JP2008044653A - Composite water absorbing mat for food - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water absorbing mat for foods which causes a water sheet to smoothly absorb a colored liquid, such as blood leaking from a food, makes the colored liquid hardly visible from the consumer side, contains no chemical binder to prevent the production of a residual monomer or a trace of formalin, and is safe to the human body and advantageous to the global environment. <P>SOLUTION: The water absorbing mat for foods is made by laminating together a polyolefin sheet of 0.1 to 1 mm thick having a number of micropores and a water absorbing sheet composed of a thermoadhesive composite fiber and a pulp-based air-laid nonwoven fabric. The micropores of the polyolefin sheet have an opening diameter B on a face in contact with the water absorbing sheet and an opening diameter A on a face in contact with a food, and the opening diameter B is larger than the opening diameter A. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water absorbent mat for foods used as a rug in a dish when a fillet such as meat or fish is placed in a resin dish (tray) and packaged with a polymer film or the like.

Conventional water-absorbing mats for food are either single-layered materials composed only of non-woven fabric made of hydrophilic fibers such as pulp, or plastic sheets with many holes on the surface of such liquid-absorbing sheets. An integrated two-layer structure is known.
For example, Patent Document 1 (Japanese Utility Model Publication No. 7-492) discloses a water-absorbing mat that can conceal a colored liquid absorbed by an absorbent sheet by using a synthetic resin film that has been cut by embossing as a top sheet. Has been proposed. However, with this water absorbent mat, the cuts due to embossing are only minute, and when continuously processed, the state of the cuts tends to fluctuate, and the permeation / absorption capacity of food drip is somewhat low. Absent.

  Further, Patent Document 2 (Japanese Patent No. 3160188) uses a slit blade having a specific blade angle to improve the drip absorption rate by using an opaque sheet provided with a linear slit as a top sheet. And the drip absorption sheet | seat with an absorption groove which also ensured concealment property is proposed. However, when a large number of linear slits (cuts) are provided, it is natural that the strength of the sheet is significantly weakened, so that the interval between the cuts must be widened and the length thereof must be reduced. Accordingly, the transmission / absorption capacity of the drip is not sufficient.

Further, Patent Document 3 (Japanese Patent No. 2841282) discloses a synthetic resin net and a sheet-shaped absorbent body having a mortar-shaped hole having a large opening on the surface side and a small opening on the absorbent sheet side. Discloses a tray mat in which layers are integrated. However, since this mat has a large opening on the surface side, the colored liquid (blood, etc.) absorbed by the sheet-like absorber can be easily seen from the opening, and the commercial value is inferior.
In addition, these prior arts include descriptions of nonwoven fabrics, spunlace nonwoven fabrics, pulp nonwoven fabrics, and the like as the material of the absorbent sheet. There is no description or suggestion.
No. 7-492 Japanese Patent No. 3160188 Japanese Patent No. 2841282

  The present invention can smoothly absorb colored liquids such as blood generated by foods into the absorbent sheet, and the colored liquids are difficult to see from the consumer side, and since no chemical binder is present, the generation of residual monomers and trace formalin is also possible. The object is to provide an absorbent mat for food that is safe for the human body and friendly to the global environment.

In the present invention, a polyolefin sheet having a large number of minute holes and a thickness of 0.1 to 1 mm, and a water-absorbing sheet composed of an air-laid nonwoven fabric mainly composed of a heat-adhesive conjugate fiber and pulp are laminated and integrated. In the composite water absorbent mat for foods, the hole of the polyolefin-based sheet is larger in the opening diameter B of the surface in contact with the water absorbent sheet than the opening diameter A of the surface in contact with the food. The present invention relates to a composite water absorbent mat for food.
Here, the number of the holes is 50 to 200 / cm ² , the diameter A of the surface in contact with the food is 0.2 to 1 mm, and the diameter B of the surface in contact with the water absorbent sheet is A × 1.2 to 2 times. Preferably there is.
Moreover, the hole of a polyolefin-type sheet | seat may be mixed with the different hole diameter.
Furthermore, the composite water absorbent mat for food of the present invention comprises a front and back layer having a weight ratio of 100 to 70/0 to 30 and a basis weight of 5 to 15 g / m ² , and a thermoadhesive conjugate fiber. And a weight ratio of 20 to 50/80 to 50 and a basis weight of 20 to 150 g / m ² is preferably made of an airlaid nonwoven fabric in which three layers of inner layers are laminated and integrated.

  The composite water absorbent mat for food according to the present invention can smoothly absorb colored liquid such as blood generated by food into the absorbent sheet, and the colored liquid is difficult to be seen from the consumer side, and further, there is no chemical binder, so that residual monomer There is no generation of traces of formalin, and it is safe for the human body and friendly to the global environment. In addition, when the hole diameter of the polyolefin sheet is smaller than the hole diameter of the surface in contact with the water absorbent sheet, the opening of the polyolefin sheet in which colored liquid such as blood absorbed by the absorption sheet is perforated is opened. It is hygienic because it is hard to see from the hole, has a clean feeling, increases the willingness to purchase, and has little liquid reversal.

Polyolefin-based sheet As a polymer constituting the polyolefin-based sheet, a polyolefin-based resin such as polypropylene and polyethylene is preferable from the viewpoint of practicality such as water resistance, moldability, and cost. Additives such as a deodorant, an antibacterial agent, a colorant, and a hydrophilic agent may be blended with the polyolefin resin. In particular, titanium dioxide is preferable as an additive because the film becomes opaque and has high concealability and it is difficult to visually recognize the drip absorbed from the surface side.
The thickness of the polyolefin-based sheet is 0.1 to 1 mm, preferably 0.15 to 0.8 mm. If it is less than 0.1 mm, it is too thin and it is difficult to provide different holes on the front and back surfaces, and food is likely to come into direct contact with the liquid absorbed by the absorbent sheet, which is unsanitary. Moreover, if it is too thin, it is too soft and the handleability deteriorates. On the other hand, when the thickness exceeds 1 mm, the liquid permeation rate is slow because of being too thick, and the liquid absorption performance is adversely affected.

The polyolefin-based sheet used in the present invention has a large number of minute holes. This hole can be appropriately drilled by means such as a mechanical needle method, a hot needle method, a hot air blowing method from a fine hole, etc., and can be arbitrarily set according to the required hole size and hole diameter difference. You can choose.
Here, the shape of the hole may be any of a circle, an ellipse, a quadrangle (rectangle, regular square), and a triangle.
In addition, the postscript opening diameter in this invention shall represent with the average value of the largest internal dimension among the arbitrary internal dimensions of a hole, and the minimum internal dimension.
The hole needs to have a larger opening diameter B on the surface in contact with the water absorbent sheet than the opening diameter A on the surface in contact with the food. For example, the opening diameter on the surface side is 0.2 to 1 mm, preferably 0.3 to 0.8 mm, and is smaller than the opening diameter B on the surface in contact with the water-absorbing sheet, so that the concealability of absorbed blood and the like is high. Get better. When the opening diameter on the surface side is too small, the liquid absorption performance is deteriorated. On the other hand, when it is too large, the concealability is deteriorated, which is not preferable.
Here, the number of holes is 50 to 200 holes / cm ² , preferably 70 to 160 holes / cm ² . If it is less than 50 pieces / cm ² , the drip permeability is poor. On the other hand, if it exceeds 200 pieces / cm ² , the strength of the film becomes weak and the concealing property is also deteriorated.
Moreover, the aperture diameter B of the surface which contacts a water absorbing sheet is Ax1.2-2 times, Preferably it is Ax1.3-1.8 times. If it is less than 1.2 times, the concealing property is lacking. On the other hand, if it is more than 2 times, the boundary part between adjacent holes becomes too small and it is difficult to produce, which is not practical.

  In addition, as long as the polyolefin-type sheet | seat used for this invention is a range which satisfy | fills said conditions, the thing of a different hole diameter may be mixed. In this case, each hole diameter needs to satisfy B = 1.2A to 2A.

Such a polyolefin-based sheet having a large number of minute holes can be processed, for example, by passing a normal polyolefin-based sheet between a hot needle roll and a receiving roll. The temperature of the hot needle roll is preferably 180 to 350 ° C. The optimum temperature of the hot needle roll needs to be changed depending on the material and processing temperature. For example, when processing a polypropylene sheet, if it is less than 180 ° C., poor perforation or poor adhesion occurs, and if it exceeds 350 ° C., it causes troubles such as fusion to a hot roll. More preferably, it is 220-330 degreeC.
The gap between the hot needle roll and the receiving roll is preferably 0.1 to 2 mm. If this distance is less than 0.1 mm, the bulk is crushed and the water retention performance is reduced. On the other hand, if it is more than 2 mm, it may cause poor hole formation or poor adhesion. Preferably it is 0.2-1.5 mm.

Water-absorbing sheet In the composite water-absorbing mat for food of the present invention, the water-absorbing sheet as a base material is composed of an airlaid nonwoven fabric mainly composed of heat-adhesive conjugate fibers and pulp.

  Among these, as the heat-adhesive conjugate fiber, a core-sheath type or an eccentric side-by-side type conjugate fiber is preferable. Examples of the polymer constituting the sheath or the outer periphery of the fiber include polyethylene and polypropylene. As the polymer constituting the core component or the fiber inner layer part, a polymer having a melting point higher than that of the sheath and not changing at the heat bonding treatment temperature is preferable. Examples of such combinations include polyethylene / polypropylene, polyethylene / polyester, polypropylene / polyester, and the like. These polymers may be modified as long as they do not impair the action / effect of the present invention. Furthermore, it may be a fibrillar fiber. For example, SWP of Mitsui Chemicals, Inc. is mentioned.

  When the heat-adhesive conjugate fiber is thin, the number of constituent fibers increases, so that the number of falling fibers is reduced. The preferred fineness is 0.5 dt to 50 dt, and more preferably 0.8 dt to 30 dt. If it exceeds 50 dt, the drop of the pulp cannot be suppressed, which is not preferable. On the other hand, if it is less than 0.5 dt, the productivity of the nonwoven fabric is lacking, which is not practical.

  The length of the heat-adhesive conjugate fiber is preferably 1 to 15 mm. If the fibers are short, the mixability with the pulp is improved, and a more uniform nonwoven fabric tends to be obtained. However, if the fiber is less than 1 mm, it approaches a powder form, and it is difficult to form a network structure due to interfiber bonding, and the pulp cannot be prevented from falling off. This is not preferable because the strength of the resin becomes low and the utility is lacking. On the other hand, if the length is longer than 15 mm, the strength of the nonwoven fabric increases, but the fibers tend to get entangled during pneumatic transportation of the fibers during the production of the nonwoven fabric, which increases the fiber lump defects, which is not preferable. Particularly preferred is 3 to 10 mm.

  On the other hand, the pulp constituting the water absorbing sheet is preferably pulverized pulp having a length of 0.2 mm to 5 mm. Pulp is a material for securing water absorption, and is most preferable from the viewpoints of performance and price. In addition to pulp, natural fibers such as cotton and hemp, and synthetic fibers such as rayon may be contained in an amount of less than 50% by weight. If it is 50% by weight or more, the water absorption performance deteriorates and is not practical.

  In the whole water-absorbent sheet of the present invention, the weight ratio of the heat-adhesive conjugate fiber and the pulp is 20-50 / 80-50, preferably 25-45 / 75-55. If the heat-adhesive conjugate fiber is less than 20% by weight, it is difficult to fix the pulp in the water-absorbent sheet. On the other hand, if it exceeds 80% by weight, the pulp content is relatively small and the water absorption is deteriorated. In addition, the cost is increased, which is not practical and not preferable.

As the above-described composite water-absorbent mat for food of the present invention, the weight ratio of the heat-adhesive conjugate fiber and the pulp is 100 to 70/0 to 30, and the basis weight is 5 to 15 g / m ^2. An airlaid nonwoven fabric in which three layers of inner layers having a weight ratio of fiber to pulp of 20 to 50/80 to 50 and a basis weight of 20 to 150 g / m ² are laminated and integrated is preferable.

Here, on the front and back layers, in addition to the above heat-adhesive conjugate fibers and pulp, recycled fibers such as rayon, semi-synthetic fibers such as acetate, synthetic fibers such as polyester, polypropylene, polyamide and vinylon, cotton, hemp Other fibers such as natural fibers may be included. In this case, the ratio of the heat-adhesive conjugate fiber in the front and back layers is preferably 70 to 100% by weight, more preferably 85 to 100% by weight. If the amount is less than 70% by weight, the possibility of pulp falling off increases, and the effect of suppressing the pulp falling off of the inner layer portion is reduced, and the wet strength is lowered, resulting in practical problems.
These fibers forming the front and back layers are thermally bonded, and the pulp is fixed by a network structure formed by the interfiber bonding. The basis weight is preferably 5 to 15 g / m ² , more preferably 6 to 14 g / m ² . If it is less than 5 g / m ² , the amount of the heat-adhesive conjugate fiber having water resistance and the number of bonding points between the fibers are small, so that not only sufficient wet strength cannot be secured, but also adhesion failure or increase in fallen fibers is caused. Easy to invite. On the other hand, if it exceeds 15 g / m ² , the water-resistant heat-bonding layer becomes too thick, moisture absorption into the inner layer becomes insufficient, and the cost becomes uneconomical. As the basis weight increases, the strength increases but the water absorption decreases. However, within the scope of the present invention, it is possible to obtain a composite water-absorbing mat for foods that has sufficient water absorption and is strong even when wet, and does not fall off fibers.

On the other hand, in the inner layer, the heat-adhesive conjugate fiber and the pulp are integrated by heat bonding. The heat-adhesive conjugate fiber may be the same as or different from the front and back layers. As the pulp, pulverized pulp having a length of 0.2 mm to 5 mm is preferable.
The mixing ratio of the heat-adhesive conjugate fiber / pulp in the inner layer is preferably 20-50 / 80-50% by weight, more preferably 25-45 / 75-55% by weight of the heat-adhesive conjugate fiber / pulp. . When the ratio of the pulp exceeds 80% by weight, the strength becomes weak and delamination occurs, and the strength when wet is lowered. On the other hand, if it is less than 50% by weight, the drip absorbability deteriorates.

  As the ratio of the heat-adhesive conjugate fiber increases, the strength increases but the water absorption decreases. Accordingly, it has been difficult to achieve both sufficient strength, particularly when wet, and water absorption. These compatibility is very important for a water absorbent mat for food. For the first time within the range of the ratio of the present invention, it is possible to obtain a water-absorbing mat for foods that retains sufficient water absorption and has sufficient strength even when wet. Further, since the ratio of the heat-adhesive conjugate fiber is large, the bulk is small and it can be thinned.

In the inner layer, the heat-adhesive conjugate fibers and the heat-adhesive conjugate fibers and the pulp are thermally bonded. The basis weight of this inner layer is preferably 20 to 150 g / m ² , more preferably 30 to 120 g / m ² . If the amount is less than 20 g / m ² , the amount of the pulp is too small and the water absorption is insufficient. On the other hand, if the amount exceeds 150 g / m ² , an excessive absorption amount is not suitable for this application.
In addition, the water-absorbent sheet having such a three-layer structure is integrated between the front and back surfaces and the inner layer by heat bonding between the heat-adhesive conjugate fibers, and further has sufficient heat sealability.

  The water-absorbent sheet of the present invention may be manufactured by any method, but a nonwoven fabric by an airlaid method is preferable. The nonwoven fabric produced by the airlaid method is preferred because the fibers forming the nonwoven fabric are randomly three-dimensionally oriented in the longitudinal direction, width direction and thickness direction of the nonwoven fabric.

Here, the nonwoven fabric by the airlaid method can be obtained as follows.
A fiber mainly composed of a predetermined amount of defibrated heat-adhesive conjugate fiber is conveyed while being uniformly dispersed in an air stream, and the fiber blown out from a screen having pores provided in a discharge part is installed in the lower part. The fiber is deposited on a net while dropping into a metal or plastic net and suctioning air at the bottom of the net. Next, the mixture of the heat-adhesive conjugate fiber and the pulp is similarly deposited on the deposition sheet. Further, fibers mainly composed of heat-adhesive conjugate fibers are deposited on these sheets.
Next, the whole is heat-treated at a temperature at which this heat-adhesive conjugate fiber exhibits its adhesive effect sufficiently, and a water-absorbing sheet made of the dry pulp nonwoven fabric of the present invention can be obtained. In order to fully exhibit the adhesive effect, heat treatment at a temperature 15 to 40 ° C. higher than the melting point of the adhesive component of the heat-adhesive conjugate fiber is necessary.

Thus, the nonwoven fabric manufactured by the airlaid method can three-dimensionally orient the fibers at random in the flow direction, width direction and thickness direction of the nonwoven fabric. And since these are thermally bonded, delamination does not occur. Moreover, since the non-woven fabric produced by the airlaid method has good uniformity, there is less variation in performance.
If necessary, further calendar processing and embossing processing can be performed.

The water-absorbent sheet made of the dry nonwoven fabric used in the present invention has a vertical to horizontal strength ratio of 0.7 to 1.1, preferably 0.75 to 1.05, both when dry and when wet. It is. If either one of the strengths is low, practical problems are likely to occur.
Moreover, the ratio of the tensile strength at the time of drying and wet is usually 0.6 to 1.1, preferably 0.7 to 1.1. Those less than 0.6 are non-woven fabrics whose strength when wet is greatly reduced compared to when dry, that is, weakened when wet, and deviates from the intention of the present invention, causing problems in practical use. Further, when wet, the strength increases due to the surface tension between fibers due to the presence of moisture and may exceed 1, which is also within the scope of the present invention, but unless there is another means of binding in the presence of any moisture. It is not normal to exceed 1.1.

  The water-absorbent sheet made of the dry nonwoven fabric used in the present invention needs to have an appropriate water absorbency, and the absorbency of water is usually 5 to 20 g / g, preferably 6 to 18 g / g. If it is less than 5 g / g, the absorbability is insufficient. On the other hand, if it exceeds 20 g / g, water cannot be absorbed unless special fibers such as a polymer water-absorbing polymer are used.

The overall basis weight of the water-absorbing sheet (including single-layer products and three-layer products) made of the above dry nonwoven fabric is usually 30 to 160 g / m ² , preferably 40 to 150 g / m ² . If it is less than 30 g / m ² , the amount of water to be retained is insufficient, while if it exceeds 160 g / m ² , the amount of water to be retained is excessive as a food absorbent mat.
In the present invention, the front and back layers on both sides of the dry pulp nonwoven fabric are mainly composed of the heat-adhesive conjugate fiber as described above. This is because the occurrence of falling fibers is prevented on the opposite surface.

Multilayer integration of polyolefin sheet and water absorbent sheet The composite water absorbent mat for food of the present invention is laminated in a two-layer structure by laminating the above polyolefin sheet on a water absorbent sheet made of dry nonwoven fabric with the surface having a large opening diameter. It is integrated. In order to integrate them, a known method such as a method using hot melt, hot-pressure embossing, or heat-adhesive resin powder can be applied. In order not to impede the performance of the absorbent sheet, the hot melt method is preferable. In this case, the hot melt resin can be selected from polyolefin, polyvinyl acetate, and synthetic rubber. The application amount of the adhesive is preferably 1 to 20 g / m ² , more preferably ² to 15 g / m ² .

  The composite water-absorbing mat for food of the present invention thus obtained is excellent not only in strength at the time of drying but also at the time of wetness only by point bonding with heat bonding or hot melt adhesive. ing. Also, the water absorption is good. Furthermore, since the composite water absorbent mat for food of the present invention does not use so-called chemical binders such as water-based emulsions and suspensions, there is no generation of residual emulsifiers, residual monomers, trace amounts of formalin due to cross-linking, and there are also safety and hygiene problems. Absent.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not necessarily limited to these examples, and the present invention includes any design changes that do not depart from the spirit of the present invention. It is.

Example 1
A polyethylene film having a perforated polyolefin sheet thickness of 0.35 mm was used. To this film, a hot needle method (a taper needle was used to pierce from the back side of the film) had an aperture diameter A (front surface) of 0.4 mm, an aperture diameter B (back surface) of 1 mm, and a number of holes of 110 / cm. ^{The one having 2} circular holes was used.

Fabrication of dry nonwoven fabric (water-absorbent sheet) As heat-adhesive conjugate fibers for the front and back layers, core-sheath conjugate fiber with a polyethylene terephthalate core and polyethylene sheath (Teijin Fibers Ltd., 2.2 dt, length 5 mm) and wood crushing Pulp (Weyerhaeuser, NB416) mixed at a ratio of 90% by weight and 10% by weight, respectively, using a basis weight of 8 g / m ² , and the inner layer part is a composite fiber with a core of polypropylene and a sheath of polyethylene (ES Fiber Vision Co., Ltd., ESC, 1.7 dt, length 5 mm) and wood pulverized pulp (Weyerhaeuser, NB416) were mixed at a ratio of 25% by weight and 75% by weight, respectively. with 64 g / ^{m 2,} these laminated and integrated, due air-laying method, 138 ° C. heating together with heat oven It was.
The total basis weight was 80 g / m ² and the thickness was 1.2 mm.

Integration of polyolefin sheet and water absorbent sheet Morescommelt TN715, which is a polyolefin hot melt adhesive manufactured by Matsumura Oil Research Co., Ltd., was melted at 200 ° C. and sprayed from a number of nozzles onto the water absorbent sheet together with compressed air. The application amount was 4 g / m ² . Immediately, a perforated polyolefin sheet was stacked and integrated to prepare a composite water absorbent mat. A schematic view of this composite water absorbent mat is shown in FIG.

Performance of composite water absorbent mat for food The resulting water absorbent mat has a total weight of 84 g / m ² , a thickness of 1.25 mm, and a tensile strength (dry) of MD / CD = 4.1 / 3.9 kgf / 25 mm, tensile The strength (humidity) is MD / CD = 3.9 / 3.7 kgf / 25 mm, the liquid absorption speed is 1 to 3 seconds, the liquid retention amount (saline) is 1,015 g / m ² per area, and the weight is 12. 1 g / g and concealability (WB value) were 57.4.

The test methods are as follows.
(1) Thickness:
Conforms to JIS-L-1913 “General Short Fiber Nonwoven Fabric Test Method” 6.1.2 Method A. However, measuring terminal 30mmφ, load 2.75g / cm ² (measuring instrument; Ozaki FFA-8 type)
(2) Tensile strength:
Conforms to JIS-L-1913 “Test method for general short fiber nonwoven fabric” 6.3.1. However, the sample width is 25 mm, the chuck is 100 mm, and the tensile speed is 300 mm / min.
As for the tensile strength when wet, the test piece immediately after the treatment (immersion) under the same condition as that for measuring the liquid retention amount was subjected to a strength test.
(3) Liquid absorption speed:
1 cc of physiological saline was dropped on a horizontally placed test piece, and the time (seconds) until the rise of the droplet on the perforated plastic sheet disappeared was measured.
(4) Liquid retention amount (g / g, g / m ² ):
A 10 cm × 10 cm test piece weighed in advance was immersed in physiological saline at 20 ° C. for 1 minute, then placed on a 45 ° inclined glass plate for 1 minute, and then weighed again and absorbed. The weight of water was divided by the weight of the test piece and displayed as g / g. Further, this was weighted and displayed as g / m ² .
(5) Concealment:
Procedure-1: Congo red 0.5% was added to the physiological saline as a coloring agent, and 2 cc of this liquid was dropped from above the test piece and absorbed by the absorbent sheet.
Procedure-2: The whiteness was measured from the side of the perforated plastic sheet, and used as a measure of concealment. The instrument used was Nippon Denshoku Co., Ltd. color meter ZE2000, and was expressed in whiteness (WB value).

Examples 2-3 and Comparative Examples 1-3
The water-absorbing sheet was the same as that used in Example 1, and a water-absorbing mat having the configuration shown in Table 1 was prepared to evaluate the concealability. The results are shown in Table 1.

  The composite water absorbent mat for food of the present invention has high strength even when wet, good water absorption, and excellent concealability as shown in Table 1.

  The composite water absorbent mat for food of the present invention is excellent in strength and water absorbency, has no harmful volatile components such as formalin, and has excellent concealment of drip such as blood, and is suitable as a drip sheet for food. Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the composite water absorbing mat for foodstuffs (Example 1) which concerns on this invention, (A) is a cross-sectional schematic diagram, (B) is the front view of the side which touches the food of the polyolefin-type sheet | seat used for this mat, (C ) Is a front view of the side of the sheet in contact with the water absorbent sheet.

Claims (4)

  A food product comprising a polyolefin sheet having a large number of minute holes and a thickness of 0.1 to 1 mm, and a water-absorbing sheet made of an airlaid nonwoven fabric mainly composed of heat-adhesive conjugate fibers and pulp, which are laminated and integrated. A composite water absorbent mat for foods, wherein the pores of the polyolefin-based sheet are larger in the aperture diameter B of the surface in contact with the water absorbent sheet than the aperture diameter A of the surface in contact with the food mat. 2. The number of holes is 50 to 200 / cm ² , the diameter A of the surface in contact with the food is 0.2 to 1 mm, and the diameter B of the surface in contact with the water absorbent sheet is A × 1.2 to 2 times. The composite water absorbent mat for food as described.   The composite water absorbent mat for food according to claim 1 or 2, wherein the pores of the polyolefin sheet are mixed with different pore sizes. The water-absorbent sheet has front and back layers having a weight ratio of 100 to 70/0 to 30 and a basis weight of 5 to 15 g / m ² , and a weight ratio of the heat adhesive composite fiber and the pulp of 20 to 20 The composite water absorbent mat for food according to any one of claims 1 to 3, comprising an airlaid nonwoven fabric in which three layers of inner layers having a weight of 50/80 to 50 and a basis weight of 20 to 150 g / m ² are laminated and integrated.

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