JP2014217346A - Liquid-absorbing sheet and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid-absorbing sheet excellent in economical efficiency and environmental quality, and a method of manufacturing the same.SOLUTION: A liquid-absorbing sheet 1 comprises a liquid-absorbing layer 10, a front-side sheet 20, and a back-side sheet 30. The liquid-absorbing layer 10 includes a large number of granular liquid-absorbing treatment materials 40 and has liquid-absorbing performance. The liquid-absorbing treatment material 40 is formed in a flat shape by being pressed. The front-side sheet 20 and the back-side sheet 30 cover front and back sides of the liquid-absorbing layer 10, respectively. Both of the front-side sheet 20 and the back-side sheet 30 have water-permeable performance.

Description

  The present invention relates to a liquid-absorbing sheet that absorbs human and animal urine and other liquids, and a method for producing the same.

As a conventional liquid-absorbing sheet, for example, there is one described in Patent Document 1. As shown in FIG. 5, the liquid-absorbing sheet 90 described in the document includes a liquid-permeable surface layer 91, a liquid-impermeable back layer 92, and an absorbent layer 93 sandwiched between these layers. ing. The absorption layer 93 has a two-layer structure including an upper absorption layer 93a and a lower absorption layer 93b. Each of the upper absorbent layer 93a and the lower absorbent layer 93b is composed of crushed pulp 94 and superabsorbent resin 95.
JP 2005-006604 A

  Such a liquid-absorbing sheet is not repeatedly used after being washed, but is expected to be disposable. That is, when the water absorption capacity of the absorbent layer reaches its limit after a certain amount of use, or when the generation of malodor cannot be suppressed, the entire liquid absorbent sheet is replaced with a new one.

  However, even when the liquid absorbent sheet is exchanged in this way, the part actually used (the part that has absorbed the liquid) is often a part of the liquid absorbent sheet. Therefore, the rest will be thrown away even though it is still usable. This is unfavorable both economically and environmentally.

  This invention is made | formed in view of the said subject, and aims at providing the liquid-absorbing sheet excellent in economical efficiency and environmental performance, and its manufacturing method.

  A liquid-absorbing sheet according to the present invention includes a water-absorbing layer having water-absorbing performance, a surface sheet that covers the surface of the water-absorbing layer and has water-permeable performance, and a back sheet that covers the back surface of the water-absorbing layer and has water-permeable performance. The water-absorbing layer includes a large number of granular water-absorbing treatment materials that are flattened by being pressed.

  In this liquid absorbent sheet, the water absorption layer is configured to include a number of granular water absorption treatment materials. Thus, since the material which comprises a water absorption layer is shape | molded previously, even if it is a case where a liquid absorbing sheet is parted, the said material does not scatter or scatter easily. And this water absorption processing material is made into the flat shape by pressing. Thereby, since the connection between the water absorption treatment materials is strengthened, scattering and scattering of the material constituting the water absorption layer are further suppressed. For this reason, this liquid-absorbing sheet can separate only the used part and can continue use of the remaining part. Therefore, one liquid absorbent sheet can be used for a long time.

  Further, the method for producing a liquid-absorbing sheet according to the present invention includes a water-absorbing layer having water-absorbing performance, a surface sheet that covers the surface of the water-absorbing layer and having water-permeable performance, and a back surface that covers the back surface of the water-absorbing layer and has water-permeable performance. A liquid absorbent sheet comprising a sheet, the step of preparing a number of granular water absorbent treatment materials constituting the water absorbent layer, and the water absorbent treatment material sandwiched between the top sheet and the back sheet And a step of pressing the water-absorbing material while being sandwiched between the top sheet and the back sheet.

  In this manufacturing method, a water absorption layer is formed using a number of granular water absorption treatment materials. Since the water-absorbing layer is formed using the preformed material in this way, the material is less likely to scatter or scatter even when the liquid-absorbing sheet after production is divided. Moreover, the water absorption treatment material is pressed in a state of being sandwiched between the top sheet and the back sheet. Thereby, since the connection between the water absorption treatment materials is strengthened, scattering and scattering of the material constituting the water absorption layer are further suppressed. For this reason, according to this manufacturing method, the liquid absorption sheet which can cut off only a used part and can continue use of the remaining part is obtained. Therefore, one liquid absorbent sheet can be used for a long time.

  According to the present invention, a liquid-absorbing sheet excellent in economic efficiency and environmental performance is realized.

It is sectional drawing which shows one Embodiment of the liquid absorbing sheet by this invention. It is a schematic diagram which shows the water absorption processing material contained in the liquid absorbing sheet of FIG. It is a schematic diagram which shows the mode after the water absorption processing material of FIG. 2 was pressed. It is a top view of the surface sheet and back sheet in the liquid absorbing sheet of FIG. It is sectional drawing which shows the conventional liquid absorption sheet.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a cross-sectional view showing an embodiment of a liquid absorbent sheet according to the present invention. The liquid absorbent sheet 1 includes a water absorbent layer 10, a top sheet 20, and a back sheet 30. The water absorption layer 10 includes a large number of granular water absorption treatment materials 40 and has water absorption performance. In the present embodiment, the water absorption layer 10 has a single layer structure.

  FIG. 2 is a schematic diagram showing the water absorption treatment material 40. The water absorption treatment material 40 includes a granular core portion 42 and a coating layer portion 44. The granular core part 42 has water absorption performance. As a material (core material) constituting the granular core part 42, for example, papers, fibers, woods, plants, plastics, rubbers, or organic sludge materials can be used. Two or more of these may be used in combination.

  The granular core part 42 can be formed as follows, for example. That is, the core material is pulverized to a predetermined size by a crusher, and the pulverized core material is put into a mixer at a predetermined ratio and mixed. And after adding water, the said core material is extrusion-granulated with a granulator. Thereby, the granular core part 42 is obtained.

  The covering layer portion 44 covers the granular core portion 42. The covering layer portion 44 may cover the entire surface of the granular core portion 42 or may cover only a part thereof. The coating layer portion 44 has a function (blocking function) for adhering the water-absorbing treatment materials 40 that have absorbed liquid such as urine during use to form a block. As a material (coating material) constituting the coating layer portion 44, for example, a mixture of an adhesive material and paper powder can be used.

  The covering layer part 44 can be formed as follows, for example. That is, the coating material is adhered around the granular core portion 42 by spraying or spraying the coating material using a coating apparatus or the like. Thereby, the coating layer part 44 is obtained.

  As shown in FIG. 3, the water absorption treatment material 40 has a flat shape when pressed. In the present embodiment, the water absorption treatment material 40 is pressed while being sandwiched between the top sheet 20 and the back sheet 30. Such pressing is performed, for example, by embossing. In that case, the topsheet 20 and the backsheet 30 are formed with irregularities by embossing.

  The top sheet 20 and the back sheet 30 cover the front and back surfaces of the water absorption layer 10, respectively. Both the top sheet 20 and the back sheet 30 have water permeability. The material of the surface sheet 20 and the back surface sheet 30 should just have a water-permeable performance, for example, is a nonwoven fabric or paper. In the present embodiment, the top sheet 20 and the back sheet 30 are made of the same material and have the same size and shape. Further, the top sheet 20 and the back sheet 30 constitute the outermost surface and the outermost surface of the liquid absorbent sheet 1, respectively.

  As shown in FIG. 4, a tear line L <b> 1 for facilitating dividing the liquid absorbent sheet 1 into a plurality of parts is formed at the positions of the top sheet 20 and the back sheet 30 facing each other. The cut line L1 is a perforation, for example. In the present embodiment, three cut lines L1 are formed in parallel with the short sides of the top sheet 20 (back sheet 30), and two cut lines L1 are formed in parallel with the long sides.

  Then, an example of the manufacturing method of the liquid absorption sheet 1 is demonstrated as one Embodiment of the manufacturing method of the liquid absorption sheet by this invention. This manufacturing method includes a preparation process, a cut line forming process, a sandwiching process, and a pressing process.

  In the preparation step, a large number of granular water-absorbing treatment materials 40 are prepared. In this step, the water absorption treatment material 40 may be formed from scratch, or a previously formed water absorption treatment material 40 may be used.

  In the cut line forming step, a cut line L1 for easily dividing the liquid absorbent sheet 1 into a plurality of positions is formed on both the front sheet 20 and the back sheet 30 facing each other.

  In the sandwiching step, the water absorption treatment material 40 forms a state sandwiched between the top sheet 20 and the back sheet 30. For example, after the top sheet 20 and the back sheet 30 are bonded together in a bag shape, the water absorption treatment material 40 may be filled therein.

  In the pressing step, the water absorbing material 40 is pressed in a state of being sandwiched between the top sheet 20 and the back sheet 30. For the pressing, for example, a press machine having a hydraulic cylinder or an air cylinder can be used. Such pressing may be performed by embossing the top sheet 20 and the back sheet 30 with the water absorption treatment material 40 sandwiched therebetween.

The pressure applied in the pressing step is, for example, 500 kg / cm ² or more and 2 t / cm ² or less. Moreover, about the maximum space | interval d1 (refer FIG. 1) between the surface sheet 20 and the back surface sheet 30, it is preferable that the maximum space | interval after a press becomes 25% or more and 50% or less of the maximum space | interval before a press.

  The effect of this embodiment will be described. In the present embodiment, the water absorption layer 10 includes a large number of granular water absorption treatment materials 40. Thus, since the material which comprises the water absorption layer 10 is shape | molded previously, even if it is a case where the liquid absorption sheet 1 is parted, the said material does not scatter or scatter easily. Moreover, the water-absorbing treatment material 40 has a flat shape when pressed. Thereby, since the connection between the water absorption treatment materials 40 becomes strong, scattering / scattering of the material constituting the water absorption layer 10 is further suppressed. For this reason, this liquid-absorbing sheet 1 can cut off only the used part and continue using the remaining part. Accordingly, one liquid absorbent sheet 1 can be used for a long time. Therefore, the liquid-absorbing sheet 1 excellent in economic efficiency and environmental performance is realized.

  On the other hand, in the liquid absorbent sheet 90 described with reference to FIG. 5, the absorbent layer 93 is constituted by the pulp 94 and the highly water absorbent resin 95 that are just crushed. Therefore, when the liquid absorbing sheet 90 is divided into a plurality of pieces, the pulp 94 and the like are scattered and scattered from the cut. Therefore, the liquid absorbing sheet 90 is not suitable for cutting off only the used part and continuing the use of the remaining part.

  Further, the water absorption treatment material 40 is pressed in a state of being sandwiched between the top sheet 20 and the back sheet 30. By pressing the water absorption treatment material 40 through the topsheet 20 and the backsheet 30 in this way, it is possible to prevent the water absorption treatment material 40 from adhering to a press machine or the like.

  When the water absorption treatment material 40 is pressed by embossing, irregularities are formed on the topsheet 20 and the backsheet 30. Thereby, when the liquid absorbing sheet 1 is divided, the water absorbing treatment material 40 is likely to stay in the water absorbing layer 10, so that scattering and scattering of the material constituting the water absorbing layer 10 are further suppressed.

  A cut line L1 is formed on the top sheet 20 and the back sheet 30. The used part can be easily separated from the liquid absorbent sheet 1 by dividing along the cut line L1.

  The water absorption layer 10 has a single layer structure. For this reason, compared with the case where the water absorption layer 10 is a multilayer structure, while being able to cut away a used part from the liquid absorption sheet 1, the manufacturing cost of the liquid absorption sheet 1 can be suppressed low.

  The top sheet 20 and the back sheet 30 constitute the outermost surface and the outermost surface of the liquid-absorbing sheet 1, respectively. That is, only the top sheet 20 is provided on the surface of the water absorption layer 10, and only the back sheet 30 is provided on the back surface. By adopting such a simple configuration, a used part can be easily separated from the liquid absorbent sheet 1, and the manufacturing cost of the liquid absorbent sheet 1 can be kept low.

  The top sheet 20 and the back sheet 30 are made of the same material and have the same size and shape. Thereby, since it is not necessary to prepare the surface sheet 20 and the back surface sheet 30 separately, manufacture of the liquid absorption sheet 1 becomes easy. Moreover, it becomes possible to use the liquid-absorbing sheet 1 after manufacture without distinguishing the front and back.

  The liquid-absorbing sheet and the manufacturing method thereof according to the present invention are not limited to the above embodiment, and various modifications are possible. For example, in the said embodiment, the example in which the cut line L1 was formed in both the surface sheet 20 and the back surface sheet 30 was shown. However, the cutoff line L1 may be formed only on either the top sheet 20 or the back sheet 30. Moreover, it is not essential to form the cut line L1.

  In the said embodiment, the water absorption processing material 40 of the multilayer structure which consists of the granular core part 42 and the coating layer part 44 was illustrated. However, the water-absorbing treatment material 40 may have a single-layer structure including only the granular core portion 42.

DESCRIPTION OF SYMBOLS 1 Liquid absorbing sheet 10 Water absorbing layer 20 Top sheet 30 Back sheet 40 Water absorbing material 42 Granular core part 44 Covering layer part L1 Cut line

Claims (14)

A water absorption layer having water absorption performance;
A surface sheet covering the surface of the water-absorbing layer and having water permeability;
Covering the back surface of the water-absorbing layer, and having a water-permeable performance, and a back sheet,
The water-absorbing layer is configured to include a number of granular water-absorbing treatment materials that are flattened by being pressed. In the liquid-absorbing sheet according to claim 1,
The water-absorbing treatment material is a liquid-absorbing sheet that is pressed while being sandwiched between the top sheet and the back sheet. In the liquid-absorbing sheet according to claim 2,
The pressing is by embossing,
The liquid-absorbing sheet in which the embossing process is formed on the top sheet and the back sheet. In the liquid absorption sheet in any one of Claims 1 thru | or 3,
A liquid-absorbing sheet in which a cut line for easily dividing the liquid-absorbing sheet into a plurality of parts is formed on at least one of the top sheet and the back sheet. In the liquid-absorbing sheet according to claim 4,
The cutoff line is a liquid-absorbing sheet formed at a position where both the top sheet and the back sheet face each other. In the liquid absorption sheet in any one of Claims 1 thru | or 5,
The water absorbing layer is a liquid absorbing sheet having a single layer structure. In the liquid absorption sheet in any one of Claims 1 thru | or 6,
The top sheet is a liquid-absorbing sheet constituting the outermost surface of the liquid-absorbing sheet. In the liquid absorption sheet in any one of Claims 1 thru | or 7,
The back sheet is a liquid absorbing sheet constituting the outermost surface of the liquid absorbing sheet. It is a method for producing a liquid-absorbing sheet comprising a water-absorbing layer having water-absorbing performance, a surface sheet that covers the surface of the water-absorbing layer and has water-permeable performance, and a back sheet that covers the back surface of the water-absorbing layer and has water-permeable performance. And
Preparing a plurality of granular water-absorbing treatment materials constituting the water-absorbing layer; and
A sandwiching step in which the water-absorbing treatment material forms a state sandwiched between the top sheet and the back sheet;
A pressing step of pressing the water-absorbing treatment material in a state of being sandwiched between the top sheet and the back sheet;
A method for producing a liquid-absorbing sheet, comprising: In the manufacturing method of the liquid absorption sheet according to claim 9,
In the pressing step, with respect to the maximum distance between the top sheet and the back sheet, the water absorption treatment is performed such that the maximum distance after pressing is 25% or more and 50% or less of the maximum distance before pressing. A method for producing a liquid-absorbing sheet for pressing a material. In the manufacturing method of the liquid absorption sheet according to claim 9 or 10,
Wherein in the pressing step, at 500 kg / cm ² or more 2t / cm ² pressure below, the manufacturing method of the liquid-absorbing sheet for pressing the water treatment material. In the manufacturing method of the liquid absorption sheet according to any one of claims 9 to 11,
In the pressing step, a method for producing a liquid-absorbing sheet that presses the water-absorbing treatment material by embossing the top sheet and the back sheet with the water-absorbing treatment material sandwiched therebetween. In the manufacturing method of the liquid absorption sheet according to any one of claims 9 to 12,
A method for producing a liquid absorbent sheet, comprising a cut line forming step for forming a cut line for easily dividing the liquid absorbent sheet into a plurality of pieces on at least one of the top sheet and the back sheet. In the manufacturing method of the liquid absorption sheet according to claim 13,
In the cut line forming step, the liquid absorbing sheet is produced by forming the cut line at a position where both the top sheet and the back sheet face each other.

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