JPS5818463A - Heating and 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 is woven fabric 1111 which is a blend of thermal and nursing care material. The present invention relates to a thermoforming device for thermoforming a composite material to form a nonwoven fabric.

Conventionally, this thermoforming apparatus has a single-sided hot air blowing method, as shown in FIG. 1, which blows hot air only onto the surface of a fiber aggregate 1 supported by a conveyor 3 and heat-forms it to produce a nonwoven fabric 2. 2, and two heating rolls 4 in which heating oil is circulated around the fiber aggregate 1, as shown in FIG.
．． There is a contact heat transfer type thermoforming apparatus that produces a nonwoven fabric 2 by sandwiching the nonwoven fabric 2 between the nonwoven fabrics 2 and 4. However, the conventional thermoforming apparatus described above has the following drawbacks.

(1) As shown in FIG. 1, hot air blowing on one side is a disadvantage of the thermoforming apparatus.Due to heating on one side, the texture of the conveyor surface of the nonwoven fabric 2 and the surface blowing hot air are significantly different.

b. Since it is a national problem to externally control the thermal contraction of the fiber aggregate 1 during heating, the width and thickness of the nonwoven fabric 2 are non-uniform, resulting in poor quality nonwoven fabric 2. becomes.

In C0 spraying, if the speed of hot air is increased, surface peeling, wrinkles, etc. of the fiber aggregate 1 will occur, so the speed of spraying must be extremely low, making it impossible to improve production capacity.

(2) Disadvantage d of the contact heat transfer type thermoforming apparatus as shown in FIG. 2: Especially in the case of a thick fiber aggregate 1, only the surface heating progresses rapidly, and sufficient heat fusion cannot be achieved in the center.

e. In order to uniformly fuse the fiber assembly 1 from the surface to the center, it is necessary to exclude air that has a heat insulating effect from inside the fiber assembly 1, so it is necessary to thoroughly fuse the fiber assembly 1 to the inside. It is impossible to manufacture a nonwoven fabric 2 with such high bulk.

In order to eliminate the above-mentioned drawbacks, the present invention provides at least one set of conveying devices for sandwiching and conveying a fiber aggregate, which are arranged with breathable conveying surfaces facing each other, and a non-conveying device for each of the opposing conveying surfaces. It is an object of the present invention to provide a thermoforming device for producing a nonwoven fabric, which includes a hot air supply device on the contact surface side that supplies heated air to the fiber m* coalescence through each conveying surface.

The present invention will be described below based on drawings showing embodiments thereof.

FIG. 3 is a side cross-sectional view of a thermoforming device for producing nonwoven fabric according to the present invention (hereinafter referred to as the device of the present invention), in which a fiber aggregate 1
The conveyor @@20G consists of an endless upper conveyor 201 and a lower conveyor 202, and penetrates through the inside of the hot air supply device 1300 to provide an inlet section 203 and an outlet section 204 on the outside. The fiber aggregate 1 supplied from the entrance crossing conveyor 6 is conveyed from the inlet section 203 into the hot air supply device 300, and the nonwoven fabric 2 heated and formed from the fiber aggregate 1 while passing through the hot air supply device 30G is transferred to the outlet section. 20
4 to an exit crossing conveyor 7. From the inlet section 203 to the outlet section 204 of the conveying device 200
The structure up to the side walls 301. of the hot air supply device 300 is as shown in FIG. 4, which is an enlarged front view of the conveying section of the conveying device 200 in a sectional view taken along the rV-IV line in FIG. 301
and both sides W301. An upper rail 205, which is movable up and down, is attached to a frame (not shown) extending in the front-rear direction from 301. 205 and a fixed lower rail 206.
206, two endless upper chains 20 each
7 and the lower chain 208 move in synchrony, and the upper and lower chains 207. Upper staver 210 attached to left and right attachments 209 of 208, respectively
An upper conveyor belt 212 and a lower conveyor belt 213, each of which is made of canvas, wire mesh, etc. whose main surfaces at least have air permeability, are attached to the lower stubber 211 by appropriate means with their respective conveyor surfaces facing each other with a predetermined distance . It is. Furthermore, as shown in FIG. 3, the upper conveyor 201 of the entrance section 203 becomes more vertically conveyed as it approaches the crossover conveyor 6 side.
The upper rail 205 is bent upward so that III of 202 becomes wider to facilitate insertion of the fiber aggregate 1.

Moreover, the upper and lower rails 205. A reversing sprocket 214 that is movable up and down and a fixed reversing sprocket 215 are provided at each end of the reversing sprocket 205, respectively. Conveying device 20 other than the above
0 structure, upper and lower chains 207 . 209 is held. Inside the hot air supply device 300, heated air generated by appropriate means is supplied to the upper surface of the upper conveyor 201 and the lower surface of the lower conveyor 2, respectively.
An upper supply chamber 302 and a lower supply chamber 303 are provided in which a suitably shaped nozzle 304 is formed to spray onto the lower surface of the fiber assembly 02 (that is, the side of the non-contact surface with the fiber aggregate 1). Note that a cold air supply device or other appropriate cooling device 5 may be provided on the exit side of the hot air supply device 300 in order to more reliably form the nonwoven fabric 2.

Although not shown in the drawings, a canvas in which the conveyance device is held on a holding roll or the like without using a conveyance chain or the like,
It consists of an upper conveyor and a lower conveyor made of a belt such as a wire mesh whose main surface is permeable at least, and if necessary, a cooling conveyor. Non-woven fabric 2
from the outlet section 204 to the outlet crossing conveyor 7, and both sides 1301 of the hot air supply device 300
゜301 and both sides! 301. 301, which is attached to a frame (not shown) extending in the front-rear direction, is provided with a vertically movable upper holding port and a fixed lower holding roller.
Of course, it is also possible to make the height of the upper and lower conveyors adjustable. Also, the upper conveyor belt 212 shown in FIG.
The surface of the lower conveyor belt 213 that comes into contact with the IIN aggregate 1 has a mesh-like net structure made of a material with low thermal conductivity such as polypropylene, polyester, or cotton, or a conveyor belt made of a resin with low thermal conductivity such as polypropylene or polyester. The coating structure is coated so as not to block the ventilation holes provided in the coating structure, and furthermore, a release agent layer made of silicone resin or the like is formed on the surface of the laminated structure or coating structure to make it breathable. The apparatus of the present invention constructed as described above is used as follows: After mixing an appropriate amount of heat-fusible fibers, the web is formed by an appropriate card forming method (without water circulation). Molded fiber aggregate 1
After passing through the entrance crossing conveyor 6, the hot air supply device*30G is sandwiched and conveyed by the conveyor 20G, and the air is supplied from the upper and lower supply chambers 302 and 303.
The fiber aggregate 1 is heated and formed by blowing heated air at 0 to 150° C. on both sides of the fiber aggregate 1.
The cooled cloth 2 is transferred from the conveying device 200 to the exit conveyor 7. The thickness adjustment of the nonwoven fabric 2 is performed using an upper conveyor 201 shown in FIG. This is done by adjusting the height of 202.

The apparatus of the present invention constructed as described above has many excellent effects as follows.

■ Both sides of the fiber aggregate are heated and formed under the same conditions.
It is possible to make one nonwoven fabric with the same texture on both sides.

@ The machine that heat-forms the fiber aggregate is the Wil! Since both surfaces of the set are held between upper and lower conveyors, heat shrinkage in the width and traveling direction of the set assembly can be suppressed, and a nonwoven fabric of uniform quality can be produced.

o During hot forming by blowing hot air onto the sin aggregate,
Since the fiber aggregate is always held between the upper and lower conveyors, even if the heating rate is increased by increasing the hot air blowing speed or passage speed, the fiber aggregate will not peel or wrinkle, etc. It is possible to shorten the heating time and increase the production speed, and if the contact surfaces of the upper and lower conveyors with the fiber aggregate are made of a material with low thermal conductivity, the hot air temperature can be increased (even if the non-woven fabric Production speed can be further increased without impairing surface texture.

(2) Since hot forming is performed by blowing hot air into the mii aggregate, it is possible to produce a bulky nonwoven fabric that is sufficiently fused to the inside and uniformly over the entire area.

[Phase] The thickness of the nonwoven fabric can be adjusted freely by adjusting the gap between the upper and lower conveyors.

G Since the fiber aggregates are held and conveyed by the upper and lower conveyors, there is no restriction on the posture of the upper and lower conveyors (the layout of the entire nonwoven fabric manufacturing apparatus can be freely arranged).

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventionally known thermoforming apparatus for producing nonwoven fabrics, FIG. 2 is a side view of main parts of a conventionally known thermoforming apparatus for producing nonwoven fabrics in another embodiment, and FIG. 3 is a side view of a conventionally known thermoforming apparatus for producing nonwoven fabrics. FIG. 4 is a side sectional view showing an embodiment of the heat forming apparatus of the nonwoven fabric manufacturing apparatus, and FIG. 1... Fiber aggregate 2... Nonwoven fabric 200... Conveying device 300... Hot air supply/discharge device Fig. 1 Fig. 3■ Fig. 2

Claims (1)

[Claims] 1. Heat-visibility In a thermoforming device that heats and molds a fiber aggregate mixed with coarse material to form a nonwoven fabric, the air-permeable conveying surfaces are arranged facing each other, and the fiber aggregate is held and conveyed. and a hot air supply device having a hot air blowing nozzle disposed on the non-contact side of each of the two inner conveying surfaces to supply heated air to the fiber aggregate through each conveying surface. A thermoforming device for producing nonwoven fabrics.