JPS6129349A - Formation of absorber of sanitary article - 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 (Field of Industrial Application) The present invention relates to sanitary articles such as disposable diapers and incontinence pads, and particularly to methods for forming absorbent bodies thereof.

(Prior Art) Conventionally, in disposable diapers, an absorbent body is formed into a so-called hourglass shape in order to achieve a fit and close fit to the body, and the central region of the absorbent body is formed in a thick shape in order to increase the body fluid absorption capacity of the absorbent body. It is known that the absorbent body is formed in layers, and the rear region of the absorbent body where the wearer's hips are located has a wider rear region in order to increase the body fluid absorption capacity in the absorber.

Generally, in order to form an absorbent body into an hourglass shape, opposing side edges in the crotch area of the absorbent body are cut off, or the opposite side edges are folded back. Furthermore, in order to form a thick layer in the center region of the absorbent body, a method has been adopted in which narrow and wide absorbent bodies are formed separately and then stacked on top of each other.

(Problems to be Solved by the Invention) In the conventional method for forming an absorbent body of a diaper as described above, cutting off the opposite side ends of the crotch area of the absorbent body is not preferable in terms of the material economy of the absorbent body. In the case where the opposing side ends are folded back, it is difficult to form the side end shape in the inseam area so that it closely fits around the wearer's chest, and it is difficult to form the side end shape in the crotch area so that it closely fits around the wearer's chest. Products that overlap these materials have drawbacks such as poor workability.

(Means for Solving the Problems) An object of the present invention is to provide a method for forming an absorbent body that can effectively solve the above problems.

The present invention will be described below based on illustrated examples.

FIG. 1 shows a continuous web that is a constituent material of the absorbent body of the present invention. The continuous web 1 is made of, for example, a water-absorbent material that has conventionally been generally used as an absorbent material for absorbent sanitary articles such as disposable diapers.

It is formed from pulverized pulp and a mixture of this and superabsorbent polymer powder. On one or both sides of the continuous web 1,
An extremely thin water-permeable sheet is sometimes used to serve as a carrier sheet for the pulverized pulp when forming the absorbent material, or to maintain the shape of the absorbent material during its formation or use as a diaper.

The continuous web 1 has first and second side edges 2a and 2b that face each other in parallel, and is cut so that a continuous periodic waveform curve 3 is generated in the length direction between these side edges. , first and second continuous webs 4a.

Form 4b. First and second continuous webs 4a, 4b
is from the apex 6 of the peak 5 of those curves 3 to the NTh position 7
The first and second unit webs 8a are cut in the width direction at
Form 8b. Since the pair of unit webs 8a and 8b constitute the absorbent body of one diaper, as shown in FIG. 2, the peaks 5 of their curves 3 are located symmetrically, and
The first and second side edges 2a, 2 are located between the peaks 6 of the peaks 5.
Lay them one on top of the other so that they are parallel and facing each other. This overlapping width W is appropriately determined in consideration of the shape and size of the absorbent body to be formed, the curvature of the curve 4, and the like.

In the above aspect of the present invention, the pair of unit webs 8a
, 8b, and then stacked on top of each other.
In the figure, a pair of continuous webs 4a.

4b and then combine them into a pair of unit webs Jla
.

8b is shown, and these two layers are the same in terms of the gist of the present invention. That is, as shown in FIG. 3, first and second continuous webs 4a, 4b
The peaks 5 of those curves 3 are located symmetrically, and the first and second side ends 2a are located between the peaks 6 of those peaks 5.
, 2b are placed on top of each other so that they are positioned facing each other. and,
The first and second continuous webs 4a, 4b are cut in the width direction at a position 7 offset from the apex 6 of the peak 5, and the first and second continuous webs 4a, 4b are
and form second unit webs 8a, 8b. In order to overlap the pair of continuous webs 4a, 4b, it is necessary to shift one of them in the length direction, but when the absorbent body is continuously produced mechanically, it is difficult for those skilled in the art to do this. It would be easy to do so.

(Example) As shown in Figure 4, size 350mm x 450+
w+o, weight 30 g/rrr, a nonwoven fabric made by entangling a mixture of 50% by weight of polyester fibers and 50% by weight of rayon fibers by high-speed water treatment] 1 and a polyethylene film 12 with a thickness of 25μ, an absorber 10 is placed between The nonwoven fabric 11 and the film 12 interposed and extending from the outside of the absorbent body 10 were joined by hot melt, and the pressure sensitive adhesive tape 13 on the back side of both rear ends was attached to create a diaper 14.

The absorbent body 10 is a mixture of pulverized pulp and superabsorbent polymer powder at a weight of 225 g/rrr (8% by weight of polymer).
A continuous web having a width of 290M was prepared using the above method, and this was processed by the method described above (see FIGS. 1 and 2). The height of the top of the peak and the depth of the valley of the cutting waveform curve in the continuous web is 120 degrees, and the length of a pair of unit webs for one diaper obtained by cutting the continuous web is 360 + a +
++, and the overlapping width of the pair of unit webs is 100wn
And so.

(action, effect) According to the present invention, the structure is formed as described above.

The method for forming the absorbent body is relatively simple and suitable for high-speed production of diapers, and the equipment for carrying out the method is also extremely simple, making it possible to mass-produce diapers at low cost. By appropriately selecting the period and curvature of the waveform curve that cuts the continuous web into the left half continuous web and the right half continuous web, there is an advantage that it becomes possible to form an absorbent body that conforms to and closely fits the body.

[Brief explanation of the drawing]

The drawings show an embodiment of the method of the present invention, and FIG. 1 is a partial plan view of a continuous web formed as a constituent material of a diaper absorbent body and cut into wavy curves, and FIG. A plan view of the web cut into unit webs for one diaper and stacked together to form an absorbent body for the diaper; FIG. 3 is a partial plan view of the cut continuous webs of FIG. 1 stacked together;
FIG. 4 is a partially cutaway plan view of a completed diaper in which the absorbent body formed by the method of the present invention is combined with other constituent members of the diaper. 1... Continuous web 2a... First side end 2b.
...Second side edge 3...Cutting curve 4th...First continuous web 4b...Second continuous web 5...Mountain 6...Apex Point 7...Width direction cutting line 8a... ...First unit web 8b...Second unit web W...Overlap width 15th! ! 1 4a 4b Fig. 2 Fig. 3

Claims (8)

[Claims] (1) forming a continuous web having opposing first and second side edges of a water-absorbing material, such that a periodic waveform curve that is continuous in the length direction is generated between the first and second side edges; cutting the continuous web to form first and second continuous webs; cutting the first and second continuous webs in the width direction at positions offset from the peaks of the curves of the first and second continuous webs; and forming a second unit web, wherein the peaks of the first and second unit webs are symmetrically located, and the first and second side ends of the webs are located between the peaks of the peaks of the webs. A method for forming an absorbent body for a sanitary article, comprising: superimposing the webs so as to face each other. (2) The method for forming an absorbent body for sanitary articles according to claim 1, wherein the water-absorbing material is mainly composed of pulverized pulp. (3) The method for forming an absorbent body for a sanitary article according to claim 1, wherein the water-absorbing material is mainly a mixture of pulverized pulp and superabsorbent polymer powder. (4) The method for forming an absorbent body for a sanitary article according to claim 1, wherein at least one side of the web is coated with a water-permeable sheet. (5) forming a continuous web having opposing first and second side edges of a water-absorbing material, such that a periodic waveform curve that is continuous in the length direction is generated between the first and second side edges; cutting the continuous web to form first and second continuous webs, wherein the curved peaks of the first and second continuous webs are symmetrically located, and between the peaks of the peaks of the webs; overlapping the webs so that the first and second side edges of the webs are located opposite; cutting the webs in the width direction at positions offset from the peaks of the crests of the first and second continuous webs; A method for forming an absorbent body for a sanitary article, comprising: forming the first and second unit webs in the overlapping state. (6) The method for forming an absorbent body for sanitary articles according to claim 5, wherein the water-absorbing material is mainly composed of pulverized pulp. (7) The method for forming an absorbent body for sanitary articles according to claim 5, wherein the water-absorbing material is mainly composed of a mixture of pulverized pulp and superabsorbent polymer powder. (8) The method for forming an absorbent body for sanitary articles according to claim 5, wherein at least one side of the web is coated with a water-permeable sheet.