JP3458313B2 - Spray coater for curtain fiber adhesive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a hot-melt adhesive beat discharged from a coating nozzle is stretched by a pressurized air stream to form an elongated fiber adhesive. The present invention relates to a hot melt adhesive coating apparatus for forming a thin adhesive application surface on an upper surface of a base material by applying the thin adhesive to an upper surface of a base material application line. More specifically, the present invention relates to a curtain fiber adhesive spray application device for spray-application of a hot melt adhesive in a curtain fiber state. In applying a hot melt adhesive to a base material on an upper surface of an adhesive application line, pressurized air from an air nozzle adjacent to the application nozzle is applied to a hot melt adhesive beat discharged from an application nozzle. 2. Description of the Related Art Coating apparatuses for supplying an adhesive thinly to a substrate on the upper surface of an adhesive application line in the form of an elongated fiber by contacting and stretching are known. Also,
By applying a pressurized air in contact with a hot melt adhesive beat discharged from an application nozzle as a rotary jet, the application is performed in a spiral spray pattern, the application range is enlarged, and the application width is increased. And JP-A-61-200869, entitled "Method and Apparatus for Spraying Molten Adhesive". [0003] When the hot melt adhesive H is applied to the base material on the upper surface of the adhesive application line in the spiral spray pattern described above, the hot melt adhesive H is applied to the base material.
As shown in FIG. 11, the application state of a large number of circles overlaps, and in the portion indicated by R in FIG. 11, the application thickness of the hot melt adhesive becomes large due to the overlap of the circles of the adhesive beats, and However, there is a problem that a coating surface having a uniform coating thickness cannot be obtained. Further, the application width is determined by the diameter of the spiral spray pattern circle and is constant, and there is a problem that the application width cannot be set arbitrarily. [0004] Regarding the hot melt adhesive coating technique for solving the above problems, the present applicant has filed Japanese Patent Application No. Hei 4-1633.
No. 08 "Hot melt adhesive coating device" has been filed. The above prior invention discloses a hot melt adhesive beat in which a large number of application nozzle holes and a large number of air nozzle holes are arranged adjacent to each other in a direction intersecting with the conveying direction of a coating substrate, and are ejected from the large number of application nozzle holes. A row of pressurized air is blown out from a number of air nozzle holes adjacent to the row of, and a number of hot melt adhesive beats are stretched by the pressurized air flow to form a long and thin fiber, and a hot and thin fiber melt adhesive A technique for forming a curtain-like spray application state by adjoining agents is disclosed. In order to form a curtain-shaped spray application state, since the above-mentioned many application nozzle holes need to form very thin holes adjacent to each other,
SUMMARY OF THE INVENTION An object of the present invention is to facilitate the processing of a large number of adjacent coating nozzle holes in a spray coating apparatus for curtain fiber adhesive, because of the problem that a high processing technology is required. It is another object of the present invention to reduce the energy loss by effectively applying a pressurized air flow to a hot melt adhesive when supplying pressurized air for spray coating of a curtain fiber adhesive. According to the present invention, the group of coating nozzle holes is formed by a comb-like groove of a shim plate interposed between a first block and a second block, and the first block is formed. Is opened in the shim plate facing surface of the first block, and an air hole is opened in the application nozzle hole group formed by the comb-shaped groove of the shim plate. To pressurized air. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments shown in the drawings. Referring to FIG. 1, an adhesive application nozzle device B is disposed so as to face an upper surface of a base material W being transported in a transport direction P by an adhesive application line A. The adhesive application nozzle device B positions the application nozzle hole group 11 in a direction intersecting the transport direction P of the base material W (in the embodiment, an orthogonal direction, that is, a transverse direction of the adhesive application line A). A nozzle unit 1 disposed above the adhesive application line A, and an adhesive supply control valve 2 integrated with the nozzle unit 1
The nozzle unit 1 includes an application nozzle hole group 11 configured by a number of application nozzle holes 11a;
An air nozzle hole group 1 composed of a large number of air nozzle holes 12a is provided on the transport front side A of the application nozzle hole group 11 (or on both sides of the transport front side B and the transport front side A and the transport front side B).
2 is provided. The air nozzle hole group 12 is connected to the pressurized air source 4 via the pressurized air hole 13. Nozzle unit 1
And the adhesive supply control valve 2 is provided with a heater 6 therein,
The hot melt adhesive being supplied is maintained in a predetermined temperature range. [0007] The application nozzle hole group 11 is connected to a hot melt adhesive supply source (adhesive tank and pumping ponk) 3 via an adhesive supply control valve 2. Referring to FIG. 2, the application nozzle hole group 11 and the air nozzle hole group 12 are arranged in a line in a straight line in a direction orthogonal to the transport direction P of the base material W. Hole group 1
One application nozzle hole 11a is located close to and forward of the conveyance. The adhesive supply control valve 2 is provided with a valve chamber 24 in a valve housing 20 having a hot melt adhesive inlet 21, a supply port 22, and a return port 23, and a valve body 25 which can move up and down in the valve chamber. Is moved up and down by a valve body operating mechanism 26 operated by an operation air or a solenoid valve, so that the hot melt adhesive is supplied to the nozzle unit 1 and cut off, and the hot melt is returned through the return port 23 at the time of cut off. The hot melt adhesive is returned to the adhesive supply source 3 so as to circulate the hot melt adhesive when the application is stopped, thereby preventing deterioration due to stagnation of the hot melt adhesive. Referring to FIG. 1, a base material (a processing material to which hot-melt adhesive H is to be applied,
For example, a sheet-like polyester film) W is placed and transported in one direction (P direction), and a hot melt adhesive H is applied from an adhesive application nozzle device B provided above the adhesive application line A to apply the adhesive. Spraying the hot melt adhesive H onto a predetermined portion of the base material W by ejecting the hot melt adhesive H toward the substrate W being conveyed on the upper surface of the line A is the same as in a known hot melt adhesive application apparatus. The hot-melt adhesive discharged from the nozzle unit 1 is formed of a group of application nozzle holes 11 adjacent to each other at a small interval with a large number of application nozzle holes 11a. Dispensed as melt adhesive. A plurality of thread-like or beat hot melt adhesives adjacent to each other are conveyed by the pressurized air flow E discharged from each air nozzle hole 12a of the air nozzle hole group 12 adjacent to the front of the application nozzle hole group 11. A screen of pressurized airflow is formed in front. The application nozzle hole group 11
When the air nozzle hole group 12R adjacent to the rear of the conveyance is formed, a large number of thread-like or beat hot melt adhesives adjacent to each other are formed by the pressurized air flow discharged from each air nozzle hole of the air nozzle hole group 12R. A screen of a pressurized air flow is also formed behind the transfer of the hot melt adhesive, which prevents a large number of thread-like or beaty hot melt adhesives from spreading to the rear of the transfer, and prevents the hot melt adhesive from being transferred forward and backward. When the air nozzle hole group 12 is formed on both sides, the air nozzle hole group 12 is sandwiched from the front side and the rear side of the conveyance to prevent the front side and the rear side of the conveyance from spreading. By contacting the pressurized air from the air nozzle hole 12a, the hot melt adhesive beat is elongated to become an elongated fiber-like adhesive. As a result, it spreads only in the left-right direction and comes into contact with each other to be integrated into a screen-like fiber adhesive. Thus, the screen-like fiber-like adhesive is applied vertically to the substrate on the upper surface of the adhesive application line, and the application surface of the substrate W has a substantially uniform application thickness and an extremely thin adhesive. Is formed. The application pattern (application position, application length) of the application surface of the base material W in the transport direction is arbitrarily set by controlling the operation of the adhesive supply control valve 2. Referring to FIGS. 1 to 4, a nozzle unit 1 is formed by interposing a shim plate 5 between a first block 1F and a second block 1R. Form. By coating both sides of the comb-shaped groove 7 with the first block 1F and the second block 1R, an application nozzle hole 11a is formed, and functions as the application nozzle hole group 11 of the above-mentioned prior application. Adhesive supply control valve 2 through supply hole 15
The upper portion of the comb-shaped groove 7 faces the horizontal hole 14 communicating with the supply port 22 of the adhesive nozzle, so that the comb-shaped groove 7 constituting the application nozzle hole 11 a is connected to the supply port 22 of the adhesive supply control valve 2. Always in communication. The dimensions (cross-sectional area) and number of the comb-shaped grooves 7 can be arbitrarily selected. In the embodiment, the comb-shaped grooves 7 constituting the coating nozzle holes are 0.5 mm, the interval between them is 1 mm, and the shim plate 5 is formed. Was 0.5 mm in thickness. Further, the comb-like grooves 7 do not need to be continuous, and the object of the present invention can be achieved even if they are partially formed. For example, as shown in FIG. 4, the comb-shaped groove 7 may be divided into a plurality of units to form a non-application range between the application ranges. In addition, by changing the shim plate 5 to a plurality of sheets or replacing the shim plate 5 with a shim plate having a different thickness, the sectional area of the application nozzle hole 11 can be appropriately selected, and the application thickness can be appropriately selected. For example, by using two shim plates 5 of the same thickness as the shim plate, as shown in FIG. 5, the cross-sectional area becomes twice as large as the cross-sectional area of FIG. ,
The coating thickness is also doubled. Referring to FIG. 6, a plurality of application nozzle holes 11a formed by comb grooves 7 of shim plate 5 are divided into a plurality of nozzle holes groups 8A, 8B, 8C.
And the number of the lateral holes 14, the supply holes 15, and the adhesive supply control valve 2 is set to a number corresponding to the number of the nozzle hole groups. For example, referring to FIG. 7, regarding the application nozzle holes 11 a of the application nozzle hole group 11, a and b are set as the nozzle hole groups 8 A, and c, d, and e are set as the nozzle hole groups 8.
B, and f, g, and h are nozzle hole groups 8C. A plurality of nozzle hole groups 8A, 8B, 8C ...
Are independent of each other, and the horizontal holes 14A, 14B, 14C,.
, Through the supply holes 15A, 15B, 15C,..., Respectively, corresponding adhesive supply control valves 2A, 2B, 2C,.
, The supply of the adhesive is controlled for each of the nozzle hole groups 8A, 8B, 8C,. A plurality of adhesive supply control valves 2A, 2B, 2
With the individual control C, the application pattern for the substrate W on the upper surface of the application line can be set as appropriate in the substrate width direction and the transport direction (FIG. 8 shows an example of the application pattern). The present invention will be described with reference to FIG. 9 and FIG.
A shim plate 5 is interposed between the F and the second block 1R, and a large number of application nozzle holes 1 are formed by comb grooves 7 formed in the shim plate 5.
Constituting 1a is the same as the first invention,
By providing an air hole 9 in the first block 1F with the opening 9a facing the shim plate of the first block 1F, the air hole 9 functions as the air nozzle hole group 12. The air holes 9 open in the application nozzle hole group 11a formed by the comb grooves 7 of the shim plate 5, and pressurized air acts on the adhesive in the middle of the application nozzle hole group. Therefore, forming a single air hole 9 eliminates the need for processing a large number of air nozzle holes. Further, by applying the pressurized air to the adhesive in the middle of the application nozzle hole, diffusion of the pressurized air is eliminated, and the pressurized air flow is effectively applied to the adhesive. According to the present invention, a hot melt adhesive beat is brought into contact with pressurized air from an air nozzle to be drawn into an elongated fibrous adhesive to form a base on the upper surface of an adhesive application line. In applying the material to form an extremely thin coating surface, a large number of elongated fiber-like adhesives from the application nozzle holes should make a screen-like pressurized air flow from the air nozzle holes adjacent from the front and back. By applying the adhesive in the form of a screen to the substrate, an extremely thin adhesive-coated surface can be formed with a uniform coating thickness. Therefore, it is particularly effective for application to a sheet surface of a product where the quality of the product is degraded due to a slight application amount of the hot melt adhesive. Furthermore,
In spray coating the hot melt adhesive in the form of curtain fiber, the manufacturing cost is reduced by rationalizing the processing of the coating nozzle hole group. Further, the application pattern can be appropriately changed by selecting the comb-shaped groove of the shim plate. Further, according to the present invention, a single air hole is opened in the group of application nozzle holes formed by the comb-shaped grooves of the shim plate, so that pressurized air acts in the middle of the group of application nozzle holes. Therefore, there is an effect of reducing the manufacturing cost by simplifying the pressurized air supply mechanism by eliminating the processing of a large number of air nozzle holes. Further, by applying pressurized air to the adhesive in the middle of the application nozzle hole, diffusion of the pressurized air is eliminated, and the pressurized air flow is effectively applied to the adhesive in the application nozzle hole, thereby increasing the pressure. Since the loss of air can be eliminated, the required amount of air required for the pressurized air source is reduced, and the power cost of the coating apparatus is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a spray apparatus for a curtain fiber adhesive according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line SS in FIG. 1. FIG. 3 is a perspective view of a shim plate which is a main part of the present invention. FIG. 4 shows another embodiment of the shim plate, wherein FIG.
FIG. b shows the arrangement of the application nozzle hole group. FIG. 5 shows an arrangement of application nozzle hole groups in an embodiment having two shim plates. FIG. 6 is a cross-sectional view of a spray apparatus for a curtain fiber adhesive according to another embodiment. FIG. 7 is an explanatory view of a nozzle hole group. FIG. 8 is an explanatory view showing various coating patterns. FIG. 9 is a longitudinal sectional view similar to FIG. 1 showing an embodiment of the present invention. FIG. 10 is an exploded perspective view of the nozzle unit showing a main part of the same. FIG. 11 is an explanatory view showing an application state by a known spiral spray pattern. [Description of Signs] A Adhesive application line B Adhesive application nozzle device H Hot melt adhesive W Base material 1 Nozzle unit 2 Adhesive supply control valve 3 Hot melt adhesive supply source 4 Pressurized air source 5 Shim plate 7 Comb Groove 9 air hole 11 coating nozzle hole group 12 air nozzle hole group

Claims (1)

(57) [Claims 1] A hot melt adhesive beat ejected from a group of application nozzle holes in a direction intersecting with a conveying direction of an adhesive application line is elongated by applying a pressurized air flow. In a spray coating apparatus for forming a fiber-shaped and hot-melt adhesive from a coating nozzle hole adjacent to each other so as to approach each other and spray-coating as a curtain fiber adhesive, a comb is provided between a first block and a second block. A shim plate having a groove is interposed, and the application nozzle hole group is constituted by the comb-like grooves of the shim plate, and the opening of the air hole of the first block is set as the surface facing the shim plate of the first block. Air holes are opened in the application nozzle hole group formed by the comb-shaped grooves, and pressurized air is applied to the adhesive in the middle of the application nozzle hole group. Spray coating device of Iba-like adhesive.