JPS6094660A - Heat molding apparatus for producing nonwoven fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoforming device for thermoforming a fiber H aggregate mixed with heat-fusible fibers into a nonwoven fabric.

Conventionally, this type of thermoforming apparatus is shown in Fig. 1 W+B.
), as shown in the cross-sectional view of the main part, a plurality of stavers 3.
... are hung horizontally at appropriate pitches, and the staver 3
．． An endless conveying belt 4 made of wire mesh or the like is attached to 3... to constitute a conveying device 5, and hot air is supplied while the fiber h# aggregate 1 mixed with heat-fusible fibers is conveyed by the conveying belt 4. room 6
hot air suction chamber 7 from the slit nozzles 6a, 6a...
The fiber aggregate 1 is heated and formed by passing hot air (for example, 120 to 150°C) through the fiber assembly 1. However, the conventional thermoforming apparatus has a processing speed of 3On+/min.
Production capacity was low because it had to be as follows. This is because forced lubrication is required to run the endless chain 2゜2 at a speed of 30 Ill/1n or more in a high temperature atmosphere, but forced lubrication is necessary to prevent the lubricant from scattering and to lubricate the fibers. Endless Chain 2.2 Due to the lack of suitable solutions to avoid contaminating the assembly with lubricating oil
This is because it is not possible to run the vehicle at a speed of 30m/1n or more.

Therefore, although not shown in the drawings, it is conceivable to use a conveyance device in which an endless conveyance belt made of synthetic resin filament fabric is stretched between reversing rolls without using auxiliary means such as chains. However, in order to run the endless conveyor belt stably at a high speed of 301/1n or more,
It is necessary to use a meandering adjustment device that swings a reversing roll or the like. However, running an endless conveyor belt in a high-temperature atmosphere while adjusting the meandering with a meandering adjustment device causes large elongation strain in both ends of the endless conveyor belt in a short period of time, making it difficult to adjust the meandering. At the same time, it is impossible to obtain a smooth conveying surface suitable for conveying the fiber aggregate, so that it cannot be used for a long period of time and is therefore unsuitable as a thermoforming apparatus.

The present invention achieves 120II+/mi, which was previously considered impossible.
The object of the present invention is to provide a thermoforming apparatus for producing nonwoven fabrics that can achieve a processing speed of n3-.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a thermoforming apparatus for producing a nonwoven fabric according to the present invention (hereinafter referred to as the apparatus of the present invention) will be explained with reference to embodiments shown in the drawings. FIG. 2 is a right-hand partial sectional view with the middle omitted, showing an embodiment of the apparatus of the present invention, and numeral 11 in the figure is a conveying device. The conveying device 11 includes an endless conveying belt 14 stretched between a reversing roll 12 on the entrance side and a driving reversing drum 13 on the exit side, and guide rolls 16, 16, and 16 at appropriate locations.
... is installed. The conveyor belt 14 is made of a synthetic resin filament fabric connected in an endless manner, for example, the filament material is polyester, the vertical and horizontal filament diameters are 0.4 φ, and the weight is 0.45 ki/ Planet (trade name) manufactured by Nippon Filcon ■ is used.The reversing roll 1
2 is an appropriate tension on the conveyor belt 14 (for example, 30 to 40
To! /11) is pivotally supported by a pickup 15.15 with a compression coil spring. In the drive reversing drum 13, the cylindrical portion 13a has air permeability, and the opening 13c of the side plate 13b and the suction port of the cooling fan (not shown) are brought close to each other, and the outer peripheral portion of the cylindrical portion 13a is The structure is such that air is sucked into the drum to cool the heat-formed nonwoven fabric 1'. Moreover, inside the drive reversing drum 13,
A sealing plate 13d for improving the sealing performance to the area not covered with the nonwoven fabric 1' and a uniform air velocity distribution in the width direction of the cooling air in the area C covered with the nonwoven fabric 1'. A perforated rectifying plate 13f is supported on a drum shaft 13e. As shown in FIGS. 3 and 4, the conveyance belt 14 has a guided protrusion 17a on the longitudinal side edge of the non-conveyance side.
, 17a... are provided protrudingly along the longitudinal direction at an appropriate pitch P (for example, P=30 to 501 m). The guided protrusion 17a is provided with a reinforcing cloth 18 at the edge of the conveyance belt 14.
After sewing, the hook 17 with protrusion is attached to the reinforcing cloth 18 to form it. A guide wall for preventing meandering is formed at a suitable position in the endless passage B through which the guided projection 17a passes. The meandering prevention guide wall is formed at the reversing roll 12. The drive reversing drum 13.degree. guide rolls 16, 16... and the entrance/exit section 6- of the heating device 20 are preferred. The structure of the guide wall for preventing meandering includes a reversing roll 12. Drive reversing drum 13 and guide roll 1
6.16... has annular grooves 12a, 16a
(The grooves of the driving reversing drum 13 are omitted from the drawings) are formed by recessing each of them, and the grooves 19a of the guide block 19 consisting of appropriate grooves are formed at the entrance and exit portion of the heating device 20 to form the endless passage B. It is configured according to the following. In the figure, 31 is a backup roller, which is the guided projection 17a.
This is to prevent the groove from jumping out of the groove 19a.

As shown in FIG.
The heating chambers 21, 21... are divided along the conveyance direction.
A heating device 20 consisting of the following is provided. Each heating chamber 21
As shown in FIG. 5, the hot air suction chamber 22 is divided into a hot air supply chamber 22 formed above the conveying surface of the conveying belt 14 and a hot air suction chamber 23 formed below the non-conveying surface of the conveying belt 14. Connecting the discharge port 23a opened to the chamber 23 and the suction port 24a of the circulation fan 24 via the damper 25,
The pressure chamber 24b of the circulation fan 24 and the supply D22e of the hot air supply chamber 22 are connected via a heat exchanger 26 so that hot air at a predetermined temperature passes through the conveyance zone 14 from above to below. The hot air supply chamber 22 has almost the entire surface facing the conveying surface of the conveying belt 14 as a hot air discharge area fA 22b, and has a hot air discharge area 22b and an upper hot air flow area 2.
20, the two rectifying partition walls 27 form a rectifying gap 22d.
(for example, Hl-50 to 150 mm). The rectifying partition wall 27 has a hot air discharge area 22b.
A perforated plate 27a having a porous area of approximately the same area as the conveyance belt 14 is disposed approximately parallel to the conveying belt 14, and a fiber assembly layer 27b having air permeability is provided on the perforated plate 27 so as to cover the entire porous area.
It is configured by placing it on top of a. The fiber assembly layer 27b is made of one or more layers of nonwoven fabric made of heat-resistant fibers such as polyester fibers. The fiber assembly layer 27
The thickness and passing resistance of b are appropriately selected depending on the thickness of the fiber aggregate 1 and the hot air velocity.
The wind speed is 0.5 to 1.7111 when the wind is 15a+m.
/'See ventilation resistance of 0.6 to 2,
Three layers of 0 m tll water column nonwoven fabric are used in the upper layer, and one layer is used in the lower layer. seal plates 22f forming both sides of the hot air discharge area 22b;
22f has its lower edge hanging down to a position close to the conveyance belt 14, and is configured to prevent cold air from outside of the hot air supply chamber 22 from leaking into the hot air suction chamber 23 through the conveyance belt 14. be. In the hot air suction chamber 23, a hot air suction area 23b is formed at a position facing the hot air discharge area 22b via the conveyance belt 14, and between the hot air suction area 23b and a lower hot air discharge area 23c. A rectifying partition wall 28 is provided with a rectifying gap 23d (for example, H2=50 to 150 mm) between the conveyor belt 14 and the conveyor belt 14. The rectifying partition wall 28 has a perforated plate 28a having a perforated area approximately the same as the hot air suction area 23b, which is arranged approximately parallel to the conveyance belt 14, and has air permeability so as to cover the entire perforated area. The fiber assembly layer 28b is attached to the perforated plate 28a.
It is constructed by placing it on top of the The m-set collective layer 28b is
Like the fiber assembly layer 27b, it is made of one or more layers of nonwoven fabric made of heat-resistant fibers such as polyester fibers. Both side frames 23 with sealing properties form the hot air suction area 9-8-23b of the hot air suction chamber 23.
Longitudinal guide rails 29, 29 for guiding the conveyor belt 14 are disposed above e and 23e, and are arranged at an appropriate pitch (for example, , 100011+01 pitches), guide rails 30 having a V-shaped plane are arranged at appropriate pitches on top of the connection frame 23f. In addition, the conveyance belt 14
When the tensioning distance is short, the navigation guide rail 29 is not required, and furthermore, when the width dimension of the conveyance belt 140 is small, the guide rail 30 is not required. On the operating side of the hot air suction chamber 23, an inspection 123g is provided for replacing or inspecting the fiber/lit collecting layer 28b. An inspection leg 21a (see FIG. 2) is provided on the operation side of the heating chamber 21. Reference numeral 31 in FIG. 2 denotes an interference chamber for preventing the nonwoven fabric 1' from climbing up from the conveyance belt 14 due to hot air leaking from the outlet of the heating chamber 21, and is sucked into the surface facing the conveyance belt 14. Slits 31a, 31
a... is provided, and the interior is connected to the hot air suction chamber 23 by piping.

Next, the effects of the device of the present invention will be explained. Conveyance 10 - The belt 14 runs stably without meandering as the drive reversing drum 13 is driven, with the guided protrusions 17a, 17a, . . . being guided by the meandering prevention guide wall. The circulating air generated by the rotation of the circulation fan 24 is transferred to the heat exchanger 26.
While passing through the
) and is supplied to the hot air flow area 22c of the hot air supply chamber 22. The hot air supplied to the heat m inflow city 22c is
Upper rectifying partition wall 27. The flow is rectified while passing through the rectification gap 22b and the lower rectification partition wall 27, and the hot air discharge area 1
ti 22b to uniform wind speed distribution (e.g. 0.5 to 1
．． The fiber N on the conveyor belt 14 as hot air of 7+ll/5ec)
It is discharged to the aggregate 1. The discharged hot air passes through the fiber aggregate 1 and the conveying belt 14 and is sucked into the hot air suction area td 23b of the hot air suction chamber 23 in a uniform air velocity distribution state. This is because even if the negative pressure distribution in the hot air discharge area 23c is uneven, the suction negative pressure distribution in the hot air suction area 23b becomes uniform due to the rectifying action of the rectifying partition wall 28 and the rectifying gap 23b.

The inventor conducted an experiment under the following conditions and obtained the following results.

[Experimental conditions]

(1) Fiber aggregate ■ Blend rate Heat-sealable fibers made of polypropylene, etc.: 50% Heat-resistant fibers made of polyester, etc.: 50% ■ Fabric weight: 20 g/■ Laminated structure: 2 layers crossed Layer ■ Width dimension -24O0a+o+ (2) Heating chamber configuration 1 room has 3 rooms with a length of 2400 mm (3) Hot air speed and temperature 135°C at -1.5 m/sea in the 1st room 2nd room 1.
5 Ill/sec at 135℃ 3rd room -1.5m/s
135℃ (4) with EC Cooling conditions■ Drive reversing drum diameter...1000IllIIlφ■
Cold air passing speed: 2.0 IIl/SeC11- (5) Processing speed: 60 to 120 m/min [Experimental results] The obtained nonwoven fabric was uniformly heat-fused over the entire surface, and no heat was generated during uneven heating. No striped patterns were formed.

As detailed above, the v4 arrangement of the present invention has the following excellent effects.

■ Guided protrusions are protruded at appropriate pitches from the longitudinal edge of the non-conveyance side of the conveyor belt, and the guided protrusions run while being guided by a guide wall to prevent meandering, so the conveyor belt can move at low speeds without meandering. Stable running can be maintained from low to high speeds, and production capacity can be improved.

■ Since the conveyor belt is composed of a woven synthetic resin filament, the thermal conductivity of the conveyor belt and the thermal conductivity of the fiber aggregate are approximately equal to each other, and it is possible to use a nonwoven fabric with almost the same texture on both sides. Obtainable.

■ A plurality of partition walls for rectification are arranged with a rectification gap in the hot air supply room, and at least one partition wall for rectification is arranged in the hot air suction room with a rectification gap. As a result, the hot air velocity distribution passing through the fiber aggregate becomes uniform over the entire fiber assembly, making it possible to obtain a nonwoven fabric with stable quality and no uneven heat fusion.

■ In the conventional slit nozzle method, the fiber aggregates are locally lifted up from the conveyor belt by the local negative pressure generated on the fiber aggregates when the hot air blown onto the fiber aggregates diffuses. However, the disadvantage was that the nonwoven fabric had local distortion. However, in the present invention, 1. #A The hot air that passes through the miscellaneous aggregate passes over the fiber aggregate at a uniform speed to the feeding surface side, so the fiber aggregate does not fly up locally from the conveying zone and a nonwoven fabric with stable quality without local distortion is obtained. be able to.

[Brief explanation of drawings]

Figure 1 (8) is a front sectional view of the main parts of a conventional thermoforming device;
The same figure (81 is a right sectional view of the main part of the same as above, FIGS. 2 to 6 show a 14-embodiment of the thermoforming apparatus for manufacturing non-woven fabric according to the present invention, and FIG. 2 is a partial cross-section with the middle omitted) The right side view and box 3 are an enlarged perspective view of the inlet of the conveyance device, FIG. The figure is an enlarged perspective view of the cross section without showing the arrangement of the flow rectification partition wall. 14... Conveyance band 17a... Guided protrusion B... Endless passage b... Guide wall for preventing meandering 22...
・Hot air supply chamber 22b...Hot air discharge area 22c...
Hot air flow area 22d... Rectification gap 23... Hot air suction chamber 23b... Hot air suction area 23c... Hot air discharge area 27.28... Rectification partition wall Patent applicant Kao Soap Co., Ltd. Inoue Representative of Metal Industry Co., Ltd. Patent attorney 1) Toshihiko 15- Figure 1 (A)

Claims (1)

[Claims] 1. While conveying the fiber aggregate mixed with heat-fusible fibers in an endless conveyor belt with air permeability, hot air is applied from the surface of the fiber M east assembly to the non-conveyor side of the conveyor belt. The fiber [i
In a thermoforming device that heat-forms the combined material to form a non-woven fabric, the conveyance belt is made of a synthetic resin filament woven fabric, and guided protrusions are protruded at appropriate pitches on the longitudinal edge of the non-conveyance side. 1. A thermoforming apparatus for manufacturing a nonwoven fabric, characterized in that a guide wall for preventing meandering is provided at a suitable position in an endless passage through which the guided protrusion passes. 2. While conveying the mttn aggregate mixed with heat-fusible fibers in an endless conveyor belt with air permeability, hot air is passed from the surface of the fiber aggregate to the non-conveying side of the conveyor belt, and the w
In a thermoforming device that heat-forms a four-fiber union to form a nonwoven fabric, the conveyance belt is made of a synthetic resin filament fabric, and guided protrusions are projected at appropriate pitches on the longitudinal edge of the non-conveyance side. A guide wall for preventing meandering is provided at a suitable position in the endless path through which the guided protrusion passes, and a hot air discharge area is formed on the outer side of the conveying surface of the conveying belt and substantially the entire surface facing the conveying surface. First, a hot air supply chamber is provided, and between a hot air flow area formed in the hot air supply chamber and a hot air discharge area, there is provided a rectifying layer made of a fiber aggregate layer having air permeability and having a shape substantially in the same plane as the hot air discharge area. A plurality of partition walls are arranged with a rectification gap between the opposing partition walls for rectification,
A hot air suction chamber having a hot air suction area formed at a position facing the hot air discharge area through the conveyance band is provided on the outside of the non-conveying surface of the conveyance belt, and a hot air suction chamber is provided with a hot air suction area formed inside the hot air suction chamber. At least one rectifying partition wall made of a single set of air-permeable fibers and having substantially the same planar shape as the hot air suction area is disposed between the suction area and the conveying belt with a rectifying gap. A thermoforming device for producing nonwoven fabrics.