JP4025045B2 - Diaper manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a disposable diaper.
[0002]
[Prior art]
Generally, in this type of diaper, the portion covering the crotch of the wearer is narrower than the portion wound around the wearer's torso. In order to form the constricted portion, it is necessary to greatly trim the web of the original fabric.
[0003]
[Problems to be solved by the invention]
Since the trimmed portion is discarded, the material is wasted, resulting in an increase in cost and not preferable from the viewpoint of environmental protection.
[0004]
Therefore, the objective of this invention is providing the manufacturing method of a diaper which can make the waste part in a web as small as possible.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a diaper manufacturing method including a vertically long portion covering a crotch of a wearer and a horizontally long portion having a wing portion projecting to the left and right of the vertically long portion. A step of disposing a plurality of absorbent bodies on a web having one side edge and a second side edge in a state of being separated from each other in the longitudinal direction of the web; and a first in which the first side edge is the laterally long portion. The web is divided into a group and a second group in which the second side edge portion is the horizontally long portion so as to divide the web in the width direction, and each of the first and second groups includes the absorber. And a step of cutting the web so as to be included.
[0006]
In the present invention, generally, a cutting line for cutting the web in the step of cutting the web is represented by a function having a predetermined waveform and wavelength, and adjacent absorbers are alternately arranged in the first group or the second group. The web is carved to belong.
[0007]
Moreover, in this invention, the said 1st and 2nd side edge part is each cut | disconnected along the width direction of the said web, and the said web is cut | disconnected to a longitudinal direction so that it may become the said horizontally long part.
Since the web is generally formed in a T shape by this cutting, the manufactured diaper is also generally T-shaped. However, after cutting the web, another wing portion may be joined to the tip of the vertically long portion so that the final product has a substantially H shape.
[0008]
In the present invention, the step of arranging the absorbent body is superior in productivity when it is divided into two groups, but it may be performed after dividing into two groups or after separating each diaper.
[0009]
In the present invention, in the step of arranging (stacking) the absorbent body, the unitized absorbent body may be placed on the web, but this step is performed by placing a highly absorbent material on the web multiple times. It may be done.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, prior to the description of the manufacturing method, an example of a T-type diaper that can be manufactured by the manufacturing method will be described.
[0011]
In FIG. 1, a T-shaped diaper 1 is formed in a generally T shape by integrating a vertically long portion 2 having a predetermined width and a horizontally long portion 3 wider than the vertically long portion 2. Here, the width W1 of the vertically long portion 2 is generally set to about 450 to 1000 mm for adults and about 250 to 400 mm for children. The length L of the horizontally long portion 3 is generally set to about 900 to 2000 mm for adults and about 500 to 800 mm for children.
[0012]
In the vertically long portion 2, a base portion 2 a that is continuous with the horizontally long portion 3, a crotch portion 2 b that is applied to the wearer's crotch, and a tip portion 2 c that is joined to the horizontally long portion 3 when worn are integrated. On the other hand, wings 3a, 3a projecting to the left and right of the vertically long part 2 are integrally provided at both ends of the horizontally long part 3, and the wing part 3 is wound around the wearer's torso. By joining 3a and 3a to the front-end | tip part 2c of the vertically long part 2, the T-shaped diaper 1 is mounted | worn with a wearer.
[0013]
A first surface fastener F1 is attached to the distal end portion 2c of the vertically long portion 2. On the other hand, both wing portions 3a and 3a of the horizontally long portion 3 can be surface-bonded to the first surface fastener F1. Fastener F2 is attached. One of the hook-and-loop fasteners F1 and F2 may be omitted. In that case, the outermost sheet of the vertically long part 2 or the innermost sheet of the wing part serves as a female surface fastener. Further, instead of the hook-and-loop fastener, an adhesive tape and a portion bonded to the adhesive tape may be provided.
[0014]
The vertically long portion 2 is provided with an absorber C capable of absorbing bodily fluids discharged from the body. In addition, the absorber C may be provided long enough to extend to a part of the region of the horizontally long portion 3. In the horizontally long portion 3, the absorbent body C may be pressed by a sheet.
[0015]
The absorber C may be provided with a plurality of leakage barriers (so-called “cuffs”) 2d that prevent stool and / or urine from exiting the absorber C or the diaper. The leak-proof wall 2d may be bent at least once. For example, the leak-proof wall 2d has a three-dimensional part and a folded part, and the folded part may be bent in the inner direction of the diaper while the wearer wears the diaper. Since such a fold portion tends to be in close contact with the wearer's leg, the effect of preventing leakage is further enhanced. In order to stand the three-dimensional part, it is preferable that an elastic member passes through the three-dimensional part. However, the elastic member does not need to pass through the three-dimensional part for cost reduction. The vertically long portion 2 may be provided with a plurality of leg gathers 2e for preventing stool and / or urine from leaking from the T-shaped diaper. In the T-type diaper 1, it is preferable that the leakage prevention wall 2 d and the leg gather 2 e are provided from the viewpoint of leakage prevention. However, from the viewpoint of reducing air permeability and price, the leakage prevention wall 2 d or the leg gather 2 e is provided. Either of them may be provided.
[0016]
In the horizontally long portion 3, an elastic member 4 serving as a waist gather is introduced to suppress a deviation between the wearer and the T-shaped diaper 1. Furthermore, an elastic member 4 serving as a fit gather for improving the fit of the T-shaped diaper 1 may be introduced into the horizontally long portion 3. The elastic member 4 may be a thread rubber or a flat rubber. Further, the elastic member 4 may be made of urethane, or a web having stretchability may be used for the horizontally long portion 3.
[0017]
Next, an example of a method for manufacturing a T-shaped diaper will be described.
Each process described below is performed while conveying the web in the longitudinal direction (flow direction) of the web.
As shown in FIG. 2, the first and / or second side edge portions 11 and 21 of the web W are folded back, and the elastic member 4 is placed between the folded portions 11a and 21a and the overlapping portions 11b and 21b of the web W. The portions 11a and 21a that are introduced and folded, the portions 11b and 21b of the web W that overlap therewith, and the elastic member 4 are bonded together with an adhesive. Thus, as shown in FIG. 3A, each of the first and / or second side edge portions 11 and 21 is folded and a plurality of the side edge portions 11 and 21 along the longitudinal direction (flow direction) Y of the web W. An elastic member 4 is arranged. As the adhesive, hot melt may be used. The 1st side edge part 11 and the 2nd side edge part 21 may be folded and formed simultaneously, and may be folded and formed in a different process.
[0018]
Thereafter, as shown in FIG. 3B, a large number of absorbent bodies C _i are arranged (laminated) on the surface that is on the inner side when worn on the web W while being separated from each other in the longitudinal direction Y of the web W. The absorbent body C _i is disposed so as to be longer along the width direction X of the web W. At this time, a large number of absorbers C _{1 to} C _n may be arranged so as to be alternately displaced in the width direction X of the web W with respect to the center line CL along the longitudinal direction Y of the web W. .
The absorbent body C _i may be covered with tissue and / or non-woven fabric and further provided with a leak-proof wall. Further, the pitch at which the absorber C _i is provided may be constant or may be changed regularly. 3 to 5, the absorber C _i is drawn with a two-dot chain line so that it can be easily distinguished from other members.
[0019]
When arranging the absorbent body C _i may be laminated on the web W without changing the posture of the absorber C _i, or, using a turn drum 50 shown in FIG. 6, 90 ° turning You may make it laminate | stack on the web W.
In FIG. 6, after the pad 51 sucks and receives the absorbent body C _i on the front roll 48, the turn drum 50 rotates 90 ° to change the posture of the absorbent body C _i. Then, the absorbent body C _i is transferred onto the rear roll 49.
Incidentally, by changing the timing at which the pads 51 of the turn drum 50 adsorbs the absorber C _i, can be arranged by shifting the absorber C _i in the width direction X of the web W in FIG. 3 (b). Also, before passing the absorber C _i to the subsequent roll 49 in FIG. 6, by filling the pitch of the adjacent pads 51 and 51, it is possible to reduce the pitch to arrange the absorber C _i.
[0020]
On the other hand, as shown in FIG. 4, the first and second surface fasteners F <b> 1 and F <b> 2 are arranged (adhered) at predetermined positions on the web W. These hook-and-loop fasteners F1 and F2 may be bonded in advance to the lower surface of the web W before the folding process of FIG. Moreover, the 2nd surface fastener F2 may be arrange | positioned on the surface (surface on which the absorber C is laminated | stacked) on the web W after the said folding process.
As shown in FIG. 5, the second surface fastener F <b> 2 may be cut into two when the adjacent T-shaped diaper 1 is cut and divided into two. Manufacture is easier compared to bonding two pre-cut second surface fasteners F2.
[0021]
As shown in FIG. 4B, the web W is cut into two in the width direction X of the web W along the cutting line 5, and is cut into a first group G1 and a second group G2. This grouping is preferably performed after the folding step and the arrangement of the absorber C and the double-sided fasteners F1 and F2.
As shown in FIG. 5A, in the first group G1, the first side edge portion 11 becomes the horizontally long portion 3. On the other hand, in the second group G2, the second side edge portion 21 is the horizontally long portion 3.
[0022]
As shown in FIG. 4B, in many cases, the adjacent absorbers C _i and C _{i + 1} alternately belong to the first group G1 or the second group G2. The cutting line 5 for separating the first group G1 and the second group G2 described above may be represented by a comb shape, a saw shape, a sine shape, or a periodic function in which these are combined. That is, the cutting line 5 may be represented by a function having a predetermined waveform, an amplitude Af, and a wavelength λ.
[0023]
Figure 5 (a), the following cleavage of the pre-Symbol grouping, by cutting lines 10 and 20 the first and second side edges 11 and 21 along the width direction X, the adjacent T-shaped diaper 1 Disconnected. Thus, the vertically long portions 2 of the T-shaped diapers 1 belonging to and adjacent to the first group G1 sandwich the vertically long portions 2 of the T-shaped diapers 1 belonging to the second group G2. The tip portion 2c of the vertically long portion 2 belonging to the sandwiched second group G2 is adjacent to the wing portion 3a of the horizontally long portion 3 of the first group G1. The wing part 3a is adjacent to the wing part 3a of the same group.
[0024]
Before the absorber C _i is disposed, the elastic member 4 positioned below the absorber C _i may be cut in advance. This is to prevent the absorber C _{i from} contracting due to the contraction of the elastic member 4. In addition, the elastic member 4 does not need to be introduced into the portion where the absorber C _i is disposed.
[0025]
Moreover, before the hook-and-loop fastener F1, F2 is attached, when the elastic member 4 exists in the part to which the hook-and-loop fastener F1, F2 is attached, the elastic member 4 may be cut | disconnected previously. This is to prevent the surface fasteners F1 and F2 from being easily removed due to the contraction of the elastic member 4.
[0026]
In addition, in order to improve the fitting property in the crotch part of the T-shaped diaper 1, as shown in FIG.5 (b), the narrow part may be provided in the vertically long part 2. FIG. The constricted portion is formed by extracting a predetermined portion (a portion indicated by hatching) 2h from the web W. This cutting step may be performed simultaneously with any of the steps described in the present embodiment, or may be performed before and after each step.
[0027]
The web W cut in this way can take two diapers in the width direction of the web W with respect to the width L (length L of the horizontally long portion) of one diaper shown in FIG. Therefore, productivity is high.
[0028]
Instead of the hook-and-loop fasteners F1 and F2, an adhesive tape and a tape for fastening it may be joined. The female side of the hook-and-loop fasteners F1 and F2 may be replaced with a nonwoven fabric.
[0029]
FIG. 7 is a view showing another development example of the T-shaped diaper 1. Differences from the T-shaped diaper 1 in FIG. 5A will be described below.
In FIG. 7, in the T-shaped diaper 1, the absorbent body C is not displaced in the direction crossing the web W. Basically, the elastic member 4 may not be disposed under the absorber C. The elastic member 4 may be sandwiched between the folded webs W as in the case of the T-shaped diaper 1 in FIG. 5A, but may be sandwiched between the first web and the second or third web. Good. For example, it is possible to dispose the elastic member 4 by applying an adhesive to one or the other web, inserting the elastic member 4 between one web and the other web, and niping with a nip roll or the like. is there.
[0030]
FIG. 8 is a development view of the web W showing another cutting state.
As shown in FIG. 8A, the widths W0 and W2 of the vertically long portions 2 of the first group G1 and the width W1 of the vertically long portions 2 of the second group G2 may be different from each other. Further, the widths of the vertically long portions 2 formed in the first group G1 may be different from each other like W0 and W2. Furthermore, the lengths Ll and Ls of the horizontally long portion 3 of the first group G1 and the length Lm of the horizontally long portion 3 of the second group G2 may be different from each other. Further, the lengths of the horizontally long portions 3 formed in the first group G1 may be different from each other like Ll and Ls.
[0031]
By such a shaping method, it becomes possible to simultaneously produce diapers of different sizes. In these cases, four diapers 1 are formed at one wavelength λ of the cutting line 5.
[0032]
Further, as shown in FIG. 8B, the waveform drawn by the cutting line 5 may have different upper and lower amplitudes Afs and Afl from the center line CL. In this case, the height H1 of the horizontally long portion 3 of the first group G1 is different from the height H2 of the horizontally long portion 3 of the second group G2.
In the T-type diaper of the present invention, the elastic member may be disposed in a wave shape from the wing portion 3a under the absorber C, as indicated by a one-dot chain line in FIG. It is for improving the adhesiveness of the absorber C and a wearer. In addition, the elastic member located under the absorber C may be cut in advance as described above.
[0033]
【The invention's effect】
As described above, according to the present invention, the web is divided into the first group in which the first side edge is a horizontally long portion and the second group in which the second side edge is a horizontally long portion. Since it can be divided into shapes, the area of trimming can be reduced to zero or as small as possible. Therefore, the waste part in the web can be made as small as possible.
Moreover, since a pair of products can be taken in the width direction of the web with respect to the length of one horizontally long portion, the production speed can be improved.
Furthermore, the width direction of the diaper obtained corresponds to the longitudinal direction of the web. Therefore, when a caregiver wears a diaper on an adult wearer lying down sideways, a large external force is easily applied in the width direction of the diaper, whereas the diaper is less likely to break in the width direction.
[0034]
Further, if the cutting line that divides the web into two groups is represented by a function having a predetermined amplitude and wavelength, automatic control of the apparatus is facilitated and the web can be continuously cut.
[0035]
Moreover, if an absorber is arrange | positioned with the position shifted alternately with respect to the centerline of a web in the width direction of a web, an absorber can be provided in a suitable position.
[0036]
Note that productivity is improved by arranging the absorber before the grouping step.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a T-shaped diaper according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a process of placing an elastic member on a web according to an embodiment of the manufacturing method of the present invention.
FIG. 3A is a plan view showing a web with side edges folded, and FIG. 3B is a plan view showing the web in a state where absorbent bodies are laminated.
FIG. 4A is a plan view of a web showing a state in which surface fasteners are joined, and FIG. 4B is a plan view of the web showing a state of being divided into a first group and a second group.
5A is a developed view of a web showing a state cut into a T-shaped diaper, and FIG. 5B is a developed view of the web showing a state after trimming.
FIG. 6 is a conceptual diagram showing an apparatus for changing the posture and pitch of an absorber.
FIG. 7 is a development view of a web including T-shaped diapers having other shapes and structures.
FIG. 8 is a developed view of the web showing another cutting state.
[Explanation of symbols]
1: T-shaped diaper 2: Vertically long portion 3: Horizontally long portion 3a: Wing 11: First side edge 21: Second side edge C: Absorbent body G1: First group G2: Second group W: Web X: Width direction Y: Longitudinal direction

Claims (7)

A method for producing a diaper comprising a vertically long portion covering a crotch of a wearer and a horizontally long portion having a wing portion protruding to the left and right of the vertically long portion,
Arranging a plurality of absorbent bodies in a state of being separated from each other in the longitudinal direction of the web on a web having a first side edge and a second side edge;
The web is connected to the first group which is continuous in the longitudinal direction and the first side edge is the laterally long part, and the second group which is continuous in the longitudinal direction and the second side edge is the laterally long part. with isolate so as to divide the width direction, wherein the first and second group, respectively, and a step to isolate the web to include the absorbent body,
A step of cutting the first and second side edges along the width direction of the web and cutting the web into individual diapers so as to become the horizontally long portions after the two groups are cut. How to make diapers. In claim 1,
The cutting line for cutting the web in the step of cutting the web is represented by a function having a predetermined waveform and wavelength, and the webs are arranged so that adjacent absorbers alternately belong to the first group or the second group. A manufacturing method for diapers that can be cut. In claim 1 or 2 ,
The method of manufacturing a diaper, wherein in the step of dividing into two groups, the vertically long part of one group is cut so as to sandwich the vertically long part of the other group. In claim 1, 2 or 3 ,
The method of manufacturing a diaper, wherein in the step of dividing into the two groups, the portion that becomes the wing portion is cut so as to face the tip portion of the vertically long portion. In any one of Claims 1 thru | or 4 ,
Before cutting each side edge part along the width direction of the web, respectively, a step of arranging a plurality of elastic members along the longitudinal direction of the web on the first and second side edges, respectively. A diaper manufacturing method further provided. In any one of Claims 1 thru | or 5 ,
The method for producing a diaper, wherein in the step of disposing the absorbent body, the absorbent body is disposed in a state of being alternately displaced in a width direction of the web with respect to a center line along the longitudinal direction of the web. In any one of Claims 1 thru | or 6 ,
A method for producing a diaper, wherein at least the vertically long portion has a leak-proof wall.

Images