JP2009119349A - Sheet coating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method which is conventionally made impossible by improving a conventional method. <P>SOLUTION: The sheet coating method includes: a coating material scraping step where a coating material is charged in a part surrounded by a coating roll 1 and a liquid pot 4 and the coating material 5 is scraped by a doctor 3; a coating material distribution step where the coating material is left in a groove part on the coating roll and the coating material is hardly left in an external part; a gap adjusting step where a gap between the coating roll and a backup roll 2 is adjusted by a handle; a pressure applying step where pressure is applied to the gap by a spring or a pneumatic pressure-hydraulic pressure cylinder; a coating film forming step where a uniform coating film is formed on the surface of a material to be coated; a peripheral speed controlling step of controlling the passing speed of the material to be coated while increasing or variably changing the peripheral speed of the coating roll compared to the peripheral speed of the backup roll; and a material-to-be-coated rotating step of left-rotating the material to be coated when the material to be coated advances from right to left. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improved invention of the applicant of the present application, and relates to a method of applying a relatively high viscosity paint to a material to be coated such as a sheet of paper or a metal plate.

  In general, UV curable resin coatings are 300C. P. A material having a viscosity higher than S and suitable for processing the back side of paper is 300 C.I. P. It was thought impossible to achieve a low viscosity below S.

  In particular, when a paint having a relatively high viscosity is applied to a sheet with a natural roll coater, unevenness due to vertical stripes substantially parallel to the traveling direction occurs, and a smooth painted surface cannot be obtained. Therefore, if a reverse roll coater is used, paint will be placed on the surface of the sheet from the coating roll, so the natural roll coater can eliminate the vertical streaks that occur during coating, but the viscosity of UV curable resin paints, etc. If the coating is high, the paint will run out if it is not thickly applied, and if the surface of the coating roll is not made highly accurate, a smooth coating surface will not be obtained and the coating roll will be expensive, and it will be difficult to control the rotation speed of the roll. There was a problem.

In order to solve these problems, the applicant of the present application developed and disclosed a “painting apparatus” disclosed in Japanese Utility Model Publication No. 62-23571.
In this conventional coating apparatus, a relatively high viscosity paint is applied to a material to be coated such as a sheet by using a natural roll coater, and then the material to be coated is made of a reverse type metal. By passing between the removal roll and the rubber receiving roll, the extra paint applied to the material to be coated can be removed, so that the paint with relatively high viscosity can be applied easily and smoothly. The purpose is to provide the apparatus at a lower cost than a reverse roll coater. Specific examples will be described below.

  In FIG. 2, reference numeral 1 denotes a roll coater, and 2 denotes a paint removing mechanism disposed in front of the sheet 3 of the roll coater 1 in the traveling direction, that is, on the carry-out side. The roll coater 1 includes a metal squeeze roll 4 that has been plated and a coating reservoir 6 formed above the outer peripheral portion of a rubber coating roll 5 having at least an outer peripheral surface made of rubber. The metal receiving rolls 7 are provided facing each other, and both the coating roll 5 and the receiving roll 7 rotate counterclockwise and clockwise so that they are in the traveling direction of the sheet 3 (right side in the figure). Natural type. The paint removing mechanism 2 is of a reverse type in which a rubber receiving roll 9 is installed below the metal paint removing roll 8 that has been plated, and both the removing roll 8 and the receiving roll 9 rotate clockwise. ing. In the figure, 10, 11 and 12 are doctors of the kaki roll 4, the receiving roll 7 and the removing roll 8, 13 is a solvent tank for removing the paint of the receiving roll 7, and 14 is the paint removed by the removing roll 9.

  Next, to explain the operation of the coating apparatus configured as described above, the printed sheet 3 is passed between the rotating application roll 5 and the receiving roll 7 of the roll coater 1, A natural UV curable resin coating is applied to the printing surface of the sheet 3. Thereafter, the sheet 3 is passed between the removal roll 8 and the receiving roll 9 of the paint removal mechanism 2, and an excess portion of the paint applied by the roll coater 1 is removed by the metal removal roll 8, The vertical stripes of the paint applied to the leaf paper 3 are eliminated, and the coated surface is smoothed. Thereafter, the printing surface of the sheet 3 is polished by a conventionally known means.

  This device is a roll coater with a rubber coating roll and a metal receiving roll rotating in the direction of travel of the material to be coated, that is, a natural type roll coater. After coating, the sheet is passed between a metal paint removal roll that rotates in the direction opposite to the direction of the material to be coated and a rubber receiving roll, and a part of the paint applied by the roll coater is removed. Even if there are vertical stripes in the paint applied with a natural type roll coater, the smooth coating surface coating film is removed by using the paint removal mechanism in which the removal roll and the receiving roll face each other. Thin coating can be performed, and the consumption of paint can be reduced compared to the one applied only with the reverse roll coater described above, and the accuracy of rolls such as coating rolls is also low. There is an effect that it provides relatively low cost even with paint removing mechanism for good, occurs rarely been used in the current then many problems.

  Compared with such a three-roll direct coater of a conventional coating machine, it is possible to use a high-viscosity paint that could not be painted because it wraps around paper, and it is also possible to paint thin paper I did it. Further, compared with a three-roll coater or a claw coater-type coater, it is possible to form a clean coating film without roll eyes and to determine the coating amount according to the size of the groove. That is, the problem to be solved by the present invention is that when the coating roll is coated with a similar structure without a groove, a liquid pool is formed at the leading end of the paper and a product cannot be made. It is intended to solve the liquid reservoir at the tip of the paper by creating a groove and scraping the liquid off the surface of the roll with a doctor.

  The present invention is an improvement of a conventional sheet coating method developed by the applicant in order to solve the above-described problems, and has a relatively high viscosity for a material to be coated such as a sheet or a metal plate. A method of applying a paint, comprising a rubber backup roll that rotates in the direction of travel of the material to be coated and a roll coater that is placed facing a metal coating roll, the coating roll being in the direction of paper travel The present invention provides a sheet coating method characterized in that it rotates counterclockwise and the backup roll is rotated along the direction of travel to enable high-viscosity coating that cannot be applied by winding the paper. In the sheet paper coating method, a paint scraping process in which a paint is put into a part surrounded by a coating roll and a liquid tank and the paint is scraped off by a doctor, and a groove part of the coating roll is applied. Paint distribution process that leaves almost no paint on the outer shape, and the object to be coated fed by the feed roll is transported between the coating roll and the backup roll, and the distance between the coating roll and the backup roll is handled by the handle. An interval adjustment step to adjust, a pressure operation step to make the interval smaller than the thickness of the object to be coated and a spring pressure or a pneumatic / hydraulic cylinder to work, and a passage between the coating roll and the backup roll A coating film forming process for forming a uniform coating film on the surface of the object to be coated; the passing speed of the object to be coated is substantially equal to the peripheral speed of the backup roll; and the peripheral speed of the coating roll is increased from the peripheral speed of the backup roll. A peripheral speed adjusting step of changing the coating roll speed relative to the backup roll; The direction of rotation of Nguroru and the backup roll when the object to be coated advances from right to left is to provide a made of a material to be coated rotates process sheet coating method to counterclockwise rotation.

The present invention relates to a method of applying a relatively high viscosity paint to a material to be coated such as a sheet or a metal plate, the rubber backup roll and the metal coating roll rotating in the traveling direction of the material to be coated The coating roll rotates in the direction of paper travel and the backup roll rotates in the direction of travel so that it cannot be painted due to paper wrapping. This is a sheet-paper coating method characterized in that it can be used for painting, and in the above-mentioned sheet-paper coating method, a paint is put into a portion surrounded by a coating roll and a liquid tank, and the paint is scraped off by a doctor. A scraping process, a paint distribution process that leaves paint in the groove part of the coating roll and hardly leaves paint in the outer part, and an object to be coated fed by a feed roll An interval adjusting process for conveying between the coating roll and the backup roll and adjusting the interval between the coating roll and the backup roll with the handle, and making the interval smaller than the thickness of the object to be coated and the pressure of the spring or the air pressure / hydraulic pressure A pressure actuating step for allowing the cylinder to work, a coating film forming step for forming a uniform coating film on the surface of the object to be coated that has passed between the coating roll and the backup roll, and a passing speed of the object to be coated. A peripheral speed adjusting step of making the peripheral speed of the backup roll substantially equal to the peripheral speed of the backup roll and increasing the peripheral speed of the coating roll from the peripheral speed of the backup roll and further changing the coating roll relative to the backup roll; Rotate the object to be rotated counterclockwise when the object is moving from right to left. Because it is Sobutsu rotating step comprising a sheet coating method, a number of advantages, such as: which can not be obtained by conventional sheet coating method can be obtained.
A. Compared with the conventional three-roll direct coater, it is possible to use a high-viscosity paint that cannot be applied because the paper is wrapped around the paper, and a thinner paper can be applied.
B. Compared with a three-roll coater or a claw-capping type coater, a clean coating film without roll eyes can be formed.
C. Furthermore, the amount of application depends on the size of the groove.
D. A liquid reservoir at the front end of the paper can be solved by forming a groove on the surface of the roll and scraping the liquid off the surface of the roll with a doctor.

  The best embodiment of the present invention is a method for applying a relatively high viscosity coating material to a material to be coated such as a sheet or a metal plate, and is a rubber backup roll that rotates in the traveling direction of the material to be coated And a roll coater installed opposite to the metal coating roll, the coating roll rotates against the paper traveling direction, and the backup roll rotates along the traveling direction to prevent coating by winding the paper. It is a sheet coating method characterized by enabling the use of high-viscosity coating, and in the above-mentioned sheet coating method, paint is put in a part surrounded by a coating roll and a liquid tank with a doctor. A paint scraping process for scraping off the paint, a paint distribution process for leaving the paint in the groove part of the coating roll and leaving almost no paint in the outer part, and a feeding roll. An interval adjusting process for conveying the coated object between the coating roll and the backup roll and adjusting the distance between the coating roll and the backup roll with a handle; A pressure actuating step for causing the pressure or pneumatic / hydraulic cylinder to work, a coating film forming step for forming a uniform coating film on the surface of the object to be coated that has passed between the coating roll and the backup roll; A peripheral speed adjusting step in which the passing speed of the coating is approximately equal to the peripheral speed of the backup roll, the peripheral speed of the coating roll is decelerated from the peripheral speed of the backup roll, and the coating roll is variable with respect to the backup roll; When the workpiece advances from the right to the left in the rotation direction of the roll and backup roll Because it is made of a material to be coated rotates process sheet coating method of the rotation, it has become possible to obtain a high-quality products which can not be obtained by conventional sheet coating method.

  The present invention is an improvement of a utility model developed and disclosed by the applicant of the present application (see Japanese Utility Model Publication No. 59-24386), and improves upon the point where it was impossible to obtain a conventional coating method at all. . Accordingly, since the basic coating apparatus itself and the method of implementing the same are not different from the conventional ones, the improved part will be described here.

  In FIG. 1, reference numeral 1 denotes a coating roll, and the material is made of hard chrome plating or a ceramic material, and a concave groove is carved. The paint is put in the part surrounded by the coating roll 1 and the liquid tank 4 and the paint is scraped off by the doctor 3, while the paint is left in the groove part of the coating roll 1, but the paint is almost entirely in the outer part. Does not remain. Further, the object to be coated fed by the feed roll 11 is carried between the coating roll 1 and the backup roll 2, and the interval between the coating roll 1 and the backup roll 2 is determined by the interval adjusting handle 5. This interval is narrower than the thickness of the object to be coated so that the force of the spring 6 works. A uniform coating film is formed on the surface of the object to be coated that has passed between the coating roll 1 and the backup roll 2. Although the passing speed of the object to be coated is substantially equal to the peripheral speed of the backup roll 2, the coating roll 1 cannot be applied cleanly unless it is faster than the peripheral speed of the backup roll 2. The coating roll 1 has a mechanism capable of variable speed relative to the backup roll 2. This is to find the optimum ratio according to the size of the groove, the nature of the paint and the viscosity. Further, the amount of application hardly changes even when the peripheral speed of the coating roll 1 is changed, and is determined by the size of the groove. In addition, as shown in FIG. 2, the rotation direction of the coating roll 1 and the backup roll 2 is comprised so that it may rotate counterclockwise when a to-be-coated object advances from the right to the left.

BRIEF DESCRIPTION OF THE DRAWINGS The outline mechanism figure which showed the coating machine for sheet paper of this invention. The general | schematic mechanism figure which showed the conventional coating apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating roll 2 Backup roll 3 Doctor 4 Liquid 5 Paint 6 Feed roll 11 Roll coater 12 Paint removal mechanism 13 Sheet paper 14 Paper roll 15 Coating roll 16 Paint reservoir 17, 19 Receiving roll 18 Paint removal roll 20 Doctor 24 Removal roll

Claims (2)

A method of applying a relatively high viscosity paint to a material to be coated such as a sheet of paper or a metal plate, wherein a rubber backup roll and a metal coating roll rotating in the traveling direction of the material to be coated are opposed to each other. The coating roll rotates against the paper traveling direction, and the backup roll rotates along the traveling direction to enable high-viscosity coating that cannot be applied by winding the paper. A sheet paper coating method characterized by the fact that In the sheet paper coating method described in the previous section, a paint scraping process in which a paint is put into a portion surrounded by a coating roll and a liquid tank and the paint is scraped off by a doctor, a paint is left in a groove portion of the coating roll, and an outer portion is formed A paint distribution process that leaves almost no paint, an interval adjustment process that conveys the object to be coated sent by the feed roll between the coating roll and the backup roll, and adjusts the distance between the coating roll and the backup roll with the handle; A pressure actuating process in which the interval is made smaller than the thickness of the object to be coated and the pressure of a spring or a pneumatic / hydraulic cylinder is applied, and the surface of the object to be coated that has passed between the coating roll and the backup roll is uniform. Coating film forming process for forming a coating film, and the passing speed of the object to be coated is substantially equal to the peripheral speed of the backup roll. The peripheral speed of the coating roll is increased from the peripheral speed of the backup roll, and the peripheral speed adjustment process for changing the speed of the coating roll relative to the backup roll. 2. The sheet coating method according to claim 1, further comprising a rotation step of rotating the object to be rotated to the left when proceeding to the left.

Images