JPH0144801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a disposable diaper or a simple diaper cover (hereinafter referred to as a sanitary product) in which a thread-like stretchable elastic member is attached to a considerable portion of the sanitary product that is brought into close contact with the wearer's legs in a compressed state when the wearer wears the diaper. Regarding how to put on.

Conventionally, a flat belt-shaped rubber material having a thickness of 0.25 mm and a width of 6.5 mm is used as an elastic member around the legs of this type of sanitary products, particularly disposable diapers, which have been put into practical use.

Conventional sanitary products that use this type of stretchable elastic member apply strong localized pressure to the wearer's leg area in a linear manner, resulting in pressure marks on the leg area and furthermore, when worn for a relatively long period of time. It has drawbacks such as causing pain to the wearer.

In order to eliminate such drawbacks, it has been proposed to use a relatively wide flat belt-like rubber material as the elastic member, but in such a case,
It is disadvantageous in the following points.

In other words, due to the processing technology, it is difficult to form this type of flat belt-shaped rubber material to a thickness of 0.25 mm or less, which is the thickness of conventional rubber materials, and even if it were possible, the thickness would not be uniform throughout. It is extremely difficult to achieve this.
Therefore, if a conventional rubber material is formed with a wide width and used at the same elongation ratio as the conventional rubber material, the tensile stress will be too strong and the compressive force on the wearer's leg area will be too strong. . Therefore, in order to obtain the tensile stress that is generally considered appropriate for leg compression,
It is necessary to reduce the elongation magnification depending on the width of the rubber material. This means that as a stretchable elastic member, the amount of material for the wide width of the rubber material,
In addition, lowering the elongation magnification results in an increase in the amount of material due to the extra length required, resulting in higher costs. The high cost is extremely disadvantageous in practical terms, especially for products that are provided at low cost, such as disposable diapers.

Such a drawback can be solved by using a plurality of thread-like rubber materials as the stretchable elastic member. However, since this type of sanitary products are disposable products, they need to be mass-produced at low cost.
Moreover, it is necessary to attach the stretchable elastic member to the back sheet made of plastic film, etc., which is a component of the sanitary product, and/or the top sheet made of non-woven fabric, etc. However, it is not possible to use a fabric in which a thread-like rubber material is woven into a woven fabric.
Therefore, in order to attach a thread-like rubber material to this type of sanitary product, the rubber material must be adhered to the component through an adhesive. However, unless the thread-like rubber material is very thin compared to the conventional flat belt-like rubber material conventionally used in this type of sanitary products, especially disposable diapers, the above-mentioned drawbacks cannot be solved. Although it is difficult to
The thinner the thread-like rubber material is, the more difficult it is to handle it, making it impossible to attach it to sanitary products with the same efficiency as conventional flat belt-like rubber materials, making it difficult to put it into practical use. Not suitable for

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method that allows highly efficient attachment of a plurality of extremely thin elastic members to sanitary products.

To achieve the above object, the present invention is characterized by providing a stretchable elastic member having a flat belt shape in which a plurality of thread-like rubber members are joined to such an extent that they can be easily separated by a slight tensile force. When separating the stretchable elastic member into a plurality of thread-like rubber materials and adhering them to sanitary products via an adhesive, before separating the stretchable elastic member into a plurality of thread-like rubber materials, The present invention relates to a method for attaching a stretchable elastic member to a sanitary product, which comprises stretching the stretchable elastic member to a desired magnification while maintaining the flat belt shape.

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

1 and 2, a disposable diaper is shown as an example to which the method of the present invention is applied, and the diaper 1 includes a water permeable top sheet 2 made of plastic film or the like, a back sheet 3 made of nonwoven fabric or the like, these sheets 2, 3, and these sheets 2,
3 includes a longitudinally mounted elastic member 6 in a side flap 5 formed by joining together. The cross-sectional area of one member 6 is
Consisting of 0.01-0.9 cm ² thread-like rubber-like 6 ₁ , 6 ₂ , 6 ₃ ,
These are attached with a hot melt adhesive (not shown) in a state where they are appropriately stretched in the longitudinal direction.

In FIG. 3, a stretchable elastic member 6 for use in the method of the present invention is shown, and the member 6 consists of thread-like rubber materials 6 ₁ , 6 ₂ , 6 ₃ each having a cross-sectional area of 0.01 to 0.9 mm ² arranged in parallel. Groups 6 of three of them are integrally joined via constricted portions 7 to such an extent that they can be easily separated by a slight tearing force between them.
a, 6b, and the groups 6a, 6b are slightly joined to the extent that they can be separated more easily than the constricted part 7 at the opposing side parts 8 of the adjacent thread-like rubber materials ₆₃ , ₆₃ . It has a flat belt shape. The constricted portion 7 is made of thread-like rubber material 6 ₁ ,
Parts of 6 ₂ and 6 ₃ were fused together, and this was caused by contacting them after molding and before solidification. The joint side surface portion 8 is
In order to prevent the thread-like rubber materials 6 ₁ , 6 ₂ , and 6 ₃ from adhering to other objects during the molding process, they are slightly adhered to each other through powder such as talc that is sprinkled on them. Therefore, the flat belt-like member 6 is
The powder is attached to the entire surface, and is removed as necessary during use.

In FIGS. 4 to 6, a schematic diagram of an apparatus for carrying out the method of the invention is shown. The apparatus includes a supply/extension mechanism section A for the flat belt-like stretchable elastic member 6, a separation mechanism section B for the member, and a mechanism section C for applying the member to the diaper.

The supply and extension mechanism section A includes a supply roll 9, a guide roll group 10, a feed nip roll 11, a tension nip roll 12 whose peripheral surface rotation speed is higher than that of the nip roll, and a brushing roll 13 disposed between the two nip rolls. There is.

The separation mechanism section B includes first separation rods 14, 14 that stand apart from each other in the lateral direction, nip rolls 16 that are supported at intervals in the axial direction of a rotating shaft 15 that is supported horizontally, 16, second separation rods 17a, 17b supported at a distance lower than the two nip rolls and spaced apart vertically; second separation rods 17a, spaced apart in the axial direction of the rotating shaft 18 supported horizontally; The first guide rolls 19, 19 are supported higher than the first guide rolls 17b, and the rotation shafts 20, 21 are supported at intervals in the axial direction of the rotating shafts 20, 21, which are supported lower than the first guide rolls and spaced apart from each other in the front and back. The second guide rolls 22, 22, 2
3, 23, and grooves 24 ₁ , 24 ₂ , 24 ₃ carved on the circumferential surface at intervals corresponding to the intervals applied to the diaper described later at intervals in the axial direction. It includes first and second spacing regulating rolls 25 and 26 at the bottom.

The application mechanism section C includes a rotating drum 27, pressure rolls 29, 29 supported on the drum at intervals in the axial direction of the rotating shaft 28, a tension adjustment roll 30, and a diaper back sheet (or top sheet, the same applies hereinafter). 31 supply roll 32, diaper top sheet (or back sheet, same hereinafter) 3
3 supply roll 34, hot melt adhesive application nozzle 35 or 36, 37, 38, conveyor belt 39 of diaper absorbent body 4, and top sheet 3
3 reversing guide rolls 40 and the like.

The flat belt-like elastic member 6 fed out from the supply roll 9 is guided by a guide roll group 10, a feed nip roll 11, a brushing roll 13, and a tension nip roll 12, and the brushing roll 13 removes talc, etc. attached to the surface of the member 6. The powder is removed, and the feed nip roll 11 and the tension roll 1
2, the material is expanded to an appropriate expansion rate and transported. Although not shown, the powder removed from the member 6 is sucked into a tank by a suction or the like placed near the brushing roll 13 so as not to be scattered around. The member 6 that has passed through the tension nip roll 12 is positioned outside the first separating rods 14, 14 and distributed into groups 6a, 6b while maintaining the elongated state,
Guided by Nipprol 16,16. The groups 6a, 6a pass through the nip rolls 16, 16, while maintaining the above-mentioned elongated state, the thread-like rubber materials 6 ₁ , 6 ₁ pass through the lower surface of the second separating rod 17a, and pass through the guide roll 23,
The thread-like rubber materials 6 ₂ and 6 ₂ are on the upper surface of the guide rolls 22 and 22 through the lower surface of the second separating rod 17b, and the thread-like rubber materials 6 ₃ and 6 ₃ are on the upper surface of the guide roll 1
By being supported in a stretched state on the upper surfaces of 9 and 19, they are each separated into three pieces.

The thus separated thread-like rubber materials 6 ₁ , 6 ₂ , 6 ₃
The grooves 24 ₁ and 24 on both sides of the first and second spacing regulating rolls 25 and 26 are maintained in the stretched state.
₂ and 24 ₃ and are regulated at predetermined intervals, the diaper back sheet 31 is fed from the supply roll 32 onto the rotating drum 27, and the diaper back sheet 31 is fed from the supply roll 34 onto the rotating drum 27 via the reversing roll 41. It is fed between the top sheet 33 of the diaper and the back sheet 3 through the nozzle 35.
It is glued on the line of hot melt adhesive applied to the inner surface of the 1. Although not shown, this adhesive is applied to both sides of the back sheet 31 in the width direction at the same intervals as the grooves 24 ₁ , 24 ₂ , 24 ₃ and when the completed diaper is unfolded as shown in FIG. The thread-like rubber materials 6 ₁ , 6 ₂ , and 6 ₃ attached to this are applied to approximately the same length as those in the extended state, and such application is performed at regular intervals in the length direction of the back sheet 31 . This is done intermittently. On the other hand, each absorbent body 4 formed in advance for one diaper
are fed at regular intervals between the back sheet 31 and the top sheet 33 and between the bonded thread-like rubber materials 6 ₃ and 6 ₃ . On the other hand, a hot melt adhesive is applied to the inner surface of the back sheet 31 by a nozzle 37 for bonding it to the lower surface of the absorbent body 4, and on the inner surface of the top sheet 33,
A hot melt adhesive for bonding this to the upper surface of the absorber 4 is applied to both sheets 31 and
At the same time, a hot melt adhesive is applied continuously in the longitudinal direction of the sheets 33, and at the same time, a hot melt adhesive is applied continuously by a nozzle 37 or 38 for bonding the parts where the two sheets 31 and 33 meet. The zones of thread-like rubber materials 6 ₁ , 6 ₂ , 6 ₃ on both sides interposed and bonded between the back sheet 31 and the top sheet 33 are formed by the pressure roll 29 ,
29 to ensure the adhesive state. A continuous body of diapers is thus formed, which is transferred via the tension adjustment roll 30 to the next cutting process by the pulling roll 42. In this transfer process, the continuous body of the diaper is made of thread-like rubber materials 6 ₁ , 6 ₂ , 6 ₃ interposed and bonded between the back sheet 31 and the top sheet 33 .
Appropriate tension is applied to keep the diaper in the stretched state, but in the next cutting process, the single diaper (see Figure 1) is cut into one diaper from the diaper continuous body. Thread-like rubber material 6 ₁ , 6
Due to their own shrinkage elasticity, the longitudinal ends of the diaper ₂ and 6 ₃ automatically draw inward from the ends of the single diaper in the same direction at the same time as they are cut. Incidentally, this cutting is performed between the respective absorbent bodies 4 which are interposed and bonded at regular intervals in the longitudinal direction of the continuous diaper body, that is, between the thread-like rubber materials 6 ₁ , 6 ₂ ,
6 ₃ is made at the longitudinal interruptions of the adhesive.

Thread-like rubber materials 6 ₁ , 6 ₂ , 6 ₃ are placed on a back sheet 31
Hot melt adhesive for adhering to the inner surface of
It may also be applied directly to the thread-like rubber materials 6 ₁ , 6 ₂ , 6 ₃ using the nozzle 36 . In this case, although not shown, it is preferable that the adhesive is intermittently discharged from the nozzle 36 and applied to the thread-like rubber materials 6 ₁ , 6 ₂ , 6 ₃ intermittently. Alternatively, the adhesive may be applied from above to the inner surface of the back sheet 31 with the thread-like rubber materials 6 ₁ , 6 ₂ , 6 ₃ positioned thereon. Further, as _shown by reference numeral _{43 in} FIG. The yarn rubber material may be bonded between each of these adhesives 43, 43 by applying the adhesive along the longitudinal direction of the rubber material. These bonding methods are extremely effective in reliably bonding the thread-like rubber materials 6 ₁ , 6 ₂ , 6 ₃ to the inner surface of the backsheet 31 at desired intervals.

In the above explanation, the case where three thread-like rubber materials are attached to one side of the diaper has been described, but depending on the cross-sectional area of the thread-like rubber materials,
A range of 2 to 60 pieces are attached to one side of the diaper, and in that case, it is not necessary that they be separated one by one, but multiple pieces may be attached and attached separately, or It is sometimes installed in a combination of a plurality of pieces connected and separated, and a piece separated into a single piece. For example, 4
In the case of more than one book, two pieces are attached and separated, or a combination of two pieces attached and separated and one piece separated. It is also sometimes installed.

According to the present invention, as described above, there is provided a stretchable elastic member having a flat belt-like shape in which a plurality of thread-like rubber members are joined to such an extent that they can be easily separated by a slight tensile force, and Since the elastic member is stretched to a desired magnification in its flat belt-like form before being separated into a plurality of thread-like rubber materials, these thread-like rubber materials do not break or become tangled during the feeding and stretching process. In addition, it is extremely easy to process at high speed with almost no problems, and all of these thread-like rubber materials are attached to sanitary products while maintaining a substantially uniform elongation state at a desired magnification, which prevents the production of sanitary products with uneven elongation ratios. This can be prevented.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway developed plan view of a diaper equipped with a stretchable elastic member according to the method of the present invention. Figure 2 shows
FIG. 1 is a partially cutaway enlarged plan view taken along line XX. FIG. 3 is an enlarged sectional perspective view of a stretchable elastic member used in the method of the present invention before separation. FIG. 4 is a schematic side view of an apparatus for carrying out the method of the invention. FIG. 5 is a plan view of the supply/extension and separation mechanism section of the elastic section in the device. FIG. 6 is a perspective view of a state in which the elastic member is applied in the application mechanism section of the elastic member in the apparatus. FIG. 7 is a sectional view showing another example of attaching the stretchable elastic member to the back seat. 6...Stretchable elastic member, 6a, 6b...Group, ₆₁ , ₆₂ , ₆₃ ...Thread-like rubber material.

Claims (1)

[Claims] 1. A stretchable elastic member having a flat belt shape in which a plurality of thread-like rubber members are joined to an extent that they can be easily separated by a slight tensile force is supplied, and the stretchable elastic member is attached to the plurality of thread-like rubber members. When separating them and bonding them to sanitary products via an adhesive, the stretchable elastic member is stretched to a desired magnification while remaining in the flat belt-like form before being separated into a plurality of thread-like rubber members. A method for attaching a stretchable elastic member to sanitary products.