Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Reexamination Certificate
2000-06-28
2004-05-04
Lo, Weilun (Department: 3761)
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
C604S378000
Reexamination Certificate
active
06730067
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a feminine hygienic pad which is convenient for use.
PRIOR ART OF THE INVENTION
There is the general tendency that a feminine hygienic pad is replaced with a new pad at the time of using a toilet even when the sheet of a fluid-absorbing material still has the absorbing ability, and the used pad is disposed.
Development of feminine hygienic pads has mainly been focused on increasing the ability to absorb fluid. However, further increase in this ability is rather meaningless when the above tendency is taken into consideration.
In order to replace a feminine hygienic pad every time using a toilet, several pads must be brought along as replacements when traveling outside the home. Several pads are rather bulky although recent pads are made compact, and this situation causes inconvenience.
Therefore, when women are dressed in a fashionable manner to carry several pads necessitates the carrying of a handbag large enough to carry several pads.
Young women such as student girls who feel shyness to a large extent tend to dislike using a toilet for a long time. However, taking feminine hygienic pads with them to school or on a trip causes inconvenience with respect to the place for keeping the pads and the place and time for replacing the pads in a limited time and space.
Accordingly, the present invention has an object of providing a multi-layer feminine hygienic pad which does not require bringing many pads along as replacements, reduces the troublesome handling to attach the pad to a desired place of an underwear to once with a plurality of composite absorption sheets, and can reduce the time necessary for replacing a used composite absorption sheet with a fresh sheet to a great extent. The present invention also has the object of providing a process for producing the above multi-layer feminine hygienic pad.
SUMMARY OF THE INVENTION
The invention takes into account the following: sheets for absorption of fluid can be made very thin and have a great absorbing ability because of the progress in the fluid-absorbing materials made of water-absorbing macromolecular compounds; even when 2 to 5 sheets of the fluid-absorbing material are laminated together in conventional feminine hygienic pads which are disposed after a single use of a package, the thickness of the laminate is not much increased and the feeling during the use and the appearance do not change much because the sheet of a fluid-absorbing material is very thin before it absorbs fluid; and when 2 to 5 conventional sheets of a fluid-absorbing material are laminated together in the condition that they are separated from each other, an entirely fresh feminine hygienic layer can be exposed by simply peeling off the sheet of a fluid-absorbing material at the upper layer after use, and the same condition as that of a new feminine hygienic pad can be brought about in a short time. The result can be that the effect corresponding to attaching 2 to 5 packages of a conventional feminine hygienic pad can be realized by attaching a single package of the feminine hygienic pad and the necessity of bringing along replacement packages of feminine hygienic pads is eliminated. To attain the inventive objects a multi-layer feminine hygienic pad is provided which comprises a laminate sheet containing sheets of a fluid-absorbing material, enables easy removal of the used upper sheet of the fluid-absorbing material, and can conveniently be produced. A process for producing this multi-layer feminine hygienic pad is also provided.
Sheets of fluid-absorption having a multi-layer structure are known for increasing the absorbed amount or to prevent leaking at the sides of the pads. However, a structure which prevents permeation of a fluid absorbed at an upper layer into a sheet fluid-absorbing material laminated at lower layers is not known. In other words, the laminate structure in which individual layers of fluid-absorption are separated with separating layers which do not allow invasion of fluid, and which enables peeling off a layer from another layer easily by fingers although the individual layers are firmly fixed to their own positions, has not been known.
Accordingly, the present invention provides:
(1) A multi-layer feminine hygienic pad comprising: a laminate of two or more composite absorption sheets in which an upper composite absorption sheet comprising a sheet of a fluid-absorbing material and an upper backing sheet laminated to the lower side of the sheet of a fluid-absorbing material is laid on top of a lower composite absorption sheet comprising a sheet of a fluid-absorbing material and a lower backing sheet which has a dimension larger than the dimension of the sheet of a fluid-absorbing material and is laminated to the lower side of the sheet of a fluid-absorbing material, and peripheral part of the lower backing sheet outside the area of the sheet of a fluid-absorbing material of the lower composite absorption sheet and peripheral part of the upper backing sheet of the upper composite absorption sheet are temporarily attached together at least at two opposite edges of the peripheral parts; and a release film coated with a pressure-sensitive adhesive and attached to the lower side of a backing sheet of a lowest composite absorption sheet;
(2) A multi-layer feminine hygienic pad described in (1) wherein the peripheral part of the lower backing sheet of the lower composite absorption sheet and the peripheral part of the upper backing sheet of the upper composite absorption sheet are temporarily attached together with a layer of a pressure-sensitive adhesive disposed between the peripheral parts by pressing the peripheral parts to each other;
(3) A multi-layer feminine hygienic pad described in (2) wherein the layer of a pressure-sensitive adhesive is disposed on the lower side of upper composite absorption sheet;
(4) A multi-layer feminine hygienic pad described in (2) wherein a layer of a releasing agent is disposed between the layer of a pressure-sensitive adhesive and the peripheral part of the lower backing sheet of the lower composite absorption sheet;
(5) A multi-layer feminine hygienic pad described in (1) wherein the lower backing sheet and the upper backing sheet are each made of a thermoplastic resin, and the peripheral part of the lower backing sheet of the lower composite absorption sheet and the peripheral part of the upper backing sheet of the upper composite absorption sheet are temporarily attached together by intermediate melt adhesion using an agent for preventing melt adhesion disposed between the peripheral parts;
(6) A multi-layer feminine hygienic pad described in (5) wherein the intermediate melt adhesion is made by melt cutting using a heated blade;
(7) A multi-layer feminine hygienic pad described in (1) wherein whole or a portion of the peripheral part of the lower backing sheet of the lower composite absorption sheet and whole or a portion of the peripheral part of the upper backing sheet of the upper composite absorption sheet are temporarily attached together with a layer of a heat-sensitive adhesive disposed between the peripheral parts by heat pressing the peripherals parts to each other;
(8) A multi-layer feminine hygienic pad described in (1) wherein the upper backing sheet of the upper composite absorption sheet and the lower backing sheet of the lower composite absorption sheet forming the laminate of two or more composite absorption sheets are made of a single continuous sheet which is folded at the boundary line of the upper backing sheet and the lower backing sheet and has two perforation lines in the vicinity of the boundary line;
(9) A multi-layer feminine hygienic pad described in (8) wherein the upper side of the lower composite absorption sheet and the lower side of the upper composite absorption sheet are temporarily attached together with an adhesive material along edges of the lower absorption sheet and the upper composite absorption sheet opposite to the folded boundary line;
(10) A multi-layer feminine hygienic pad described in (1) wher
Nukina Mica
Ohtani Mitsuo
Uchiyama Atsushi
Uchiyama Mitsuko
Uchiyama Mitsuru
Lo Weilun
Mica Nukina
Stephens Jacqueline
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