MXPA97002342A

MXPA97002342A - Tape of subjection for a sanitary article, particularly diap

Info

Publication number: MXPA97002342A
Application number: MXPA/A/1997/002342A
Authority: MX
Inventors: Schmitt Achim
Original assignee: The Procter & Gamble Company
Priority date: 1994-09-30
Filing date: 1997-03-31
Publication date: 1997-06-01

Abstract

The present invention relates to a fastening tape for a sanitary ware, particularly a disposable diaper, for fastening the article on a person's body, it is attached to the article in at least one of its end portions (18), and provided with a clamping means (22) on a surface of the other end part (20). A stretchable elastic part (30) consists of a sandwich structure of a tape section (32) of a stretchable elastic material secured to a surface of the fastening tape (10) on at least both ends (32a, 32b) ) of the same, to connect a section of the fastening tape (1

Description

TAPE OF SUBJECTION FOR A SANITARY ARTICLE.

PARTICULARLY DISPOSABLE DIAPER FIELD OF THE INVENTION The invention relates to a fastening tape for a sanitary article, particularly a disposable diaper, for fastening the article on the body of a person, the fastening needle being attached to the article in one of its end portions and being provided with an article. clamping means on a surface of the other end part, a stretchable elastic part being provided between the end portions. The invention also relates to a method for producing the fastening tape.

BACKGROUND OF THE INVENTION Conventional sanitary articles such as sanitary napkins are provided, with fastening tapes attached to the diaper and provided with a layer of pressure-sensitive adhesive in a part of it. The tapes are used to close the diaper around the wearer's body and to fasten the diaper on the body. Between these fastening tapes, there are also elastically stretchable tapes to improve the fit and: the comfort of the articles.

However, if the part of the tapes covered by the adhesive layer is stretchable, as disclosed by US Pat. No. 4,063,559 or European Patent EP-A1 0191355, the tape may be inadvertently released by peeling under a tension. default Other conventional stretchable fastening tapes, as described in EP-A2 0249 073 or EP-A1 0 487 758, consist of stretchable and non-stretchable portions which are connected in the pointed end or overlap longitudinal direction. In these cases, it has not yet been possible to provide a reliable connection between the parties under industrial conditions with acceptable costs. On the other hand, it is not easy to achieve exactly a predetermined elasticity of the tapes. If the forces necessary to stretch the tape exceed a certain limit, there will be no effect and comfortable use will not be improved. On the other hand, if the tape is too soft, an over-stretching of the tape may occur whereby the diaper may become loose or even open. Accordingly, it is an object of the invention to provide a fastening tape for a sanitary article useful for the comfortable use of the article by a comparatively smooth elasticity without the risk of over-stretching of the tape. Moreover, it is an object of the invention to provide a tape of the above type that can be easily manufactured at low costs, and a method to produce the tape accordingly.

BRIEF DESCRIPTION OF THE INVENTION To fulfill this object, a fastening tape according to the present invention is characterized in that a section of elastic stretchable tape is secured to the fastening tape at least at both ends of the missile, to connect a section of the fastening tape that is longer than the section of the elastic, stretchable tape. In this way, the invention provides a combination of an elastic band, to improve the comfortable use of the article in question, and a non-elastic band having a type of stop function that determines the maximum extension of the elastic section to prevent rupture Of the same. The tape section of the stretchable elastic material can be secured to the fastening tape at the ends of the elastic material only or along the entire length of the elastic tape, or at intervals. Securing the elastic band at intervals will be particularly appropriate, in the case that the section of the fastening tape connected by the elastic band achieves a zig-zag fold, by means of a punch, particularly by ring rolling. In this case, the valleys of the zig-zag shape can be secured to the elastic band. The tapes can be secured in intervals by means of an adhesive or also by different types of joining methods.

In any case, the length of the fastening tape, connected, by the elastic band must be longer than the elastic band in the relaxed length. In this position, the folds will appear and make it infallible that the fastening tape does not deform outside the elastic band. On the other hand, s :. the elastic band is stretched towards a predetermined position, the fastening tape will be extended to the straight position of the same where the zig-zag shape disappears Preferably, the bends are formed in the part of the fastening tape connected by the elastic band section, which disappears more and more when the section of elastic band is stretched. If the laminar unit formed by the fastening tape and the elastic band section is ring-rolled or deformed by any other pair of punches having a zigzag-shaped hook, the laminar unit will stretch. After being removed from the dies, the elastic band will return to its unstretched position while the zig-zag deformation of the fastening tape will remain. Another possibility to obtain the combination of the fastening tape and the elastic cintel would be to secure the elastic tape to the fastening tape in a pre-stretched condition. In this case, when the elastic band section is released, the corresponding part of the fastening tape will be longer than the elastic band and will deform, for example in a zig-zag fashion, in case both tapes are connected in intervals. Both possibilities, that is, a zig-zag die deformation and the securing of the elastic band section in a pre-stretched condition can be combined together. The material of the stretch elastic band section can be made of natural rubber or synthetic rubber or any comparable elastomeric material. According to the tests that the inventor has done, a stretch capacity of 2 mm / N seems to be acceptable. The material of the fastening tape is more or less non-stretchable and non-elastic under the conditions of the fastening tape used in the present context. The material thereof must be deformable as the fastening tapes are used for the applications of the present products, for example the disposable diapers sold under the Pampers brand.

BRIEF DESCRIPTION OF THE DRAWINGS Modes of the invention will be described with reference to the accompanying drawings, which do not attempt to limit the scope of the invention. Figure 1 is a cross section of the edge portion of a diaper that is provided with a fastening tape according to the invention; Figures 2 to 4 are corresponding longitudinal sections of the fastening tape according to Figure 1, illustrating the method for producing a stretchable portion of the belt elastically; Figures 5 to 7 are top views of the belt corresponding to the cross sections according to Figures 2 to 4; Figure 8 is a perspective view, on an amplified scale, of a ring rolling step for elasticly forming the stretchable portion of the belt; Figure 9 is a top view in the frame achieved by ring rolling.

DETAILED DESCRIPTION OF THE INVENTION In the following description of modalities, a diaper will be used as an example for a sanitary article according to the invention. It should be noted that there is no attempt to limit the use of the fastening tape according to the invention to diapers. The fastening tape according to the invention is also applicable to other disposable sanitary articles that are to be attached to the user's body. Figure 1 is a cross-section through the edge of a diaper that is provided with a fastening tape 10 according to the invention. The diaper comprises a back or liquid-impermeable backsheet 12, a liquid-permeable top sheet 14 facing the user's skin,? an absorbent core between them. An end portion 18 of the fastening tape 10 is adhered to the edge portion of the backsheet 12, usually by a hot melt adhesive, while the other end portion 20 of the fastening tape, on the side Right of Figure 1, is provided with an adhesive layer 22 of a pressure sensitive adhesive for closing the diaper in the well known manner. Another adhesive tape 24 adheres to the edge portion of the upper sheet 14 and is provided with a projecting end 26 adhered to the lower surface of the fastening tape 10., in Figure 1. The undersurface of the adhesive tape 24 is covered by a release layer 28, to which the adhesive layer 22 in the end portion 20 of the fastening tape is primarily attached before securing the diaper. in a user. A diaper having fastening tapes is well known in the art, and does not require any further description. According to the invention, the fastening tape 10 comprises a elastically stretchable central part 30 between the end portions 18, 20. The central part 30 will be described in detail with reference to Figure 1, in relation to Figures 2 to 7. Figures 2 to 4 show the fastening tape in a head orientation compared to Figure 1. The same have been used. reference numbers as in Figure 1 to designate identical or corresponding members. The central portion, elastically stretchable, 30 is formed by a laminar unit consisting of the fastening tape LO and a section of tape 32 of an elastic material adhered to the fastening tape with its end portions 32a, 32b, for connect the fastening tape 10 over a certain length thereof. The corresponding top view is shown in Figure 5. As shown in Figures 3 and 6, the laminar unit consisting of the central part of the fastening tape 10 and the tape section 32 of the elastic material, is passed to Through the space of a pair of two gear rollers having corresponding surfaces in the form of saw teeth, the grooves of which extend circumferentially. This method is often referred to as "ring rolling". If the laminar unit formed by the fastening tape 10 and the elastic tape section 32, moves through the space of these rollers, which have been shown in part in Figure 3 and designated by 34 and 36, both layers 10.32 are stretched in a zig-zag fashion. Since the tape section 32 is elastic, the stretching will be recovered after leaving the rollers 34,34, while the material of the fastening tape 10 is not elastic, and in this way the fastening tape will remain bent in a fan shape. in the part 30, as shown in Figure 4. Accordingly, if a stretching force is exerted on the part 30, the tape section 32 of the elastic material will stretch elastically, while the corresponding part of the tape The clamp 10 extends to a straight form in which a further extension of the elastically stretchable part 30 is not possible. The part of the clamping band 10 connected by the elastic band section 32 thus forms a type of stop that determines the extreme position of the stretch of the elastic band section. The fastening tape 10 can be cut from a continuous web 38, shown in a perspective view in Figures 8 and 9. According to Figures 8 and 9, a web 38 having a width corresponding to the length of the web. the clamping band 10 is passed longitudinally through the pair of the interengaging rollers 34,36. A ribbon 40 of an elastic material is adhered to the lower surface of the fabric 38, which is not seen in Figures 8 and 9. This belt 40 covers the lower surface of the weft 38 over a width extending slightly beyond of the course of the lower roller 34 on both sides, as can be taken from Figure 8. When the space of the rollers 34,36 passes, the consistent sheet unit of the weft 38 and the belt 40, undergoes the bending process described in connection with Figures 3 and 6. Before or after the ring rolling step, a strip of a pressure sensitive adhesive can be applied to the collar 38, to the surface not visible in Figures 8 and 9, to form the adhesive layer 22 on the underside of the fastening tape 10 shown in Figure 1. Finally, the frame 38 ss cut by the cut lines 42 as shown in Figure 9, to form the fastening tapes 10 according to Figure 1.

Claims

1. Fastening tape for a sanitary article, particularly a disposable diaper, for securing the article on the body of a person, the fastening tape being attached to the article in one of its end portions (18) and being provided with a fastening means (22) on a surface of the other end part (20), a stretchable elastic part (30) being provided between the end portions, characterized in that a section of tape (32) of a stretch, stretchable material is secured to the fastening tape (10) at least sn both ends (32a, 32b) thereof, to connect a section of the fastening tape (10), which is larger than the section of elastic, stretchable tape (32) . The fastening tape according to claim 1, further characterized in that the folds are formed in the part (30) of the fastening tape (10) connected by the elastic band section (32), the folds extending laterally with with respect to the length of the fastening tape. The fastening tape according to claim 1 or 2, further characterized in that the ends (32a, 32b) of the elastic band section (32) are secured to the fastening tape (10) by an adhesive. The fastening tape according to claim 1 or 2, further characterized in that the ends (32a, 32b) of the elastic band section (32) are secured to the fastening tape (10) by means of connections that include connection by heat and ultrasonic connections. The fastening tape according to any of claims 1 to 4, further characterized in that the fastening means (22) is formed by a layer of adhesive on a surface of the other end portion (20) of the fastener tape. subjection. The fastening tape according to any of claims 1 to 4, further characterized in that the fastening means (22) is formed by mechanical fastening means including Sailboat belts, hooks, buttons and the like. The fastening tape according to any of claims 1 to 6, further characterized in that the tape section (32) of a stretchable elastic material is secured to the fastening tape (10) over the total length of the fastener tape (10). tape section of elastic material. The fastening tape according to any of claims 1 to 6, further characterized in that the tape section (32) of a stretchable elastic material is secured to the fastening tape (10) at intervals between the ends ( 32a, 32b) of the elastic material tape. 9. Method for manufacturing a fastening tape according to any of claims 8, characterized in that the section of elastic tape (32) is secured at least to its ends (32a, 32b) to the fastening tape. to connect a central part thereof, and that the laminar unit comprising the fastening tape and the elastic tape section is inserted in a zigzag-shaped space of two dies. The method for manufacturing a fastening tape according to claim 9, further characterized in that an elongated web (38) is provided to form the fastening tapes, with a tape (40) of an elastic material which is secured against the plot in the longitudinal direction of it (38), adhering at least the lateral edges of the tape to a surface of the weft (38), and that is rolled by ring the weft strip that forms a laminar unit of the weft and the elastic tape, after that the fastening tapes are formed by cutting the weft laterally. Method for manufacturing a fastening tape according to claim 9 or 10, further characterized in that the tape section of the elastic, stretchable material is secured to the fastening tape over the total length of the tape section of the elastic material . Method for manufacturing a fastening tape according to claim 9 or 10, further characterized in that the tape section of the stretch elastic material is secured to the fastening tape at intervals between both ends (32a, 32b) of the material elastic. Method for manufacturing a fastening tape according to any of claims 9 to 12, further characterized in that the dies for deforming the unit of the fastening tape and the elastic tape section are formed by ring rolling.