JP2018062368A - Container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container lid which, made by sheet molding, can be used repeatedly as it is hard to deform even if one removes it from a main body opening by gripping by fingers the lower end of a side wall, pulling and bending a lifting top part upward.SOLUTION: Container lid A which, monolithically molded by sheet molding method using jumbo roll synthetic resin, consists of a disc shaped top part 1 and a side wall 2, and the lid is characterized as such that, a cushioning part 3 is formed where said top part 1 and said side wall 2 intersect, and a first rib 4 is formed on said wall 2, and a second side wall 2b is formed on said side wall 2 at a lower end of said first rib 4, and while a third side wall 2c is formed on a lower end of said second side wall 2b, a lid flange 6 is formed on the lower end of said third side wall 2c.SELECTED DRAWING: Figure 3

Description

The present invention relates to a container lid that covers contents such as yogurt and ice cream on a container having an internal capacity that can accommodate a plurality of persons.

  2. Description of the Related Art Conventionally, a plastic container lid has been adopted as a container lid that covers plastic, paper, or can containers. For example, the lid of the container described in Patent Document 1 forms a recess between the thick part protruding inward in the middle part of the side wall part, the thick part and the top plate part, and the thick part Is provided with a plurality of stack rib portions projecting in the direction opposite to the top plate portion, and generating a gap between the thick plate portion where the stack rib portion is not installed and the top plate portion. Proposed. As an effect, the state of whether or not load collapse occurs when stacking a plurality of container lids in order upward, that is, the stacking property is stabilized, and the stacked container lids are prevented from being in close contact with each other. Can be taken out one by one in order.

Further, as an overcap that can be easily fitted into the container body and can be fitted with an engagement crown, and is difficult to be detached when the engagement crown is fitted, and can hold the crown, the opening side of the flange engagement portion described in Patent Document 2 A plurality of elliptical bulging protrusions with a circumferential long axis that bulges inward along the circumferential direction of the lower peripheral wall are provided, and a through hole is installed near the top of the bulging protrusion near the inner outlet of the through hole. An overcap formed by a sheet forming method made of a plastic thin plate material on which a projecting piece is formed has been proposed.

Furthermore, when laminating a plurality of lids in order, laminating in a stable state while fitting a large number of lids up and down by using a hollow rising edge whose upper width is smaller than the lower width, The top edge and step of the upper edge of the lower rising edge of the lower lid are in contact with the ring ridge of the upper rising edge of the upper lid and the peripheral edge of the ceiling panel, so there is no need for upper and lower lids. A packaging container lid described in Japanese Patent Application Laid-Open No. H10-228707 is proposed which is deeply fitted to the cover and prevents it from being pulled out.

Further, as a container lid that can be easily attached and detached and can be securely fitted in response to a slight difference in the diameter of the flange portion of the container, the container lid is fitted so as to face the outer peripheral portion of the container flange portion described in Patent Document 4. A container lid has been proposed in which the wall surface of the lid fitting portion is a polygonal wall having a polygonal shape when viewed from above.

JP 2007-276875 A JP 2003-321053 A Japanese Patent Laid-Open No. 10-120005 JP 2002-337900 A

In recent years, there is a strong demand for consideration of environmental problems and cost reduction of raw materials, and in order to reduce the amount of resin raw materials used, plastic containers and lids are becoming thinner. The container lid described in Patent Document 1 is employed as a container lid that covers a paper container containing yogurt or the like. The lid of the container is formed by an injection molding method, and a pair of molds is constituted by a cavity mold that is a movable mold and a core mold that is a fixed mold. In the injection molding method, the mold and the core mold are brought into contact with each other, the mold is clamped, the synthetic resin material melted at a high temperature is injected from the injection portion with high pressure, and the lid of the container is molded. As an advantage of products molded by the injection molding method, even complicated shapes can be molded according to dimensions by matching the shape formed on the mold side with the different shape formed on the core mold. . In addition, in order to increase the strength and rigidity of the molded product itself, the injection molding method has an advantage that the strength of the product shape can be freely increased by designing a part of the product to be thick.

However, the disadvantage is that the mold for injection molding is expensive, and it is said that the cost is 6 to 10 times or more that of the mold for sheet molding. Furthermore, there is a limit to the thickness of the product when molded by the injection molding method. For example, in the container lid described in Patent Document 1, the flange provided in the opening of the container and the container lid are fitted. It is common to provide a fitting portion that protrudes inwardly to the inside of the side wall of the lid of the container, but the thickness of the fitting portion that is the thickest is 1.925 mm. However, since it is molded with a thin wall thickness of 0.35 mm as a whole, when trying to mold with a thinner wall, it does not reach the entire interior of the mold where the molten synthetic resin material is engraved, but a short shot It is very difficult to mold itself due to troubles such as occurrence of warpage and warpage of the product cooled after molding.

Thus, in order to reduce the resin raw materials used and reduce production costs, the provision of products using the sheet molding method is positioned as one of the effective countermeasures. For example, as a container lid by a sheet forming method, an overcap for a container described in Patent Document 2, a lid for a packaging container described in Patent Document 3, a container lid described in Patent Document 4, and the like have been proposed. Yes.

The overcap for containers described in Patent Document 2 is a lid that covers a container containing a quantity of content that one person can eat and drink, such as juice and coffee, and is easy to fit into the container. In other words, it has been proposed as a shape that is difficult to separate by external vibration generated during transportation. Therefore, since the container and the overcap are both discarded after eating and drinking, the shape is not easy to remove. Rather, it has a shape that is difficult to remove. That is, the shape that does not easily come off means that when the container is covered with a lid, the protruding piece formed on the inner side of the side wall surface of the lid is protruded further inward and is formed on the inner side of the lower end of the flange portion formed near the opening of the container. It is to make it go deeper. Furthermore, the container overcap described in Patent Document 2 increases the height of the side wall extending from the outer periphery to the lower end of the lid, so that when the lid is removed, the height of the side wall becomes a tension resistance and is more difficult to come off. It is in shape.

Moreover, in the lid | cover of the packaging container described in patent document 3, when the lid | covers are piled up and stacked, it has the effect that it prevents the upper and lower lids from being unnecessarily deeply fitted and cannot be removed. However, the place where the container lid fits into the opening of the container body is a hollow rising edge with an inverted U-shaped cross section provided on the outer lid of the ceiling plate of the container lid, so it is formed in the opening of the container When the sealing material is sealed on the flange surface, the shape cannot be fitted.

Furthermore, the container lid described in Patent Document 4 has been proposed as a container lid that can satisfy both the ease of attachment and detachment and the fitting property in response to a subtle difference in the diameter of the container. This is a shape that cannot be fitted in a state where the sheet material is sealed on the flange surface of the opening of the container.

Patent Document 2, Patent Document 3, and Patent Document 4 are methods in which a product shape is formed by using a sheet forming method. In the sheet forming method, one sheet-shaped plastic plate can be heated and processed. In this molding method, the gap between the mold and the sheet is vacuumed or reduced in pressure after being softened, the sheet is brought into close contact with the mold to form a shape, and after cooling, the molded product is taken out by blowing air. For example, when a sheet is molded using a raw plastic sheet plate having a thickness of 0.4 mm, a sheet material is stretched by heat to form a shape. It is not necessarily uniformly formed to 0.4 mm. That is, in order to mold the shape of the product, the sheet material softened by heat is pressed against the mold by blowing air and molded while being stretched. Therefore, although it varies depending on the shape of the product to be molded and the part of the product to be molded, it will be molded with a thin thickness of 0.4 mm or less. In addition, if the height of the side wall of the container lid is made as low as possible, the amount of raw materials can be reduced, and there is an advantage that the container lid can be easily removed from the opening of the container, but the disadvantage is the force applied from the outside In addition, when the lid is removed from the container, the strength of the lid itself is weakened, so that there is a problem that the lid is easily deformed.

The object of the present invention is to solve the above-mentioned problems, and when removing the lid of the container molded by the sheet molding method from the opening of the container main body, hook the lower end of the side wall of the container lid with fingers and lift the top plate It is an object of the present invention to provide a container lid that can be used repeatedly even if it is removed while warping upward while the top plate portion of the container lid and the periphery of the top plate portion are not easily deformed.

The present invention relates to a sheet molding method using a raw sheet of 0.4 mm or less thick synthetic resin sheet having a disk-shaped top plate portion and a side wall portion extending from the outer periphery to the lower end of the top plate portion. The container lid is integrally formed by the above-described method, and a buffer portion having a substantially M-shaped cross section is formed at the boundary where the top plate portion and the side wall portion intersect, and is recessed inward in the vicinity of the middle of the side wall portion. A plurality of first rib portions are provided, and a cylindrical second side wall portion having an outer diameter larger than an outer diameter of the upper end of the side wall portion is formed on the side wall portion on the lower end side of the first rib portion, A cylindrical third side wall portion larger than the outer diameter of the second side wall portion is provided on the lower end side of the second side wall portion, and a lid flange portion that extends in the horizontal direction from the lower end of the third side wall portion is formed. The container lid.

In the present invention, the buffer portion is a container lid having a substantially bellows function formed by at least two or more mountain folds and one or more valley folds.

The present invention is a container lid in which a plurality of second rib portions projecting further outward than the second side wall portion are formed on the second side wall portion.

The present invention is the container lid, wherein the ratio of the diameter and height of the container lid is 100 to 14 or less.

In the present invention, the first rib portion is a container lid in which ribs recessed inward toward the central axis of the top plate portion are evenly arranged so as to be substantially wave-like around the circumference of the side wall portion.

  The present invention is the container lid in which the lower ends of the first rib portions come into contact with the buffer portion of the lower container lid when the lids of the plurality of containers are stacked upward.

  The present invention is the container lid in which the lower end of the second side wall portion abuts the lower end of the first rib portion of the lower container lid when the lids of the plurality of containers are stacked upward.

The present invention is a container lid in which a substantially wave-shaped corrugated portion is formed on the lid flange portion in the vertical direction.

The present invention is a container lid that covers a container sealed with a sheet material on a flange portion of the container.

The present invention relates to a sheet molding method using a raw sheet of 0.4 mm or less thick synthetic resin sheet having a disk-shaped top plate portion and a side wall portion extending from the outer periphery to the lower end of the top plate portion. The container lid is integrally formed by the above-described method, and a buffer portion having a substantially M-shaped cross section is formed at the boundary where the top plate portion and the side wall portion intersect, and is recessed inward in the vicinity of the middle of the side wall portion. A plurality of first rib portions are provided, and a cylindrical second side wall portion having an outer diameter larger than an outer diameter of the upper end of the side wall portion is formed on the side wall portion on the lower end side of the first rib portion, A cylindrical third side wall portion larger than the outer diameter of the second side wall portion is provided on the lower end side of the second side wall portion, and a lid flange portion that extends in the horizontal direction from the lower end of the third side wall portion is formed. When removing the container lid from the opening of the container, the side wall of the container lid with fingers Even if you try to remove it while hooking the lower end and lifting the top plate part upward, the step provided on the periphery of the top plate part will act as a cushion even if deformation due to bending is added The step part provided at the periphery of the step moves while it is recessed, absorbs the bending force, and when it is returned to its original state, the step part of the step part returns to its original state. It is difficult to provide a container lid that can be used repeatedly.

The present invention, the buffer portion is a container lid having a substantially bellows function formed by at least two or more mountain folds and one or more valley folds, when removing the container lid from the opening of the container, The step part having a substantially bellows function provided at the periphery of the top plate part, when hooking the lower end of the side wall part of the lid of the container with fingers and trying to remove it while lifting the top plate part upward, Even if deformation due to bending is applied, it acts as a cushion, and absorbs the bending force as the bending or bellows bellows of the stepped portion provided at the periphery moves. After opening, the lid of the container has a force to return the valley or mountain fold of the step part to its original state, so the lid of the container is not easily deformed, for example, a thin sheet material with a synthetic resin material raw material of 0.4 mm or less Even if it is the lid | cover of the container shape | molded by (1), the lid | cover of the container which can be used repeatedly can be provided.

Since the present invention is a container lid in which a plurality of second rib portions projecting further outward from the second side wall portion are formed on the second side wall portion, when the container lids are stacked, In the side wall portion, the lower end inside the third side wall portion and the upper end outside the second rib portion of the lower container lid come into contact with each other to stabilize the stacking of the container lids. There is a gap between the inside of the part and the outside of the second side wall part of the container lid below, and air enters and exits through this gap, so that pressure reduction and static electricity retention between the stacked container lids can be prevented. Therefore, it is possible to provide a container lid that can reliably take out the container lids one after another in order from the top.

The present invention is a container lid in which the ratio of the diameter and height of the lid of the container is 100 to 14 or less, and can reduce the raw material of the synthetic resin material to be used. A lid can be provided.

In the present invention, the first rib portion is a container lid in which ribs that are recessed inwardly toward the central axis of the top plate portion are uniformly arranged so as to be substantially wave-shaped around the circumference of the side wall portion. When the bottom of the side wall of the container lid is caught and the top plate is lifted and bent upward, the ribs recessed in a semi-cylindrical shape serve as pillars, and the torsion applied to the side wall The deformation of the side wall portion due to force can be suppressed.

According to the present invention, when the lids of a plurality of containers are stacked upward, the lower end of the first rib portion is a container lid that comes into contact with the buffer portion of the lower container lid. A part of the lower end of the undulating first rib portion is in contact with the stepped portion, so that a container lid with high stability in stacking the container lids can be provided.

The present invention is a container lid in which the lower end of the second side wall portion is in contact with the lower end of the first rib portion of the lower container lid when the lids of the plurality of containers are stacked upward. Stackability when the lids of a plurality of containers are sequentially stacked upward can be stabilized. In addition, the meaning of the stackability of the container lid according to the present invention means that when the container lid is sequentially stacked upward, it can be stably stacked upward in units of several tens to hundreds without collapsing. .

Since the present invention is a container lid in which a substantially wave-shaped corrugated portion is formed in the top and bottom of the lid flange portion,
When removing the lid of the container from the container, even if the finger is caught on the lid flange part and opened, the end surface of the peripheral edge of the flange part forms a corrugated shape, so there is no fear of damaging the finger.

Since the present invention is a container lid that covers a container sealed with a sheet material on the flange part of the container, the quality of the contents contained in the container is maintained, or the container tilts or falls during transportation. In this case, the container lid can be placed on the container B which prevents the contents from leaking out.

It is sectional drawing which fitted the lid | cover of the container of embodiment of this invention to the container. It is a front view of the lid of the container of the embodiment. It is a perspective view of the lid of the container of the embodiment. It is the perspective view which turned the cover of the container of the embodiment inside out. It is sectional drawing to which D section of FIG. 1 was expanded. It is sectional drawing which shows the state which pulled up the cover flange part of FIG. 5 to the outward direction. It is sectional drawing which shows the different deformation | transformation state of the cover body flange part of FIG. It is sectional drawing to which the E section of FIG. 1 was expanded. FIG. 9 is a cross-sectional view cut in the direction a to a ′ in FIG. 8. FIG. 9 is a cross-sectional view cut from b to b ′ in FIG. 8. It is the top view which turned the lid of the container of the embodiment upside down. It is the enlarged view to which F part of FIG. 11 was expanded. It is the enlarged view cut in c 'direction of c of FIG. It is the enlarged view cut in d to d 'direction of FIG. FIG. 8 is a cross-sectional view showing a state where the cross-sectional shapes of FIG. 7 are stacked. It is sectional drawing which shows the state in which the cross-sectional shapes of FIG. 8 were piled up. It is sectional drawing which shows the state which FIG. 7 and FIG. 8 accumulated. It is sectional drawing which shows the example of a different stacking of FIG. It is sectional drawing to which the different 2nd buffer part shape was expanded. It is sectional drawing to which the different 3rd buffer part shape was expanded. It is the figure which showed the measurement location of the thickness of the top-plate part of the lid | cover of the container of this invention. It is the figure which showed the measurement location of the thickness of the side wall part of the lid | cover of the container of this invention.

As shown in FIGS. 1 to 4, the container lid A of the present invention is a container lid A that covers a container B formed of a material such as plastic or paper having a flange portion B1 projecting outwardly. The container lid A is formed so that the ratio of the diameter x to the height y is 100 to 14 or less. As shown in FIG. 1 or FIG. 5, since the sheet material C such as an aluminum material or a resin material is bonded to the flange portion B1 of the opening of the container B, the flange portion B1 This is a container lid A for covering the container B that prevents the contents from leaking out when the quality of the contained contents is maintained or when the container B is tilted or falls during transportation. . Further, the lid A of the container of the present invention has a disk-shaped top plate portion 1 and a wall thickness portion A-PET of 0.40 mm or less having a side wall portion 2 extending from the outer periphery to the lower end of the top plate portion 1. It is a lid A for a container that is integrally molded by a sheet molding method using a raw material of a synthetic resin sheet such as polystyrene.

FIG. 5 is an enlarged cross-sectional view of a portion D of FIG. 1. As shown in FIG. 5, two or more mountain folds 3 a and one mountain fold 3 a are formed at the boundary where the top plate portion 1 and the side wall portion 2 intersect. The buffer part 3 having a substantially M-shaped cross section having the bellows function constituted by the valley fold 3b described above is formed. When removing the lid A of the container from the container B, as shown in FIG. 6 or FIG. 7, the buffer part 3 has the function of a cushion when the buffer part 3 having the bellows function is opened when it is lifted upward. Become. That is, since the buffer portion 3 provided between the top plate portion 1 and the side wall portion 2 has a structure capable of contracting and expanding, the opening / closing operation is repeated by the play that can be expanded and contracted. However, it is possible to provide the lid A of the container that is hard to deform due to the force that the buffer portion 3 returns to its original state. As shown in FIG. 3, the buffer portion 3 is more effective when it is formed to communicate with the entire periphery of the periphery where the top plate portion 1 and the side wall portion 2 intersect.

Next, as shown in FIG. 5, when the container B and the lid A of the container are fitted to the side wall part 2, a part of the side wall part 2 is inserted toward the lower end side of the flange part B1. A plurality of first rib portions 4 recessed inward are formed. The flange B1 is in contact with the inner surface near the upper end of the first rib portion 4 and a part of the inner surface of the side wall 2 so that the container B and the lid A of the container are fitted together. Yes.

FIG. 11 shows a state in which the lid A of the container is turned upside down. As shown in FIG. 11, the first rib portion 4 has a rib recessed toward the central axis of the top plate portion 1. A plurality of them are equally arranged on the circumference of the side wall 2 so as to be wavy. FIG. 8 is an enlarged view of an E portion of FIG. 2, and FIG. 9 shows a state cut from a to a 'in FIG. As shown in FIG. 8 or FIG. 9, due to the depression of the first rib portion 4, a plurality of substantially semi-cylindrical column portions 5 are formed on the adjacent side wall portions 2 of the first rib portion 4. It is formed. Therefore, the plurality of pillars 5 serve as pillars, the impact of the force applied from the outside to the side of the side wall 2, the impact of the force pressed from the top plate 1, or the opening It is possible to provide a lid A for a container that is not easily deformed by a twisting force applied to the side wall portion 2 due to warping of the top plate portion 1.

Furthermore, as the number of the first rib portions 4 and the column portions 5 formed alternately on the side wall portion 2 so as to form a wave shape is increased, the side wall portion 2 can be strengthened. Therefore, if the corrugated width of the first rib portion 4 and the column portion 5 is formed so as to wave each less than 5 mm, a stronger side wall portion 2 can be provided.

As shown in FIG. 5, when the side wall 2 on the surface that comes into contact with the flange B1 is the first side wall 2 a, the side wall 2 on the lower end 4 a side of the first rib 4 is A second side wall portion 2b having an outer diameter larger than the outer diameter of the first side wall portion 2a is formed. Furthermore, a third side wall 2c having an outer diameter larger than the outer diameter of the second side wall 2b is provided on the lower end side of the second side wall 2b. The third side wall portion 2c has a structure in which the outer diameter of the lower end of the third side wall portion 2c is formed larger than the outer diameter of the upper end of the third side wall portion 2c, so that the third side wall portion 2c can be easily fitted when set in the opening of the container. have.

Further, as shown in FIG. 5, a lid flange portion 7 extending outward in the horizontal direction is formed at the lower end of the third side wall portion 2c. As shown in FIG. 3 or FIG. 8, the end of the lid flange 7 has an upper and lower side when viewed from the side, so as not to damage fingers. A corrugated portion 7a undulating in the direction is formed. As a result, even if a finger or the like is rubbed against the end surface, the end surface is not a parallel straight surface, but is a wavy curved surface. There is no worry about it. The corrugated shape of the corrugated portion 7a is not limited to the arc-shaped corrugation, and the same effect can be obtained by forming a corrugated shape such as a quadrangle or a triangle, or a combination of these shapes. What you have can be provided.

FIG. 10 is a diagram showing a cut state from b to b ′ in FIG. 8, but as shown in the cross-sectional view of FIG. 10, the peripheral wall of the second side wall portion 2 b is closer than the second side wall portion 2 b. The second rib portion 6 protruding outward is formed so as to protrude evenly on the peripheral wall surface.

Next, FIG. 12 is an enlarged view of an F portion of FIG. 11, and FIG. 13 shows a state cut from c to c ′ in FIG. FIG. 14 shows a state cut from d to d ′ in FIG. Further, FIGS. 15 to 18 show a state in which the lids A of a plurality of containers are stacked in order upward.

FIG. 15 is a cross-sectional view showing a stacked state in which the cut positions in FIG. 13 are stacked. As shown in FIG. 15, the first rib portion 4 of the lid A of the container installed on the upper side is shown in FIG. The buffer part 3 of the lid A of the installed container contacts the lower end 4a and the lower side. Moreover, the lower end 6a of the second rib part 6 of the lid A of the container installed on the upper side and the lower end 4a of the first rib part 4 of the lid A of the container installed on the lower side make contact very stable. It is also effective for stacking several tens to 100 sheets.

Furthermore, when the lids A of the containers are stacked, for example, the lid A of the container that is flexible due to the thin-walled shape is exposed to the space in which the lids A of the containers overlap with each other by the pressure pressed from above. The air cannot be taken in and the pressure is reduced. For this reason, static electricity is generated by friction such as vibration during transportation, and the lid A of the container sticks to each other. However, as shown in FIG. 15, the container lid A according to the present invention is such that the side wall surfaces of the container lid A do not adhere to each other between the container lid A installed on the upper side and the container lid A installed on the lower side. The gap 8 is formed in the gap.

FIG. 16 is a cross-sectional view showing a stacked state in which the cut positions in FIG. 14 are stacked. As shown in FIG. 16, the lower end of the first side wall 2a of the container lid A installed on the upper side is in contact with the buffer part 3 of the container lid A installed on the lower side, and the upper part of the container lid A installed on the upper side. The lower end of the second side wall 2b and the lower end of the first side wall 2a of the lid A of the container installed on the lower side are not in contact with each other, and a gap 8 is formed. Therefore, air enters and exits from the gap 8 shown in FIG. 15 and the gap 8 shown in FIG. 16 to prevent pressure reduction and static electricity from being accumulated between the lids A of the stacked containers. The lid A of the container can be reliably taken out one by one.

Next, since the position where the lids A of the containers are overlapped is not always in the same direction, another overlapping state is shown in FIGS. 17 and 18 as an example. FIGS. 17 and 18 are cross-sectional views when the cut positions of FIG. 13 and the cuts of FIG. 14 are alternately placed on the upper side or the lower side and stacked. When the container lids A are stacked in the state shown in FIG. 17, the lower end of the first side wall 2a of the container lid A installed on the upper side and the buffer part 3 of the container lid A installed on the lower side are applied. Further, the lower end of the second side wall 2b of the lid A of the container installed on the upper side and the lower end 4a of the first rib 4 of the lid A of the container installed on the lower side are in contact with each other.

In the case of stacking the container lids A in the state shown in FIG. 18, the upper side of the first rib part 4 of the upper container lid A contacts the lower end 4 a and the buffer part 3 of the lower container lid A. A gap 8 is formed between the lid A of the installed container and the lid of the installed container on the lower side. Due to the alternately wavy shape of the first side wall 2a and the first rib 4, the gap 8 can be formed at any position so as to prevent depressurization and accumulation of static electricity. The lid A of the container can be taken out.

The 2nd buffer part 31 from which the lid | cover A of the container of this invention differs is shown in FIG. Moreover, the 3rd buffer part 32 from which the lid | cover A of the container of this invention differs is shown in FIG. As shown in FIG. 19 or FIG. 20, the cross-sectional shape of the buffer portions 31 and 32 has a bellows function by forming two or more mountain folds 3a and one or more valley folds 3b on the entire circumference. Even when the warping operation of the top plate portion 1 by the opening action is repeatedly performed, it is possible to provide the lid A of the container that is not easily deformed. In addition, the cross-sectional shape of the buffer parts 3, 31, and 32 is not limited only to the illustrated cross-sectional shape.

FIG. 21 or FIG. 22 shows the thickness of each part when the lid A of the container of the present invention is integrally formed by a sheet molding method using a raw material of a synthetic resin sheet of A-PET having a thickness of 0.3 mm. The thickness is measured using a dial caliper gauge. As shown in FIG. 21, when the thickness of the top plate portion 1 was measured, the thickness of the first measurement location e1 was 0.21 mm, and the second measurement location e2 was 0.29 mm. Further, as shown in FIG. 22, when the thickness of each part of the side wall portion 2 was measured, the thickness of the third measurement location was 0.16 mm, and the thickness of the fourth measurement location was 0.17 mm. The thickness of the measurement location was 0.16 mm, the thickness of the sixth measurement location was 0.23 mm, the thickness of the seventh measurement location was 0.24 mm, and the thickness of the eighth measurement location was 0.24 mm.

As described above, in the case of a container lid that does not form the buffer part 3, the first rib part 4, the second rib part 6 and the like formed by the container lid A of the present invention, only one opening operation is performed. However, the corner of the boundary between the top plate portion and the side wall portion is bent and is easily deformed. However, if the structure of the lid A of the container of the present invention is adopted, the shape configuration of the side wall portion 2 and the buffer having the bellows function Even if both functions of the part 3 work and the opening and closing operation is repeated, the force that the buffer part 3 returns to the original works, and the lid A of the container that is not easily deformed can be provided.

  Further, when the lid A of the container having flexibility due to the thin wall shape is stacked and transported, even if the lids A of adjacent containers collide with each other, the overlapping portions of the side wall portions 2 of the lids A of the containers overlap. Since the wall of the container is formed, it is possible to provide a container lid A that is highly resistant to external impacts and is unlikely to be deformed. Further, the storage space can be saved, and the cost of storage and transportation can be reduced. .

DESCRIPTION OF SYMBOLS 1 Top plate part 2 Side wall part 2a First side wall part 2b Second side wall part 2c Third side wall part 3 Buffer part 3a Mountain fold 3b Valley fold 4 First rib part 4a Lower end 5 Column part 6 Second rib part 6a Lower end
7 Lid flange part 7a Corrugated part 8 Crevice part A Container lid A1 Container lid A2 Container lid B Container B1 Flange C Sheet material x Container lid diameter y Container lid height z1 First measurement location z2 2nd measurement location z3 3rd measurement location z4 4th measurement location z5 5th measurement location z6 6th measurement location z7 7th measurement location z8 8th measurement location

Claims (9)

Using a raw material of a synthetic resin sheet having a thickness of 0.4 mm or less having a disc-shaped top plate portion and a side wall portion extending from the outer periphery to the lower end of the top plate portion, integral molding is performed by a sheet molding method. In the lid of the container, a buffer portion having a substantially M-shaped cross section is formed at the boundary where the top plate portion and the side wall portion intersect, and a plurality of first rib portions recessed inward in the middle of the side wall portion A cylindrical second side wall portion having an outer diameter larger than the outer diameter of the upper end of the side wall portion is formed on the side wall portion on the lower end side of the first rib portion, and the lower end side of the second side wall portion A cylindrical third side wall portion larger than the outer diameter of the second side wall portion is provided, and a lid flange portion that extends horizontally from the lower end of the third side wall portion to the outside is formed. Container lid. 2. The container lid according to claim 1, wherein the buffer portion has a substantially bellows function formed by at least two or more mountain folds and one or more valley folds. The container lid according to claim 1 or 2, wherein a plurality of second rib portions projecting further outward from the second side wall portion are formed on the second side wall portion. The container lid according to any one of claims 1 to 3, wherein a ratio of a diameter and a height of the container lid is 100 to 14 or less. The said 1st rib part arrange | positions the rib dented inward toward the center axis | shaft of a top-plate part equally so that it may become a wave shape substantially on the circumference of a side wall part. The container lid according to any one of the above. The lower end of said 1st rib part contact | abuts the buffer part of the cover of a lower container, when the lid | covers of several containers are piled up upwards, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. The container lid according to one item.   The lower end of the second side wall portion comes into contact with the lower end of the first rib portion of the lower lid of the container when the lids of the plurality of containers are stacked upward. The container lid according to claim 6. The container lid according to any one of claims 1 to 7, wherein the lid flange portion is formed with a substantially wavy corrugated portion in the vertical direction. The container lid according to any one of claims 1 to 8, wherein the container lid is a container lid that covers a container sealed with a sheet material on a flange portion of the container.