JPH03165763A - Attaching fastener tape to disposable diaper - Google Patents

Abstract

PURPOSE:To increase the adhesion strength of a fastener tape and sufficiently meet the high speed production of disposable paper diapers by fixing the edge part of a fastener tape on a liquid nonpermeable reverse surface sheet by a hot melt type adhesive when the fastener tape of the disposable diaper is attached and carrying out heating and pressurization by heating rolls. CONSTITUTION:A fastener tape 4 which is printing-treated is sent into a folding process II. In the folding process II, the part projecting outward at both the side edges of the lamination body S of the fastener tape 4 is bent to a reverse surface sheet 1 side, and attached to the reverse side of the reverse surface sheet 1 by an adhesive 9 for the fastener tape 4. After the bending in the folding process II, the fastener tape 4 is sent into the pressurization process III. The pressurization process III consists of heating rolls 11, and the part of the fastener tape 4 which is attached by the bending at both the side edges of the lamination body S is squeezed by the upper and lower heating rolls 11, and heated at 70-100 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for attaching a zipper tape to a disposable diaper, and more specifically, it provides an attaching method that improves the strength of attaching the fastener tape to the diaper body. be.

[Prior Art] Disposable diapers are made by sandwiching a stretchable elastic body and an absorbent body (hereinafter simply referred to as absorbent body) between a liquid-permeable top sheet and a liquid-impermeable back sheet, and then inserting them into the back of the diaper or The tape is attached by applying adhesive such as hot melt to predetermined positions on both ends of the abdomen, transferring the fastener tape, and applying pressure.

Generally, the pressure roll used when attaching the fastener tape has a diameter of 100+++ m or less due to the space and balance of the diaper processing machine.

In recent years, it has been desired to increase the processing speed of processing machines in order to improve the productivity of diapers, but in this case, the pressing time of the fastener tape decreases, resulting in a problem that the fastener tape attachment strength decreases.

As a countermeasure, conventional methods have been taken such as using a fastener tape with strong adhesive strength or applying a corrosive discharge treatment to the back sheet to strengthen the adhesive property.

[Problems to be Solved by the Present Invention] All of the conventional methods described above are inconvenient in that they are expensive, require special equipment for corona discharge treatment, and further increase the number of processing steps. There is also a method of increasing the pressure of the pressure roll, but excessive pressure causes problems such as destruction of the material.

The present invention improves the above-mentioned conventional drawbacks, increases the strength of attaching fastener tapes to disposable diapers, and provides an attaching method that can sufficiently withstand high-speed production of disposable diapers.

[Means for Solving the Problems] When attaching a zipper tape to a disposable diaper, the present invention fixes the ends of the zipper tape to a liquid-impermeable back sheet with a hot melt adhesive, and then heats the zipper tape at 70 to 100°C.
The structure is such that it is heated and pressurized using heating rolls.

[Example] Figure 1 shows an example of the manufacturing process of disposable diapers.
The figure shows the fastener tape installed,
The present invention will be described in detail below with reference to these drawings. As shown in Fig. 1, absorbers 2 are placed at regular intervals q on a continuous liquid-impermeable backsheet (hereinafter referred to as backsheet), and a continuous liquid-permeable topsheet is placed on the surface of the absorbent body 2 at regular intervals q. (
(hereinafter referred to as the top sheet) 3 are stacked, the absorber 2 is sandwiched between the back sheet l and the top sheet 3, and the flow direction of the sheets (
After bonding both ends (in the direction of the arrow in FIG. 1) to form a laminate S, the laminate S is transferred to a fastener tape attaching step.

The fastener tape attaching process consists of a transfer process 1, a folding process II, and a pressurizing process (2), which are respectively arranged at both ends of the laminate S in the flow direction.

Transfer process I includes fastener tape 4 and release tape 5.
are pasted together with a laminating roll 6, cut into a predetermined width with a cutter 7, and then transferred with a transfer roll 8 to both ends of the laminate S in the flow direction at regular intervals as shown in FIG.

FIG. 3 shows a state in which the fastener tape 4 and the release tape 5 are bonded together.
One end is slightly bent to form a bevel 10, and
A release tape 5 is pasted from the approximate center of the fastener tape 4 to the knob 10.

As shown in FIG. 3, the fastener tape 4 with the release tape 5 pasted thereon is then bonded to the surface sheet 3 of the laminate S, where the release tape 5 is made of viscous M9, as shown in FIG.
The unlaminated portions of the release tape 5 are attached to both ends of the laminate S in a state of protruding outward as shown in FIG. In addition, FIGS. 3 and 4 show the people laminate S.
Although one end of the fastener tape is shown, the fastener tape on the opposite end shall be attached symmetrically and in the same manner as above.

The fastener tape 4 transferred as shown in FIGS. 2 and 4 is then sent to the folding step 12. The folding process I
I bends the outwardly protruding portions of both ends of the laminate S of the fastener tape 4 shown in FIG. 2 toward the back sheet L side as shown in FIG. At step 9, adhere to the back side of back sheet 1.

After being bent in the bending process II as described above, it is sent to the pressurizing process. The pressurizing step (2) consists of a heating roll 11 as shown in FIG. 1, and a fastener tape that is bent and attached at both ends of the laminate S, as shown by the dotted line in FIG. Heat the upper and lower parts of 4! 1 and heat to 70 to 100°C.

The heating roll 11 has a diameter larger than the conventional one, 120~
The diameter is 250mm, which is different from the conventional diameter In(
The fastener tape installation strength can be increased by approximately 50% compared to a method that is simply pressurized at room temperature or less.

In addition, the heating roll 1 used in the present invention! Various commonly used materials such as carbon steel, stainless steel, or hard rubber can be used as the material for the heating roll! 1, it is necessary to set the roll width and the mounting position so as not to contact the absorbent body 2.

The laminate S obtained as shown in FIG. 1 may be cut into predetermined lengths to make individual disposable diapers.

Although the embodiment in which the fastener tape is attached to the outside of the backsheet has been described above, the present invention is naturally applicable to the case where the fastener tape is attached between the backsheet and the topsheet.

[Effects of the Invention] As described above, when attaching a zipper tape to a disposable diaper, the present invention heats and pressurizes the adhesive portion with a heating roll having a larger diameter than conventional diapers, thereby increasing the adhesive strength of the zipper tape and making it possible to attach the zipper tape to a disposable diaper. It is possible to mount it sufficiently to cope with high-speed production of diapers.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of an example of the manufacturing method of disposable diapers, Figure 2
The figure is an explanatory diagram of the fastener tape attached state obtained by the method of Fig. 1, Fig. 3 is a sectional view of an example of the fastener tape, and Fig. 4 is a sectional view of the main part of the state in which the fastener tape is transferred to the laminate. FIG. 5 is an explanatory diagram of the folded state and the pressurized state. 1: Transfer process, II: Folding process, ■: Pressure culm, l
: Back sheet, 2: Absorber, 3: Top sheet, 4: Zipper tape, 5-inch IJ-stave, 6: Laminating roll, 7: Cutter 8: Transfer roll, 9: Adhesive,
■0: Knob, 11: Heating roll.

Claims (1)

[Claims] When attaching a zipper tape to a disposable diaper, the ends of the zipper tape are fixed to a liquid-impermeable back sheet with a hot melt adhesive, and then heated and pressurized with a heating roll at 70 to 100°C. How to install zipper tape.