JP2019094071A - Drip sheet for fresh food and tray with use thereof - Google Patents

Abstract

To provide a drip sheet for fresh food which has a desired drip liquid-absorbing performance and can further improve an appearance of a food by a three-dimensional design, and a tray with use of the same.SOLUTION: A drip sheet 10 has a two-layer sheet structure including an upper layer sheet, which is formed from a film having plural apertures, and a lower layer sheet which is formed from a fiber non-woven cloth including water absorption fibers. A flexural rigidity of the upper layer sheet by a KES method is lower than a flexural rigidity of the lower layer sheet by a KES method. This drip sheet has: an arrangement area 20 in which a fresh food 2 is arranged; a deformation area 30 which is positioned alongside the arrangement area 20 in a first direction; and a virtual boundary line 18 between the arrangement area 20 and the deformation area 30. The deformation area 30 has at least one sharp part 33, and a contour line 30a of the deformation area 30 is a curved or bent line.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drip sheet having a liquid absorption property, and more particularly to a drip sheet suitable for absorbing drips exuding from fresh food such as meat and a tray using the same.

  Conventionally, a sheet for absorbing drips exuding from cut pieces of fish meat or small pieces of beef placed in a tray made of expanded polystyrene or the like is generally known. For example, Patent Document 1 discloses a drip sheet having a two-layer sheet structure in which a liquid-pervious thermoplastic plastic film in which an upper-layer sheet has a plurality of apertures and a lower-layer sheet is a liquid-absorbent fibrous nonwoven fabric There is.

JP 2002-302182 A

  In the drip sheet disclosed in Patent Document 1, the upper layer sheet is made of a liquid-permeable thermoplastic film, so that the drip exuded from the food contacts the entire food for a relatively long time to be discolored. You can control the

  However, by positioning the entire drip sheet on the bottom of the tray, the entire sheet is covered in a state where fresh food is disposed. Therefore, when eating fresh food, there is a risk of accidentally eating into the mouth along with the fresh food. Moreover, since it does not have decorativeness as a whole, even if it is in the state in which a part of drip sheet was exposed, the designability which improves the appearance of fresh food can not be exhibited.

  On the other hand, there is also known a drip sheet arranged so that a design part such as a large leaf shape is exposed in order to improve the appearance of a part of the sheet from fresh food in the tray, for example, food. In this case, since the whole bottom of the fresh food is not covered, there is a possibility that a part of the fresh food may be in direct contact with the sashimi tooth or the like to reduce the freshness.

  In the present invention, it is an improvement of a conventional drip sheet for perishable food, and it is an object of the present invention to provide a drip sheet which has a required drip suction performance and can improve the appearance of food by a three-dimensional design. There is.

  In order to solve the above-mentioned subject, the 1st invention of this application relates to the drip sheet for the perishable food which has the upper surface and the undersurface, and the 2nd direction which intersects the 1st direction and the 1st direction.

  According to a first aspect of the present invention, there is provided a two-layer sheet structure comprising an upper layer sheet formed of a film having a plurality of apertures and a lower layer sheet formed of a fibrous non-woven fabric containing water absorbent fibers. The flexural rigidity by the KES method is lower than the flexural rigidity by the KES method of the lower layer sheet, and a disposition region in which the fresh food is disposed, a deformation region located in parallel to the disposition region in the first direction, and the disposition region An outline of the deformation area between opposing edges facing each other in the second direction of the drip sheet, having a virtual boundary line with the deformation area, and the deformation area having at least one sharpened portion The line is characterized in that it is curved or bent.

The first invention of the present application includes the following preferred embodiments in addition to the above-described features.
(1) In a state where the fresh food is placed on the upper surface, the deformation region is curled by absorbing the drip on or in the vicinity of the boundary line.
(2) The outline of the deformation area has at least one inflection point.
(3) The outline of the deformation area is a zigzag or sawtooth shape formed of a plurality of protrusions.
(4) The deformation area has a triangular decorative portion whose base is the whole or a part of the boundary line, and the internal angle of the decorative portion is an acute angle.
(5) The water absorption of the lower layer sheet is 2.0 to 10.0 mm.
(6) The upper layer sheet is a thermoplastic synthetic resin film formed of polyethylene, and the lower layer sheet is an air-laid fiber nonwoven fabric containing pulp fibers.
(7) The pulp fibers of the air-laid fiber non-woven fabric are bonded to each other through an adhesive using a styrenic elastomer.

  A second invention of the present application is directed to a fresh food tray using a drip sheet.

  The tray according to the second aspect of the present invention has a bottom wall on which a drip sheet having the fresh food disposed on the upper surface is laid, and a peripheral wall standing up from the outer peripheral edge of the bottom wall, It is characterized in that it is located on the peripheral wall.

  In one embodiment of the tray according to the second invention, the area of the arrangement area of the drip sheet is 70 to 95% of the area of the bottom wall.

  In the drip sheet according to the present invention, the upper layer sheet formed of the apertured film prevents the drip from being in direct contact with the fresh food, thereby maintaining freshness and preventing discoloration. In addition, since the deformation area is curled by the absorption of drips by the lower layer sheet made of the liquid absorbent fibrous nonwoven fabric, the design property is improved and the appearance of fresh food is improved.

The perspective view which shows the use condition of the drip sheet for perishables concerning the present invention. The top view of a drip sheet. Sectional drawing in alignment with the III-III line of FIG. The side view in the state which mounted the drip sheet | seat on the mounting surface with a smooth surface, mounted fresh food on the upper surface, and left still for 5 minutes. (A) The top view of the drip sheet in an example of an Example. (B) The top view of the drip sheet in an example of another Example. (C) The top view of the drip sheet in one example of other Example. (A) The top view of the drip sheet in one example of other Example. (B) The top view of the drip sheet in one example of other Example. The top view of the drip sheet in another example of another Example.

  The following embodiment relates to the drip sheet 10 shown in FIGS. 1 to 7 and includes not only the essential configuration of the invention but also optional and preferable configurations. In each of the drawings, for convenience of explanation, the upper surface 3 of the drip sheet 10 is lightly colored, and one of the inner angles of the sharp portion of the deformation area is darkly colored. Moreover, in each figure, the line which shows the 1st dimension D1 and the 2nd dimension D2 is shown by the thick line.

  Referring to FIGS. 1 and 2, the drip sheet 10 is used by laying on the bottom wall 1a of the food tray 1 with the fresh food (meat meat in the illustrated example) 2 placed thereon. The drip sheet 10 has a longitudinal direction (first or second direction) Y and a transverse direction (second or first direction) X intersecting therewith, and is an upper surface 3 on which the fresh food 2 is placed. A lower surface 4 in contact with the bottom surface of the tray 1, an upper layer sheet 11 formed of a liquid permeable resin film, a lower layer sheet 12 formed of a liquid absorbent fibrous nonwoven fabric, an upper layer sheet 11 and a lower layer And an intermediate layer 13 for joining the sheet 12. The upper and lower layer sheets 11 and 12 form upper and lower surfaces 3 and 4 of the drip sheet 10, respectively.

  The food tray 1 is formed of expanded polystyrene, a PET (polyethylene terephthalate) sheet or the like. The tray 1 has a bottom wall 1a on which the drip sheet 10 is laid, a peripheral wall 1b rising in an inclined manner from the outer periphery of the bottom wall 1a, and an outer peripheral flange portion 1c extending outward from the upper end of the peripheral wall 1b. As the fresh food 2 disposed on the drip sheet 10, one that exudes drip mainly composed of water, such as meat, raw fish and fresh products, is suitably used. Although not illustrated, in a state where fresh food 2 is stored in tray 1, it is packaged in a wrap film and sold at a storefront such as a retail store or a supermarket.

  With reference to FIGS. 1-3, the upper layer sheet 11 penetrates the upper layer sheet 11 from the upper surface 3 to the lower surface 4 regularly or irregularly arranged adjacent to each other in the plane direction (XY direction) thereof. A plurality of air-permeable and liquid-permeable openings (liquid introduction portions) 14 are formed. The openings 14 have circular shapes that have substantially the same cross-sectional shape. Fresh food 2 such as meat and vegetables is placed on the upper surface 3 of the drip sheet 10, that is, on the upper surface 3 side of the upper layer sheet 11, or by covering the whole fresh food 2 with the drip sheet 10 The drip which exudes from 2 moves to the lower layer sheet 12 through the opening 14.

  The opening 14 functions as a liquid introducing pipe for rapidly moving the drip to the lower layer sheet 12, and also functions as an air pipe for providing air permeability to the contact surface with the fresh food. The apertures 14 may have various cross-sectional shapes such as rectangles, triangles, etc. in addition to circular shapes, and can exhibit various array patterns such as waves, zigzags, etc., as well as lattices, and decorative effects. For this purpose, they may be arranged so as to represent characters and patterns visible from the outside.

The upper layer sheet 11 is a liquid-pervious thermoplastic resin film, for example, a low density polyethylene having a thickness of 0.3 to 0.35 mm, a mass of 10 to 30 g / m ² and a density of 0.03 to 0.10 g / cm ^3. And the like, and are formed from thermoplastic films of polyolefins such as The hole area ratio of the upper layer sheet 11 is 20 to 60%, preferably 40 to 50%. If the open area ratio is less than 20%, drips exuded from fresh food can not be quickly transferred to the lower layer sheet 12, and if the open area ratio exceeds 60%, the upper layer sheet 11 is torn. The strength and stiffness may be relatively low, and part of the sheet may be torn during the manufacturing process and during use.

  The hole area ratio is the ratio (%) of the area of the holes 14 to the surface area of the drip sheet 10, and can be measured, for example, by the following method. The drip sheet 10 is cut into a size of 100 mm × 100 mm to prepare a sample, and the aperture 14 viewed from the upper surface 3 side per one sample in the sample using a commercially available microscope (for example, Digital Microscope VHS2000 manufactured by Keyence Corporation). (Area of the upper end portion of the opening 14) is determined. The open area of the sample is calculated by multiplying the area of the open holes 14 per piece by the number of open holes of the sample. The percent open area can be determined by dividing the open area of the sample by the area of the sample.

  The upper layer sheet 11 is colored in green or the like so that the fresh food 2 looks fresh. For example, in the case where the drip sheet 10 has a form imitating a plant leaf such as a large leaf, the upper layer sheet 11 can be green to have an appearance similar to that of a plant leaf. In particular, by curling a part of the drip sheet 10, it is possible to give the fresh food 2 a fresh appearance by presenting a leaf-like appearance of a more natural plant. When the tray 1 is colored in red, blue or the like in addition to white, the upper layer sheet 11 may be colored in a similar color or a different color to the tray 1. In addition, when the design pattern is applied to the tray 1, the drip sheet 10 may have a form that recalls an image associated with the design pattern.

The lower layer sheet 12 is for absorbing and retaining drips exuding from the fresh food 2, and is a liquid-absorbent fibrous non-woven fabric containing water-absorbing fibers, for example, a thickness of 0.25 to 0.30 mm, a mass of 45 to It is formed from an air-laid non-woven fabric containing pulp fibers of 100 g / m ² and density of 0.15 to 0.40 g / cm ³ . For pulp fibers, common pulp fiber raw materials can be used, and in addition to hardwood and softwood wood fibers, plant fibers other than wood, synthetic fibers and the like can be used in combination. However, softwood pulp fibers are preferably used in consideration of the rigidity and tensile strength of the sheet.

In the intermediate layer 13, a hot melt adhesive for bonding the upper layer sheet 11 and the lower layer sheet 12 is applied at a mass ratio of ¹ to 5 g / m ² . The hot melt adhesive can be intermittently applied in various coating patterns such as spirals and dots, but in order not to inhibit the permeability and permeability of the openings 14 of the upper layer sheet 11. Preferably, the coating is applied with a width smaller than the diameter of the opening 14. In the present invention, the upper layer sheet 11 and the lower layer sheet 12 are adhered by a hot melt adhesive, but various thermal treatments such as heat sealing and ultrasonic sealing can be performed as long as the technical effects of the present invention described later are exhibited. It can also be joined by welding means.

The bending rigidity (value) of the upper layer sheet 11 by the KES method is lower than the bending rigidity of the lower layer sheet 12 by the KES method. Specifically, the flexural rigidity of the upper layer sheet 11 by the KES method is 0.0147 × 10 ⁻⁴ Nm / m, and the flexural rigidity of the lower layer sheet 12 by the KES method is 0.1835 × 10 ⁻⁴ Nm / m. The bending recovery of the upper layer sheet 11 by the KES method is 0.0049 × 10 ⁻² Nm / m, and the bending recovery of the lower layer sheet 12 by the KES method is 0.2973 × 10 ⁻² Nm / m. .

<Method of measuring bending stiffness and bending recovery>
It carried out using Kato Tech Co., Ltd. product KES-FB2-AUTO-A bending measurement tester. First, each sheet was cut into a size of 100 mm in the longitudinal direction (flow direction MD of the production line of the sheet) × 30 mm in the lateral direction (direction CD intersecting with the MD direction) to obtain a sample. Next, after zeroing the scale of the measuring tester, the sample was set to bend in a direction perpendicular to the longitudinal direction, measurement was started, and the value of B-2HB displayed on the screen of the measuring tester was recorded. Next, the sample was set to bend in the lateral and vertical directions, the measurement was started, and the value of B-2HB displayed on the screen of the measuring instrument was recorded as well. The bending stiffness was calculated by the following equation 1, and the bending recovery value was calculated by the following equation 2.

  Referring to FIG. 2, the drip sheet 10 is opposed to each other in the longitudinal direction Y in the longitudinal direction Y, and the first and second end edges 10 a and 10 b extending in the lateral direction X so as to face each other in the longitudinal direction Y. And extending first and second side edges 10c and 10d. The length dimension of the second side edge 10d in the longitudinal direction Y is larger than that of the first side edge 10c, and the first end edge 10a is orthogonal to the linear first and second side edges 10c and 10d. While extending linearly, the second edge 10b extends curvilinearly between the first side edge 10c and the second side edge 10d. The drip sheet 10 is divided into a placement area 20 where fresh food 2 is placed, and a deformation area (anomalous area, curl area) 30 having a shape different from the placement area 20 for convenience of explanation. Although only one deformation area 30 is shown in the illustrated example, a plurality of deformation areas 30 may be arranged to be opposed to each other in the longitudinal direction Y or the short direction X.

  The arrangement area 20 of the drip sheet 10 and the deformation area 30 are divided by an imaginary boundary line 18 extending in the lateral direction X. The imaginary boundary line 18 linearly extends from the inflection point 17 formed by the intersection of the first side edge 10c and the second edge 10b toward the second side edge 10d. In the present specification, the virtual boundary line 18 is for indicating the boundary between the arrangement area 20 and the deformation area 30, and the first arrangement line 20 and the deformation area 30 of the drip sheet 10 are arranged in a first row. It means a line extending in a second direction intersecting with the direction and extending in a straight line overlapping a point (a bending point) at which the dimension in the second direction of the drip sheet 10 changes. In the embodiment of FIG. 2, the boundary line 18 is a point at which the arrangement area 20 and the deformation area 30 are aligned in the longitudinal direction (first direction) Y and the dimension of the transverse direction (second direction) X intersecting therewith changes. That is, they extend linearly from the inflection point 17 in the lateral direction X.

  Since the arrangement area 20 for arranging the fresh food 2 of the drip sheet 10 and the deformation area 30 are continuously formed, it is not possible to visually recognize the virtual boundary line 18 which divides them. However, the deformation area 30 has a shape different from that of the arrangement area 20, and a change in the shape can exhibit design in the outer shape, so that a retail store employee etc. can drip sheet 10 on bottom wall 1a of tray 1. When laying and placing the fresh food 2 thereon, it can be said that the fresh food 2 is arranged in the arrangement area 20 so that a part of the fresh food 2 is not located in the deformation area 30 consciously or unconsciously. However, in order to guide the user to place the fresh food 2 only in the placement area 20 for the drip sheet 10, do not place fresh food in the deformation area of the drip sheet 10 packaging bag. It is preferable to print the description regarding the handling such as "."

  The deformation area 30 is a flat fan shape having a pointed portion 33 including the tip 33a, and has a first dimension D1 consisting of a length dimension of the boundary line (base) 18 and a curved outline of the deformation area 30 (outside And a second dimension D2 having a length dimension of the rim, the decoration line).

  In the present specification, the first dimension D1 is a length dimension of a boundary line in a second direction intersecting the first direction in which the disposition area 20 and the deformation area 30 are arranged, and the second dimension D2 is the second dimension It is the length dimension of the outline of the deformation area 30 between the opposing edges facing in the direction. In the aspect illustrated in FIG. 2, the first dimension D1 is a length dimension of the boundary line 18 in the short direction X intersecting the longitudinal direction Y in which the arrangement area 20 and the deformation area 30 are arranged, and the second dimension D2 Is an outline 30 a of the deformation area 30 and is a length dimension between the first and second side edges 10 c and 10 d opposed in the lateral direction X.

  The outline 30a of the deformation area 30 is not a mere straight line, but has a curved or bent line shape. In the present embodiment, when the outline 30a has a curved shape, when the deformation area 30 is curled, the decorativeness is further improved as compared to the case where the deformation area 30 is a straight line. The case where the outline 30a is curvilinear includes the case where a plurality of curves are continuously formed, in addition to the case where the outline 30a is formed from one curved curve. Also, in order to further enhance the decorativeness, it is preferable that the outline 30a have at least one point at which the curvature changes on the curve forming it, that is, at least one inflection point.

  When the outline 30a is in the form of a bent line, it includes a zigzag line (broken line) connecting a straight line and a jagged line in which a plurality of small protrusions are continuously formed in addition to the straight line being bent. In addition, in order to enhance the decorative property of the outline 30a, regardless of curvilinear shape or bent line shape, a point at which the line segments forming the outline 30a intersect, that is, a straight line and a straight line, a straight line and a curved line or a curved line It is preferable that at least one change point at which the shape formed by crossing the two and the curve changes is at least one.

  The deformation area 30 mainly has a shape different from the arrangement area 20 having a rectangular shape, and as a whole, a design that evokes animals, characters, artifacts, etc. in addition to a design that evokes plants such as large leaves and petals. It may have the Further, the deformation area 30 may have decorative elements such as characters, figures, symbols, patterns, and concavo-convex patterns.

  The deformation area 30 further has a boundary line 18 as a base, and connects a bending point 17 which is both ends of the boundary line 18, a point 19 opposite thereto in the latitudinal direction X, and the outermost edge 33a projecting outward most Have a virtual triangle formed by Such a virtual triangle has a pointed portion 33 including the outermost edge 33a. The internal angle α of the pointed portion 33 is an acute angle.

  When the length dimension L1 in the longitudinal direction Y of the drip sheet 10 is 100 to 150 mm and the length dimension W1 in the lateral direction X is 50 to 80 mm, the length dimension L2 in the longitudinal direction Y of the arrangement area 20 is 100 to 100 The length dimension L3 in the longitudinal direction Y of the deformation area 30 is 10 to 50 mm. The size and shape of the tray 1 vary depending on the type, size, etc. of the fresh food 2 to be stored, but the whole bottom surface of the fresh food 2 is covered, and the fresh food 2 directly contacts the sashimi tooth Preferably, the area of the placement area 20 is 70 to 95% of the area of the bottom wall 1 a of the tray 1.

  FIG. 4 is a side view in which the drip sheet 10 is placed on the placement surface 5 having a smooth surface, and the fresh food 2 is placed on the upper surface 3 and left for 5 minutes. In such a state, the deformation area 30 of the drip sheet 10 is in a curled (warped) state so as to be obliquely bent upward from the mounting surface 5. Thus, the designability of the tray 1 is improved and the appearance of the perishable food 2 is improved by the deformation area 30 curling upward and becoming a three-dimensional aspect, and the consumer's willingness to purchase can be enhanced. . About 1 minute after the perishable food 2 is placed on the upper surface 3, the whole of the deformation zone 30 curls almost entirely at the same time, starting from the boundary line 18. Therefore, in the back yard of a retail store, after the employees etc place fresh food 2 on the drip sheet 10 and wrap it, when arranged in the shop, the deformation area 30 has already curled upward. Can appeal to consumers the good appearance.

  In order to make the deformation area 30 of the drip sheet 10 into a three-dimensional aspect, for example, processing such as giving a compromise so as to have a standing tendency at the boundary line 18 in the manufacturing process, or forming the deformation area 30 three-dimensionally In such a case, the deformation area 30 may become three-dimensional and bulky even in the packaged state, and the three-dimensional shape of the deformation area 30 may be broken when handled. . The drip sheet 10 is flat as a whole in a packaged state, so it does not become bulky and is easy to handle in use.

  The upper layer sheet 11 constituting the drip sheet 10 is formed of a synthetic resin film having a plurality of openings 14, and is formed of a synthetic resin when it is punched to form the plurality of openings 14 in the synthetic resin film. The film itself exhibits surface curl characteristics. Also, even in the state where the lower layer sheet 12 is joined to the upper layer sheet 11 through the intermediate layer 13 made of a hot melt adhesive, the lower layer sheet 12 is easily curled under the influence of the surface curling property of the upper layer sheet 11 It can be said. In addition, since the bending rigidity of the upper layer sheet 11 by the KES method is lower than the bending rigidity of the lower layer sheet 12 by the KES method, the force F2 for shrinking the upper layer sheet 11 acts relatively large.

  Also, fresh food 2 is placed on the upper surface 3 of the drip sheet 10, and the lower layer sheet 12 absorbs drips via the upper layer sheet 11, whereby the pulp fibers of the lower layer sheet 12 absorb and retain moisture, causing swelling. It expands and the entire sheet slightly extends outward. Since the upper layer sheet 11 is subjected to a force F2 for shrinking the upper layer sheet 11 and the bending rigidity of the upper layer sheet 11 is smaller than that of the lower layer sheet 12, dripping is caused. It can be said that the outer peripheral edge of the sheet 10 tends to curl inward. Furthermore, by placing the fresh food 2 in the placement area 20, it can be said that a curling tendency is generated in the deformation area 30 in which the fresh food 2 is not placed by reaction due to its own weight.

  Since the energy to curl the deformation area 30 is minute, the entire dimensions in the longitudinal direction Y and the transverse direction X of the drip sheet 10 can not be curled. Therefore, a portion (square portion) having the entire dimension in the transverse direction X, like the end on the first end 10 a side of the drip sheet 10, is not curled as in the deformation area 30.

  The deformation area 30 has a sharp shape in which the width direction (dimension in the width direction X) gradually decreases, and the second dimension D2 is larger than the first dimension D1 so that it is easy to curl even with minute energy It has become. In addition, when the portion of the lower layer sheet 12 where the drip is absorbed is largely separated from the deformation area 30, the influence is on the deformation area 30 even though the pulp fiber absorbs the drip and swells. It turned out that it became difficult and the deformation area 30 did not curl or not curl to such an extent that the fresh food 2 looks better. That is, in order for the deformation area 30 to curl to a required degree, drips are absorbed on or in the vicinity of the boundary line 18 between the arrangement area 20 and the deformation area 30 to swell and expand the pulp fibers, preferably the boundary line On 18 it is necessary for the drip to be absorbed.

  From the above, 1) the flexural rigidity value of the upper layer sheet 11 formed of the apertured film by the KES method is lower than the flexural rigidity of the lower layer sheet 12 by the KES method, and 2) the lower layer sheet 12 absorbs drips. Being composed of a liquid absorbent non-woven fabric which is elongated, 3) the deformation area 30 has a pointed portion 33, and the second dimension D2 is larger than the first dimension D1, 4) the arrangement area 20 and the deformation Absorbing drips on or near the boundary line 18 with the area 30 may be necessary to cause the deformation area 30 to curl to the required degree.

  As the lower layer sheet 12, any known fiber non-woven fabric may be used as long as it is a liquid-absorbent fibrous non-woven fabric which absorbs drips and extends, but comparison is made by using a relatively low density air-laid fiber non-woven fabric. It can be said that the degree of elongation of the sheet is further increased because the fiber gap is such that the pulp fibers having absorbed the drip can swell sufficiently, as compared with the case of using a fiber nonwoven fabric or the like with extremely high density.

  In addition, since the internal angle α of the triangular sharp portion 33 forming the deformation area 30 is an acute angle, the entire deformation area 30 can be more reliably curled. The internal angle α of the pointed portion 33 is at least an acute angle, preferably 5-80 °. If the inner angle α is less than 5 °, the tip of the sharpened portion 33 may be curled too much, and the lower layer sheet 12 may be curled toward the upper surface 3 to deteriorate the appearance. On the other hand, if the internal angle α exceeds 90 °, the degree of tapering of the sharpened portion 33 becomes low, and there is a possibility that the sharpened portion 33 can not be curled to a required degree by minute energy generated at the time of drip absorption of the drip sheet 10.

  In the present specification, the internal angle of the pointed portion of the triangle forming the deformation area is the case where the outer shape of the deformation area is an irregular square, a circle, an ellipse, or a polygon other than a triangle as in this embodiment. With the whole or part of the boundary line as the base, it means the inside angle of the tip of the imaginary triangle defined by both sides connecting the base and the outermost end projecting outward. Therefore, as shown in another embodiment described later, when the deformation area 40, 50, 60 is actually formed of a plurality of triangular portions, the internal angle of the pointed portion 43, 54, 65 of the portion Should just be an acute angle. On the other hand, as in the deformation areas 70, 80, and 90 of the drip sheet 10, the inner angle of the tip of the virtual triangle may be an acute angle, even when the triangular outer shape is not formed. Therefore, “the (triangular) sharp portion of the deformation area” means, in addition to the sharp edge of the triangular deformation area or the sharp edge of the triangular decorative area, the deformation area is triangular as in this embodiment. If not, it includes the tip of the virtual triangle.

  As described above, in order to curl the deformation area 30 to a required degree, it is necessary for the drip to be absorbed in the vicinity of the boundary line 18, but specifically, the drip is absorbed on the boundary line 18 Alternatively, it is preferable that the absorption area of the drip not be separated by 100 mm or more from the boundary line 18. When the absorption area of the drip is separated from the boundary line 18 by 100 mm or more, the minute energy for curling the deformation area 30 becomes difficult to act, and there is a possibility that the whole deformation area 30 can not be curled. .

  On the other hand, when drips are further diffused from the boundary line 18 toward the pointed portions 33, the drips are diffused within a wide range of the deformation area 30 to be in a wet state. Weight is increased. For this reason, the minute energy by the drip sheet 10 can not cause the deformation area 30 to curl, and even if a part on the boundary line 18 side can be curled, an aspect in which the pointed portion 33 hangs down by its own weight It is not good for appearance.

  In the case of a normal pulp air laid fiber non-woven fabric, the diffusibility of drips is excellent by capillary action, but in the present embodiment, drips absorbed by the lower layer sheet 12 are difficult to diffuse, so to speak, from fresh food 2 at pinpoint It has a sheet property that absorbs the dripping out. The sheet properties depend on the properties of a binder (adhesive) applied by a spray method or the like for joining the pulp fibers of the lower layer sheet 12, and the binder of the lower layer sheet 12 is a styrene elastomer. The rubber adhesive used, for example, a synthetic rubber (SBR) which is a copolymer of styrene and butadiene is suitably used. Conventionally, as a binder of air-laid fiber non-woven fabric for forming a drip sheet for food, a binder derived from acrylic acid ester has been suitably used, but by using a binder made of a hydrophobic elastomeric synthetic resin, it is diffusible And can absorb drips at pinpoints.

  Table 1 shows the measurement results of the water absorption degree of each material (1) and (2) measured according to "water absorption test method by paper and board by Klem method" defined in JIS P8141. . The material (1) is a lower layer sheet 12 using a styrenic elastomer rubber adhesive (SBR) as a binder for pulp fibers, and the material (2) is an air laid fiber nonwoven fabric having the same composition as the lower layer sheet 12 And those using an adhesive derived from an acrylic ester as a binder were used.

<Method of measuring Klemm water absorption>
Samples (150 mm long × 25 mm wide) for measurement of each sheet were prepared. For measurement of the Klemm water absorption, a stand having a petri dish filled with water, a vertically extending shaft and an arm extending horizontally from the upper portion of the shaft, a ruler, and a stop watch were used. Place a petri dish under the arm of the stand, attach one end of the sample in the longitudinal direction (flow direction MD of the production line of the sheet) to the tip of the arm of the stand, hang the sample downward from the arm, and so on The end is immersed in water in a petri dish and left for 5 minutes under a standard atmosphere of temperature 20 ° C. and humidity 60%. The distance the sample wicks water at intervals of 30 seconds after the sample is immersed in water for 5 minutes, that is, after 30, 60, 120, 180, 240, and 300 seconds. The height from the water surface was measured with a ruler, and the values at that time were determined respectively. Similar measurements were also made for the sample latitudinal direction (direction CD, which intersects the flow direction of the sheet production line). It carried out 5 times about each of a longitudinal direction and a transverse direction, and made the average value the creme water absorption (mm) in each time (second). The longer the suction distance, the higher the degree of water absorption (diffusion).

  As shown in Table 1, the creme water absorption in the longitudinal direction of the lower layer sheet 12 after 5 minutes is 7.7 mm, the creme water absorption in the lateral direction is 3.3 mm, and an adhesive derived from an acrylic ester is used as a binder The water absorption of creme in the longitudinal direction of the air-laid fiber non-woven fabric was 25.3 mm, and the water absorption of clem in the short direction was 24.3 mm. In addition, when the lower layer sheet 12 passed 3 minutes, there was no change in the Klemm's water absorbency in both the longitudinal direction and the short side direction. The lower the Klemm water absorption of the lower layer sheet 12, the lower the diffusivity, but if it is too low, the absorbability of drips may deteriorate, so by adjusting the sheet configuration appropriately, the longitudinal direction of the lower layer sheet 12 It is preferable that the Klemm water absorption after 5 minutes of Y or the short direction X is 2.0 to 10.0 mm. Thus, it can be said that the lower layer sheet 12 can be spot-absorbed at the part exuded from the fresh food 2 without the diffused drip being widely diffused since its Klemm's water absorbency is relatively low. Therefore, it is possible to suppress that the drip absorbed in the placement area 20 is diffused into the deformation area 30 and the entire deformation area 30 becomes wet. As a result, the entire deformation area 30 is maintained in a dry state, so that the dripping is not absorbed and the deformation area 30 does not hang down, and the curled aspect can be maintained.

  As in the case of the arrangement area 20, the deformation area 30 is composed of the upper layer sheet 11 made of an apertured film and the lower layer sheet 12 made of a liquid-absorbent fibrous nonwoven fabric. It has liquid absorption while having. Some conventional drip sheets do not have a plurality of openings in the deformation area and do not have a liquid absorption property in consideration of designability, manufacturing cost and the like, but in the case of the present embodiment, The formation of the plurality of apertures 14 on the upper surface 3 of the deformation area 30 makes the upper layer sheet 11 softer and more likely to curl as compared with the case where it is not formed. Moreover, even if the fresh food 2 placed on the tray 1 and the drip sheet 10 is relatively large and extends to a part of the deformation area 30 because the deformation area 30 has the liquid absorbing property. The drip which has exudeed from the perishable food 2 can be quickly absorbed and held in the deformation area 30.

  Again referring to FIG. 1, in a state where fresh food 2 is placed and laid on bottom wall 1 a of tray 1, deformation area 30 of drip sheet 10 is positioned on inclined peripheral wall 1 b of tray 1. ing. The deformation area 30 of the drip sheet 10 curls due to the absorption of the drip and is located on the peripheral wall 1b, so that the deformation area 30 bottoms more three-dimensionally when the user views the tray 1 packaged from above. It looks as if it is floating from the wall 1a, and the design is improved. As described above, in order to exert a three-dimensional design effect synergistically by allowing the deformation area 30 itself to be curled and a part thereof to be located on the peripheral wall portion 1 b, about 20 to 60% of the deformation area 30 It is preferable that the part which has the area of is located on the surrounding wall 1b. The peripheral wall 1 b preferably has one or more steps in order to make the deformation area 30 look more three-dimensional in addition to being inclined.

  It is preferable that the pointed portion 33 of the deformation area 30 does not extend outward beyond the peripheral wall 1b. In such a case, since the pointed portion 33 is positioned on the flange portion 1c, when the tray 1 is wrapped with a wrap film, the pointed portion 33 is restrained between the wrap and the flange portion 1c, and the deformation area 30 looks like it is suspended upward, and looks bad.

  The deformation area 30 may be formed not on the side of the second edge 10 b but on the side of the first edge 10 a or may be formed on the side of the first and second edges 10 a and 10 b. Furthermore, it may be formed on the side of the first side edge 10c or the second side edge 10d, or may be formed on the side of the first and second side edges 10c and 10d. However, it is preferable that the deformation area 30 is not formed in both the longitudinal direction Y and the short direction X intersecting with each other, as in the first edge 10 a side and the first side edge 10 d side. In such a case, the boundary lines 18 forming the bottoms of the decorative portions cross each other, and the forces tending to cause the deformation area 30 to curl mutually act, which may make part of the deformation area 30 difficult to warp. It is because there is.

Other Embodiments
5 (a) to 5 (c), 6 (a), 6 (b) and 7 are plan views of another example of the drip sheet 10. FIG. It has the same configuration as the drip sheet 10 according to the present embodiment except for the difference in the shape of the deformation area 30. The outline of each embodiment has at least one change point.

  Referring to FIG. 5 (a), in the present embodiment, the deformation area 40 has two triangular-shaped decorative portions (deformed portions) 41 and. The decorative parts 41 and 42 are isomorphous, and the boundary line 18 between the placement area 20 and the deformation area 40 forms the base of the two decorative parts 41 and 42. The outline 40a of the deformation area 40 is in the form of a bent line having one inflection point (change point) 47c. The boundary line 18 extends in the latitudinal direction X with the same dimension as the vertexes of the decorative portions 41 and 42 which are bending points 47a and 47b of the first and second side edges 10c and 10d. The inner angle α of each of the decorative portions 41 and 42 is an acute angle, and the second dimension D2 is the first and second dimensions that face each other in the transverse direction X intersecting the longitudinal direction Y in which the disposition area 20 and the deformation area 40 are aligned. Since it is a length dimension of the outline 40a of the deformation area 40 between the side edges 10c and 10d, it is a dimension obtained by totaling the oblique sides of the decorative portions 41 and 42. The second dimension D2 is larger than the first dimension D1.

  Referring to FIG. 5 (b), in the present embodiment, the deformation area 50 has three triangular shaped decorative parts (deformed parts) 51-53. The decorative parts 51-53 are isomorphic and large, and the boundary line 18 between the placement area 20 and the deformation area 50 forms the base of the three decorative parts 51-53. The boundary line 18 extends in the lateral direction X between the bending points 57a and 57b of the first and second side edges 10c and 10d. The outline 50a of the deformation area 50 has a zigzag bending line shape having a plurality of bending points. The inner angle α of each of the decorative portions 51 to 53 is an acute angle, and the second dimension D2 is the first and second dimensions opposed to each other in the transverse direction X intersecting the longitudinal direction Y in which the disposition area 20 and the deformation area 50 are aligned. Since it is the length dimension of the outline of deformation field 50 between side edges 10c and 10d, it becomes the size which totaled the two oblique sides of all the decoration parts 51-53. The second dimension D2 is larger than the first dimension D1.

  Referring to FIG. 5 (c), in the present embodiment, the deformation area 60 has four triangular shaped decorative parts (deformed parts) 61-64. The decorative portions 61-64 are isomorphic and the same size, and the boundary line 18 between the placement area 20 and the deformation area 60 forms the base of the four decorative portions 61-64. The boundary line 18 extends in the lateral direction X between bending points 67a and 67b of the first and second side edges 10c and 10d. The outline 60a of the deformation area 60 has a zigzag bending line shape having a plurality of bending points in addition to the aspect illustrated in FIG. 5 (b). The inner angle of each decorative portion 61-64 is an acute angle, and the second dimension D2 is the first and second sides facing each other in the transverse direction X intersecting the longitudinal direction Y in which the disposition area 20 and the deformation area 60 are aligned. Since it is the length dimension of the outline of the deformation area 60 between the edges 10c and 10d, it is a dimension obtained by totaling both oblique sides of all the decorative portions 61-64. The second dimension D2 is larger than the first dimension D1.

  Referring to FIG. 6A, in the present embodiment, the outline 70a (the second end 10b) of the deformation area 70 is serrated in the form of a serrated shape formed of a plurality of protrusions 71, and the arrangement area 20 The boundary line 18 extends obliquely. The deformation area 70 is a virtual triangular pointed portion 73 connecting the bending point 77a of the first side edge 10c, the bending point 77b of the second side edge 10d, and the outermost edge 73a located most outward in the first direction Y. Have. The inner angle α of the pointed portion 73 is an acute angle, and the boundary line 18 extends in the lateral direction X between the bending points 77a and 77b of the first and second side edges 10c and 10d, and the first dimension D1 is a boundary It is the length dimension of the line 18. The second dimension D2 is an outline of the deformation area 70 between the first and second side edges 10c and 10d facing each other in the short direction X intersecting the longitudinal direction Y in which the arrangement area 20 and the deformation area 70 are aligned. Since it is a dimension, it is a length dimension of the sawtooth-like outline 10 b of the deformation area 70. The second dimension D2 is larger than the first dimension D1.

  In this embodiment, since the outline 70a of the deformation area 70 is sawtooth-shaped and has a large leaf design as a whole, it can be said that the decorativeness is higher than in the case of merely having a triangular shape and a convex curved shape. . Further, since the outline 10b of the deformation area 70 has the plurality of projections 71, the plurality of projections 71 curl together with or after the pointed portion 73 after the deformation area 70 curls with the vicinity of the boundary line 18 as a base point. Thus, when the deformation area 70 has the plurality of projections 71, the minute energy of the drip sheet 10 acts not only on the sharp portions 73 but also on the plurality of small projections 71, thereby causing the deformation area 70 to curl more. It can be said that it will be easier.

  Referring to FIG. 6B, in the present embodiment, the drip sheet 10 is generally in the shape of a boat, and the deformation area 80 has a convexly curved shape. The outline 80a of the deformation area 80 is formed from the convex curvilinear second end 10b. The deformation area 80 has a virtual triangular pointed portion 83 connecting the bending point 87a of the first side edge 10c, the bending point 87b of the second side edge 10d, and the outermost edge (tip edge) 83a. The inner angle of the pointed portion 83 is an acute angle, and the boundary line 18 extends in the lateral direction X between the bending points 87a and 87b of the first and second side edges 10c and 10d, and the first dimension D1 is the boundary line 18 length dimensions. The second dimension D2 is an outline 80a of the deformation area 80 between the first and second side edges 10c and 10d opposed to each other in the short direction X intersecting the longitudinal direction Y in which the arrangement area 20 and the deformation area 80 are arranged. Length dimension. The second dimension D2 is larger than the first dimension D1.

  In the present embodiment, the first edge 10 a of the placement area 20 also has a curved shape. However, since the fresh food 2 is disposed substantially in the entire area of the placement area 20, the portion including the leading edge 83b of the placement area 20 does not curl. In addition, even if fresh food 2 is disposed only at the center of placement area 20 and the gently convex portion including tip end 83b is exposed to the outside, the tip is not sharp. , Never curl. However, in such a case, since the substantially boat-like outer shape of the drip sheet 10 is visually recognized, when sashimi is disposed at the central portion of the placement area 20, a boat-like image with fresh sashimi is displayed. Can be given.

  Referring to FIG. 7, in the present embodiment, the deformation area 90 has a substantially balun shape. The deformation area 90 is a sawtooth shape in which an outline 90a formed by the first side edge 10c has a plurality of projections, and has four substantially triangular decorative portions (deformed portions) 91 to 94. The decorative portion 91 protrudes outward more than the other decorative portions 92-94, and the other decorative portions 92-94 are isomorphic. The boundary line 18 extends in the longitudinal direction Y from the inflection point 97a of the second edge 10b toward the first edge 10a, and the first dimension D1 is the length dimension of the boundary line 18. The decorative portion 91 has an imaginary triangular pointed portion 96a whose base 18a is a part of the boundary line 18. Similarly, the decorative portions 92-94 have imaginary triangular pointed portions 96b, 96c, 96d, respectively, which make part of the boundary line 18 the base 18b, 18c, 18d. The inner angle α1 of each virtual triangular pointed portion 96a-96d is an acute angle, and the inner angle α1 of the pointed portion 96a of the decorative portion 91 is smaller than the inner angle α2 of the pointed portions 96b-96d of the other decorative portions 92-94. It has become.

  The second dimension D2 is a sawtooth shape of the deformation area 90 between the first and second end edges 10a and 10b opposed to each other in the longitudinal direction Y intersecting the latitudinal direction X in which the arrangement area 20 and the deformation area 90 are aligned. It is a length dimension of the outline (first side edge) 10c. The second dimension D2 is larger than the first dimension.

  Table 2 is a table showing the results of the curl (curvature) measurement of the drip sheet 10 according to Examples 1 to 4 of the present invention and the drip sheets according to Comparative Examples 1 to 5. The drip sheet 10 according to Examples 1 to 4 and the drip sheet according to Comparative Examples 1 to 5 have a rectangular shape, and the dimension in the short direction is 65 mm, the dimension in the longitudinal direction 160 mm, and the arrangement where fresh food is disposed The dimension in the longitudinal direction of the area is 120 mm, and the dimension in the longitudinal direction of the deformation area having the design property is 40 mm.

Examples 1-4
The drip sheet 10 according to Examples 1 to 4 has a mass of 83.12 g / m ² , a thickness of about 1.2 mm, and an upper layer sheet 11 made of a 25 μm-thick apertured film made of polyethylene; It has a two-layer sheet structure composed of a lower layer sheet 12 formed of an air-laid fiber non-woven fabric having 52 g / m ² of pulp fibers. In the drip sheet 10 of Examples 1 to 4, the upper and lower layer sheets 11 and 12 are joined to each other through the intermediate layer 13 formed of a styrene-based elastomer synthetic resin adhesive (SBR) having a mass of 2 g / m ^2. There is. Examples 1-4 correspond to the embodiments illustrated in FIG. 2 and FIGS. 5 (a), (b) and (c), respectively.

Further, the bending rigidity of the upper layer sheet 11 of the drip sheet 10 of Examples 1 to 4 is 0.0147 × 10 ⁻⁴ Nm / m, and the bending recovery property is 0.0049 × 10 ⁻² Nm / m. The flexural rigidity of the sheet 12 is 0.1835 × 10 ⁻⁴ Nm / m, and the flexural recovery is 0.2973 × 10 ⁻² Nm / m.

<Comparative Examples 1 to 3>
The drip sheet of Comparative Examples 1 to 3 has the same sheet configuration as the drip sheet 10 of Examples 1 to 4, and has a mass of 83.12 g / m ² and a thickness of about 1.2 mm. The drip sheet has a two-layer sheet structure comprising an upper layer sheet made of a 25 μm-thick apertured film made of polyethylene, and a lower layer sheet formed of an air laid fiber non-woven fabric having a mass of 52 g / m ² of pulp fibers. Have.

In the drip sheets of Comparative Examples 1 to 3, the upper and lower layer sheets are bonded to each other via an intermediate layer formed of a styrene-based elastomer synthetic resin adhesive (SBR) having a mass of 2 g / m ² . Moreover, the bending rigidity and bending recovery of each of the upper and lower layer sheets of the drip sheets of Comparative Examples 1 to 3 are the same as those of Examples 1 to 4.

Comparative Example 4
The drip sheet according to Comparative Example 4 has a mass of 87.77 g / m ² and a thickness of about 1.17 mm, and is a polyethylene upper layer sheet made of a 50 μm-thick apertured film, and a mass of 52 g / m ² And a lower layer sheet formed of an air-laid fiber non-woven fabric having pulp fibers of In such a drip sheet, the upper and lower layer sheets are bonded to each other via an intermediate layer formed of a styrene-based elastomer synthetic resin adhesive (SBR) having a mass of 2 g / m ² . Further, the bending rigidity of the upper layer sheet of the drip sheet of Comparative Example 4 is 0.0965 × 10 ⁻⁴ Nm / m, the bending recovery is 0.0209 × 10 ⁻² Nm / m, and the bending rigidity of the lower layer sheet is 0.1835 × 10 ⁻⁴ Nm / m, bending recovery is 0.2973 × 10 ⁻² Nm / m.

Comparative Example 5
The drip sheet according to Comparative Example 5 has a single-layer sheet structure of a chemically bonded fiber non-woven fabric having a thickness of 0.45 mm and a mass of 48 g / m ² . The bending rigidity of the drip sheet of Comparative Example 5 is 1.1141 × 10 ⁻⁴ Nm / m, and the bending recovery is 0.5147 × 10 ⁻² Nm / m.

<Shape of deformation area>
The deformation area 30 of Example 1 is a flat fan-shaped decorative part, the deformation area 40 of Example 2 is two triangular decorative parts, the deformation area 50 of Example 3 is three triangular decorative parts, The deformation area 60 of the fourth embodiment has four triangular shaped decorative parts. The deformation area of Comparative Example 1 is a substantially rectangular decorative portion having the same width direction as the placement area, and the deformation area of Comparative Example 2 is about half the width size of the placement area in the width direction. The substantially square shaped decorative portion having the width dimension of the width, the deformation area of the comparative example 3 is a substantially trapezoidal shaped decorative portion having the base of the same size as the width dimension in the width direction of the arrangement area, the comparative example 4 and The five deformation zones are respectively formed of four triangular decorative portions.

  The photograph of the drip sheet in each of the examples and the comparative examples is a side view of the state after measurement of the measurement of the degree of curl described below, and the deformation area of each drip sheet is curled. In addition, with respect to “angle (°)”, except for Example 1, the angle of the actual pointed portion colored was measured. In Example 1, the angle of the tip portion of a virtual triangle connecting the outermost edge of the deformation area and the both ends of the boundary line was measured.

<Method of measuring curl degree>
The following measurement method was used to compare the degree of curling of the drip sheet of each example and each comparative example. First, a pipette (one capable of measuring at least 5 ml), a ruler, a butt (made of stainless steel), a stopwatch, and a red pen were prepared as instruments to be used. Next, each drip sheet was cut into a size of a dimension of 65 mm in the lateral direction × a dimension of 160 mm in the longitudinal direction to obtain a sample for measurement. In each sample, a red marking pen was used to draw a straight mark line extending in the lateral direction from the end in the lateral direction where the deformation area is not located to the other edge side in the lateral direction where the deformation area is located. In each sample, a region of 120 mm width from one edge in the lateral direction to a mark line attached with a red pen is a placement region, and a region of 40 mm in width from the mark line to the other edge in the lateral direction is a deformation region.

  Next, 5 ml of tap water was dropped onto the vat placed on the mounting table, and the samples were placed on the vat such that the tap water absorbed in the entire arrangement area of each sample. After absorbing water to the mark line of the sample, it was left for 1 minute under a standard atmosphere. After that, the separation dimension (mm) between the largest portion of the deformation in the dry state and the surface of the mounting table was measured with a ruler. When the width dimension of the deformation area is relatively large, the curling degree of each sample is obtained by measuring and averaging three large portions of warping and performing the same measurement plural times (N = 3). (Mm).

<Curl evaluation>
According to the applicant's knowledge, when the degree of curl (mm) exceeds 10 mm, the deformation area of the drip sheet has a three-dimensional aspect to the extent that the appearance of fresh food becomes good. Furthermore, when the degree of curling exceeds 15 mm, the deformation area becomes a more three-dimensional aspect, and the fresh food looks better. On the other hand, when the degree of curling is 10 mm or less, the deformation area does not have a three-dimensional aspect to the extent that the appearance of fresh food becomes good. Therefore, when the degree of curling was 10 to 15 mm, it was evaluated as “Δ (good)”, when exceeding 15 mm, it was evaluated as “○ (good)”, and when less than 10 mm, it was evaluated as “× (impossible)”.

  Referring to Table 2, the curling degree of Examples 1 to 4 was 12.7 to 18.9 mm, and the curling evaluation was "Δ (good)" or "○ (good)". On the other hand, the curling degree of Comparative Examples 1 to 5 was 4.6 to 9.9 mm, and the curling evaluation was “x (impossible)”. That is, the drip sheet 10 according to Examples 1 to 4 has a curling degree of at least 10 mm or more, and the deformation areas 30, 40, 50, 60 in a three-dimensional form when accommodated in the tray 1 To make the fresh food 2 look better. Moreover, it can be said from the curl measurement results of each of Examples 1 to 4 that the smaller the internal angle of the decorative portion, the larger the curl. On the other hand, as in Comparative Examples 1 to 3, when the decorative portion did not have a pointed portion, it was difficult to curl even if the width dimension was small.

  Comparing Example 4 with Comparative Example 4, when the thickness of the synthetic resin film forming the upper layer sheet is about twice, the degree of curling is small. Therefore, when the thickness of the synthetic resin film is relatively large, it can be said that the bending rigidity becomes high and the deformation region becomes difficult to curl. In addition, in Comparative Example 5, the drip sheet has a single-layer structure of a liquid-absorbable chemical bond fiber non-woven fabric, so even if a force to absorb drips and stretch on the non-woven fabric itself is applied, this embodiment relates to this embodiment. As the drip sheet 10, a force to shrink by the synthetic resin film does not act on it, and the energy to curl the entire deformation area is relatively small and the curl degree is small. it is conceivable that.

  In addition to the materials described herein, each component constituting the drip sheet 10 uses, without limitation, various known materials commonly used in this type of field unless otherwise specified. be able to. The terms "first", "second" and the like, as used in the present specification and in the claims of the utility model registration, are used merely to distinguish similar elements, positions and the like.

1 tray 1a for perishable food bottom wall 1b peripheral wall 2 fresh food 10 drip sheet 11 upper layer sheet 12 lower layer sheet 14 opening 18 boundary line 20 arrangement area 30 deformation area 33 sharpened part 40 deformation area 41, 42 decorative part 50 deformation area 51 , 52, 53 decorative part 60 deformation area 61, 62, 63, 64 decorative part 70 deformation area 71 projection 80 deformation area 90 deformation area 91, 92, 93, 94 decorative part X short direction (first direction or second direction )
Y longitudinal direction (first direction or second direction)
α interior angle α1 interior angle α2 interior angle

Claims (10)

In a drip sheet for fresh food having an upper surface and a lower surface, and a second direction intersecting with the first direction and the first direction,
A two-layer sheet structure comprising an upper layer sheet formed of a film having a plurality of apertures and a lower layer sheet formed of a fibrous nonwoven fabric containing water absorbing fibers,
The flexural rigidity of the upper layer sheet by the KES method is lower than the flexural rigidity of the lower layer sheet by the KES method,
It has an arrangement area for arranging the fresh food, a deformation area located parallel to the arrangement area in the first direction, and a virtual boundary line between the arrangement area and the deformation area.
The deformation zone has at least one sharpened portion,
An outline of the deformation area between opposing edges facing each other in the second direction of the drip sheet is a curved or bent linear shape.   The drip sheet according to claim 1, wherein the deformation area is curled by absorbing the drip on or in the vicinity of the boundary line in a state where the fresh food is placed on the upper surface.   The drip sheet according to claim 1, wherein the outline of the deformation area has at least one inflection point.   The drip sheet according to any one of claims 1 to 3, wherein the outline of the deformation area is a zigzag or sawtooth shape formed of a plurality of protrusions.   The drip sheet according to any one of claims 1 to 4, wherein the deformation area has a triangular decorative portion whose base is the whole or a part of the boundary line, and an inner angle of the decorative portion is an acute angle.   The drip sheet according to any one of claims 1 to 5, wherein the water absorption degree of the lower layer sheet is 2.0 to 10.0 mm.   The drip sheet according to any one of claims 1 to 6, wherein the upper layer sheet is a thermoplastic synthetic resin film formed of polyethylene, and the lower layer sheet is an air-laid fiber nonwoven fabric containing pulp fibers.   The drip sheet according to claim 7, wherein the pulp fibers of the air-laid fiber non-woven fabric are bonded to each other through an adhesive using a styrenic elastomer. A tray for fresh food using the drip sheet according to any one of claims 1 to 8, wherein
A bottom wall on which the drip sheet having the perishable food disposed on the top surface is laid, and a peripheral wall standing up from an outer peripheral edge of the bottom wall, and a part of the deformation area is located on the peripheral wall Characterized tray.   The tray according to claim 9, wherein the area of the arrangement area of the drip sheet is 70 to 95% of the area of the bottom wall.