JP2004154665A - Spray coating application method for hot melt adhesive and coating application nozzle device for hot melt adhesive spray coatingapplicator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an amount of supply of pressurized air from pressurized air aperture and to provide a hot melt adhesive surface having powerful adhesion with hot melt adhesives of the smaller usage. <P>SOLUTION: (1) The hot melt adhesives are discharged from nozzle base openings of a number of hot melt adhesive apertures formed as square apertures of a square shape in section to form hot melt adhesive beads of a rectangular shape in section in the progressing direction of a coating application line. (2) Slit air is formed by the pressurized air discharged from the nozzle base openings of the pressurized air apertures situated before and behind each of the number of the hot melt adhesive apertures and acts before and behind the hot melt adhesive beads of the square shape in section. (3) The hot melt adhesive beads are held in a sandwich form by a pair of the front and rear slit air around the hot melt adhesive beads and are lowered in this state. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention is to apply a hot-melt adhesive to the base material on the top of the application line to form a thin adhesive application surface, or to enable bonding requiring air permeability, and in a body fluid absorbing product. The present invention relates to a hot melt adhesive spray application apparatus and a hot melt adhesive spray application method capable of manufacturing a soft and mild bonded product.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. Hei 5-309310 (Japanese Patent Application No. 4-163308), "Application Apparatus for Applying Hot Melt Adhesive", which is filed by the present applicant, is known as a hot melt adhesive spray application apparatus (Patent Document 1). The publication discloses that a large number of coating nozzle holes are arranged in the direction crossing the conveyance of a coating line to form a coating nozzle hole group, and pressure is applied in front of and behind the coating nozzle hole group to approach the coating nozzle hole group. The hot melt adhesive is applied to the base material as a curtain fiber-like thin film by supplying air and applying a pressurized air flow to both the front and rear sides of a number of hot melt adhesive beats discharged from a number of application nozzle holes. Spray applied.
[0003]
[Patent Document 1] Japanese Patent Laid-Open Publication No. Hei 5-309310
[Problems to be solved by the invention]
In the curtain fiber type spray coating device of the above-mentioned known document, a thin and uniform coating surface is obtained, so that the amount of hot melt adhesive used is remarkably reduced as compared with the conventional spiral spray coating device, and strong adhesion is achieved. However, there is a slight gap between the hot-melt adhesive hole group and the pressurized air holes located before and after the hot-melt adhesive hole group on the bottom surface of the coating nozzle device, and the hot-melt adhesive hole In a state where the discharged hot melt adhesive becomes a hot melt adhesive beat, that is, pressurized air from the pressurized air hole at a position slightly away from the hot melt adhesive hole opening on the bottom surface of the application nozzle device. By causing the hot melt adhesive to act on the beat, the amount of pressurized air used increases, resulting in the scattering of the hot melt adhesive and the hot melt bonding. Maintenance outage as a countermeasure for the adhesion of the hot melt adhesive to the holes near the consumption of air energy has a problem of equal is excessive.
Therefore, an object of the present invention is to provide a hot melt adhesive surface having a strong adhesive force with a reduced amount of pressurized air supplied from a pressurized air hole and a smaller amount of hot melt adhesive. I do.
[0005]
[Means for Solving the Problems]
The invention of claim 1 of the present application is characterized in that: (1) hot melt adhesive having a rectangular cross section in the direction of the application line is ejected from a nozzle bottom opening of a number of hot melt adhesive holes having square holes having a rectangular cross section. (2) a slit air is formed by pressurized air discharged from a nozzle bottom opening of a pressurized air hole located in front and rear of each of a plurality of hot melt adhesive holes, and the slit air is formed. Acting before and after the hot melt adhesive beat having a square cross section, and (3) dropping the hot melt adhesive beat in a sandwich shape with a pair of front and rear slit air around the hot melt adhesive beat. A hot melt adhesive spray coating method is provided.
The invention of claim 2 of the present application provides, in addition to the invention of claim 1, a hot melt adhesive spray coating method characterized in that laterally oscillating thread-like fibers that do not intersect with each other are generated on the surface of a substrate of an application line. I do.
The invention of claim 3 of the present application is to form a large number of hot melt adhesive holes in the form of square holes having a rectangular cross section in parallel with the application line transverse direction, and in the application line transverse direction adjacent to each hot melt adhesive hole, A large number of pressurized air holes are formed on the front and rear sides of the hot melt adhesive hole at the front end and the rear end of the hot melt adhesive hole opening with the center of the opening adjacent to the hot melt adhesive hole. An application nozzle device for a hot melt adhesive spray application device, characterized in that a number of pressurized air holes are formed in the front and rear sides of the adhesive hole in a direction transverse to the application line.
According to a fourth aspect of the present invention, in addition to the third aspect of the present invention, in the vertical section in the application line direction of the application nozzle device, the pressurized air hole is formed so that the hot-melt adhesive hole is formed with respect to the vertical hot-melt adhesive hole. A hot-melt adhesive spray application device, characterized in that the application nozzle device is located at the front and rear of the hot-melt adhesive spraying device.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
According to the invention of claim 1 of the present application, (1) a hot melt adhesive beat having a rectangular cross section in the application line traveling direction is formed by discharging from a nozzle bottom opening, and (2) discharging from a nozzle bottom opening of a pressurized air hole. A slit air is formed by pressurized air, and the slit air is caused to act before and after the hot melt adhesive beat having the rectangular cross section. (3) The hot melt is formed by a pair of front and rear slit air around each hot melt adhesive beat. By lowering the melt adhesive beet while sandwiching it with scissors in a sandwich shape, an application surface made of the undulating fiber is formed on the base material.
According to the third aspect of the present invention, the bottom opening of the hot melt adhesive hole 2 on the bottom surface of the nozzle and the bottom opening of the pressurized air hole 5 are adjacent to each other, and the bottom opening of the hot melt adhesive hole 2 is rectangular in the application line direction. By making the pressurized air hole 5 into a slit shape thinner than the width of the hot melt adhesive hole 2 and longer in the longitudinal direction, and having a sharp inclination angle in the front-rear direction with respect to the hot melt adhesive hole 2 in the vertical direction. Then, a pair of front and rear slit airs extending downward from the hot melt adhesive beat flowing down from the nozzle bottom surface is formed.
[0007]
【Example】
The present invention will be described in more detail with reference to the accompanying drawings.
The hot melt adhesive spray application device shown in FIGS. 6 and 7 positions the hot melt adhesive hole group 2A of the gun unit 21 in a direction intersecting with the transport direction of the transport line 20, that is, in a transverse direction of the transport line 20. Then, the gun unit 21 faces the base material 22 on the transport line 20 and is installed with a space at an appropriate distance from the base material 22.
[0008]
The gun unit 21 includes a coating nozzle device (nozzle chip) 1, a gun base 23, and a hot melt supply control valve 24, and is provided with a hot melt adhesive supply source 25 and a pressurized air supply source 26. I have.
[0009]
An embodiment of a coating nozzle device (nozzle chip) 1 which is a main part of the present invention will be described with reference to FIGS.
[0010]
The application nozzle device 1 is configured such that the vertical surfaces of a pair of nozzle blocks 10 are opposed to each other, and a coating nozzle hole 2 is formed by the skewer groove 12 with a shim plate 11 having a skewer groove 12 interposed therebetween. A group 2A of hot melt adhesive holes is formed between 10, 10. An adhesive supply hole 3 and an adhesive port 4 are formed in one nozzle block 10.
[0011]
Air blocks 13 and 13 are connected to the front and rear sides of the nozzle blocks 10 and 10, respectively. A groove is formed on the inclined surface 10a of the triangular nozzle block 10 or the inclined surface 13a of the air block 13, or a shim plate 14 having a groove formed in the lower portion is interposed between the inclined surface 10a and the inclined surface 13a. A compressed air hole 5 is formed. The pressurized air hole 5 can form the pressurized air hole group 5A as an aggregate of a large number of holes by using the shim plate 14A of FIG. 5, similarly to the shim plate 11 of FIG.
[0012]
In the air blocks 13, a pressurized air passage 6 communicating with the pressurized air hole 5 is formed in a horizontal direction, and a pressurized air supply hole 7 and a pressurized air supply port communicated with the pressurized air passage 6 are further formed. 8 is provided.
[0013]
The hot-melt adhesive hole 2 is a rectangular hole having a rectangular cross section and a rectangular cross section in the application line traveling direction when viewed from the bottom. Referring to FIGS. 3 and 4, hot melt adhesive hole 2 is formed to have a rectangular shape in the application line traveling direction when viewed from the bottom by making the width smaller than the thickness of shim plate 11.
[0014]
Referring to FIG. 3 and FIG. 4, the pressurized air hole 5 has a larger width and a smaller thickness than the hot melt adhesive hole 2. That is, the thickness of the shim plate 14 is made smaller than that of the shim plate 11, and the width of the slit (the width of the pressurized air hole 5) is made larger than that of the skewer groove 12 of the shim plate 11.
[0015]
Referring to FIG. 2, hot-melt adhesive hole 2 is vertical, and pressurized air holes 5 are located in front of and behind hot-melt adhesive hole 2 and have an acute angle with respect to hot-melt adhesive hole 2. It is a tilt direction.
[0016]
Referring to FIG. 3, the adhesive hole opening and the pressurized air opening are connected to each other on the bottom surface of the nozzle, but are bonded by interposing a mask shim plate between shim plate 11 and shim plate 14. The object of the present invention can be achieved even when the agent hole opening and the pressurized air opening are not connected and the openings are adjacent to each other at a small interval.
[0017]
Next, the hot melt adhesive spray application method according to the present invention will be described.
Referring to FIG.
{Circle around (1)} Pressurized air discharged from the nozzle bottom opening of the pressurized air hole 5 in front of and behind each of the plurality of hot melt adhesive holes and in an inclined direction at an acute angle to the hot melt adhesive holes. The slit air K1 is formed.
{Circle over (2)} The hot melt adhesive H1 is ejected from the nozzle bottom opening of a large number of hot melt adhesive holes 2 having a rectangular cross section in the direction of the application line and having a rectangular cross section in the traveling direction of the application line. Of the hot melt adhesive (that is, hot melt adhesive beat) H1 is caused to flow downward from the bottom surface of the nozzle.
{Circle around (3)} A slit air K1 having an acute angle to the hot-melt adhesive hole acts on the front and rear of the hot-melt adhesive beat H1 having a rectangular cross section.
[0018]
Referring to FIG.
An air interference portion Q is formed by the slit air-K1 acting before and after the hot melt adhesive beat H1 having a rectangular cross section. In the air interference section Q, the hot melt adhesive beat H1 is lowered while sandwiching the hot melt adhesive beat H1 in a sandwich shape with a pair of front and rear slit air around the hot melt adhesive beat, and the hot melt adhesive beat H1 The hot melt adhesive beat H2 is twisted approximately 90 degrees by the action of the slit air-K1 (see FIG. 10) and is twisted approximately 90 degrees in a rectangular direction across the application line. Further, by being stretched by the action of the descending slit air-K1, one filament fiber H3 of the hot melt adhesive is formed, and one filament fiber H3 of the hot melt adhesive descends toward the application line.
[0019]
As shown in FIGS. 11 and 12, the descending thread-like fiber H3 of the hot melt adhesive is in the vertical direction (application line advancing direction) in the air interference portion Q near the nozzle bottom surface, but has a deflection direction. It changes from a diagonal direction to a horizontal deflection.
[0020]
As shown in FIG. 13, the landing state on the base material on the application line (application state on the base material) is a horizontal run-out state due to a single hot melt adhesive thread-like fiber H4, and adjacent application patterns interfere with each other. No horizontal runout fiber H4. FIG. 13A shows an application surface of a single-strand, thread-like fiber that alternately bends right and left in a V-shape. FIG. 13 (b) shows an application surface of a single-stroke, thread-like fiber that is alternately bent in a U-shaped or semicircular shape.
[0021]
About the twisting action of the hot melt adhesive beet H1 shown in FIG.
As shown in FIG. 14, the hot melt adhesive hole 2 is changed from the pressurized air hole 5 to the shim plate 11 in FIG. When the shim plate 11A is inclined left and right, the twist direction can be restricted to a certain direction.
[0022]
In (a) of FIG. 15, in the pattern shown in FIG. 13, the adjacent left and right thread fibers H4 oscillate at the same timing, so that the adjacent thread fibers H4 do not interfere with each other and increase the application density. be able to.
In (b) of FIG. 15, the adjacent hot melt adhesive holes 2 are inclined in opposite directions, so that the adjacent left and right thread fibers H4 sway in opposite directions to each other. If the agent holes 2 are arranged in a honey, the adjacent filament fibers H4 will interfere with each other. The cross-thread yarns H4 on the base material surface intersect with the adjacent cross-thread yarn fibers H4 to generate overlapping portions to form a net shape, thereby increasing the strength of the application surface.
[0023]
The horizontal swing repeats violently and regularly, and the amplitude number changes according to the air pressure. The pressure of the air may be as small as 0.1 to 0.5 kgf / cm 2.
Since there is no intersection in the filament of the hot melt adhesive on the application surface, there is no overlapping portion of the filament. When applied to the manufacture of a bodily fluid absorbing product, a soft bonding surface can be formed, and a bodily fluid absorbing product that is soft and has good texture can be obtained.
[0024]
By changing the width of the slit air K1, the run-out width of the filamentous fiber H4 can be changed. The width of the slit air K1 can be easily selected by replacing a pressurized air effect shim plate (see FIG. 5) having a different slit width.
[0025]
The fan-shaped flight range before landing diverges in a fan-shaped manner at a distance of 10 mm to 30 mm from the nozzle in the flight direction, so that an appropriate coating width can be easily selected by adjusting the nozzle height.
[0026]
By controlling the pressure in conjunction with the speed of the coating material, the amplitude of the pitch changes. Therefore, it is also possible to perform a following operation in response to a change in the speed of the coating line.
[0027]
The application amount is 4 to 30 g / min per nozzle as a standard.
[0028]
【The invention's effect】
ADVANTAGE OF THE INVENTION This invention can reduce the supply amount of the pressurized air from a pressurized air hole, and can obtain the hot-melt bonding surface which has strong adhesive force with a smaller amount of hot-melt adhesives used.
Further, in the present invention, since the pressurized air hole opening is adjacent to the front side and the rear side of the hot melt adhesive hole opening, the cleaning action by the pressurized air to the hot melt adhesive hole opening causes the bottom surface of the nozzle chip to be pressed. By eliminating the need for removing and cleaning the adhered matter, and eliminating the removal and cleaning work after the operation is stopped, there is an effect that long-term continuous operation is enabled and the coating cost is reduced.
Since the applied surface has good ventilation and flexibility, when applied to the production of a product in which the adhesive applied surface comes into contact with the skin, such as a body fluid absorbing product, it can provide a product with good touch and high commercial value. Having.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an application nozzle device of a hot melt adhesive spray application device showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the same.
FIG. 3 is a bottom view of the same.
4A and 4B show a shim plate for forming a hot-melt adhesive hole group. FIG. 4A is a perspective view, and FIG. 4B is a sectional view taken along line S1-S1 in FIG.
5A and 5B show a shim plate for forming a pressurized air hole group. FIG. 5A is a perspective view, and FIG. 5B is a sectional view taken along line S2-S2 in FIG.
FIG. 6 is a front view showing an outline of a hot melt adhesive spray application device.
FIG. 7 is a plan view showing an outline of a coating line.
FIG. 8 is an explanatory diagram of the action of a slit air on a hot melt adhesive beat below the bottom surface of the application nozzle device according to the present invention.
FIG. 9 is a partially enlarged explanatory view of the operation explanatory view of FIG. 8;
FIG. 10 is an explanatory view of a twisting action of a hot melt adhesive beat in an air interference section Q.
11A and 11B are explanatory diagrams of the horizontal deflection action of the hot melt adhesive beat in the present invention, wherein FIG. 11A is shown in a transverse direction of an application line, and FIG.
FIG. 12 is an explanatory view showing a change in torsion of the hot melt adhesive beat shown in a cross-sectional view of FIG. 11 at an ABCDE point in FIG. 11;
FIG. 13 is a plan view showing an application pattern of a hot melt adhesive on the application line by the thread-like fibers, wherein FIG. 13A is an application surface of a single-stroke thread-like fiber alternately bent in a left and right V shape, and FIG. 4 shows an application surface of a single-strand, thread-like fiber alternately bent in a semicircular shape.
14 shows a shim plate of an embodiment different from the shim plate of FIG. 4, wherein FIG. 14A is a perspective view and FIG. 14B is a sectional view taken along line S3-S3 of FIG.
FIG. 15 is a bottom view of the application nozzle device similar to FIG. 3 using the shim plate of FIG. 14;
[Explanation of symbols]
REFERENCE SIGNS LIST 1 coating nozzle unit 2 coating nozzle hole 2A hot-melt adhesive hole group 5 pressurized air hole 5A compressed-air hole group K1 slit air H1, H2 hot-melt adhesive beat H3 hot-melt adhesive thread-like fiber H4 traverse thread-like fiber Q Interference part

Claims (6)

A number of hot-melt adhesive holes are arranged in the transverse direction of the application line to form hot-melt adhesive holes, and pressurized air holes are arranged before and after the hot-melt adhesive holes. In a hot melt adhesive spray coating method of spraying a hot melt adhesive by applying pressurized air from a pressurized air hole to a hot melt adhesive,
{Circle around (1)} The hot melt adhesive is discharged from the nozzle bottom opening of a number of hot melt adhesive holes having square holes having a rectangular cross section to form a hot melt adhesive beat having a rectangular cross section in the application line traveling direction,
{Circle around (2)} A slit air is formed by pressurized air discharged from the nozzle bottom opening of the pressurized air hole located in front and rear of each of the plurality of hot melt adhesive holes, and the slit air is formed into a hot melt having a square cross section. Act before and after the glue beat,
{Circle around (3)} A hot melt adhesive spraying method characterized in that the hot melt adhesive beat is lowered in a state of being sandwiched by scissors with a pair of front and rear slit air around the hot melt adhesive beat. A number of hot-melt adhesive holes are arranged in the transverse direction of the application line to form hot-melt adhesive holes, and pressurized air holes are arranged before and after the hot-melt adhesive holes. In a hot melt adhesive spray coating method of spraying a hot melt adhesive by applying pressurized air from a pressurized air hole to a hot melt adhesive,
{Circle around (1)} Hot-melt adhesive is ejected from the nozzle bottom opening of a number of hot-melt adhesive holes having square holes having a rectangular cross section to form a hot-melt adhesive beat having a rectangular cross section in the application line traveling direction. A slit air is formed by pressurized air discharged from the nozzle bottom opening of the pressurized air hole located in front and rear of each of the plurality of hot melt adhesive holes, and the slit air is formed into a hot melt adhesive beat having a square cross section. Act before and after
{Circle around (3)} The hot melt adhesive beat is lowered with a pair of front and rear slit air around the hot melt adhesive beat in a state where the hot melt adhesive beat is sandwiched by scissors,
{Circle around (4)} A hot-melt adhesive spray coating method characterized in that laterally oscillating thread-like fibers that do not intersect with each other are generated on the surface of a base material of an application line. A number of hot-melt adhesive holes are arranged in the transverse direction of the application line to form hot-melt adhesive holes, and pressurized air holes are arranged before and after the hot-melt adhesive holes. By applying pressurized air from the pressurized air hole to the hot melt adhesive, the hot melt adhesive spray coating device for spray coating the hot melt adhesive,
A large number of hot-melt adhesive holes having a square cross section are formed in parallel with the application line transverse direction, and adjacent to each hot-melt adhesive hole in the application line transverse direction, the front side of the hot-melt adhesive hole. And, on the rear side, a large number of pressurized air holes are formed at the front end and the rear end of the hot-melt adhesive hole opening near the center of the opening, and the front side and the rear side of the hot-melt adhesive hole are formed. A coating nozzle device for a hot melt adhesive spray coating device, wherein a number of pressurized air holes are formed on a side in a direction transverse to a coating line. The hot-melt adhesive hole is a rectangular cross-section rectangular hole in the application line advancing direction when viewed from the bottom of the nozzle. 4. The application nozzle device of the hot melt adhesive spray application device according to claim 3, wherein the hot melt adhesive hole is in a direction orthogonal to the pressurized air hole. 5. The hot-melt adhesive hole is a rectangular hole having a rectangular cross section that is inclined with respect to the application line traveling direction when viewed from the bottom of the nozzle. 4. The application nozzle device of the hot melt adhesive spray application device according to claim 3, wherein the hot melt adhesive hole is adjacent to the pressurized air hole and has a direction orthogonal to the pressurized air hole and an inclined direction. 5. A number of hot-melt adhesive holes are arranged in the transverse direction of the application line to form hot-melt adhesive holes, and pressurized air holes are arranged before and after the hot-melt adhesive holes. By applying pressurized air from the pressurized air hole to the hot melt adhesive, the hot melt adhesive spray coating device for spray coating the hot melt adhesive,
A large number of hot-melt adhesive holes having a square cross section are formed in parallel with the application line transverse direction, and adjacent to each hot-melt adhesive hole in the application line transverse direction, the front side of the hot-melt adhesive hole. And, on the rear side, a large number of pressurized air holes are formed at the front end and the rear end of the hot-melt adhesive hole opening near the center of the opening, and the front side and the rear side of the hot-melt adhesive hole are formed. On the side, a number of pressurized air holes are formed across the application line and:
In the vertical section of the application nozzle device in the application line direction, the pressurized air holes are positioned in front and rear of the hot-melt adhesive hole with respect to the vertical hot-melt adhesive hole, and are inclined at an acute angle. The application nozzle device of the hot melt adhesive spray application device.

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