JP5840555B2 - Drip sheet - Google Patents

Description

  The present invention relates to a drip sheet suitable for absorbing a drip that exudes from meat or the like.

  2. Description of the Related Art Conventionally, drip sheets for absorbing drip oozing out from small pieces of fish fillets or beef placed in a tray made of polystyrene foam or the like are generally known. For example, Patent Document 1 discloses a drip sheet having a two-layer structure in which a non-liquid-absorbing plastic sheet whose upper layer has a plurality of openings and a lower layer made of a liquid-absorbing fiber nonwoven fabric.

JP 2003-267455 A

  According to the drip sheet disclosed in Patent Document 1, the drip oozed from the fish meat or the like can be quickly moved to the lower layer through a plurality of openings formed in the upper plastic sheet, and the lower layer liquid absorption Drip can be absorbed and retained by the non-woven fiber nonwoven fabric.

  However, since the upper layer is formed from a non-liquid-absorbing plastic sheet and it is necessary to absorb the drip only with the lower layer fiber nonwoven fabric, the fiber nonwoven fabric having a required thickness for absorbing a certain amount of drip It is necessary to use a sheet. In such a case, the entire sheet has a required thickness, and the balance of the fish meat or the like disposed on the sheet in the tray is deteriorated, which is not visually preferable. On the other hand, when the thickness dimension of the lower plastic sheet is reduced, the thickness dimension of the opening is reduced, so that the drip absorbed in the lower layer is likely to be rewet (returned).

  An object of the present invention is to improve a conventional drip sheet, and to provide a drip sheet that is relatively thin, has a relatively small amount of rewet, and does not excessively absorb moisture in food.

  In order to solve the above problems, the present invention provides a liquid-permeable and liquid-absorbing upper layer sheet having an upper surface and a lower surface and a thickness direction, and defining the upper surface, and an absorbent material defining the lower surface. The present invention relates to a drip sheet including a liquid and liquid retaining lower layer sheet.

In the drip sheet according to the present invention, the upper layer sheet is formed of a fiber nonwoven fabric containing at least hydrophobic fibers, the lower layer sheet is formed of a fiber nonwoven fabric containing at least hydrophilic fibers, and the average pore diameter of the upper layer sheet is greatly than the average pore size of the lower layer sheet, the upper layer sheet is formed from an air-through fibrous nonwoven fabric containing heat-fusible fibers, a first layer defining said top surface, located on the lower surface of the first layer, wherein A second layer facing the lower layer sheet, and the fiber gap of the first layer is smaller than the fiber gap of the second layer in a cross-sectional view of the upper layer sheet .

  The drip sheet according to the present invention includes an upper layer sheet that forms an upper surface and a lower layer sheet that forms a lower surface, and includes at least hydrophobic fibers as well as a lower layer sheet formed from a fiber nonwoven fabric including at least hydrophilic fibers. Since the upper layer sheet formed from the fiber nonwoven fabric also has liquid absorbency, the required drip can be absorbed by the entire sheet and the entire sheet can be formed relatively thin. Moreover, since the average pore diameter of the upper layer sheet is larger than the average pore diameter of the lower layer sheet, the upper layer sheet itself can hold a required amount of drip without excessively absorbing moisture from the food.

The perspective view of a drip sheet. II-II sectional view taken on the line of FIG. The elements on larger scale enclosed with the III line of FIG. The figure which shows an example of the usage example of a drip sheet.

  1 to 3, the drip sheet 10 has a thickness direction Z and includes an upper surface 11, a lower surface 12, an upper layer sheet 13, and a lower layer sheet 14. The upper layer sheet 13 and the lower layer sheet 14 are fixed to each other via an adhesive portion 15 formed from a known adhesive means such as a hot melt adhesive.

  The upper layer sheet 13 can be formed from a known fiber nonwoven fabric such as an air-through fiber nonwoven fabric, a spunlace fiber nonwoven fabric, or a spunbond fiber nonwoven fabric. The air-through fiber nonwoven fabric, which is one of the materials of the upper layer sheet 13, is a fiber nonwoven fabric produced by a known air-through method. The air-through method supports a fiber web such as a card web with a net and generates hot air from above. This is a method of forming a sheet by partially heat-sealing the intersections of the constituent fibers by spraying. The air-through fiber nonwoven fabric formed by such a method has a spray surface on which fibers are relatively sparse and a net support surface on which fibers are relatively dense. In this invention, it arrange | positions so that the upper surface of the upper layer sheet | seat 13 may become a net support surface, and a lower surface (opposite surface with the lower layer sheet | seat 14) may become a spraying surface. The upper layer sheet 13 may be formed from a known fiber nonwoven fabric such as a spunbond fiber nonwoven fabric or a spunlace fiber nonwoven fabric as long as the effects of the present invention described later are exhibited.

  As the fiber 18 constituting the air-through fiber nonwoven fabric of the upper layer sheet 13, a hydrophobic thermoplastic synthetic resin can be used, for example, polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), and these. A core-sheath type composite fiber can be used. The composite fiber has a fineness of 1 to 6 dtex, a fiber length of 30 to 70 mm, and a thermoplastic resin that forms a sheath part has a lower melting temperature than a thermoplastic synthetic resin that forms a core part. . Moreover, you may use the thing with a higher elastic modulus than the thermoplastic synthetic resin which forms a sheath part for the thermoplastic synthetic resin which forms a core part, and may make the rigidity of the upper layer sheet 13 whole high. Examples of the core-sheath type composite fiber include polyethylene and polypropylene, polyethylene and polyester, polypropylene and polyester, and a combination of polyethylene terephthalate and polyethylene. As long as the effects described later of the present invention are exhibited, the upper layer sheet 13 may be formed from an air-through fiber nonwoven fabric having a structure of two or more layers, or ones having different finenesses of fibers constituting each layer may be used. Further, the upper layer sheet 13 may partially include hydrophilic fibers such as rayon in order to improve the liquid absorbency.

  The lower layer sheet 14 is a liquid-absorbing and liquid-retaining airlaid fiber nonwoven fabric, and pulp fibers 19 can be used as a raw material, and plant fibers and synthetic fibers such as hardwoods and conifers can be combined. However, a softwood pulp fiber is preferable in view of the tensile strength of the lower layer sheet 14. In addition, when fibers other than pulp fibers are used, hydrophilic enhancement treatment may be performed in order to improve the absorption performance of the lower layer sheet 14.

The adhesive portion 15 is formed by applying a hot melt adhesive having a mass of about 2.0 g / m ² to the lower surface of the upper layer sheet 13 and / or the upper surface of the lower layer sheet 14 in the form of dots. The hot melt adhesive forming the bonding portion 15 may be applied in various known patterns such as a straight shape, a wavy shape, a spiral shape, and a lattice shape in addition to the dotted shape. However, in order not to hinder the movement of the drip from the upper layer sheet 13 to the lower layer sheet 14, it is preferably not applied to the entire opposing surface of the upper layer sheet 13 or the lower layer sheet 14.

Referring to FIG. 2, the thickness dimension D1 of the drip sheet 10 is about 2.0 to 4.0 mm, preferably 2.5 mm or less, and the thickness dimension D2 of the upper layer sheet 13 is about 0.4 to 2.0 mm. The thickness dimension D3 of the lower layer sheet 14 is about 0.8 to 3.6 mm. The mass of the upper layer sheet 13 is about 20-50 g / m ² , the apparent density is about 0.01-0.1 g / cm ³ , and the mass of the lower layer sheet 14 is about 30-100 g / m ² , and the apparent density is about 0.01 to 0.07 g / cm ³ . A thickness measuring device (manufactured by PEACOCK, measuring surface φ44 mm, measuring pressure 3 g / cm ³ ) was used for measuring the thickness dimension of each sheet. For convenience of explanation, the drip sheet 10 is divided into a first layer 20 that is an upper part of the upper sheet 13, a second layer 21 that is a lower part of the upper sheet 13, and a third layer 22 that is a lower sheet 14.

In the upper layer sheet 13, as described above, in the manufacturing process of the air-through method, the net support surface side made of fibers deposited on the net is the upper surface 11 on which food is placed, and the hot air of the second layer 21 is blown on the upper layer sheet 13. The number of fusion parts 17 in which the fibers are thermally fused is greater than that of the first layer 20. Further, since the fibers are pressed against the net and restrained from each other on the net support surface, the first layer 20 is denser than the second layer 21 and forms the upper surface 11 of the upper layer sheet 13. Is flatter than the surface of the upper sheet 13 facing the lower sheet 14. In the drip sheet 10 having such an embodiment, when it is placed in a styrofoam tray and fresh food such as meat and vegetables is placed on the surface, the drip (blood juice) that exudes from the food is the upper layer sheet 13. While temporarily storing, it is moved to the lower layer sheet 14 through the fiber gap, and the drip can be absorbed and held by the lower layer sheet 14. The absorption amount of the upper layer sheet 13 is about 500 to 1000 g / m ² , the absorption amount of the lower layer sheet 14 is about 1000 to 2000 g / m ² , and the lower layer sheet 14 absorbs more than twice the amount of the upper layer sheet 13. Can do.

  Usually, a commercially available drip sheet is composed of a perforated plastic film and a liquid absorbent sheet located below the perforated plastic film. Since the perforated plastic film itself does not have liquid absorbency, the lower layer liquid absorbent sheet Only plays the role of absorbing and holding the drip. Therefore, in order to realize the required amount of liquid absorption, it is necessary to increase the thickness of the lower liquid absorption sheet in accordance with the amount of liquid absorption. There is a problem of being bulky. In addition, since the upper plastic film has a plurality of apertures, the drip can be quickly moved downward from the surface of the drip sheet, while liquid return due to rewetting is likely to occur, and the food material comes into contact with the drip again and is fresh. There is a problem that decreases.

  In the drip sheet 10 of the present embodiment, not only the lower layer sheet 14 but also the upper layer sheet 13 has liquid absorbency, so that the thickness dimension of the entire drip sheet 10 is suppressed even when the required amount of liquid absorption is required. Can be formed relatively thin. Thereby, the raw fabric roll does not become bulky at the time of manufacture and use of the drip sheet 10 and the lower layer sheet 14. In particular, when the lower layer sheet 14 has a thickness dimension equal to or greater than a predetermined size, the bulk of the portion located on the core side of the original roll is crushed, and the amount of liquid absorption is larger than the portion located on the outer side of the winding. The liquid absorption amount may be uneven in each product. Further, since the drip is moved downward through the fiber gap of the upper layer sheet 13, liquid return due to rewetting can be suppressed, and food can be prevented from coming into contact with the drip again.

Moreover, when the drip sheet 10 is formed only from an airlaid fiber nonwoven fabric, the surface thereof has an undulating shape that repeats large and small irregularities, and the surface of the food may be damaged and drip may be easily generated. In order to prevent such disadvantages, it is necessary to cut the surface of the airlaid fiber nonwoven fabric in contact with food with a cutter or the like. In the case of the drip sheet 10 of this embodiment, the upper surface 11 side of the upper layer sheet 13 is the air through fiber nonwoven fabric. Therefore, the outer surface is flat, and it is not necessary to perform such smoothing. In the first layer 20, the fibers are constrained and relatively dense, whereas in the second layer 21, the fibers are not constrained and are relatively sparse. Specifically, the apparent density of the constituent fibers of the first layer 20 is about 0.07 to 0.09 g / cm ³ , and the apparent density of the constituent fibers of the second layer 21 is about 0.03 to 0.06 g / cm. cm ³ . When the surface of the drip sheet 10 is formed from the sprayed surface of the upper layer sheet 13, the fibers are relatively sparse compared to the net support surface, so the fiber gap is large and the drip moves to the lower layer sheet 14 more quickly. Can be made. However, when the drip is absorbed in a relatively short time, the water retention component of the food placement surface is drastically reduced, and the placement surface is partially dried, which tends to cause discoloration, cracks, and the like. In the present embodiment, since the net support surface of the upper layer sheet 13 is the upper surface 11 of the drip sheet 10, the drip is not absorbed in a relatively short time. Therefore, even if the food is displayed in a state where it is packed for a predetermined time (about 2 to 10 hours) at a retail store such as a supermarket, the moisture on the mounting surface is sufficient to keep the food at a certain level of freshness. The absorption speed of the drip sheet 10 is adjusted so that it is not excessively absorbed.

  Mean pore diameter (pore size), which means the fiber gap of the upper layer sheet 13, is 400 to 1000 μm, and the average pore diameter of the lower layer sheet 14 is 80 to 150 μm. Since the average hole diameter of the upper layer sheet 13 is larger than the average hole diameter of the lower layer sheet 14, a space for temporarily retaining the drip in the upper layer sheet 13 can be secured, and the required time for using the drip sheet 10 (2 to 2). 10 hours), the drip can be gradually moved downward. When the average pore diameter of the upper layer sheet 13 is 400 μm or less, the water retention capacity of the upper layer sheet 13 is lowered, the drip is moved to the lower layer sheet 14 in a relatively short time, and the upper surface 11 in contact with the food is in a dry state. There is a fear. On the other hand, when the average pore diameter of the upper layer sheet 13 is 1000 μm or more, the fiber gap becomes too large, so that the drip quickly passes through the upper layer sheet 13 and moves to the lower layer sheet 14, so that the upper layer sheet 13 is maintained as required. Cannot have hydraulic power. Moreover, it is preferable that the fineness of the composite fiber of the upper layer sheet 13 is 1.0 to 6.0 dtex. This is because the strength is insufficient in the case of 1.0 dtex or less, and the capillarity is weakened in the case of 6.0 dtex or more, which may lower the barrier function against rewetting. Further, the second layer 21 is preferably subjected to a hydrophilic treatment in order to quickly move the drip to the third layer 22.

<Measuring method of average pore diameter of upper and lower layer sheets 13 and 14>
The average pore diameter of each fiber nonwoven fabric of the present invention is measured by using a porous material automatic pore measuring system (Automated Perm Porometer (manufactured by Porous Materials, Inc.) as a measuring device, and a bubble point method (ASTM F-316-80). It is calculated by.

  Absorption composed of a non-woven fiber topsheet located on the skin facing surface side of the wearer, usually used in disposable diapers and sanitary napkins, and an absorbent core made of a mixture containing fluff pulp located below In the case of a member, in order to separate the excreted bodily fluid from the skin of the wearer, the bodily fluid is quickly transferred from the top sheet (within a few minutes after excretion) to the lower absorbent core, and the surface of the top sheet is Must be dry. Therefore, the surface of the top sheet is subjected to a hydrophilic treatment, or the fiber density of the top sheet and / or the absorbent core is gradually increased downward. However, in the drip sheet 10, if the drip is absorbed rapidly from the upper surface 11, the moisture of the food is excessively absorbed and part of the food may be dried. Accordingly, in the drip sheet 10, it is preferable that the upper surface 11 is not subjected to a hydrophilic treatment, and the fiber density of the upper layer sheet 13 is set so that the first layer 20 is higher than the second layer 21.

  Referring to FIG. 3, a relatively large gap is formed between the second layer 21 and the third layer 22 in a region where the bonding portion 15 does not exist. As described above, since the separation gap is formed between the second layer 21 and the third layer 22 in the region where the bonding portion 15 does not exist, the capillary phenomenon hardly occurs and the drip is difficult to move downward. Therefore, for example, in the portion of the drip sheet 10 where the food is not placed, pressure due to the weight of the food is not applied, so the drip does not move downward in the region where the separation gap is formed, and the upper surface 11 A drip remains in a range not directly touching the food, and drying in the tray can be prevented.

  FIG. 4 shows an example of a use example of the drip sheet 10. In this use example, the food 29 from which the drip such as meat and fish exudes is formed between the composite sheet 30 composed of a plurality of sheets. It is arranged in the middle. The composite sheet 30 has a three-layer structure including a first outer sheet 31, a second outer sheet 32, and an intermediate sheet 33 positioned between the first and second outer sheets 31 and 32. The first and second outer surface sheets 31 and 32 are formed from an air-through fiber nonwoven fabric similarly to the upper layer sheet 13, and the intermediate sheet 33 is formed from an air-laid fiber nonwoven fabric similar to the lower layer sheet 14. The surfaces of the first and second outer sheets 31, 32 that are in contact with food are net support surfaces, the fibers are arranged densely compared to the smooth and opposite surface, and the food is not damaged. Do not absorb too much moisture in food. Examples of such use include, for example, when delivering to a retail store such as a supermarket by a truck or the like, or storing the product before displaying it on a display shelf in the retail store. In such a case, the combination of the drip sheet 10 and the food 29 is often stored in a stacked state, and the food 29 is deformed by a load from above, or the drip sheet positioned on the upper and lower contact surfaces. 10, the moisture of the food 29 is excessively absorbed and the freshness of the food may be reduced. According to the composite sheet 30 in this use example, even in such a case, the first and second outer sheet 31 and 32 made of fiber nonwoven fabric are positioned above and below the food 29, and the contact surfaces thereof are air-through fiber nonwoven fabric. Since it is a net support surface, the cushioning property is excellent and the surface of the food 29 is not damaged. In addition, the drip can be reliably absorbed in the intermediate sheet 33 without the possibility that the moisture of the food 29 is excessively absorbed.

  Table 1 shows the evaluation of characteristics and performance in order to manufacture a plurality of drip sheets under various conditions and compare them with conventional products.

[Measuring method]
<Sheet thickness>
Based on the standard of JISL1096.6.5, it is measured using a desktop thickness meter (manufactured by PEACOCK, measuring surface φ44 mm, measuring pressure 3 g / cm ² ). First, a sample of 100 mm × 100 mm is cut out from each drip sheet, and the center of the sample is gently sandwiched between discs positioned up and down, and the value of the measuring instrument at that time is obtained.

<Rewet amount>
A 10 cm × 10 cm stainless steel plate (200 g) with a hole having a diameter of 1 inch is placed in the center of the drip sheet used for each thickness measurement, and 20 ml of colored raw food is injected into the hole. Next, five 50 mm × 50 mm filter papers were stacked on the center of each drip sheet, and a load of 500 g was applied on the drip sheet for 10 minutes, and then the weight of the filter paper was measured to obtain a rewetting amount (g).

<Water retention amount>
A 140 mm × 60 mm sample is cut from each drip sheet, and the mass (Ag) of each sample is measured. After measuring the weight, the sample is placed on a 10-mesh wire net, and the whole sample is immersed in a test solution (tap water, physiological saline, cooking oil, meat or fish blood juice, etc.) placed in a tray. After soaking in the test solution for 3 minutes, the sample is taken out of the tray together with the wire mesh, drained lightly, and allowed to stand for 5 minutes. Then, the sample is placed on the sample table, a 420 g weight is placed on the sample, and left as it is for 3 minutes. Measure the mass of the sample after 3 minutes (Bg). Using the values (A, B) obtained by the above measurement method, the water retention amount is obtained by the following calculation method. The measurement was performed three times, and the average value was used as the water retention amount of each sheet.
Water retention amount (g / m ² ) = (BA) /0.06/0.14

<Evaluation method for maintaining freshness>
Results of the test, rewet amount of drip sheet 10 than 0.5g, water retention capacity is at least, 2500 g / ^{m 2} or more, preferably, in the case of 2500~3500g / ^{m 2,} without the surface of the food product is dried, It was found that the drip was absorbed moderately. Therefore, when the rewetting amount and the water retention amount satisfy the above conditions, the freshness retention determination is good “◯”, and otherwise, it is “bad”.

<Example 1>
An air-through fiber nonwoven fabric having a thickness of 1.30 mm, a mass of about 30 g / m ² and an average pore diameter of about 400 μm using a polyethylene / polypropylene core-sheath composite fiber having a fineness of about 2.2 dtex as the upper layer sheet 13, and NBKP as the lower layer sheet 14 An airlaid fiber nonwoven fabric having a thickness of 1.2 mm and a mass of about 80 g / m ² using (conifer kraft bleached pulp) as the main raw material (NBKP 85 mass%, binder 15%) was used. The upper layer sheet 13 has a net support surface as an upper surface and a spray surface as a lower surface. In the drip sheets of Examples 2 to 4 and Comparative Examples 1 and 2, the lower layer sheet 14 was the same as that of Example 1.

<Example 2>
As the upper layer sheet 13, a 1.30 mm thick, 30 g / m ² mass, an average pore diameter of 600 μm, and an air-through fiber nonwoven fabric using polyethylene / polypropylene core-sheath composite fibers having a fineness of about 2.7 dtex were used.

<Example 3>
As the upper layer sheet 13, an air-through fiber nonwoven fabric having a thickness of 1.30 mm, a mass of 30 g / m ² , and an average pore diameter of 800 μm using a polyethylene / polypropylene core-sheath composite fiber having a fineness of about 3.2 dtex was used.

<Example 4>
As the upper layer sheet 13, an air-through fiber nonwoven fabric having a thickness of 1.30 mm, a mass of 30 g / m ² and an average pore diameter of 1000 μm using a polyethylene / polypropylene core-sheath composite fiber having a fineness of about 6.0 dtex was used.

<Comparative Example 1>
As the upper layer sheet, an air-through fiber nonwoven fabric having a thickness of about 1.30 mm, a mass of about 30 g / m ² and an average pore diameter of about 200 μm using a polyethylene / polypropylene core-sheath composite fiber having a fineness of about 0.5 dtex was used.

<Comparative Example 2>
As the upper layer sheet, an air-through fiber nonwoven fabric having a thickness of about 1.30 mm, a mass of about 30 g / m ² , and an average pore diameter of about 1200 μm using a polyethylene / polypropylene core-sheath composite fiber having a fineness of about 10.0 dtex was used.

<Measurement results>
Since the drip sheet 10 of Examples 1 to 4 had a rewetting amount of about 0.3 to 0.4 g and a water retention amount of about 3000 g / m ² or more, the evaluation of the fineness retention determination was good “◯”. there were. On the other hand, the water retention amount of Comparative Example 1 was about 2700 g / m ² , but the rewetting amount was about 1.2 g because the average pore diameter was relatively small. Further, the rewetting amount of Comparative Example 2 was about 0.35 g, but the water retention amount was about 2300 g / m ² . From this measurement result, when the average pore size is relatively small, that is, when the average pore size is smaller than 400 μm, the amount of rewet is relatively large, and drip such as blood juice may accumulate in the tray. Moreover, in the upper layer sheet 13, when the fiber fineness is relatively large and the average pore diameter is relatively large, the drip is not retained by the upper layer sheet 13, and the contact surface of the food with the drip sheet 10 is dried. There is a risk of it.

  Unless otherwise specified, each constituent member constituting the drip sheet 10 is not limited to the materials described in this specification, but is limited to various known materials that are commonly used in this type of field. Can be used. In addition, the terms “first”, “second”, and “third” used in the present specification and claims are merely used to distinguish similar elements, positions, and the like.

The disclosure relating to the present invention described above can be summarized in at least the following matters.
A liquid-permeable and liquid-absorbing upper layer sheet having an upper surface and a lower surface and a thickness direction and defining the upper surface, and a liquid-absorbing and liquid-retaining lower layer sheet defining the lower surface In the drip sheet, the upper layer sheet is formed from a fiber nonwoven fabric containing at least hydrophobic fibers, the lower layer sheet is formed from a fiber nonwoven fabric containing at least hydrophilic fibers, and the average pore diameter of the upper layer sheet is the average of the lower layer sheet greatly than the diameter, the upper layer sheet is formed from an air-through fibrous nonwoven fabric containing heat-fusible fibers, a first layer defining said top surface, located on the lower surface of the first layer, facing the lower sheet The fiber gap of the first layer is smaller than the fiber gap of the second layer in a cross-sectional view of the upper layer sheet .

The drip sheet according to the present invention disclosed in the paragraph 0040 can include at least the following embodiments.
(1) The upper layer sheet has an average pore size of about 400 to 1000 μm, and the lower layer sheet has an average pore size of about 80 to 150 μm.
(2) The upper layer sheet has a mass of about 20 to 50 g / m ² and a thickness of about 0.4 to 2.0 mm.
( 3 ) In the upper sheet, the number of heat-fusible fiber fusion portions per unit area located in the second layer is the number of heat-fusible fiber fusion portions located in the first layer. The upper surface of the upper layer sheet is smoother than the lower surface thereof.
( 4 ) Of the first and second layers, only the second layer is subjected to a hydrophilic treatment.
( 5 ) The apparent density of the constituent fibers of the first layer is about 0.07 to 0.09 g / cm ³ , and the apparent density of the constituent fibers of the second layer is about 0.03 to 0.06 g / cm ^3. It is.

DESCRIPTION OF SYMBOLS 10 Drip sheet 11 Upper surface 12 Lower surface 13 Upper layer sheet 14 Lower layer sheet 15 Bonding part 17 Fusion part 18 Constituent fiber 19 of upper layer sheet 20 Constituent fiber 20 of lower layer sheet 1st layer 21 2nd layer 22 3rd layer 30 Composite sheet Z Thickness direction

Claims (6)

A liquid-permeable and liquid-absorbing upper layer sheet having an upper surface and a lower surface and a thickness direction and defining the upper surface, and a liquid-absorbing and liquid-retaining lower layer sheet defining the lower surface In drip sheet,
The upper layer sheet is formed from a fiber nonwoven fabric containing at least hydrophobic fibers, and the lower layer sheet is formed from a fiber nonwoven fabric containing at least hydrophilic fibers,
Greatly than the average pore size of the average pore size of the upper layer sheet is the lower layer sheet,
The upper layer sheet is formed from an air-through fiber nonwoven fabric containing heat-fusible fibers, and includes a first layer that defines the upper surface, and a second layer that is located on the lower surface of the first layer and faces the lower layer sheet. The drip sheet according to claim 1, wherein the fiber gap of the first layer is smaller than the fiber gap of the second layer in a sectional view of the upper layer sheet.   2. The drip sheet according to claim 1, wherein the upper layer sheet has an average pore size of about 400 to 1000 μm, and the lower layer sheet has an average pore size of about 80 to 150 μm. The drip sheet according to claim 1 or 2, wherein the upper layer sheet has a mass of about 20 to 50 g / m ² and a thickness of about 0.4 to 2.0 mm. In the upper layer sheet, the number of fusion parts of heat-fusible fibers per unit area located in the second layer is larger than the number of fusion parts of the heat-fusible fibers located in the first layer. The drip sheet according to any one of claims 1 to 3 , wherein the upper surface of the upper layer sheet is smoother than its lower surface. The drip sheet according to any one of claims 1 to 4 , wherein a hydrophilic treatment is performed only on the second layer of the first and second layers. The apparent density of the constituent fibers of the first layer is about 0.07 to 0.09 g / cm ³ , and the apparent density of the constituent fibers of the second layer is about 0.03 to 0.06 g / cm ^3. Item 6. The drip sheet according to any one of Items 1 to 5 .

Images