JPH06198239A - Spray coating device for curtain fiber like adhesive - Google Patents

Abstract

PURPOSE:To reduce production cost by rationalizing the processing of a coating nozzle orifice group and to appropriately alter a coating pattern by interposing a shim plate having comb-shape grooves between first and second blocks and constituting the coating nozzle orifice group of the comb-like grooves of the shim plate. CONSTITUTION:In a spray coating device, the hot-melt adhesive beat ejected from a coating nozzle orifice group provided in the direction crossing the feed direction of an adhesive coating line is extended into an elongated fiber shape by a compressed air stream and the elongated fiber like hot-melt adhesives from adjacent coating nozzle orifices are allowed to mutually approach to be applied as a curtain fiber like adhesive. A shim plate 5 is interposed between a first block 1F and a second block 1R to constitute a nozzle unit 1 and comb- shape grooves 7 are formed to the shim plate 5 and surrounded on both sides thereof by the first and second blocks 1F, 1R to form coating nozzle orifices to be allowed to function as the coating nozzle orifice group.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention applies a hot melt adhesive beet discharged from an application nozzle by a pressurized air flow to apply it as a long and narrow fibrous adhesive to a base material on the upper surface of an adhesive application line. Thus, the present invention relates to a hot melt adhesive application device for forming a thin adhesive application surface on the upper surface of a base material. For more details,
The present invention relates to a spray application device for a curtain fiber adhesive for spray applying a hot melt adhesive in a curtain fiber state.

[0002]

2. Description of the Related Art In applying a hot melt adhesive to a base material on the upper surface of an adhesive application line, a hot melt adhesive beat discharged from an application nozzle is brought into contact with pressurized air from an air nozzle adjacent to the application nozzle. A coating device is known in which a thin and long fiber is formed by stretching and the adhesive is thinly supplied to the base material on the upper surface of the adhesive coating line. Also,
By applying pressurized air that comes into contact with the hot melt adhesive beet discharged from the application nozzle as a rotating jet, the application is performed in a spiral spray pattern and the application range is expanded to increase the application width. , JP 61-200869 A, "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 above-mentioned spiral spray pattern, the hot melt adhesive H to the base material is applied.
As shown in FIG. 11, the coating state of No. 1 is such that a large number of circles overlap each other, and in the portion shown by R in FIG. In addition, there is a problem that a coating surface having a uniform coating thickness cannot be obtained. Further, the coating width is constant and is determined by the diameter of the circle of the spiral spray pattern, and there is a problem that the coating width cannot be set arbitrarily.

Regarding the application technique of the hot melt adhesive which solves the above problems, the applicant of the present invention filed Japanese Patent Application No. 4-1633.
No. 08 “Hot Melt Adhesive Coating Device” has been filed. The above-mentioned invention of the prior application is a hot-melt adhesive beet having a large number of coating nozzle holes and a large number of air nozzle holes arranged adjacent to each other in a direction intersecting the transport direction of the coating base material and ejected from the large number of coating nozzle holes. Of the hot melt adhesive bead is ejected from a number of air nozzle holes adjacent to the row of, and the hot melt adhesive beet is elongated by the flow of the pressurized air to form an elongated fiber, and an elongated fiber hot melt adhesive. Discloses a technique of forming a curtain-shaped spray coating state by adjoining each other. In order to form a curtain-shaped spray coating state, it is necessary to form very thin holes adjacent to each other in the above-mentioned many coating nozzle holes, so that there is a problem that a high processing technique is required. Therefore, an object of the present invention is to facilitate the processing of a large number of thin adjacent coating nozzle holes in a spray coating apparatus for a curtain fiber adhesive.

[0005]

According to a first aspect of the present invention, between a first block and a second block constituting a coating nozzle,
The application nozzle hole group is formed by interposing a shim plate having a comb-shaped groove. A second aspect of the present invention is to divide a large number of the application nozzle holes formed by comb-shaped grooves of a shim plate into a plurality of nozzle hole groups to form a plurality of nozzle hole groups, and to control the adhesive supply control valve for each nozzle hole group. Is provided and each of the plurality of nozzle hole groups is independently connected to the adhesive supply source, and the application pattern in the width direction of the application base material can be freely selected by the control of the adhesive supply control valve. In the third invention of the present application, the application nozzle hole group is formed by a comb-shaped groove of a shim plate interposed between the first block and the second block, and the air holes of the first block are formed by the shim of the first block. An air hole is opened in the application nozzle hole group formed by the comb-shaped groove of the shim plate by opening in the plate facing surface, and pressurized air is applied to the adhesive in the middle of the application nozzle hole group.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. With reference to FIG. 1, an adhesive application nozzle device B is arranged so as to face the upper surface of a substrate W being transported in the transport direction P by an adhesive coating line A. The adhesive application nozzle device B positions the application nozzle hole group 11 in a direction intersecting the conveyance direction P of the base material W (in the embodiment, the orthogonal direction, that is, the transverse direction of the adhesive application line A), A nozzle unit 1 arranged above the adhesive application line A, and an adhesive supply control valve 2 integrated with the nozzle unit 1.
The nozzle unit 1 includes a coating nozzle hole group 11 including a large number of coating nozzle holes 11a.
An air nozzle hole group 1 composed of a large number of air nozzle holes 12a is formed in the transport front side a (or the transport front side b, the transport front side a and the transport front side b) of the coating nozzle hole group 11.
2 is provided. The air nozzle hole group 12 is connected to the pressurized air source 4 via the pressurized air holes 13. Nozzle unit 1
And a heater 6 is installed in the adhesive supply control valve 2,
The hot melt adhesive being supplied is maintained within a predetermined temperature range.

The application nozzle hole group 11 is connected to a hot melt adhesive supply source (adhesive tank and pressure feed pump) 3 via an adhesive supply control valve 2. With reference to FIG. 2, the application nozzle hole group 11 and the air nozzle hole group 12 are arranged in a straight line in a direction orthogonal to the conveyance direction P of the base material W, and the air nozzle hole 12a is an application nozzle. Hole group 1
It is located close to the front side of the first coating nozzle hole 11a.

The adhesive supply control valve 2 is provided with a valve chamber 24 in a valve housing 20 having an inlet 21, a supply port 22 and a return port 23 for hot melt adhesive, and a valve body 25 which can move up and down in the valve chamber. Is operated up and down by a valve body operation mechanism 26 operated by an operation air or a solenoid valve, so that hot melt adhesive is supplied to the nozzle unit 1 and cut off, and hot melt is passed through the return port 23 at the time of cutoff. The hot melt adhesive is circulated by returning it to the adhesive supply source 3 at the time of application suspension, and is prevented from deterioration due to retention of the hot melt adhesive.

Referring to FIG. 1, a base material (processing material to which the hot melt adhesive H is to be applied, a top surface of the adhesive application line A,
For example, a sheet-shaped polyester film W is placed and conveyed in one direction (P direction), and hot-melt adhesive H is applied from an adhesive application nozzle device B installed above the adhesive application line A. Applying the hot melt adhesive H to a predetermined portion of the base material W by jetting it toward the base material W on the upper surface of the line A which is being conveyed is similar to a known hot melt adhesive application device. The hot melt adhesive discharged from the nozzle unit 1 is composed of a large number of coating nozzle holes 11a adjacent to each other at a slight interval. Dissolve as a melt adhesive.

Conveyance of the coating nozzle hole group 11 By the pressurized air flow E discharged from each air nozzle hole 12a of the air nozzle hole group 12 which is adjacent to the front side, a large number of filamentous or beet hot melt adhesives which are adjacent to each other are conveyed. A screen of pressurized air flow is formed in the front. The coating nozzle hole group 11
When a group of air nozzle holes 12R adjacent to each other is formed at the rear of the conveyance, the pressurized air flow discharged from each air nozzle hole of the group of air nozzle holes 12R causes a large number of thread-shaped or beet hot melt adhesives adjacent to each other. By forming a screen of pressurized air flow also in the rear of the transportation of the hot melt adhesive, it is possible to prevent a large number of thread-shaped or beet hot melt adhesives from spreading to the rear of the transportation, and the front side and the rear of the hot melt adhesive are transported. When the air nozzle hole groups 12 are formed on both sides, they are sandwiched from the front and rear of the conveyance to prevent the front and rear of the conveyance from spreading.

By contacting the pressurized air from the air nozzle hole 12a, the hot melt adhesive beet is stretched to become a long and narrow fibrous adhesive, but at that time, it is prevented from spreading to the front and rear of the conveyance. As a result, the fibers spread only in the left-right direction and come into contact with each other to be integrated to form a screen-shaped fiber adhesive. Thus, as a screen-like fiber adhesive, it vertically descends and is applied to the base material on the upper surface of the adhesive application line, and the application surface of the base material W has a substantially uniform application thickness and an extremely thin adhesive. The coated surface of is formed. The coating pattern (coating position, coating length) of the coating surface of the base material W in the transport direction is arbitrarily set by the operation control of the adhesive supply control valve 2.

In carrying out the first invention of the present application, referring to FIGS. 1 to 4, a first block 1F and a second block 1R will be described.
The shim plate 5 is interposed between the nozzle unit 1 and the nozzle unit 1, and the comb-shaped groove 7 is formed in the shim plate 5. By enclosing both sides of the comb-shaped groove 7 with the first block 1F and the second block 1R, the application nozzle hole 11a is formed and functions as the application nozzle hole group 11 of the above-mentioned prior invention. Since the upper part of the comb-shaped groove 7 faces the lateral hole 14 communicating with the supply port 22 of the adhesive supply control valve 2 through the supply hole 15, the comb-shaped groove 7 forming the coating nozzle hole 11a is formed. It is always in communication with the supply port 22 of the adhesive supply control valve 2.

Although the size (cross-sectional area) and number of the comb-shaped grooves 7 can be arbitrarily selected, in the embodiment, the comb-shaped grooves 7 forming the coating nozzle holes are set to 0.5 mm and the mutual interval is set to 1 mm, and the shim plate 5 is formed. Has a thickness of 0.5 mm. Further, the comb-shaped 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 pieces to form a non-application area between the application areas. Moreover, the cross-sectional area of the coating nozzle hole 11 can be appropriately selected by using a plurality of shim plates 5 or by replacing the shim plates with different thicknesses, and thus the coating thickness can be appropriately selected. For example, by using two shim plates 5 having the same thickness as the shim plates, as shown in FIG. 5, the cross-sectional area is twice as large as the cross-sectional area of FIG. ,
The coating thickness is also doubled.

In the second invention of the present application, referring to FIG. 6, a large number of coating nozzle holes 11 formed by the comb-shaped grooves 7 of the shim plate 5 are provided.
a is divided into a plurality of nozzle hole groups 8A,
8B, 8C ... Are formed, and the lateral holes 14, the supply holes 15 and the adhesive supply control valves 2 are plural in number corresponding to the number of nozzle hole groups. For example, referring to FIG. 7, regarding the coating nozzle holes 11a of the coating nozzle hole group 11, a, b are nozzle hole groups 8A, c, d, e are nozzle hole groups 8B, and f, g, h are nozzles. Hole group 8C ... Multiple nozzle hole groups 8
A, 8B, 8C ... Independently of the lateral holes 14A,
14B, 14C ... and supply holes 15A, 15B, 15
After passing through C ..., corresponding adhesive supply control valves 2
By connecting to A, 2B, 2C, ..., the nozzle hole groups 8A and 8A for a large number of coating nozzle holes 11a.
It is configured to control the supply of the adhesive for each of B, 8C, ....

A plurality of adhesive supply control valves 2A, 2B, 2
With the individual control of C ..., the coating pattern on the base material W on the upper surface of the coating line can be appropriately set in the base material width direction and the conveyance direction (FIG. 8 shows an example of the coating pattern). In the third invention of the present application, with reference to FIGS. 9 and 10, a shim plate 5 is interposed between the first block 1F and the second block 1R,
Similar to the first invention, the comb-shaped groove 7 formed in the shim plate 5 constitutes a large number of coating nozzle holes 11a, but the opening 9a is further provided in the first block 1F so as to face the shim plate of the first block 1F. By providing the air holes 9 as the surfaces, the air nozzle holes 12 are caused to function.

The air holes 9 open in the coating nozzle hole group 11a formed by the comb-shaped grooves 7 of the shim plate 5, and pressurized air acts on the adhesive in the middle of the coating nozzle hole group. Therefore, forming a single air hole 9 makes it unnecessary to process a large number of air nozzle holes. Further, by applying the pressurized air to the adhesive in the middle of the application nozzle hole, the pressurized air flow can be effectively applied to the adhesive by eliminating the diffusion of the pressurized air.

[0017]

INDUSTRIAL APPLICABILITY According to the present invention, a hot-melt adhesive beet is contacted with pressurized air from an air nozzle and stretched to form a long and narrow fibrous adhesive, which is applied to the base material on the upper surface of the adhesive application line. When applying and forming an extremely thin application surface, a large number of elongated fibrous adhesives from the application nozzle hole group are formed by adhering the screen-like pressurized air flow from the air nozzle hole group from the front to the back. As a result of being applied in a uniform shape to the base material, an extremely thin adhesive application surface can be formed with a uniform application thickness. Therefore, it is particularly effective for application to the sheet surface of the product, in which the quality of the product is deteriorated due to a slight excessive amount of the hot melt adhesive applied. Furthermore,
In the first invention of the present application, in spray-applying the hot-melt adhesive in the form of curtain fibers, the manufacturing cost is reduced by rationalizing the processing of the application nozzle hole group. Further, the coating pattern can be appropriately changed by selecting the comb-shaped groove of the shim plate.

In the second invention of the present application, a large number of coating nozzle holes are grouped and an adhesive supply control valve is provided for each group, and the coating timing can be selected for each group by independent operation control of each adhesive supply control valve. By applying intermittently to the coating line, in addition to changing the coating pattern in the width direction of the substrate, the coating length in the substrate conveying direction can be changed for each group of coating nozzle holes. Therefore, it is possible to form a coating surface with a complicated shape, reduce the amount of adhesive applied to the outside of the product area, and reuse the end material as recycled pulp without the adhesive adhering to the end material after cutting the product. It has the effect of facilitating.

In the third invention of the present application, a single air hole is formed in the coating nozzle hole group formed by the comb-shaped groove of the shim plate, so that the pressurized air acts in the middle of the coating nozzle hole group. Therefore, there is an effect that the manufacturing cost is reduced by omitting the processing of many air nozzle holes and simplifying the pressurized air supply mechanism. Further, by applying pressurized air to the adhesive in the middle of the application nozzle hole, diffusion of the pressurized air is eliminated and a pressurized air flow is effectively applied to the adhesive in the application nozzle hole, thereby applying pressure. There is an effect that air loss can be eliminated, the required air amount required for the pressurized air source is reduced, and the power cost of the coating apparatus is reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a spray coating device for a curtain fiber adhesive showing an embodiment of the first invention of the present application.

FIG. 2 is a transverse cross-sectional view taken along the line SS of FIG.

FIG. 3 is a perspective view of a shim plate that is a main part of the first invention of the present application.

FIG. 4 shows another embodiment of the shim plate, FIG. 4a is a front view,
Figure b shows the arrangement of the coating nozzle hole groups.

FIG. 5 shows an arrangement of coating nozzle hole groups in an example in which two shim plates are used.

FIG. 6 is a cross-sectional view of a curtain fiber adhesive spray application apparatus showing an embodiment of the second invention of the present application.

FIG. 7 is an explanatory diagram of a nozzle hole group.

FIG. 8 is an explanatory view showing various coating patterns according to the second invention of the present application.

FIG. 9 is a vertical sectional view similar to FIG. 1, showing an embodiment of the third invention of the present application.

FIG. 10 is an exploded perspective view of the nozzle unit, also showing the main part.

FIG. 11 is an explanatory diagram showing a coating state by a known spiral spray pattern.

[Explanation of symbols]

 A Adhesive coating line B Adhesive coating 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 (5)

[Claims] 1. A hot melt adhesive beet ejected from a group of application nozzle holes in a direction intersecting the conveying direction of an adhesive application line is stretched by a pressurized air flow to form an elongated fiber shape and adjacent application nozzle holes. In a spray coating device for spraying more elongated fibrous hot melt adhesives closer to each other and spray-coating them as curtain fiber adhesives, a shim plate having a comb-shaped groove is interposed between the first block and the second block. Further, the spray coating device for the curtain fiber adhesive is characterized in that the coating nozzle hole group is constituted by the comb-shaped grooves of the shim plate. 2. A hot-melt adhesive beet ejected from a group of application nozzle holes in a direction intersecting the conveying direction of an adhesive application line is extended by a pressurized air flow to form an elongated fiber shape and adjacent application nozzle holes. In a spray coating device for spraying more elongated fibrous hot melt adhesives closer to each other and spray-coating them as curtain fiber adhesives, a shim plate having a comb-shaped groove is interposed between the first block and the second block. Then, the application nozzle hole group is constituted by the comb-shaped groove of the shim plate, the shim plate is interposed between the first block and the second block to form the application nozzle, and the comb-shaped groove of the shim plate is formed. A large number of coating nozzle hole groups formed by is divided into a plurality of nozzle hole groups to form a plurality of nozzle hole groups, and adhesive supply control for each nozzle hole group By connecting the nozzle hole groups to the adhesive supply source independently of each other, the adhesive supply control valve controls the base material on the upper surface of the coating line so that the base material width direction and the transfer direction are A spray coating device for a curtain fiber adhesive, which is characterized in that the coating pattern can be selectively applied. 3. The shim plate interposed between the first block and the second block can be replaced with one having a different thickness so that the cross-sectional area of the coating nozzle hole can be changed. The spray coating device for a curtain fiber adhesive according to claim 1 or 2, which is characterized in that. 4. With respect to the shim plate interposed between the first block and the second block, one or a plurality of the shim plates can be selected and the cross-sectional area of the coating nozzle hole can be changed. Of claim 1 or claim 2,
Curtain fiber adhesive spray application device. 5. A hot-melt adhesive beet ejected from a group of application nozzle holes in a direction intersecting the conveying direction of an adhesive application line is stretched by a pressurized air flow to form an elongated fiber shape and adjacent application nozzle holes. In a spray coating device for spraying more elongated fibrous hot melt adhesives closer to each other and spray-coating them as curtain fiber adhesives, a shim plate having a comb-shaped groove is interposed between the first block and the second block. Then, the application nozzle hole group is constituted by the comb-shaped grooves of the shim plate, and the opening of the air hole of the first block is formed into the first hole.
As a surface facing the shim plate of the block, an air hole was opened in the application nozzle hole group formed by the comb-shaped groove of the shim plate, and pressurized air was applied to the adhesive in the middle of the application nozzle hole group. Characteristic is a spray coating device for curtain fiber adhesive.