JPH02167698A - Method and device for cutting nonwoven fabric - Google Patents

Abstract

PURPOSE:To cut by punching a nonwoven fabric with high accuracy and at high speed and to obtain a desired nonwoven fabric product by cooling after heating and pressing the specified width part including the contour shape of a nonwoven fabric product and cutting the cooled nonwoven fabric according to the specific width part. CONSTITUTION:In case of punching a unwoven fabric product 7 from a nonwoven fabric 2, the specific width part including the contour shape of the nonwoven fabric product 7 is melted by pressing by heating by a heating roller 4 and a sheet like part is formed first. Then after solidifying the sheet like part by cooling by a cooling roll 5, it is cut by a cutting roll 8 in a conformity with the sheet like part. As a result, the punching is easy even in case of what is difficult to be cut by a rotary die like the nonwoven fabric 2 and yet what is of the specified shape can be obtd. with high accuracy without receiving any thermal effect at the punching time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a nonwoven fabric cutting method and device for punching a nonwoven fabric into a predetermined shape, and in particular, to a nonwoven fabric cutting method and apparatus for punching a nonwoven fabric into a predetermined shape. The present invention relates to a cutting method and device.

(Prior Art) Nonwoven fabrics, particularly nonwoven fabrics containing thermoplastic resins, are widely used as liners for floppy disks, sanitary napkin packaging, and the like.

When using nonwoven fabrics as these liners or packaging bodies, it is necessary to cut them into predetermined shapes.

As a cutting method and device, the rotary gui method has been widely used. This method is 41! The product is continuously obtained using a rotary die that cuts a --shaped nonwoven fabric and punches it into a predetermined contour.

[Problems to be Solved by the Invention] However, in the cutting using the rotary guide method described above, it was not possible to accurately cut according to the contour of a predetermined shape, depending on the flexibility and thickness of the nonwoven fabric. Therefore, instead of cutting the nonwoven fabric alone, it has been overlapped with a paper or resin sheet and then cut to obtain the precision required.

Further, in the conventional cutting method, short fibers contained in the nonwoven fabric are dispersed from the cut surface, resulting in dust generation.

Therefore, an object of the present invention is to provide a method and apparatus for cutting a nonwoven fabric that can cut a nonwoven fabric with high precision and high speed to obtain a desired nonwoven fabric product by punching.

[Means to solve the problem]

The present invention is a nonwoven fabric cutting method in which continuously supplied strip-shaped nonwoven fabric is cut and punched out as a nonwoven fabric product of a predetermined shape. The above object has been achieved by providing a method for cutting a nonwoven fabric, which is characterized in that the nonwoven fabric is cut according to the predetermined width portion.

The present invention also provides an apparatus for suitably carrying out the above-mentioned method of the invention,
That is, in a nonwoven fabric cutting device that cuts continuously supplied strip-shaped nonwoven fabric and punches it out as a nonwoven fabric product of a predetermined shape, the heating roll heats and presses a predetermined width portion including the contour shape of the nonwoven fabric product, and the heating roll A cooling roll disposed downstream of the cooling roll to cool the heated nonwoven fabric, and a cutting roll disposed downstream of the cooling roll cutting the nonwoven fabric according to the predetermined width portion. A nonwoven fabric cutting device is also provided.

[Effect]

According to the present invention, a continuously supplied nonwoven fabric is heated and pressed with a heating roll to form a molten portion having a predetermined width in the contour shape of a nonwoven fabric product, and after the nonwoven fabric after the heating and pressing treatment is cooled. The predetermined width portion can be cut using a cutting roll and punched out as a nonwoven fabric product in a predetermined shape.

[Example] The present invention will be described below based on the example shown in FIGS. 1 to 7. Among the figures, FIG. 1 is a side view showing the overall configuration of an apparatus according to an embodiment of the present invention suitable for carrying out the nonwoven fabric cutting method of the present invention, and FIGS. 2(a) and (b) are respectively A perspective view showing the heating roll of the apparatus of this embodiment and a sectional view showing the nonwoven fabric treated by the heating roll, FIG. 3(a),
(b) is a perspective view showing the cutting roll of the apparatus of this embodiment, a cross-sectional view showing the main part in a state of cutting a nonwoven fabric, and a fourth
The figure is a partial perspective view of the apparatus of this embodiment showing a state in which a cut nonwoven fabric product is separated from a nonwoven fabric, FIGS. 5(a) and 5(a),
(C) is a sectional view showing a nonwoven fabric product manufactured by the apparatus of this embodiment, FIG. 6 is a side view showing the overall configuration of another embodiment of the apparatus of the present invention, and FIGS. 7(a) to (d) ) are a plan view and a sectional view showing a nonwoven fabric product manufactured by the embodiment apparatus shown in FIG. 6.

As shown in FIG. 1, the apparatus of this embodiment includes a pair of feed rolls 3.3 that pull out the nonwoven fabric 2 from the raw fabric roll l, and a heating press as described below on the nonwoven fabric 2 supplied by the feed rolls 3.3. A heating roll 4.4 for performing the treatment, a pair of cooling rolls 5.5 sequentially disposed in the flow direction for cooling the nonwoven fabric 2 treated by the heating roll 4.4;
a cutting roll 8 for cutting the nonwoven fabric 2 cooled by the cooling roll 5.5 to punch it out as a nonwoven product 7 on an anvil roll 6 according to the heat treatment area, and contacting the anvil roll 6 on the downstream side of the cutting roll 8; A tensicon cut roll 9 is disposed to adjust the tension of the remaining nonwoven fabric 2 after punching out the nonwoven fabric product 7, and a tensicon cut roll 9 is disposed in contact with the anvil roll 6 on the downstream side of the tension cut roll 9 to control the nonwoven fabric 7. It is equipped with a separation nip roll 10 for separation. Furthermore, the apparatus of this embodiment includes a shoe 12 disposed below the anvil roll 6 for supplying the separated nonwoven fabric product 7 to a conveyor 11 for transferring it to the next process;
1 pair of nip rolls for tension adjustment
3 and a take-up roll 14 for winding the paper.

Further, the nonwoven fabric 2 is made to hang down between the raw fabric roll 1 and the feed roll 3.3 as shown in FIG. 1, and the stress remaining in the nonwoven fabric 2 is temporarily removed. After the stress remaining in the wound nonwoven fabric 2 is once removed, the nonwoven fabric 2 is pulled out by a feed roll 3.3 and delivered to a heating roll 4.4 on the downstream side. By removing residual stress in the nonwoven fabric 2 in this manner, subsequent shrinkage is not caused, and the cutting accuracy of the nonwoven fabric product 7 by the cutting roll 8 is increased. Furthermore, in order to prevent unnecessary hanging of the nonwoven fabric 2, a plurality of detectors 15 for detecting the folded end of the nonwoven fabric 2 are arranged in the vertical direction on both sides of the hanging nonwoven fabric 2, and detect the folded edge of the nonwoven fabric 2. By doing so, the amount of drooping is controlled.

In addition, the feed roll 3 is heated by the heating roll 4.4 adjacent to the downstream side, so that the temperature of the feed roll 3 increases.
．． The nonwoven fabric 2 to be delivered to the nonwoven fabric 2 is heated and expanded.
There is a possibility that the feed amount may be changed and the dimensional accuracy of the nonwoven fabric product 7 may be reduced. Therefore, a temperature controller (not shown) is installed in the feed roll 3 to maintain a constant temperature and always deliver a constant amount of the nonwoven fabric 2 to the heating roll 4.4. I'm trying to form an outline.

In addition, as shown in FIG. 2(a), the heating rolls 4.4 each have a nonwoven fabric product 7 on the surface of one of the heating rolls 4.
A convex shape exhibiting an outline shape, in this example, a circular convex shape 4A
When the nonwoven fabric 2 is pressed with this heating roll 4 and the other heating roll 4, a portion corresponding to the convex shape 4A is formed on the nonwoven fabric 2, as shown in the cross section of FIG. 2(b). It is melted to form a sheet-like portion 2A and flowed down.

Then, the nonwoven fabric 2 is cooled by a cooling roll 5.5 located continuously on the downstream side of the heating roll 4.4 to harden the sheet-like portion 2A and then delivered to the cutting roll 8.

As shown in FIG. 3(a), the cutting roll 8 has a die cutting edge 8A protruding from the surface of the cutting roll 8 that conforms to the contour shape of the nonwoven fabric product 7. The die cutting edge 8A bites into a sheet-like portion 2A of a constant width that conforms to the outline shape of the nonwoven fabric product 7 formed on the nonwoven fabric 2, as shown in an exaggerated manner in FIG. 3(b).
It is designed to cut the nonwoven fabric product 7. When cutting, in order not to reduce the dimensional accuracy of the nonwoven fabric product 7 to be punched, the nonwoven fabric fabric 7 and the remaining nonwoven fabric 2 are cut by a tension cut roll 9 on the downstream side of the cutting roll 8.
The tension is adjusted so that there is no tension imbalance between the two.

On the other hand, a large number of holes (not shown) are dispersedly formed on the surface of the anvil roll 6.
Since the inside of the tube is kept under reduced pressure, the nonwoven fabric product 7 and the remaining nonwoven fabric 2'' passing through the tube are sucked onto the surface of the tube and flow downstream.

When the nonwoven fabric product 7 and the remaining nonwoven fabric 2' sucked by the anvil roll 6 reach the separation nip roll 10 disposed on the downstream side, the nonwoven fabric product 7 is conveyed as is by the anvil roll 6. On the other hand, the remaining nonwoven fabric 2° is covered with guide roll 16 and nip roll 13.1.
3 and is wound up on a winding roll 14.

Nonwoven fabric product 7 conveyed by the anvil roll 6
When it reaches the chute 12, it leaves the anvil roll 6, is delivered via the chute 12 to the conveyor 11 disposed on the downstream side, and is transported to the next process.

Moreover, by replacing the heating roll 4 and the cutting roll 8, nonwoven fabric products 7' and 7' can be obtained in the shapes shown in FIGS. 5(a), (b), and (C).

Claims (2)

[Claims] (1) In a nonwoven fabric cutting method in which continuously supplied strip-shaped nonwoven fabric is cut and punched out as a nonwoven fabric product of a predetermined shape, a portion of a predetermined width including the outline of the nonwoven fabric product is heated and pressed, and then cooled. A method for cutting a nonwoven fabric, comprising cutting the nonwoven fabric according to the predetermined width portion. (2) A nonwoven fabric cutting device that cuts continuously supplied strip-shaped nonwoven fabric and punches it into a nonwoven fabric product of a predetermined shape, including a heating roll that heats and presses a predetermined width portion including the contour shape of the nonwoven fabric product; It is characterized by comprising a cooling roll disposed downstream of the roll to cool the heated nonwoven fabric, and a cutting roll disposed downstream of the cooling roll cutting the nonwoven fabric according to the predetermined width portion. Nonwoven fabric cutting equipment.