Drip Sheet

Abstract

To provide a drip sheet that has excellent water absorption and retention capabilities, and that effectively prevents drips from re-contacting food, thereby helping to maintain the freshness of food. [Solution] A drip sheet comprising a liquid-permeable sheet 3 for placing food, an intermediate sheet 5 for absorbing drips from food, and a back sheet 7 in that order, and having a planar direction P and a thickness direction T, wherein the liquid-permeable sheet 3 is made of an open film having a plurality of through holes 13 for allowing drips to pass through, the intermediate sheet 5 is made of first fibers, and the back sheet 7 is made of second fibers, and the fiber density of the second fibers of the back sheet 7 is higher than the fiber density of the second fibers of the intermediate sheet 5.

Description

[Technical Field]

[0001] This invention relates to a drip sheet. [Background technology]

[0002] In recent years, in the sale of food products such as meat and fish in tray packs, drip sheets have been placed between the food and the tray pack, and between stacked food items, for the purpose of absorbing moisture seeping from the food (hereinafter referred to as "drip").

[0003] One known configuration for a drip sheet that absorbs drips is one that combines a surface layer having an open film on the surface that comes into contact with food and an absorbent layer of airlaid nonwoven fabric formed of a fiber layer. For example, Patent Document 1 describes a laminated, integrated absorbent mat with a two-layer structure consisting of an opaque polyolefin film on one side and an airlaid nonwoven fabric containing heat-adhesive synthetic fibers on the other side, wherein the airlaid nonwoven fabric is made up of a mixture of heat-adhesive synthetic fibers and pulp fibers in a ratio of 90 / 10 to 100 / 0% by weight, and the heat-adhesive synthetic fibers are heat-bonded to each other and / or to the pulp fibers, with a basis weight of 5 g / m². 2 Over 12g / m 2 The following consists of a surface layer on both sides, and a mixture of heat-bondable synthetic fibers and pulp fibers in a ratio of 60 / 40 to 85 / 15% by weight, which is heat-bonded in the same way as the surface layer, with a basis weight of 8 to 60 g / m². 2 It consists of an inner layer and, as a whole, the space between the outer layer and the inner layer is also integrated by heat bonding of the heat-adhesive synthetic fibers, the ratio of tensile strength in the warp and weft is 0.7 to 1.1 in both dry and wet conditions, the ratio of tensile strength (warp) in dry and wet conditions is 0.6 to 1.1, the moisture absorption is 5 to 20 g / g, and the total basis weight is 20 to 80 g / m 2Disclosed is a laminated, integrated food absorbent mat, characterized in that it is an airlaid nonwoven fabric with an integrated layered structure, and the polyolefin film and the airlaid nonwoven fabric are melted and heat-bonded together using a hot needle, thereby laminating and integrating them while also creating holes in the film.

[0004] Furthermore, Patent Document 2 discloses a liquid absorbent comprising a liquid absorbent layer formed of hydrophilic treated synthetic fibers and / or hydrophilic fibers, and a synthetic resin film having a number of perforations bonded to the surface of the liquid absorbent layer, wherein the synthetic resin film is melt-extruded and laminated to the surface of the liquid absorbent layer, and the liquid absorbent layer and the synthetic resin film are in close contact. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2005-067023 [Patent Document 2] Japanese Patent Publication No. 2002-067206 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, in the food absorbent mat described in Patent Document 1, the absorbent layer is made of airlaid nonwoven fabric, and therefore the binder component from the spray binder adheres to the pulp fibers. In the above food absorbent mat, the absorbent capacity of the inner layer is reduced due to the adhesion of the binder component, making it difficult for drip to move from the inner layer to the lower layer, and causing the drip to remain on the upper layer of the absorbent layer, which may prevent moisture retention and hinder further drip absorption.

[0007] Furthermore, the liquid absorber of Patent Document 2 has a two-layer structure consisting of a synthetic resin film and a liquid absorption layer, and the absorbed liquid is retained even near the interface between the synthetic resin film and the liquid absorption layer. Therefore, when the liquid absorber is used by being laid under food that generates drip, in the above liquid absorber, the absorbed drip remains in the vicinity of the food, and the drip in which bacteria have propagated comes into re-contact with the food, which may cause deterioration of the freshness of the food.

[0008] An object according to the present disclosure is to provide a drip sheet that is excellent in water absorption capacity and water retention capacity, and that can easily maintain the freshness of food by suppressing re-contact of drip with food. [Means for Solving the Problems]

[0009] One aspect according to the present disclosure is a drip sheet that includes, in that order, a liquid-permeable sheet for placing food, an intermediate sheet for absorbing drip derived from food, and a back surface sheet, and has a planar direction and a thickness direction, wherein the liquid-permeable sheet is constituted by an apertured film having a plurality of through-hole portions for allowing the drip to pass therethrough, the intermediate sheet is constituted by first fibers, the back surface sheet is constituted by second fibers, and the fiber density of the second fibers of the back surface sheet is higher than the fiber density of the first fibers of the intermediate sheet. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a drip sheet that is excellent in water absorption capacity and water retention capacity, and that can easily maintain the freshness of food by suppressing re-contact of drip with food. [Brief Description of the Drawings]

[0011] [Figure 1] FIG. 1 is a plan view of a drip sheet 1 according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a partial cross-sectional perspective view taken along the section II-II in FIG. 1. [Figure 3]FIG. 3 is a cross-sectional view taken along the section III-III in FIG. 1. [Figure 4] FIG. 4 is a cross-sectional view taken along the section IV-IV in FIG. 1. [Figure 5] FIG. 5 is a diagram for explaining the function of the drip sheet 1 according to the embodiment of the present disclosure. [Figure 6] FIG. 6 is a diagram for explaining the function of the drip sheet 1 according to the embodiment of the present disclosure. [Figure 7] FIG. 7 is a diagram for explaining the back sheet constituting the drip sheet 1 according to the embodiment of the present disclosure. [Figure 8] FIG. 8 is a diagram for explaining the back sheet constituting the drip sheet 1 according to the embodiment of the present disclosure. [Figure 9] FIG. 9 is a 50-times magnified SEM photograph of a drip sheet for explaining an example. [Mode for Carrying Out the Invention]

[0012] Specifically, the present disclosure relates to the following aspects. [Aspect 1] A drip sheet having a planar direction and a thickness direction, comprising a liquid-permeable sheet for placing food thereon, an intermediate sheet for absorbing drip derived from food, and a back sheet in that order, wherein the liquid-permeable sheet is constituted by an apertured film provided with a plurality of through-holes for allowing the drip to permeate therethrough, the intermediate sheet is constituted by first fibers, the back sheet is constituted by second fibers, and the fiber density of the second fibers of the back sheet is higher than the fiber density of the first fibers of the intermediate sheet, the drip sheet.

[0013] When the drip sheet comes into contact with drip, the drip is caused to pass through the through-holes of the liquid-permeable sheet. The drip that has passed through the through-holes transfers to the intermediate sheet and the back sheet. Because the fiber density of the second fiber in the above-mentioned drip sheet is higher than that of the first fiber, it facilitates the transfer of drip that has moved to the intermediate sheet to the back sheet. Furthermore, because the intermediate sheet transfers the drip to the back sheet, it is easier for the intermediate sheet to secure enough capacity to draw in drip from the liquid-permeable sheet side, thus the above-mentioned drip sheet has excellent water absorption and water retention capabilities.

[0014] Generally, bacteria multiply in the drip released from food over time. When the drip comes into contact with food again, the increased bacteria reduce the food's freshness. Therefore, the longer the drip remains in the area of ​​the drip sheet closest to the food, the more likely the food is to lose freshness due to re-contact with the drip. Therefore, in the above-mentioned drip sheet, the second fiber has a predetermined fiber density. As a result, the back sheet can easily draw in and retain drip, so the drip sheet can easily retain drip in an area far from the food. This makes it easier for the drip sheet to suppress re-contact of drip with the food, thereby helping to maintain the freshness of the food.

[0015] Furthermore, because the drip sheet easily retains drip on the back sheet, even when food trays using the drip sheet are displayed at an angle in stores, it is difficult for the drip to flow back to the middle sheet. As a result, the drip sheet is able to suppress drip leakage from the back sheet, and therefore has excellent water retention capabilities.

[0016] Therefore, the above-mentioned drip sheet has excellent water absorption and retention capabilities, and it is easy to prevent drips from coming into contact with food again, thus making it easier to maintain the freshness of food. In this specification, "first fiber" refers to the fiber constituting the intermediate sheet, and "second fiber" refers to the fiber constituting the backing sheet. Each of the first and second fibers may include one or more types of fibers.

[0017] [Aspect 2] The above-mentioned intermediate sheet is an airlaid nonwoven fabric containing pulp fibers and heat-fusible fibers as the first fibers, the heat-fusible fibers form a three-dimensional network structure through interfiber bonding, and the pulp fibers are held within the three-dimensional network structure. A drip sheet as described in Embodiment 1.

[0018] The intermediate sheet has a three-dimensional network structure formed by the heat-fusible fibers. Therefore, the intermediate sheet facilitates the transfer of drip to the back sheet. As a result, the drip sheet easily secures the amount of drip that can be drawn from the liquid-permeable sheet to the intermediate sheet, and the drip sheet has excellent water absorption and water retention capabilities.

[0019] Furthermore, in the above-mentioned drip sheet, the pulp fibers are held together by the heat-fusible fibers. Therefore, compared to a drip sheet in which pulp fibers are bonded together using a binder component (e.g., latex), the above-mentioned drip sheet allows the pulp fibers to exhibit greater water absorption and retention capabilities. As a result, the above-mentioned drip sheet has superior water absorption and retention capabilities.

[0020] [Aspect 3] The above-mentioned intermediate sheet contains the above-mentioned pulp fibers and the above-mentioned heat-fusible fibers in proportions of 40-80% by mass and 20-60% by mass, respectively. The drip sheet described in Embodiment 2.

[0021] In the above-mentioned drip sheet, the intermediate sheet contains a predetermined amount of fibers in a predetermined ratio. Therefore, the above-mentioned drip sheet has excellent water retention capacity because it is easy to ensure the thickness of the intermediate sheet. Furthermore, by ensuring the thickness of the intermediate sheet, the drip sheet makes it easier to retain the drip transferred to the back sheet in an area far from the food, and also makes it easier to suppress the drip from coming into contact with the food again. As a result, the drip sheet is better able to maintain the freshness of the food.

[0022] Furthermore, since the drip sheet contains the heat-fusible fibers in a predetermined ratio, the three-dimensional network structure of the heat-fusible fibers easily supports the pulp fibers, and the heat-fusible fibers more easily hold the pulp fibers. As a result, the drip sheet is less prone to fraying and shedding of the pulp fibers, making it easier for the pulp fibers to exhibit their water absorption and water retention capabilities, thus resulting in superior water absorption and water retention.

[0023] [Aspect 4] The fiber density of the second fiber in the back sheet is at least twice the fiber density of the first fiber in the intermediate sheet. A drip sheet as described in any one of the three embodiments.

[0024] In the above-described drip sheet, the back sheet has a predetermined fiber density. Therefore, the above-described drip sheet facilitates the transfer of drip from the intermediate sheet to the back sheet by capillary action, and also facilitates the further drawing of drip into the back sheet without causing it to stagnate in the intermediate sheet. As a result, the above-described drip sheet has excellent water absorption capacity. Furthermore, the drip sheet described above easily draws drip onto the back sheet described above. Therefore, the drip sheet makes it easier to retain drip in an area far from the food, and also makes it easier to prevent the drip from coming into contact with the food again. As a result, the drip sheet makes it easier to maintain the freshness of food.

[0025] [Aspect 5] The above back sheet contains hydrophilic fibers as the second fiber, The above-mentioned back sheet has hydrophilic fibers at a density of 200 fibers / mm² in a cross-section parallel to the thickness direction. 2 Contains the above fiber density, A drip sheet as described in Embodiment 4.

[0026] The backing sheet described above contains hydrophilic fibers at a predetermined fiber density. Therefore, the backing sheet has excellent water absorption and water retention capabilities, and also facilitates the drawing of drip from the intermediate sheet. As described above, the drip sheet has excellent water absorption and water retention capabilities.

[0027] Generally, when drip sheets used in food trays are displayed at an angle in a store, the drip held by the drip sheet may be released and come into contact with the food again. Therefore, the drip sheet described above has a backing sheet made of hydrophilic fibers with a predetermined fiber density. Consequently, the backing sheet easily exhibits water absorption and water retention capabilities, and the drip sheet easily retains drip in an area far from the food, even when the food tray is displayed at an angle. As a result, the drip sheet makes it easier to maintain the freshness of food.

[0028] [Aspect 6] The above intermediate sheet is thicker than the above backing sheet. A drip sheet as described in any one of the descriptions 1 to 5.

[0029] In the above-described drip sheet, the intermediate sheet is thicker than the backing sheet. Therefore, the above-described drip sheet is more effective at retaining the drip that has migrated to the backing sheet in an area far from the food, and at suppressing the drip from coming into contact with the food again. As a result, the above-described drip sheet is more effective at maintaining the freshness of food.

[0030] [Aspect 7] The liquid-permeable sheet has a placement surface on which food is placed and a non-placement surface on the opposite side of the placement surface, and the liquid-permeable sheet has a plurality of recesses on the non-placement surface that are recessed toward the placement surface, and the first fibers of the intermediate sheet extend toward the placement surface in the thickness direction and include fibers that enter into the recesses. A drip sheet as described in any one of the embodiments 1 to 6.

[0031] The above-mentioned drip sheet has an intermediate sheet equipped with predetermined fibers. Therefore, when the drip sheet absorbs a large amount of drip, the fibers that enter the recessed area from the intermediate sheet make it easier to retain the drip in the recessed area, and the intermediate sheet makes it easier to secure the capacity to draw in the drip from the mounting surface side of the liquid permeable sheet. As a result, the above-mentioned drip sheet has excellent water absorption and water retention capabilities. Furthermore, in the above-mentioned liquid-permeable sheet, since the recessed portion does not penetrate in the thickness direction, the drip held in the recessed portion is less likely to flow back onto the surface described above. As a result, even when the drip sheet absorbs a large amount of drip, it is easier to suppress the drip from coming into contact with the food again, thereby helping to maintain the freshness of the food.

[0032] [Aspect 8] The second fiber of the back sheet described above includes multiple types of fibers with different fineness. A drip sheet as described in any one of the embodiments 1 to 7.

[0033] The backing sheet described above contains multiple types of fibers with different finenesses, that is, it contains fibers with relatively high fineness and fibers with relatively low fineness. The fibers with relatively high fineness help to maintain the structure of the backing sheet, and the fibers with relatively low fineness help to diffuse the drip that has migrated to the backing sheet throughout the backing sheet by capillary action, so that the backing sheet can easily absorb and retain the drip. Therefore, the drip sheet has excellent water absorption and water retention capabilities. Furthermore, the above-mentioned drip sheet has a backing sheet that easily retains drip, making it easier to keep the drip away from the food and preventing it from coming into contact with the food again. Therefore, the above-mentioned drip sheet is effective in maintaining the freshness of food.

[0034] [Aspect 9] The above back sheet has multiple embossed portions that are compressed in the thickness direction. A drip sheet as described in Embodiment 8.

[0035] Because the back sheet described above has multiple embossed areas, it becomes easier to draw in drips. Therefore, the drip sheet has excellent water absorption and water retention capabilities.

[0036] [Aspect 10] The above backing sheet includes spunbond nonwoven fabric. A drip sheet as described in Embodiment 8.

[0037] The above-mentioned backing sheet includes the above-mentioned spunbond nonwoven fabric, and the above-mentioned spunbond nonwoven fabric is generally composed of predetermined long fibers. Therefore, in the above-mentioned drip sheet, the above-mentioned backing sheet facilitates the diffusion of drip through the above-mentioned long fibers, and the above-mentioned backing sheet also facilitates further absorption of drip. As a result, the above-mentioned drip sheet has excellent water absorption and water retention capabilities. Furthermore, the aforementioned backing sheet is designed to retain drips in an area far from the food, and to prevent the drips from coming into contact with the food again. Therefore, the drip sheet is designed to help maintain the freshness of the food.

[0038] [Aspect 11] The above back sheet has multiple wrinkles extending in the plane direction, A drip sheet as described in embodiment 10.

[0039] In the above-described drip sheet, the back sheet has predetermined wrinkles. Therefore, the back sheet facilitates the diffusion of drip drawn into the back sheet in the planar direction, and as a result of the back sheet diffusing the drip in the planar direction, the back sheet becomes more able to draw in even more drip from the intermediate sheet. Therefore, the above-described drip sheet has excellent water absorption and water retention capabilities. Furthermore, the drip sheet described above has a backing sheet that easily retains drip in an area far from the food, and also effectively prevents the drip from coming into contact with the food again. Therefore, the drip sheet is effective in maintaining the freshness of the food.

[0040] Because the backing sheet of the above-mentioned drip sheet has predetermined wrinkles, when used in a food tray, a gap is easily formed between the surface of the food tray and the surface of the backing sheet, and the surface of the backing sheet in the gap is able to easily retain drip due to surface tension. Therefore, the above-mentioned drip sheet has excellent water absorption and water retention capabilities.

[0041] The drip sheet related to this disclosure will be explained in detail below.

[0042] Figures 1 to 4 are diagrams illustrating a drip sheet 1 according to an embodiment of the present disclosure (hereinafter referred to as "this embodiment"). Specifically, Figure 1 is a perspective view of a drip sheet 1 according to this embodiment. Figure 2 is a partial cross-sectional perspective view of the section II-II in Figure 1. Figure 3 is a cross-sectional view of the section III-III in Figure 1. Figure 4 is a cross-sectional view of the section IV-IV in Figure 1.

[0043] The drip sheet 1 comprises a liquid-permeable sheet 3, an intermediate sheet 5, and a back sheet 7 in that order, and has a planar direction P and a thickness direction T. Food is placed on the liquid-permeable sheet 3. The intermediate sheet 5 is composed of first fibers, and the back sheet 7 is composed of second fibers, and absorbs drip from the food. The fiber density of the second fibers in the back sheet 7 is higher than the fiber density of the first fibers in the intermediate sheet 5.

[0044] The liquid-permeable sheet 3 is made of an open film having a placement surface 9 on which food is placed and a non-placement surface 11 on the opposite side of the placement surface 9, and having a plurality of through-holes 13 for allowing drips to pass through. In addition, the liquid-permeable sheet 3 has a plurality of recesses 15 on the non-placement surface 11 that are recessed toward the placement surface 9.

[0045] When the drip sheet 1 comes into contact with drip, it allows the drip to pass through the through-holes 13 of the liquid-permeable sheet 3. The drip that passes through the through-holes then moves to the intermediate sheet 5 and the back sheet 7. Because the fiber density of the second fibers in the drip sheet 1 is higher than that of the first fibers, it is easy to transfer the drip that has moved from the liquid-permeable sheet 3 to the intermediate sheet 5 to the back sheet 7. In addition, because the intermediate sheet 5 transfers the drip to the back sheet 7, the intermediate sheet 5 has more capacity to draw in the drip from the liquid-permeable sheet 3 side, so the drip sheet 1 has excellent water absorption and water retention capabilities.

[0046] Generally, bacteria multiply in the drip released from food over time. When the drip comes into contact with food again, the increased bacteria reduce the food's freshness. Therefore, the longer the drip remains in the area of ​​the drip sheet closest to the food, the more likely the food is to lose freshness due to re-contact with the drip. Therefore, in the drip sheet 1, the second fibers have a predetermined fiber density. As a result, the back sheet 7 can easily draw in and retain the drip, so the drip sheet 1 can easily retain the drip in an area far from the food. This makes it easier for the drip sheet 1 to suppress the drip from re-contacting the food, thereby helping to maintain the freshness of the food.

[0047] Furthermore, because the drip sheet 1 easily retains drip on the back sheet 7, even if food trays using the drip sheet 1 are displayed at an angle in stores, it is difficult for the drip to flow back towards the intermediate sheet 5. As a result, the drip sheet 1 is able to suppress drip leakage from the back sheet 7, and therefore has excellent water retention capabilities.

[0048] Therefore, the drip sheet 1 has excellent water absorption and retention capabilities, and it is easy to prevent drips from coming into contact with food again, thus making it easier to maintain the freshness of food.

[0049] Each of the multiple through-holes 13 includes a mounting surface opening 17 located on the mounting surface 9, a non-mounting surface opening 19 located on the non-mounting surface 11 and in contact with the intermediate sheet 5, and a liquid guide portion 21 connecting the mounting surface opening 17 and the non-mounting surface opening 19, which allows drip to pass through. The mounting surface opening 17 and the non-mounting surface opening 19 serve as an inlet and outlet for drip seeping from the food, respectively.

[0050] The fluid guide section 21 includes a bent section 25 between the mounting surface opening 17 and the non-mounting surface opening 19. The bent section 25 is bent inward, has a bending angle θ, and is configured to bend further when a load in the thickness direction T is applied. The bent section 25 extends in the planar direction P, specifically encircling the fluid guide section 21 in the planar direction P.

[0051] In each of the multiple through-holes 13, the fluid guide portion 21 is divided into a first fluid guide portion 27 between the mounting surface opening 17 and the bent portion 25, and a second fluid guide portion 29 between the bent portion 25 and the non-mounting surface opening 19. In other words, the fluid guide portion 21 is divided into the first fluid guide portion 27, the bent portion 25, and the second fluid guide portion 29, starting from the mounting surface 9 side.

[0052] Multiple recesses 15 house protruding fibers 31 that extend from the non-mounting surface 11 side to the mounting surface 9 side in the thickness direction T, passing through recess openings 23 that open to the non-mounting surface 11 side.

[0053] The first thickness T1 of the first fluid guide portion 27 is greater than the second thickness T2 of the second fluid guide portion 29. As a result, when a predetermined load is applied to the drip sheet 1, the first fluid guide portion 27 maintains its shape, while the second fluid guide portion 29 is more easily deformed than the first fluid guide portion 27. The first thickness T1 refers to the thickness of the first fluid guide portion 27 at the midpoint in the thickness direction T, and the second thickness T2 refers to the thickness of the second fluid guide portion 29 at the midpoint in the thickness direction T.

[0054] Furthermore, the first length L1 in the thickness direction T of the first fluid guiding portion 27 is longer than the second length L2 in the thickness direction T of the second fluid guiding portion 29. As a result, when a predetermined load is applied, the drip sheet 1 can separate the food from the intermediate sheet 5. Therefore, the drip sheet 1 can easily suppress the re-contact of the drip absorbed by the intermediate sheet 5 with the food, thereby making it easier to maintain the freshness of the food.

[0055] The second fluid guide portion 29 is curved to protrude inward, and at least a portion of the non-mounting surface opening 19 in each of the multiple through-holes 13 is joined to the intermediate sheet 5. As a result, when a predetermined load is applied to the drip sheet 1, the second fluid guide portion 29 is easily deformed to increase the contact area with the intermediate sheet 5 without changing the position of the portion closer to the non-mounting surface opening 19.

[0056] In each of the multiple through-holes 13, the first fluid guide portion 27 is curved to protrude inward. This makes it easier to construct a structure similar to a semi-cylindrical shell structure in which the first fluid guide portion 27 is curved to protrude in the opposite direction to the intermediate sheet 5, and the first fluid guide portion 27 is less likely to collapse when a predetermined load is applied.

[0057] In each of the multiple through-holes 13, the mounting surface opening 17 has a substantially circular shape, and the multiple through-holes 13 are arranged in a staggered pattern, specifically in a 60° staggered pattern, in the planar direction P. This reduces the differences in rigidity, performance, etc., depending on the position in the liquid-permeable sheet 3.

[0058] The intermediate sheet 5 is an airlaid nonwoven fabric containing pulp fibers and heat-fusible fibers as primary fibers. The heat-fusible fibers form a three-dimensional network structure through interfiber bonding. The pulp fibers are held within the three-dimensional network structure. The intermediate sheet 5 has a three-dimensional network structure formed by the heat-fusible fibers. Therefore, the intermediate sheet 5 facilitates the transfer of drip to the back sheet 7. As a result, the drip sheet 1 can easily secure the amount of drip that can be drawn from the liquid-permeable sheet 3 to the intermediate sheet 5, and the drip sheet 1 has excellent water absorption and water retention capabilities.

[0059] Furthermore, in Drip Sheet 1, the pulp fibers are held together by heat-fusible fibers. Therefore, compared to Drip Sheet 1, in which pulp fibers are bonded together using a binder component (e.g., latex), the pulp fibers exhibit greater water absorption and retention capabilities. As a result, Drip Sheet 1 has superior water absorption and retention capabilities. The interfiber bonding between the heat-fusible fibers is, for example, achieved by heat fusion.

[0060] The intermediate sheet 5 contains pulp fibers in a mass ratio of 40% to 80% and heat-fusible fibers in a mass ratio of 20% to 60%. For example, the intermediate sheet 5 contains 60% pulp fibers and 40% heat-fusible fibers. In the drip sheet 1, the intermediate sheet 5 contains predetermined fibers in predetermined ratios. Therefore, the drip sheet 1 has excellent water retention capacity because it is easy to ensure the thickness of the intermediate sheet 5. In addition, by ensuring the thickness of the intermediate sheet 5, the drip sheet 1 makes it easier to retain the drip that has migrated to the back sheet 7 in an area far from the food, and also makes it easier to suppress the drip from coming into contact with the food again. As a result, the drip sheet 1 makes it easier to maintain the freshness of the food.

[0061] Furthermore, since the drip sheet 1 contains heat-fusible fibers in a predetermined ratio, the three-dimensional network structure of the heat-fusible fibers easily supports the pulp fibers, and the heat-fusible fibers more easily retain the pulp fibers. As a result, the drip sheet 1 is less prone to fraying and shedding of pulp fibers, allowing the pulp fibers to exhibit their water absorption and retention capabilities more easily, thus resulting in superior water absorption and retention.

[0062] The intermediate sheet 5 is longer than the backing sheet 7 in the thickness direction T. In other words, the intermediate sheet 5 is thicker than the backing sheet 7. Therefore, in the drip sheet 1, the intermediate sheet 5 occupies more than half of the area in the thickness direction T of the sheet that absorbs drip. Consequently, the drip sheet 1 is more likely to retain the drip that has migrated to the backing sheet 7 in an area far from the food, and is more likely to suppress the drip from coming into contact with the food again. For these reasons, the drip sheet 1 is more likely to maintain the freshness of the food.

[0063] The fiber density of the second fibers in the back sheet 7 is more than twice the fiber density of the first fibers in the intermediate sheet 5. In the drip sheet 1, the back sheet 7 has a predetermined fiber density. Therefore, the drip sheet 1 facilitates the transfer of drip from the intermediate sheet 5 to the back sheet 7 by capillary action, and also facilitates the further drawing of drip into the back sheet 7 without causing it to stagnate in the intermediate sheet 5. As a result, the drip sheet 1 has excellent water absorption capacity. In addition, the drip sheet 1 easily draws drip into the back sheet 7. Therefore, it is easy to retain drip in an area far from the food, and it is easy to suppress the drip from re-contacting the food. As a result, it is easy to maintain the freshness of the food.

[0064] The backing sheet 7 contains hydrophilic fibers as second fibers, and in a cross-section parallel to the thickness direction T, the backing sheet 7 has 200 hydrophilic fibers / mm 2 The fibers are included at the above fiber density. The back sheet 7 contains hydrophilic fibers at a predetermined fiber density, and therefore the back sheet 7 has excellent water absorption and water retention capabilities, and also facilitates the drawing of drip from the intermediate sheet 5. As described above, the drip sheet 1 has excellent water absorption and water retention capabilities.

[0065] Generally, when a food tray is displayed at an angle in a store, the drip sheet held by the drip sheet may release from the drip sheet 1 and come into contact with the food again. Specifically, due to the tilt of the food tray, the drip may flow back from the fiber-containing sheet of the drip sheet towards the surface on which it is placed. This backflowing drip may pass through the through-holes 13 of the liquid-permeable sheet 3 and come into contact with the food placed on the surface of the drip sheet.

[0066] Therefore, the back sheet 7 of the drip sheet 1 is made of hydrophilic fibers with a predetermined fiber density. Consequently, the back sheet 7 easily exhibits water absorption and water retention in both the planar direction P and the thickness direction T, and the drip sheet 1 easily suppresses the release of drip from the back sheet 7 even when food trays are displayed at an angle, thus making it easier to retain drip in an area far from the food. As a result, the drip sheet 1 is effective in maintaining the freshness of food.

[0067] Figures 5 and 6 are diagrams illustrating the function of the drip sheet 1. Figures 5 and 6 correspond to the end view at the III-III end face in Figure 1. As shown in Figure 5, when food 101 is placed on the placement surface 9 of the drip sheet 1, the drip 103 seeps out from the food 101 over time, enters the liquid guide section 21, and moves to the intermediate sheet 5.

[0068] The liquid-permeable sheet 3 has a non-mounting surface 11 and is equipped with a plurality of recesses 15 that are recessed toward the mounting surface 9. The plurality of recesses 15 house protruding fibers 31 that extend from the non-mounting surface 11 side toward the mounting surface 9 side in the thickness direction, passing through recess openings 23 that open toward the non-mounting surface 11 side. Because the fiber density of the back sheet 7 is higher than that of the intermediate sheet 5, the drip 103 that has moved to the intermediate sheet 5 is drawn into the back sheet 7 and diffuses from the liquid-permeable sheet 3 side (upper layer of intermediate sheet 5) to the back sheet 7 side (lower layer of intermediate sheet 5). The drip 103 that has diffused into the lower layer of the intermediate sheet 5 moves toward the back sheet 7.

[0069] On the other hand, if the amount of drip 103 absorbed by the drip sheet 1 is large and cannot be transferred to the back sheet 7 (when a large amount of drip has been absorbed), the drip 103 remains on the liquid permeable sheet 3 side (upper layer of the intermediate sheet 5) within the intermediate sheet 5. As shown in Figure 6, the drip 103 that remains on the liquid permeable sheet 3 side of the intermediate sheet 5 passes through the recessed opening 23 and is drawn into the recessed portion 15 by traveling along the protruding fibers 31 that extend to the recessed portion 15. Therefore, when the drip sheet 1 absorbs a large amount of drip 103, it becomes easier to retain the drip 103 in the recessed portion 15 by traveling along the protruding fibers 31, which are fibers that enter the recessed portion 15 from the intermediate sheet 5, and the intermediate sheet 5 can more easily secure the capacity to draw in the drip 103 from the mounting surface 9 side of the liquid permeable sheet 3. As a result, the drip sheet 1 has excellent water absorption and water retention capabilities.

[0070] Furthermore, in the liquid-permeable sheet 3, since the recessed portion 15 does not penetrate in the thickness direction T, the drip 103 held in the recessed portion 15 is less likely to flow back onto the mounting surface 9. As a result, even when the drip sheet 1 absorbs a large amount of drip 103, it is easier to suppress the drip 103 from re-contacting the food, thereby making it easier to maintain the freshness of the food.

[0071] Figure 7 is an explanatory diagram of the back sheet 7 in Figures 5 and 6. The back sheet 7 is composed of an SMMS nonwoven fabric (spunbond-meltblown-meltblown-spunbond nonwoven fabric) in which spunbond sheet 45 (spunbond nonwoven fabric), meltblown sheet 47 (meltblown nonwoven fabric), meltblown sheet 47 (meltblown nonwoven fabric), and spunbond sheet 45 (spunbond nonwoven fabric) are arranged in order in the thickness direction T and joined together.

[0072] The spunbond sheet 45 is composed of fibers with relatively high fineness, while the meltblown sheet 47 is composed of fibers with relatively low fineness. In other words, the second fibers of the backing sheet 7 include multiple types of fibers with different fineness. The second fibers constituting the backing sheet 7 each contain 100% by mass of polypropylene that has been hydrophilized by hydrophilization treatment.

[0073] The backing sheet 7 contains multiple types of fibers with different finenesses, that is, it contains fibers with relatively high fineness and fibers with relatively low fineness. The fibers with relatively high fineness make it easier to maintain the structure of the backing sheet 7, and the fibers with relatively low fineness make it easier for the drip that has moved to the backing sheet 7 to spread throughout the backing sheet by capillary action, so that the backing sheet 7 can easily absorb and retain the drip. Therefore, the drip sheet 1 has excellent water absorption and water retention capabilities. Furthermore, the drip sheet 1 has a backing sheet 7 that easily retains drip, making it easier to keep the drip away from the food and preventing it from re-contacting the food. Therefore, the drip sheet 1 is effective in maintaining the freshness of the food.

[0074] The backing sheet 7 contains a spunbond nonwoven fabric, which is generally composed of predetermined long fibers. Therefore, in the drip sheet 1, the backing sheet 7 facilitates the diffusion of drip through the long fibers, and also facilitates the further absorption of drip. As a result, it has excellent water absorption and water retention capabilities. Furthermore, the back sheet 7 makes it easier to keep the drip away from the food and also helps to prevent the drip from coming into contact with the food again. Therefore, the drip sheet 1 makes it easier to maintain the freshness of the food.

[0075] The back sheet 7 has multiple embossed portions 49 that are compressed in the thickness direction T, that is, from the inner surface 41 of the back sheet which is the side facing the intermediate sheet 5, toward the outer surface 43 of the back sheet which is the side opposite to the inner surface. The bottom of the embossed portions 49 are high-density portions 51 where the fiber density is higher than that of the parts of the back sheet 7 other than the embossed portions due to the compression. In addition, the embossed portions 49 form a gap between the intermediate sheet and the back sheet. As a result, the back sheet 7 has multiple embossed portions, making it easier to draw in the drip 103. Therefore, the drip sheet 1 has excellent water absorption and water retention capabilities.

[0076] Figure 8 is a diagram illustrating the back sheet 7 in Figure 1. The back sheet 7 has a plurality of wrinkles 53 extending in the planar direction P. The plurality of wrinkles 53 are present on both the inner surface 41 of the back sheet 7, which is the surface in contact with the intermediate sheet 5, and the outer surface 43 of the back sheet, which is the surface opposite to the inner surface 41 in the thickness direction. A drip sheet 1 having wrinkles 53 on the inner surface 41 of the back sheet has a gap between the intermediate sheet 5 and the back sheet 7. Similarly, a drip sheet 1 having wrinkles 53 on the outer surface 43 of the back sheet has a gap between it and an object in contact with the outer surface 43 of the back sheet, such as a food tray. Drip that has moved onto the back sheet 7 diffuses in the planar direction P by traveling through the gap.

[0077] In the drip sheet 1, the back sheet 7 has predetermined wrinkles. Therefore, the back sheet 7 easily diffuses the drip drawn into it in the planar direction P, and as a result of the back sheet 7 diffusing the drip in the planar direction, the back sheet 7 can more easily draw in even more drip from the intermediate sheet 5. Therefore, the drip sheet 1 has excellent water absorption and water retention capabilities. Furthermore, the drip sheet 1 has a backing sheet 7 that easily retains drip in an area far from the food, and also effectively prevents the drip from coming into contact with the food again. Therefore, the drip sheet 1 is effective in maintaining the freshness of food.

[0078] Because the back sheet 7 of the drip sheet 1 has predetermined wrinkles, when used in a food tray, a gap is easily formed between the surface of the food tray and the surface of the back sheet 7, and the surface of the back sheet 7 in the gap is able to easily hold drips due to surface tension. Therefore, the drip sheet 1 has excellent water absorption and water retention capabilities.

[0079] [Drip Sheet] The drip sheet according to this disclosure comprises, in that order, a liquid-permeable sheet for placing food, an intermediate sheet for absorbing drip originating from the food, and a back sheet, and has a planar direction and a thickness direction. The liquid-permeable sheet is composed of an open film having a plurality of through holes for allowing drip to pass through, and on which food is placed. The intermediate sheet is composed of first fibers, and the back sheet is composed of second fibers, and absorbs drip originating from the food. The fiber density of the second fibers in the back sheet is higher than the fiber density of the first fibers in the intermediate sheet.

[0080] When the drip sheet comes into contact with drip, the drip passes through the permeable sheet and moves to the intermediate sheet and the back sheet. Because the fiber density of the second fibers in the drip sheet is higher than that of the first fibers, the drip that has moved from the permeable sheet to the intermediate sheet is easily transferred to the back sheet. Furthermore, because the intermediate sheet transfers the drip to the back sheet, it is easier for the intermediate sheet to have enough capacity to draw in drip from the permeable sheet side, and therefore the drip sheet has excellent water absorption and water retention capabilities.

[0081] Generally, bacteria multiply in the drip released from food over time. When the drip comes into contact with food again, the increased bacteria reduce the food's freshness. Therefore, the longer the drip remains in the area of ​​the drip sheet closest to the food, the more likely the food is to lose freshness due to re-contact with the drip. Therefore, in the above-mentioned drip sheet, the second fiber has a predetermined fiber density. As a result, the back sheet can easily draw in and retain drip, so the drip sheet can easily retain drip in an area far from the food. This makes it easier for the drip sheet to suppress re-contact of drip with the food, thereby helping to maintain the freshness of the food.

[0082] Furthermore, because the drip sheet easily retains drip on the back sheet, even when food trays using the drip sheet are displayed at an angle in stores, it is difficult for the drip to flow back to the middle sheet. As a result, the drip sheet is able to suppress drip leakage from the back sheet, and therefore has excellent water retention capabilities. Therefore, the above-mentioned drip sheet has excellent water absorption and retention capabilities, and it is easy to prevent drips from coming into contact with food again, thus making it easier to maintain the freshness of food.

[0083] [Liquid-permeable sheet] In the drip sheet according to this disclosure, the liquid-permeable sheet is composed of an open film having a placement surface on which food is placed and a non-placement surface on the opposite side of the placement surface, and having a plurality of through holes for allowing drip to pass through. Preferably, the liquid-permeable sheet has a plurality of recesses on the non-placement surface that are recessed toward the placement surface. Furthermore, preferably the liquid-permeable sheet is hydrophobic so as not to absorb too much of the drip, which is mainly moisture from food.

[0084] Each of the above-mentioned multiple through-holes has a mounting surface opening located on the mounting surface and a non-mounting surface opening located on the non-mounting surface and in contact with the intermediate sheet, and is equipped with a liquid guide portion that connects the mounting surface opening and the non-mounting surface opening and allows drip to pass through. The mounting surface opening and the non-mounting surface opening serve as an inlet and outlet for drip seeping from food, respectively.

[0085] The drip sheet according to this disclosure is not particularly limited in terms of the shape of the mounting surface opening and the non-mounting surface opening of the liquid permeable sheet, and the cross-sectional shape of the bent portion in a direction perpendicular to the thickness direction of the liquid permeable sheet. For example, it may be an ellipse (e.g., an ellipse with a major axis and a minor axis, or a circle without a major axis and a minor axis), a polygon (e.g., a square, a pentagon, a hexagon, etc.), a polygon with rounded corners (e.g., a rectangle with rounded corners), etc. From the viewpoint that the liquid permeable sheet has a shell structure, it is preferable that the shape of the mounting surface opening and the non-mounting surface opening, and the cross-sectional shape of the bent portion are an ellipse or a polygon with rounded corners.

[0086] In the drip sheet relating to this disclosure, the plurality of through-holes can be arranged in any arrangement in the planar direction. For example, the plurality of through-holes can be arranged in a staggered pattern (e.g., 60° staggered, square staggered, etc.), a parallel pattern, etc. in the planar direction.

[0087] In the drip sheet according to this disclosure, the liquid-permeable sheet is configured such that the bent portion in each of the plurality of through-holes is bent inward when no food is placed on the drip sheet, that is, when no load is applied. Preferably, the bent portion is configured to bend further in the thickness direction of the drip sheet when a load is applied in the thickness direction of the drip sheet. This allows the liquid-conducting portion to easily deform at the predetermined bent portion in accordance with the movement of the food, that is, in accordance with the load, when a food tray having food and the drip sheet is transported, and to repeatedly recover from deformation.

[0088] In the drip sheet according to this disclosure, the bent portion in each of the plurality of through holes may have any bending angle in the thickness direction of the liquid permeable sheet, but preferably it has a bending angle of 30° or more, more preferably 50° or more, and even more preferably 70° or more. This is from the viewpoint that the liquid guiding portion is easily deformed with the bending portion as the starting point when a predetermined load is applied. Furthermore, the bending portion preferably has a bending angle of 160° or less, more preferably 140° or less, and even more preferably 120° or less. As a result, when a predetermined load is applied to the drip sheet, the bending portion is more easily bent, and therefore the liquid guiding portion is easily deformed.

[0089] The above-mentioned bending angle is the angle formed in the thickness direction of the liquid-permeable sheet by the portion of the fluid-conducting section between the above-mentioned mounting surface opening and the bending portion (first fluid-conducting section portion) and the portion between the bending portion and the non-mounting surface opening (second fluid-conducting section portion), and is indicated by θ in Figures 3 and 4. That is, in each of the multiple through-holes, the fluid-conducting section is divided into a first fluid-conducting section portion between the above-mentioned mounting surface opening and the bending portion, and a second fluid-conducting section portion between the bending portion and the non-mounting surface opening.

[0090] In the drip sheet according to this disclosure, the thickness of the first fluid-conducting portion (first thickness) and the thickness of the second fluid-conducting portion (second thickness) in each of the plurality of through-holes of the liquid-permeable sheet are arbitrary, but it is preferable that the thickness of the first fluid-conducting portion is greater than the thickness of the second fluid-conducting portion. The above-mentioned thickness relationship is preferably satisfied in a single cross-section of a hole obtained by cutting the through-hole with a plane that passes through the axis of the fluid guide portion and extends in the thickness direction of the drip sheet, between the midpoint between the above-mentioned mounting surface opening and the bent portion (specifically, the midpoint in the thickness direction of the drip sheet) and the midpoint between the above-mentioned bent portion and the non-mounting surface opening (specifically, the midpoint in the thickness direction of the drip sheet). As a result, when a predetermined load is applied to the drip sheet having the liquid-permeable sheet, the first fluid-conducting portion maintains its shape, while the second fluid-conducting portion is more easily deformed than the first fluid-conducting portion.

[0091] In the drip sheet according to this disclosure, the length in the thickness direction of the liquid permeable sheet in the first liquid guiding portion (first length) and the length in the thickness direction of the liquid permeable sheet in the second liquid guiding portion (second length) are arbitrary in each of the plurality of through holes, but it is preferable that the length in the thickness direction of the liquid permeable sheet in the first liquid guiding portion is longer than the length in the thickness direction of the liquid permeable sheet in the second liquid guiding portion. As a result, when a predetermined load is applied to the liquid permeable sheet, the first liquid guiding portion maintains its shape, while the second liquid guiding portion is more easily deformed than the first liquid guiding portion.

[0092] In the drip sheet according to this disclosure, the liquid-permeable sheet does not have to have the second liquid-conducting portion in each of the plurality of through-holes curved inward and outward, and may curve to protrude inward or outward, but it is preferable that it is curved to protrude inward. As a result, when a predetermined load is applied to the liquid-permeable sheet, the second liquid-conducting portion is easily deformed to increase the contact area with the intermediate sheet without changing the position of the portion closer to the non-mounting surface opening.

[0093] Furthermore, in the drip sheet according to this disclosure, the liquid-permeable sheet does not need to have the non-mounting surface openings in each of the plurality of through-holes fixed to the intermediate sheet. However, from the viewpoint of ensuring the above-mentioned effects, it is preferable that a part of the non-mounting surface openings is fixed to the intermediate sheet, for example, by adhesive. In addition, it is preferable that each of the non-mounting surface openings is fixed to the intermediate sheet at least two locations, and that the non-mounting surface openings are fixed to the intermediate sheet continuously or intermittently along their circumferential direction.

[0094] Thereby, in the liquid-permeable sheet described above, when a predetermined load is applied, the first liquid guiding portion section described above continues to maintain its shape, while the second liquid guiding portion section described above deforms more easily than the first liquid guiding portion section described above. Further, the drip sheet provided with the liquid-permeable sheet described above is such that when a predetermined load is applied, the second liquid guiding portion section deforms more easily than the first liquid guiding portion section, so that the food product can be separated from the intermediate sheet described above, and re-contact of drip with the food product is easily suppressed, whereby the freshness of the food product is easily maintained.

[0095] In the drip sheet according to the present disclosure, the liquid-permeable sheet described above has the plurality of through-hole portions described above in the planar direction, preferably at 200 to 400 pieces / cm 2 , more preferably 250 to 350 pieces / cm 2 , and even more preferably 270 to 330 pieces / cm 2 It is preferable to have a number density of. Thereby, the drip sheet described above can reliably transfer a small amount of drip exuded from the food product to the intermediate sheet described above.

[0096] In the drip sheet according to the present disclosure, in the liquid-permeable sheet described above, each of the bent portions of the plurality of through-hole portions described above is preferably 0.01 to 0.10 mm 2 / piece, more preferably 0.02 to 0.08 mm 2 / piece, and even more preferably 0.03 to 0.07 mm 2 / piece in area. Thereby, the drip exuded from the food product does not stay in the liquid-permeable sheet described above, and easily transfers to the intermediate sheet described above. As a result, the drip sheet described above can draw in more drip from the food product, and thus is excellent in water absorption capacity.

[0097] In the drip sheet according to this disclosure, the liquid-permeable sheet has a bending portion opening ratio of the plurality of through-holes, preferably 12-23%, more preferably 15-20%, and even more preferably 16-19% in terms of area. As a result, the drip sheet reliably transfers small amounts of drip seeped from food to the intermediate sheet, while ensuring the rigidity of the liquid-permeable sheet and separating the food from the intermediate sheet, thereby making it easier to suppress re-contact of the drip with the food and thus easier to maintain the freshness of the food. The area of ​​the bending portion and the bending portion opening ratio can be measured by the "Method for measuring the area of ​​the bending portion and the bending portion opening ratio" described later.

[0098] <Method for measuring the area of ​​the bent section and the opening ratio of the bent section> The area of ​​the bent portion and the opening ratio of the bent portion are measured using the following procedure. (1) Prepare a VHX-2000 microscope manufactured by Keyence Corporation. (2) Using the above microscope, an image of the mounting surface of the liquid permeable sheet of the drip sheet is taken from the thickness direction. (3) Using the included software, the area of ​​each individual bend is measured at a total of 100 locations, and the average value is adopted as the area of ​​the bend. (4) The bending area opening ratio is calculated by dividing the "total area of ​​the bending portion in the measurement area" by the "area of ​​the liquid-permeable sheet in the measurement area".

[0099] In the drip sheet according to this disclosure, the material of the liquid-permeable sheet can be any material used as a liquid-permeable sheet in the art, such as a thermoplastic resin, without any particular limitations. Examples of such materials include polyolefins (e.g., polypropylene, polyethylene), polyethylene terephthalate, and ethylene vinyl acetate copolymer. The material is preferably a polyolefin, and more preferably polyethylene.

[0100] [Intermediate Sheet] The intermediate sheet according to this disclosure is composed of first fibers. The first fibers preferably include pulp fibers and heat-fusible fibers. The pulp fibers and heat-fusible fibers are preferably airlaid nonwoven fabrics. The heat-fusible fibers preferably form a three-dimensional network structure through interfiber bonding. Furthermore, the pulp fibers are preferably held within the three-dimensional network structure. The intermediate sheet has a three-dimensional network structure formed by the heat-fusible fibers. Therefore, the intermediate sheet facilitates the transfer of drip to the back sheet. As a result, the drip sheet having the intermediate sheet makes it easier to secure the amount of drip that can be drawn from the liquid-permeable sheet to the intermediate sheet, and the drip sheet having the intermediate sheet has excellent water absorption and water retention capabilities.

[0101] Furthermore, in the above-mentioned drip sheet, the pulp fibers are held together by the heat-fusible fibers. Therefore, compared to a drip sheet in which pulp fibers are bonded together using a binder component (e.g., latex), the pulp fibers in the above-mentioned drip sheet exhibit greater water absorption capacity. As a result, the above-mentioned drip sheet has excellent water absorption and water retention capabilities.

[0102] The intermediate sheet according to this disclosure preferably contains 40% by mass or more of the pulp fibers, more preferably 50% by mass or more. The intermediate sheet according to this disclosure preferably contains 80% by mass or less of the pulp fibers, more preferably 70% by mass or less. The intermediate sheet according to this disclosure preferably contains 20% by mass or more of the heat-fusible fibers, more preferably 30% by mass or more. The intermediate sheet according to this disclosure preferably contains 60% by mass or less of the heat-fusible fibers, more preferably 50% by mass or less.

[0103] As a result, the intermediate sheet contains the heat-fusible fibers and the pulp fibers in a predetermined ratio. Therefore, a drip sheet having the intermediate sheet has excellent water retention capacity because it is easy to ensure the thickness of the intermediate sheet. Furthermore, the drip sheet having the intermediate sheet makes it easier to retain the drip that has migrated to the back sheet in an area far from the food, and also makes it easier to suppress the drip from coming into contact with the food again, by ensuring the thickness of the intermediate sheet. As a result, the drip sheet having the intermediate sheet makes it easier to maintain the freshness of the food.

[0104] Furthermore, since the drip sheet equipped with the above-mentioned intermediate sheet contains the heat-fusible fibers in a predetermined ratio, the three-dimensional network structure of the heat-fusible fibers makes it easier to support the pulp fibers, and the heat-fusible fibers make it easier to hold the pulp fibers. As a result, the drip sheet equipped with the above-mentioned intermediate sheet makes it easier to suppress the fuzzing and shedding of the pulp fibers, thereby making it easier for the pulp fibers to exhibit their water absorption and water retention capabilities, and thus having excellent water absorption and water retention capabilities. The above-mentioned heat-fusible fibers can be used in this art without any particular limitations, as long as they form a three-dimensional network structure.

[0105] From the above viewpoint, the first fibers constituting the intermediate sheet preferably contain more than 50% by mass, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably more than 90% by mass, even more preferably 95% by mass or more, and even more preferably 100% by mass of the pulp fibers and the heat-fusible fibers (i.e., the first fibers consist of the pulp fibers and the heat-fusible fibers). Furthermore, if the first fiber includes fibers other than the pulp fiber and the heat-fusible fiber, it is preferable that the first fiber includes, for example, regenerated cellulose fiber (rayon, cupro, etc.).

[0106] The thickness of the intermediate sheet according to this disclosure is preferably 700 μm or more, and more preferably 800 μm or more. Furthermore, the thickness of the intermediate sheet according to this disclosure is preferably 1000 μm or less, and more preferably 900 μm or less.

[0107] The intermediate sheet according to this disclosure preferably has fibers (protruding fibers) that extend toward the mounting surface in the thickness direction and that enter into recessed portions. That is, the recessed portions in the liquid-permeable sheet preferably house protruding fibers that extend from the non-mounting surface side toward the mounting surface side in the thickness direction, passing through recessed openings that open toward the non-mounting surface side.

[0108] Since the fiber density of the backing sheet according to this disclosure is higher than that of the intermediate sheet, drip that has migrated to the intermediate sheet is drawn into the backing sheet, causing it to migrate from the liquid-permeable sheet side (upper layer of the intermediate sheet) to the backing sheet side (lower layer of the intermediate sheet). On the other hand, if a large amount of drip has migrated to the intermediate sheet and cannot be completely transferred to the backing sheet, the drip tends to remain on the liquid-permeable sheet side within the intermediate sheet (see Figure 6). The fiber density of the intermediate sheet and the backing sheet is measured by the "Method for Measuring Fiber Density" described later.

[0109] <Method for measuring fiber density> The fiber density of the object to be measured (intermediate sheet or backing sheet) is measured according to the following procedure. (1) Cut the drip sheet containing the object to be measured into a 10 mm x 10 mm size in a planar direction parallel to the thickness direction to prepare the sample. (2) Using a scanning electron microscope (e.g., VE-7800 manufactured by Keyence Corporation), the cross-section of the sample is magnified (e.g., 30 to 500 times) and photographed. (3) Visually demarcate both ends of the object to be measured in the thickness direction in the photographed cross-section, and measure the length of the object in the thickness direction. (4) Among the objects to be measured, which are divided in the thickness direction, a section with a length of 1 mm is defined at any position in the direction perpendicular to the thickness direction (width direction). (5)Calculate the area of ​​the region (measurement area) for measuring the fiber density number, which is partitioned in (3) and (4). (6) Measure the number of fibers with cross-sections within the measurement area. (7) The number of fibers measured in (6) is divided by the area of ​​the measurement region calculated in (5) to obtain the fiber density (fibers / mm²). 2 ) Fiber density is the number of fibers per unit area that have a cross-sectional area.

[0110] The intermediate sheet according to this disclosure has a fiber density of preferably 65 fibers / mm² in a cross-section parallel to the thickness direction. 2 The above is preferable to 75 lines / mm 2 The above is preferable to 85 strands / mm 2 That's all. Furthermore, the intermediate sheet according to this disclosure has a fiber density of preferably 135 fibers / mm² in a cross-section parallel to the thickness direction. 2 The following is more preferable: 115 strands / mm 2 The following is more preferably 95 strands / mm 2 The following applies:

[0111] The drip sheet having the liquid-permeable sheet and the intermediate sheet has protruding fibers that pass through the recessed openings and extend from the intermediate sheet, making it easy to draw in drip along these protruding fibers. Therefore, when the drip sheet having the liquid-permeable sheet and the intermediate sheet absorbs a large amount of drip, it is easier to retain the drip in the recessed area along the protruding fibers, and the intermediate sheet is able to easily secure the capacity to draw in drip from the mounting surface side of the liquid-permeable sheet. As a result, the drip sheet having the liquid-permeable sheet and the intermediate sheet has excellent water absorption and water retention capabilities.

[0112] Furthermore, in the liquid-permeable sheet described above, since the recessed portion does not penetrate in the thickness direction, the drip held in the recessed portion is less likely to flow back onto the surface described above. Therefore, even when a large amount of drip is absorbed, the drip sheet comprising the liquid-permeable sheet and the intermediate sheet is more effective at preserving the freshness of food by suppressing the drip from coming into contact with the food again.

[0113] [Backside sheet] The backing sheet according to this disclosure preferably contains hydrophilic fibers as the second fibers constituting the backing sheet. As a result, the backing sheet has excellent water absorption and water retention capabilities, and facilitates the drawing of drip from the intermediate sheet. Therefore, a drip sheet having the backing sheet has excellent water absorption and water retention capabilities. From the above viewpoint, the second fiber preferably contains more than 50% by mass, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably more than 90% by mass, even more preferably 95% by mass or more, and even more preferably 100% by mass of the hydrophilic fiber (i.e., the second fiber consists of the hydrophilic fiber). Furthermore, if the second fiber includes fibers different from the hydrophilic fiber, it is preferable that the second fiber includes, for example, synthetic fibers (e.g., polypropylene) that have not undergone the hydrophilization treatment described later.

[0114] The hydrophilic fibers mentioned above include hydrophilic fibers and hydrophilized synthetic fibers (e.g., polypropylene). The hydrophilized synthetic fibers mentioned above are synthetic fibers containing a hydrophilizing agent, and include, for example, synthetic fibers formed by mixing a hydrophilizing agent into the synthetic fiber material during manufacturing and then spinning it, in other words, synthetic fibers into which a hydrophilizing agent has been kneaded.

[0115] In the hydrophilic fibers included as the second fiber in the back sheet, it is preferable that the mass percentage of the hydrophilized synthetic fiber is 100% by mass. Furthermore, it is preferable that the synthetic fiber that undergoes hydrophilization treatment in the back sheet is polypropylene.

[0116] Alternatively, instead of kneading the hydrophilizing agent into the synthetic fiber material, the fibers of the backing sheet may be made hydrophilic by coating the nonwoven fabric formed from synthetic fibers (for example, spunbond nonwoven fabric or meltblown nonwoven fabric) with a hydrophilizing agent (post-processing). The hydrophilizing agent used in the post-processing and the hydrophilizing agent used in the kneading can be any hydrophilizing agent that is commonly used in the art, and there are no particular restrictions on which can be used. Examples of hydrophilizing agents used in the post-processing and the hydrophilizing agent used in the kneading include anionic hydrophilizing agents, cationic hydrophilizing agents, nonionic hydrophilizing agents, and combinations thereof, and nonionic hydrophilizing agents are preferred due to their high heat resistance.

[0117] The hydrophilizing agent used in the above post-processing and the hydrophilizing agent used in the above kneading may be the same or different. Specific examples of fibers that are hydrophilic without a hydrophilizing agent include natural cellulose fibers (e.g., pulp) and regenerated cellulose fibers (rayon, cupro, etc.).

[0118] The fiber density of the second fibers in the backing sheet according to this disclosure is preferably at least twice, more preferably at least three times, and even more preferably at least five times higher than the fiber density of the first fibers in the intermediate sheet. In a drip sheet equipped with the backing sheet, the backing sheet has a predetermined fiber density. Therefore, a drip sheet equipped with the backing sheet facilitates the transfer of drip from the intermediate sheet to the backing sheet by capillary action, and also facilitates further drawing of drip into the backing sheet without causing it to stagnate in the intermediate sheet. As a result, a drip sheet equipped with the backing sheet has excellent water absorption capacity.

[0119] Furthermore, a drip sheet equipped with the above-mentioned backing sheet can easily retain the drip that has migrated to the backing sheet in an area far from the food, and can also easily suppress the drip from coming into contact with the food again. Therefore, a drip sheet equipped with the above-mentioned backing sheet can easily maintain the freshness of food.

[0120] The back sheet according to this disclosure has a fiber density of hydrophilic fibers in a cross-section parallel to the thickness direction, preferably 200 fibers / mm². 2 The above is more preferable, with a minimum of 340 strands / mm 2 The above is preferable, and more preferably 480 strands / mm 2 That concludes the information. Furthermore, the back sheet according to this disclosure has a fiber density of hydrophilic fibers in a cross-section parallel to the thickness direction, preferably 600 fibers / mm². 2 The following, and more preferably 550 strands / mm 2 The following, and more preferably 500 strands / mm 2 The following applies: The fiber density of the back sheet is measured according to the "Method for Measuring Fiber Density" described above.

[0121] The backing sheet described above contains hydrophilic fibers of a predetermined fiber density. Therefore, the drip sheet having the backing sheet has excellent water absorption and water retention capabilities, and also facilitates the drawing of drip from the intermediate sheet. As described above, the drip sheet has excellent water absorption and water retention capabilities.

[0122] Generally, when drip sheets used in food trays are displayed at an angle in a store, the drip held by the drip sheet may be released and come into contact with the food again. Therefore, the drip sheet according to this disclosure has a back sheet composed of hydrophilic fibers with a predetermined fiber density. Consequently, the back sheet easily exhibits water absorption and water retention in both the planar and thickness directions, and the drip sheet according to this disclosure easily retains drip in an area far from the food, even when food trays are displayed at an angle. As a result, the drip sheet easily maintains the freshness of food.

[0123] The length (thickness) in the thickness direction of the back sheet according to this disclosure is preferably 50 μm or more, more preferably 80 μm or more, and even more preferably 90 μm or more. Furthermore, the length (thickness) in the thickness direction of the back sheet according to this disclosure is preferably 150 μm or less, more preferably 120 μm or less, and even more preferably 100 μm or less.

[0124] In the drip sheet according to this disclosure, the intermediate sheet and the back sheet absorb and retain drip. When the fiber density of the intermediate sheet is higher than that of the back sheet, and the intermediate sheet is thicker than the back sheet, the drip sheet is more likely to retain drip in the layer below the drip-retaining area. In other words, in the drip sheet according to this disclosure, it is preferable that the intermediate sheet is longer (thicker) in the thickness direction than the back sheet. A drip sheet equipped with the above-mentioned intermediate sheet can easily retain the drip that has migrated to the back sheet in an area far from the food, and can also easily suppress the drip from coming into contact with the food again. As a result, it is easier to maintain the freshness of the food.

[0125] The backing sheet according to this disclosure preferably contains multiple types of fibers with different fineness (fiber weight per 10,000 m), that is, fibers with relatively high fineness and fibers with relatively low fineness. Furthermore, the drip sheet having the above backing sheet preferably consists of multiple layered structures in which sheets with relatively high fineness (high-fineness sheets) and sheets with relatively low fineness (low-fineness sheets) overlap in the thickness direction. The relatively fine fibers mentioned above easily maintain the structure of the backing sheet, and the drip that has moved to the backing sheet is easily diffused throughout the backing sheet by capillary action through the relatively fine fibers, allowing the backing sheet to easily absorb and retain the drip. Therefore, the drip sheet having the above backing sheet has excellent water absorption and water retention capabilities.

[0126] Furthermore, the drip sheet having the above-mentioned backing sheet is more effective at retaining drip in an area far from the food, as the backing sheet easily holds the drip, and also helps to prevent the drip from coming into contact with the food again. Therefore, the above-mentioned drip sheet is more effective at maintaining the freshness of food. The fineness of the fibers that make up the backing sheet can be determined according to the "Freshness Measurement Method" described later.

[0127] <Method for measuring fineness> The fineness of the backing sheet is measured according to the following procedure. The backing sheet used is one that has been peeled off from the drip sheet. (1) Cut the back sheet into a 10mm x 10mm size in the planar direction parallel to the thickness direction to obtain the sample. (2) Place the sample on the slide, add an appropriate amount of glycerin to the sample so that the entire sample is immersed in glycerin, and then place a coverslip on top. (3) Observe the surface of the sample at a magnification of 1000x using an optical microscope (VHC-100 Digital Microscope Lens VH-Z450 manufactured by Keyence Corporation). (4) Measure the fiber diameter of the fibers exposed on the surface of the sample at 50 locations and use the average value as the average fiber diameter. (5) The average fiber diameter and resin density calculated in (4) (Example: Polypropylene 0.91 g / cm³) 3 Based on this, the fiber weight per 10,000m (Dtex = g / 10,000m) is calculated and used as the fineness.

[0128] The backing sheet according to this disclosure preferably includes a spunbond nonwoven fabric. Spunbond nonwoven fabrics are generally composed of predetermined long fibers. Therefore, in the above-mentioned drip sheet, the backing sheet facilitates the diffusion of drip through the long fibers, and also facilitates the further absorption of drip. As a result, the drip sheet having the above-mentioned backing sheet has excellent water absorption and water retention capabilities.

[0129] Furthermore, the drip sheet having the above-mentioned backing sheet is more effective at retaining drip in an area far from the food, and also at preventing the drip from coming into contact with the food again. Therefore, the drip sheet having the above-mentioned backing sheet is more effective at maintaining the freshness of the food. Furthermore, if one of the multiple types of fibers with different fineness in the back sheet is a long fiber (first long fiber) constituting the spunbond nonwoven fabric, it is preferable that the fiber with a different fineness from the first long fiber is a long fiber (second long fiber) constituting the meltblown nonwoven fabric.

[0130] The backing sheet containing the spunbond nonwoven fabric may have a three-layer structure, in which case an SMS nonwoven fabric (spunbond-meltblown-spunbond nonwoven fabric) containing the meltblown nonwoven fabric as the low-fiber sheet is provided. The backing sheet containing the spunbond nonwoven fabric may have a four-layer structure, in which case an SMMS nonwoven fabric (spunbond-meltblown-meltblown-spunbond nonwoven fabric) containing the meltblown nonwoven fabric as the low-fiber sheet is provided. In addition to the spunbond nonwoven fabric and the meltblown nonwoven fabric mentioned above, the SMS nonwoven fabric and the SMMS nonwoven fabric can be used without any particular restrictions, as long as they are commonly used in the art.

[0131] The back sheet according to this disclosure preferably has a plurality of embossed portions that are compressed in the thickness direction. The bottom of the plurality of embossed portions is a high-density portion where the fiber density is higher than that of the parts of the back sheet other than the embossed portions due to compression. In addition, the plurality of embossed portions form a gap between the intermediate sheet and the back sheet. As a result, the drip sheet having the above-mentioned backing sheet has the above-mentioned multiple embossing, which makes it easier to draw in the drip. Therefore, the above-mentioned drip sheet has excellent water absorption and water retention capabilities. The above-mentioned multiple embossing portions are formed on the backing sheet in any pattern in the planar direction, for example, dots or concentric circles.

[0132] In the drip sheet relating to this disclosure, the intermediate sheet is an airlaid pulp nonwoven fabric and is therefore relatively less prone to stretching, while the back sheet is a laminated sheet containing the spunbond nonwoven fabric and is therefore relatively more prone to stretching. The intermediate sheet and the back sheet are joined by applying an adhesive while tension is applied in the planar direction to eliminate slack. After joining, the tension applied in the planar direction to the intermediate sheet and the back sheet is removed.

[0133] Because the backing sheet is relatively stretchable, after joining, the fibers in the backing sheet that were stretched in the planar direction at the time of joining will contract due to the tension. On the other hand, because the intermediate sheet is relatively less stretchable, wrinkles may form in the backing sheet due to the difference in stretchability between the backing sheet and the intermediate sheet.

[0134] Furthermore, if the back sheet is subjected to tension in any one direction in the planar direction, such as the transport direction during manufacturing, and joined to the intermediate sheet, multiple wrinkles may occur in a direction perpendicular to that arbitrary direction.

[0135] In the drip sheet according to this disclosure, it is preferable that the back sheet has a plurality of wrinkles extending in the planar direction. In this case, the plurality of wrinkles are provided on at least one of the inner surface of the back sheet, which is the side facing the intermediate sheet, and the outer surface of the back sheet, which is the side opposite to the inner surface of the back sheet in the thickness direction. Drip that comes into contact with the plurality of wrinkles is easily diffused along the plurality of wrinkles.

[0136] A drip sheet having the multiple wrinkles on the inner surface of the back sheet has a gap between the intermediate sheet and the back sheet. Similarly, a drip sheet having the multiple wrinkles on the outer surface of the back sheet has a gap between the back sheet and an object in contact with the outer surface of the back sheet, such as a food tray. Drip that has moved onto the back sheet diffuses in a planar direction by traveling through the gaps caused by the multiple wrinkles on the inner surface of the back sheet and / or the gaps caused by the multiple wrinkles on the outer surface of the back sheet. In other words, if the multiple wrinkles are on the inner surface of the back sheet, the drip diffuses more easily on the inner surface side of the back sheet, and if the multiple wrinkles are on the outer surface of the back sheet, the drip diffuses more easily on the outer surface side of the back sheet.

[0137] Therefore, the back sheet facilitates the diffusion of the drip drawn into it in a planar direction, and as a result of the back sheet diffusing the drip in a planar direction, the back sheet becomes more able to draw in even more drip from the intermediate sheet. Consequently, the drip sheet having the back sheet has excellent water absorption and water retention capabilities. Furthermore, the drip sheet having the above-mentioned backing sheet is more effective at retaining drip in an area far from the food, and also more effective at preventing the drip from coming into contact with the food again. Therefore, the drip sheet having the above-mentioned backing sheet is more effective at maintaining the freshness of the food.

[0138] When the drip sheet described above, which has multiple wrinkles on the outer surface of the backing sheet, is used in a food tray, a gap is more likely to form between the surface of the food tray and the outer surface of the backing sheet, and the outer surface of the backing sheet in the gap is more likely to retain drip due to surface tension. Therefore, the drip sheet has excellent water absorption and water retention capabilities.

[0139] [glue] In the drip sheet according to this disclosure, it is preferable that the liquid-permeable sheet and the intermediate sheet adjacent to the liquid-permeable sheet are joined by a first joint. The first joint is an adhesive layer formed, for example, by coating the liquid-permeable sheet and / or the intermediate sheet with a hot-melt adhesive so as to extend in a predetermined shape (e.g., spiral, omega, or stripe) in any one direction in the planar direction, and spaced apart to a predetermined extent in a direction perpendicular to the aforementioned one direction in the planar direction.

[0140] In the drip sheet according to this disclosure, it is preferable that the intermediate sheet and the back sheet adjacent to the intermediate sheet are joined by a second joint. The second joint is, for example, an adhesive layer formed by coating the liquid-permeable sheet and / or intermediate sheet with a hot-melt adhesive so as to extend in a predetermined shape (e.g., spiral, omega, or stripe) in any one direction in the planar direction, and spaced apart to a predetermined extent in a direction perpendicular to the aforementioned one direction in the planar direction. [Examples]

[0141] The present disclosure will be described below based on examples, but is not limited to these examples. In the examples, fiber density measurement tests were performed on drip sheets.

[0142] In the example, the following "(a) Drip sheet of Example 1" was used as a sample, and the following "(b) Fiber density measurement test" was performed. Furthermore, the bonding of (i) the liquid permeable sheet and (ii) the intermediate sheet, and the bonding of (ii) the intermediate sheet and (iii) the backing sheet were both achieved by coating with hot melt adhesive in an Ω-shaped pattern.

[0143] (a) Drip sheet of Example 1 (i) Liquid permeable sheet Sheet composition: Perforated film Composition resin: Polyethylene 100% by mass Through-hole density: 270-330 holes / cm² 2 (ii) Intermediate sheet Sheet composition: Airlaid pulp nonwoven fabric Composition: Pulp fiber 60% by mass, polypropylene 40% by mass Binder ingredients: Not used (iii) Backing sheet Sheet composition: SMS nonwoven fabric Composition: Hydrophilic treated polypropylene 100% by mass Hydrophilization treatment method: Incorporation of a hydrophilizing agent during fiber manufacturing. Hydrophilic agent: Nonionic hydrophilic agent

[0144] (b) Fiber density measurement test The fiber density measurement test was conducted to measure the fiber density of the intermediate sheet and back sheet in the sample of Example 1, in accordance with the "Method for Measuring Fiber Density" described above. Figure 9 is an SEM image taken at 50x magnification of a cross-section parallel to the thickness direction of the drip sheet of Example 1. In the fiber density measurement test, the measurement area Ra of the intermediate sheet and the measurement area Rb of the back sheet were defined from the SEM image in Figure 9, and the number of fibers in each measurement area was calculated.

[0145] In the intermediate sheet of Example 1, the thickness Ta of the measurement area Ra was 0.853 mm. The area of ​​the measurement area Ra is 0.853 mm, since the length in the lateral direction is 1 mm and the thickness Ta is 0.853 mm. 2 The number of fibers in the cross-section of the measurement area Ra was 45. Therefore, the fiber density of the intermediate sheet in Example 1 was "77 fibers" to "0.853 mm²". 2 The value obtained by dividing by " is "90.3 pieces / mm 2 " was the case.

[0146] In the back sheet of Example 1, the thickness Tb of the measurement area Rb was 0.095 mm. The area of ​​the measurement area Rb is 0.095 mm, since the length in the horizontal direction is 1 mm and the thickness Tb is 0.095 mm. 2 The number of fibers in the cross-section of the measurement area Rb was 45. Therefore, the fiber density of the back sheet in Example 1 was "46 fibers" to "0.095 mm²". 2 The value obtained by dividing by " is "484.2 pieces / mm 2 " was the case.

[0147] Based on the above, in the drip sheet of Example 1, the fiber density of the backing sheet was higher than that of the intermediate sheet. Furthermore, the value obtained by dividing the fiber density of the backing sheet by the fiber density of the intermediate sheet was "5.36", indicating that the fiber density of the backing sheet was more than five times higher than that of the intermediate sheet.

[0148] As a result, the drip sheet of Example 1 is thought to facilitate the transfer of drip from the intermediate sheet to the back sheet through capillary action, and to further draw the drip into the back sheet without causing it to stagnate in the intermediate sheet. Therefore, the drip sheet of Example 1 is thought to have excellent water absorption capacity. Furthermore, since the drip sheet of Example 1 is thought to easily draw drips into the back sheet, it is thought to be able to keep the drips away from the food and to suppress the drips from coming into contact with the food again. Therefore, the drip sheet of Example 1 is thought to be able to easily maintain the freshness of food.

[0149] Furthermore, the value obtained by dividing the thickness Ta of the intermediate sheet by the thickness Tb of the backing sheet was 8.98, indicating that the thickness of the intermediate sheet was more than 8 times greater than the thickness of the backing sheet.

[0150] As a result, the drip sheet of Example 1 is thought to be able to easily retain the drip drawn into the back sheet in an area far from the food, and to easily suppress the drip from coming into contact with the food again. Therefore, the drip sheet of Example 1 is thought to be able to easily maintain the freshness of the food. [Explanation of symbols]

[0151] 1 Drip Sheet 3. Liquid-permeable sheet 5 Intermediate seats 7. Back sheet 9 Mounting surface 11 Non-mounting surface 13 Through hole 15. Recessed area 17 Mounting surface opening 19 Non-mounting surface opening 21 Liquid guide part 23 Recessed opening 25. Bending section 27 1st liquid guide part 29 2nd liquid guide part 31 Protruding Fibers 41 Backside of the sheet 43. Outer surface of the back sheet 45 Spunbond Sheets 47 Meltblown Sheet 49 Embossed part 51 High density area 53 wrinkles 101 Food 103 Drip L1 First length L2 Second length T (thickness direction) T1 First Thickness T2, second thickness Thickness Tb thickness P plane direction Ra measurement field Rb determination field

Claims

1. A drip sheet comprising, in that order, a liquid-permeable sheet for placing food on, an intermediate sheet for absorbing drips from the food, and a back sheet, and having both a planar direction and a thickness direction, The liquid-permeable sheet is composed of an open film having multiple through-holes for allowing the drip to pass through. The aforementioned intermediate sheet is composed of first fibers, The aforementioned back sheet is composed of a second fiber, The fiber density of the second fibers in the back sheet is higher than the fiber density of the first fibers in the intermediate sheet. Drip sheet.

2. The intermediate sheet is an airlaid nonwoven fabric containing pulp fibers and heat-fusible fibers as the first fibers. The heat-fusible fibers form a three-dimensional network structure through inter-fiber bonding. The pulp fibers are held within the three-dimensional network structure. The drip sheet according to claim 1.

3. The intermediate sheet contains the pulp fibers and the heat-fusible fibers in proportions of 40 to 80% by mass and 20 to 60% by mass, respectively. The drip sheet according to claim 2.

4. The fiber density of the second fibers in the back sheet is at least twice the fiber density of the first fibers in the intermediate sheet. The drip sheet according to claim 1.

5. The back sheet contains hydrophilic fibers as the second fiber, The aforementioned backing sheet has a cross-section parallel to the thickness direction, with the hydrophilic fibers arranged at a density of 200 fibers / mm². ２ Contains the above fiber density, The drip sheet according to claim 4.

6. The intermediate sheet is thicker than the back sheet. The drip sheet according to claim 1.

7. The liquid-permeable sheet has a surface on which food is placed and a non-placement surface on the opposite side of the surface on which food is placed. The liquid-permeable sheet has a plurality of recesses on the non-mounting surface that are recessed toward the mounting surface described above. The first fibers of the intermediate sheet extend toward the aforementioned surface in the thickness direction and include fibers that penetrate into the recessed portion. The drip sheet according to claim 1.

8. The second fiber of the backing sheet includes multiple types of fibers with different finenesses. The drip sheet according to claim 1.

9. The back sheet has a plurality of embossed portions that are compressed in the thickness direction. The drip sheet according to claim 8.

10. The aforementioned backing sheet includes a spunbond nonwoven fabric. The drip sheet according to claim 8.

11. The back sheet has a plurality of wrinkles extending in the planar direction. The drip sheet according to claim 10.

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