JP2019018920A - Lid body - Google Patents

Abstract

To provide a lid body in which tear of a sheet of a beverage container can be reduced, even when an outer peripheral wall of a base part is folded due to collision.SOLUTION: A lid body 1 comprises: a mirror part 2 extended to a center area; a ring-shaped base part 3 which is swollen with a peripheral edge of the mirror part 2 as a base end; and a fitting part 4 provided on an outermost peripheral part of the lid body 1. The fitting part 4 is configured so that, large protrusions 43 and small protrusions 44 which are swollen to inside are arranged alternately in one row along a peripheral direction of an inner peripheral face. The large protrusion 43 has a swollen amount relatively larger than that of the small protrusion 44, the small protrusion 44 has a swollen amount relatively smaller than that of the large protrusion 43. When a flange gets over the large protrusions 43 and small protrusions 44, and is stored in the fitting part 4, the lid body is integrated with the beverage container.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lid that covers a beverage container sealed with a sheet of aluminum or the like.

  Beverage containers are often sold with lids for various reasons. For example, if the content is coffee, the coffee in the beverage container is also called chilled cup coffee. For example, the lid body is put on a beverage container in order to increase the willingness to purchase from the appearance. Further, for example, in the beverage container, the beverage is sealed by heat-sealing the aluminum sheet on the opening surface, but foreign matter such as dust sticking from the outside or dust adheres to the aluminum sheet. In order to prevent this, a lid is put on. Further, for example, in order to suppress swinging of the inserted straw, the lid body is covered with the insertion hole into which the straw is inserted. The lid can also be a coaster that prevents water drops from falling on the desk.

  Such a lid is provided with a key portion that is a flat region in the center, and is expanded in the periphery of the key portion to form a ring shape in a top view, and a substantially trapezoidal shape in a cross section that cuts the ring. A stand is provided (see, for example, Patent Document 1). The base portion bulges to enhance the design of the lid or to support the beverage container from the surroundings when the lid is used as a coaster.

  This base is typically defined by an inner peripheral wall that rises from the edge of the heel portion, a top surface that is bent from the upper end of the inner peripheral wall and extends parallel to the heel portion, and an outer peripheral wall that hangs down from the outer periphery of the top surface. Has been.

JP 2008-239244 A

  In the state where the lid provided with the base is put on the beverage container, when an offset collision occurs in which an excessive load is applied to one point on the corner of the base, the outer peripheral wall of the base is bent and sharpened, and the beverage container There is a risk of breaking through the aluminum sheet. Even if the breakage does not occur, the broken tip may apply a strong pressure to the aluminum sheet, and the aluminum sheet may crack along the inner edge of the flange.

  When the aluminum sheet is pierced or the aluminum sheet is cracked, the beverage sealed in the beverage container is released and scattered outside. For example, if a beverage container is dropped from a display shelf and the outer peripheral wall is bent due to a collision with the ground, the floor becomes dirty. Also, for example, if a beverage container is contained in a bag with a fine crack in the aluminum sheet, the bag may become dirty due to vibration during transportation, temperature expansion, etc. Occurred.

  In order to solve the above problem, a method of increasing the piercing strength of the aluminum sheet is also conceivable. However, it is planned to pierce the aluminum sheet with a notch-shaped straw tip, and it has been difficult to solve conflicting problems from the viewpoint of improving the strength of the aluminum sheet.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and the purpose thereof is to cause an offset collision in which an excessive load is applied to one point of the corner of the base, and the outer periphery of the base An object of the present invention is to provide a lid that is treated so that the sheet sealing the beverage container is not easily torn even if the wall is broken.

  In order to achieve the above object, the lid of the present invention is a lid that covers a beverage container whose opening is sealed with a sheet from above the sheet and into which a flange of the beverage container is fitted. , A cradle part extending in the center region of the lid, a ring-shaped base part that bulges out from the peripheral edge of the cradle, and a fitting that is located on the outermost periphery of the lid and engages with the flange And the fitting portion includes large protrusions and small protrusions that bulge inward alternately in a line along the circumferential direction of the inner peripheral surface, and the large protrusions bulge more than the small protrusions. The amount is relatively large, the small protrusion has a relatively small bulge amount than the large protrusion, and the flange passes over the large protrusion and the small protrusion and is accommodated in the fitting portion. It combines with the said container for drinks, It is characterized by the above-mentioned.

  The side opposite to the large protrusion from the center of the lid may be the small protrusion, and the opposite side of the small protrusion from the center of the lid may be the large protrusion.

  The fitting portion includes a fitting pocket portion that accommodates the flange upward from the row of the large protrusion and the small protrusion, and the fitting pocket portion, when the flange is fitted into the fitting portion, The thickness of the flange may be larger than that of the flange and may have a play with respect to the thickness of the flange.

  The pedestal is defined by an inner peripheral wall that rises from the back surface, a top surface that is bent from the upper end of the inner peripheral wall and extends parallel to the back surface, and an outer peripheral wall that hangs down from the outer periphery of the top surface. The inner peripheral wall may be thicker than the outer peripheral wall.

  According to the present invention, when receiving an impact large enough to cause the outer peripheral wall of the pedestal to bend, the lid body is easily detached from the beverage container, and the impact can be received by the entire pedestal. Is dispersed in addition to the middle folding, it is possible to suppress the middle folding from progressing to the sheet.

It is a perspective view which shows the state which covered the cover body on the container for drinks. It is a perspective view of a lid. It is sectional drawing of a cover body. It is a bottom view of a lid. It is sectional drawing which shows the dimensional relationship of the various places of a cover body. The molding process of the lid is shown, (a) shows a state where the male mold hits a portion corresponding to the top surface part, and (b) shows a state where the male mold hits the step part. It is a schematic diagram which shows one time immediately after the container for drinks collides with the ground from a cover body. It is a schematic diagram which shows another one time immediately after a container for drinks collides with the ground from a cover body. It is a schematic diagram which shows another one time immediately after the container for drinks collides with the ground from a cover body. It is a mimetic diagram showing one time after a beverage container collides with the ground from a lid in the state where a beverage container and a lid were sleeping. It is a perspective view of a lid after a beverage container collides with the ground from a lid in the state where a container for a drink and a lid were sleeping.

  A lid according to an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the thickness, dimension, positional relationship, ratio, and the like are emphasized for easy understanding. In addition, hereinafter, even if the relationship between the container and the lid is turned over, the direction of the container from the lid is referred to as the lower side or the lower side, and the direction away from the container is referred to as the upper side or the upper side.

(1. Configuration)
FIG. 1 is a perspective view showing the lid 1 in use. As shown in FIG. 1, the lid 1 is placed on a beverage container 100. Beverage container 100 is also called chilled cup coffee if the contents are coffee, and has a cylindrical cup shape with a diameter that is temporarily expanded toward the size cylinder or mouth edge and an upper surface that is open. An aluminum sheet 101 is heat-sealed to the opening surface of the beverage container 100 to seal a beverage such as coffee. The lid 1 covers the beverage container 100 from above the aluminum sheet 101, thereby preventing foreign matters such as dust from adhering to the aluminum sheet 101.

  In the lid 1, a C-shaped or U-shaped straw insertion port 21 is cut into the cradle portion 2. The straw penetrates the lid body 1 through the straw insertion port 21, breaks through the aluminum sheet 101, and is inserted into the inside. The lid 1 fixes the straw insertion port 21 and suppresses the swing of the straw. Furthermore, the container 2 can be overlapped at the time of display by selling the merchandise portion 2 by matching the bottom diameter of the beverage container 100 and raising the periphery of the crab portion 2 to form the ring-shaped base portion 3. it can. The lid 1 can also be a coaster that prevents water droplets from falling on the desk.

  A detailed configuration of the lid 1 will be described. FIG. 2 is a perspective view of the lid body 1, and FIG. 3 is a cross-sectional view showing a radially outer side than a vertical axis passing through the center of the lid body 1. FIG. 4 is a bottom view of the lid. As shown in FIGS. 2 to 4, the lid body 1 has a circular shape in a top view according to the upper outer shape of the beverage container 100. The circular center region of the lid body 1 is a circular key portion 2 and occupies most of the lid body 1. The scissors 2 are flat surfaces facing the aluminum sheet 101 and mainly have a covering function for the aluminum sheet 101.

  In order to enhance the design of the lid 1 or to support the beverage container 100 as a coaster, a base portion 3 is formed on the outside of the kagami portion 2. The base part 3 has a ring shape surrounding the key part 2 in a top view, and bulges upward with the peripheral edge of the key part 2 as a base end. And the fitting part 4 in which the flange 102 of the container 100 for drinks fits in the outermost periphery of the cover body 1, ie, the outer side of the base part 3, is provided. The fitting part 4 has a ring shape with the peripheral edge of the base part 3 as a base end, and hangs downward from the key part 2. The kagami part 2, the base part 3, and the fitting part 4 are continuous by sheet molding of the lid body 1 to form one lid body 1.

  The base portion 3 has a ring shape having a width in the radial direction when viewed from above, but is substantially trapezoidal in a cross-sectional shape obtained by cutting the ring. However, with respect to the legs of the base part 3, the outer peripheral wall 33 is longer than the inner peripheral wall 31, and the outer peripheral wall 33 hangs down below the position of the heel part 2. There is no bottom bottom of the base 3. That is, the pedestal 3 includes an inner peripheral wall 31 that rises from the heel portion 2, a top surface portion 32 that is bent from the upper end of the inner peripheral wall 31 and extends parallel to the heel portion 2, and an outer peripheral wall 33 that hangs down from the outer periphery of the top surface portion 32 It is defined by.

  The inner peripheral wall 31 rises with the peripheral edge of the key portion 2 as a base end, and a step portion 311 parallel to the key portion 2 is provided in the middle. The step portion 311 makes a round along the inner peripheral wall 31 at the same height. Therefore, the inner peripheral wall 31 is divided into an upper inner peripheral wall 312 from the top surface portion 32 to the stepped portion 311 and a lower inner peripheral wall 313 from the stepped portion 311 to the kagami portion 2. The upper inner peripheral wall 312 is erected on the radially outer side of the lid 1 with respect to the lower inner peripheral wall 313. In other words, the step portion 311 protrudes inward in the radial direction of the lid body 1, and the inner peripheral wall 31 has a lower inner peripheral wall 313 below the step portion 311 and a lid body above the upper inner peripheral wall 312 above the step portion 311. 1 protrudes radially inward. Therefore, as shown in FIG. 3, the base 3 is narrow in the radial direction above the step 311 and wide in the radial direction below the step 311. Note that a plurality of step portions 311 may be provided at different heights.

  The step 311 is provided with stack botches 314 at a plurality of locations. The stack button 314 is a hollow such as a hemisphere or a frustum, and is recessed downward from the step 311. The main function of the stack button 314 is to suppress the occurrence of blocking in the stacked state in which the lids 1 are stacked, but it also improves the rigidity of the inner peripheral wall 31.

  It is preferable that the top surface portion 32 includes not only a flat surface but also a rounded portion 321 in which the inner peripheral edge or both the inner peripheral edge and the outer peripheral edge are rounded on one round. The width of the top surface portion 32 is desirably 2 mm or less from the viewpoint of thickening the inner peripheral wall 31 by sheet molding using a male mold, and the flat region excluding the rounded portion 321 is desirably 1.5 mm or less.

  The outer peripheral wall 33 has an inclination angle changing point 331 that extends straight from the top surface portion 32 to the fitting portion 4 or changes in inclination angle in the middle. When the inclination angle change point 331 is provided, the inclination angle differs between the upper outer peripheral wall 332 from the inclination angle change point 331 to the top surface portion 32 and the lower outer peripheral wall 333 from the inclination angle change point 331 to the fitting portion 4. ing. For example, the outer peripheral wall 33 may bulge outward in the middle from the top surface portion 32 to the fitting portion 4. In other words, the draft angle of the upper outer peripheral wall 332 may be made larger than the draft angle of the lower outer peripheral wall 333 around the inclination angle change point 331, and may be narrowed further toward the upper side.

  The upper surface portion 41 of the fitting portion 4 extends from the end of the outer peripheral wall 33 of the base portion 3 in the radial direction of the lid body 1 until it has the same diameter as the flange 102 of the beverage container 100. Further, the side surface portion 42 of the fitting portion 4 hangs down so as to wrap the flange 102 from the outer peripheral edge of the upper surface portion 41. Large protrusions 43 and small protrusions 44 are alternately arranged in a line along the circumference on the inner peripheral surface of the fitting portion 4.

  The large protrusion 43 and the small protrusion 44 bulge in an arc shape on the inside in the radial direction of the lid body 1, and the shape thereof is a half rugby ball shape, which is long in the circumferential direction of the lid body 1. The large protrusion 43 has a larger protrusion amount than the small protrusion 44. The number of the large protrusions 43 and the small protrusions 44 may be adjusted so that the small protrusions 44 are arranged on the opposite side of the large protrusion 43 across the center of the lid 1.

  A space between the row of the large protrusions 43 and the small protrusions 44 and the upper surface portion 41 is a fitting pocket 45. That is, when the lid 1 is placed on the beverage container 100, the flange 102 gets over the large protrusion 43 and the small protrusion 44, and the flange 102 fits into the fitting pocket 45. Thereby, the cover body 1 unites with the container 100 for beverages. Further, by alternately arranging the large protrusions 43 and the small protrusions 44, it is possible to adjust the fitting strength with respect to the difference in the container cut diameter in the cap mounting process in the manufacturing process.

  With reference to FIG. 5, the dimensional relationship of each part of the lid 1 will be described. FIG. 5 is a cross-sectional view clearly showing the dimensional relationship of the lid 1. First, the thickness A of the inner peripheral wall 31 of the pedestal 3 is thicker than the thickness B of the outer peripheral wall 33 of the pedestal 3. The thickness of the wall or the wall thickness is the thickness of the wall. Next, the kagami part 2 extends to a position D lower than the height C which is half of the outer peripheral wall 33 provided in the base part 3. The height of the outer peripheral wall 33 is the length from the upper surface portion 41 to the top surface portion 32 of the fitting portion 4.

  The inclination angle change point 331 is formed at a position E higher than at least the position D of the key portion 2, that is, formed on the top surface portion 32 side than the key portion 2, and preferably half of the outer peripheral wall 33 provided in the base portion 3. It is formed at a position higher than the height C. For example, the draft angle of the upper outer peripheral wall 332 is 8 degrees and the draft angle of the lower outer peripheral wall 333 is 7 degrees, for example, with the inclination angle change point 311 as the center.

  Further, the distance F between the upper surface portion 41 of the fitting portion 4 and the bottom surface of the biting portion 2 is at least a distance G from the diameter G of the straw insertion port 21 so that the straw insertion port 21 opens when the straw is inserted. The height of the key portion 2 is set. The height H of the fitting pocket 45, that is, the length H between the row of the large projections 43 and the small projections 44 and the upper surface portion 41 is longer than the thickness J of the flange 102. For example, in the fitting pocket 45, the space between the row of the large projections 43 and the small projections 44 and the upper surface portion 41 is longer than the thickness of the flange 102 by about 0.25 mm.

  Further, the thickness of the thermoplastic resin sheet is set to 100%. At this time, although there is a manufacturing tolerance, it is preferable that the thickness of the top surface portion 32 be within 87% to 95%. The wall thickness of the outer peripheral wall 33 is preferably within 57% to 67%. The wall thickness of the inner peripheral wall 31 is preferably thicker than that of the outer peripheral wall 33 and within 67% to 77%. These thickness values are obtained by measuring the thickest part of each part. For the outer peripheral wall 33, it is desirable to measure the position of the upper inner peripheral wall 312 for the upper side and for the inner peripheral wall 31.

  Convert the thickness of the top surface portion 32 as 100%. If it does so, it is preferable that the wall thickness of the outer peripheral wall 33 is settled in 60% or more and 77% or less. The wall thickness of the inner peripheral wall 31 is preferably thicker than that of the outer peripheral wall 33 and within 70% to 88%. Further, when converted into a ratio between the thickness of the outer peripheral wall 33 and the thickness of the inner peripheral wall 31, the thickness of the inner peripheral wall 31 is preferably more than 1.0 to 1.45 times less than the thickness of the outer peripheral wall 33. .

(2. Manufacturing method)
Such a lid 1 can be manufactured as follows. As shown in FIG. 6, the lid 1 is produced by sheet molding using a thermoplastic resin sheet 200. The thermoplastic resin sheet 200 is made of, for example, polyethylene terephthalate, polyvinyl chloride, polystyrene, polyethylene, polypropylene, or polycarbonate.

  In the molding machine, the flat thermoplastic resin sheet 200 is sucked and heated by a heated platen and softened, and the male mold 201 of the lid body 1 is pressed from one side of the thermoplastic resin sheet 200. Compressed air is pressed against the thermoplastic resin sheet 200 from the heated hot platen side so that the thermoplastic resin sheet 200 is stretched and brought into close contact with the male mold 201. In the molding machine, a plurality of male dies 201 are arranged vertically and horizontally at regular intervals. In the molding machine, a plurality of male dies 201 are pressed against a single thermoplastic resin sheet 200 at the same time. Therefore, a plurality of lids 1 are produced simultaneously from one thermoplastic resin sheet 200.

  Here, as shown in FIG. 6A, in the molding machine, first, the portion corresponding to the top surface portion 32 of the male mold 201 hits the thermoplastic resin sheet 200 first. Since the temperature T2 at the position of the top surface portion 32 of the male mold 201 is lower than the temperature T1 of the thermoplastic resin sheet 200, the top surface portion 32 is cooled and the stretchability of the top surface portion 32 is lowered. However, in the lid 1, the width of the top surface portion 32 is thin and the region that is difficult to extend is narrow. Therefore, many materials flow and extend toward the inner peripheral wall 31 and the outer peripheral wall 33. Thus, the thin width of the top surface portion 32 contributes to increasing the thickness of the inner peripheral wall 31 and the outer peripheral wall 33.

  Further, when the round portion 321 is provided, the material can flow more easily toward the inner peripheral wall 31 and the outer peripheral wall 33. Accordingly, the rounded portion 321 formed on the top surface portion 32 contributes to the direction of increasing the thickness of the inner peripheral wall 31 and the outer peripheral wall 33.

  Also, as shown in FIG. 6B, the thermoplastic resin sheet 200 extending from the top surface portion 32 hits a portion corresponding to the step portion 311 in the male mold 201. Since the temperature T2 at the position corresponding to the step portion 311 of the male mold 200 is colder than the temperature T1 of the thermoplastic resin sheet 200, the material extended from the top surface portion 32 is cooled by the step portion 311 and the upper inner peripheral wall at the step portion 311. The stretching of 312 is dull. Therefore, the upper inner peripheral wall 312 does not extend too much, and the thickness is ensured. Moreover, the thickness of the cooled step part 311 is also ensured.

  Further, the material is stretched from the step portion 311 whose thickness is secured by cooling, and the material is stretched from the crack portion 2 to the extent that it is difficult to stretch from the step portion 311, thereby forming the lower inner peripheral wall 313. . Therefore, a material necessary for forming the lower inner peripheral wall 313 is sufficiently supplied, and the thickness of the lower inner peripheral wall 313 is ensured.

  On the other hand, since the outer peripheral wall 33 does not have the step portion 311, the outer peripheral wall 33 is not cooled in contact with the male mold 201 on the way, and the outer peripheral wall 33 is thinner than the inner peripheral wall 31. As described above, in the lid body 1, the top surface portion 32 is thin, the inner peripheral wall 31 is provided with the step portion 311, and each of these factors causes the base portion 3 to have the inner peripheral wall 31 rather than the outer peripheral wall 33. The meat is thick.

(3. Action)
7 to 11 show a state where the beverage container 100 has fallen and collided with the ground from the lid 1. As shown in FIGS. 7 to 11, it is assumed that a so-called offset collision occurs in which the vertical direction intersects the axial direction of the lid body 1 and the beverage container 100 with respect to the ground 300. 7 to 9 and FIGS. 10 and 11 have different offset amounts.

  That is, FIGS. 7 to 9 show a state in which the angle between the vertical direction and the axial direction of the lid 1 and the beverage container 100 is small and the beverage container 100 stands against the ground 300 and collides with the ground. 10 and 11 show a state in which the angle between the vertical direction and the axial direction of the lid body 1 and the beverage container 100 is large, and the beverage container 100 collides with the ground in a state where the beverage container 100 lies down. Yes. In the following, it will be described that the manner in which the lid 1 is crushed differs depending on the angle difference between the vertical direction and the axial direction of the lid 1 and the beverage container 100 when colliding with the ground 300.

(3-1. Collision with beverage container 100 standing)
As shown in FIG. 7, one place of the base part 3 of the cover body 1 and the ground 300 come into contact by dropping. The outer peripheral wall 33 of the base 3 is thinner than the inner peripheral wall 31. For this reason, the inner wall 31 is bent more than the inner wall 31 and the outer wall 33 is bent. Since the middle bent portion 5 of the outer peripheral wall 33 is sharpened and bent toward the inside of the lid body 1 and is crushed by the collision, the tip thereof advances obliquely downward toward the aluminum sheet 101.

  On the other hand, the inner peripheral wall 31 is thick due to the narrow width of the top surface portion 32 and the provision of the step portion 311, for each of these reasons. Further, since the upper inner peripheral wall 312 and the lower inner peripheral wall 313 are shorter than the outer peripheral wall 33 due to the division by the step portion 311, the upper inner peripheral wall 312 and the lower inner peripheral wall 313 are not easily buckled. It has become. Furthermore, the stack boc 314 formed in the step portion 311 serves as a rib to increase the rigidity of the inner peripheral wall 31. Therefore, once the middle folded portion 5 is generated in the outer peripheral wall 33, destruction proceeds at the middle folded portion 5, and in many cases, the inner peripheral wall 31 can be avoided.

  As shown in FIG. 8, as the crushing progresses, the folded portion 5 approaches the inner peripheral wall 31 that has been prevented from being destroyed, and finally, the folded portion 5 comes into contact with the inner peripheral wall 31. The inner peripheral portion 31 prevents the hand that presses down the folded portion 5 as it is, and prevents the folded portion 5 from reaching the aluminum sheet 101. That is, the inner peripheral wall 31 is thicker than the outer peripheral wall 33, so that the inner peripheral wall 31 comes into contact with the middle bent portion 5 generated in the outer peripheral wall 33, and the middle bent portion 5 expands toward the aluminum sheet 101. It becomes a barrier that prevents you from going.

  The middle folded portion 5 is likely to occur at the middle position of the outer peripheral wall 33. Therefore, the kagami portion 2 extends to a position lower than the half height of the outer peripheral wall 33. In other words, the inner peripheral wall 31 extends further downward than the portion where the middle bent portion 5 is likely to occur. Therefore, the defensive range of the inner peripheral wall 31 is sufficiently wide, and even if the middle folding part 5 advances obliquely downward, the middle folding part 5 is suppressed from diving under the cracking part 2, and reaches the aluminum sheet 101. Making it even more difficult.

  When the outer peripheral wall 33 is provided with the inclination angle changing point 331, the bent portion 5 is frequently generated at the inclination angle changing point 331. In other words, the tilt angle change point 331 becomes a middle folding control unit that controls the generation point of the middle folding unit 5. And the Kagami part 2 extends to a position lower than the tilt angle changing point 331. Therefore, it is further suppressed that the middle folding part 5 advances so as to reach the aluminum sheet 101 under the keying part 2.

  Next, as shown in FIG. 9, in the fitting pocket 45 that accommodates the flange 102, the space between the row of the large projections 43 and the small projections 44 and the upper surface portion 42 is longer than the overall height of the flange 102. Therefore, the lid 1 and the beverage container 100 are fitted with play. If it does so, with the impact which the container 100 for drinks collided with the ground 300, the cover body 1 and the container 100 for drinks will bound separately, and the cover body 1 will become easy to remove | deviate.

  At this time, as shown in FIG. 9, the lid body 1 comes off from the portion 1 a not in contact with the ground 300. Therefore, the lid 1 rotates with the collision point as a fulcrum, the lid 1 is parallel to the ground 300, and the entire ring-shaped platform 3 abuts against the ground 300. As a result, the lid 1 can be easily removed, so that the impact that has come into contact with the ground 300 can be received by the entire base part 3, and the collision force is distributed throughout the base part 3, thereby mitigating the expansion of the middle folding part 5. can do. That is, it becomes easy to receive the bent portion 5 by the inner peripheral wall 31. In addition, even if the bent portion 5 slips on the inner peripheral wall 31 and tries to proceed to the aluminum sheet 101, the possibility that the bent portion 5 grows until reaching the aluminum sheet 101 is reduced.

  Furthermore, regarding the ease of detachment of the lid body 1, the large protrusions 43 and the small protrusions 44 are alternately arranged in the fitting portion 4. The large protrusion 43 has many portions that are in contact with the flange 102, and the flange 102 gets over the large protrusion 43 and is not easily detached from the fitting pocket 45. On the other hand, the small protrusion 44 has few portions in contact with the flange 102, and the flange 102 easily gets over the small protrusion 44 and is detached from the fitting pocket 45.

  Therefore, the large protrusion 43 improves the difficulty of detachment, and the small protrusion 44 improves the detachability, and the lid body 1 and the beverage container 100 fit properly when the beverage container 100 is not dropped. When the beverage container 100 falls and collides with the ground 300 from the lid 1, the lid 1 is smoothly removed. Therefore, the large protrusion collision can be received by the entire base portion 3.

  Furthermore, when the large protrusion 43 is adjusted so that the opposite side of the large protrusion 43 becomes the small protrusion 44, if the position of the large protrusion 43 is a collision point with the ground 300, the small protrusion is located at a position opposite to the collision point across the center. The protrusions 44 are arranged, and the side opposite to the collision part is easily removed with the center in between. Further, if the position of the small protrusion 44 is a collision point with the ground 300, the part opposite to the collision part is the large protrusion 43, but the adjacent both sides of the large protrusion 43 are the small protrusions 44. The side opposite to the location is easy to come off. Accordingly, the lid body 1 is removed, and the entire base portion 3 is easily brought into contact with the ground 300.

  In this way, the row of the large protrusions 43 and the small protrusions 44 of the lid 1 and the fitting pocket 45 each easily remove the lid 1 from the beverage container 100 and prevent the impact from concentrating on one point. It becomes an impact relaxation part, the expansion growth of the middle folding part 5 is blocked | prevented, and the middle folding part 5 makes it difficult to advance to the aluminum sheet 101. FIG.

(3-2. Collision when beverage container 100 is in a sleeping state)
As shown in FIG. 10, when the lid body 1 and the beverage container 100 are in a sleeping state and collide with the ground 300, an impact force is applied in the range extending to the outer peripheral wall 33 or the outer peripheral wall 33 and the top surface portion 32. Therefore, the outer peripheral wall 33, the top surface portion 33, and the upper inner peripheral wall 312 tend to fall inward in the radial direction. Here, since the step portion 311 projects radially inward, the rigidity of the upper inner peripheral wall 312 is enhanced, and the fall of these portions 33, 33, 312 is suppressed. In other words, the step portion 311 functions as a rib protruding perpendicular to the upper inner peripheral wall 312. In particular, since the step portion 311 is provided in an annular shape along the circumferential direction, the rigidity of the upper inner peripheral wall 312 is further improved.

  Further, since the step portion 311 projects radially inward, the lower inner peripheral wall 313 projects radially inward from the upper inner peripheral wall 312. Therefore, the upper part of the step part 331 of the base part 3 is narrower than the lower part of the step part 311, so that the outer peripheral wall 33, the top surface part 32, and the upper inner peripheral wall 312 have fallen inward in the radial direction of the lid body 1. Can also be supported by the stepped portion 311 and the lower inner peripheral wall 313. That is, the step portion 311 and the lower inner peripheral wall 313 function as ribs, and the step portion 311 and the lower inner peripheral wall 313 fall down and prevent progress. Alternatively, even if the collapse proceeds, the step 311 comes into contact and the lower inner peripheral wall 313 supports the step 311, which also serves as a physical barrier. As a result, the falling is prevented and the aluminum sheet 101 can be prevented from breaking through.

  Further, as shown in FIG. 11, when the outer peripheral wall 33 tries to fall inward in the radial direction, the outer peripheral wall 33 is provided in an annular shape, so that the impact is dispersed in the circumferential direction of the lid body 1. Therefore, an impact is applied to the partial range R of the outer peripheral wall 33, and the outer peripheral wall 33 falls inside with the range R. On the other hand, since the step portion 311 and the lower inner peripheral wall 313 are provided in an annular shape in the circumferential direction of the lid body 1, even if the outer peripheral wall 33 falls inward with a range R, it has a range. Can support.

  Further, since the width of the top surface portion 32 is 2 mm or less, when the outer peripheral wall 33 falls inward with the range R, the fold line 34 is easily formed at the end of the range R. The fold line 34 is formed in the vicinity including the top surface portion 32. That is, it is formed on the top surface portion 32, the outer peripheral wall 33, and the upper inner peripheral wall 312. The fold line 34 is likely to be formed when the width of the top surface portion 32 is narrow. Since the step portion 311 is provided in an annular shape and the rigidity of the upper inner peripheral wall 312 is improved, the fold line 34 is further easily formed in the vicinity of the top surface portion 32. Since the impact is absorbed at the fold line 34, the breakage of the step 311 below is suppressed, and as a result, the aluminum sheet 101 can be prevented from being broken through.

(4-1. Example)
Example 1
A thermoplastic resin sheet 200 having a thickness of 0.280 mm was molded with the male mold 201 to produce the lid body 1 of Example 1. Regarding the top surface portion 32 of the male mold 201, the entire width is 2 mm, the round portion 321 is provided, and the width of the flat portion is 1.5 mm. The upper inner peripheral wall 312 of the male mold 201 has a height of 3.5 mm, and the lower inner peripheral wall 313 has a height of 3.5 mm. The width of the step portion 311 is 1.5 mm. The height of the outer peripheral wall 33 is 13 mm.

  At this time, the lid 1 of Example 1 had a thickness of the top surface portion 32 of 0.261 mm. When the thickness of the thermoplastic resin sheet 200 is 100%, it corresponds to 93.2%. The wall thickness of the outer peripheral wall 33 was 0.178 mm when measured on the upper side, corresponding to 63.6% of the thermoplastic resin sheet 200. As for the inner peripheral wall 31, when the upper inner peripheral wall 312 was measured at the same measurement position as the outer peripheral wall 33, the wall thickness was 0.211 mm, corresponding to 75.3% of the thermoplastic resin sheet 200. In addition, the thickness of the Kagami part 2 was 0.213 mm in the location near the lower inner peripheral wall 313, and the central part was 0.234 mm. It corresponded to 76.0% and 83.5%.

(Comparative Example 1)
A thermoplastic resin sheet 200 having a thickness of 0.280 mm was molded with another male mold, and the lid 1 of Comparative Example 1 was produced. Regarding the top surface portion of this molded product, the total width is 4.6 mm, and there is no rounded portion 321. This molded product does not include the step portion 311, and the inner peripheral wall of the base portion 3 is straight. And the inner peripheral wall of this molded product has a height of 4.5 mm, and the outer peripheral wall 33 has a height of 13 mm.

  At this time, the thickness of the top surface portion of the lid body of Comparative Example 1 was 0.279 mm. When the thickness of the thermoplastic resin sheet 200 is 100%, it corresponds to 99.6%. Since the top surface is wide and the wide area is cooled by a male mold, it can be confirmed that the stretchability is lowered and the thickness is maintained.

  Moreover, the thickness of the outer peripheral wall of Comparative Example 1 was 0.203 mm when measured on the upper side having the same height as Example 1, corresponding to 72.5% of the thermoplastic resin sheet 200. On the other hand, the wall thickness of the inner peripheral wall was 0.184 mm when the same height as the outer peripheral wall was measured. The inner peripheral wall of Comparative Example 1 has a height of 4.7 mm, which is approximately 67% of the total of 7 mm of Example 1, and despite that the amount of stretching is small, it is 65.7% of the thermoplastic resin sheet 200. It was confirmed that the inner peripheral wall was thinner than the outer peripheral wall.

  Here, while the thickness near the inner peripheral wall 31 of the crack portion 2 of Example 1 is reduced to 76%, the thickness near the inner peripheral wall of the crack portion of Comparative Example 1 is maintained at 95.3%. It had been. That is, in Comparative Example 1 in which no step portion was provided on the inner peripheral wall, it was confirmed that the inner peripheral wall became thin because the sheet was stretched as it was without any thickness remaining on the inner peripheral wall during molding. As described above, in Example 1 in which the top surface portion 32 is narrowed or the step portion 311 is provided on the inner peripheral wall 31, it is confirmed that the inner peripheral wall 31 is thicker than the outer peripheral wall 33. It was.

(4-2. Drop test 1)
The lid 1 of Example 1 and Example 2 and the lids of Comparative Example 1 and Comparative Example 2 having the dimensions shown in Table 1 below are fitted into a beverage container 100 in which beverages are sealed with an aluminum sheet 101, and the lid It was dropped from a height of 130 cm with the side down. The height of 130 cm is assumed to be the height displayed at a store such as a convenience store. In the second embodiment, as in the first embodiment, the top surface portion 32 is 2 mm and the step portion 311 is provided, so that the inner peripheral wall 31 is thicker than the outer peripheral wall 33.

  During the drop test, a high-speed camera (Casio Computer Co., Ltd. EX-F1) was used to take a video. Then, 10 cases were employed in each example and comparative example (n = 10) in which each of the examples and the comparative examples viewed the moving image and obliquely collided with the ground from the lid 1. And about each employ | adopted, it was confirmed visually whether the broken part 5 reached | attained the aluminum sheet 101 when the middle broken part 5 reached | attained. The results are shown in Table 2 below.

  As shown in Table 2, in the case of the lid body 1 of each example, the frequency at which the aluminum sheet 101 was broken due to the folded portion 5 was reduced as compared with the lid body of the comparative example. That is, although the middle folding part 5 has occurred, the middle folding part 5 is stopped by the inner peripheral wall 31, and the lid 1 is detached from the beverage container 100, so that the entire base part 3 touches the ground and the impact is dispersed. It was confirmed that the frequency with which the aluminum sheet 101 reached the folded portion 5 decreased.

  In particular, the lid 3 of Example 2 in which the width of the top surface part 32 is set to 2 mm and the step part 311 is installed, and the cradle part 2 is placed at a lower position, the inner bent parts 5 are all inside. There was no case that was stopped by the peripheral wall 31 and broke through the aluminum sheet 101. By extending the inner peripheral wall 31, it is considered that the defense range of the inner peripheral wall 31 is widened, and that the middle folded portion 5 does not slide to the aluminum sheet 101 side.

(4-3. Impact test)
Furthermore, the lid body 1 of Example 2 and the lid body of Comparative Example 1 were fitted into a beverage container 100 in which a beverage was sealed with an aluminum sheet 101, fixed with the lid side down, and an impact tester ( The test was carried out at an impact strength assuming a free fall height of 120 cm at Gunma Prefectural Gunma Industrial Technology Center (ASQ-700, Yoshida Seiki Co., Ltd.) (n = 10).

  Unlike the free drop in the drop test, the impact tester moves up after the table with the verification sample fixed is lowered and transmits the impact, so the coffee beverage as the content behaves and the load of the content does not necessarily concentrate on the aluminum sheet. . For this reason, when the bent portion 5 comes into contact with the aluminum sheet, the load does not concentrate on the aluminum sheet, so it is difficult to confirm the phenomenon of breaking through the aluminum. For this reason, it was visually confirmed whether or not the center end of the bent portion was sharpened and reached lower than the heel portion 2. The results are shown in Table 3 below.

  As shown in Table 3, in Comparative Example 1, all the bent portions 5 were sharpened by the impact strength and reached the aluminum sheet 101. On the other hand, in the case of the lid body 1 of Example 2, the folded portion 5 was generated due to the impact strength, but was all stopped by the inner peripheral wall 31, and the folded portion 5 did not reach the aluminum sheet 101. Moreover, in Example 2, since the intensity | strength of the inner peripheral wall 31 was fully maintained, it was confirmed that the kagami part 2 descend | falls to the aluminum sheet 101 so that it may descend | fall to the aluminum sheet 101 and may contact | connect in a surface. .

  From the above results, even when the consumer intentionally strikes the top surface portion 2 against a desk or the like, even if the folded portion 5 is generated, the inner peripheral wall 31 prevents the folding portion 5 from being formed. Therefore, the possibility of the aluminum sheet 101 being broken through is reduced.

(4-4. Drop test 2)
The lid 1 of Example 3 and the lids of Comparative Example 2 and Comparative Example 3 having the dimensions shown in Table 4 below are fitted into a beverage container 100 in which a beverage is sealed with an aluminum sheet 101, with the lid side down. The drink container 100 and the lid 1 are fixed to a testing machine (Tokyo Metropolitan Industrial Technology Center, DT-205H, manufactured by Shinei Technology Co., Ltd.) in the state of sleeping from 1 o'clock in the above drop test, and free from a height of 110 cm. I dropped it. The height of 110 cm is assumed to be about the middle level of a display shelf in a store such as a convenience store.

  In Example 3, the width of the top surface portion 32 is a width including the rounded portion 321, and the width of the flat portion is 1.5 mm. The comparative example 2 is the same as the above, and does not have the step part 311. That is, the inner peripheral wall and the outer peripheral wall hang down straight from the flat top surface portion inside and outside. The top surface is the thickest (about 0.28 mm), and the outer peripheral wall is the thinnest. The wall thickness distribution of the outer peripheral wall is about 0.201 mm at the top, about 0.193 mm at the center, and about 0.188 mm at the bottom. Comparative Example 3 has rounded portions on the inside and outside of the flat top surface portion, and the rounded portion on the outer side is rounder than the rounded portion on the inside. The inner peripheral wall is straight without the step 311 and the outer peripheral wall is also straight.

During the drop test, a high-speed camera (Casio Computer Co., Ltd. EX-F1, EX-100F) was used to take a video. Moreover, it was confirmed visually whether the aluminum sheet 101 was torn. The results are shown in Table 5 below. For Comparative Example 2 and Comparative Example 3, the number of verification samples was 40, and for Example 3, the number of verification samples was 110 cm at a height of 31, and the number of verification samples was 4 at a height of 120 cm. .

  As shown in Table 5, in Example 3, it was confirmed that the aluminum sheet 101 was not broken in all 35 verification samples. The outer peripheral wall 33, the top surface portion 32, and the upper inner peripheral wall 312 fall to the inside of the lid body 1 due to the collision with the ground, but the repulsive force is large, and the jumped height is the largest in Example 3 and Comparative Examples 2 and 3 Met. Although the outer wall 33, the top surface 32, and the upper inner wall 312 fall down, the impact is dispersed in the circumferential direction of the lid 1, and the elastic force is supported by the support of the step 311 and the lower inner circumferential wall 313 extending in the circumferential direction. It is thought that it was demonstrated.

  In Comparative Example 2, it was confirmed that the aluminum sheet 101 was broken in all 40 verification samples. It was confirmed that the thick top surface collides with the ground, but the outer peripheral wall is thin, so the central portion of the outer peripheral wall is crushed and sharpened inside the lid, and has broken through the aluminum sheet 101. .

  In Comparative Example 3, it was confirmed that the aluminum sheet 101 was broken in 19 out of 40 verification samples. When the verification sample in which the tear of the aluminum sheet 101 is confirmed is verified, the round portion outside the top surface collides and is pushed into the ground, sharpens in a V shape toward the aluminum sheet 101, and the roundness The tip of the sharpened portion formed in the rounded portion advances to the aluminum sheet 101 by the central portion of the outer peripheral wall that is thinner than the top surface portion being crushed in the circumferential direction by the impact received by the portion, and the aluminum sheet 101 It was confirmed to break through.

(5. Effect)
In this way, the lid body 1 is provided with a base portion 3, and the lid 1 has a barrier that prevents the inner peripheral wall 31 from progressing to the aluminum sheet 101 with respect to the possibility of the middle bent portion 5 being formed on the outer peripheral wall 33. It was. And in order to further enhance the function as a barrier, first, various measures to increase the reliability of the inner peripheral wall 31 as a barrier are performed, secondly, a measure to expand the defense range of the inner peripheral wall 31 is performed, and thirdly, A middle folding control measure in which the middle folding portion 5 is generated within the defense range of the inner peripheral wall 31 was applied, and fourth, an impact dispersion measure for dispersing the impact energy that propagates the middle folding portion 5 was taken.

  That is, first, the inner peripheral wall 31 is thicker than the outer peripheral wall 33 so that the inner peripheral wall 31 functions as a barrier. Preferably, the thickness of the inner peripheral wall 31 is set to be more than 1.0 to 1.45 times less than the outer peripheral wall 33. For this purpose, the inner peripheral wall 31 is provided with a step portion 311, thereby increasing the thickness of the inner peripheral wall 31 and increasing the strength. As long as the effect of increasing the thickness of the inner peripheral wall 31 is generated, the stepped portion 311 may have a plurality of steps.

  Further, the inner peripheral wall 31 is divided into an upper inner peripheral wall 312 and a lower inner peripheral wall 313, each of which is shorter than the case where there is no step portion 311, and is difficult to buckle. Further, the top surface portion 32 was set to have a radial width of 2 mm or less. Thereby, the meat of the thermoplastic resin sheet 200 becomes easy to extend to the inner peripheral wall 31 side, the thickness of the inner peripheral wall 31 is increased, and the strength is increased.

  Moreover, the top surface part 32 was made to have the rounded part 321 chamfered by both the inner periphery and the outer periphery. As a result, the thickness of the thermoplastic resin sheet 200 tends to flow toward the inner peripheral wall 31, and the thickness of the inner peripheral wall 31 increases and the strength increases. The purpose is to increase the thickness of the inner peripheral wall 31, and the rounded portion 321 may be at least on the inner peripheral edge of the top surface portion 32.

  Further, one or more stack botches 314 are formed on the step portion 311. Thereby, the rigidity of the inner peripheral wall 31 increases.

  Next, as a measure for expanding the defense range of the inner peripheral wall 31, the kagami portion 2 extends downward from the middle position of the outer peripheral wall 33 opposite to the top surface portion 32. That is, the inner peripheral wall 31 was extended downward. As a result, the possibility of the folded portion 5 going to the aluminum sheet 101 while avoiding the inner peripheral wall 31 is reduced.

  Further, as a middle folding control measure in which the middle folding portion 5 is generated within the defense range of the inner circumferential wall 31, the outer circumferential wall 33 is provided with an inclination angle changing point 331 at which the inclination angle of the outer circumferential wall 33 is changed. The angle change point 331 extends below the opposite side of the top surface portion 32. As a result, the middle folding portion 5 is likely to occur at the tilt angle change point 331, that is, the middle folding portion 5 is likely to occur within the defense range of the inner circumferential wall 31, and the inner folding wall 5 may be stopped. Will increase.

  And as an impact dispersion | distribution measure which disperse | distributes the impact energy which advances the bending part 5, the fitting part 4 has the large protrusion 43 with a relatively large bulging amount, and the small protrusion 44 with a relatively small bulging amount. Are arranged alternately in a line along the circumferential direction of the inner peripheral surface. When the flange 102 passes over the large protrusion 43 and the small protrusion 44 and is accommodated in the fitting portion 4, the beverage container 100 and the lid body 1 are combined.

  In addition, the fitting portion 4 includes a fitting pocket portion 45 that accommodates the flange 102 upward from the row of the large protrusions 44 and the small protrusions 43. The fitting pocket 45 is higher than the height of the flange 102 and accommodates the flange 102 with play.

  Each of these causes the lid 1 to be easily detached from the beverage container 100 when receiving an impact large enough to generate the folded portion 5, and the impact can be received by the entire base portion 3. Since it disperses | distributes except the folding part 5, it can suppress that the middle folding part 5 progresses to the aluminum sheet 101. FIG.

  In the present embodiment, the large protrusions 43 and the small protrusions 44 having different bulge amounts are provided along the circumference on the inner peripheral surface of the fitting portion 4, but the bulge amount is changed instead of these protrusions 43 and 44. You may make it provide the same protrusion. Even if the bulging amount of the protrusion is the same, it is possible to obtain an effect of preventing the progress of the folded portion 5 to the aluminum sheet 101.

  Further, the step portion 311 protrudes radially inward. Thereby, the rigidity of the upper inner peripheral wall 312 can be improved, and the outer peripheral wall 33, the top surface portion 32, and the upper inner peripheral wall even if the lid 1 and the axis of the beverage container 100 collide with the ground while lying on the ground. The falling of 312 can be suppressed, and the aluminum sheet 101 can be prevented from breaking through.

  Furthermore, the inner peripheral wall 31 is configured such that the lower inner peripheral wall 313 below the step 311 protrudes radially inward from the upper inner peripheral wall 312 above the step 311. Thereby, even if the axis | shaft of the cover body 1 and the container 100 for drinks collides in the state which fell to the ground, the outer peripheral wall 33, the top | upper surface part 32, and the upper side inner peripheral wall 312 fall down to the radial inside of the cover body 1. In addition, since it is supported by the step portion 311 and the lower inner peripheral wall 313, it is possible to prevent the outer wall 33, the top surface portion 32, and the upper inner peripheral wall 312 from collapsing. Therefore, the aluminum sheet 101 can be prevented from breaking through. Thus, even if the drop angle or the collision angle changes, it is possible to cope with the prevention of the aluminum sheet 101 from breaking through.

  In particular, the step portion 311 and the lower inner peripheral wall 313 are provided in an annular shape in the circumferential direction of the lid body 1. As a result, the rigidity of the upper inner peripheral wall 312 can be improved, and the impact received by the outer peripheral wall 33 can be distributed and received in the circumferential direction. Can be prevented.

  By setting the width of the top surface portion to 2 mm or less, the fold line 34 is easily formed at the end of the fallen range when the outer peripheral wall 33 is partially collapsed inward. Since the impact is absorbed in the fold line 34, the impact spreading downward to the step portion 311 and the destruction below the step portion 311 are suppressed, and as a result, the aluminum sheet 101 can be prevented from breaking through.

  The outer peripheral wall 33 is provided with an inclination angle change point 331 so as to bulge outward. Thereby, when the shafts of the lid 1 and the beverage container 100 collide with the ground on the ground, the outer peripheral wall 33 bulges outward even if an impact is applied from the outer peripheral wall 33. The impact can be mitigated above and below the outer peripheral wall 33 with the change point 331 as the center, and as a result, the entire outer peripheral wall 33 can be collapsed inward, and the impact concentration can be mitigated. In other words, the generation of the bent portion 5 can be suppressed. In addition, even if the impact is strong and the tilt angle changing point 331 advances inward to generate the middle bent portion 5, the inner peripheral wall 31 serves as a barrier, so that the breakthrough of the aluminum sheet 101 is suppressed.

  The various measures described above suppress the progress of the folded portion 5 to the aluminum sheet 101 or the progress of the aluminum sheet 101 above the stepped portion 311 by the same or different mechanisms. Accordingly, the various measures described above may be used alone or in various combinations of at least two or more, and as included in the scope and gist of the invention, the invention described in the claims And its equivalent range.

DESCRIPTION OF SYMBOLS 1 Cover body 2 Kagami part 21 Straw insertion port 3 Base part 31 Inner peripheral wall 311 Step part 312 Upper inner peripheral wall 313 Lower inner peripheral wall 314 Stack boch 32 Top surface part 321 Round part 33 Outer peripheral wall 331 Inclination angle change point 332 Upper outer peripheral wall 333 Lower outer peripheral wall 34 Fold 4 Fitting part 41 Upper surface part 42 Side part 43 Large protrusion 44 Small protrusion 45 Fitting pocket 5 Middle bent part 100 Beverage container 101 Aluminum sheet 102 Flange 200 Thermoplastic resin sheet 201 Male 300 ground

Claims (4)

Covering the beverage container whose opening is sealed with a sheet from the top of the sheet, a lid body into which the flange of the beverage container is fitted,
Kagami part extending to the central region of the lid,
A ring-shaped pedestal that bulges around the periphery of the key portion,
A fitting portion that is located on the outermost periphery of the lid, and that fits with the flange;
With
The fitting portion is
Large protrusions and small protrusions that bulge inward are arranged alternately in a line along the circumferential direction of the inner peripheral surface,
The large protrusion has a relatively larger bulging amount than the small protrusion,
The small protrusion has a relatively small bulging amount than the large protrusion,
The flange overcoming the large protrusion and the small protrusion and being accommodated in the fitting portion, thereby combining with the beverage container;
A lid characterized by. The opposite side across the lid center from the large protrusion is the small protrusion,
The opposite side across the center of the lid from the small protrusion is the large protrusion,
The lid according to claim 1. The fitting portion is
A fitting pocket for accommodating the flange upward from the row of the large protrusion and the small protrusion;
When the flange is fitted into the fitting portion, the fitting pocket is wider than the thickness of the flange and accommodates with a play with respect to the thickness of the flange;
The lid according to claim 1 or 2, characterized by the above-mentioned. The platform is
An inner peripheral wall rising from the kagami portion;
A top surface portion bent from the upper end of the inner peripheral wall and extending in parallel with the kagami portion;
An outer peripheral wall depending from the outer peripheral edge of the top surface portion;
Defined by
The inner peripheral wall is thicker than the outer peripheral wall;
The lid according to any one of claims 1 to 3.

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