JP2016188121A - Take-up method of vapor deposited film roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vapor deposited film roll having a satisfactory rolled-up posture without causing deterioration of gas barrier performance in a method of taking up vapor deposited film, on which various thin film such as metal and metallic oxide is formed on a plastic film surface, by applying pressure from a contact pressure roll.SOLUTION: In a take-up method of a vapor deposited film roll, vapor deposited film is wound like a roll under pressure from a contact pressure roll. The contact pressure roll is alternately coated with two kinds of rubber materials having different hardness, at a constant interval into a double helical shape, and a front surface of the contact pressure roll is made to have a flat finish.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for winding a vapor deposition film roll, and more specifically, the vapor deposition film can be rolled up without causing wrinkles or winding deviations, and the mechanical breakage of the vapor deposition layer in the winding process is suppressed. The present invention relates to a method for winding a vapor-deposited film roll that does not deteriorate the performance.

  Vapor-deposited films with various thin films such as metals and metal oxides formed on the surface of plastic films are widely used in various applications such as electrical appliances, electronic equipment, and building materials, as well as packaging applications such as food, pharmaceuticals, and industrial products. ing. The required properties such as adhesion, light shielding properties, transparency, conductivity, and bending resistance differ depending on the use of the vapor deposition film, but a property commonly required in many applications is gas barrier performance.

  Since the vapor deposition film is required to be suitable for various coatings, printing, laminating and the like, the film roll is required to have a good winding shape without wrinkles. For this reason, a method using a roll whose rubber hardness decreases from the center to both ends as in Patent Document 1 as a contact pressure roll that presses the winding roll, or a spiral groove on the surface as in Patent Document 2 A method using a roll having a roll and a method of winding at an appropriate tension and high surface pressure has been implemented.

  The metal layer of the vapor deposition film and the vapor deposition layer of the metal oxide layer are very thin with a thickness of about 5 to 50 nm, and when a scratch or a crack occurs, the target gas barrier performance is greatly deteriorated. Depending on the high surface pressure from the contact pressure roll in the conventional winding method, there is a problem that scratches and cracks occur in the vapor deposition layer of the metal or metal oxide of the vapor deposition film and the gas barrier performance of the vapor deposition film deteriorates. .

JP 2000-229753 A JP 2005-170613 A

  An object of the present invention is a method for winding a vapor-deposited film in which various thin films such as metal and metal oxide are formed on the surface of a plastic film while pressing it with a contact pressure roll, without causing deterioration of gas barrier performance and winding. It is to provide a vapor deposition film roll having a good appearance.

  In order to achieve the above object, the present invention provides a method for winding a vapor deposition film roll, in which the vapor deposition film is wound into a roll while pressing the vapor deposition film with a pressure roll, and the two pressure rubbers having different hardnesses. A method for winding a vapor deposition film roll, characterized in that the material is a pressure-contact roll which is alternately covered with a double helical shape at regular intervals and has a flat surface.

  Furthermore, the present invention is characterized in that the pressure of the vapor deposition film roll by the contact pressure roll is in the range of 150 to 350 Pa.

  Furthermore, the present invention is characterized in that a difference in rubber hardness between the two types of rubber material portions of the contact pressure roll is 20 degrees or more.

  Further, the vapor deposition film is characterized in that a metal oxide layer is laminated on the surface of a plastic film.

  ADVANTAGE OF THE INVENTION According to this invention, a vapor deposition film roll without a wrinkle and a favorable winding form can be obtained, without deteriorating gas-barrier performance, when winding, applying a press to a winding film roll with a contact pressure roll.

It is the schematic which shows the winding method of this invention. It is the schematic which observed the winding method of this invention from the roll cross-section direction. It is the schematic which shows an example of the contact pressure roll in this invention.

  The present invention is a winding film roll winding method in which a vapor deposition film is wound into a roll while being pressed by a pressure contact roll, and the pressure contact roll has two kinds of rubber materials having different hardness alternately spaced at regular intervals. The contact pressure roll is coated in a double helical shape and has a flat finished surface.

  In general, when a film is taken up at a high speed in a roll shape, winding deviation may occur due to air being entrained between the film layers, and the winding shape may be deteriorated by winding the film as it is. In order to prevent this, the winding shape of the roll can be improved by pressing the winding portion of the film roll with a contact pressure roll to suppress air entrainment between the film layers and simultaneously stretching the wrinkle of the film. In the present invention, it is important to make the contact pressure roll specific.

  That is, the contact pressure roll in the present invention is a contact pressure roll in which two types of rubber materials having different hardnesses are alternately coated in a double helical shape at regular intervals, and the surface is finished flat. This contact pressure roll is a rubber roll in which a core metal is coated with a rubber material, and the rubber roll surface is characterized by comprising two kinds of rubber materials having different hardnesses. Two types of rubber material are alternately wound at regular intervals in a double-helical manner by centering the roll. As shown in FIG. 1, the double helical shape is a winding method in which the spiral direction is reversed on both sides with the central portion of the roll as a boundary. As shown in FIG. 1, two types of rubber materials having different hardnesses are alternately wound at regular intervals. Each rubber material has a width of 10 to 20 mm and a spiral angle of 30 to 45 degrees. It is attached.

  The rubber material for the purpose is selected according to the purpose from a very soft sponge-like material to a hard rubber, and two types of combinations are determined. For the purpose of the present invention, each material has a rubber hardness of 40 to 80. A degree within the range (compliance standard: Japan Rubber Association SRIS 0101) is preferable. If it exceeds 80 degrees, the deposited film of the deposited film tends to be broken, and if it is less than 40 degrees, it becomes hard in a short time or the surface is worn out during use, and the durability as a rubber roll becomes insufficient.

  As the rubber material for the contact pressure roll in the present invention, nitrile rubber, chloroprene rubber, urethane rubber, silicone rubber, ethylene / propylene rubber, isoprene rubber, butyl rubber, fluorine rubber, natural rubber, and the like can be used.

  In the present invention, it is important that there is a hardness difference between the two rubber materials. By providing a hardness difference between the spirally wound rubber materials, even if the pressure on the film roll is low, the film surface has improved gripping force, eliminating the entrainment air, The effect of stretching wrinkles can be expressed at the same time. For the purpose of the present invention, the difference in hardness between the two rubber materials is preferably 20 degrees or more (conforming standard: Japan Rubber Association SRIS 0101).

  As described above, the contact pressure roll in the present invention is finished by flattening the surface of the rubber material by scraping the surface of the rubber material after the two types of rubber material are wound around the mandrel and cured.

  In the winding method of the vapor deposition film roll of the present invention, the pressure of the vapor deposition film roll by the contact pressure roll is preferably in the range of 150 to 350 Pa. The pressing of the film roll is calculated by dividing the pressing force of the contact pressure roll by the contact area between the contact pressure roll and the film roll. When the pressure is less than 150 Pa, a sufficient effect of improving the winding shape may not be obtained, and when it exceeds 350 Pa, the gas barrier performance of the deposited film may be deteriorated. More preferably, it is the range of 150-250 Pa.

  The vapor deposition film in the present invention is obtained by laminating a metal layer or a metal oxide layer on a polyester film or a polyolefin film by vacuum vapor deposition. A biaxially oriented polyethylene terephthalate film is generally used as the polyester film, and a biaxially oriented or unstretched polypropylene film is often used as the polyolefin film. An aluminum layer is generally used as the metal layer, and aluminum oxide or silicon oxide, and a mixture thereof are often used as the metal oxide layer. In the case of aluminum which is a metal film, vapor deposition is performed at a thickness of about 30 to 50 nm in order to exhibit metallic luster, light blocking properties and gas barrier performance, and in the case of aluminum oxide which is a metal oxide, a thickness of about 10 nm. Vapor deposition is performed. The metal oxide film is thinner than the metal film, and the metal oxide film is more brittle and more fragile, so scratches and cracks are more likely to occur, and the deposited film with the metal oxide film laminated exhibits the effect of the present invention. it can.

  Of the conditions of the winding method in the present invention, if the winding speed is 100 m / min or more, winding can be performed with high productivity, and air entrainment and wrinkles between film layers can be efficiently eliminated. The effect of the invention appears remarkably. More preferably, it is 200 m / min or more.

  Of the conditions of the winding method according to the present invention, the winding tension is determined by the thickness and elastic modulus of the film. However, due to the effects of the present invention, the winding can be wound with a relatively low winding tension. . In the case of a 12 μm thick biaxially oriented polyethylene terephthalate film, a winding tension of 50 to 100 N / m is preferred.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not necessarily limited to these.

[Examples 1 to 12]
A transparent gas barrier film ("Barrier Rocks" (registered trademark) VM-PET1011HG, manufactured by Toray Film Processing Co., Ltd.) obtained by depositing aluminum oxide on a biaxially oriented polyethylene terephthalate film having a thickness of 12 µm and a width of 1000 mm is used as the contact pressure roll. 152 mm, surface length of 1100 mm, 11 mm wide White Elecon (manufactured by Meiwa Rubber Co., Ltd.) in the high rubber hardness part, and 10 mm wide softer Elecon (manufactured by Meiwa Rubber Co., Ltd.) in the low rubber hardness part Was wound at a tension of 80 N / m and a speed of 300 m / min. (Composite helical roll made by Meiwa Rubber Co., Ltd.). The following three types of contact pressure rolls were prepared, and combinations with the following pressing conditions were examined. The results are shown in Table 1.

[Pressure roll type]
(1) Hardness difference height: 20 degrees or more (2) Medium hardness difference: 11 to 19 degrees (3) Hardness difference low: 10 degrees or less Hardness measurement was performed by GS-701N manufactured by Teclock Co., Ltd. : Japan Rubber Association SRIS 0101).

[Pressing (Pa)]
(1) Ultra low pressure: less than 150 Pa (2) Low pressure: 150-250 Pa
(3) Medium pressure: 250 to 350 Pa
(4) High pressure: 350 to 450 Pa
For the pressure (Pa), the contact portion between the contact pressure roll and the film roll is observed from the roll axis direction, and the contact area (m ² ) is calculated from the length of the contact portion (nip width: m) and the film width (m). Calculate the pressure (N) for pressing the pressure roll by calculating the area and pressure of the pressure cylinder, the arm length, and the roll's own weight, and calculate the force (N) / contact area (m ² ) for pressing the pressure roll. did.

[Rolling appearance]
The winding appearance was determined according to the following criteria. Δ to ◎ are practically usable ranges.

◎: Vertical wrinkles 3 or less ○: Vertical wrinkles 4 to 10 △: Vertical wrinkles 11 to 15 ×: Vertical wrinkles 16 or more [Gas barrier performance retention effect]
The oxygen permeability of the deposited film before and after winding was measured, and judged by the gas barrier performance deterioration degree (%) calculated by the following formula. Δ to ◎ are in a practically usable range.

Barrier measuring device: MOCON oxygen permeability meter OX-TRAN2 / 21
Barrier measurement method: JIS K 7126 B method (isobaric method)
Deterioration degree of gas barrier performance (%) = {(oxygen transmission rate after rewinding / oxygen transmission rate before rewinding) -1} × 100 (%)
A: Less than 10% B: 10-30%
Δ: 30-50%
X: 50 to 100%

[Comparative example]
A normal rubber roll having a diameter of 152 mm, a surface length of 1100 mm, and a rubber hardness of 70 degrees was used as a contact pressure roll, and winding was performed at a tension of 80 N / m and a speed of 300 m / min. The results are shown in Table 2.

  In these comparative examples using ordinary rubber rolls, no winding condition was found and the winding condition was not found without deteriorating the gas barrier performance.

1: vapor deposition film 2: vapor deposition film roll 3: contact pressure roll 4: high rubber hardness portion 5: low rubber hardness portion

Claims (4)

A method for winding a vapor deposition film roll, in which the vapor deposition film is wound in a roll while being pressed with a pressure roll, and the pressure roll is composed of two types of rubber materials having different hardnesses alternately in a double helical shape at regular intervals. A method for winding a vapor-deposited film roll, characterized in that it is a pressure-contact roll that is coated with a flat surface. The method of winding a vapor deposition film roll according to claim 1, wherein the pressure of the vapor deposition film roll by the contact pressure roll is in a range of 150 to 350 Pa. The difference in rubber hardness between the two types of rubber material portions of the contact pressure roll is 20 degrees or more (conformity standard: Japan Rubber Association SRIS 0101), winding of the vapor deposition film roll according to claim 1 or 2 Method. The winding method of the vapor deposition film roll according to any one of claims 1 to 3, wherein the vapor deposition film is obtained by laminating a metal oxide layer on a surface of a plastic film.