Food preparation sheets

Abstract

To provide a food cooking sheet having excellent detachability.SOLUTION: A food cooking sheet is provided, including: aluminum foil having a food placement surface on at least its one surface; and a resin layer which is laminated on the food placement surface of the aluminum foil and has detachability. The resin layer includes: a ground region having sea-island structure in which a first recess is a continuously formed sea and first protrusions are a plurality of islands in a planer view; and a pattern region which is formed of at least one of a second protrusion and a second recess and configures a design. The height based on height of the first protrusions, of the pattern region is equal to or larger than -30 μm and equal to or less than +30 μm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a food cooking sheet. [Background technology]

[0002] Food preparation sheets such as aluminum foil and cooking sheets are used by placing them on cooking utensils such as frying pans to prevent them from getting dirty. Specifically, when grilling ingredients such as meat or fish, aluminum foil is placed on the frying pan and the ingredients are then placed on top of it. Cooking using a food preparation sheet in this way prevents the cooking utensils from getting dirty and makes cleanup after cooking easy. On the other hand, food preparation sheets are required to have the ability to release ingredients (hereinafter sometimes simply referred to as "release") so that ingredients do not adhere to the sheet surface. For example, Patent Document 1 discloses a food preparation sheet having a silicone resin layer surface.

[0003] Furthermore, one example of a food cooking sheet having a resin layer is a food cooking sheet that has a sea-island structure in which the recesses in the resin layer form the sea and the protrusions form the islands, and the sea is formed continuously, thereby enabling a balanced improvement in peelability and uniformity of cooking (see, for example, Patent Document 2 below). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 1-170431 [Patent Document 2] Japanese Patent Application Publication No. 2020-25859 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, food preparation sheets have been given a background area on their food placement surfaces with patterns such as grids (hereinafter sometimes simply referred to as "background patterns"), or with designs (hereinafter sometimes simply referred to as "designs") that are visually recognizable to consumers, such as letters, pictures, various figures, and lines, that are created by contrasting the reflectivity of the unevenness of the background pattern with the unevenness of the background pattern. However, when cooking with a food preparation sheet that has a design on its food placement surface that takes advantage of the uneven shape of the food placement surface, the food may adhere to the sheet near the boundary between the design and the background pattern when removing the heated food from the sheet. For this reason, there is a demand for the development of a food preparation sheet that provides better food release properties.

[0006] In order to solve the above problems, an object of the present invention is to provide a food cooking sheet that has excellent releasability. [Means for solving the problem]

[0007] The present inventors have conducted extensive research to solve the above-mentioned problems, and as a result have found that the above-mentioned problems can be solved by reducing the height difference between the convex portions in the base region and the picture region, which has led to the completion of the present invention.

[0008] That is, the present invention is as follows. <1> an aluminum foil having a food-receiving surface on at least one side; a peelable resin layer laminated on the food placement surface of the aluminum foil; A food cooking sheet comprising: The resin layer is a base region having a sea-island structure in which, in a plan view, the first recesses are seas and the first protrusions are islands, the seas are continuously formed, and the base region has a plurality of islands; a pattern area that is formed in at least one of the second convex portion and the second concave portion and that constitutes a design; The height of the pattern area relative to the height of the first protrusions is not less than -30 μm and not more than +30 μm. <2> the base region has a first grid pattern made up of the first concave portions and the first convex portions; <1> The food cooking sheet according to claim 1. <3> the picture area has a second grid pattern made up of the second recesses and the second protrusions, <1> or the above <2> The food cooking sheet according to claim 1. <4> the base region has a first grid pattern configured with the first concave portions and the first convex portions, the picture area has a second grid pattern constituted by the second concave portions and the second convex portions, the difference between the mesh size of the first lattice pattern and the mesh size of the second lattice pattern is 50 meshes or more; <1> The food cooking sheet according to claim 1. <5> The mesh size of the second lattice pattern is smaller than the mesh size of the first lattice pattern. <4> The food cooking sheet according to claim 1. <6> The mesh size of the first lattice pattern is 100 to 200 mesh, and the mesh size of the second lattice pattern is 50 to 150 mesh. The aforementioned <4> or the above <5> The food cooking sheet according to claim 1. <7> The ten-point average roughness (Rz) of the base region is 3 μm to 40 μm. <1> ~The above <6> 1. The food cooking sheet according to any one of the preceding items. <8> The resin layer contains one or more resins selected from the group consisting of silicone resins and fluororesins. <1> ~The above <7> 1. The food cooking sheet according to any one of the preceding items. [Effects of the Invention]

[0009] According to the present invention, a food cooking sheet with excellent releasability can be provided. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing a food placement surface of a food cooking sheet according to an embodiment of the present invention. FIG. [Figure 2]FIG. 2 is a schematic view showing a cross section AA in FIG. [Figure 3] FIG. 10 is a schematic diagram for explaining an embodiment in which the picture area has a second grid pattern. [Figure 4] FIG. 10 is a schematic diagram for explaining an embodiment in which a picture area is formed by a second recess. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described in detail, but the present invention is not limited to this and various modifications are possible without departing from the spirit of the present invention. The upper and lower limit values ​​in each numerical range of the present embodiment can be arbitrarily combined to form any numerical range.

[0012] [Food preparation sheet] The food cooking sheet of this embodiment includes an aluminum foil with a food placing surface on at least one side, and a peelable resin layer laminated on the food placing surface of the aluminum foil, wherein the resin layer has a sea-island structure in plan view, with the first recesses forming the sea and the first protrusions forming the islands, and the sea is continuously formed, forming a base region having a plurality of the islands, and a pattern region formed on at least one of the second protrusions and the second recesses and constituting a decorative design, and the height of the pattern region relative to the height of the first protrusions is between -30 μm and +30 μm.

[0013] Conventionally, when forming a picture or base pattern on a food cooking sheet, a roll (hereinafter sometimes referred to as an "embossing roll") having a surface with indentations corresponding to the picture or base pattern of the sheet is used, and this is pressed against the sheet surface to form the indented picture or base pattern. For example, when forming a convex base pattern or picture on the sheet surface, the areas on the embossing roll surface corresponding to the base pattern or picture become indentations. However, the areas on the roll surface corresponding to the picture are usually formed by a method different from the method for forming the areas corresponding to the base pattern. For example, the areas on the roll corresponding to the picture are usually formed by etching, while the areas corresponding to the base pattern are formed by stamping using another roll (such as a mother roll) after the areas corresponding to the picture are formed. For this reason, for example, when forming a picture on a food cooking sheet using indentations, the areas (indentations) on the roll corresponding to the picture (indentations) need to be deeper than the areas (indentations) corresponding to the convex portions of the base pattern of the sheet on the roll. When such an embossing roll is used to form irregularities on the sheet surface, the convex portions of the pattern are higher than the convex portions of the base pattern, resulting in a sheet with a difference in height between the pattern and the base pattern. However, as mentioned above, when using a food cooking sheet obtained by such a conventional method, when food is heated and removed, food may adhere to the sheet, for example, near the boundary between the base pattern and the pattern.

[0014] In response to this trend, new technologies have been developed in recent years that use laser engraving instead of etching or engraving using other rolls to simultaneously process the areas on an embossing roll that correspond to the pattern and the base pattern. Using this technology, even when the pattern on a food cooking sheet is formed using raised portions, it is possible to adjust the depth of the areas (recesses) on the roll that correspond to the pattern and the areas (recesses) that correspond to the raised portions of the base pattern of the sheet on the roll. Therefore, when an embossing roll using this technology is used to form recesses and protrusions on the sheet surface, the heights of the raised portions that make up the pattern and the raised portions of the base pattern can be freely adjusted. Furthermore, this laser engraving can form raised and recessed portions in the pattern portion of the sheet.

[0015] While the manufacturing method is not limited, the food cooking sheet of this embodiment, which uses this new technology to set the height of the patterned area relative to the height of the first protrusions at between -30 μm and +30 μm, can improve the releasability of the sheet and ingredients. The reason for the excellent releasability of the food cooking sheet of this embodiment is unclear. On the other hand, as described above, in conventional patterned food cooking sheets, there is a certain level of difference in the height of the protrusions between the patterned area and the base area, and this difference in height is presumed to be one of the causes of reduced releasability. Specifically, if there is a difference in height between the protrusions of the resin layer, for example, when ingredients on the sheet move horizontally during cooking or when removing the ingredients from the sheet after cooking, the ingredients may get caught on the high protrusions, which is one of the causes of ingredients sticking to the sheet surface. Furthermore, when ingredients such as meat and fish are heated during cooking, they may clump together due to the evaporation of moisture and the loss of oil. When cooking such ingredients, if the ingredients are placed in an area where the protrusions have different heights (i.e., if the ingredients are in contact with a group of protrusions with different heights), the high protrusions may become caught in the surface of the ingredients as the ingredients clump together. It is believed that this type of convexity affects the ease of removing the ingredients from the sheet. In contrast, the food cooking sheet of this embodiment has a small difference in height between the protrusions in the pattern area and the base area of ​​the resin layer, which prevents the ingredients from getting caught in some of the protrusions or from becoming caught in the clumps of ingredients, and is therefore believed to improve the ease of releasability between the sheet and the ingredients.

[0016] (Configuration of food preparation sheets) First, the configuration of the food cooking sheet of this embodiment will be described using Figures 1 to 4. Figure 1 is a schematic diagram showing the food placement surface of the food cooking sheet of this embodiment. Figure 2 is a schematic diagram showing the AA cross section of Figure 1. Figure 3 is a schematic diagram for explaining an embodiment in which the design area has a second lattice pattern. Figure 4 is a schematic diagram for explaining an embodiment in which the design area is composed of second recesses. Note that all components shown in the following figures are examples, and the sizes and shapes of the components are not limited by these figures.

[0017] As shown in Figure 1, the food cooking sheet 100 of this embodiment has a base region 12 and a pattern region 14 formed on a resin layer 10. As shown in the figure, the food cooking sheet 100 also has a base region 12 surrounded by a pattern region 14. In the base region 12, a sea-island structure is formed, in which the first recesses form a sea and the first protrusions form islands, as will be described in detail later. Furthermore, in Figure 1, the sea-island structure of the base region 12 is formed over the entire resin layer 10 (food-placing surface) except for the pattern region 14. In addition, a first grid pattern made up of the first recesses and first protrusions is formed in the base region 12.

[0018] As shown in Fig. 1, the pattern area 14 is an area that constitutes a visually comprehensible design. In Fig. 1, the pattern area 14 is composed of second convex portions that are continuous (extending) in a linear or curved shape in any direction along the surface of the resin layer 10.

[0019] When the cross section AA of the food cooking sheet 100 in FIG. 1 is observed, the base area 12 is provided with first recesses 12R and first protrusions 12C, as shown in FIG. 2. Similarly, second protrusions 14C are provided in the design area 14. FIG. 2 shows an embodiment in which the design area 14 is composed only of second protrusions 14C (i.e., does not have second recesses). Also, as shown in the same figure, in the food cooking sheet 100, the height of the second protrusions 14C is the height of the design area 14. Therefore, the height t2 of the second protrusions 14C relative to the height t1 of the first protrusions 12C (i.e., the height difference (t2-t1) between the first protrusions 12C and the second protrusions 14C) is between -30 μm and +30 μm. In this way, the food cooking sheet 100 is configured to minimize the difference in height between the first protrusions 12C and the second protrusions 14C, which allows for excellent peelability between ingredients and the sheet. This effectively prevents ingredients from adhering to the base area 12 near the boundary between the base area 12 and the pattern area 14, which is common in conventional cooking sheets (especially the base area 12 located around the area where the ingredient was in contact until the end, when an ingredient of a certain length is removed (peeled) from a specific direction).

[0020] 1 may have a first grid pattern 12P formed by a regular arrangement of first recesses 12R and first protrusions 12C, as shown in Fig. 3. Furthermore, as shown in Fig. 3, second recesses 14R may be provided in the picture area 14, and a second grid pattern 14P may be formed by a regular arrangement of second recesses 14R on the second protrusions 14C.

[0021] 1 to 3 show examples in which the pattern area 14 is formed only by the second protrusions 14C and by a combination of the second protrusions 14C and the second recesses 14R, but the present invention is not limited thereto. That is, the "pattern area" of the present invention may be formed by at least one of the second protrusions and the second recesses. For example, the pattern area can be formed by 1) the second protrusions only, 2) the second recesses only, or 3) a combination of the second protrusions and the second recesses. For example, when the pattern area 14 is formed only by the second recesses 14R, the food cooking sheet has a cross-sectional view as shown in FIG. 4. Furthermore, when the pattern area 14 is formed only by the second recesses 14R as shown in FIG. 4, the "height of the pattern area" is determined based on the lowest point of the second recesses. In other words, the "height of the pattern area based on the height of the first convex portion" corresponds to the distance from the height (t1) of the first convex portion to the lowest point (t2) of the second concave portion in a direction parallel to the sheet thickness direction.

[0022] The components of the food cooking sheet of this embodiment will be described below.

[0023] (aluminum foil) The food cooking sheet of this embodiment includes an aluminum foil having a food placement surface on at least one side. Examples of aluminum foil include aluminum foil and aluminum alloy foil. Examples of these foils include those specified in JIS H4160, such as 1N30, 1100, 8079, and 8021. In this embodiment, the food placement surface needs to be on at least one side of the aluminum foil, but food placement surfaces may be provided on both sides of the aluminum foil depending on the desired application.

[0024] (resin layer) In this embodiment, a peelable resin layer is laminated on at least one surface of the aluminum foil on the food-receiving surface. The resin layer is laminated, for example, on the surface on which food ingredients are placed (the food-receiving surface) of the aluminum foil.

[0025] The resin in the resin layer is not particularly limited as long as it is a resin having releasability and heat resistance. From the viewpoint of releasability, the resin is preferably one or more selected from the group consisting of silicone resins and fluororesins, and more preferably a silicone resin. Examples of silicone resins include synthetic resins whose main component is a polymer in which the main polymer chain is an alternating arrangement of silicon atoms and oxygen atoms, and which are coatable. Examples of such silicone resins include polydimethylsiloxane, polyphenylmethylsiloxane, polyalkylalkenylsiloxane, polyalkylhydrosiloxane, etc. These silicone resins may be used alone or in combination of two or more. The silicone resin may also be (a) a product obtained by an addition reaction between a methylvinylpolysiloxane and a methylhydrogenpolysiloxane in the presence of a platinum catalyst, such as chloroplatinic acid, chloroplatinic acid, platinum complex salts, or a complex of chloroplatinic acid and a siloxane; or (b) a product obtained by a condensation reaction between a long-chain dimethylsiloxane having silanol functionality at both ends and a methylhydrogenpolysiloxane or a methylmethoxypolysiloxane in the presence of an organotin catalyst.

[0026] In the food cooking sheet of this embodiment, as will be described later, a resin layer is laminated on one side of the aluminum foil, and then a process for forming protrusions and recesses such as embossing (hereinafter simply referred to as "embossing") is performed. Therefore, the resin layer may be stretched thin due to the protrusions and recesses caused by the embossing. For this reason, the mass per unit area of ​​the resin layer is set to 0.02 g / m from the viewpoint of peelability. 2 It is preferable that the content is 0.04 g / m or more. 2 On the other hand, from the viewpoint of exhibiting good thermal conductivity, it is more preferable that the thickness is 1.5 g / m or more. 2 Preferably, it is 1.0 g / m or less. 2 More preferably, it is:

[0027] The resin layer can be laminated on the aluminum foil by known methods, such as applying a resin-containing solution to the aluminum foil or laminating a resin film on the aluminum foil.

[0028] (sea-island structure) In this embodiment, the resin layer has a sea-island structure in plan view, with the first recesses as the sea and the first protrusions as the islands. In the sea-island structure, the sea (first recesses) is continuously formed, and the resin layer further has a base region having a plurality of islands (first protrusions) and a pattern region formed by at least one of the second protrusions and the second recesses and constituting a design. As described above, in this embodiment, the height of the pattern region relative to the height of the first protrusions is between -30 μm and +30 μm.

[0029] (base area) In this embodiment, the "base region" refers to a region on the surface of the resin layer that has a sea-island structure composed of first recesses (sea) and first protrusions (islands), and in which a base pattern is formed by the first recesses and first protrusions. As described above, in the sea-island structure on the resin layer, the sea is continuously formed, and further, the sea-island structure has a plurality of islands. Here, "continuous sea formation" means, for example, that there is only one sea across the entire surface of the resin layer in a planar view. The base region may have a first lattice pattern composed of the first recesses and first protrusions, or the first recesses and protrusions may be regularly arranged to form the first lattice pattern. Furthermore, the base region may be formed on the entire food placement surface except for the picture region on the food placement surface.

[0030] As described above, the first protrusions (islands) may be regularly formed on the surface of the base region, or irregularly formed, such as in an irregular satin-like pattern. The shape of the first protrusions in plan view may be, for example, a polygonal shape such as a triangle or a rectangle, a circular shape such as a circle or an ellipse, or a random shape forming an irregular satin-like pattern. The first grid pattern described above may be formed by regularly or irregularly arranging first protrusions of the same or different shapes. The number of first protrusions (islands) may be one or more, but a plurality is preferred from the viewpoint of improving peelability and uniformity of fire resistance in a more balanced manner.

[0031] In order to ensure a sufficient contact area between the food material and the sheet to prevent a decrease in peelability, further improve visibility, and prevent tearing of the sheet, the base region preferably has a ten-point mean roughness (Rz: JIS B0601-1994) of 3 μm to 40 μm, more preferably 10 μm to 30 μm, and particularly preferably 15 μm to 25 μm. The ten-point mean roughness (Rz) can be measured using a known surface roughness measuring instrument, and can be determined, for example, by the method described in the examples below.

[0032] (Picture area) In this embodiment, the "pattern area" refers to an area constituting a design on the surface of the resin layer. Specifically, it refers to an area formed by at least one of the second convex portions and the second concave portions, and configured with a pattern that allows consumers to recognize the specific design when observing the food placement surface. As described above, the pattern area may be formed by 1) only the second convex portions, 2) only the second concave portions, or 3) a combination of the second convex portions and the second concave portions. The specific design of the pattern area is not particularly limited, but may include letters, patterns, various figures, lines, etc., as long as it is a pattern that is visually recognizable to consumers when observing the surface of the resin layer. The letters, patterns, various figures, lines, etc. formed by the pattern area can be visually recognized by consumers, for example, due to the contrast in reflectivity caused by the difference in height between the unevenness of the base area and the unevenness of the pattern area. In the design area, the specific design is constituted by a pattern formed by second convex portions and / or second concave portions connected in a linear or curved manner. For example, when the design area is mainly formed by second convex portions, the second convex portions are convex portions that are continuous (extending) in a linear or curved manner in any direction parallel to the surface of the resin layer. In other words, the design area is a pattern constituted by second convex portions that are continuous in a linear or curved manner in any direction depending on the desired design. When the design area is mainly formed by second convex portions, although not particularly limited, it is preferable that the second convex portions are convex portions that are continuous in a direction parallel to the surface of the resin layer, preferably 300 μm or more, more preferably 400 μm or more.

[0033] The pattern area may have both second convex portions and second concave portions. For example, if the pattern area is mainly formed by second convex portions, the "second concave portions" become concave portions that separate the pattern formed by the second convex portions, and become concave portions formed in the pattern that constitutes the aesthetic design. Therefore, if the pattern area is mainly formed by second convex portions as described above, the second convex portions may be convex portions formed continuously over a certain length or more, but may also have discontinuous portions due to the presence of second concave portions. The pattern area may have a second grid pattern composed of second concave portions and second convex portions (i.e., a pattern formed by separating the second convex portions with the second concave portions), or the second concave portions may be regularly arranged on the second convex portions to form the second grid pattern. The second grid pattern formed by the second recesses may be a pattern in plan view in which the same or different shapes are regularly or irregularly arranged, such as polygonal shapes such as triangles and rectangles, circular shapes such as circles and ellipses, or random shapes that form an irregular matte pattern.Furthermore, even when the design area is mainly formed by the second recesses, the second grid pattern may be formed by regularly or irregularly arranging second protrusions relative to the second recesses.

[0034] (Height of the picture area) In this embodiment, when the pattern area is formed by only the second convex portion or a combination of the second convex portion and the second concave portion, the "height of the pattern area based on the height of the first convex portion" is the "difference in height between the first convex portion and the second convex portion." Furthermore, when the pattern area is formed only by the second recess, the "height of the pattern area based on the height of the first convex portion" is the "distance from the first convex portion to the lowest point of the second recess in a direction parallel to the sheet thickness direction." As described above, the height of the pattern region relative to the height of the first protrusions is between −30 μm and +30 μm. In this embodiment, the difference (t1-t2) between the height (t1) of the first protrusions in the base region and the height (t2) of the pattern region is set to −30 μm and +30 μm (i.e., t2 [μm] = (t1 [μm]-30 μm) to (t1 [μm]+30 μm)), thereby improving the releasability of the food cooking sheet of this embodiment. There is no particular problem with the difference (t1-t2) between the height (t1) of the first protrusions in the base region and the height (t2) of the pattern region as long as it is within the above-mentioned range. However, from the viewpoint of further improving releasability, it is preferably between −18 μm and +18 μm, and more preferably between −10 μm and +10 μm. Furthermore, when the pattern area is formed by only the second convex portion or a combination of the second convex portion and the second concave portion, it is particularly preferable that the difference in height between the first convex portion and the second convex portion is approximately 0 μm.

[0035] The difference (t1-t2) between the height (t1) of the first convex portion in the base region and the height (t2) of the pattern region can be calculated, for example, by using a known laser microscope to measure the step (unit: μm) between the first convex portion in the base region and the second convex portion or concave portion in the pattern region at the boundary between the base region and the pattern region.

[0036] (Method for producing a concave-convex structure) The cross-sectional shapes of the first and second convex portions are not particularly limited, and any desired shape such as a rectangle, a triangle, or a semicircle can be adopted. The depth of each concavo-convex portion is not particularly limited, but the height of the first convex portion (i.e., the depth of the first concave portion) can be, for example, about 3 to 40 μm. If the depth of the concavo-convex portion is 40 μm or less, cracks are less likely to occur when the resin layer is thinly stretched over the embossed concavo-convex portions.

[0037] Methods for forming the sea-island structure of the base region (first convex portions and first concave portions) and the pattern constituting the design region (second convex portions and second concave portions) in the resin layer are not particularly limited, but include embossing the surface of the resin layer. In this case, for example, the base region and design region of this embodiment can be formed in the resin layer of the food cooking sheet using an embossing roll whose surface is formed with regions corresponding to the base region and design region described above by laser processing. When forming a design region having a second grid pattern (i.e., having second concave portions), an embossing roll having engravings corresponding to the first grid pattern and the second concave portions of the design region is used. When forming a design region without the second grid pattern, an embossing roll having engravings corresponding to the second concave portions in the design region but not the second grid pattern in the design region can be used.

[0038] (Grid pattern) As described above, the base region in this embodiment can have a first grid pattern composed of first recesses and first protrusions. Similarly, the design region can further have second recesses and a second grid pattern composed of second recesses and second protrusions. The shape of each grid pattern in plan view is not particularly limited, but the regularly arranged sections can be defined, for example, by a specific mesh size.

[0039] In this embodiment, the "mesh size" of the first and second lattice patterns refers to the square root of the number of meshes (the number of convex portions) within a 1-inch (25.4 mm) square in each region. That is, if a first lattice pattern has 40,000 convex portions (islands) within a 1-inch (25.4 mm) square region, it is expressed as 200 mesh. The mesh size can be measured using a known shape measuring device such as a laser microscope or a microscope. For example, when the first and second lattice patterns are periodic lattice patterns, for each section of each lattice pattern, the length (unit: mm) from the center of one recess at one end to the center of the other recess at the center of the convex portion is measured at five different points in each of the X and Y directions, and the average value (L) is calculated. One inch (25.4 mm) is divided by the average value (L) to calculate the value (25.4 / L) in each of the X and Y directions. The square root of the product of these values ​​can be regarded as the mesh size. For example, if the average length (L) in the X direction from the center of the recess at one end to the center of the recess at the other end when the convex portion is centered is 0.166 mm, the number of stitches in the X direction is 25.4 mm / 0.166 mm = approximately 153. Similarly, if the number of stitches in the Y direction is calculated and it turns out to be approximately 153(Y), then the square root of 153(X) × 153(Y) = 23409(XY), that is, √(153(X) × 153(Y)) = 153(√XY), becomes the "mesh size" in this embodiment. Although there is no particular limitation, the "length (unit: mm) from the center of the recess at one end to the center of the recess at the other end for one grid pattern section when the protrusion is at the center" can be, for example, the length along either the X or Y direction in Figure 1.

[0040] The mesh size of the first grid pattern in the base region (for example, the square root of the number of first convex portions per square inch of the base region) is preferably 100 to 200 mesh, more preferably 100 to 150 mesh, and particularly preferably 120 to 150 mesh, from the viewpoint of further improving peelability and visibility. When a second lattice pattern consisting of second recesses and second protrusions is formed in the picture area, the mesh size of the second lattice pattern (i.e., the square root of the number of second protrusions per square inch of the picture area) is preferably 50 to 150 mesh, more preferably 50 to 100 mesh, and particularly preferably 50 to 70 mesh, from the viewpoint of further improving peelability and visibility. In order to further enhance visibility, the difference [|M1-M2|] between the mesh size [M1] of the first lattice pattern and the mesh size [M2] of the second lattice pattern is preferably 50 mesh or more, more preferably 80 mesh or more, and particularly preferably 100 mesh or more. Similarly, from the viewpoint of further improving visibility, it is preferable that the mesh size of the second grid pattern is smaller than the mesh size of the first grid pattern. Furthermore, in terms of a combination of the mesh size of the first grid pattern and the mesh size of the second grid pattern, from the viewpoint of further enhancing visibility, it is preferable that the mesh size of the first grid pattern is 100 to 200 mesh (preferably 100 to 150 mesh) and the mesh size of the second grid pattern is 50 to 150 mesh (even more preferably 50 to 100 mesh). In this combination, it is even more preferable that the difference [|M1-M2|] between the mesh size [M1] of the first grid pattern and the mesh size [M2] of the second grid pattern is 50 mesh or more, and it is particularly preferable that the mesh size of the second grid pattern is smaller than the mesh size of the first grid pattern.

[0041] The resin layer may have a sea-island structure formed on the entire surface (food-placing surface) of the resin layer or on part of the surface, but it is preferable to form a sea-island structure on the entire surface of the resin layer excluding the patterned area, as this can improve the peelability and uniformity of the fire resistance in a more balanced manner.

[0042] The food cooking sheet may have a release layer formed on the other side of the aluminum foil (e.g., the side opposite the side on which food is placed). The release layer may be formed from, for example, any of the resins exemplified for the resin layer. [Example]

[0043] Hereinafter, the embodiments of the present invention will be specifically described with reference to examples and comparative examples, but the present invention is not limited to the following examples and comparative examples in any way.

[0044] [Examples and Comparative Examples] Silicone resin (commercially available silicone release agent (for light release applications)) was applied at 0.2 g / m to one glossy side (the reverse side was matte finish) of 12 μm thick 1100 (alloy number) aluminum foil. 2 A resin layer was formed by coating. The surface of the resin layer was then embossed to form the shapes and properties shown in Tables 1 to 4, forming a sea-island structure in the base region (i.e., first convex portions and concave portions) and a pattern region (i.e., second convex portions and concave portions). The sea-island structure of each food cooking sheet was such that each first convex portion surrounded by a first concave portion was a square of approximately the same area in a plan view, and the first convex portions and first concave portions were regularly arranged to form a grid-like base pattern (first grid pattern). In some Examples, a grid-like pattern was formed in the pattern composed of second convex portions by forming second concave portions. In this pattern, each second convex portion surrounded by a second concave portion was a square of approximately the same area in a plan view, and a grid-like pattern (second grid pattern) was formed in which the second convex portions and second concave portions were regularly arranged.

[0045] The resin layer (food-placing surface) of each of the food cooking sheets in the Examples and Comparative Examples was evaluated as follows, and the results are shown in the table below.

[0046] (Height of the picture area based on the height of the first convex portion) The resulting food cooking sheet was firmly fixed on a smooth, hard glass plate, ensuring no wrinkles or undulations, and then fixed firmly on the measuring stage of an Olympus laser microscope (product name: LEXT OLS4000), ensuring no wobble. The height difference (unit: μm, rounded to the nearest whole number) between the first convex portions of the base region and the picture region was measured within any linear section (base region: approximately 0.8 mm, picture region: approximately 0.8 mm) at the boundary between the base region and the picture region. When the picture region consisted of only second convex portions or a combination of second convex portions and second concave portions, the height difference between the first convex portions of the base region and the second convex portions of the picture region was measured and used as the "height of the picture region relative to the height of the first convex portions." When the pattern area was formed only by the second recesses, the distance from the first protrusion in the base area to the lowest point of the second recess was measured and used as the "height of the pattern area based on the height of the first protrusion." Measurements were taken at five different locations, and the average value (rounded to the nearest decimal place) was used. [Measurement conditions] Objective lens: 20x (magnification: 432x)

[0047] (mesh size) The mesh sizes of the first and second grid patterns were measured as follows. Using an Olympus laser microscope (product name: LEXT OLS4000) manufactured by Olympus Corporation, the length (unit: mm, to three decimal places) from the center of the recess at one end to the center of the recess at the other end of each grid pattern section was measured, with the protrusion at the center. Measurements were taken at five different locations, and the average value (L) (to three decimal places) was calculated. One inch (25.4 mm) was divided by this average value (L) to obtain 25.4 / L (rounded to the nearest whole number). This was used as the number of meshes in the X and Y directions. The square root of these values ​​(rounded to the nearest whole number) was then calculated to obtain the mesh size. If the grid pattern was not present, the mesh size was set to "0." [Measurement conditions] Objective lens: 20x (magnification: 432x)

[0048] (Ten-point average roughness (Rz) of the base area) The resulting food cooking sheet was firmly fixed on a smooth, hard glass plate, ensuring no wrinkles or undulations, and then the ten-point average roughness Rz of the base area was measured (unit: μm, rounded to the nearest decimal place) using a small surface roughness tester (product name: Surftest SJ-210) manufactured by Mitutoyo Corporation in a location where the plate was not wobbling, according to the following measurement conditions: Measurements were taken at five different locations, and the average values ​​(rounded to the nearest decimal place) are shown in the table below. [Measurement conditions] Applicable standard: JIS B0601-1994 Measurement speed: 0.5mm / s Measuring force: 0.75mN Stylus material: Diamond Stylus tip radius: 2μm Evaluation length: 4.0 mm λc:0.8mm λs:2.5mm

[0049] (Tape peeling force) Adhesive tape (3M Japan Co., Ltd. / Scotch / Eco-Pack / Ultra-Transparent Tape S / BP-24N / 24mm width) was applied to the food-receiving surface of the resulting food preparation sheet, and a 2kg load roller was rolled back and forth across the tape to press the tape against the resin layer surface of the food preparation sheet. Then, while maintaining a 45° peel angle between the food preparation sheet and the adhesive tape, the maximum force (unit: N, rounded to two decimal places) was measured when the adhesive tape was quickly peeled off in the longitudinal direction according to the following measurement conditions. Measurements were also taken at five different locations, and the average values ​​(rounded to two decimal places) are listed in the table below. [Measurement conditions] Peeling speed: 36m / min Peeling length: 15cm Peeling angle: 45°

[0050] (Separability of ingredients: Cooking test method) The test was conducted using the following method, with reference to Appendix B "Hotcake release test method" of JIS K 6894 "Test method for fluororesin coating film on metal substrate." The test solution was prepared by taking the egg white from a commercially available chicken egg, stirring it until it was homogenous, then adding tap water to make it 80% (w / w), and stirring it again until it was homogenous, taking care not to create bubbles.A Panasonic induction cooking heater (product name: CH-MRS6L) was used as the heating device. The food cooking sheets of each Example and Comparative Example were placed on a frying pan (φ24 cm) with the food placement surface facing up, and a φ50 mm circle ring (height 40 mm) was placed on the food placement surface of the sheet. Next, 10 ml of the test liquid was poured into the circle ring, the lid was placed, and heating was initiated by adjusting the heat to "5 (medium heat)." After 3 minutes, heating was stopped, and the food cooking sheet with the circle ring placed on it was quickly moved to a flat surface. The circle ring was then pulled horizontally against the food cooking sheet at a speed of approximately 20 m / min, and the presence or absence of adhesion of the heated egg white to the food cooking sheet was evaluated according to the following criteria. The results are shown in the table below. [Removability criteria] A: There was almost no resistance when pulling the circle ring. Furthermore, no heated egg white was found to adhere to the food cooking sheet. B: There was some resistance when the circle ring was pulled, but no heated egg white adhered to the food cooking sheet. C: Heated egg white was attached to the food preparation sheet.

[0051] (Visibility of the image) The visibility of the image was judged comprehensively using the following three criteria.

[0052] Judgment criteria 1) Ten-point average roughness Rz of the base area A:10μm or more B: 3 μm or more and less than 10 μm C: Less than 3 μm

[0053] Criterion 2) Mesh size of the first grid pattern in the base area A: 150 mesh or more B: 100 mesh or more and less than 150 mesh C: Less than 100 mesh

[0054] Criterion 3) Difference between the mesh size of the first grid pattern (M1) and the mesh size of the second grid pattern (M2) (M1-M2) However, when the picture area does not have a second grid pattern, the mesh size (M2) of the second grid pattern is set to "0". A: 100 mesh or more B: 50 mesh or more and less than 100 mesh C: Less than 50 mesh

[0055] Overall judgment) A (very good visibility): All of the criteria 1) to 3) above are A B (Good visibility): In the criteria 1) to 3), B is present and C is absent. C (poor visibility): C is present in the criteria 1) to 3) above.

[0056] [Table 1]

[0057] [Table 2]

[0058] [Table 3]

[0059] [Table 4] [Explanation of symbols]

[0060] 100: food cooking sheet, 10: resin layer, 12: base region, 12C: first convex portion, 12R: first concave portion, 12P: first grid pattern, 14: design region, 14C: second convex portion, 14R: second concave portion, 14P: second grid pattern

Claims

1. an aluminum foil having a food-receiving surface on at least one side; a peelable resin layer laminated on the food placement surface of the aluminum foil; A food cooking sheet comprising: The resin layer is a base region having a sea-island structure in which, in a plan view, the first concave portions are seas and the first convex portions are islands, the seas are continuously formed, and the base region has a plurality of islands; a pattern area that is formed in at least one of the second convex portion and the second concave portion and that constitutes a design; the height of the pattern region relative to the height of the first convex portion is −30 μm or more and +30 μm or less, The food cooking sheet, wherein the pattern area has a second grid pattern made up of the second recesses and the second protrusions.

2. 2. The food cooking sheet according to claim 1, wherein the base region has a first grid pattern made up of the first recesses and the first protrusions.

3. the base region has a first grid pattern configured with the first concave portions and the first convex portions, 2. The food cooking sheet according to claim 1, wherein the difference between the mesh size of the first grid pattern and the mesh size of the second grid pattern is 50 meshes or more.

4. 4. The food cooking sheet of claim 3, wherein the mesh size of the second grid pattern is smaller than the mesh size of the first grid pattern.

5. The mesh size of the first grid pattern is 100 to 200 mesh, and The mesh size of the second grid pattern is 50 to 150 mesh. The food cooking sheet according to claim 3 or 4.

6. The food cooking sheet according to any one of claims 1 to 5, wherein the ten-point average roughness (Rz) of the base region is 3 µm to 40 µm.

7. The food cooking sheet according to any one of claims 1 to 6, wherein the resin layer comprises at least one resin selected from the group consisting of silicone resins and fluororesins.

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