JP2000034613A - Nozzle die for giving dense fiber board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle die in which the nozzle hole plate has vertical grooves bored on both faces in a zigzag arrangement independently from one another. SOLUTION: A nozzle hole plate is set between a pair of nozzle blocks to form a group of nozzle holes, while pressurized air holes are formed between the nozzle block and the air block. The air sprayed from the pressurized air holes are allowed to collide to the thermally melted resin extruded out of individual nozzles in the nozzle hole group to stretch the line screen of the resin to fibers with the airsucking effect of the sprayed air. In this case, vertical grooves are formed on both surface of the nozzle hole plate independently from one other in a zigzag arrangement in the cross section view thereby constituting nozzle hole groups that are arranged in zigzag and independent from one another. In the front view of the nozzle hole plate, the nozzle holes on the back face side are positioned between the nozzle holes on the front face side and the number of melt-extruded polymer lines is doubled and the interval between these polymer lines are narrowed almost half and dense fiber board can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing nonwoven fabric fibers and fibers by a melt blow method, or a method for applying a hot melt resin as a fibrous application surface.
More specifically, the present invention relates to a nozzle die for obtaining a dense fiber fiber by a melt blow method.

[0002]

2. Description of the Related Art As a nozzle die to which a melt blow method is applied, a pair of nozzle blocks 11,
The nozzle hole plate A is formed by interposing the nozzle hole plate 1 between the nozzle blocks 12, and the nozzle blocks 11, 12 and the air block 13,
14, a pressurized air hole B is formed, and a spray air from the pressurized air hole B is applied to a hot melt resin (for example, a hot melt hot melt adhesive) discharged from each nozzle hole of the nozzle hole group A. The fiber fiber is obtained by stretching the hot-melt resin h in the form of a drip which has been heated and melted from the group of nozzle holes by an air soccer effect by a spray air.

[0003]

Referring to FIG. 12, the nozzle holes p of the nozzle hole group of the nozzle hole plate 1 are formed by a hole processing method. That is,
The nozzle hole is constituted by a large number of through holes formed by forming a hole from the upper end to the lower end of the nozzle hole plate. There is a problem that the pitch of 0.4 mm (about 60 processing per 25.4 mm) is limited by the processing technology of the nozzle hole. Referring to FIG. 13, each nozzle hole p of the nozzle hole group of nozzle hole plate 1 is formed by a square groove processing method. That is, the nozzle hole is formed by a large number of square grooves formed by processing the skewered square grooves. Since the strength of the nozzle plate decreases due to the formation of the square groove, the pitch of the square groove is limited to 0.4 mm. That is, the known nozzle hole plate has a problem that the pitch of the nozzle holes is limited to 0.4 mm. In order to obtain a dense fiber fiber by the melt blow method, it is necessary to reduce the pitch of the nozzle holes of the nozzle hole plate. Therefore, the lower limit of the known nozzle hole plate, that is, 0.
It is an object to obtain a nozzle plate having a pitch smaller than the pitch of 4 mm.

[0004]

SUMMARY OF THE INVENTION The present invention provides a nozzle die characterized in that vertical grooves are formed on both sides of a nozzle hole plate in a zigzag arrangement (staggered arrangement) and independent from each other.

[0005]

According to the present invention, since the longitudinal grooves are present on both surfaces of the nozzle hole plate, the nozzle holes on the back surface are located between the nozzle holes on the front surface in the front view of the nozzle hole plate. Therefore, the number of heat-melted resin beats in the form of a sump discharged from the lower end of the nozzle hole and melted is doubled, and the interval becomes almost half, resulting in a dense fiber fiber.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. Referring to FIG. 1 and FIG.
The nozzle hole plate 1 of the embodiment has a front surface 1a and a rear surface 1b,
It is composed of a flat plate in which zigzag arrangement (staggered arrangement) and vertical grooves 2a, 2b independent of each other are formed. A resin passage hole 3 and a mounting hole 4 are formed in the nozzle hole plate (flat plate) 1.

FIG. 3 shows a coating apparatus equipped with the nozzle hole plate 1. As a nozzle die to which a melt blow method is applied, a nozzle die 10 includes a pair of nozzle blocks 11,
12, a nozzle hole group 1 is formed by interposing the nozzle hole plate 1 between the nozzle block 11 and the air block 13;
And a pressurized air hole B is formed between the nozzle block 12 and the air block 14, and a pressurized air supply hole 15 is formed in the air block 13 and the air block 14.
The nozzle block 11 is provided with a heater 16 and the nozzle block 12 is provided with a resin supply hole 17.
Through the resin passage hole 3 of the nozzle hole plate 1
Is provided with a resin lateral hole 18 communicating with the resin. A resin supply device (not shown) is connected to the resin supply hole 17 of the nozzle die 10 via a valve mechanism 20 and a resin hose 21, and the molten resin can be supplied freely by controlling the valve mechanism 20. In FIG.
Is a needle, 23 is a valve operating unit, and 24 is a heater.

Referring to FIGS. 4 and 5, a nozzle hole plate 1 'of the second embodiment is formed by integrating three plates, a front plate 1A, a core plate 1B and a rear plate 1C (adhesion and bonding). (By welding, etc.), and a large number of vertical grooves 2a, resin passage holes 3 and mounting holes 4 are formed in the front plate 1A. The rectangular resin window 5 is formed in the core plate 1B. A large number of vertical grooves 2b and mounting holes 4 are formed in the rear plate 1C.

In a state where the front plate 1A, the core plate 1B and the rear plate 1C are bonded and integrated to form the nozzle hole plate 1 ',
Referring to FIG. 5, square longitudinal grooves 2a and 2b are formed in a zigzag arrangement and formed independently of each other. Front plate 1 on core plate 1B
By integrating the A and the rear plate 1C, the front plate 1A and the rear plate 1C in which the vertical grooves 2a and 2b are present have sufficient strengths.

In the embodiment of the present invention, in the nozzle hole plate 1 of the first embodiment, referring to FIG. 6, the resin supply hole 17 is in the vertical groove 2b, the resin supply hole 17 is in the resin passage hole 3, the resin A molten resin (for example, a molten hot melt adhesive) is supplied to the vertical grooves 2 a through the horizontal holes 18 under the control of the valve mechanism 20. In the nozzle hole plate 1 'of the second embodiment, referring to FIG. 7, the resin supply hole 17 is inserted into the vertical groove 2b of the rear plate 1C, and the resin supply hole 17 is inserted into the core plate 1B.
The valve mechanism 2 is inserted into the vertical groove 2a through the resin passage window 5 of FIG.
A molten resin (for example, a molten hot melt adhesive) is supplied based on the control of 0.

At the lower end of the nozzle die 10, referring to FIG. 8, the molten resin (molten hot melt adhesive) discharged from the vertical groove 2a and the molten resin (molten hot melt adhesive) (2) The addition of the beat H2 doubles the molten resin (molten hot melt adhesive) beat from the nozzle die 10. The spray resin K acts on the molten resin (melted hot melt adhesive) beat H, and the molten resin fiber formed by the application of the melt blow method becomes finer fibers.

In the embodiment, the dimensions of the vertical groove, the flat plate, the front plate 1A, the core plate 1B and the rear plate 1C are as follows. Referring to FIG. 9, L1 = 0.1 to 0.3 mm L2 = 0.1 to 0.3 mm L3 = 0.2 to 0.5 mm L4 = 0.1 to 0.3 mm L5 = 0.1 to 0 In the above-described embodiment, the vertical groove forming the nozzle hole has a square or rectangular square groove in cross section.
As shown in (c), various shapes such as a triangle, a pentagon, and a U shape can be adopted.

Although the vertical grooves 2a and 2b have the same shape in the embodiment, they may have different cross-sectional shapes. Although the same shape is arranged for each of the vertical groove 2a and the vertical groove 2b, the shape (for example, the width of the groove) is different.
May be mixed and arranged. In the second embodiment, the front plate 1A and the rear plate 1C are protruded from the core plate, and the front plate 1A, the core plate 1B, and the rear plate 1C are integrated to form the nozzle hole plate 1 '. By setting the tip of 1B at the tip of the nozzle, the tip of the nozzle hole plate 1 'protrudes from the tip of the nozzle, and the spray air acts on the molten resin in the tips of the longitudinal grooves 2a, 2b of the nozzle hole plate 1'. Let me.

[0014]

According to the present invention, the lower end of the nozzle hole plate is formed in a zigzag arrangement (staggered arrangement) on the bottom surface of the nozzle hole plate because a large number of vertical grooves are present on both sides of the nozzle hole plate. In the production of fibers by the melt-blowing method, the number of heat-melted resin beats in the form of a splay that is discharged from the lower end of the nozzle hole doubles, and the spacing is almost halved. Fine fibers can be obtained compared to products. Further, the pressure of the pressurized air for producing the fibers can be reduced, so that the air flow rate can be greatly reduced and the running cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a nozzle hole plate showing a first embodiment of the present invention.

FIG. 2 is also a bottom view

FIG. 3 is a longitudinal sectional view of a coating apparatus equipped with a nozzle plate showing a first embodiment.

4A and 4B are front views of a nozzle hole plate showing a second embodiment of the present invention, wherein FIG. 4A shows a front plate, FIG. 4B shows a core plate, and FIG.

5 shows a nozzle hole plate showing a second embodiment in a state where a front plate, a core plate and a rear plate are integrated, FIG.
FIG. b is a bottom view, and FIG.

FIG. 6 is a longitudinal sectional view of the nozzle die showing the operation of the present invention, showing a case where the nozzle hole plate of the first embodiment is provided.

FIG. 7 is a longitudinal sectional view of a nozzle die showing the operation of the present invention, showing a case where the nozzle hole plate of the second embodiment is provided.

8A and 8B show a molten resin beat H1 and a molten resin beat H2. FIG. 8A is a front view of a nozzle hole plate, and FIG. 8B is a bottom view of the nozzle hole plate.

FIG. 9 is a dimension example of a vertical groove shown in a cross section of the nozzle hole plate of the first embodiment.

FIGS. 10A and 10B show various cross-sectional shapes of the vertical groove in the nozzle plate of the first embodiment, FIG. 10A shows a triangle, FIG. 10B shows a pentagon, and FIG.

FIG. 11 is a longitudinal sectional view of a coating apparatus equipped with a known nozzle plate.

FIGS. 12A and 12B show a nozzle hole plate formed by known nozzle holes, wherein FIG. 12A is a front view and FIG. 12B is a bottom view.

FIGS. 12A and 12B show a nozzle hole plate formed of a single flat plate having a well-known skewer groove, where FIG. 12A is a front view and FIG. 12B is a bottom view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle hole plate 1 'Slip hole plate 1A Front plate 1B Core plate 1C Rear plate 2a, 2b Vertical groove 10 Nozzle die A Nozzle hole group B Pressurized air hole H1 Molten resin beat H2 Molten resin beat K Spray air

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[Procedure amendment]

[Submission date] September 25, 1998 (1998.9.2)
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a front view of a nozzle hole plate showing a first embodiment of the present invention.

FIG. 2 is also a bottom view

FIG. 3 is a longitudinal sectional view of a coating apparatus equipped with a nozzle plate showing a first embodiment.

4A and 4B are front views of a nozzle hole plate showing a second embodiment of the present invention, wherein FIG. 4A shows a front plate, FIG. 4B shows a core plate, and FIG.

5 shows a nozzle hole plate showing a second embodiment in a state where a front plate, a core plate and a rear plate are integrated, FIG.
FIG. b is a bottom view, and FIG.

FIG. 6 is a longitudinal sectional view of the nozzle die showing the operation of the present invention, showing a case where the nozzle hole plate of the first embodiment is provided.

FIG. 7 is a longitudinal sectional view of a nozzle die showing the operation of the present invention, showing a case where the nozzle hole plate of the second embodiment is provided.

8A and 8B show a molten resin beat H1 and a molten resin beat H2. FIG. 8A is a front view of a nozzle hole plate, and FIG. 8B is a bottom view of the nozzle hole plate.

FIG. 9 is a dimension example of a vertical groove shown in a cross section of the nozzle hole plate of the first embodiment.

FIGS. 10A and 10B show various cross-sectional shapes of the vertical groove in the nozzle plate of the first embodiment, FIG. 10A shows a triangle, FIG. 10B shows a pentagon, and FIG.

FIG. 11 is a longitudinal sectional view of a coating apparatus equipped with a known nozzle plate.

FIGS. 12A and 12B show a nozzle hole plate formed by known nozzle holes, wherein FIG. 12A is a front view and FIG. 12B is a bottom view.

[Figure 13] shows the nozzle hole plate is constituted by a single flat plate having a known comb-like groove, a view is a front view, b view is a bottom view.

[Description of Signs] 1 Nozzle hole plate 1 'Slip hole plate 1A Front plate 1B Core plate 1C Rear plate 2a, 2b Vertical groove 10 Nozzle die A Nozzle hole group B Pressurized air hole H1 Molten resin beat H2 Molten resin beat K Spray air

Claims (3)

[Claims] 1. A nozzle hole group is formed by interposing a nozzle hole plate between a pair of nozzle blocks, and a pressurized air hole is formed between the nozzle block and an air block. A nozzle die that stretches the hot-melt resin that has been heated and melted from the nozzle hole group by the air soccer effect of the spray-air to make it into fibers by colliding the spray-melt resin from the nozzle holes with the hot-melt resin discharged from the hole. In the above, a vertical groove formed in a zigzag shape in cross section and independent from each other is formed on both surfaces of the nozzle hole plate, and a group of nozzle holes arranged in a zigzag shape and independent from each other is formed by the vertical groove. Nozzle die to obtain a suitable fiber fiber. 2. A nozzle plate having a plurality of vertical grooves formed on both sides of a single flat plate in a zigzag shape in cross section and independent of each other. The nozzle die for obtaining a dense fiber fiber according to claim 1, wherein a group of nozzle holes arranged in a zigzag manner and independent from each other is formed between the groove and the pair of nozzle blocks. 3. A nozzle plate comprising a front plate, a core plate, and a rear plate, which are integrated into a three-layer structure by integrating three flat plates, wherein a number of vertical grooves are formed in the front plate and the rear plate. The vertical groove of the rear plate and the vertical groove of the rear plate are arranged in a zigzag manner and are separated from each other by a core plate to be independent from each other. The nozzle die for obtaining a dense fiber fiber according to claim 1, wherein a group of nozzle holes arranged in a zigzag and independent of each other is formed.