求項１～３のいずれか一項記載の表面保護シート。 The surface protection sheet according to any one of claims 1 to 3, wherein the laser cutting process is a laser cutting process in which a workpiece is cut by irradiating the workpiece with a laser beam under supply of an assist gas. .
  5. 　被加工材のレーザービーム照射面に表面保護シートを貼付し、該表面保護シートを介して被加工材にレーザービームを照射して被加工材をレーザー切断加工し、さらに該被加工材に曲げ加工を行う加工方法であって、
    　前記表面保護シートが、基材と、該基材の片面に設けられた粘着剤層とを有し、
    　該基材の厚みが１０～６０μｍであり、当該シートの破断伸びが２５０％以上であることを特徴とする、加工方法。     A surface protection sheet is affixed to the laser beam irradiation surface of the workpiece, the workpiece is irradiated with a laser beam via the surface protection sheet, the workpiece is laser cut, and further bent into the workpiece. A processing method for performing
    The surface protection sheet has a base material and an adhesive layer provided on one side of the base material,
    A processing method, wherein the thickness of the substrate is 10 to 60 μm, and the elongation at break of the sheet is 250% or more.
PCT/JP2013/057545 2012-03-19 2013-03-15 Surface protective sheet WO2013141178A1 (en)

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