JP3696042B2 - Liquid-permeable sheet and absorbent article using the liquid-permeable sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid-permeable sheet excellent in concealment that can be used under a drip-producing food or used as a top sheet of a sanitary napkin or a panty liner, and absorbency using the liquid-permeable sheet It relates to goods.
[0002]
[Prior art]
When fresh foods, particularly seafood and livestock meat, are sold at retail stores, the fresh food is placed on a tray, and the tray and the fresh food are wrapped in a wrap film.
[0003]
The seafood and livestock produce blood juice (hereinafter referred to as drip), but if this drip is left between the tray and the food, the appearance of the merchandise is impaired at the time of display. In addition, if the drip is kept in contact with fresh food for a long time, there is a risk that bacteria will propagate on the drip. In particular, in the case of livestock meat, if air does not circulate on the contact surface with the tray, it may turn dark brown.
[0004]
Therefore, a drip absorbent sheet is generally installed between the tray and the food. For example, Japanese Patent Laid-Open No. 63-283537 discloses a liquid absorbent holding material used as the drip absorbent sheet. 10 and 11 show examples of the liquid absorbent holding material disclosed in the publication.
[0005]
10 and 11 are cross-sectional views of the liquid absorption holding material. The liquid absorbent holding material 1 shown in FIG. 10 is composed of two layers, a thermoplastic resin layer 3 and an absorbent polymer layer 4, and a large number of through-holes 2 penetrating these two layers are formed. The liquid absorbent holding material 1 shown in FIG. 11 has a thermoplastic resin layer 3 formed on the uppermost layer, a protective layer 5 such as a nonwoven fabric, absorbent paper, or synthetic absorbent paper formed on the lowermost layer and absorbed by an intermediate layer between both layers. The conductive polymer layer 4 is formed, and a large number of through holes 2 are formed in the multiple layer.
[0006]
When the liquid absorbent holding material 1 is laid on a tray and fresh food such as seafood and livestock meat is placed thereon, the drip that has flowed out of the seafood and livestock meat moves downward through the through-hole 2 and absorbs. Absorbed by the polymer layer 4.
[0007]
[Problems to be solved by the invention]
However, in the liquid absorbent holding material, since the through holes are formed from the surface to the absorbent polymer layer or the protective layer which is the lowermost layer of the sheet, the drip that cannot be absorbed by the absorbent polymer layer is formed in the tray. Easy to collect on top. In addition, since the drip accumulated between the tray and the liquid absorption holding material can be visually observed from above through the through hole, the drip cannot be completely hidden, and blood juice is generated from the surface side of the liquid absorption holding material. There is a fault that is easy to see.
[0008]
The sheet requiring a concealing function is not limited to the drip absorbent sheet for foods. For example, the top sheet covering the liquid-receiving side of a sanitary napkin also conceals menstrual blood absorbed by the absorbent layer. It is preferable that the structure be able to be formed.
[0009]
The present invention solves the above-mentioned conventional problems, and aims to provide a liquid-permeable sheet excellent in concealability by preventing food drip and the like from being easily seen from the surface, and an absorbent article using the same. Yes.
[0010]
[Means for Solving the Problems]
The present invention provides a liquid-permeable sheet that is used on an absorbent layer that absorbs liquid,
A plurality of sheets, at least one of which is opaque, are stacked, and each of the plurality of sheets has a plurality of liquid-permeable passages, and the openings of the liquid-permeable passages of each sheet are sheet surfaces on opposite surfaces between the sheets. The positions are shifted from each other in the direction.
[0011]
Further, when the sheet is viewed from a direction perpendicular to the front surface, the position of the opening is shifted between the front surface and the back surface so that the opening on the back surface does not appear in the opening on the front surface. preferable.
[0012]
In this invention, since the opening part has shifted | deviated by the surface and back surface of an opaque sheet | seat, the blood juice etc. which moved to the bottom of the liquid-permeable sheet can be concealed so that it cannot be seen from the surface. Further, the drip and the food can be separated through this liquid-permeable sheet, which is hygienic. Furthermore, the lower surface of the food can be exposed to air through the liquid-permeable sheet, and discoloration of livestock meat can be prevented.
[0013]
However, even if a part of the opening on the back surface appears in the opening on the front surface, the concealing function can be exhibited.
[0018]
Moreover, absorbent articles, such as a drip absorption sheet for foodstuffs and a sanitary napkin, can be formed because the absorption layer which absorbs a liquid is covered with the liquid-permeable sheet in any one of the said.
[0019]
In this case, it is preferable that the absorption layer and the liquid-permeable sheet are joined at least partially.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a partial cross-sectional view showing a drip absorbent sheet for foods using a liquid-permeable sheet as Reference Example 1 of the present invention . FIG. 9 is an external perspective view thereof.
[0022]
A drip absorbent sheet 10 for food shown in FIGS. 1 and 9 is formed of an absorbent layer 12 that exhibits a function of absorbing liquid, and a liquid-permeable sheet 11 that covers the surface of the absorbent layer 12. The absorbent layer 12 and the liquid-permeable sheet 11 are preferably bonded to each other at least in part, but even if the liquid-permeable sheet 11 is laid on the absorbent layer 12 without being bonded. Good.
[0023]
The liquid-permeable sheet 11 is an opaque sheet, for example, a polyolefin-based or polyester-based resin film to which a white pigment or filler is added, or a resin film to which the pigment or filler is added is stretched It is.
[0024]
The liquid permeable sheet 11 is formed with a large number of liquid permeable passages 15 for allowing the drip to permeate the absorbent layer 12. The liquid permeable passage 15 has an opening 13 on the sheet surface and an opening 14 on the back surface on the absorption layer 12 side.
[0025]
The liquid permeable passage 15 is formed obliquely in the thickness direction of the liquid permeable sheet 11, and as a result, the opening 13 on the front surface and the opening 14 on the back surface are arranged so as not to overlap each other in the sheet surface direction. . When the liquid-permeable sheet 11 is viewed from the I direction perpendicular to the sheet surface, it is preferable that the opening 14 on the back surface is hidden in the opening 13 on the front surface without appearing at all. However, a part of the opening 13 and the opening 14 may overlap, but in this case, the overlapping area of the opening 13 and the opening 14 should be 1/2 or less of the opening area of the opening. Is preferable, and more preferably 1/4 or less.
[0026]
The absorbent layer 12 is an absorbent fiber layer such as pulp, or a high-absorbent resin contained in the absorbent fiber layer, or a non-woven fabric made of absorbent fibers and rayon polymer absorbers. Also good. Alternatively, absorbent paper may be used. Moreover, when the absorption layer 12 is adhere | attached or joined to the surface of the tray which installs a foodstuff, only the said liquid-permeable sheet 11 can be installed and used for the surface of a tray.
[0027]
In this drip absorbent sheet 10, drip that has oozed from livestock meat, fresh fish, fish meat, etc. installed on the liquid permeable sheet 11 is absorbed by the absorbent layer 12 through the liquid permeable passage 15. At this time, the liquid-permeable sheet 11 is opaque, and the opening 13 and the opening 14 are misaligned, so that the blood juice or the like absorbed by the absorption layer 12 cannot be seen from the I direction. Accordingly, the appearance of the product and the tray is improved.
[0028]
Moreover, since blood juice etc. are absorbed by the absorption layer 12 and isolate | separated from the food installed on the liquid-permeable sheet 11, the bacteria propagated to blood juice etc. do not adhere to food. Moreover, since air is always given to the food from the liquid permeable passage 15, there is also an effect of preventing discoloration of livestock meat and the like.
[0029]
FIG. 2 is a partial cross-sectional view showing a drip absorbent sheet for food 10A of Reference Example 2 of the present invention .
[0030]
The drip absorbent sheet 10A is obtained by stacking an opaque liquid-permeable sheet 11A such as white on the absorbent layer 12. The liquid permeable sheet 11A is formed with a large number of liquid permeable passages 15A, and the liquid permeable passages 15A are formed to bend in the thickness direction of the sheet. The opening 14A on the back surface of the sheet is not overlapped.
[0031]
The liquid permeable passage 15A may have a bent shape similar to that shown in FIG.
[0032]
FIG. 3 is a partial cross-sectional view showing a food drip absorbent sheet 10B of Reference Example 3 of the present invention .
[0033]
In this reference example , as described above, the liquid-permeable sheet 11B covering the absorption layer 12 is an opaque resin film such as white. A tube-like protrusion 20 protrudes from the resin film toward the back surface, and the protrusion 20 is bent toward the back surface. An opening 14B on the back surface side is formed at the tip of the bent projecting portion 20, and an opening 13B communicating with the inside of the projecting portion 20 is formed on the surface of the liquid-permeable sheet 11B. Since the tube-like protrusion 20 is bent, the opening 13B and the opening 14B are different in direction and are also out of position.
[0034]
The method of forming the protrusion 20 on the liquid permeable sheet 11B is to form a resin film opening 13B by, for example, piercing the resin film with a plurality of needles from above and from the periphery of the opening 13B to the back side. An elongated tube-like protrusion 20 is formed. The projecting portion 20 is bent, but the projecting portion 20 may be bent in advance, or the projecting portion 20 is bent by the pressure when it is laminated and partially bonded to the absorbent layer 12. Also good.
[0035]
In this reference example , the drip absorbed by the absorbent layer 12 is unlikely to return to the surface of the liquid-permeable sheet 11B, and the function of separating food and drip is excellent.
[0036]
4 is a partial perspective view showing a drip absorbent sheet for food 10D of Reference Example 4 of the present invention , and FIG. 5 is a cross-sectional view taken along the line V-V in FIG.
[0037]
In this drip absorbent sheet 10D, an opaque resin film liquid permeable sheet 11D is overlaid on the absorbent layer 12, and the liquid permeable sheet 10D has a protruding portion 21 embossed from the back surface to the surface. ing. A surface-side opening 13D is formed at a separation portion between the protruding portion 21 and the liquid-permeable sheet 10D. Further, a liquid permeable passage 15D is formed inside the protruding portion 21, and an opening 14D communicating with the liquid permeable passage 15D is formed on the back surface side.
[0038]
Since the opening 13D on the surface side is lateral, the opening 14D does not appear in the opening 13D when viewed from above.
[0039]
Moreover, since many protruding protrusions 21 are formed on the surface of the liquid-permeable sheet 11D, when food is placed, a gap is formed between the bottom surface of the food and the drip absorbent sheet 10D. Therefore, the drip absorbed by the absorbent layer 12 and the food can be completely separated, and since air is supplied to the gap between the surface of the liquid-permeable sheet 11D and the food, discoloration of the food can be prevented.
[0040]
FIG. 6 is a partial cross-sectional view of the drip absorbent sheet for food 10E according to the embodiment of the present invention.
[0041]
In the drip absorbent sheet 10E, the liquid-permeable sheet is composed of two sheets 11E and 11F. Both sheets 11E and 11F are polyolefin-based or polyester-based synthetic resin films, and at least one is an opaque sheet such as white. Preferably, the sheet 11E serving as the surface layer is transparent, and the sheet 11F serving as the back layer is opaque. By making the sheet 11E that is the surface layer transparent, the appearance is improved, and by making the sheet 11F that is the back layer opaque, the blood juice absorbed by the absorption layer 12 can be concealed.
[0042]
The sheet 11E is formed with a large number of liquid-permeable passages 15E penetrating perpendicularly to the thickness direction, and the sheet 11F is also formed with a large number of liquid-permeable passages 15F penetrating perpendicularly to the thickness direction. The liquid permeable passage 15E and the liquid permeable passage 15F are arranged so as not to overlap each other and are shifted in position. Also in this case, the opening 13E on the front surface of the sheet 11E and the opening 14F on the back surface of the sheet 11F are preferably shifted so as not to overlap at all, but the opening 13E is viewed from the direction perpendicular to the sheet. Sometimes, part of the opening 14F may be visible. However, it is preferable that the overlapping area of the opening 13E and the opening 14F is 1/2 or 1/4 of the opening area of the opening.
[0043]
Further, it is preferable that the openings 13E of the sheet 11E having a large number of openings and the openings 14F of the sheet 11F having the same number of openings do not overlap each other. The parts 13E and 14F may overlap. However, the number of overlapping openings with respect to the total number of openings is preferably 1/3 or less, and more preferably 1/5 or less.
[0044]
Moreover, it is preferable that a gap through which the liquid can permeate is formed between the liquid permeable passage 15E and the liquid permeable passage 15F at the joining boundary portion between the sheet 11E and the sheet 11F. Therefore, when the sheet 11E and the sheet 11F are bonded, it is preferable that the two sheets are bonded by interspersed with small dot-shaped bonding portions or heat-sealing portions.
[0045]
In the embodiment shown in FIG. 6, at least one of the liquid permeable passage 15E and the liquid permeable passage 15F may be as shown in FIGS.
[0046]
The reference examples shown in FIGS . 2 to 5 and the embodiment shown in FIG. 6 are absorbed by the fact that the openings of the liquid-permeable passage formed in the liquid-permeable sheet of the opaque sheet do not overlap on the front surface and the back surface. It can be absorbed by the layer 12 to exhibit a concealing effect such as blood juice.
[0047]
FIG. 7 is a partial sectional view of a drip absorbent sheet for food 10G according to Reference Example 5 of the present invention.
[0048]
In the drip absorbent sheet 10G, a concealing nonwoven fabric 23 is interposed between the absorbent layer 12 and the liquid-permeable sheet 11G. The liquid permeable sheet 11G is transparent or opaque, and a large number of liquid permeable passages 15G are opened in a direction orthogonal to the sheet surface. The opening 13G on the front surface side and the opening 14G on the back surface side of the liquid permeable passage 15G. Are open at overlapping positions.
[0049]
However, since the nonwoven fabric 23 is a liquid-permeable and opaque nonwoven fabric formed with fibers having low light transmittance, the drip absorbed by the absorbent layer 12 can be concealed by the nonwoven fabric 23.
[0050]
The nonwoven fabric 23 is formed of hydrophobic fibers and exhibits a liquid permeation function, but can exhibit an effect that the drip absorbed by the absorbent layer 12 does not return to the liquid permeation passage 15G.
[0051]
A drip absorbent sheet 10H shown in FIG. 8 is a modification of FIG. 7, in which a liquid permeable sheet 11G having a large number of liquid permeable passages 15G on the absorbent layer 12 and the opaque liquid permeable nonwoven fabric 23 are stacked. It has been.
[0052]
In the reference examples shown in FIGS. 7 and 8, the liquid permeable passage 15G may be as shown in FIGS.
[0053]
Further, when a sanitary napkin or a panty liner is formed with the liquid-permeable sheet and the absorbent layer, menstrual blood or body fluid absorbed by the absorbent layer is difficult to see from the surface.
[0054]
【The invention's effect】
As described above, the liquid-permeable sheet or absorbent article of the present invention is excellent in the concealing property of the liquid that has passed through the liquid-permeable sheet.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing a drip absorbent sheet of Reference Example 1 of the present invention ,
FIG. 2 is a partial sectional view showing a drip absorbent sheet of Reference Example 2 of the present invention ,
FIG. 3 is a partial sectional view showing a drip absorbent sheet of Reference Example 3 of the present invention ,
FIG. 4 is a perspective view showing a drip absorbent sheet of Reference Example 4 of the present invention .
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a partial sectional view showing a drip absorbent sheet according to an embodiment of the present invention;
FIG. 7 is a partial sectional view showing a drip absorbent sheet of Reference Example 5 of the present invention ,
8 is a partial sectional view showing a modification of FIG.
FIG. 9 is a partial external perspective view of a drip absorbent sheet;
FIG. 10 is a partial cross-sectional view showing a conventional drip liquid-absorbing sheet for food,
FIG. 11 is a partial cross-sectional view showing a conventional drip liquid absorbent sheet for food,

Claims (8)

In the liquid permeable sheet used on the absorption layer that absorbs the liquid,
  A plurality of sheets, at least one of which is opaque, are stacked, and each of the plurality of sheets has a large number of liquid-permeable passages. A liquid-permeable sheet, wherein the liquid-permeable sheets are arranged so as to be displaced from each other in the direction. The liquid-permeable sheet according to claim 1, wherein the liquid-permeable sheets are arranged so as to be shifted from each other so that openings of the sheets do not overlap at all. The liquid-permeable sheet according to claim 1, wherein a part of the opening of the sheet located below the opening is formed in the opening formed in the sheet. The liquid-permeable sheet according to claim 1, wherein any one of the plurality of openings provided in each sheet overlaps between both sheets. The liquid-permeable sheet according to any one of claims 1 to 4, wherein two sheets are provided, the surface layer sheet is transparent, and the back layer sheet is opaque. The liquid-permeable sheet according to any one of claims 1 to 5, wherein the sheets are joined together by adhesive portions or heat-sealing portions that are scattered in a dot shape. An absorbent article , wherein an absorbent layer that absorbs liquid is covered with the liquid-permeable sheet according to any one of claims 1 to 6.   The absorbent article according to claim 7, wherein the absorbent layer and the liquid-permeable sheet are joined at least partially.

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