JP2006082049A - Method and apparatus for manufacturing transparent layer for optical data recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a transparent layer for an optical data recording medium capable of preventing a base from being pasted up on a pass roller at the time of feed, and a manufacturing method therefor. <P>SOLUTION: In a manufacturing method of the transparent layer for the optical data recording medium by feeding a base becoming a base material film to form a hard coating layer on the base, and the manufacturing apparatus therefor, the base is supported by a pass roller having fluorine coating applied to its surface in a feed route wherein a coating member is brought into contact with the base to coat the same with a composition constituting the the hard coating layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for producing a transparent layer for an optical information recording medium, and specifically, a production method for forming a base film used for a transparent layer of an optical information recording medium by applying a hard coat layer. And a manufacturing apparatus.

  Currently, in order to support the recording of digital high-vision TV broadcasts, research on optical information recording media that enable higher-density recording than high-density optical information recording media (DVD) is underway. And optical disk systems using high NA (Numerical Aperture) pickups have been developed.

  As such an optical disk system, for example, there is a next-generation optical disk standard called a blue-ray disk. A blue ray disc is an optical information recording medium having a recording layer on a substrate and a transparent layer on the laser incident side of the recording layer. For example, as shown in Patent Document 1 below, the transparent layer is formed by applying a hard coat layer for preventing scratches to the surface of a light transmission layer made of polycarbonate.

  As a method for forming the transparent layer, for example, an ultraviolet curable material for forming a hard coat layer on a base by an application member while a polycarbonate base used as a base film of the transparent layer is conveyed by a driving roller. There is a method in which a composition is applied, dried, and then cured by ultraviolet irradiation.

JP 2000-67468 A

  By the way, conventionally, when a base made of polycarbonate or the like is transported when forming transparency, the surface of the base is very smooth, and therefore the base sticks to the surface of the pass roller provided in the transport path during transport. A phenomenon may occur. Then, there is room for improvement in that the base is not smoothly transported by being pulled in the transport direction in a state where the base is attached to the pass roller, and wrinkles called buckling are generated in the base.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a manufacturing method and a manufacturing apparatus of a transparent layer for an optical information recording medium capable of preventing a base from sticking to a pass roller during transportation. is there.

  The above object of the present invention is a method for producing a transparent layer for an optical information recording medium, in which a base to be a base film is transported and a hard coat layer is formed on the base. An optical information recording medium characterized in that the base is supported by a pass roller having a surface coated with fluorine coating in a transport path from the time when a coating member is brought into contact with the base and the composition constituting the hard coat layer is applied. This is achieved by a method for producing a transparent layer for use.

  Another object of the present invention is a transparent layer manufacturing apparatus for an optical information recording medium, which transports a base serving as a base film and forms a hard coat layer on the base, after the base is sent out. A path roller that supports the base to be transported is provided in a transport path from the time when an application member is brought into contact with the base to apply the composition constituting the hard coat layer, and the surface of the pass roller is coated with fluorine. This is achieved by an apparatus for producing a transparent layer for an optical information recording medium.

  According to the present invention, since the surface of the pass roller is coated with fluorine, it is possible to prevent the transported base from sticking to the pass roller during application. For this reason, a base can be conveyed smoothly and it can prevent that a buckling arises in a base.

  In the transparent layer manufacturing method and manufacturing apparatus, it is preferable that the pass roller has conductivity. In this way, it is possible to prevent foreign matter from adhering to the pass roller due to static electricity, and to prevent foreign matter from being transferred from the pass roller to the base during transport of the base.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method and manufacturing apparatus of the transparent layer for optical information recording media which can prevent a base sticking to a pass roller at the time of conveyance can be provided.

  The optical information recording medium referred to in the present invention is an information recording medium capable of reproducing an information signal by optical means. The optical information recording medium of the present invention basically comprises a substrate, a recording layer, and a transparent layer. Further, in the optical information recording medium, these constituent elements may be interchanged or combined with each other within a range not hindering the content of the invention. In an optical information recording medium, it is necessary that at least one of these components be present, but each may be present in a plurality of layers, and each layer is composed of a plurality of layers having different compositions and properties. May be. In addition to the above layers, the optical information recording medium may be provided with an antistatic layer, a lubricating layer, a protective layer, a reflective layer, and the like. Further, label printing may be performed on the opposite side of the substrate from the recording layer.

  The optical information recording medium has, for example, a disk shape, and dimensions such as a diameter are not limited. The optical information recording medium may be configured to be housed and held in a cartridge housing.

  The transparent layer has a function of guiding light irradiated for recording / reproduction to the recording layer, and also has a function of protecting the recording layer chemically and mechanically. In the present invention, “transparent” means that the light transmittance is 70% or more, preferably 85% or more with respect to the wavelength of light of an optical means used for recording and reproduction (for example, 600 nm to 800 nm or 350 nm to 450 nm). means. The cover layer has a transmittance of 90% to 92%.

  The transparent layer has a base film (translucent film), a hard coat layer for preventing scratches is provided on the surface, and appropriately includes an adhesive layer and an antifouling layer. be able to. As the base film, for example, polycarbonate, triacetyl cellulose (TAC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide, or polyamide can be used.

The hard coat layer is formed by applying and drying an ultraviolet curable composition that is cured by irradiation with active energy rays, preferably ultraviolet rays, on the substrate film, and then curing the composition by irradiation with ultraviolet rays.
In the ultraviolet curable composition, a compound containing two or more ethylenically unsaturated groups in the same molecule which is polymerized or cross-linked by ultraviolet irradiation and cured is preferably used.

  The thickness of the hard coat layer is preferably 1.0 μm to 10.0 μm, more preferably 2.0 μm to 6.0 μm, and particularly preferably 2.5 μm to 5.0 μm.

  The pencil hardness of the hard coat layer is preferably B or more, and more preferably H or more. The pencil hardness here refers to a pencil whose scratches are not recognized at a load of 9.8 N according to the pencil hardness evaluation method specified by JIS-K-5400 using a test pencil specified by JIS-S-6006. It can be determined as hardness.

Embodiments of a transparent layer manufacturing method and a manufacturing apparatus according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a diagram for explaining the configuration of a manufacturing apparatus for manufacturing a transparent layer for an optical information recording medium according to the present invention.
As shown in FIG. 1, the transparent layer manufacturing apparatus 10 includes a base fabric (bulk) 1 formed by winding a base B made of polycarbonate, and a winding roll 6 that winds and holds the base B. In this configuration, the base B is conveyed by being sent from the base material 1 to the take-up roll 6. The thickness of the base B is 80 μm to 100 μm.

  The manufacturing apparatus 10 includes a coating unit 2, a pull roll 3, a drying unit 4, and an ultraviolet irradiation unit 5 in order along the transport direction of the base B.

  The application unit 2 is provided with an application member 13 connected to an application liquid supply unit (not shown). The coating member 13 causes the coating liquid supplied from the coating liquid supply unit to adhere to the wire bar 14 that functions as a coating nozzle, rotates the wire bar 14, and presses the wire bar 14 against the surface of the base B to thereby apply the coating liquid. Is applied. The application unit 2 of the present embodiment is configured to wrap the wire bar 14 on the base B in a state where the base B is not supported by a backup roller or the like. On the other hand, in a mechanism that supports the base B with a backup roller, such as a slide coater or a curtain coater, the transport path length of the base B hardly changes. For this reason, this invention can acquire a remarkable effect especially in the manufacturing apparatus which has the application part 2 of the structure which wraps the wire bar 14 to the base B in the state which is not supported by the backup roller etc. In this embodiment, the coating member 13 is moved up and down so that it is wrapped on the base B. However, the pass rollers 11 and 12 provided on the upstream side and the downstream side in the conveying direction of the wire bar 14 are moved up and down. It is good also as a structure wrapped by the base B by doing.

  The application member 13 is a movable member so that it can be arbitrarily set to a position where the wire bar 14 is pressed against the base B (a position where the wire bar 14 is wrapped) and a position where the wire bar 14 is separated from the base B. In the manufacturing apparatus 10 of the present embodiment, the configuration is such that the wire bar 14 is pressed against the base B by moving the coating member 13 during coating, and the wire bar 14 is spaced apart from the base B except during coating. It is.

  In this embodiment, as an example of the coating solution, a solvent such as isopropyl alcohol (IPA), methyl ethyl ketone (MEK), methyl ethyl butyl ketone (MIBK), Si particles, an ultraviolet curable resin, and a polymerization initiator are used. A composition consisting of

  The pull roll 3 is a roll that is rotationally driven at the time of application and serves as a reference for the transport speed of the base B when the base B is transported in contact with the base B on its peripheral surface. The pull roll 3 is controlled by a pull roll control unit (not shown) and transports the base B at a constant speed. The pull roll 3 may have a configuration in which a groove is provided on the surface in order to secure a holding force with respect to the base B, or a configuration in which the base B is sucked and held by sucking air.

  The drying unit 4 is configured to dry the coating liquid applied to the base B while transporting the base B.

  The ultraviolet irradiation unit 5 is configured to irradiate the surface of the base B on which the coating liquid is applied with ultraviolet rays and cure the coating layer while the base B is being conveyed. Here, the ultraviolet irradiation unit 5 may be configured to irradiate light of active energy other than ultraviolet rays as long as the coating liquid can be cured.

In the present embodiment, the surface of a pass roller (pass roller 11 in FIG. 1) provided on the transport path from the base B 1 to the wire bar 14 of the coating member 13 after the base B is fed from the base 1 is coated with fluorine. ing. Although not shown in FIG. 1, when one or a plurality of other pass rollers are arranged on the upstream side in the conveying direction of the wire bar 14, the surface of these pass rollers is coated with fluorine.
Here, the target to be coated with fluorine is a pass roller provided on the transport path from the base B to the wire bar 14 of the coating member 13 after the base B is sent out, because the base surface before coating is very smooth. This is because it sticks to the pass roller due to a certain reason. Specifically, the laminated surface on which the hard coat layer is laminated in the base is not so smooth as compared with the base surface before transport, so that the phenomenon of sticking to the pass roller does not occur.

The pass roller with fluorine coating in the present invention means a pass roller having a fluororesin applied on its surface. Examples of the fluororesin include polytetrafluoroethylene (PTFE), tetrafluoroethylene perfluoroalkyl vinyl ether copolymer (PFA), perfluoroethylene-propylene copolymer (FEP), and ethylene-tetrafluoroethylene copolymer. (ETFE), polychlorotrifluoroethylene (PCTFE), and ethylene-chlorotrifluoroethylene copolymer (ECTFE).
In addition, the pass roller with a fluorine coating referred to in the present invention may be a pass roller with a Teflon (registered trademark) coat.

  According to the present invention, since the surface of the pass roller is coated with fluorine, it is possible to prevent the transported base B from sticking to the pass roller during application. For this reason, base B can be conveyed smoothly and it can prevent that buckling arises in base B.

  Moreover, it is preferable that the pass roller to which the fluorine coat is applied has conductivity. In this way, it is possible to prevent foreign matter from adhering to the pass roller due to static electricity, and it is possible to prevent foreign matter from being transferred from the pass roller to the base B during transport of the base B. An example of a pass roller that is coated with fluorine and has conductivity is a product model number NF-015HEC manufactured by Nippon Fuso Kogyo Co., Ltd.

It is a figure explaining the structure of the manufacturing apparatus which manufactures the transparent layer for optical information recording media based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base raw material 2 Application | coating part 3 Pull roller 4 Drying part 5 Ultraviolet irradiation part 6 Winding roll 10 Manufacturing apparatus 11 (12 of transparent layer for optical information recording media) Pass roller 13 Application | coating member

Claims (4)

A method for producing a transparent layer for an optical information recording medium, comprising transporting a base to be a base film and forming a hard coat layer on the base,
The base is supported by a pass roller whose surface is coated with a fluorine coating in a transport path from when the base is fed out until the coating member is brought into contact with the base and the composition constituting the hard coat layer is applied. A method for producing a transparent layer for an optical information recording medium.   The method for producing a transparent layer for an optical information recording medium according to claim 1, wherein the pass roller has conductivity. An apparatus for producing a transparent layer for an optical information recording medium, which transports a base to be a base film and forms a hard coat layer on the base,
A path roller that supports the base to be transported is provided in a transport path from when the base is sent out to when the composition constituting the hard coat layer is applied by bringing an application member into contact with the base, and on the surface of the pass roller. An apparatus for producing a transparent layer for an optical information recording medium, wherein a fluorine coating is applied.   The said pass roller has electroconductivity, The manufacturing apparatus of the transparent layer for optical information recording media of Claim 3 characterized by the above-mentioned.

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