Device and method for applying a liquid to sheet-shaped materials

Abstract

[Problems to be Solved] The present invention provides a method and a device for applying a plurality of zigzag patterns on a sheet-shaped substrate with a liquid such as a hot-melt adhesive, which can (1) prevent fluctuation in the amplitude of the coated pattern, (2) maintain good stability of the coated pattern, (3) improve the cutoff of the liquid when stopping the supply of liquid, and (4) improve the intermittence of the coated pattern. [Means of Solving the Problem] A device for applying a liquid such as an adhesive 31 on a substrate 14 such as long sheet-shaped materials traveling at high speed, said device consisting of a valve mechanism 15 which starts and stops the supply of a liquid, at least two liquid-discharge ports 16 which discharge a liquid fed through the valve mechanism, two seam air-discharge ports 10 g provided at both sides of the liquid-discharge port 16 the direction of which intersects the travel direction of the substrate, two supplementary air-discharge ports 10 k provided very close to each liquid-discharge port and at both sides of the liquid-discharge port, and at least a partition wall 17 positioned between adjacent liquid-discharge ports that protrudes downward by a prescribed length.

1 . Device for applying a liquid on sheet-shaped materials, which is a device for applying a liquid such as an adhesive on a substrate such as long sheet-shaped materials traveling at high speed, characterized in that said device consists of 
 (a) a valve mechanism which can start and stop the feeding of a liquid,    (b) at least two liquid-discharge ports which discharge the liquid fed through the valve mechanism and which are adjacent to the direction of crossing the travel direction of the substrate,    (c) two seam air discharge ports arranged on both sides of each liquid-discharge port in the direction of crossing the travel direction of the substrate,    (d) two supplementary air discharge ports arranged adjacent to said liquid discharge port on both sides in the travel direction of the substrate, and    (e) a partition wall positioned between the two adjacent liquid discharge ports and protruding downward by a prescribed length.    
     
     
         2 . Device for applying a liquid on sheet-shaped materials as described in  claim 2  [sic]; characterized in that the partition wall is also installed at the end of the coating device which is adjacent to the liquid-discharge port positioned at the end of the coating device in the direction of crossing the travel direction of the substrate.  
     
     
         3 . Method for applying a liquid on sheet-shaped materials, which is a method for applying a liquid, such as an adhesive, on long sheet-shaped materials traveling at high speed, using a coating device equipped with a valve mechanism to start and stop feeding a liquid, at least two liquid-discharge ports which discharge the liquid fed through the valve mechanism, and a partition wall positioned between the two adjacent liquid discharge ports and protruding downward by a prescribed length, said method comprising the following steps: 
 (a) discharging a liquid from the liquid-discharge port of the coating device provided in noncontact with the sheet-shaped substrate,    (b) discharging seam air from the seam air discharge ports provided in the direction of crossing the travel direction of the substrate and on both sides of the liquid discharge port onto the bead-form liquid discharged from the liquid-discharge port which swings the bead-form liquid in the direction of crossing the travel direction of the sheet-shaped substrate,    (c) attaching the swung bead-form liquid to the surface of the traveling sheet-shaped substrate, and    (d) steps of (a)-(c) are carried out for each liquid-discharge port of the coating device while supplementary air is being discharged from the supplementary air-discharge ports provided near both sides in the travel direction of the substrate to coat a liquid on the sheet-shaped substrate.