JP2010030741A - Web carrying method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily carry an easy-to-break and eacy-to-damage web with a web surface having no contact with a roll surface in a section along a travel supporting roll while changing the direction thereof. <P>SOLUTION: In a section where the web 1 travels along the travel supporting roll 2, the web travels with the web surface 1a having no contact with the roll surface 2a in a state that a liquid film 3a having a thickness greater than a combination of web surface roughness and roll surface roughness is laid between the roll surface 2a and the web surface 1a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a web transport method and a transport apparatus for transporting a web having a fragile surface and a fragile surface mainly while being brought into contact with a roll having a metal or rubber surface.

  When transporting a web with a fragile surface or a fragile surface when transporting a web such as plastic film, paper, or metal foil, the web surface may be run with a protective film for protecting the surface. In a traveling portion that supports the side and changes direction, the web surface is often transported by using an air floating support device called an air turn bar without causing the web surface to contact.

  For example, in a printing machine or a coating machine for a web, when transporting a web immediately after printing ink or coating liquid is applied, the surface coated with the coating liquid is not brought into contact with the turn bar. A web is levitated and conveyed using an air levitating traveling support device (see, for example, Patent Document 1).

However, the support device such as the air floating type air turn bar may be difficult to implement in the process of coating or the like because it may be difficult to carry out the web traveling, and it is costly by providing a complicated mechanism as the air turn bar. There was a problem such as becoming high.
JP 2003-326210 A

  The present invention has been made in view of the above, and in the case where a web having a surface that is easily broken and easily damaged is traveled along a roll such as a metal roll or a rubber roll and conveyed, the web is provided between the roll surface and the web surface. It is intended to provide a web transport method and apparatus capable of avoiding direct contact by interposing a liquid such as water and easily transporting and turning the web surface without damaging the web surface.

  The present invention has been made to solve the above-described problems, and the web transport method according to the first aspect of the present invention includes a roll surface, a web surface, and a web surface at a portion where the web travels along a travel support roll. A liquid film is interposed between the web surfaces and the web surface is run without contacting the roll surface. Thereby, even a web having a surface that is easily broken and easily damaged can be transported without damaging the surface.

  In the web transport method, a liquid film having a thickness larger than the combined roughness of the web surface roughness and the roll surface roughness is interposed between the roll surface and the web surface. Thereby, it can be made to drive | work in the state which floated from the roll surface so that a web surface might not contact a roll surface directly.

  Further, in the web transport method, the roll having the liquid film attached to the surface thereof is rotated so that the liquid film is interposed between the roll surface and the web surface.

  Further, the web transport device of the present invention is provided with a liquid applying means for applying a liquid to the surface of the roll in a portion where the web having a fragile and easily damaged surface travels along the traveling support roll, A liquid film on the roll surface applied and adhered by the liquid applying means is interposed between the web surface and the web surface so that the web surface runs without contacting the roll surface. Thereby, the method of this invention can be implemented favorably.

  In the web transport device, as the liquid application unit, a liquid tank that stores liquid is provided under the traveling support roll, the lower side of the roll is immersed in the liquid in the liquid tank, and the roll By rotating corresponding to the web running, the liquid film adhered to the roll surface can be fed between the roll surface and the web surface. Further, as the liquid applying means, means for spraying liquid on the surface of the traveling support roll may be provided.

  The liquid is made of a liquid that does not affect the web surface and can be evaporated or separated without leaving a solid content. Accordingly, the web surface can be transported and transported without damaging the web surface in a state where the web surface is lifted from the roll surface without affecting the web surface in terms of alteration or deformation.

  According to the web transport method and transport apparatus of the present invention described above, it is possible to avoid a travel support roll having a surface of metal, rubber or the like from coming into direct contact with the web surface, and to interpose a liquid film on the roll surface. Therefore, it can be transported easily while being lifted from the roll surface, and the direction can be easily changed. For this reason, restrictions on the layout of the travel support roll in the web conveyance can be avoided, and the mechanism and structure thereof are relatively simple, so a conventional air-floating travel support device such as an air turn bar is used. Compared to the case, the cost is greatly reduced.

  Next, embodiments of the present invention will be described based on examples shown in the drawings.

  FIG. 1 is a schematic view of a main part showing one embodiment of the present invention, FIG. 2 is a schematic view showing another embodiment of the present invention, and FIG. 3 is a sectional explanatory view of the present invention.

  In the figure, reference numeral 1 denotes a web such as a plastic film or paper having a fragile surface to be transported, a fragile surface, and a printing ink or a coating liquid is applied to the surface 1a in a printing machine or a coating machine, for example. In the web immediately after, the surface 1a is easily damaged due to the application surface of the printing ink or coating liquid.

  Reference numeral 2 denotes a running support roll disposed so as to come into contact with the surface 1a for the conveyance and direction change of the web 1, and in the case of the embodiment shown in FIG. It is provided so that it may convey while changing direction by running along the upper part side of 2 outer peripheral surfaces. The running support roll 2 is made of a metal roll having a metal surface such as stainless steel or chrome plating, or a non-metal roll having a non-metal surface such as rubber or synthetic resin. The running support roll 2 is provided, for example, so as to be driven to rotate mainly at the same speed in the same direction as the running direction of the web 1, and the roll 2 is supported for free rotation so that the web 1 can run. You may provide so that it may be accompanied and rotated.

  In the case of the present invention, the liquid film 3a is provided between the roll surface 2a and the web surface 1a by applying a liquid 3 such as water to the surface 2a of the traveling support roll 2 by an appropriate liquid applying means. Is provided so that the web surface 1a can be run without contacting the roll surface 2a. The liquid film 3a interposed as described above varies depending on the viscosity of the liquid, etc., but has a thickness that is several times or more of the combined roughness of the web surface roughness and roll surface roughness, more preferably three or more times the combined roughness. The web surface 1a is not brought into contact with the roll surface 2a.

  In the case of the embodiment shown in FIG. 1, as the liquid applying means, a liquid tank 4 for storing the liquid 3 is provided below the axial center of the traveling support roll 1. The lower side of the roll 2 is dipped in the liquid 3, and the roll 2 in the dipped state is rotated to send the liquid film 3a adhering to the roll surface 2a in a film shape to the upper side. The roll surface 2a and the web surface The liquid film 3a is interposed between the roll surface 2a and the web surface 1a.

  In addition to the above, the liquid applying means can be implemented by various structures that can apply liquid between the roll surface 2a and the web surface 1a. For example, as shown in FIG. On the other hand, means 5 such as a spray or a nozzle for spraying liquid over the entire width of the web can be provided. As the liquid application means, the liquid may be applied by spraying directly between the roll surface 2a and the web surface 1a. Depending on the type of the web 1 or the like, the liquid may be applied to the web surface 1a. May be provided.

  Further, as the liquid application means, the traveling support roll is formed of a hollow roll body having a large number of minute holes in the peripheral wall, and is provided so that liquid can be supplied to the inside of the roll body. It is also possible to adopt a configuration in which the supplied liquid is applied to the roll surface through the micropores (not shown).

  In any case, as the liquid 3 interposed between the roll surface 2a and the web surface 1a, in addition to water such as tap water, alcohol or oil, depending on the type of the web 1 to be transported, Various liquids such as solvents can be used, but in particular, they do not affect the surface 1a of the web 1 to be conveyed, such as alteration or deformation, and evaporate or disappear easily without leaving solids. A liquid such as water that can be separated into water is preferably used.

  Due to the configuration of the conveying device as described above, the surface 2a of the roll 2 and the surface 1a of the web 1 in the portion along which the web 1 to be conveyed is along the traveling support roll 2 for the purpose of changing the direction, Since the liquid film 3a is interposed between the web 1 and the web 1, the web 1 travels without coming into direct contact with the roll surface 2a in a state where it floats with respect to the roll surface 2a. The flying height h of the web 1 due to the liquid film 3a is larger than when the liquid film is not provided. Therefore, even if the web 1 has a surface 1a which is easily damaged, such as a coating surface immediately after application of printing ink or coating liquid, the liquid film 3a serves as a cushion to prevent the web surface 1a from being damaged. it can.

  In particular, when two surfaces with roughness face each other, if there is a distance more than three times the combined roughness of the two, the two surfaces are not in contact with each other even if they are air layers. In the case of the invention, the liquid film 3a having a higher viscosity than the air layer as described above can have a sufficient thickness with respect to the synthetic roughness, and the web surface 1a is in contact with the roll surface 2a. Can be surely prevented. Moreover, since the liquid film 3a has pressure resistance unlike the air layer, the web surface 1a does not come into contact with the roll surface 2a even if the traveling web 1 vibrates or the tension changes.

  Therefore, even a web having a surface that is fragile and easily damaged can be moved and conveyed without contacting the roll surface, and the direction can be easily changed. In addition, restrictions on the layout of the travel support roll in the web conveyance can be avoided, and the mechanism and structure are relatively simple. When using a conventional air-floating travel support device such as an air turn bar, etc. Compared with, the cost will be greatly reduced.

  The web transport device of the present invention transports a web having a fragile and easily damaged surface, for example, when transporting a web immediately after printing ink or coating liquid is applied in a printing machine or coating machine for the web. Can be suitably used.

It is the schematic of the principal part which shows one Example of this invention. It is the schematic which shows another Example of this invention. It is a section explanatory view of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Web, 1a ... Web surface, 2 ... Roll for driving support, 2a ... Roll surface, 3 ... Liquid, 3a ... Liquid film, 4 ... Liquid tank, 5 ... Means to spray liquid.

Claims (7)

  In the part where the web runs along the roll for running support, a liquid film is interposed between the roll surface and the web surface, and the web is run without contacting the web surface to the roll surface. Method.   The web conveyance method according to claim 1, wherein a liquid film having a thickness larger than a combined roughness of the web surface roughness and the roll surface roughness is interposed between the roll surface and the web surface.   The web conveying method according to claim 1 or 2, wherein a roll having a liquid film attached to the surface thereof is rotated so that the liquid film is interposed between the roll surface and the web surface.   In a portion where the web travels along the roll for running support, liquid application means for applying liquid to the surface of the roll is provided, and a liquid film on the roll surface applied and adhered by the liquid application means is provided between the web surface A web conveying apparatus characterized in that the web surface travels without being brought into contact with the roll surface.   As the liquid application means, a liquid tank for storing liquid is provided under the running support roll, the lower side of the roll is immersed in the liquid in the liquid tank, and the roll rotates corresponding to the web running. The web conveyance device according to claim 4, wherein the liquid film attached to the roll surface is fed between the roll surface and the web surface.   The web conveyance device according to claim 4, wherein a means for spraying liquid onto a surface of the traveling support roll is provided as the liquid application means.   The web transport device according to any one of claims 4 to 6, wherein the liquid is made of a liquid that does not affect the web surface and can be evaporated or separated without leaving a solid content.

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