JP2018177261A - Container with lid, container lid and detaching method of container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container with lid, which allows the container lid to be easily detached from the opening container body after heat shrinkage.SOLUTION: As for container with lid 1 comprising an opening container main body 2 which is thermoformed from a synthetic resin sheet and contracts when heated and a container lid 3 detachably fitted to the opening container main body 2; in the fitted state, an engaging convex part 4 provided along an opening edge 6a of the opening container body 2 and a first engaging concave part 5 provided on the inner surface of the container lid 3 are engaged with each other; a second engagement recess 7 is provided on the inner side surface on a central C side of the inner side surface than the first engagement recess 5; the second engagement recess 7 is formed in a substantially similar shape having a dimensional difference equivalent to the thermal contraction margin of the engagement projection 4 of the open container body 2 with respect to the first engagement recess 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lidded container, a container lid and a method of detaching a container lid, and more particularly, a lidded container comprising an open container main body which shrinks by heating, a container lid which can be fitted to an open container main body which shrinks by heating and The present invention relates to a method of detaching a container lid for detaching a container lid that can be fitted to an open container body.

  Conventionally, there is a lidded container provided with an open container main body which is thermoformed from a synthetic resin sheet and shrunk by heating, and a container lid detachably fitted to the container main body.

  The open container main body is obtained by heating the synthetic resin sheet and thermoforming by applying a force so as to follow the mold, and releasing the mold from the mold after cooling. It is known that such an open container main body causes “heat shrinkage” which reduces in size by heating even after being formed once.

  Therefore, the container lid of the lidded container must be detachably fitted to both the open container main body before heat contraction and the open container main body after heat contraction.

  Therefore, as shown in FIGS. 17 (a) and 17 (b), the conventional lidded container 51 includes an open container main body 52 which shrinks by heating, and a container lid 53 which is detachably fitted to the open container main body 52. There is a structure in which a flange-shaped engaging convex portion 54 provided on the opening container main body 52 and an engaging concave portion 55 provided on the container lid 53 engage with each other (Patent Document 1).

  That is, the engagement recess 55 includes a flange portion 53a of the container lid 53, a plurality of protrusions 55a projecting inward from the peripheral edge of the flange portion 53a, and a valley portion 55b formed between the plurality of protrusions 55a in the circumferential direction. And. The engagement convex portion 54 is engaged with the engagement concave portion 55 by being sandwiched between the flange portion 53a and the plurality of protrusions 55a in the vertical direction in FIG. 17B of the lidded container 51.

  Thus, in the case of the conventional lidded container 51, the engagement convex portion 54 locks the projection 55a of the engagement concave portion 55 downward in FIG. 17B so that the container lid 53 is not pulled out of the opening container main body 52. Have a structure that In the conventional lidded container 51, the opening convex portion 52 before heat shrinking and the open container main body 52 after heat shrinking are engaged projections of the engaging concave portion 55 in advance in view of the dimensional change due to the heat contraction. It is designed in a size that enables engagement and disengagement with the part 54.

  As a result, the container lid 53 of the conventional lidded container 51 can be detachably fitted to any of the size of the open container main body 52 before heat contraction and the size after heat contraction.

Japanese Patent Application Laid-Open No. 11-240546

  By the way, the container with lid has a structure such that the container lid does not come out of the container body before and after heat contraction due to the engagement between the engaging portion of the opening container body and the engaging portion of the container lid It should be a structure that can be easily desorbed.

  On the other hand, when the thermal contraction of the opening container main body 52 is large compared to the protrusion height of the projection 55a, the container lid 53 is opened without maintaining the locked state by the engagement convex portion 54 in the conventional container 51 with lid Remove from the container body 52.

  If the projection height of the plurality of protrusions 55a is made larger in accordance with the thermal contraction of the container main body 52 in order to prevent such detachment, the engagement between the engaging portions 54, 55 becomes tight and engagement becomes difficult. That is, desorption between the open container body 52 and the container lid 53 can not be easily performed.

  In view of such problems, in the present invention, regardless of the degree of thermal contraction, the container lid can be easily detached from any of the open container main body before thermal contraction and the open container main body after thermal contraction. The purpose is to provide an attached container.

  The present invention is a lidded container comprising an open container main body thermoformed from a synthetic resin sheet and shrunk by heating, and a container lid detachably fitted to the open container main body, in the above fitted state An engagement convex portion provided along the opening edge of the open container main body and a first engagement recess provided on the inner side surface of the container lid, and the inner side surface is engaged with the first side surface; A second engagement recess is provided on the center side of the inner surface than the engagement recess of the second engagement recess, and the second engagement recess corresponds to the engagement in the open container main body with respect to the first engagement recess. It is an object of the present invention to provide a lidded container which is formed in a substantially similar shape having the same dimensional difference as the heat shrinkage margin of the convex portion.

  That is, in the present invention, the second engagement recess is formed in a substantially similar shape having the same dimensional difference as the thermal contraction margin of the engagement projection with respect to the first engagement recess. Even after heat contraction, it can be engaged with the engagement convex portion. As described above, the heat-shrinkage engagement portion engages with the second engagement recess instead of the first engagement recess, and the heat-shrinkage of the opening container main body and the container lid is performed even after heat contraction. Can be done easily.

  In addition, even when the thermal contraction of the open container main body is large, the desorption is easy because the dimensional difference is adjusted to the thermal contraction margin in advance.

  Moreover, in the lidded container of the present invention, since the second engagement recess is provided on the center side of the inner side surface of the container lid than the first engagement recess, the first engagement recess and the first engagement recess may be provided. A second engagement recess may be compactly disposed within the inner surface.

  Further, the container lid is fitted to the open container body, and the inner side surface has an inclined surface which is inclined so as to approach the center as it is separated from the bottom side of the open container body in the fitting direction. Each of the engagement recesses may be provided on the inclined surface so as to surround a center line passing through the center in the fitting direction.

  That is, since each said engaging recessed part is provided in an inclined surface, the container with a lid | cover of this invention can arrange | position the said 1st engaging recessed part and the said 2nd engaging recessed part in three dimensions.

  Therefore, even when the thermal contraction margin of the engagement convex portion is small and the dimensional difference between the engagement concave portions must be reduced, the respective engagement concaves are combined by three-dimensionally combining the respective engagement concave portions. The recess can be easily arranged on the inner side of the container lid.

  Furthermore, the engagement convex portion may form a flange portion that protrudes outward with respect to the center line from the opening edge of the open container main body.

  That is, in the lidded container of the present invention, since the outwardly projecting flange portion engages with the respective engagement concave portions, the engagement convex portion is thinned in the fitting direction of the lidded container. The respective engagement recesses may be arranged closely within the inner surface of the container lid.

  Therefore, even when the dimensional difference between the engaging projections before and after heat contraction is further reduced, and the dimensional difference between the engaging recesses must be reduced, the engaging recesses may be arranged close to each other. And can be easily disposed on the inner surface of the container lid.

  Further, according to the present invention, there is provided a container lid which can be detachably fitted to an open container main body which is thermoformed from a synthetic resin sheet and which is contracted by heating, the engagement being provided along the opening edge of the open container main body A first engagement recess which engages with the convex portion is provided on the inner side, and a second engagement recess is provided on the inner side on the center side of the inner side than the first engagement recess. The second engagement recess is formed to be substantially similar to the first engagement recess in the same size difference as the thermal contraction margin of the engagement protrusion in the open container main body. A container lid characterized by the present invention is provided.

  That is, in the container lid according to the present invention, the second engagement recess is substantially similar to the first engagement recess in the same dimension difference as the thermal contraction margin of the engagement protrusion of the open container main body covered. Because it is formed into a shape in advance, regardless of the degree of thermal contraction of the open container main body, it can be easily detachably fitted to the open container main body even after heat contraction of the open container main body. it can.

  Further, the container lid of the present invention is fitted to the open container main body, and the inner side surface approaches the center as it is separated from the bottom side of the open container main body in the fitting direction with the open container main body. It may have a slope which inclines, and each said engaging recess may be provided in the slope so that a centerline which passes through the center in the fitting direction may be surrounded.

  That is, in the container lid of the present invention, each of the engaging recesses is provided on the inclined surface, and these engaging recesses can be arranged three-dimensionally, so the dimensional difference between the engaging recesses must be reduced. Even when it is necessary, it can be easily disposed on the inner surface of the container lid.

  The present invention is a method of detaching a container lid for detaching a container lid fitted to the open container main body with respect to the open container main body which is thermoformed from a synthetic resin sheet and shrunk by heating, the opening of the open container main body And releasing the container lid from the open container main body while releasing the engagement between the engaging protrusion provided along the edge and the first engaging recess provided on the inner surface of the container lid. And after the step of heating the open container body after removing the container lid, and covering the open container body with the container lid after the heating step, and The second engaging recess, which is provided on the inner side surface on the center side of the first engaging recess, and has a substantially similar shape with the same dimensional difference as the thermal contraction margin of the engaging protrusion. Desorption of the container lid characterized in that it includes It is intended to provide the law.

  That is, depending on the method of detaching the container lid of the present invention, the engagement convex portion thermally shrunk by heating the open container main body is not in the first engagement concave portion engaged before heat contraction but in advance. In order to engage with the 2nd engagement recessed part formed according to the heat contraction of an engagement convex part, detachment with the above-mentioned opening container main part and a container lid can be performed easily.

  Furthermore, even when the thermal contraction of the open container main body is large, the opening can be adjusted in advance to match the dimensional difference between the first engagement recess and the second engagement recess with the thermal contraction margin of the engagement projection. Desorption of the container body and the container lid is easy.

  Further, the present invention is a method of detaching a container lid for detaching a container lid fitted to the open container main body with respect to the open container main body which is thermoformed from a synthetic resin sheet and contracts due to heating. The engagement convex portion provided along the opening edge and the first engagement concave portion provided on the inner side surface of the container lid are released from the engaged state, and the container lid is removed from the opening container main body And covering the open container body with the container lid after the step of filling the food in a high temperature state into the open container body after removing the container lid and filling the food. The engagement convex portion is provided on the inner side surface on the center side of the first engagement concave portion, and is formed in a substantially similar shape having the same dimensional difference as the thermal contraction margin of the engagement convex portion. Engaging the second engagement recess. Desorption process of the container closure, characterized in there is provided a.

  That is, according to the method of detaching the container lid of the present invention, the first engagement recess engaged with the engagement convex portion thermally shrunk by filling the food in the high temperature state into the open container main body before the thermal contraction. In order to engage with the second engaging recess formed in advance in accordance with the thermal contraction of the engaging projection, the opening container main body and the container lid can be easily desorbed.

  Furthermore, even when the thermal contraction of the open container main body is large, the opening can be adjusted in advance to match the dimensional difference between the first engagement recess and the second engagement recess with the thermal contraction margin of the engagement projection. Desorption of the container body and the container lid is easy.

  In the present invention, regardless of the degree of thermal contraction of the open container main body, it is possible to provide a lidded container in which the container lid can be easily detached from the open container main body after the thermal contraction.

  Further, according to the present invention, it is possible to provide a container lid which can be easily desorbed to the open container main body after heat contraction regardless of the degree of thermal contraction of the open container main body.

  Further, according to the present invention, it is possible to provide a method of detaching the container lid which allows the container lid to be easily desorbed from the open container body after the heat contraction regardless of the degree of the thermal contraction of the open container body.

The longitudinal cross-sectional view of the lidded container which concerns on 1st embodiment of this invention is represented. The longitudinal cross-sectional view in the opening container main body which concerns on 1st embodiment of this invention both before heating and after heating is represented. The container lid which concerns on 1st embodiment of this invention represents the longitudinal cross-sectional view of a container with a lid in the state fitted to the opening container main body after heating. The expanded longitudinal cross-sectional view in the engaging part of the lidded container which concerns on 1st embodiment of this invention is represented. The enlarged longitudinal cross-sectional view in the engaging part of a container with a lid | cover in the state which the container lid which concerns on 1st embodiment of this invention fits with the opening container main body after heating is represented. The top view of the lidded container which concerns on 1st embodiment of this invention is represented. The flow figure which shows the desorption method of the container lid concerning a first embodiment of the present invention is expressed. The flowchart which shows the modification of the desorption method of the container lid which concerns on 1st embodiment of this invention is shown. The container lid which concerns on 2nd embodiment of this invention represents the longitudinal cross-sectional view of a container with a lid in the state fitted to the opening container main body after heating. The top view of the lidded container which concerns on 2nd embodiment of this invention is represented. The longitudinal cross-sectional view in before heating of two types of opening container main bodies from which the degree of heat contraction which concerns on 2nd embodiment of this invention differs is represented with two types of longitudinal cross-sectional views after heating. The longitudinal cross-sectional view of the lidded container which concerns on 3rd embodiment of this invention is represented. The top view of the lidded container which concerns on 3rd embodiment of this invention is represented. The enlarged longitudinal cross-sectional view in the engaging part of the lidded container which concerns on 3rd embodiment of this invention is represented. The enlarged container longitudinal cross-sectional view in the engaging part of a container with a lid | cover in the state which the container lid which concerns on 3rd embodiment of this invention fits with the opening container main body after heating is represented. The container lid which concerns on 3rd embodiment of this invention represents the longitudinal cross-sectional view of a container with a lid in the state fitted to the opening container main body after heating. (A) shows the top view of the conventional lidded container, (b) shows the longitudinal cross-sectional view of BB cross section shown in the figure of (a).

  Hereinafter, embodiments of the present invention will be described in detail based on the drawings. With regard to the direction in which the open container bodies 2, 12, 22 are similarly fitted to the container lids 3, 13, 23 with respect to the open container bodies 2, 12, 22 constituting the lidded containers 1, 11, 21, the side to be opened It is called the open side, and the opposite side is called the bottom side. For example, the upper side in FIG. 1 corresponds to the opening side, and the lower side corresponds to the bottom side. With regard to the direction in which the container lids 3, 13, 23 are fitted with the open container main bodies 2, 12, 22, the bottom portions of the open container main bodies 2, 12, 22 when covered with the open container main bodies 2, 12, 22 The opposite side is referred to as the inside and the opposite side is referred to as the outside. For example, the upper side in FIG. 1 corresponds to the outer side, and the lower side corresponds to the inner side.

  1 to 8 illustrate a first embodiment of a lidded container, a container lid and a method of detaching the container lid according to the present invention.

  In FIG. 1, reference numeral 1 denotes a lidded container including an opening container body 2 and a container lid 3 detachably fitted to the opening container body 2. The solid lines in FIG. 1 and FIG. 4 show the open container body 2 and the container lid 3 in the fitted state, and the inner surface of the engagement convex portion 4 and the container lid 3 provided on the open side of the open container body 2 And a first engagement recess 5 provided on the

  The lidded container 1 is used for packaging a food F containing solid, semi-solid, and liquid (not shown). Food F is filled into the lidded container 1 from the opening 6 of the opening container main body 2 in a state where the container lid 3 is removed. Moreover, the container 1 with a lid | cover may be disinfected by superheated steam in the state which removed the container lid | cover 3 in some cases.

  The open container main body 2 is a molded product having a container shape with no lid and bottom and obtained by thermoforming a synthetic resin sheet, and can be opened upward while being placed on a horizontal surface, and can hold the food F inside. So as to have a certain depth. The synthetic resin sheet includes one using a crystalline polymer as a raw material, for example, one containing polypropylene (PP), a PET-based resin, and polylactic acid as a raw material.

  It is known that the synthetic resin sheet which uses these crystalline polymers etc. as a raw material shrinks by heating. For example, in the case of a PET-based resin, it is known that heat contraction is caused by heating at 110 ° C. or more at any ratio of two thousandths to one thousandths of thousand depending on the type of resin.

  That is, the open container main body 2 has a property of contracting by heating. Such heat shrinking is performed when the open container main body 2 is sterilized at a temperature of 140 to 180 ° C. by superheated steam, or when the open container main body 2 is filled with the food F preheated to a high temperature. The case where it cooks at the temperature of 110-230 ° C every opening container main part 2 etc. after filling up food F, etc. is mentioned.

  As a result, as shown in FIG. 2, the open container main body 2 shrinks as a whole from the longitudinal cross section before heating shown by BS to the longitudinal cross section after heating shown by AS 1.

  The container lid 3 has a disk shape having a diameter larger than that of the opening 6 of the opening container main body 2 as shown in FIG. 1 and can cover the opening 6. Further, the container lid 3 is a molded product obtained by thermoforming a synthetic resin sheet, similarly to the open container main body 2.

  The container lid 3 is an open container before filling the food F into the open container main body 2, before heating and sterilizing the open container main body 2 with heated steam, before heating and cooking the food F before cooking together with the open container main body 2, etc. It is removed from the main body 2. And after these filling, heat sterilization, cooking etc., it is attached to the opening container main body 2 again, and the food F in the opening container main body 2 is covered. Therefore, the container lid 3 is not heated like the open container body 2.

  The engagement convex part 4 is provided along the opening edge 6a of the opening container main body 2 as the continuous line of FIG.1 and FIG.4 shows. That is, the engagement convex portion 4 has an annular portion 4a at the tip on the opening side, and an annular projection 4b which is continuous in the radial direction of the annular portion 4a and the opening container main body 2 and protrudes radially outward from the annular portion 4a Have. The annular portion 4a and the annular protrusion 4b form a ring shape having a substantially circular cross section integrally.

  The engagement convex portion 4 is contracted integrally with the open container main body 2 by heating. The diameter D of the engaging convex portion 4 is the diameter Da1 of the engaging convex portion 4 after heating shown by a phantom line with respect to the diameter Db of the engaging convex portion 4 before heating shown by the solid line as shown in FIGS. Shrink to

  The first engagement recess 5 forms an annular shape in plan view as shown in FIG. 6 and is disposed on the inner side surface of the container lid 3 as shown in FIG. Further, as shown in FIGS. 1 and 4, the first engagement recess 5 has a diameter in plan view the same diameter as the diameter Db of the engagement projection 4 before heating, and the opening container body 2 and the container lid In a state of being fitted with 3, a semi-cylindrical portion 5a having a plan view annular shape opened inward so as to cover the annular portion 4a of the engagement convex portion 4 from the opening side. The inner diameter of the cross section of the semi-cylindrical portion 5a is slightly larger than the outer diameter of the cross section of the ring shape formed by the annular portion 4a and the annular projection 4b.

  Further, the first engagement recess 5 has a locking projection 5 b which is continuous with the lower end of the inner wall of the semicylindrical portion 5 a on the radially outer side of the container lid 3. The locking projection 5 b protrudes radially inward of the container lid 3 from the inner wall side.

  When the opening container main body 2 and the container lid 3 are fitted into the first engagement recess 5, the annular portion 4a of the engagement convex portion 4 starts to enter the inside of the semi-cylindrical portion 5a, and the annular portion 4a Subsequently, the annular protrusion 4b enters. Further, when the annular projection 4b of the engagement projection 4 finishes entering, the first engagement recess 5 is engaged by the locking projection 5b engaging the annular projection 4b upward in FIG. Engage with the convex part 4.

  The first engagement recess 5 produces a slight gap between the engagement protrusion 4 when the open container body 2 and the container lid 3 are fitted. When the container lid 3 is removed from the opening container main body 2, the opening end edge 6a of the opening container main body 2 is elastically deformed slightly in the radially inward direction, and the locking of the annular projection 4b by the locking protrusion 5b is released. The engagement between the engagement protrusion 4 and the first engagement recess 5 is released.

  In FIGS. 1 and 3 to 6, reference numeral 7 denotes a second engagement recess provided on the inner side surface of the container lid 3.

  The second engagement recess 7 forms an annular shape in a plan view as shown in FIG. 6, and the diameter in plan view is smaller than that of the first engagement recess 5, and as shown in FIGS. On the inner surface of the container lid 3 and closer to the center C of the inner surface. And the diameter in planar view of the 2nd engagement recessed part 7 is set to the diameter same as diameter Da1 of the engagement convex part 4 after a heating, as shown in FIG.3 and FIG.5.

  That is, as shown in FIG. 2 for the open container main body 2, the thermal contraction margin of the engagement convex portion 4 changes according to the size of the contraction width when thermally shrinking from the longitudinal cross section BS before heating to the longitudinal cross section AS1 after heating. On the other hand, as a result of matching the dimensional difference between the first engagement recess 5 and the second engagement recess 7 to this thermal contraction margin, the diameter of the second engagement recess 7 corresponds to that of the engagement protrusion 4 after heating. It becomes equal to the diameter Da1.

  The first engagement recess 5 and the second engagement recess 7 are formed concentrically around the center C of the inner surface of the container lid 3. Further, the first engagement recess 5 and the second engagement recess 7 are both disposed on the inner side surface of the container lid 3 so as to be on the same plane. Then, the container lid 3 has a circular flat portion whose inner periphery in the radial direction of the second engagement recess 7 is a boundary with the second engagement recess 7.

  As described above, the second engagement recess 7 has the same diameter as the diameter Da1 of the engagement protrusion 4 after heating in plan view, and also engages with the first engagement recess 5. It is formed in the substantially similar shape which has the same dimensional difference as the said thermal contraction margin of the convex part 4. That is, in the fitting state between the open container main body 2 and the container lid 3 after heat contraction as shown by the solid lines in FIGS. 3 and 5, the second engagement recess 7 is the annular portion 4 a of the engagement protrusion 4. It has a semi-cylindrical portion 7a in a plan view annular shape opened inward so as to cover from the opening side. The inner diameter of the cross section of the semi-cylindrical portion 7a is slightly larger than the outer diameter of the cross section of the ring shape formed by the annular portion 4a and the annular projection 4b.

  Further, the second engagement recess 7 has a locking projection 7 b which is continuous with the lower end of the inner wall of the semi-cylindrical portion 7 a on the radially outer side of the container lid 3. The locking projection 7 b protrudes radially inward of the container lid 3 from the inner wall side.

  When the open container body 2 after heat contraction and the container lid 3 are fitted into the second engagement recess 7, the annular portion 4 a of the engagement protrusion 4 starts to enter the inside of the semi-cylindrical portion 7 a, Following the annular portion 4a, the annular projection 4b enters. Further, when the annular projection 4b of the engagement projection 4 finishes entering, the second engagement recess 7 is engaged by the locking projection 7b engaging the annular projection 4b upward in FIG. Engage with the convex part 4.

  The second engagement recess 7 produces a slight gap between the engagement projection 4 in the fitted state of the open container body 2 and the container lid 3 after heat contraction. When the container lid 3 is removed from the opening container main body 2, the opening end edge 6a of the opening container main body 2 is elastically deformed slightly in the radially inward direction, and the locking of the annular protrusion 4b by the locking protrusion 7b is released. The engagement between the engagement protrusion 4 and the second engagement recess 7 is released.

  Thus, by providing the container lid 3 with the two engagement recesses consisting of the first engagement recess 5 before heat contraction and the second engagement recess 7 after heat contraction, It is easy to detach the opening container main body 2 and the container lid 3 before and after heat contraction without causing the container lid 3 to be pulled out and the fitting between the engaging portions 4, 5 and 7 becoming tight. It can be carried out.

  In addition, the dimensional difference between the first engagement recess 5 before heat contraction and the second engagement recess 7 after heat contraction is set in accordance with the heat contraction margin of the engagement protrusion 4. Therefore, even when the degree of thermal contraction of the open container main body 2 is large, the desorption between the open container main body 2 and the container lid 3 is easy.

  Furthermore, since the second engagement recess 7 is smaller in diameter than the first engagement recess 5 and is disposed closer to the center C of the inner surface of the container lid 3, It can be arranged compactly. That is, the container lid 3 does not have to be largely designed because the second engagement recess 7 is provided in addition to the first engagement recess 5.

  Although FIG. 6 shows the lidded container 1 whose shape in plan view is circular, the shape of the lidded container 1 in plan view may be a shape other than a circle such as a square, an ellipse, or a polygon.

  Moreover, although the planar view shape shows 1st engagement recessed part 5 and 2nd engagement recessed part 7 with circular shape in FIG. 6, when the container 1 with a lid | cover is square other than circular etc. Each engaging recess 5, 7 may also be square or the like. Furthermore, when the open container main body 2 is square or the like and the container lid 3 is circular, the engagement convex portion 4 may be square or the like, and each of the engagement recesses 5 and 7 may be square or the like. . Alternatively, the reverse combination of these may be used.

  The material of the container lid 3 may be a material other than the synthetic resin such as paper, wood, glass, etc. besides the above-described synthetic resin sheet. In addition to the molded product obtained by thermoforming, the container lid 3 may be obtained by casting, lamination, cutting, cutting, compression molding or the like.

  In FIG. 7, RS exemplifies the method of detaching the container lid in the first embodiment of the present invention.

  The lidded container 1 before performing the container lid detaching method RS is, for example, a state in which the container lid 3 is detachably fitted to the open container main body 2 in a state where the heatable food F is filled in the open container main body 2 It is placed in The food F at this time is normal temperature.

  Also, the lidded container 1 may be placed in a state where nothing is filled in the open container main body 2 in order to sterilize the inside with superheated steam, for example.

  And in container 1 with lids before performing attachment or detachment method RS of a container lid, engagement convex part 4 and the 1st engagement crevice 5 are in an engaged state.

  The container lid detachment method RS is a container lid for detaching the container lid 3 fitted with the opening container body 2 as described above with respect to the opening container body 2 which is thermoformed from a synthetic resin sheet and contracts due to heating. Desorption method.

  Then, as shown in FIG. 7, the method for attaching and detaching the container lid first releases the engagement between the engaging convex portion 4 and the first engaging recess 5 and removes the container lid 3 from the open container main body 2. Process RS1 is included. The user pulls, for example, the opening container body 2 and the container lid 3 toward the bottom and the outside with fingers, respectively, to release the engagement between the engagement convex portion 4 and the first engagement concave portion 5 .

  Users such as consumers and businesses can use the open container body 2 filled with the food F immediately after being purchased and carried in from a convenience store, a supermarket, a supplier, a factory, etc. The container lid 3 is removed from the container 3 by the step RS1 so that the container lid 3 can be heated by a heating device such as a microwave oven, an oven, or a baking line.

  Next, the removal method RS of the container lid includes a process RS2a of heating the opening container body 2 after removing the container lid 3 from the opening container body 2. After removing the container lid 3 from the container body 2, the user, such as a consumer or business person, may open the container body 2 filled with food F such as sugar beet, noodles, confectionery or the like in a microwave oven or oven The food F is cooked by heating with a heating apparatus such as a baking line. In addition, after removing the container lid 3 from the opening container main body 2, a user such as a business person exposes the opening container main body 2 in a state where nothing is filled to superheated steam and the like, and the opening container main body 2 is heated by heat. Sterilize.

  The open container main body 2 is heated by the cooking of the food F and the sterilization with superheated steam. At this time, the temperature of the open container main body 2 is raised to 110 ° C. or more, and when the raw material is a PET resin, thermal contraction occurs at any ratio of 2/1000 to 1/18 in volume ratio. That is, the opening container main body 2 is thermally shrunk by the process RS2a of heating the opening container main body 2, and the diameter D of the engagement convex part 4 is reduced from Db to Da1.

  When cooking gratin or baked confectionery among the above-mentioned sugar beets and confectionery, it is known to raise the temperature to 150 ° C. or 230 ° C., respectively.

  On the other hand, since the container lid 3 has already been removed from the open container main body 2, it is not heated in the process RS2a of heating the open container main body 2. That is, the container lid 3 does not cause thermal contraction.

  As a result, while the diameter of the engagement convex portion 4 is reduced due to heat contraction, the shape of the first engagement concave portion 5 does not change, which results in different diameters, and the engagement convex portion 4 and the first engagement The mating recess 5 becomes difficult to engage as before heating.

  Finally, the method for attaching and detaching the container lid includes a step RS3 of covering the opening container main body 2 with the container lid 3 and engaging the engagement convex portion 4 with the second engagement concave portion 7. Users, such as consumers, do not eat food F such as vegetables and noodles cooked by microwave oven immediately, for example, for a certain period of time for storage, transportation, additional cooking due to steam or time lapse, etc. I have to eat after eating. Moreover, users, such as a business person, distribute | circulate, for example, in the state which packaged foods F, such as sugar beet and confectionery, cooked by oven, baking line etc., for example.

  At this time, in order to steam food F and not spill food F, the open container main body 2 filled with food F is covered again with the container lid 3 so as not to mix foreign substances into the food F.

  Furthermore, even when the open container main body 2 is sterilized and disinfected, a user such as a business person covers the open container main body 2 with the container lid 3 again in order to keep the inside of the open container main body 2 sterile or sterile.

  By the way, the container lid 3 is provided in advance with the second engagement recess 7. The diameter of the second engagement recess 7 is smaller with respect to the diameter Db of the first engagement recess 5 according to the thermal contraction of the engagement convex 4, and the engagement convex after the thermal contraction as shown in FIG. It corresponds to the diameter Da1 of the part 4. That is, the user superimposes the heat-shrinkable engagement convex portion 4 and the second engagement concave portion 7 and then uses the opening container main body 2 and the container lid 3 with their fingers to open the inner side and the inner side, respectively. It is possible to easily engage the engagement projection and the second engagement recess 7 by pressing each other towards each other.

  As described above, since the container lid 3 is provided in advance with the second engagement recess 7 corresponding to the thermal contraction of the engaging convex portion 4, the degree of thermal contraction is determined depending on the container lid detachment method RS of the present invention. Regardless of the size of the container lid 3, the container lid 3 can be easily desorbed from either the open container main body 2 before heat contraction or the open container main body 2 after heat contraction.

  RS ‘in FIG. 8 is a modified example of the container lid detachment method RS described above, and illustrates a different container lid detachment method in the first embodiment of the present invention.

  The lid-opened container 1 is not filled with anything in the container-with-lid 1 before the container lid is removed.

  The container lid detaching method RS ‘includes a step RS1 of first releasing the engaged state between the engagement convex portion 4 and the first engagement recess 5 and removing the container lid 3 from the open container main body 2. The user pulls, for example, the opening container body 2 and the container lid 3 toward the bottom and the outside with fingers, respectively, to release the engagement between the engagement convex portion 4 and the first engagement concave portion 5 .

  A user such as a consumer or a business person can fill contents such as food F by step RS1 of removing the container lid 3 from the open container body 2 of the prepared open container body 2 of the lidded container 1 It will be in the state.

  Next, the method for removing the container lid RS includes a step RS2b of filling the open container body 2 with the food F in a high temperature state after removing the container lid 3 from the opening container body 2. After removing the container lid 3 from the opening container main body 2, users such as consumers and businesses fill the opening container main body 2 with food F such as vegetables and noodles heated to 110 ° C. or higher, for example.

  By filling the food F in such a high temperature state, the open container body 2 is heated. Thereby, the open container main body 2 is thermally shrunk, and the diameter D of the engagement convex portion 4 is reduced from Db to Da1.

  On the other hand, since the container lid 3 has already been removed from the open container main body 2, it is not heated in the process RS2b of filling the open container main body 2 with the food F in a high temperature state. That is, the container lid 3 does not cause thermal contraction.

  As a result, while the diameter of the engagement convex portion 4 is reduced due to heat contraction, the shape of the first engagement concave portion 5 does not change, which results in different diameters, and the engagement convex portion 4 and the first engagement The mating recess 5 becomes difficult to engage as before heating.

  Finally, the method for attaching and detaching the container lid RS includes the step RS3 of covering the opening container main body 2 with the container lid 3 and engaging the engagement convex portion 4 with the second engagement concave portion 7. Consumers, business users, etc. do not eat the high-temperature food F filled in the opening container main body 2 immediately, but for a certain time for storage, movement, additional cooking due to steam or time lapse, etc. They are eaten and eaten, and may be distributed in the packaged state.

  At this time, in order not to spill the food F or to mix the foreign matter into the food F, the open container body 2 filled with the food F is covered with the container lid 3 again.

  By the way, the container lid 3 is provided in advance with the second engagement recess 7. The diameter of the second engagement recess 7 is smaller with respect to the diameter Db of the first engagement recess 5 according to the thermal contraction of the engagement convex 4, and the engagement convex after the thermal contraction as shown in FIG. It corresponds to the diameter Da1 of the part 4. That is, the user superimposes the heat-shrinkable engagement convex portion 4 and the second engagement concave portion 7 and then uses the opening container main body 2 and the container lid 3 with their fingers to open the inner side and the inner side, respectively. It is possible to easily engage the engagement projection and the second engagement recess 7 by pressing each other towards each other.

  As described above, the container lid 3 is provided in advance with the second engagement recess 7 corresponding to the thermal contraction of the engaging convex portion 4, so that the thermal contraction of the container lid 3 can also be achieved by the container lid detachment method RS 'of the present invention. Regardless of the magnitude of the degree, the container lid 3 can be easily desorbed from any of the open container main body 2 before heat contraction and the open container main body 2 after heat contraction.

  In the present embodiment, as an example of heating the food F, the heating is exemplified. However, the purpose of heating the food F is an object other than heating such as reheating of the food F or high temperature sterilization. It is also good.

  Moreover, although the food F was mentioned as an example as a content with which the opening container main body 2 is filled, this content may be contents other than the food F like a chemical | medical solution, cosmetics, and a chemical.

  In addition to heating of the contents such as the food F, the example of sterilizing by superheated steam was given for the purpose of removing the container lid 3 from the opening container main body 2, but the purpose of removing the container lid 3 is that of the opening container main body 2 It may be for purposes other than sterilization such as surface treatment, molding, and application.

  FIGS. 9-11 illustrate a second embodiment of the lidded container, container lid and method of detaching the container lid according to the present invention.

  Reference numeral 11 shown in FIG. 9 is a container with a lid provided with an opening container body 12 and a container lid 13 detachably fitted to the opening container body 12. Further, along the opening edge 16 a of the open container main body 12, the engagement convex portion 14 and the respective engagement concave portions 15, 17 and 19 provided on the inner side surface of the container lid 13 are shown.

  Although the container 11 with a lid has a circular shape in plan view in FIG. 10, it may have a shape other than a circle such as a square, an oval, or a polygon in plan view.

  The open container main body 12 is a non-lid, bottomed molded product obtained by thermoforming a synthetic resin sheet, and has a property of shrinking by heating. When this synthetic resin sheet is a PET-based resin, it is known that heat contraction occurs at a ratio of 2/1000 to 18/000 depending on the type of resin when heated at 110 ° C. or higher.

  The container lid 13 has a disk shape having a diameter larger than that of the opening 16 of the opening container body 12 and can cover the opening 16. The container lid 13 according to the present embodiment has a third engagement surface closer to the center 6 of the inner side than the second engagement recess 17 in addition to the first engagement recess 15 and the second engagement recess 17 on the inner surface. It differs from the container lid 3 in the first embodiment in that the engagement recess 19 is provided. The other configuration is the same as that of the first embodiment. Further, the structures of the engagement convex portion 14 and the engagement concave portions 15, 17 and 19 are the same as the structures of the engagement convex portion 4 and the engagement concave portions 5 and 7 in the first embodiment.

  The diameter of the third engagement recess 19 is equal to the diameter Da2 when the open container body 12 shrinks to the longitudinal cross section shown by AS2 after heating as shown in FIG. FIG. 9 shows a vertical cross section BS of the open container main body 12 before contraction, while the imaginary line shows a state in which the engagement convex portion 14 before contraction and the first engagement concave portion 15 are engaged. Similarly, a solid line shows a state where the engagement convex portion 14 after contraction and the third engagement concave portion 19 are engaged when the open container main body 12 contracts to the vertical cross section AS2.

  That is, in the case where the type of resin of the open container main body 12 shrinks to the longitudinal cross section shown by AS1 after heating, the engaging convex portion 14 shrinks to a diameter Da1, while on the other hand, AS2 after heating In the case of the type of resin that shrinks to the longitudinal cross-section, it shrinks to a diameter Da2. The container lid 13 has a second engagement recess 15 capable of engaging with the opening container main body 12 in which the engagement convex portion 4 contracts to the diameter Da1, and an opening in which the engagement convex portion 4 contracts to the diameter Da2 Both the container body 12 and the third engagement recess 17 engageable are provided.

  Therefore, according to the present embodiment, one type of container lid 13 can be detachably fitted with two types of open container main bodies 12 and 12 different in the type of resin and the like depending on the degree of thermal contraction. In addition, the shapes of the second and third engagement concave portions 15 and 17 corresponding to the thermal contraction margin of each engagement convex portion 14 may be set in advance in accordance with the thermal contraction rate specific to each resin. Since it is possible, even when the degree of thermal contraction of the open container main body 12 is large, the desorption between the open container main body 12 and the container lid 13 is easy.

  In addition, by similarly providing the fourth and subsequent engagement recesses in one type of container lid, it can be easily detachably fitted with three or more types of open container main bodies that differ in the type of resin and the like depending on the degree of heat shrinkage. You can also.

  12-16 illustrate a third embodiment of the lidded container, container lid and method of detaching the container lid according to the present invention.

  Reference numeral 21 in FIG. 12 denotes a container with a lid provided with an open container main body 22 thermoformed from a synthetic resin sheet and contracted by heating and a container lid 23 detachably fitted to the open container main body 22.

  The lidded container 21 has a circular shape in plan view as shown in FIG. 13 and has a rotationally symmetrical shape with the center line Ca as the axis of rotation. Further, the open container main body 22 and the container lid 23 are also circular in plan shape and rotationally symmetrical with the center line Cb and the center line Cc, which respectively coincide with the center line Ca, as rotation axes.

  The open container main body 22 is a molded article having a container shape with no lid and bottom, and a hook-like engagement convex portion 24 extending radially outward from the open end edge 26 a along the open end edge 26 a in a plan view circular shape. Is provided.

  Moreover, the opening container main body 22 has the property to be thermally shrunk by heating similarly to the opening container main body 2 in 1st embodiment and the opening container main body 12 in 2nd embodiment.

  The container lid 23 is externally fitted to the opening container main body 22 from the opening side of the opening container main body 22, and as shown in FIGS. 12 and 14, the inner side surfaces 23a, b, f are open container main body 22 at the time of fitting. The inner inclined surfaces 23a and 23b are inclined so as to approach the central portion C intersecting with the center line Cc as being away from the bottom 22a side of the.

  Concave first and second engaging recesses 25 and 27 are disposed on the inner inclined surfaces 23a and 23b so as to draw a circle around the center line Cc and open radially inward. And are provided.

  The engagement convex portion 24 has a flange portion 24 a that protrudes radially outward as shown in FIG. 14. The bottom surface 25a of the first engagement recess 25 has substantially the same diameter as the diameter Db of the tip of the flange portion 24a in plan view.

  The first engagement recess 25 is continuous with the bottom surface 25a, the bottom surface 25a, and the front end edge 23c of the container lid 23, and is inclined to face the opposite side of the front end edge 23c with respect to the bottom surface 25a. It has a wall 25b. Therefore, the flange portion 24a locks the first locking wall 25b downward in FIG. 14 even when a force to pull the container lid 23 upward in FIG. 14 is applied in the fitted state with the open container main body 22. The fitted state of the open container body 22 and the container lid 23 is maintained.

  The first engagement recess 25 has a bottom surface 25a and a first stop wall 25c which is continuous with the tip edge 23c opposite to the tip edge 23c and is inclined to face the tip edge 23c with respect to the bottom surface 25a. Therefore, even when a force for pushing the container lid 23 downward in FIG. 14 is applied in the fitted state with the opening container main body 22, the flange portion 24a opens the first control wall 25c to restrain the first restriction wall 25c upward in FIG. The container body 22 is not fitted to the back side of the container lid 23 any more.

  On the other hand, FIG.15 and FIG.16 shows the state which the opening container main body 22 thermally shrank. The bottom surface 27a of the second engagement recess 27 shown in FIG. 15 has substantially the same diameter as the diameter Da of the tip of the flange portion 24a after the opening container main body 22 is thermally shrunk in plan view.

  The second engagement recess 27 is continuous with the bottom surface 27a, the bottom surface 27a, and the tip end 23c of the container lid 23, and is inclined so as to face the tip end 23c opposite to the bottom surface 27a. It has a wall 27b. Therefore, the flange portion 24a locks the second locking wall 27b downward in FIG. 15 even when a force to pull the container lid 23 upward in FIG. 15 is applied in the fitted state with the open container main body 22. The fitted state of the open container body 22 and the container lid 23 is maintained.

  The second engagement recess 27 has a bottom surface 27a, and a second stop wall 27c which is continuous with the tip edge 23c and opposite to the tip edge 23c. Therefore, even when a force for pushing the container lid 23 downward in FIG. 15 is applied in the fitted state with the open container main body 22, the engagement convex portion 24 has the second restraint wall 27c facing upward in FIG. Therefore, the open container body 22 will not be fitted to the back side of the container lid 23 any more.

  The flange portion 24a before thermal contraction enters the inside of the container lid 23 from the opening on the tip edge 23c side when the opening container body 22 and the container lid 23 fit, and the tip edge 23c as shown in FIG. While spreading the continuous inner inclined surface 23b in the radial outward direction, it approaches the minimum diameter portion 23d continuous to the inner inclined surface 23b. At this time, the open container main body 22 and the container lid 23 are elastically deformed in the radially inward direction and the radially outward direction, respectively, and the flange portion 24 a similarly passes over the minimum diameter portion 23 d and reaches the first engagement recess 25.

  Further, when the container lid 23 is removed from the open container main body 22, the flange portion 24a before heat contraction is a minimum diameter portion continuous with the first locking wall 25b while spreading the first locking wall 25b radially outward. Close to 23d. Also at this time, the opening container main body 22 and the container lid 23 are elastically deformed in the radial inner direction and the radial outer direction, respectively, and the flange portion 24a similarly climbs over the minimum diameter portion 23d to the tip edge 23c side of the container lid 23 Through.

  The flange portion 24a after heat contraction enters the inside of the container lid 23 from the opening on the tip end 23c side when the opening container body 22 and the container lid 23 are fitted, and the first engagement recess shown in FIG. After passing through 25, while approaching and spreading the first restraint wall 25c in the radial outward direction, it approaches the minimum diameter portion 23e continuous with the first restraint wall 25c. At this time, the open container main body 22 and the container lid 23 are elastically deformed in the radially inward direction and the radially outward direction, respectively, and the flange portion 24 a similarly passes over the minimum diameter portion 23 e and reaches the second engagement recess 27.

  Further, the flange portion 24a after heat contraction is a minimum diameter portion continuous with the second locking wall 27b while spreading the second locking wall 27b radially outward when the container lid 23 is removed from the opening container main body 22 Approach 23e. Also at this time, the opening container main body 22 and the container lid 23 are elastically deformed in the radially inner direction and the radially outer direction, respectively, and the flange portion 24a similarly passes over the minimum diameter portion 23e and is on the tip edge 23c side of the container lid 23 Through.

  The configuration other than that described above is common to the first embodiment and the second embodiment.

  As described above, in the lidded container 21, the diameter of the first engagement recess 25 is the diameter Db of the engagement protrusion 24 before thermal contraction, while the second engagement recess 25 is the second in addition to the first engagement recess 25. And the diameter of the second engagement recess 27 is matched to the diameter Da of the engagement protrusion 24 after thermal contraction.

  That is, when designing the lidded container 21, the heat shrinkage margin (Db−Da) of the diameter of the engagement convex portion 24 changes according to the magnitude of the shrinkage width when heat shrinking by heating the open container main body 22. The difference in diameter between the engagement recess 25 and the second engagement recess 27 is matched to the heat shrinkage margin. Therefore, regardless of the degree of thermal contraction of the open container main body 22, the container 51 with lid has the state before thermal contraction shown in FIGS. 12 and 14 and the state after thermal contraction shown in FIGS. In both cases, desorption of the open container body 22 and the container lid 23 is easy.

  Further, each of the engagement concave portions 25 and 27 is compactly disposed in the inner side surfaces 23a, b and f in the radial direction of the container lid 23 in order to form a concentric circle centered on the central portion C in plan view.

  Furthermore, by providing the first engagement recess 25 and the second engagement recess 27 on the inner inclined surfaces 23a and 23b, the engagement recesses 25 and 27 are combined in a three-dimensional manner. That is, as shown in FIG. 12 and FIG. 16, even when the thermal contraction margin (Db−Da) of the diameter of the engagement convex portion 24 is small and the difference in diameter between the engagement concave portions 25 and 27 has to be small. The first engaging recess 25 is provided on the lower side in FIGS. 12, 14, 15 and 16, and the second engaging recess 27 is also provided on the upper side, so that both the engaging recesses 25 and 27 are inclined inward. It can be easily arranged on the surfaces 23a, b.

  Moreover, since the flange portion 24 a is formed on the engagement convex portion 24, the engagement convex portion 24 can be engaged with the engagement concave portions 25 and 27 in the thickness direction of the center line Cb of the flange portion 24 a. Good. That is, the first engagement recess 25 on the lower side and the second engagement recess 27 on the upper side have bottom surfaces 25a and 27a having lengths equal to the plate thickness in the center line Cc direction. You just have to.

  Therefore, the respective engaging recesses 25 and 27 can be disposed close to each other in the inner inclined surfaces 23a and 23b in the direction of the center line Cc.

  Although FIG. 13 shows a lidded container 21 whose plan shape is a circle, the lidd container 21 may have a shape other than a circle such as a square, an ellipse, or a polygon. 12, 14, 15, 16, the second engaging recess 27 is provided on the inner inclined surfaces 23a and 23b of the container lid 23, but is provided on the inner flat surface 23f at the top of the container lid 23. May be Furthermore, although the container lid 23 is provided with two engagement recesses 25 and 27 in order from the lower side, the third engagement recess and the fourth and subsequent ones are located on the upper side with respect to the second engagement recess 27. An engagement recess may be provided.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, in any of the embodiments, the contents filled in the open container main body 2, 12, 22 do not have to be the food F, and may be solid, semi-solid, liquid, etc. other than the food F.

  Moreover, fitting or removal of the opening container main body 2, 12, 22 and the container lid 3, 13, 23 need not be performed by fingers, but may be performed by tools other than fingers, semi-automatic machines, automatic machines, etc. .

1, 11, 21 container with lid 2, 12, 22 opening container main body 3, 13, 23 container lid 4, 14, 24 engagement convex portion 24a flange portion 5, 15, 25 first engagement concave portion 25b first Locking wall 25c First stop wall 6, 16, 26 Opening 7, 17, 27 Second engagement recess 27b Second stop wall 27c Second stop wall 19 Third engagement recess

Claims (7)

An open container main body which is thermoformed from a synthetic resin sheet and shrinks by heating;
A lidded container comprising a container lid detachably fitted to the open container body,
In the fitted state, an engagement convex portion provided along the opening edge of the open container main body engages with a first engagement recess provided on the inner side surface of the container lid,
The inner side surface is provided with a second engagement recess on the center side of the inner side than the first engagement recess,
The second engagement recess is formed to be substantially similar to the first engagement recess in the same dimension difference as the heat shrinkage margin of the engagement protrusion in the open container main body. A container with a lid. The container lid is externally fitted to the open container body, and the inner side surface has an inclined surface which is inclined so as to approach the center as being away from the bottom side of the open container body in the fitting direction.
The lidded container according to claim 1, wherein each of the engagement recesses is provided on the inclined surface so as to surround a center line passing through the center in the fitting direction. The lid container according to claim 2, wherein the engagement convex portion forms a flange portion which protrudes outward with respect to the center line from an opening edge of the open container main body. A container lid that can be detachably fitted to an open container main body that is thermoformed from a synthetic resin sheet and shrunk due to heating,
The inner side has a first engagement recess engaged with an engagement projection provided along the opening edge of the opening container body,
The inner side surface is provided with a second engagement recess on the center side of the inner side than the first engagement recess,
The second engagement recess is formed to be substantially similar to the first engagement recess in the same dimension difference as the heat shrinkage margin of the engagement protrusion in the open container main body. To be a container lid. Outer fitting to the open container body,
The inner side surface has an inclined surface which is inclined so as to approach the center as it is separated from the bottom side of the open container main body in the fitting direction with the open container main body,
The container lid according to claim 4, wherein each of the engagement recesses is provided on the inclined surface so as to surround a center line passing through the center in the fitting direction. A method of detaching a container lid for detaching a container lid fitted to the open container main body with respect to the open container main body which is thermoformed from a synthetic resin sheet and shrunk due to heating,
The engagement convex portion provided along the opening edge of the open container body and the first engagement recess provided on the inner side surface of the container lid are released from the open container body Removing the container lid;
Heating the open container body after removing the container lid;
After the heating step, the open container main body is covered with the container lid, and the engagement convex portion is provided on the inner side surface on the center side than the first engagement concave portion, and And D. engaging the second engagement recess formed in a substantially similar shape having the same dimensional difference as the heat shrinkage margin of the engagement projection. A method of detaching a container lid for detaching a container lid fitted to the open container main body with respect to the open container main body which is thermoformed from a synthetic resin sheet and shrunk due to heating,
The engagement convex portion provided along the opening edge of the open container body and the first engagement recess provided on the inner side surface of the container lid are released from the open container body Removing the container lid;
Filling the food in a high temperature state into the open container body after removing the container lid;
After the step of filling the food, the open container body is covered with the container lid, and the engagement convex portion is provided on the inner side surface on the center side of the first engagement concave portion, and And a step of engaging the second engagement recess formed in a substantially similar shape having the same dimensional difference as the heat shrinkage margin of the engagement projection.

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