JPH0767476B2 - Arrangement method of elastic stretch lines in worn articles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for arranging elastic stretchable wires in a wearing article, and more specifically, an article to be worn on the body such as a disposable diaper and a disposable diaper cover, The present invention relates to a method of arranging an elastic expansion / contraction line that elastically presses around the leg.

(Prior Art) Conventionally, for example, a disposable diaper is known in which a side flap on the opposite side thereof is provided with an elastic member for leg rotation. The elastic members of this type of diaper generally used for practical use are arranged in parallel on the opposite side. However, from the viewpoint of the fit of the diaper to the body, it is desirable that the opposing elastic members are arranged so as to fit and closely contact the wearer's body. Therefore, for example, a diaper is known in which the front crotch part of the diaper is narrow and is formed so as to widen toward the buttocks. In addition, the side flap with the elastic member attached is folded back inward, and its longitudinal central portion is joined to the upper surface of the top sheet in the region where the absorbent core is located, so that when worn, it spreads from the joined portion toward the front and back sides. The so-called turn-up type formed in the above is used for practical use.

(Problems to be Solved by the Invention) However, in this type of diaper to be mass-produced at low cost, it is difficult to change the distance between the opposing elastic members from the manufacturing process. In this manufacturing process, the diaper constituent members and elastic members are continuously supplied in the manufacturing line direction, and the latter is bonded to the former via an adhesive, so that they are continuously supplied. Because it is difficult to change the moving direction of the elastic member for each unit area of each diaper,
Even if you dare to overcome that difficulty, it is not satisfactory in terms of high-speed production, and problems often occur. Therefore, this is the reason why the elastic members of the conventional diaper are generally arranged in parallel as described above.

Also, the turn-up diaper is relatively easy to manufacture, but the fit is still insufficient.

An object of the present invention is to provide a method capable of selectively arranging the intervals of the elastic members in the wearing article and elastic stretch lines by them.

(Means for Solving the Problems) The present invention is to wear a side flap on the opposite side, and an elastic member for forming an elastic stretch line elastically in pressure contact with the wearer's leg surroundings on the side flap. A method of arranging elastic stretchable lines in an article, wherein the side flap is formed of a first portion and a second portion to which the elastic member is attached, and the second portion is superposed on the first portion. At least two longitudinally extending inner and outer seals that are not connected to each other are arranged on the first and second portions on the outer side of the elastic expansion and contraction line of the second portion with these seal lines as base ends. Forming a free end having a space between the inner edge of the second portion and the outer seal line and its imaginary extension line without the inner seal line. end It is an object of the present invention to provide the above-mentioned method capable of solving the above-mentioned problems by forming the elastic expansion / contraction line by the elastic member on at least a part of the portion.

(Example) An example of the present invention (a diaper is taken as an example) will be described with reference to the drawings as follows.

1 to 3, the absorbent core 3 is interposed between the water-permeable topsheet 1 and the water-impermeable backsheet 2, and the two sheet portions extending outward from the opposite side edges of the core 3 are used. The elastic members 5 that form elastic elasticity in the longitudinal direction of the formed side flaps 4 are arranged in parallel with each other. In this case, the top sheet 1, the back sheet 2, and the core 3 are bonded to each other with a hot-melt type adhesive, and the sheet portions forming the side flaps 4 and the elastic member 5 are also bonded with the adhesive. The opposing side flaps 4 are folded back inward to form a first portion 4a on the lower side and a second portion 4b on the upper side, and are arranged outside the elastic member 5 located at the inner edge of the second portion 4b, By joining the second portions 4a and 4b with inner and outer seal lines 6a and 6b extending in the longitudinal direction of the diaper, a free end having these seal lines as a base end is formed. The inner seal line 6a is relatively short and located approximately in the front half of the front area, and the outer seal line 6b is
It is relatively long and extends from the rear end of the inner seal line 6a to the rear end of the rear region. The seal lines 6a and 6b are, in the figure,
In order to clearly show these on the upper surface of the side flap 4, the cross-section is exaggerated in a V-groove shape, but not only when sealing with an adhesive, but also when thermocompression bonding is performed,
It is added that such a situation does not occur.

The diaper thus formed has a symmetrical structure in the left and right side regions with the virtual horizontal center line 7 as a boundary, and has the front and rear regions with the virtual vertical center line 8 as a boundary.

As shown in FIG. 2, in the diaper formed in this way and sealed with the inner and outer seal lines 6a and 6b as shown in FIG. 1, the elastic member 5 is contracted to some extent. In the state, due to its contracting action, the free end of the second portion 4b is
4c stands up along the seal lines 6a and 6b. Also,
In such a standing state, the interval between the opposite free ends 4c is narrow in almost the front half of the front area and wide in the front area from the front half.

FIG. 4 shows an example in which the second portion 4b is formed separately from the first portion 4a, overlapped with the first portion 4a, and these are sealed by inner and outer seal lines 6a and 6b. However, in the present invention,
This may be done, or as shown in FIG. 3, a part of the side flap 4 may be folded to form the second portion 4b.

In the following description of FIGS. 5-12,
Reference will only be made to the side flaps 4 in the right-hand area of the diaper shown in FIG. 1 and omitted in the left-hand area. When referring to the seal lines 6a, 6b, ..., It means the seal lines that extend in the longitudinal direction of the first portion 4a and the second portion 4b constituting the side flap 4 and join them.
5-1 to 5-6, 8-1 and 8
-2, 9-1 and 9-2 in each embodiment, the free end 4c of the second portion 4b is erected along the seal lines 6a, 6b ... When referring to the configuration in which the upper edge portion is viewed from a plane, it means that the elastic member 5 located at the free end portion 4c is in a contracted state to some extent as described above with reference to FIG. To do. In the description of the form in which the upper edge of the free end 4c is viewed from a plane, in each figure showing the form, the portion in which the free end 4c is indicated by a double line and its vicinity stand upright substantially vertically and form a single layer. The part indicated by the line inclines outward from the end of the part indicated by the double line and the vicinity thereof toward the front end part and / or the rear end part, and is completely inclined outward at the front and rear end parts. Indicates that there is. When the front end portion and the rear end portion of the second portion 4b are referred to, they mean the portions corresponding to the portion 4d shown in FIG.

Now, in FIG. 5, the interval between the free ends 4c facing each other in the left and right side areas of the diaper (see FIG. 1) is narrow in almost the front half of the front area and wide in the front area from the front half. The basic mode of the seal line in the side flap 4 for the purpose of showing is shown. In this embodiment, the front half of the front section of the side flap 4 is provided with a relatively short inner seal line 6a, and the front half to the rear section is provided with a relatively long outer seal line 6b. The free end portion 4c formed by sealing in this manner has sealing lines 6a and 6b.
Standing upwards along and looking at the upper edge of the free end 4c from a plan view, it has substantially the bent shape shown in FIG. 5-1.

In the embodiment shown in Fig. 5-1, the front and rear end portions of the free end portion 4c are folded back to the outside (on the right side in the drawing, the same applies hereinafter) and fixed,
Moreover, when the upper edge of the free end 4c is seen from a plane, it has a curved shape (see FIG. 2) substantially as shown in FIG. 5-2. When only the rear end portion is folded back and fixed and the upper edge portion is viewed from a plane, it has a curved shape substantially as shown in FIG. 5-3. While folding the front end inward (left side in the figure, the same hereafter),
When the rear end portions are folded back outwardly and fixed, respectively, and when the upper edge portion is viewed from a plane, this is substantially the 5th-4th.
It becomes a curved shape as shown in the figure.

In the embodiment shown in FIG. 5-5, the second portion is provided at the front end.
Double-width 2l of width l ₁ from the inner edge of 4b to the inner sealing line 6a ₁
Is a fixed width by folding back, and at the rear end, the second portion 4b
Of from the inner edge as fixed width folded double-width 2l ₂ of width l ₂ until the outer seal line 6b. However, in FIG. 5-6, at the front end, the inner seal line is drawn from the inner edge of the second portion 4b.
1.5 times the width l ₁ up to 6a The width 1.5l ₁ is folded back to be the fixed width, and at the rear end, from the inner edge of the second portion 4b to the outer seal line.
By setting the width 1.5l ₂ which is 1.5 times the width l ₂ up to 6b to be the folded fixed width, the bending angle of the free end portion 4c in the embodiment shown in Fig. 5-6 is smaller than that in the embodiment shown in Fig. 5-5. Is also shown.

In the embodiment shown in FIG. 6, the outer seal line 6b in the embodiment shown in FIG. 5 is extended to the front end of the front section and is continuous over the entire length of the front and rear sections. In the mode shown in FIG. 7, in addition to the seal lines 6a and 6b in the mode shown in FIG. 5, the outermost seal line 6c continuous over the front and rear regions.
Has been applied. The reason why the seal lines 6b and 6c are continuous in this way is that, as already described with respect to the embodiment shown in FIG.
If the second portion 4b is formed separately from the first portion 4a and is overlapped with the first portion 4a, and the joining state of the outer portions of the seal lines is not necessarily watertight, the seal lines are not applied. The body fluid absorbed in the core 3 is the first portion 4a.
This is to prevent leakage to the outside through the overlapping surface of the second portion 4b and the second portion 4b.

In FIG. 8, in the side flaps 4 for narrowing the interval between the free end portions 4c facing each other in the left and right side areas of the diaper in the central area with the virtual horizontal center line 8 as the boundary and widening in the front and rear areas. The basic form of the seal line is shown. In this embodiment, a relatively short inner seal line 6a is provided with the virtual lateral center line 8 as a boundary, and two relatively long outer seal lines 6b are provided in the front and rear regions. The free end portion 4c formed by sealing in this way stands up along the seal lines 6a and 6b, and the free end portion 4c
When viewed from above, the upper edge of the
As shown in the figure, it is curved. In the embodiment shown in FIG. 8-1, when the front and rear ends of the free end 4c are folded back and fixed to the outside and the upper edge of the free end 4c is viewed from a plane, this is substantially It becomes a curved shape as shown in Fig. 2.

FIG. 9 shows a mode in which the mode shown in FIG. 8 is slightly modified. In this embodiment, a relatively short inner seal line 6a and a relatively long outer seal line 6b are provided in the rear region and the longest outermost seal line 6c is provided in the front region. Free end 4c formed by sealing in this way
Stands substantially vertically along the seal lines 6a, 6b, 6c,
Moreover, when the upper edge of the free end 4c is viewed from a plane, it has a substantially curved shape as shown in FIG. 9-1.

In the embodiment shown in FIG. 9-1, when the front and rear ends of the free end 4c are folded back and fixed to the outside, and when the upper edge of the free end 4c is viewed from a plane, this is substantially 9- It becomes a curved shape as shown in Fig. 2.

In the embodiment shown in FIG. 10, the two outer seal lines 6b in the embodiment shown in FIG. 8 are continuous. In the embodiment shown in FIG. 11, the seal lines 6a, 6 in the embodiment shown in FIG.
In addition to b, the outermost seal line 6c is provided continuously over the front and rear areas. In the embodiment shown in FIG. 12, in addition to the seal lines 6a, 6b and the outermost seal line 6c in the embodiment shown in FIG.
Has been applied. The reason why the continuous seal lines 6a, 6b, 6c, 6d are arranged over the front and rear regions is the same as the reason already described with reference to FIGS. 6 and 7.

As can be understood from the above-described aspects, in the present invention, the first portion 4a and the second portion which constitute the side flap 4 are formed.
In a region which requires at least inner and outer seal lines 6a, 6b for joining with 4b, and in which the seal line 6a does not intervene between the inner edge of the second portion 4b and the outer seal line 6b and its virtual extension line, The distance between the outer edge of the core 3 and the free end 4c is wide. Also, at least the inner and outer seal lines 6a, 6
By b, at least a part of the elastic expansion / contraction line can be formed on the free end 4c under the action of the elastic member 5. Moreover, at least the length and interval of the inner and outer seal lines 6a and 6b, and whether or not the free end portion 4c is folded back and fixed to the inside and the outside of the elastic expansion and contraction line is bent or curved.
It can be determined by appropriately selecting conditions such as a combination of folding back to the inside / outside and fixing the folded portion in whole / partially (FIGS. 5-5 and 5-6).

Outside the outer seal lines 6b in FIGS. 5, 6, 8 and 10 and the outermost seal lines 6c, 6d in FIGS. 7, 9, 11 and 12. In the area, multiple seal lines (including long and short or a combination of them)
It may also be joined by a wide band seal. Such joining is performed by connecting the second portion 4b to the first portion as shown in FIG.
It is particularly preferable when it is formed separately from 4a and stacked on it. Further, the seal lines 6a, 6b, ... May be provided in chain lines (discontinuous) as long as they fulfill the above-mentioned function. When the topsheet 1, the backsheet 2, and the core 3 can be made of the conventionally known materials for disposable diapers, and the second portion 4b is formed separately from the first portion 4a. As the material of the second portion 4b, it is preferable to use a material having excellent ventilation and waterproof properties.

(Advantages of the Invention) As described above, the present invention overlaps the side flaps so that the side flaps become the first portion and the second portion, and selectively applies the seal line on the first portion and the second portion. Since the free end portion having the elastic member is formed by means of at least one of the free end portions in a state where the free end portion is erected or is expanded outward even if both opposing elastic members are attached in parallel. An elastic expansion / contraction line formed by the elastic member is formed on the portion along the seal line. Therefore, in the production of a diaper, it is not necessary to dare to adopt the difficult special means and method having the above-mentioned problems, since the opposing elastic members are arranged so as to be able to fit and adhere to the wearer's body. Ordinary means and method for arranging the intervals of the elastic members in parallel can be adopted, which is suitable for high-speed production and causes few troubles.

[Brief description of drawings]

FIG. 1 is a developed plan view of a diaper according to an embodiment of the present invention,
FIG. 2 is a perspective view of the diaper in a state where the elastic member is contracted to some extent, and FIGS. 3 and 4 are FIG. 1 III-I.
Sectional view taken along line II, 5, 6, 6 and 8
FIG. 9, FIG. 10, FIG. 10 to FIG. 12 are plan views of respective arrangements of seal lines in the side flaps, FIG. 5-1 to FIG. 5-6, FIG. 8-1 and FIG. 8-2. 9-1 and 9-2 are plan views of a bent or curved form of the free end of the side flap formed by the seal line. 4 …… Side flap 4a …… First part 4b …… Second part 6a, 6b, 6c, 6d …… Seal wire

Claims (7)

[Claims] 1. A method of arranging elastic stretch lines in a wearing article, comprising side flaps on opposite sides and elastic members forming elastic stretch lines elastically pressed against the legs of a wearer on the side flaps. The side flap is formed from a first portion and a second portion to which the elastic member is attached, and the second portion is superposed on the first portion, and the first and second portions outside the elastic member are formed. And at least two longitudinally extending inner and outer seal lines that are not connected to each other are arranged to form a free end having the elastic member of the second portion with the seal lines as a base end. , The arrangement is such that there is a region between the inner edge of the second portion and the outer seal line and its imaginary extension that does not interpose the inner seal line, at least the free end. Said method characterized by forming said to form said elastic stretchable line by the elastic member to the section. 2. A region in which the inner seal line is not interposed between the inner edge of the second portion and the outer seal line and a virtual extension thereof is located at least in a rear region of the side trap. The method according to claim 1. 3. An area in which the inner seal line is not interposed between an inner edge of the second portion and the outer seal line and a virtual extension thereof is located in front and rear areas of the side flap. The method according to claim 1. 4. The method according to claim 1, wherein the rear end of the free end is folded back and fixed to the outside. 5. The method according to claim 1, wherein the front end of the free end is folded back and fixed to the outside. 6. The method according to claim 1, wherein the front and rear ends of the free end are folded back outward and fixed. 7. The method according to claim 1, wherein the front end of the free end is folded back inside and the rear end is folded back outside.