JPS6088103A - Production of disposable diaper - 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 The present invention relates to a method of manufacturing a disposable diaper, and more particularly to a method of continuously attaching an elastic member to a component of the diaper.

Conventionally, diapers with elastic members for elastically tightening the crotch area and the lung opening of the unused diaper have been known and put to practical use.-4 This type of diaper is manufactured continuously. At this time, methods for attaching an elastic member to a continuous web, which is a constituent member of a diaper, can be roughly divided into fLt-(1) When the continuous elastic member is fully stretched,
Continuously adhere to the continuous web while applying adhesive, and after the adhesive hardens, 51# of adhesive! a method of cutting in the application zone and contracting the cut ends so that lengths of elastic members are attached to the continuous web at predetermined intervals;
) Continuous elastic members (stretched, continuously coated with adhesive, cut into predetermined lengths, and then attached to a continuous web at predetermined intervals).

In the method (1) above, the continuous elastic member is bonded to the continuous web (having the advantage that it is relatively easy to feed the continuous elastic member to the assembly stage of the diaper component and is suitable for high-speed diaper manufacturing). However, it is necessary to apply the adhesive to the continuous elastic member at predetermined intervals. After the adhesive has hardened and the continuous elastic member is cut in the non-adhesive area. , In order to shrink the cut edges of 7, 1. Usually, a continuous elastic member is interposed between two continuous webs, that is, a continuous front sheet and a continuous back sheet, and both continuous webs are simultaneously applied to a predetermined area after the tile. However, in practice, the adhesive is always applied to predetermined areas of the continuous elastic member in a timely manner, and the applied area is always applied to predetermined areas of the continuous web, i.e., another part of the diaper. Since it is comparatively difficult to position the constituent members on the predetermined sides of the individual absorbent panels that are arranged between two continuous webs at predetermined intervals in the front-rear direction, it is necessary to apply an adhesive that should have the elastic function of an elastic member. The area may shift in the front and back direction of the absorbent panel, so it is necessary to take the time to adjust the position during manufacturing.
Since there is a non-applied part of the adhesive at both ends of the elastic member that does not have an elastic function, the elastic member is uneconomical in that part; since the adhesive is applied at predetermined intervals to the continuous elastic part, it is difficult to control the application device. Because the attached elastic member R+, 7c contracts when it is cut, a contraction path is provided between the two continuous webs at the front and rear ends of the diaper (3) Necessary. However, because of this, urine may leak from the openings at the front and rear ends of the diaper; generally, the back sheet, which is one of the two webs, is made of a material that allows the elastic member to be seen through when attaching the diaper. As long as there is a thin plastic film around the entire circumference, the parts on both ends of the elastic member that are not coated with adhesive can be oriented in any direction.

It has drawbacks such as poor appearance when viewed from the outside.

In the method (2) above, the elastic member is cut to a predetermined length that can fully expand and contract and is bonded to the continuous web at predetermined intervals, so it has the advantage of being able to overcome most of the disadvantages of (1) above. However, in order to bond cut elastic members to a continuous web at predetermined intervals, the mechanism of the device for this purpose is relatively complex); the forms of usable elastic members are also limited, etc. There are drawbacks.

It is an object of the present invention to provide a method for mounting an elastic member that has the advantages of the method (t)m(z) and eliminates the disadvantages thereof. The present invention for commuting to a destination will be explained based on the illustrated embodiment.

1, 2 and 3, a continuous absorption panel 1 consisting of a defibrating valve (4) and a first stage νSl with a nip roll 6.7 is conveyed by a belt conveyor 2°3.
k and then transferred in the direction of arrow A. This continuous absorbent panel 1 has both sides 1b of the area corresponding to the crotch area of each diaper folded back inward at predetermined intervals in the length direction t'
L Therefore, the inseam area may be pre-formed in a concave shape so that it is one width narrower than the area IC corresponding to the front and rear areas of each diaper. In order to form a concave cutout shape, the entire portion may be removed in addition to the embodiment shown in the drawings.

At the same time, a highly flexible and substantially non-elastic continuous support tape 8 made of plastic film or the like is transferred to the wi1 assembly stage S1 via a guide roll 9.
A plurality of thin continuous elastic members lO are stretched to a predetermined magnification in advance and are placed in parallel with each other in a range narrower than the continuous support tape 8, and the guide a-ru li! Then, a layering agent of a sheet melt type or the like is continuously applied to the coating means 12 and transferred from f'L. In this first stage S1, the continuous elastic member 10 is applied and adhered to the upper surface of the continuous support tape 8 with adhesive, and at the same time, the front and rear regions 1a of the continuous absorbent panel L are applied. It is held in contact with the lower surface of the outer ear portion 1d of the tape and the upper surface of the continuous support tape 9 in a tiled state (see FIG. 4).

One continuous absorbent panel, this NVC adhesive (along with the continuous support tape 8 and the continuous elastic member 10), is sequentially cut into a predetermined length for one diaper by a cutter 13 and its receiving roll 14. The divided TL7c absorption panel la (divided π support tape, the elastic member is
a, 10 m), belt conveyor 3, x
D also has a high-speed belt conveyor 4 with nip rolls 15.16'i that are given a predetermined interval in the front and rear directions.
It is transferred to the 2ML finishing station S2.

Further, to the second assembly stage S2, a continuous back sheet 17 made of a plastic film or the like is coated with a hot-melt adhesive or the like by application means via guide rolls 18 and 19, and then transported to the second assembly stage S2. San.

In addition, a continuous surface sheet 21 made of nonwoven fabric or the like serves as the coating means n.
A hot-melt type adhesive or the like is applied to the product and the product is transported. At this second assembly station S2, the divided π individual absorption panels 1a are assembled into a continuous back sheet 17.
and the continuous top sheet 21, and therefore each member φ is integrally laminated and assembled into a continuous diaper. That is.

In the continuous diaper B, as shown in FIG. The adhesive layer applied to the fL7c adhesive layer and the supporting tape 8a are carefully examined.
Further, the front and back sheets are adhered to each other with the A7C adhesive part applied to the back sheet or the top sheet by the coating means 20 or the top sheet. Although not shown in the drawings, the front and back sheets and the absorbent panel la are adhered to each other with an adhesive applied by application means 20 and 22.

The assembled continuous diapers are transferred to the next dividing step (not shown) by the belt conveyor 5, and then divided into individual diapers between the front and rear areas of each absorbent panel. Ru.

(7) The belt conveyors 2, 3, 4.5 shown in FIG. 1 are made of porous or net-like materials, and the absorbent panels 1. There is a suction device 25. at the bottom of the conveyor where la contacts.
26.27.28 are located. Therefore, the absorbing panel i*1aK contact layer nπ support team 18°8& and the elastic member 10. 1Oa is kept in a predetermined elongated state and stably transferred 15tL, and during the transfer process, 7n etc. are adhered to the absorbing panel *,', 1a, and 7c adhesive 24 hardens, so it contracts and separates. In addition, the back sheet 17 and the front sheet 20 may be supplied with their vertical positions reversed as shown in the illustration.

The number and form of the elastic members 10 and 10 are not limited.

In the TL formed in each diaper, the outer ear portions 1d of the front and rear regions 10 of the absorbent panel 11L may curve unfavorably due to the contraction function of the elastic material 10a, which is located in adhesion to and n. In this case, in an appropriate process, the outer ear 1dk press (or/and apply a hot melt adhesive layer to the ear to make it relatively rigid, or apply a relatively thin rigid piece to the RAk of the elastic member 10a). It may also be glued (8) integrally with the outer ear portion 1d.

Since the manufacturing method of the present invention is configured as described above,
It is possible to achieve all of the above-mentioned objectives (Achievement 1), because all the supporting tapes are used.

Elastic member under stretching [Good stability (can support and form into one individual diaper is TL7 (in condition 1
Attaching the elastic member is extremely useful as a method, as it has the effect of being able to reduce and adjust the elastic member that contracts suddenly when the diaper is used, tightening the infant's bulge and causing pain. It is.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of an apparatus for carrying out the manufacturing method of the present invention, and FIG. 2 is a plan view of the area H in FIG. 1. Figure 3 is a plan view of the area in Figure 1 I, Figure 4 is a plan view of the area in Figure 2 A-
FIG. 5 is a sectional view taken along the line A, and FIG. 3 is a sectional view taken along the line B-B in FIG. l・One continuous absorbent panel 1a...Divided absorption panel 1b...Side part of crotch area 1Ce...Front and back area 1d...Outside 111 It: Part 2, 3.4.5...Belt conveyor 6.7...Nip roll 8...Continuous support tape 8a...e Separated π support tape 10...Continuous elastic member 101■/Separated fnyc elastic part 12 side @@Applying means 13...Cutter 1 .5,16...Nip roll 1711 Continuous back sheet addition...Coating means 21...Continuous top sheet 22...Coating means mouth...Continuous diaper No. a Prisoner 1 q-

Claims (3)

[Claims] (1) 1st and fl! 8. A method for manufacturing a disposable diaper, in which the crotch area is formed narrower than the front and rear areas in two continuous webs, an absorbent panel is interposed therebetween, and elastic members are attached under tension on both sides of the absorbent panel. A step of forming a continuous absorbent panel in series with the panel', B. Continuously applying adhesive to the continuous elastic member t-off length lever, and forming the continuous elastic member storage in the front and rear regions of the continuous absorbent panel. Adhering to the outer ear and covering with a highly flexible, substantially non-elastic continuous support tape and sandwiching the tape between the outer ear and the outer ear. 0 The continuous absorbent panel [Step of dividing the length of each absorbent panel together with the continuous elastic member and the continuous support tape D. In the dividing process, each absorbent panel 1-* first and second absorbent panels are separated at predetermined intervals in the rear direction. The elastic member interposed between two continuous webs and adhered to each absorbent panel is attached to the first and second front panels with adhesive.
The manufacturing method is characterized by comprising the steps of assembling a continuous diaper by adhering to at least one of the continuous webs, and (E) dividing the continuous diaper into individual diapers at the front and rear regions facing each of the absorbent panels. . (2) The elastic member bonded to each of the absorbent panels is bonded to at least one of the first and second continuous webs via a support tape bonded thereto with an adhesive bonded to at least one of the first and second continuous webs. Method of manufacturing disposable diapers. (3) The method for manufacturing a disposable diaper according to claim 1, wherein the elastic member bonded to each of the absorbent panels is bonded to at least one of the first and second continuous webs using the adhesive bonded thereto.