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JP-2026075101-A - Film with adhesive layer

JP2026075101AJP 2026075101 AJP2026075101 AJP 2026075101AJP-2026075101-A

Abstract

[Problem] To provide a method for manufacturing a wound body of adhesive-coated film without a release liner that enables long-length winding while suppressing the entrapment of air bubbles, the occurrence of wrinkles, and the occurrence of dents. To provide a wound body of adhesive-coated film without a release liner that suppresses the entrapment of air bubbles, the occurrence of wrinkles, and dents. [Solution] A method for manufacturing a winding from a long adhesive-coated film, wherein the adhesive-coated film has a release layer, a specific substrate, and a specific adhesive layer in that order, and the adhesive-coated film is wound onto the winding shaft via a touch roll positioned in front of the winding shaft to form a winding. The touch pressure P of the touch roll is 3.6 N/cm < P < 14.0 N/cm as a linear pressure. [Selection Diagram] Figure 1

Inventors

  • 宇都宮 達也
  • 半田 至
  • 品川 雅

Assignees

  • 日東電工株式会社

Dates

Publication Date
20260507
Application Date
20260203

Claims (11)

  1. A method for manufacturing a winding from a long adhesive-coated film, The adhesive-coated film has a release layer, a substrate, and an adhesive layer in this order. The release layer and the adhesive layer are the outermost layers of the adhesive-coated film. The base material contains a polyester resin, The adhesive layer is a urethane-based adhesive layer composed of a urethane-based adhesive, The thickness of the adhesive layer is 4.0 μm to 10.0 μm. The adhesive-coated film is wound onto the winding shaft via a touch roll positioned in front of the winding shaft to form a wound body. The touch pressure P of the touch roll is defined as a linear pressure of 3.6 N/cm < P < 14.0 N/cm That is, A method for manufacturing a wound body of film with an adhesive layer.
  2. The touch pressure P of the aforementioned touch roll is defined as a linear pressure of 4.3 N/cm < P < 10.0 N/cm A method for manufacturing a wound body of an adhesive-coated film according to claim 1, wherein m is m.
  3. The product of the thickness D of the substrate and the touch pressure P is 0.018N < (D × P) < 0.050 A method for manufacturing a wound body of an adhesive-coated film according to claim 1, wherein N is the case.
  4. A method for manufacturing a wound body of an adhesive-coated film according to claim 1, wherein the surface hardness S of the touch roll is 30° < S < 80°.
  5. The winding tension T of the adhesive-coated film on the winding shaft is 200 N/m < T < 400 N/m The method for manufacturing a wound body of an adhesive-coated film according to claim 1.
  6. A method for manufacturing a wound body of an adhesive-coated film according to claim 1, wherein, at a temperature of 23°C and a humidity of 50% RH, the low-speed peeling force of the adhesive layer relative to the release layer, measured at a peeling speed of 0.3 m/min and a peeling angle of 180 degrees, is less than 0.01 N/25 mm.
  7. A method for manufacturing a wound body of an adhesive-coated film according to claim 1, wherein, at a temperature of 23°C and a humidity of 50% RH, the high-speed peeling force of the adhesive layer relative to the release layer, measured at a peeling speed of 30 m/min and a peeling angle of 180 degrees, is less than 0.15 N/25 mm.
  8. A method for manufacturing a winding of an adhesive-coated film according to claim 1, wherein the winding length of the winding body is 3,000 m or more.
  9. A rolled body of a long adhesive-coated film, The adhesive-coated film has a release layer, a substrate, and an adhesive layer in this order. The release layer and the adhesive layer are the outermost layers of the adhesive-coated film. The base material contains a polyester resin, The adhesive layer is a urethane-based adhesive layer composed of a urethane-based adhesive, The thickness of the adhesive layer is 4.0 μm to 10.0 μm. Under conditions of 23°C and 50% RH humidity, the low-speed peeling force of the adhesive layer relative to the release layer, measured at a peeling speed of 0.3 m/min and a peeling angle of 180 degrees, is less than 0.01 N/25 mm. A rolled body of film with an adhesive layer.
  10. The rolled body of the adhesive-coated film according to claim 9, wherein, at a temperature of 23°C and a humidity of 50% RH, the high-speed peeling force of the adhesive layer relative to the release layer, measured at a peeling speed of 30 m/min and a peeling angle of 180 degrees, is less than 0.15 N/25 mm.
  11. A winding of an adhesive-coated film according to claim 9, wherein the winding length is 3000 m or more.

Description

This invention relates to a film with an adhesive layer. In the manufacturing process of optical and electronic components, surface protection films (SPVs) are typically applied to prevent damage to the surface of the components during processing, assembly, inspection, and transportation. Surface protection films typically have a laminated structure comprising a substrate and an adhesive layer. Conventionally, surface protection films typically have a release liner on the exposed side of the adhesive layer. Numerous surface protection films having the substrate, adhesive layer, and release liner in this order have been reported. On the other hand, as a surface protective film, for reasons such as reducing the cost of the release liner, Recently, there has been a demand for surface protection films that do not have a release liner on the exposed side of the adhesive layer. As such a surface protection film, a surface protection film in which a polyethylene-based film and an adhesive layer are laminated has been reported (Patent Document 1). This surface protection film is manufactured by extrusion molding, and by embossing the back surface of the polyethylene-based film, it becomes possible to wind and unwind it without a release liner, and it can be provided as a wound body. However, polyethylene films tend to contain lumps of unmelted resin (fisheyes), which can lead to problems such as reduced inspectability in the manufacturing process of optical and electronic components, and deterioration of product quality. In addition, because polyethylene films have an embossed surface on the back, they can cause dents on the substrate when laminated. Recently, a surface protection film has been reported that does not have a release liner and does not use a polyethylene-based film as a base material, and that can be wound up and unwound without a release liner (Patent Document 2). Japanese Patent Application Publication No. 06-033022Japanese Patent Publication No. 2022-112659 This is a schematic diagram illustrating one embodiment of a winding device that can be used in a method for manufacturing a winded body of an adhesive-coated film according to an embodiment of the present invention. Where the term "weight" appears in this specification, it may be interpreted as "mass," which is the commonly used SI unit for indicating weight. ≪≪1. Film with adhesive layer≫≫ The method for manufacturing a wound body of adhesive-coated film according to an embodiment of the present invention is a method for manufacturing a wound body from a long length of adhesive-coated film. A film with an adhesive layer has a release layer, a substrate, and an adhesive layer in that order. In a film with an adhesive layer, the release layer and the adhesive layer are the outermost layers of the film. As long as a film with an adhesive layer has a release layer, a substrate, and an adhesive layer in that order, and the release layer and the adhesive layer are the outermost layers of the film, it may include any other suitable layer as long as it does not impair the effects of the present invention. Since the adhesive-coated film does not have a separator on the side of the adhesive layer opposite the substrate, the cost of the separator can be reduced, and the separator peeling process can be omitted. Adhesive-coated films can be used in a variety of applications. Typical examples include surface protection films and carrier sheets used to protect the surface of optical and electronic components (such as glass, polarizers, waveplates, phase difference plates, optical compensation films, reflective sheets, brightness-enhancing films, and transparent conductive films used in liquid crystal displays) from scratches during processing, assembly, inspection, and transportation. The base material contains a polyester resin. By including a polyester resin in the base material, the effects of the present invention can be more fully realized, and in particular, the conventional problems that arise when polyethylene film is used as the base material can be resolved. The adhesive layer is a urethane-based adhesive layer composed of a urethane-based adhesive. The effects of the present invention can be more fully realized by having an adhesive layer composed of a urethane-based adhesive. Furthermore, having an adhesive layer composed of a urethane-based adhesive can suppress problems such as the generation of adhesive residue during processing. In films with an adhesive layer, the thickness of the adhesive layer is typically 4.0 μm to 10.0 μm. The value is m. By adjusting the thickness of the adhesive layer to within the above range, the effects of the present invention can be more fully realized. If the thickness of the adhesive layer is too small and outside the above range, for example, when manufacturing a winding from the adhesive-coated film, there is a risk of dents caused by foreign matter, etc. If the thickness of the adhesive layer is too large a