JP2532824B2 - Disposable brief manufacturing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing apparatus for disposable briefs, and more particularly to a manufacturing apparatus for pants-type diapers and training pants for infants.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for manufacturing a brief of this type, there are those disclosed in JP-A-57-77304 and JP-A-57-117602. These techniques disclose devices for attaching elastic members to the leg holes of briefs.

It may be preferable to use a plurality of elastic members in order to obtain the required tightening around the leg holes of the leg holes, but the above-mentioned prior art teaches no means for processing the elastic members in such a case. Absent.

Further, among the above-mentioned conventional techniques, Japanese Patent Laid-Open No. 57-57
Japanese Laid-Open Patent Publication No. 117602 discloses two moving bodies which hold a continuous elastic member (rubber string) for leg holes and are arranged on a continuous web. However, both moving bodies have a mechanism of moving along a bearing device which is one orbit extending in a lateral direction orthogonal to the transfer direction of the continuous web. Therefore, in order to seal the elastic cords, which are respectively held by the movable bodies and draw a required curve, continuously around the leg of the wearer as needed, for example, the elastic cords are attached so as to be in contact with each other or cross each other. Can't make a brief.

It is an object of the present invention to provide a device capable of performing displacement bending of a plurality of elastic yarns at high speed and continuously, as elastic members for leg holes, and attaching the elastic yarns to a moving web, and thus mass production at high speed. It is in.

[0006]

According to the present invention for achieving the above object, the elastic members of both leg holes are composed of a first elastic member and a second elastic member, and the first elastic member and the second elastic member are respectively central portions. And the both side portions are curved in a substantially U shape, and the center portions of the first and second elastic members are made to cross between the both leg holes, and the both side portions of the first elastic member are A manufacturing apparatus for a disposable brief, wherein the both side portions of the second elastic member are respectively positioned along substantially the front halves of both leg holes and along the remaining second half of the remaining leg holes, respectively. It is characterized by including the following means.

A) Having a plurality of first yarn guide holding portions which are spaced apart from each other and arranged side by side, and which moves forward and backward so as to intersect with the moving direction on a substantially half region in the width direction of the substantially central region of the moving continuous web, A first continuous elastic member made of each elastic yarn in an extended state held in each of the first yarn guide holding portions is drawn on the continuous web at a constant cycle so as to draw a sine curve curve in a direction intersecting the moving direction. A first traverse means for displacing and bending.

B) A plurality of second yarn guide holding portions which are arranged in parallel with the first traverse means and are spaced apart from each other and juxtaposed with each other, and in the moving direction on the other half of the approximately central region. A first continuous elastic member made of elastic yarns held in each of the second yarn guide holding portions and extending in a direction intersecting the moving direction on the continuous web. (1) A second traverse means for displacing and curving a sine-curve curve of the continuous elastic member and sine-curve curves that are opposed to each other in the width direction of the continuous web so as to draw a sine-curve curve.

C) Means for fixing the first and second continuous elastic members in the displacement curved state by pressing them on the continuous web via an adhesive.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an assembled perspective view of a disposable brief manufactured by the device of the present invention. The brief 1 includes a waist hole 2, a pair of leg holes 3, and elastic members 4 and 5 which are mounted along the circumference of the waist hole 2 to form a stretchable gather.

FIG. 2 shows an exploded perspective view of the brief 1. The brief 1 includes a top sheet 6 and a back sheet 7 each formed of a fibrous nonwoven fabric that can be stretched in the vertical and horizontal directions.
And a mat-shaped absorbent core 8 interposed therebetween,
It is composed of the elastic members 4 and 5. Top sheet 6
Also, the back sheet 7 has recessed portions 13a and 13b on both sides.
have. The core 8 also has recessed portions 10 on both sides, and has a so-called hourglass shape. The core 8 is formed mainly of fluff pulp. The elastic member 4 is attached between the waist portions 11 and 12 of the top sheet 6 and the back sheet 7 via a later-described adhesive so as to be stretchable in the lateral direction thereof.

The elastic member 5 includes the first and second elastic members 5.
It is composed of A and 5B. Each of the first and second elastic members 5A and 5B is composed of a plurality of elastic threads,
It has a central portion 5a and both side portions 5b, and is curved upward, that is, in a substantially U-shape facing the waist hole 3. In the first and second elastic members 5A and 5B, the elastic yarns in the respective rows are separated from each other in parallel without intersecting each other. First and second elastic members 5A, 5B
The central portions 5a cross the crotch region of the pants 1 in parallel with each other, the side portions 5b of the first elastic member 5A extend substantially along the front halves of both leg holes 3, and the side portion 5 of the second elastic member 5B.
b is located along substantially the rear half of both leg holes 3, and only the both sides 5b thereof are the top seat 6 and the back seat 7.
It is fixed between and.

FIG. 3 shows a schematic view of an apparatus for manufacturing the brief 1. The continuous web 27, which is the material of the back sheet 7, is formed by a roller 102 via a group of guide rollers 100 and a tension roller 101 in the width direction with respect to the web.
It is guided to the adhesive application section 102 including a, 102b, and 102c. In the coating section 102, as shown in FIG. 4 (A), a hot-melt adhesive is applied to the central region of the web 27 at predetermined intervals in the lengthwise direction of the web 27 to form an elliptical shape slightly longer in the widthwise direction of the web 27. Adhesive area 30a is provided. Further, the web 27 is guided to the rotary drum 106 in the assembly station 105 via the widthwise tensioning roller 103 and the pinching roller 104 for the web 27.
On the other hand, the continuous elastic members 25A and 25B, which are the materials of the elastic members 5A and 5B and are made of three elastic threads, respectively,
It is guided to the traverse means 108, 109 while being stretched to a required ratio by the tension roller 107.

6 and 7, the traverse means 10 is shown.
The schematic perspective view and sectional drawing of the mechanism of 8 and 109 are shown. The traverse means 108 and 109 respectively include support cylinders 110 and 111 facing the pressure roller 104 in parallel therewith, slide rods 112 and 113 inserted into the support cylinders, and the slide rods. A support piece 114 fixed to the tip of the
It includes guide rods 116 and 117 which are vertically provided at 115. The sliding rods 112 and 113 are controlled by a cam mechanism (not shown) linked to their base ends. The guide rods 116 and 117 have thread guide holding portions 118a and 119a formed of three short tubes arranged in parallel in the transverse direction intersecting the longitudinal axis of the web 27 at right angles to the bent portions 118 and 119 at the lower ends. Have. The directions (angles) of the yarn guide holding portions 118a, 119a with respect to the longitudinal axis of the web 27 are elastic members 25A, 25 bonded to the web 27.
This is important for maintaining the separation and parallel arrangement of the respective elastic yarns of B, and the one shown in the drawing is a preferred example, and the separation and parallel state of the respective elastic yarns with respect to the web 27 can be changed by the angle. Each of the elastic threads of the elastic members 25A and 25B is inserted into each of the thread guide holding portions 118a and 119a. The lower ends of the yarn guide holding portions 118a and 119a face the surface of the pressure roller 104 in close proximity. Sliding rod 11
The cam mechanisms 2 and 113 are controlled so as to move by a distance between the solid line position and the chain line position of the guide rods 116 and 117 shown in FIG. The movement of the sliding rods 112, 113 under this control, that is, the guide rods 116, 1
The elastic members 25A, 25B, which are inserted by the yarn guide holding portions 118a, 119a by the movement of 17, and in which the elastic yarns are arranged narrower than the application width of the adhesive forming the adhesive region 30a.
However, as shown in FIG. 4 (B), the width of the web 27, which is provided with the adhesive zone 30a, extends along the substantially half circumference of the adhesive zone of the web 27 and intersects between the adjacent adhesive zones. Sine curve-shaped curves facing each other in the direction, that is, so as to draw the curves with curved peaks and peaks or valleys and valleys facing each other, and the elastic threads of the elastic members 25A and 25B. Are arranged so that they do not fold over or cross each other.

The web 27 of the sliding rods 112 and 113 is also used.
The stroke distance across the thread or the thread guide holder 118
Depending on the amount of movement of the a and 119a across the web 27, the positions of their operating start and end points, the speed of the sliding rods 112 and 113 and the web 27, the parallel spacing of the elastic yarns in the web 27 may be, for example, It is set such that the interval between the later-described portions 25a that gradually increase from the start end position to the end position or that are in parallel with each other increases or decreases.

FIG. 8 shows the sliding rod 112 and the guide rod 116.
Sectional view of a mechanism for controlling the movement of the elastic member 25A to deform a part of a sine curve-shaped curve drawn by the elastic member 25A,
FIG. 9 shows a plan view of the deformed state. In the vicinity of the front end of the support cylinder 110 shown in FIG. 6, the regulating rods 120 and 121 are inserted and fixed at a distance in the lengthwise direction of the sliding rod 112. Sliding rail 12 installed between pieces 120 and 121
A support piece 114 for supporting the guide rod 116 is slidably inserted into and supported by the guide rod 116, and a coil spring 123 is interposed between the support piece 114 and the restriction piece 120. A stopper 125 is provided which abuts the side surface of the support piece 114 from the immovable portion 124 at a predetermined position. If such a mechanism is not attached to the sliding rod 112, the sliding rod 112
And the movement of the guide rod 116 causes the elastic member 25A to be arranged so as to draw a sine curve-shaped curve having an arcuate portion 25A '. In the case where such a mechanism is attached to the sliding rod 112 as shown in FIG. When the support piece 114 supporting the guide rod 116 abuts against the stopper 125, the sinusoidal curve of the elastic member 25A is deformed into the straight line portion 25A ″.
The guide rod 11 is pressed by the contact of the stopper 14 with the stopper 125.
6 shows the position where 6 is temporarily stopped from moving.
The sine curve of the elastic member 25A is deformed by the leg hole 3 of the brief 1 shown in FIG.
And it is made to improve the wearability in conformity with the shape of the front crotch part of the wearer.

The web 27, on which the elastic members 25A and 25B are arranged as described above, is pressed by the pressing roller 104, and the elastic member is bonded to the web. At this time, as shown in FIG. 4 (C), the portions 25a of the elastic members 25A and 25B that are not located in the bonding area 30a contract and take a substantially linear shape.

Referring again to FIG. 3, the top sheet 6
The continuous web 26, which is the material of
And the width direction tension roller 127 for the web, and is guided to the adhesive application portion 128 including the rollers 128a, 128b, 128c and 128d. In the coating part 128, as shown in FIG. 4 (D), a hot melt adhesive is applied to the central region of the web 26 at predetermined intervals in the length direction of the web 26 to form an elliptical adhesive which is slightly longer in the width direction. Area 30
b is provided. The shape, size, and spacing of the adhesive zone 30b are substantially the same as those of the adhesive zone 30a. at the same time,
The web 26 has a straight bonding area 31 extending from both sides of the bonding area 30b to both side edges of the web 26, and a straight bonding area 32 continuous along both side edges of the web 26 in its length direction. It is provided by applying a hot-melt type adhesive in the applying section 128. Further, the web 26 is guided through the widthwise tensioning roller 129 between the rotary drum 106 and the pressure roller 130 that is in contact with the rotary drum 106.

On the other hand, the continuous elastic member 24, which is the material of the elastic member 4, is stretched to a required ratio by the tension roller 131 and, as shown in FIG. Guided to be placed along.

Referring again to FIG. 3, the individual cores 8 preformed by the porous belt conveyor 133 moving on the upper surface of the device 132 having a weak suction action and spaced from each other by a predetermined distance are guided to the assembly station 105. . The core 8 is formed in an hourglass shape as shown by a chain line in FIGS. 2 and 4 (C), and has two adjacent adhesive areas 30a.
Between the adjacent loop portions formed by the elastic members 25A and 25B. Also,
The web 27 on which the core 8 is arranged has the adhesive area 30.
The webs 26 are superposed so that a and 30b match. As a result, the loop portions of the elastic members 25A and 25B are sandwiched between the adhesive areas 30a and 30b, and the elastic member 24 is sandwiched between both side edges of the webs 26 and 27. Thus, the core 8 is placed between the webs 26 and 27.
The elastic member 24, 25A, 25B is sandwiched between the rotary drum 106 and the pinching roller 130 to form a continuous composite web 28 while being sandwiched between the rotary drum 106 and the pinching roller 130.
The core 8 and the elastic members 24, 25A, 25B are fixed in the inside 8.

The core 8 in the composite web 28 has a pedestal 13
The pressure is applied by the embossing section 137 composed of the belt conveyor 135 moving on the upper surface of No. 4 and the pressing roller 136 and guided to the heat (or sonic) sealing roller 138. The composite web 28 includes the elliptical area 21 between the adjacent cores 8 shown in FIG. 5A and the straight portions 22 extending from both sides thereof to the respective side edges of the composite web 28.
It is heat-sealed to the extent that it does not harden. However, this step is not always necessary.

The composite web 28 treated in this way is guided to the roller cutter 140 through the guide roller 139 and the central portion 21 'of the elliptical region 21 shown by the oblique lines is cut off, whereby the leg hole notch 23 is formed. It is formed. The central portion 21 'is a part of the webs 26, 27 located inside the annular area formed by the adhesive areas 30a, 30b and the elastic members 25A, 25B adhered thereto.

The composite web 28 having the notch 23 formed therein is guided to the folding means 142 via the guide roller 141. Although the structure of the folding means 142 is not shown, it may be a known structure in a manufacturing apparatus such as disposable diapers and sanitary napkins. The composite web 28 is folded in two by the folding means 142 as shown in FIG. 5 (B) along the longitudinal centerline 34 shown in FIG. 5 (A).

The composite web 28 folded in two is guided to the heat (or sonic) sealing roller 143,
As shown in FIG. 5 (C), by providing the two strip-shaped heat-sealing regions 36 that are spaced apart and opposed to each other along the vicinity of the virtual cutting lines 35 on both sides of the adjacent briefs 1 by the heat-sealing roller 143, Formed in a continuous brief 29.

The continuous brief 29 is guided to the roller cutter 144 via the guide roller 145, and as shown in FIG.
The individual briefs 1 are obtained by being divided at 6. The strip-shaped heat-sealing areas 36 on both sides of each of the obtained briefs 1 are harder than the non-heat-sealed portion, but are not located on both sides of the brief 1, in other words, the outer edges thereof are left behind. Therefore, the outer edge of the hard band-shaped heat seal 36 does not rub and hurt the wearer's skin. Such individual briefs 1 are transferred by a belt conveyor 146 to a packaging process (not shown).

A liquid-permeable web is used for the continuous web 27, which is the material of the backsheet 7, to prevent leakage of body fluid from at least the central surface area occupied by the core 8 on the backsheet. If it is desired to make the area liquid impermeable, a liquid impermeable web such as a plastic film, preferably a stretchable web, is bonded to the central surface area of the web 27 before the elastic members 25A and 25B are arranged. do it. In this case, in FIG. 3, the coating roller 14 that is in contact with the pressure roller 147 is in contact with the central surface area of the web 27.
At 8, the hot melt adhesive is applied in a scattered manner, and the liquid impermeable continuous web 40 is bonded to the central surface area. Therefore, in this case, the application of the adhesive by the application unit 102 and the arrangement of the elastic members 25A and 25B are performed by the web 40.
And a part of the web 27. The webs 26, 27 are preferably stretchable non-woven fabrics in the longitudinal and transverse directions, at least in the transverse direction, and the core 8 is formed by mixing fluff pulp with superabsorbent polymer powder. For 25A and 25B, a natural or synthetic rubber or a plastic exhibiting elasticity by heat treatment is preferably used. The core 8 may not be used for the brief depending on the intended use of the brief.

The step of cutting out the portion 21 'of the composite web 28 to form the notch 23 for the leg hole is the step of FIG. 5B instead of the step of FIG. 5A. Good.

[0029]

The device of the present invention has the following effects. 1) In designing a desired brief, if necessary, by appropriately setting the direction and angle of the yarn guide holding portion of the traverse means that traverses the continuous web, the mutual spacing of the elastic yarns in the finished brief can be set to, for example, By gradually increasing the size from the central part of the inseam of the brief to the waist part thereof, and further by appropriately setting the movement amount of the thread guide holding part of the traverse means, the central part of the substantially U-shaped elastic members of the brief. Can be close to, in contact with, intersecting with or apart from each other in the crotch region. 2) Since each traverse means moves the continuous elastic member forward and backward so as to draw a sinusoidal curve on the continuous web, the means for controlling the forward and backward movement of each traverse means, for example, the cam surface of the cam mechanism is gentle. Curves are good,
Moreover, the yarn guide holding portion of each traverse means only needs to be moved forward and backward in each half area in the width direction of the substantially central area of the continuous web in which the continuous elastic member is to be arranged. Therefore, let the continuous elastic member draw a smooth curve such as a sudden change from a curve to a straight line or a straight line to a curve, or a curve having a large radius of curvature and a small radius of curvature. Moreover, as compared with a device having a traverse means and a cam mechanism that moves the yarn guide holding portion over the entire widthwise direction of the central region of the continuous web in which the continuous elastic member is to be arranged, the rotation operation of the cam mechanism and the traverse means Since the advancing / retreating operation can be smoothly and lightly performed and the speed can be increased, the continuous elastic member can be arranged on the continuous web at a high speed, and thus the brief can be mass-produced at a high speed and at a low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of a disposable brief to be manufactured by the device of the present invention.

FIG. 2 is an exploded perspective view of the brief.

FIG. 3 is a schematic view of an apparatus for manufacturing the briefs.

FIG. 4 is a partial plan view showing a process of assembling a brief according to FIGS.

5A to 5C are partial plan views showing the process of assembling the brief according to FIGS.

FIG. 6 is a partially enlarged perspective view of traverse means in the apparatus.

FIG. 7 is a partial sectional view of the traverse means.

FIG. 8 is a cross-sectional view showing a traverse deformation mechanism in the traverse means.

FIG. 9 is a layout plan view of an elastic member that is deformed by the traverse deformation mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Brief 21 'Excision part 23 Notch 24, 25A, 25B Continuous elastic member 26, 27 Continuous web 28 Continuous composite web 29 Continuous brief 30a, 30b Annular adhesion area 32 Strip adhesive area 36 Heat seal area 108,109 Traverse means 118a, 119a Thread guide holder

Claims (2)

(57) [Claims] 1. An elastic member for both leg holes comprises a first elastic member and a second elastic member, and the first elastic member and the second elastic member are curved in a substantially U shape having a central portion and side portions, respectively. The central portion of the first and second elastic members is made to cross between the both leg holes, and the both side portions of the first elastic member are arranged along substantially front halves of the both leg holes, and (2) A manufacturing apparatus for a disposable brief in which the both sides of the elastic member are respectively positioned along the remaining second half of the both leg holes, comprising: a) a plurality of first yarn guide holding portions arranged in parallel with each other. Each elastic yarn in the stretched state held in each of the first yarn guide holding portions has a forward / backward movement so as to intersect with the moving direction on a substantially half region in the width direction of the substantially central region of the moving continuous web. The first continuous elastic member consisting of First traverse means for displacing and bending at a constant cycle so as to draw a sinusoidal curve in a direction intersecting the moving direction on the continuous web, and b) a plurality of second yarn guide holding portions arranged in parallel with each other. A second continuous elastic member made of elastic yarns in an extended state held in each of the second yarn guide holding portions and moving forward and backward so as to intersect the moving direction on the remaining half region of the approximately central region. On the continuous web at a constant period so as to draw a displacement curve of a sine curve shape curve of the first continuous elastic member in a direction intersecting the moving direction and a sine curve shape curve facing each other in the width direction of the continuous web. Second traverse means for displacing and bending; and c) means for pressing and fixing the first and second continuous elastic members on the continuous web in the displacing and bending state with an adhesive. The manufacturing apparatus. 2. The apparatus according to claim 1, wherein the first and second traverse means are arranged in parallel with each other in the moving direction of the continuous web.