Packaging container for sushi

Abstract

The invention provides a sushi packaging container which is provided with legs but has a small shape, and the sushi packaged in the sushi packaging container can be easily clamped by chopsticks under the condition that the sushi packaging container is provided with a carrying part for carrying each sushi. A sushi packaging container (1) which is formed from a synthetic resin sheet and has, on a bottom surface portion (21), a plurality of individual placement surface portions (24) on which sushi are placed, the sushi packaging container (1) being provided with: a peripheral wall portion (22) provided around the bottom surface portion (21); a step section (23) in which the boundary between the peripheral wall section (22) and the bottom surface section (21) is formed in a stepped shape, and the upper surface of the step section (23) is a stepped surface section (23a); a ridge section (25) provided at the same height as the stepped surface section (23a) and provided around each of the individual placement surface sections (24); a recess (26) in which a portion of the periphery of each individual placement surface (24) is formed to have the same height as the bottom surface (21) or to have a height equal to or lower than the bottom surface (21); and leg parts (27) formed by recessing the bottom surface part (21) downward from the interior of the individual placement surface part (24).

Description

Technical Field

[0001] The present invention relates to a sushi packaging container which is formed of a synthetic resin sheet and is used to pack sushi. Background Art

[0002] In retail stores such as department stores, supermarkets, and convenience stores, it is often seen that so-called packaged sushi, in which nigiri sushi and hand-rolled sushi are placed in packaging containers, is displayed and sold in the store. Various studies have been conducted on containers for such packaged sushi.

[0003] For example, in a container for packaging sushi, the following situation sometimes occurs: the sushi placed adjacent to each other is tightly pressed together, and the sushi is shifted when being transported or picked up. In order to prevent this situation from occurring, there is a container in which the bottom surface is divided into placing portions, and sushi can be placed in each placing portion.

[0004] More specifically, the following sushi packaging containers have been developed: a packaging container having a sushi-shaped recessed portion at the bottom (see Patent Document 1 below); a sushi packaging container having a recessed portion of a size that allows the lower portion of the sushi to fit in order to accommodate sushi separately (see Patent Document 2 below); a packaging container having a peripheral wall of locally different heights on the outer side of the periphery of a storage portion (see Patent Document 3 below); and a sushi packaging container having a protruding portion on the bottom portion for placing sushi that extends between sushi that are arranged in a matrix and are inclined one by one (see Patent Document 4 below).

[0005] In addition, in order to attract the attention of customers, there is a sushi container with a food base provided on the outer periphery of the container body, and the top end of the sushi food is placed on the food base to give it a sense of volume (see Patent Document 5 below).

[0006] In addition, a container with a suspended bottom or legs that allows sushi to be placed on top has been developed to make it more eye-catching and give it a sense of volume.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Utility Model Registration No. 3062105

[0010] Patent Document 2: Japanese Patent Application Publication No. 2002-95429

[0011] Patent Document 3: Japanese Patent Application Publication No. 2012-101816

[0012] Patent Document 4: Japanese Patent Application Publication No. 2012-176773

[0013] Patent Document 5: Japanese Patent Application Publication No. 2011-157113 Summary of the invention

[0014] Problem that the invention aims to solve

[0015] When the bottom surface of the container for packaging sushi is divided into sections to form the placing sections, protrusions may be provided to surround the circumference of each placing section to prevent the sushi from being easily displaced.

[0016] However, when the sushi is surrounded by the protrusion, when the chopsticks are used to pick up the sushi, the tip of the chopsticks may hit the protrusion, making it difficult to pick up the sushi.

[0017] In addition, when the container for packaging sushi is provided with legs, most of them are provided at the outside of the placement surface for placing sushi and at the inside of the flange. At this time, since the legs need space, the outer shape of the container is easy to become larger.

[0018] When the outer shape of the container becomes larger, even if sushi is put in, there will be more empty space. In addition, since the area of ​​the placing portion for placing sushi becomes relatively smaller, the storage capacity will appear small, which may reduce purchasing power.

[0019] Therefore, an object of the present invention is to provide a sushi packaging container which has a small outer shape despite having legs and which is easy to pick up the packed sushi with chopsticks even when a placing portion for placing individual sushi is provided.

[0020] Solutions for solving problems

[0021] A sushi packaging container according to one technical solution of the present invention is formed of a synthetic resin sheet and has a plurality of separate placing surfaces on a bottom surface for placing individual sushis, and is characterized in that the sushi packaging container comprises: a peripheral wall portion, which is arranged around the bottom surface; a step portion, which is formed by forming a boundary between the peripheral wall portion and the bottom surface into a step shape and setting the upper surface as a step surface; a protrusion portion, which is set to the same height as the step surface and is arranged around each of the separate placing surfaces; a recessed portion, which is formed by forming a part of the surrounding of each of the separate placing surfaces to be the same height as the bottom surface or a height below the bottom surface; and a leg portion, which is formed by making the bottom surface depressed downward from within the separate placing surface.

[0022] In the sushi packaging container of the above technical solution, the ridges are used to surround the surrounding of the single placement face, so the sushi placed is not easy to shift and move. Moreover, since the concave portion is not completely surrounded but is provided locally, the top of the chopsticks is not easy to hit the ridges in this part, and it is easy to use chopsticks to pick up the sushi. In addition, since the legs are formed in the single placement face, it is not necessary to enlarge the outer shape as in the past, and the size of the container can be made compact. Moreover, by providing the step portion, the outer shape is made compact, and the top of the sushi ingredients of the nigiri sushi is arranged on the step face and is not easy to be flattened, which can make the ingredients of the sushi look beautiful.

[0023] In the sushi packaging container of the above technical solution, the protrusions may include parallel protrusions and cross protrusions, the parallel protrusions continuously extending from the step and arranged in parallel, and the cross protrusions arranged in a direction orthogonal to the parallel protrusions. By setting such a structure, the parallel protrusions and cross protrusions can be used to surround the individual loading surface, and the sushi can be arranged in a matrix vertically and horizontally. In addition, since the protrusions extend from the step and are arranged in parallel, the periphery of the container is not easily deformed and is easy to pick up.

[0024] In the sushi packaging container of the technical solution, the notch may be provided between the parallel ridges and the cross ridges. By setting such a structure, the top end of the chopsticks can be used to clamp the sushi along the cross ridges, and the sushi can be easily clamped.

[0025] In the sushi packaging container of the technical solution, the recessed portion may be arranged at the facing positions in each of the individual placement surfaces. By being set to such a structure, there are recessed portions on both sides of the sushi, so it is easy to use chopsticks to clamp the sushi from both sides.

[0026] In the sushi packaging container of the technical solution, the leg portion may be formed into a slender linear recess. By setting it as such a structure, the leg portion has the function of supporting the container, and not only that, it also has the function of serving as a storage portion capable of storing water etc. that seeps out of sushi ingredients. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The sushi packaging container according to the first embodiment of the present invention is shown in a perspective view in a lid-open state.

[0028] Figure 2 yes Figure 1 A front view of a container body and a lid body of a sushi packaging container.

[0029] Figure 3 yes Figure 1A top view of a container body of a sushi packaging container.

[0030] Figure 4 yes Figure 1 A top view of a lid of a sushi packaging container.

[0031] Figure 5 yes Figure 1 A cross-sectional view near the center of a sushi packaging container.

[0032] Figure 6 It means in Figure 1 A cross-sectional view showing a state in which sushi is packed in a sushi packaging container.

[0033] Figure 7 It is a top view showing a sushi packaging container according to a second embodiment of the present invention.

[0034] Figure 8 It is a top view showing a sushi packaging container according to a third embodiment of the present invention. DETAILED DESCRIPTION

[0035] Hereinafter, embodiments of the sushi packaging container according to the present invention will be described based on the drawings.

[0036] like Figure 1 or Figure 2 As shown, a sushi packaging container 1 according to a first embodiment of the present invention includes a container body 2 and a lid 3 that covers the container body 2 .

[0037] In the present embodiment, the cover body 3 is provided, but a configuration may be adopted in which the cover body 3 is not provided.

[0038] The sushi packaging container 1 is formed into a horizontally long rectangular parallelepiped shape, and can be set to a size of about 50 mm in height, 200 mm in length, and 150 mm in width without particular limitation, and can store sushi such as nigiri sushi, maki sushi, inari sushi, and pressed sushi.

[0039] In addition, nigiri sushi refers to sushi made by placing slices of raw fish and shellfish, thick omelette (hereinafter referred to as sushi ingredients), etc. on vinegar rice (rice mixed with vinegar, the same below) and squeezing it tightly, pressed sushi refers to sushi made by putting vinegar rice into a square mold, placing sushi ingredients on it and squeezing it, inari sushi refers to a dish made by putting sweet-boiled fried tofu (thinly sliced ​​tofu fried in oil) into a mixture of various ingredients in vinegar rice, and maki sushi refers to sushi made by rolling sushi ingredients with dried nori (algae dried in a plate shape), thick omelette, etc.

[0040] The shapes of these various sushi are not particularly limited, and may be in the shape of a cube, a rectangular parallelepiped, a cylinder, or the like.

[0041] The sushi packaging container 1 is not limited to the above-mentioned shape, and can be, for example, a circular shape or an oval shape in plan view, or a quadrilateral shape such as a triangle, a square, a rectangle, a parallelogram, or a trapezoid, or a polygonal shape in plan view such as a pentagon, a hexagon, or an octagon.

[0042] like Figure 3 As shown, the container body 2 is formed into a rectangular flat disk with one pair of corners being chamfered and the other pair of corners being rounded when viewed from above. Figure 1 , Figure 3 as well as Figure 5 As shown, the container body 2 comprises: a bottom portion 21; a peripheral wall portion 22, which is arranged in a manner to surround the bottom portion 21 and stands upward; a step portion 23, which is formed by making the boundary between the peripheral wall portion 22 and the bottom portion 21 into a step shape; a separate loading surface portion 24, which is arranged to divide the bottom portion 21; a protrusion portion 25 (25a~25c), which surrounds the separate loading surface portion 24; a recessed portion 26, which is arranged in a part around the separate loading surface portion 24; and a leg portion 27, which is formed to be recessed downward from the separate loading surface portion 24.

[0043] like Figure 1 or Figure 3 As shown, the bottom surface 21 is a horizontal plane in a rectangular shape when viewed from above on which sushi can be placed, and the surface is divided into a rectangular or parallelogram shape by a protrusion 25, and a separate placing surface 24 on which each sushi can be placed is provided. The bottom surface 21 can be a smooth surface, or the entire surface or a part thereof can be a concave-convex surface such as a corrugated or knurled surface with repeated minute concave-convex shapes. By making the bottom surface 21 a concave-convex surface, the contact area between the sushi and the bottom surface 21 becomes small, and the adhesion of the sushi can be suppressed, making it easy to take out the sushi.

[0044] exist Figure 2 or Figure 3 In the orientation, the individual placement surface portions 24 are provided in four rows in the left-right direction and two rows in the front-back direction, and the individual placement surface portions 24 are arranged in an inclined shape with respect to the edge of the container body 2. In the present embodiment, the individual placement surface portions 24 are formed in an inclined shape with respect to the edge of the container body 2 at an angle of about 45°, but the present invention is not limited thereto, and may be formed in a vertical or parallel shape with respect to the edge of the container body 2.

[0045] If a part of the bottom surface 21 in the individual placement surface 24 is made into a concavoconvex surface and the remaining part is made into a smooth surface, the sushi can be prevented from sticking and the sushi can be fixed (non-slip) by contact with the smooth surface. In this case, the area occupancy rate of the concavoconvex surface is preferably 70% or less in the individual placement surface 24, and more preferably 50% or less.

[0046] like Figure 5 As shown, the peripheral wall portion 22 is formed to stand up from the peripheral edge of the bottom surface portion 21 and expand upward. A flange portion 22a extending outward from the container body 2 is provided at the upper edge of the peripheral wall portion 22, and a skirt portion 22b formed in a manner that expands outward in a J-shaped cross section is provided at the outer edge of the flange portion 22a.

[0047] A step portion 23 formed in a step shape is provided at a boundary between the peripheral wall portion 22 and the bottom surface portion 21 , and the upper surface thereof is a horizontal step surface portion 23 a .

[0048] The step portion 23 is provided to improve the rigidity of the container body 2, so that it is not easy to bend when the container body 2 is picked up. In addition, when sushi is placed on the separate placement surface 24, the top end of the sushi ingredients extends to the space on the step surface 23a, and the ingredients can be arranged in the container in a manner that is not compressed or flattened.

[0049] The protrusions 25 are formed by bulging the bottom surface 21 upward, and are provided around and partition each individual placement surface 24. Each individual placement surface 24 is not entirely surrounded by the protrusions 25, but has a through portion as a notch 26 partially formed therein.

[0050] The protrusion 25 is set to have the same height as the step surface portion 23a, preferably within the range of ±3 mm, more preferably within the range of ±1 mm, and particularly preferably the same height (including the range of design error).

[0051] like Figure 3 As shown, the protrusion portion 25 is constructed to include: parallel protrusion portions 25a, which extend continuously from the step portion 23, are arranged in parallel in an inclined direction at approximately equal intervals, and divide the container body 2 in the left and right directions; and cross protrusion portions 25b, which are arranged on the central cross-section line of the container body 2, are set in a direction orthogonal to the parallel protrusion portions 25a, and divide the container body 2 in the front and rear directions.

[0052] like Figure 3 As shown in the figure, the parallel protrusions 25a are formed by linear protrusions 25 extending obliquely (at about 45°) from the edges near the front side and the back side, and the base end side of each protrusion 25 is formed into a triangular shape in plan view and has a wide width. Each protrusion 25 of the parallel protrusions 25a has a length of about 1 / 3 of the front-to-back width of the container body 2. In the present embodiment, three protrusions 25 are provided at the edges near the front side and the back side to form the parallel protrusions 25a, but the present invention is not limited thereto.

[0053] By providing the parallel protrusions 25 a at the edges near the front side and the back side, the container body 2 is less likely to bend, and the container body 2 can be easily picked up by gripping the short edge portions on both sides.

[0054] like Figure 3 As shown, the cross ridge 25b is formed into a straight line wider than the parallel ridge 25a, and is arranged in a direction orthogonal to the parallel ridge 25a. Each individual loading surface 24 is surrounded by the parallel ridge 25a, the cross ridge 25b and the peripheral wall 22 of the container body 2 to divide it.

[0055] In this embodiment, end protrusions 25c extending in a tongue-like manner from the left and right edges of the container body 2 are further provided. The end protrusions 25c are arranged along the central cross-sectional line to divide the separate placement surface portions 24 provided at the left and right ends.

[0056] The recessed portion 26 is provided at least at one place around each individual placement surface portion 24, and is formed to be at the same height as or lower than the bottom surface portion 21. By providing the recessed portion 26, the tip of the chopsticks can clamp the sushi without being caught in the protrusion 25, and can be easily picked up. In this embodiment, a through-shaped recessed portion is provided between the tip of the parallel protrusion 25a and the end of the cross protrusion 25b, and the recessed portion 26 is provided so that the portion is lower than the bottom surface portion 21. In addition, by providing the recessed portion 26 at two places and arranging them in a manner facing each other, it is easy for the chopsticks to pass through from both sides, making it easier to pick up the sushi.

[0057] The opening width of the notch 26 is not particularly limited, but is preferably 15 mm to 5 mm, and more preferably 12 mm to 8 mm. In addition, the height of the portion provided with the notch 26 is preferably set to a height within the range of ±1 mm relative to the bottom surface 21, and more preferably the same height (including within the range of design error).

[0058] The leg portion 27 is formed into a concave shape by concavely ...

[0059] Since the leg portion 27 is formed in the individual placement surface portion 24 , there is no need to increase the outer shape of the container body 2 , and the outer shape of the container body 2 can be made compact.

[0060] like Figure 1 , Figure 2 or Figure 4 As shown, the cover 3 is formed into a substantially trapezoidal table shape. Figure 5As shown, the cover body 3 includes: a top surface portion 31; a side wall surface portion 32, which extends downward from the periphery of the top surface portion 31; a flange portion 33, which extends from the lower edge of the side wall surface portion 32 to the outside of the cover body; a skirt portion 33a, which protrudes downward from the flange portion 33; and a fitting portion 34, which is provided on the skirt portion 33a and fits with the outer edge portion of the container body 2.

[0061] like Figure 4 As shown, the top surface portion 31 is a horizontal surface in a deformed rectangular shape when viewed from above.

[0062] The side wall surface portion 32 is an inclined surface that is inclined downward from the peripheral edge of the top surface portion 31 .

[0063] like Figure 5 As shown, the flange 33 is formed into an inclined surface that rises toward the outside of the cover. A skirt 33a facing downward is provided on the outer edge of the flange 33, and a fitting portion 34 protruding toward the inner side of the cover 3 and locked to the lower side of the outer edge of the container body 2 is provided on the skirt 33a.

[0064] The fitting portion 34 is formed to have an appropriate length extending in the circumferential direction and is provided at intervals in the circumferential direction of the cover body 3. In the present embodiment, the cover body 3 is an external fitting structure that is fitted into the container body 2 from the outside, but it is not limited to this, and any fitting structure of an internal fitting structure, an internal and external fitting structure, etc. can also be adopted. In addition, it can also be set to a structure in which the cover body 3 is placed on the container body 2 without fitting.

[0065] Hereinafter, an example of a method for producing the sushi packaging container 1 will be described.

[0066] The container body 2 and the cover body 3 are not particularly limited and can be manufactured by thermoforming a synthetic resin sheet. The synthetic resin sheet may be either a non-foamed resin sheet or a foamed resin sheet, but the container body 2 is preferably a foamed resin sheet and the cover body 3 is preferably a non-foamed resin sheet.

[0067] In the case of a non-foamed resin sheet, specifically, a sheet having a thickness in the range of 0.1 mm to 2.0 mm is preferably used, and a sheet having a thickness in the range of 0.2 mm to 1.2 mm is particularly preferably used.

[0068] In the case of a foamed resin sheet, a sheet with a thickness of 0.5 mm to 4.0 mm is preferably used, and a sheet with a thickness of 0.7 mm to 2.2 mm is particularly preferred. In addition, in the case of a foamed resin sheet, the foaming ratio is preferably set to 1.05 to 20.0 times, and particularly preferably to 1.5 to 15.0 times.

[0069] As the non-foamed resin sheet, for example, the following thermoplastic resin sheets can be used: polyolefin resin sheets such as polyethylene resin sheets and polypropylene resin sheets; polystyrene resin sheets; polyester resin sheets such as polyethylene terephthalate resin sheets and heat-resistant modified polyethylene terephthalate resin sheets. In addition, materials that can withstand heating in a microwave oven, such as heat-resistant polystyrene resin sheets, polypropylene resin sheets, and heat-resistant modified polyethylene terephthalate resin sheets, can also be used.

[0070] As the foamed resin sheet, for example, a foamed polyolefin-based resin sheet, a foamed polystyrene-based resin sheet, or a foamed polyester-based resin sheet such as foamed polyethylene terephthalate can be used.

[0071] A laminated sheet formed by stacking synthetic resin sheets may also be used. Examples of the laminated sheet include a laminated sheet in which a resin film is thermally laminated on a non-foamed resin sheet or a foamed resin sheet, a laminated sheet obtained by a co-extrusion method, and a laminated sheet obtained by an extrusion lamination method.

[0072] Biomass plastics can be used as the non-foamed resin sheet, the foamed resin sheet, and the laminated sheet.

[0073] Biomass plastics refer to polymer materials obtained by chemical or biological synthesis using substances derived from renewable organic resources as raw materials. Compared with petroleum-derived resins, biomass plastics can reduce the amount of carbon dioxide emitted into the atmosphere and reduce the impact on the environment.

[0074] Examples of biomass plastics include polylactic acid resin, biomass polyethylene, and biomass polyethylene terephthalate.

[0075] Examples of the thermoforming include vacuum forming, pressure forming, vacuum pressure forming, hot plate forming, and the like.

[0076] The container body 2 and the cover body 3 are preferably colored, such as black or white, and may be transparent or translucent so that the interior can be visually identified. The cover body 3 is preferably transparent. In addition, the surface of the container body 2 and the cover body 3 may be printed or engraved with text, patterns, etc. to the extent that visibility is not hindered in the case of transparency or translucency.

[0077] Moreover, ribs for reinforcement or embossing for anti-slip may also be provided at appropriate positions. In addition, stacking protrusions that bulge out in a cube or rectangular parallelepiped may also be provided at appropriate positions of the container body 2 and the lid 3.

[0078] Hereinafter, as an example of the method of using the sushi packaging container 1, a case of placing nigiri sushi S will be described. The nigiri sushi S is formed by placing rectangular fish slices S2 on rectangular parallelepiped rice S1.

[0079] like Figure 6 As shown, each nigiri sushi S is placed on the separate loading surface 24 of the container body 2, the cover body 3 is covered on the container body 2, and the cover body 3 is pressed from above so that the interlocking portion 34 is embedded in the outer edge of the container body 2, and the nigiri sushi S can be placed in the sushi packaging container 1.

[0080] The sushi packaging container 1 can be opened by placing fingertips or the like on the lower end of the skirt portion 33 a of the lid 3 to spread it, releasing the engagement state of the engagement portion 34 and picking up the lid 3 .

[0081] like Figure 6 As shown, in the sushi packaging container 1, since each nigiri sushi S is surrounded by the protrusion 25 and the peripheral wall 22 of the container body 2, the nigiri sushi S is unlikely to be displaced even when the container 1 is picked up.

[0082] In addition, since the leg portion 27 is provided in the separate placement surface portion 24, the outer shape of the container body 2 can be made compact. Furthermore, by providing the step portion 23, the top end of the ingredients of the nigiri sushi S is arranged on the step surface portion 23a, and the top end of the ingredients is not crushed, so that the ingredients of the nigiri sushi S can look beautiful.

[0083] When using chopsticks or the like to pick up the nigiri sushi S, the chopsticks can easily pick up the nigiri sushi S without getting caught in the protrusions 25 due to the recessed portion 26. In addition, since the leg portion 27 is formed as a recessed portion, water seeping out of the nigiri sushi S is stored there, so that the water is not easy to disperse.

[0084] exist Figure 7 A sushi packaging container 1a according to a second embodiment is shown.

[0085] like Figure 7 As shown, the container body 2a of the sushi packaging container 1a is provided with four rows of individual placement surfaces 24 in the left-right direction, and one row of individual placement surfaces 24 in the front-back direction, and the legs 27 are provided between the individual placement surfaces 24 and the peripheral wall 22 near the front side and the back side, and are provided inside the individual placement surfaces 24 on the left and right sides. As a result, the front-to-back width of the container 1a is increased, but the left-to-right length can be reduced compared to the past, and the container 1a as a whole can be made more compact than the past.

[0086] exist Figure 8 A sushi packaging container 1b according to a third embodiment is shown.

[0087] like Figure 8As shown, the container body 2b of the sushi packaging container 1b is provided with 4 rows of separate placement face portions 24 in the left-right direction and 3 rows of separate placement face portions 24 in the front-back direction, and the separate placement face portions 24 near the center are surrounded by the cross ridge portions 25b. In addition, not all of the separate placement face portions 24 are provided with the legs 27. Even so, as with the container 1 of the first embodiment, it is possible to make the nigiri sushi less likely to shift and move, and to make the outer shape compact.

[0088] The configurations of the above-described embodiments are not intended to limit the content of the present invention, and modifications are possible as long as the technical purpose remains the same, and the present invention includes such modifications.

Claims

1. A sushi packaging container, which is formed of a synthetic resin sheet and has a plurality of individual placement surfaces on the bottom surface for placing individual sushi, wherein: The sushi packaging container has: A peripheral wall portion, which is arranged around the bottom portion; a step portion, wherein the boundary between the peripheral wall portion and the bottom portion is formed into a step shape, and the upper surface thereof is set as a step surface; a protrusion portion, which is set to the same height as the step surface portion and is provided around each of the individual placement surfaces; a recessed portion formed by partially forming the periphery of each of the individual placement surface portions to be at the same height as the bottom surface portion or at a height lower than the bottom surface portion; and The leg portion is formed by making the bottom surface portion depressed downward from within the separate placement surface portion.

2. The sushi packaging container according to claim 1, wherein: The protrusions are configured to include parallel protrusions that extend continuously from the step portion and are arranged in parallel, and cross protrusions that are arranged in a direction orthogonal to the parallel protrusions.

3. The sushi packaging container according to claim 2, wherein: The recessed portion is provided between the parallel ridge portion and the intersecting ridge portion.

4. The sushi packaging container according to claim 3, wherein: The recessed portions are provided at opposing positions of the individual placement surface portions.

5. The sushi packaging container according to claim 1 or 2, wherein: The leg portion is formed as an elongated linear recess.

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