JP4555887B1 - Sheet molding die and punching mold and sheet molding container - Google Patents

Abstract

An object of the present invention is to provide a sheet-molded container with ears that is safe without causing injury to the hand at the periphery of the opening and is not easily damaged even when an external force is applied even when the thickness is reduced.
A container body or lid sheet-molding mold having a bulge on the outside of a peripheral wall and having the opening periphery folded back, and a fixed mold for molding the peripheral wall, and the fixed mold And a movable mold that forms an ear by moving up and down around the flange, and the movable mold includes a flange support portion that forms a horizontal flange that is continuous with the peripheral wall at the lowered position, and an upward movement. And a bulge portion support portion that folds the flange upward, and the bulge portion support portion has a concave molding surface capable of forming the bulge portion on the folded flange. The female blade of the fixed blade is formed with an ear insertion part having a shape corresponding to the concave molding surface of the movable mold in the mold on the lower inner periphery of the mouth edge.
[Selection] Figure 3

Description

  The present invention relates to a molding technique in which the peripheral edge of the opening of a container body and its lid is made into a safe shape and durability is provided even if it is thinned in the field of plastic sheet molding such as vacuum molding.

  In various fields including food containers, sheet molding containers are used in which a thin plastic sheet is vacuumed, compressed air, or vacuum-compressed using both in combination. Here, in food containers such as lunch boxes, side dishes, and instant foods that are most commonly seen, examples of containers with lids that attach a lid to the container body by external fitting include those shown in Patent Documents 1 to 8, for example. It is known. That is, the general configuration of the lidded container exemplified in Patent Documents 1 to 8 is an annular or arc-shaped protrusion that protrudes outwardly from the opening peripheral edge 71 of the container body 70 as shown in FIG. On the other hand, the lid 80 is provided with an engaging portion 82 that engages with the protruding portion 72 on a peripheral wall 81 that is formed to have an inner size that is elastically fitted to the opening peripheral edge 71 of the container body 70 from the outside. When the lid is closed, the engaging portion 82 elastically engages the projecting portion to prevent the lid 80 from falling off, while the peripheral wall 81 of the lid 80 is spread outward by a predetermined force or more. The lid is opened.

  For such food containers with lids, demand is increasing year by year due to changes in eating habits, the rise of convenience stores, and the like, and the distribution volume is enormous. For this reason, the issue for the manufacturer is how to reduce material costs, resource saving, and reduction of the burden on the global environment related to disposal. One of the solutions is to reduce the sheet thickness as much as possible (thinner thickness reduction). ) Has been made.

JP 2007-99288 A JP 2007-91240 A JP 2006-315719 A JP 2006-213373 A JP 2006-160349 A JP 2006-1582 A JP 2005-35613 A JP 2005-225500 A

  By the way, the above-mentioned container with a lid for food needs to expand and deform the lid 80 when the lid is opened. Are often formed). FIG. 6 shows a flared flange 83. The flange 83 is positively formed in a size (dimension) that can be easily caught by a finger. However, when punching with a conventional punching die, the connecting flange between adjacent containers is faithfully cut along the periphery of the opening. However, a flange of about 1 mm is unavoidably formed. Then, the tip of the flange 83 after punching forms an acute edge, and the tip becomes sharp like a blade as the thickness is reduced. Therefore, there is a risk that the consumer may injure the finger when opening the lid.

  Further, if the sheet thickness is simply reduced, the strength is naturally sacrificed, and the flange 83 may be damaged at the finger-hanging portion when the lid is opened, and the lid cannot be opened successfully. Prior to that, the flange 83 may be damaged due to contact between adjacent containers during display or boxing or vibration during transportation. Furthermore, in the case of products packed with contents at the factory, such as cup noodles and instant soup, they are ultimately shipped in a shrink pack with a plastic film, but the film presses the flange 83 during the shrink pack (packaging) ( And sometimes damaged. In this way, with the conventional configuration, the strength of the flange 83 decreases as the wall thickness is reduced, which is a cause of frequent breakage accidents. The sharp ear cracks increase the risk of injury to the consumer's fingers and tearing the shrink pack. For this reason, the products with cracked ears are subject to return, and the poor yield due to thinning is a problem for manufacturers.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to be safe without hurting a hand at the periphery of the opening even when the thickness is reduced, and to be damaged even if an external force is applied. It is to provide a sheet forming container with a hard ear.

  In order to achieve the above-described object, first, the sheet forming container of the present invention will be described. After forming an ear around the periphery of the opening during sheet forming, a container with an ear obtained by punching the periphery of the ear with a punching die. It is a main body or a lid, and the ear is formed by folding the peripheral edge of the opening to the outside of the peripheral wall, and a bulge that bulges outward from the tip between the folded base and the punched tip (ear edge). Has an exit. According to this container, pocket-shaped ears that bulge outward are formed on the periphery of the opening, and the maximum bulging portion of the bulging portion defines the outer dimension of the container. And since the tip punched out of the ear is located inside the bulging portion, the finger or the film of the shrink pack does not directly touch the tip. In addition, in this invention, when it only calls a container, it has the concept of both a container main body (so-called body) or a lid | cover. That is, the present invention can be applied to both a container body with ears or a lid with ears.

  When the present invention is applied to the lid of a container, when the consumer opens, the consumer hangs his fingers mainly on the folded base portion of the ear and pulls upward so that the peripheral wall is slightly expanded outward. Since it is a double structure that is folded back, it shows higher strength than a single sheet flange as in the prior art. In addition, since the folded base portion exhibits elasticity like a spring, the external force is elastically absorbed even when the ear is subjected not only upward (when opening the lid) but also inward (when shrink-packing). Avoid the ears being damaged.

  In particular, when the bulging portion of the ear is curved, the elasticity of the entire ear is increased. Further, in the case where the peripheral wall side of the container is provided with a bulging portion that curves inward symmetrically with the bulging portion of the ear, the peripheral bulging portion and the bulging portion of the ear are folded back. Thus, a substantially annular spring is formed, and external forces acting in all directions acting on the ear can be absorbed most effectively.

  Next, the sheet molding die of the present invention is the above-described sheet molding container, that is, the opening periphery is folded back to the outside of the peripheral wall, and bulges outward from the tip between the folded base and the punched tip. A mold for molding a container body with an ear having a bulging part or a lid for molding a sheet, and fixing a convex mold for molding a bottom wall of the container body or a top surface of the lid downward and a peripheral wall around the bottom of the opening Consists of a mold and a movable mold that moves up and down around the fixed mold, and the fixed mold is formed in a concave shape of the bulging portion that is continuously inwardly bound to the lower side of the molding surface of the peripheral wall. On the other hand, the movable mold forms a horizontally outward flange continuously with the bulging portion formed by the concave molding surface in the lowered position, and moves the flange downward as the ascending movement occurs. Flange support part on the upper surface side pushed up from the above, The Jo molding surface bulges outward symmetrically, and a bulging portion supporting portion of the inner surface for supporting the foldable said bulging portion molded with the concave molding surface when the upward movement.

  In the mold of the present invention, first, when the movable mold is in the lowered position, the main part such as the peripheral wall is formed on the bottom of the container body or the top surface of the lid and the periphery thereof as in the normal sheet forming method. At this time, it is continuously formed with the peripheral wall with the bulging portion bulging inward by the concave molding surface of the fixed mold. After this first stage molding, as the second stage molding, the flange is lowered by the flange support portion on the upper surface side by moving the movable mold while the sheet is softened or semi-cured before being fully cured. While being pushed up, the bulging portion is folded back to the outside of the peripheral wall with the bulging portion supporting portion on the inner surface side being turned back to the boundary with the peripheral wall.

  The bulging part is formed mainly by the concave molding surface of the fixed mold during the first stage molding, but the shape is adjusted by the bulging part supporting part of the movable mold even in the second stage molding. Furthermore, in the case where the peripheral wall molding surface of the fixed mold is provided with the second concave molding surface continuously above the bulging portion support portion, the folded base portion is symmetrically formed with the folded outward bulging portion. Thus, an inward bulging portion is also formed on the peripheral wall side, and the above-described substantially annular ear can be formed. In addition, a curved bulging part can be shape | molded by making these concave shaped surface (1st) and 2nd concave shaped surface into curved shape.

  The typical sheet forming methods to which this mold can be applied are the vacuum forming method, hot plate pressure forming method, pressure forming method, and vacuum pressure forming method. Any other sheet forming method can be adopted as long as the forming can be completed. However, the formation of the bulging portion is the final step of sheet forming, and at this time, it is also assumed that the sheet is in a semi-cured state. In addition, if the sheet thickness is reduced, molding can be done with a small pressure, but cooling and curing are also accelerated, so the molding method adopted depends on which one is emphasized, but in general, vacuum is performed at a high pressure. It is preferable to adopt a pressure forming method.

  Then, after the sheet is formed by the above-described mold of the present invention, as a punch for a sheet-molded container that cuts the flange between adjacent container bodies with lids or lids along the ears, in the present invention, the opening downwards A cylindrical or concave female blade with an upward opening into which the ear can be inserted inside an upper surface support portion that supports the flange of the sheet forming container to be conveyed from below, and a downward convex male with which the female blade can be fitted. The female blade uses a means in which the lip of the female blade protrudes inward so as to be able to enter the connecting corner portion of the ear and the flange after insertion.

  According to the punching die of the present invention, the male blade is inserted into the female blade by raising or lowering the female blade, and the plastic sheet is cut by shearing between the female blade lip and the male blade outer surface. The edge of the female blade is projected inward, and the male blade can be inserted in the state where it enters the sharp corner of the ear and flange. It can be. That is, it is possible to form a punching tip having an inner dimension smaller than the outer dimension of the bulging portion.

  In addition, the female blade is formed with an ear insertion portion having a shape corresponding to the concave molding surface of the movable mold in the lower inner periphery of the lip, so that the outer shape of the ear and the inner ear insertion portion of the female blade are formed. The shapes match and can be punched without deforming the bulges of the ears during punching. In particular, when the ear insertion portion has a curved shape with a diameter reduced toward the lip, it corresponds to an ear having a curved bulge portion. More preferably, the male blade protrudes downward to the inside of the blade edge, is inserted into the ear (between the bulging portion and the peripheral wall), and is provided with a guide capable of deforming the peripheral wall in the ear inward from the inside during punching. . According to this means, when the guide is punched, the peripheral wall in the ear is temporarily deformed inward, so that the ear can be more reliably cut along the connecting corner of the flange, and the cut surface is substantially perpendicular to the flange. Thus, the tip of the ear does not form a sharp edge.

  According to the sheet forming container with an ear of the present invention, the bulging part of the ear constitutes the outer dimension of the container, and the tip of the ear punched out by the punching die is inside the bulging part. It is safe without touching the tip. In addition, when the shrink pack is applied, the film does not touch the tip, and there is no fear of inadvertent film tearing. Furthermore, since the ear has elasticity, even if a vertical or left and right pressing force is applied, the ear is absorbed by the bulging portion or the folded base portion to prevent the ear from being damaged.

  Thus, even if the sheet forming container of the present invention is made thin, the damage of the ear is prevented by the elastic force, so that the plastic sheet to be used can be made extremely thin. For example, a conventional container with an ear having a thickness of 60 to 80% can be provided. For this reason, material cost is greatly reduced, and it contributes greatly to resource saving and reduction of burden on the global environment. Moreover, since the cooling time after sheet forming is shortened due to the thinning, the entire forming time is also shortened, and the consumption of the cutting die blade is greatly improved.

  On the other hand, according to the sheet molding die of the present invention, the container of the present invention with ears described above can be molded. In addition, the existing molding method can be used without changing the molding method, and only a movable die is added. Therefore, it is not necessary to significantly change the molding apparatus.

  Furthermore, according to the punching die of the present invention, when used in combination with the above-described sheet molding die of the present invention, the container is flanged with the tip of the ear positioned more securely than the bulging portion. Can be separated from.

Schematic showing an embodiment of a lid with ears Schematic showing the shipping state after shrink-packing the entire container with a lid with ears Schematic showing an embodiment of a mold for sheet forming containers Schematic showing another embodiment of the mold Schematic showing an embodiment of a punching die for a sheet forming container Schematic showing another embodiment of the punching die Schematic showing yet another embodiment of the punching die Schematic showing a conventional sheet molding container with ears

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, FIG. 1 shows a container with ears in which the present invention is applied to a lid, and an ear 3 is provided at the lower end of a stepped peripheral wall 2 extending continuously downward around the top surface 1, that is, at the periphery of the opening. Is formed. The ear 3 has a lower end (periphery of the opening) of the peripheral wall 2 folded upward, and a curved bulge that bulges outward from the tip 3a between the tip 3a and the folded base 3b. 3c. In other words, the tip 3a of the ear 3 is located on the inner side closer to the peripheral wall 2 than the bulging portion 3c.

  In this embodiment, an outwardly curled portion 4a is formed on the upper edge of the opening of the container body 4 containing instant noodles or the like, and a lid that is detachably fitted to the container body 4 is illustrated. That is, an engagement groove 2a that is elastically engaged with the curled portion 4a is formed in the peripheral wall 2 of the lid, and an ear 3 is formed below the engagement groove 2a.

  Therefore, the lid of this embodiment is removed from the container main body 4 by elastically expanding the peripheral wall 2, but at this time, the ear 3 functions as a finger hook. The ear 3 absorbs the force pushed upward (obliquely) by the finger by the elasticity of the folded base 3b, and prevents the ear 3 from being damaged when the lid is opened.

  Further, at the time of product shipment, as shown in FIG. 2, the whole is shrink-packed by the plastic film 5 and the ear 3 is pressed inward. This compression force is the elasticity of the folded base 3b and the bulging portion 3c. Since it is absorbed by force, the ear 3 is not broken or damaged. Furthermore, since the tip 3a of the ear is located on the inner side (near the peripheral wall 2) than the bulging portion 3c as described above, the plastic film 5 does not contact the tip 3a, and the plastic film 5 is prevented from being broken by the tip 3a. Is done.

  Furthermore, in this embodiment, in order to further increase the elasticity of the ear 3, an inward bulging portion 2b is also formed on the peripheral wall 2. The peripheral wall side bulging portion 2 b is formed in a position and shape symmetrical to the bulging portion 3 c of the ear 3. For this reason, since the cross-section of the ear 3 is substantially circular as a whole, it effectively absorbs the pressing force from all directions in the vertical and horizontal directions.

  As described above, the lid (sheet molding container) of the present embodiment can avoid the cracking of the ears 3 by absorbing the external force by the elastic force of the ears 3, so that the lid 3 can prevent the cracking of the ears using a thick sheet. However, the sheet thickness can be reduced by about 20 to 40%.

  The shape of the bulging portion 3c is preferably a curved shape in order to soften the contact with a finger or a film of a shrink pack, but may be a curved shape, and a sharp ear tip 3a is on the inside. Any other shape may be used as long as it has such a shape. Moreover, although it is preferable to provide the inward bulging part 2b also in the surrounding wall 2, it is also possible to abbreviate | omit and to shape | mold this part straightly. Furthermore, in the above embodiment, the application to the lid is exemplified, but it is also within the scope of the present invention to provide a similar ear around the opening periphery of the container body.

  Next, the metal mold | die which shape | molds the said lid | cover with an ear | edge is demonstrated. FIG. 3 shows a molding process using the mold. 10 is a fixed mold for molding the peripheral wall 2 of the lid, and 11 is a movable mold for moving the periphery of the fixed mold 10 up and down to mold the ear 3. It is a mold. The fixed mold 10 is a convex mold that has a side wall as a peripheral wall molding surface 10a and molds the container in a state where the opening faces downward. Further, the peripheral wall molding surface 10a of the fixed mold 10 has a bulging portion that is constricted inwardly symmetrically with the curved molding surface 11c at a portion facing the curved molding surface 11c at the raised position of the movable mold 11. The concave molding surface 10b is provided. On the other hand, the movable mold 11 moves up and down between the lowered position in FIG. 3A and the raised position in FIG. 3B. At the lowered position, the flange 20 is horizontally outward and continuous with the peripheral wall 2. And a bulge portion support portion 11b that folds up the bulge portion formed by the concave molding surface 10b as it moves upward. Among these, the bulging portion support portion 11b is configured with a curved molding surface 11c that is bent outwardly (left side in the drawing) directly below the flange support portion 11a. Furthermore, in this embodiment, the annular ear shown in FIG. 1 is formed on the peripheral wall molding surface 10a of the fixed mold 10 by forming the second concave molding surface 10c continuously above the concave molding surface 10b. Although it can be formed, it is a preferable configuration, but the second concave molding surface 10c is an optional configuration that can be omitted.

  According to the mold, in the first stage molding state in which the movable mold 11 is first lowered (FIG. 3A), both molds 10 are heated by softening the heated and softened plastic sheet by vacuum, compressed air, or vacuum compressed air. When the peripheral wall 2 is formed by the fixed mold 10, the ear-side bulge is formed by the concave molding surface 10 b, and the flange support part 11 a of the movable mold 11 is used. A horizontal flange 20 is formed continuously with the bulging portion. Also, at this time, the second concave molding surface curved molding surface 10c of the fixed mold 10 is molded in a state in which a portion that later becomes a bulging portion on the peripheral wall side bulges inward.

  Next, as the second stage molding, the movable mold 11 is raised while the plastic sheet is softened or in a semi-cured state, so that the flange 20 is surrounded by the bulging portion support portion 11 b of the movable mold 11. The ear 3 is formed by accurately molding the bulging portion 3c that is folded back outwardly and bulges outwardly by the curved molding surface 11c.

  After the second stage molding, the movable mold 11 is returned to the lowered position again to release the molded sheet, and the horizontal flange 20 remaining around the ear 3 is cut along the ear 3 by punching in the next process. Thus, it is possible to obtain the lid with the ear shown in FIG. 1 in which the cut surface, that is, the tip 3a of the ear 3 is positioned inward of the peripheral wall 2 with respect to the bulging portion 3c.

  FIG. 4 shows a mold according to another embodiment. The mold according to another embodiment is a concave mold that is composed of only the fixed mold 30 and has a concave peripheral wall forming surface 31 for forming the peripheral wall 2 at the center thereof. Then, around the peripheral wall molding surface 31, there is provided a convex molding portion 32 that projects a predetermined height for molding the ear 3. The convex molding part 32 constitutes a curved molding surface 32a whose outer surface side (left side in the drawing) swells outward. In this embodiment, a curved molding surface 32b that swells inward is also formed on the inner surface side of the convex molding portion 32, but this molding surface 32b is an optional item that can be omitted.

  And according to the metal mold | die of another embodiment shown in FIG. 4, shaping | molding of the container (lid) with an ear | edge as shown in FIG. 1 is completed only by making the softened plastic sheet closely_contact | adhere to a metal mold | die. Therefore, it is more advantageous than the convex mold of FIG. 3 provided with the movable mold 11 described above from the viewpoint that the mold structure and molding are simple. On the other hand, in the mold according to another embodiment, the convex molding portion 32 constitutes an undercut, and is forcedly removed at the time of mold release. Therefore, from the viewpoint of molding accuracy of the ear 3 and ease of mold release, FIG. The convex mold is advantageous.

  In the embodiment of the mold, it has been described that the lid is molded. However, although the lid and the container body have different peripheral wall heights and opening diameters, the present invention is not limited to these details, and the peripheral edge of the opening. Therefore, the container with the ears can be formed using the mold having the same configuration as that of the above embodiment for the container body.

  However, no matter which mold is used, it is necessary to accurately cut the connecting corner portion 21 of the molded ear 3 and the flange 20. This is because, if the middle of the flange 20 is cut, the cut surface is outside the bulging portion 3c, and there is a possibility that the ear-equipped container of FIG. 1 cannot be obtained.

  Then, subsequently, an embodiment of a punching die capable of accurately cutting the connecting corner portion 21 of the ear 3 after molding and the flange 20 is shown in FIG. In FIG. 5, 50 is a fixed blade and 60 is a movable blade. The fixed blade 50 is provided with a female blade 52 inside an upper surface support portion 51 that supports the flange 20 of the sheet-forming container conveyed downward from the opening from below. The female blade 52 has a hollow shape for dropping the punched container downward, and its lip 53 functions as a cutting edge.

  On the other hand, the movable blade 60 includes a male blade 61 that moves up and down so as to be fitted into the female blade 52 of the fixed blade 50. Further, the inside of the male blade 61 is a relief recess 62 having the same shape as the top surface 1 and the peripheral wall 2 of the sheet forming container.

  Here, the female blade 52 of the fixed blade 50 of the present invention will be described in more detail. The female blade 52 has a shape and a diameter into which the ear 3 of the sheet forming container can be inserted, and the lip 53 is a female blade. In the state where the ear 3 is inserted into 52, it protrudes inward so that it can enter the connecting corner 21 with the flange 20. More specifically, in the case of the present embodiment, an outwardly curved ear insertion portion 54 corresponding to the curved molding surface 11c of the movable mold 11 in the above-described mold is provided on the inner peripheral surface immediately below the lip 53. Provided. The ear insertion portion 54 is reduced in diameter toward the lip 53.

  According to the punching die having this configuration, when the movable blade 60 is lowered to perform punching, the curved ear insertion provided in the female blade 52 of the fixed blade 50 by the ear 3 of the sheet forming container conveyed downward in the opening is provided. The portion 54 is inserted and held in an undeformed state. Since the inner diameter of the lip 53 is smaller than the outer diameter (outer dimension of the container) of the bulging portion 3 c in the ear 3, the bulging portion 3 c faces inward when the ear 3 passes through the lip 53. This deformation is absorbed by the elastic force of the ear 3, and after passing, it is elastically restored to its original shape and held in the ear insertion portion 54 in an undeformed state as described above. In the state where the ear 3 is inserted, the lip 53 of the female blade 52 is positioned at the connecting corner portion 21 between the ear 3 and the flange 20, and the movable blade 60 is lowered straight, thereby the connecting angle. The part 21 can be cut accurately. In this way, the connecting corner portion 21 is accurately cut by the main punching die, so that the cut surface, that is, the tip 3a of the ear 3 is inwardly facing the peripheral wall 2 from the bulging portion 3c, as shown in FIG. A positioned lid with ears can be obtained.

  In addition, the inner surface shape of the ear insertion portion 53 matches the shape of the curved molding surface 11c of the movable mold 11 as described above, in other words, the shape of the bulging portion 3c of the ear 3, and this compresses the ear 3. The connecting corner portion 21 with the flange 20 is accurately cut in an undeformed state. Therefore, the inner surface shape of the ear insertion portion 53 in the punching die is not limited to the present embodiment. For example, when a bulge-shaped bulge is formed on the ear 3, a cuboid shape is correspondingly formed. It can be an ear insertion part. In the above-described embodiment, the male blade side 51 is movable and the female blade 52 side is fixed. However, the male blade side may be fixed and the female blade side may be movable up and down.

  By the way, when constructing a safer ear, it is preferable that the cut surface of the tip of the ear is a right angle. In this regard, since the punching die of the above embodiment is for punching the ear in an undeformed state, if the connecting corner portion 21 with the flange 20 is faithfully cut, the cut surface becomes less than 90 degrees, that is, an acute angle. There is. Of course, if the flange 20 is cut slightly outside the connecting corner portion 21, the tip on the ear side becomes a substantially perpendicular cut surface. In this case, if the outer dimension of the bulging portion is not set large, the tip of the ear swells. Since it is no longer located inside the protruding portion, the outside size of the container increases.

  Therefore, another embodiment of a punching die that does not have such inconvenience and can provide a safe ear is shown in FIG. In the punching die shown in FIG. 6, the male blade 40 is provided with a guide 42 that protrudes downward inside the blade edge 41. The female blade is the same as that of FIG. The guide 42 of the male blade 40 is inserted into the inside of the ear 3, that is, between the bulging portion and the peripheral wall, and deforms the peripheral wall in the ear inward from the inside when punching. That is, by lowering the guide 42, an inward force is applied to the inner surface of the peripheral wall side bulging portion of the ear that is bound inwardly at the tip thereof. As a result, the ear 3 bulges on the ear side so that the fold base is located immediately below the tip of the guide 42 as the peripheral wall bulge is deformed. As a result, the bulging portion on the ear side and the connecting corner portion 21 of the flange 20 change from an acute angle state (undercut state) to a substantially right angle state, and in this state, by inserting the male blade 40 into the female blade. The tip cutting surface of the ear 3 can be made approximately 90 degrees with respect to the flange 20.

  FIG. 7 shows a punching die according to another embodiment, in which the shape of the lip 46 of the female die 45 is changed while employing the male die of FIG. In other words, the mouth edge 46 of the female mold 45 in this embodiment is not the inner flare-like mouth edge shown in FIGS. 5 and 6, but a thick cylindrical shape having the same inner diameter within a certain range in a portion functioning as a blade. It is said. Therefore, the durability of the blade can be improved as compared with the female blade of FIGS.

DESCRIPTION OF SYMBOLS 1 Top surface of lid 2 Peripheral wall 3 Lid ear 3a Ear tip 3b Ear fold base 3c Ear bulge 4 Container body 10 Fixed mold 10a Perimeter wall molding surface 11 Movable mold 11a Flange support 11b Swell Part support part 11c Concave molding surface 20 Horizontal flange 21 Flange 50 Fixed blade 51 Upper surface support part 52 Female blade 53 Edge 60 Movable blade 61 Male blade 62 Recessed recess

Claims (10)

  Mold for molding sheet body of container body or lid with ears having a bulging portion that bulges the outer periphery of the opening to the outside of the peripheral wall and bulges outward from the tip between the folded base and the punched tip The bottom of the container body or the top surface of the lid downward and the convex fixed mold that molds a peripheral wall around the opening, and a movable mold that moves up and down around the fixed mold, While the fixed mold has a concave molding surface of the bulging portion continuously inwardly below the peripheral wall molding surface, the movable mold is molded with the concave molding surface in the lowered position. In addition, a flange that is horizontally outward is formed continuously with the bulging portion, and the flange support portion on the upper surface side that pushes up the flange from below as it moves upward, and the concave molding surface are symmetrically outward. Indented molding when bulging and moving up In formed sheet molding die, which is characterized in that it comprises a bulging portion supporting portion of the inner surface side can be supported folding the bulged portion.   The molding die for a sheet molding container according to claim 1, wherein the concave molding surface is curved.   The sheet molding die according to claim 2, wherein a second concave molding surface is provided on the peripheral wall molding surface of the fixed die continuously above the concave molding surface.   A sheet-molding container die for cutting a flange between a container body with an adjacent ear or a lid along the ear after sheet forming by the mold according to any one of claims 1 to 3. A female blade having an upward opening in which the ear can be inserted inside an upper surface support portion that supports the flange of the sheet forming container conveyed downward from the opening, and a male blade capable of being inserted into the female blade. The female blade protrudes inwardly so that the lip of the female blade can enter the connecting corner between the ear and the flange after insertion.   The punch of the sheet-forming container according to claim 4, wherein the female blade is formed with an ear insertion portion having a shape corresponding to the bulging portion of the ear on the lower inner periphery of the lip.   The punching die for a sheet forming container according to claim 5, wherein the ear insertion portion has a curved shape with a diameter reduced toward the mouth edge.   The punching die for a sheet molding container according to claim 4, 5 or 6, wherein the male blade has a guide that protrudes inwardly and is inserted into the ear and is capable of deforming the peripheral wall in the ear inward during punching. An engagement groove is formed on the peripheral wall, and a bulging portion is formed on the outer periphery of the opening so as to be outside the peripheral wall and to return to the outer surface of the peripheral wall, and to bulge outward between the folded base and the outer tip. A container body or lid with ears formed by cutting the outer tip after forming the ears while the plastic sheet is softened or semi-cured.   The sheet forming container according to claim 8, wherein the bulging portion is curved.   The sheet forming container according to claim 9, further comprising a bulging portion curved inward at a position symmetrical to the bulging portion of the ear on the peripheral wall.

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