JP2006001569A - Container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight container in which reduction of the pressure losses of a resin during the molding is suppressed, and a bottom part is made thin-walled. <P>SOLUTION: The container has a cylindrical peripheral wall 1 and a bottom part 2 to close an opening on one end side of the peripheral wall 1, and the peripheral wall 1 and the bottom part 2 are molded by injecting a resin from a predetermined position P of the bottom part 2 during the molding. A peripheral projecting bar 20 extending in the peripheral direction and a plurality of radial projecting bars 22 with a predetermined interval in the peripheral direction while one end thereof is connected to the peripheral projecting bar 20 and the other end side extends toward the peripheral wall 1 are projected from at least any one of an outer face and an inner face of the peripheral wall 1, and the peripheral projecting bar 20 and the radial projecting bars 22 are integrated with the bottom part 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a container that accommodates an object to be accommodated, and more particularly, to a container that includes a cylindrical peripheral wall and a bottom that closes one end opening of the peripheral wall, and these are integrally formed by injection molding.

  2. Description of the Related Art Conventionally, as a container for containing objects (for example, foods such as soup and miso soup, beverages such as coffee and juice), a cylindrical peripheral wall and a bottom portion that closes an opening on one end side of the peripheral wall are provided. Things are well known. Such containers are manufactured by various manufacturing methods, and one of them is one in which a peripheral wall and a bottom are integrally formed by injection molding a polypropylene resin.

  When such a container is molded by injection molding, resin is injected from the bottom of the container, and the resin flows to the downstream side, whereby the bottom and the peripheral wall are integrally molded. Specifically, in forming the container, a cavity (concave) for forming the outer surface of the container and a core (convex) for forming the inner surface of the container are used. The cavity and the core are combined to form a cylindrical space that forms the peripheral wall (hereinafter referred to as a peripheral wall forming space) by a gap formed between the inner surface of the cavity and the outer surface of the core, and the peripheral wall portion A flat plate-shaped space (hereinafter referred to as a bottom molding space) that communicates with one end of the molding space and forms the bottom portion is formed.

  The cavity is formed with an injection port for injecting resin. The injection port is disposed at a position where the resin flows evenly. In the case of such a container, the injection port is formed at a substantially central portion (a position corresponding to a substantially central portion of the bottom portion) in the bottom molding space that is the center of the container. ing. Accordingly, when the resin is injected from the injection port, the resin flows so as to spread in the radial direction from the center of the bottom molding space, and then flows into the peripheral wall molding space, and the container having the above-described configuration is molded.

  In recent years, there has been a demand for weight reduction of containers. As its measure, it is conceivable to make the peripheral wall and the bottom thinner than the conventional one, but when the bottom is made thin like this, since the bottom molding space is formed with a narrow gap, molding In some cases, the resin could not flow uniformly over the entire area of the bottom molding space and the peripheral wall molding space, and there was a limit to reducing the weight of the container. That is, when a container is molded by injection molding, if the bottom molding space is made too narrow, a large pressure loss will occur on the upstream side of the resin flow path. Therefore, the bottom molding space and the bottom molding space are downstream. There is a problem that it becomes impossible to fill the resin in the molding space of the peripheral wall part on the side, and there was a limit to forming the bottom of the container thinly

  Therefore, in view of such circumstances, an object of the present invention is to provide a container that is reduced in weight by suppressing a decrease in pressure loss of a resin during molding and forming a thin bottom portion.

  A container according to the present invention includes a cylindrical peripheral wall and a bottom portion that closes an opening on one end side of the peripheral wall, and the peripheral wall and the bottom portion are molded by injecting resin from a predetermined position of the bottom portion during molding. And at least one of the outer surface and the inner surface of the bottom portion has a circumferential ridge extending in the circumferential direction and a predetermined interval in the circumferential direction, and one end is connected to the circumferential ridge and the other end side is A plurality of radial ridges extending toward the peripheral wall are provided, and the circumferential ridges and the radial ridges are formed integrally with the bottom. Here, the “circumferential direction” is a concept including not only the arc direction but also a tangential direction with respect to the arc direction (a direction orthogonal to or intersecting with the radial direction from the center toward the outer periphery). The concept includes a direction extending from the center toward the outer periphery, as well as a direction extending toward the outer periphery without passing through the center.

  According to this container, at least one of the outer surface and the inner surface of the bottom portion has a circumferential ridge extending in the circumferential direction and a predetermined interval in the circumferential direction, and one end is connected to the circumferential ridge and the other end. A plurality of radial ridges extending toward the peripheral wall are provided, and the circumferential ridges and the radial ridges are formed integrally with the bottom, so that the mold used for injection molding the container Is a space for forming the peripheral wall by molding (peripheral wall portion forming space), a space for forming the bottom portion (bottom portion forming space), and a space for forming circumferential ridges (hereinafter referred to as the circumferential direction). A space for forming a radial ridge (hereinafter referred to as a radial ridge forming space) to communicate with each other to form a molding space corresponding to the shape of the container. Will be.

  Since the container is molded by injecting resin from a predetermined position on the bottom as described above, the resin is injected from a predetermined position in the bottom molding space at the time of molding. When the resin is injected from a predetermined position in the bottom molding space in this way, the resin flows so as to spread in the bottom molding space around the predetermined position. Then, since the circumferential ridge forming space is formed so as to extend in the circumferential direction of the bottom molding space in accordance with the shape of the circumferential ridge, the resin flowing from a predetermined position is the circumferential ridge. It will reach the molding space. Since the circumferential ridge forming space becomes a space (gap) wider than the bottom forming space, the resin that has reached the circumferential ridge forming space flows along the circumferential ridge forming space, It flows along the radial ridge forming space communicating with the directional ridge forming space. The resin flowing in the radial ridge forming space spreads over the entire area of the bottom molding space located between the radial ridge forming spaces, and the resin does not flow into the peripheral wall forming space. This will fill the molding space.

  As described above, since resin flows mainly in the circumferential ridge forming space and the radial ridge forming space during molding, even if the bottom molding space is formed with a narrow gap, pressure loss in the bottom molding space is suppressed. Thus, the resin can be filled into the bottom molding space and the radial ridge molding space. In other words, a circumferential ridge is formed on at least one of the outer surface and the inner surface of the bottom so as to surround a predetermined position where the resin is injected, and one end is connected to the circumferential ridge and the other end. A container in which a plurality of radial ridges whose sides extend toward the peripheral wall is formed with a thin bottom portion and a light weight. Moreover, even if the thickness of the bottom portion is reduced by providing the circumferential ridge and the plurality of radial ridges, there is an effect that the strength of the bottom can be made sufficient.

  As one aspect of the present invention, at least one of the outer surface and the inner surface of the bottom is provided with a plurality of inner radial ridges extending from the circumferential ridge toward a predetermined position, and each inner radial ridge is The one end gathers at the predetermined position while the other end is connected to the circumferential ridge at a position displaced in the circumferential direction with respect to the connection position of the radial ridge to the circumferential ridge. There may be.

  In this way, the mold used for injection molding the container has a space for forming the inner radial ridges (hereinafter referred to as the inner radial ridge forming space) by assembling the mold. What forms the shaping | molding space connected to the direction convex line shaping | molding space and the bottom part shaping | molding space is employ | adopted.

  Then, since the inner radial ridge forming space is formed so as to connect the predetermined position and the circumferential ridge forming space, when the resin is injected from the predetermined position, the resin While flowing through the inner radial ridge forming space, which is a space (gap) wider than the bottom forming space, toward the directional ridge forming space, it spreads into the bottom forming space. Therefore, as in the case where the resin flows from the circumferential ridge forming space along the radial ridge forming space, pressure loss can be suppressed even between the predetermined position where the resin is injected and the circumferential ridge forming space. it can. Therefore, the wall thickness in the region surrounded by the circumferential protrusion on the bottom of the container can be surely reduced, and the container can be further reduced in weight.

  Further, each inner radial ridge has one end gathered at the predetermined position, while the other end is circumferentially displaced with respect to the connection position of the radial ridge with respect to the circumferential ridge. Since it is connected to the direction ridges, it is possible to prevent the resin flowing from the inner radial direction ridge forming space from flowing directly into the radial direction ridge forming space, and to flow the resin evenly in each space. it can. That is, since the resin flowing in the inner radial ridge forming space can be poured into the radial ridge forming space via the circumferential ridge forming space, the resin can be made to flow downstream while being spread in the circumferential direction. More stable resin flow can be realized.

  As another aspect of the present invention, a plurality of the circumferential ridges are formed at a predetermined interval in the radial direction of the peripheral wall with the predetermined position as the center, and the radial ridges are formed by connecting the circumferential ridges to each other. You may be comprised by the 1st radial direction protruding item | line and the 2nd radial direction protruding item | line which connect a circumferential direction protruding item | line and a surrounding wall.

  In this way, in the mold used for injection molding of the container, a plurality of circumferential ridge forming spaces for forming the circumferential ridges are formed concentrically around a predetermined position by assembling the mold. As well as connecting the circumferential projection forming spaces, the first radial projection forming space for forming the first radial projection, and connecting the circumferential projection forming space and the peripheral wall forming space, What forms the 2nd radial direction ridge forming space for forming said 2nd radial direction ridge is employ | adopted.

  As described above, since the radial ridges are formed with a predetermined interval in the circumferential direction, the interval between adjacent radial ridges becomes wider toward the peripheral wall, and the radial ridge is formed. Even in the space, as it goes to the peripheral wall forming space, the space between adjacent radial convex forming spaces will spread, and even if the resin flowing in the radial convex forming space flows out into the bottom forming space in the circumferential direction, the bottom There are cases where the resin flowing in the radial ridge forming space reaches the peripheral wall forming space before the resin fills the forming space.

  That is, when the outer diameter of the peripheral wall is large and the number of radial ridges is small, the area between the radial ridges is relatively wide. Even if it flows out to the molding space in the circumferential direction, the resin flowing in the radial projection molding space may reach the circumferential wall molding space before the resin fills the bottom molding space, but it forms a circumferential projection. If a plurality of circumferential protrusion forming spaces are formed between the predetermined position and the peripheral wall forming space, the radial protrusion forming space (the first radial protrusion for forming the first radial protrusion) is formed. After the resin flowing through the strip forming space) flows into the circumferential projection forming space and spreads in the circumferential direction, the radial projection forming space (second for forming the second radial projection) is formed again. (Radial ridge forming space) and flow toward the peripheral wall forming space. The thickness of the bottom portion is thin, and the even larger diameter of the vessel resin reliably, can be and smoothly filled.

  In this case, it is preferable that the connection position with respect to the circumferential ridge of the first radial ridge and the second radial ridge is displaced in the circumferential direction. If it does in this way, at the time of shaping | molding, the resin which flows from the 1st radial direction ridge forming space for shape | molding a 1st radial direction ridge will once form the circumferential direction ridge for forming a circumferential direction ridge. After flowing in the circumferential direction along the molding space, it will flow through the second radial projection forming space for molding the second radial projection, and the downstream side while flowing the resin in the circumferential direction in multiple stages The flow of the resin flowing and spreading in the bottom molding space can be made uniform by the circumferential ridges, and the resin can be smoothly filled in the bottom molding space. That is, it is possible to prevent the resin from flowing in a straight line from the predetermined position toward the peripheral wall, and the bottom molding space can be filled with the resin smoothly.

  Further, a plurality of vertical ribs extending in the vertical direction are radially formed on the outer peripheral surface of the peripheral wall, and the radial ridges are connected to the peripheral wall so as to coincide with the formation position of the lower end of the vertical rib. May be. In this way, the mold used for injection molding of the container has a space for forming vertical ribs (hereinafter referred to as vertical rib forming space) by assembling the peripheral wall portion forming space and the radial direction. What forms the shaping | molding space connected to the protruding line shaping | molding space will be employ | adopted. Then, as described above, the resin that has flowed through the radial ridge forming space flows into the vertical rib forming space, and further flows downstream along the vertical rib forming space.

  At this time, in the same manner as flowing into the bottom molding space from the radial ridge molding space, the resin flows into the peripheral wall molding space between the vertical rib molding spaces. Will flow in and fill up. Therefore, since the same action as that when the bottom portion is formed can be obtained when the peripheral wall is formed, the peripheral wall can also be formed thin, and the weight of the container can be further reduced. Further, since the container has a plurality of vertical ribs formed radially on the outer peripheral surface of the peripheral wall, the vertical ribs can reinforce the strength surface even if the peripheral wall is thin, and the vertical ribs when gripped. Since it is in a non-contact state with the peripheral wall by gripping the tip of the container, for example, even when hot food or the like is stored as an object to be stored, the heat of the object to be stored is not easily transmitted to the gripped finger and is insulated. It is possible to make the container excellent in effect.

  As described above, according to the container according to the present invention, it is possible to achieve an excellent effect of suppressing a reduction in the pressure loss of the resin during molding and reducing the weight by forming the bottom part thin.

  Hereinafter, a container according to a first embodiment of the present invention will be described with reference to the accompanying drawings. The container according to the present embodiment accommodates instant foods (for example, instant noodles, snack noodles, etc.) that can be eaten by pouring hot water, hot beverages (for example, coffee, soup, etc.), frozen products, It is a heat-insulating container that accommodates low-temperature items such as refrigerated goods.

  Such a heat insulating container is formed by injection molding using polypropylene, high-density polyethylene or the like as a material, and as shown in FIG. 1, a cylindrical peripheral wall 1 and a bottom portion 2 that closes an opening on one end side of the peripheral wall 1. It consists of and.

  The peripheral wall 1 includes an upper peripheral wall portion 10 that forms an upper opening (accommodating port), and a lower peripheral wall portion 11 on the bottom 2 side that has a smaller outer diameter than the upper peripheral wall portion 10. The upper peripheral wall portion 10 and the lower peripheral wall portion 11 are continuously formed via an annular connecting portion 12.

  The upper peripheral wall portion 10 includes an annular flange portion 100 that forms the upper opening, a large diameter portion 101 that extends downward from the flange portion 100, and a peripheral wall that extends downward from the large diameter portion 101. And a main body 102.

  The flange portion 100 is formed in a U-shaped cross section, and has an annular shape so as to form the upper opening at one piece portion 100a. That is, the flange portion 100 is formed such that a portion 100c (connection portion) connecting the pair of pieces 100a and 100b forms the upper end surface of the heat insulating container. The flange portion 100 has a seal lid (not shown) in which an aluminum foil and a laminate material such as a synthetic resin film or paper are laminated, and is detachably attached to the connection portion 100c which is the upper surface of the heat insulating container. As a result, the inside of the heat insulating body is sealed.

  The large diameter portion 101 has a cylindrical shape, and an upper end opening edge portion is connected to a lower end edge of one piece portion 100 a of the flange portion 100. The large-diameter portion 101 is formed so that both the front and back surfaces are uniform, and an upper connection portion 103 that protrudes inward and forms a horizontal ring is formed at the lower opening edge.

  The peripheral wall main body 102 is formed in a cylindrical shape, and is set so that the outer diameter becomes smaller toward the lower side. The peripheral wall main body 102 has an upper end opening edge connected to the inner peripheral edge of the upper connecting portion 103 and a lower end opening edge connected to the outer peripheral edge of the connecting portion 12 forming an annular shape. In addition, a reinforcing piece 104 projects downward from the lower end opening edge of the upper peripheral wall portion 10 (peripheral wall main body portion 102) so as to have a predetermined distance from the lower peripheral wall portion 11 connected to the connection portion 12. The reinforcing piece 104 is in a state where both ends in the circumferential direction of the upper peripheral wall portion 10 are connected to the side surfaces of the vertical rib 3 described later.

  The lower peripheral wall portion 11 has a cylindrical shape, and an outer diameter of an upper end opening edge portion is set corresponding to an inner diameter of the connection portion 12, and is formed such that the outer diameter becomes smaller toward the lower side. The lower peripheral wall portion 11 has a thin peripheral wall portion 110 having a cylindrical shape whose lower end opening is closed by the bottom portion 2, and a thick cylindrical shape extending upward from the upper end edge of the thin peripheral wall portion 110. It is comprised by the meat surrounding wall part 111. FIG.

  As shown in FIG. 2, the thin peripheral wall portion 110 has a substantially uniform wall thickness. In this embodiment, the wall thickness C <b> 1 is set to about 0.2 mm.

  The thick peripheral wall portion 111 is set to be thicker than the thin peripheral wall portion 110, the upper end edge portion is connected to the inner peripheral edge portion of the connection portion 12, and the inner peripheral surface is the inner periphery of the thin peripheral wall portion 110. A flat surface and a uniform surface are formed, and a step is formed on the outer peripheral surface side in the connection portion with the thin peripheral wall portion 110. In other words, the thick peripheral wall 111 has a state in which the outer peripheral surface protrudes outward from the outer peripheral surface of the thin peripheral wall 110.

  In addition, a plurality of vertical ribs 3 extending in the vertical direction project radially from the outer peripheral surface of the peripheral wall 1 (upper peripheral wall portion 10 and lower peripheral wall portion 11). Each vertical rib 3 is formed continuously from the lower surface of the upper connecting portion 103 to the lower end of the lower peripheral wall portion 11 (see FIG. 1).

  As shown in FIG. 3 (cross section II in FIG. 2), the vertical rib 3 has a substantially triangular cross section, and the bottom of the triangular shape is connected to the outer peripheral surface of the peripheral wall. In the vertical rib 3 according to this embodiment, the thickness A of the portion (bottom side) connected to the thin peripheral wall portion 110 is set to about 0.7 mm, and the protrusion amount B (triangle) from the outer peripheral surface of the thin peripheral wall portion 110 The height of the shape) is set to about 2.7 mm.

  The vertical rib 3 protruding from the lower peripheral wall portion 11 is formed to protrude outward with a substantially uniform protrusion amount with reference to the inner peripheral surface of the lower peripheral wall portion 11, and the upper peripheral wall portion 10 (peripheral wall body portion 102). The vertical rib 3 protruding from the lower peripheral wall portion 11 is formed so that the front end is located on a line connecting the front end of the vertical rib 3 protruding from the lower peripheral wall portion 11 and the outer peripheral edge of the upper connection portion 103. When the thickness of the thin peripheral wall portion 110 and the thickness and dimensions of the vertical rib 3 are set as described above, the thick peripheral wall portion 111 has a vertical height H of about 1 mm to 10 mm. (For example, 7 mm) and the thickness C2 is preferably set to 0.3 mm to 0.8 mm (for example, 0.5 mm) (see FIG. 2).

  As shown in FIG. 4 (section II-II in FIG. 1), the bottom 2 is formed in a disk shape, and has an opening on one end side of the peripheral wall 1 having the above-described configuration (a lower end opening of the lower peripheral wall 11). Blocked. The bottom portion 2 is set to have a thickness of about 0.2 mm. From the viewpoint of smoothness of forming the ultrathin bottom portion 2 and reinforcement of the bottom portion 2, A circumferential ridge 20 extending in the circumferential direction and a plurality of radial ridges 22 extending from the circumferential ridge 20 toward the circumferential wall 1 with a predetermined interval in the circumferential direction are provided. Moreover, the heat insulation container which concerns on this embodiment is directed to the injection | emission position P (predetermined position: center of the bottom part 2 in this embodiment) of the resin at the time of shaping | molding from the said circumferential protrusion 20 on the one surface of the bottom part 2. A plurality of inner radial ridges 21 extending in a protruding manner are provided with a predetermined interval (angle) in the circumferential direction. Each inner radial ridge 21 has one end concentrated at the predetermined position P and the other end connected to the circumferential ridge 20. That is, the inner radial ridges 21 are formed radially toward the circumferential ridge 20 with the predetermined position P as the center.

  The circumferential ridges 20 according to the present embodiment are continuously formed in the circumferential direction so as to surround a predetermined region including the center (a predetermined position P at which resin is injected during molding). In the shape of a circular ring. In the present embodiment, the circumferential ridges 20 are formed in two (two strips) so as to be concentric at a predetermined position P and have a predetermined interval in the radial direction of the peripheral wall 1. The radial ridge 22 according to the embodiment includes a first radial ridge 22a formed by connecting the inner circumferential ridge 20a and the outer circumferential ridge 20b with the circumferential ridge 20 as a boundary, and an outer side. It is comprised with the 2nd radial direction protruding item | line 22b which connected the circumferential direction protruding item | line 20b and the surrounding wall 1. As shown in FIG.

  The first radial ridge 22a is formed in a linear shape, and one end is connected to the inner circumferential ridge 20a and the other end is connected to the outer circumferential ridge 20b. The connection position with the circumferential ridge 20a on one end side of the first radial ridge 22a is displaced in the circumferential direction with respect to the connection position between the inner radial ridge 21 and the circumferential ridge 20a. .

  The second radial ridge 22 b is formed in a linear shape, and one end is connected to the outer circumferential ridge 20 b and the other end is connected to the peripheral wall 1. The connection position of the second radial ridge 22b with the outer circumferential ridge 20b is displaced in the circumferential direction with respect to the connection position of the circumferential ridge 20b and the first radial ridge 22a. .

  In the present embodiment, the inner radial ridges 21 and the radial ridges 22 (first radial ridges 22a and second radial ridges 22b) are bordered on the circumferential ridges 20a as they go to the peripheral wall 1. The number of strips in the circumferential direction is increasing. That is, the relationship between the numbers of the respective strips is the inner radial ridge 21 <first radial ridge 22a <second radial ridge 22b, and the interval between the inner radial ridges 21 adjacent in the circumferential direction. The intervals between the radial ridges 22 (the interval between the first radial ridges 22a and the interval between the second radial ridges 22b) do not become too wide. When the inner radial ridges 21 and the radial ridges 22 are formed at a certain angle in the circumferential direction around the predetermined position P (formed radially around the predetermined position P), the inner radial direction Because the interval between the ridges 21 and the interval between the radial ridges 22 become wider toward the outer peripheral side and the flow efficiency of the resin during molding decreases, the inner radial ridges 21 and the radial ridges 22 (first In each of the radial ridges 22a and the second radial ridges 22b), the number of ridges is increased toward the peripheral wall 1 in order to uniformize the circumferential interval and uniform the resin flow distribution during molding. ing.

  In the present embodiment, since the thickness of the bottom portion 2 is set to about 0.2 mm, as shown in FIG. 5, the circumferential ridges 20a and 20b, the inner radial ridges 21, the radial ridges 22 ( The first radial ridge 22a and the second radial ridge 22b) are set such that the width D1 of the connection position with the bottom 2 is about 0.7 mm and the tip width D2 is about 0.6 mm, and the height E Is set to about 0.5 mm and is formed in a trapezoidal cross section. In addition, in order to form the wall thickness C3 of the bottom portion 2 with about 0.2 mm, the circumferential ridge 20, the inner radial ridge 21, the radial ridge 22 (first radial direction) in consideration of the resin flow The height E of the projections 22a and the second radial projections 22b) is set to 0.5 mm or more, and the inner radial projections 21 and the radial projections 22 (first radial projections 22a and second diameters). It is preferable that the circumferential interval in each of the directional protrusions 22b) is 10 mm or less (particularly 8 mm or less).

  Moreover, in this embodiment, since the vertical rib 3 is protrudingly provided on the outer peripheral surface of the peripheral wall 1, the other end of the radial ridge 22 on the peripheral wall 1 side (the peripheral wall side of the second radial ridge 22b). The other end is formed so as to coincide with the formation position of the lower end of the vertical rib 3. That is, the inner radial ridge 21, the inner circumferential ridge 20a, the first radial ridge 22a, the outer circumferential ridge 20b, and the second radial ridge 22b are formed from a predetermined position P during molding. The resin that has flowed while flowing continuously flows to the downstream side (upper end opening side of the peripheral wall 1) while forming the vertical ribs 3 continuously.

  The heat insulating container having the above structure increases the strength in the radial direction by the connecting portion 12, the flange portion 100, the upper connecting portion 103, the reinforcing piece 104, and the vertical rib 3, and prevents the heat insulating container from being deformed when gripped. The circumferential ridges 20 (20a, 20b), the inner radial ridges 21, and the radial ridges 22 projecting from the lower surface of the bottom 2 are also configured to increase the strength of the bottom 2 formed thin. Yes. In addition, by providing a large number of vertical ribs 3 so as to protrude from the outer peripheral surface of the peripheral wall 1, the fingers that grip the tip of the vertical rib 3 and the outer peripheral surfaces of the peripheral walls (upper peripheral wall portion 10 and lower peripheral wall portion 11). A space is formed between the two and the heat of the contents accommodated in the heat insulating container is difficult to be transmitted to the grasped finger, and burns and the like can be prevented.

  The heat insulating container having the above configuration is decorated by winding a label made of a heat-shrinkable film on which predetermined patterns and characters are printed on the vertical ribs 3 and distributed in the market in that state. In addition, since the space | interval of the surrounding wall at the time of holding | grip and a finger | toe becomes small and heat insulation falls when the protrusion amount of the vertical rib 3 is lower than the said dimension, it replaces with the said heat-shrinkable film, and is heat-shrinkable. The label which consists of a foamed resin film which has this is wound, and heat insulation is ensured.

  The heat insulation container of the said structure is shape | molded using an injection molding apparatus. As shown in FIG. 6, the injection molding apparatus includes a first mold 81a having a cavity 80 formed in conformity with the outer shape of the heat insulating container, and a core 82 formed in conformity with the internal shape of the heat insulating container. Two molds 81b are provided. In addition, since the injection molding apparatus is well-known, description is abbreviate | omitted about structures other than the 1st type | mold 81a and the 2nd type | mold 81b.

  The first mold 81a and the second mold 81b are configured such that a molding space for molding the heat insulating container is formed between the cavity 80 and the core 82 by clamping.

  The molding space includes a disk-shaped bottom molding space 83 that molds the bottom 2, and an outer peripheral edge portion and one end of the bottom molding space 83 that communicate with each other to form the lower circumferential wall portion 11. A part forming space 84, a cylindrical upper peripheral wall part forming space 85 in which the diameter is set larger than the lower peripheral wall part forming space 84 and forming the upper peripheral wall part 10, and the other end opening of the lower peripheral wall part forming space 84 And the one end opening of the upper peripheral wall portion forming space 85 are communicated, and the annular connecting portion forming space 86 for forming the connecting portion 12, and the upper peripheral wall portion forming space 85 and the lower peripheral wall portion forming space 84 swell radially. As shown in the drawing, it is constituted by a vertical rib forming space 87 that communicates with the upper peripheral wall forming space 85 and the lower peripheral wall forming space 84 in the central axis direction and forms the vertical rib 3.

  Further, the reinforcing piece 104 is molded from the one end opening of the upper peripheral wall portion forming space 85 in communication with the connection portion forming space 86 toward the bottom portion 2 side with a predetermined distance from the lower peripheral wall portion forming space 84. A reinforcing piece forming space 89 is formed.

  The upper peripheral wall portion forming space 85 includes a peripheral wall main body forming space 93 in which the one end opening communicates with the connecting portion forming space 86 and the peripheral wall main body portion 102 is formed; An annular large-diameter molding space 94 that communicates with the end opening and that molds the large-diameter portion 13, and a flange-portion molding space that communicates with the other-end opening of the large-diameter portion molding space 94 and molds the flange portion 100. 95.

  The lower peripheral wall forming space 84 has a cylindrical thin peripheral wall forming space 90 whose one end communicates with the bottom forming space 83, and a gap between the cavity 80 and the core 82 is wider than a clearance between the thin peripheral wall forming space 90. One end opening is connected to the other end opening of the thin-walled peripheral wall forming space 90, and the other end opening is formed of a cylindrical thick-walled peripheral wall forming space 91 that is connected to the connecting portion forming space 86.

  In the thin peripheral wall portion forming space 90, the gap X1 between the cavity 80 and the core 82 is set to about 0.2 mm corresponding to the thickness C1 of the thin peripheral wall portion 15, as shown in FIG. .

  In the thick peripheral wall portion forming space 91, the gap X2 between the cavity 80 and the core 82 is set to 0.3 mm to 0.8 mm corresponding to the thickness C2 and the height H of the thick peripheral wall portion 16. In addition, the width L in the axial direction is set to about 1 mm to 10 mm.

  The inner periphery of the thin peripheral wall portion forming space 90 and the thick peripheral wall portion forming space 91 has a uniform surface state so that the inner peripheral surfaces of the thin peripheral wall portion 15 and the thick peripheral wall portion 16 of the heat insulating container are uniform. In addition, the thick peripheral wall portion forming space 91 is in a state where the outer peripheral side bulges outward from the outer periphery of the thin peripheral wall portion forming space 90. That is, the outer peripheral surface forming the thin peripheral wall portion forming space 90 and the thick peripheral wall portion forming space 91 in the core 82 is a uniform surface.

  As shown in FIG. 8 (section III-III in FIG. 6), the vertical rib forming space 87 is formed by a cavity 80 and communicates with the lower peripheral wall portion forming space 84 and the upper peripheral wall portion forming space 85. The vertical rib forming space 87 is formed with a substantially constant bulging amount from the outer periphery of the peripheral wall main body forming space 93 and the lower peripheral wall forming space 84, and the thickness A and the protruding amount of the vertical rib 3. Corresponding to B, the gap width Y of the communicating portion with the thin peripheral wall portion forming space 90 is set to about 0.7 mm, and the bulging amount Z (triangular height from the outer periphery of the thin peripheral wall portion forming space 90 is set. ) Is set to about 2.7 mm.

  Furthermore, as described above, the heat insulating container according to this embodiment includes the circumferential ridge 20, the inner radial ridge 21, and the radial ridge 22 (first radial ridge 22a, second radial ridge 22b). Is protruded on one surface of the bottom portion 2, the molding space formed by assembling the mold communicates with the bottom molding space 83 as shown in FIG. 9 (IV-IV cross section in FIG. 6). As described above, two circumferential ridge forming spaces 99a and 99b for forming the two circumferential ridges 20a and 20b are formed, and from the predetermined position P to the outer periphery (lower peripheral wall portion forming space 84). The inner radial ridge forming space 97 for forming the inner radial ridge 21, the first radial ridge forming space 98a for forming the first radial ridge 22a, and the second radial protrusion. The second radial projection forming space 98b for forming the strip 22b It is formed in the boundary direction convex molding space 99.

  As described above, the thickness C3 of the bottom portion 2 is set to about 0.2 mm, the circumferential ridges 20 (20a, 20b), the inner radial ridges 21, the radial ridges 22 (first radial ridges 22a). In the second radial ridge 22b), the width D1 of the connection position with the bottom 2 is set to about 0.7 mm, the tip width D2 is set to about 0.6 mm, and the height E is set to about 0.5 mm. 10 is formed in a trapezoidal cross section, the gap width S of the bottom molding space 83 is set to about 0.2 mm as shown in FIG. 10, and the circumferential ridge molding spaces 99a, 99b, the inner diameter are set. Each of the direction ridge forming space 97, the first radial direction ridge forming space 98a, and the second radial direction ridge forming space 98b has a gap width Q2 of a communicating portion with the bottom forming space 83 of about 0.7 mm. The gap width Q1 on the front end side is set to about 0.6 mm, and the bottom molding space 83 is set. Inflated amount R from the lower surface is set to approximately 0.5 mm.

  Returning to FIG. 6, a sprue portion 96 for injecting resin from the center (predetermined position P) of the bottom molding space 83 is formed in the cavity 80 configured to be able to form the molding space having the above-described configuration. That is, the heat insulating container having the above-described configuration can be formed by flowing resin from the center of the bottom portion 2 to the downstream side during molding.

  The molding of the heat insulating container having the above configuration will be specifically described. By injecting (injecting) the molten resin injected from the injection molding apparatus from the sprue portion 96 of the cavity 80, the molten resin is in the bottom molding space. It flows in the radial direction (downstream side) from the center of 83. That is, since the inner radial ridge forming space 97 is formed by a gap (space) wider than the bottom molding space 83, the resin injected from the sprue portion 96 has an inner radial convex shape as shown in FIG. While flowing in the strip forming space 97 from the center position toward the outer periphery, it spreads in the bottom forming space 83. Then, as shown in FIG. 11 (b), the resin flows into the circumferential ridge forming space 99a from the inner radial ridge forming space 97, and after the resin once flows in the circumferential direction, as shown in FIG. It flows through the first radial projection forming space 98 a and spreads into the bottom forming space 83. Then, as shown in FIG. 11B, the resin flowing in the first radial ridge forming space 98a flows into the outer circumferential ridge forming space 99b and flows in the circumferential direction, and then the second radial ridge. After flowing through the molding space 98 b and expanding into the bottom molding space 83, it flows into the lower peripheral wall molding space 84 and the vertical rib molding space 87. Thus, when the resin flows from the predetermined position P to the peripheral wall 1 side, as described above, the inner radial ridge forming space 97 and the radial ridge forming space 98 (first radial ridge forming space 98a, second Since the resin flowing in the radial ridge forming space 98b) becomes the top and spreads in the bottom forming space 83, the molding space is filled with the resin. Therefore, in order to form the bottom 2 thinly, the bottom forming space 83 is formed. Even if it is formed with a minute gap, the resin surely flows downstream without causing a large pressure loss. That is, the bottom molding space 83 and the radial ridge forming space are such that the resin flows into the bottom molding space 83 due to the flow of the resin in the inner radial ridge forming space 97 and the radial ridge forming space 98. Since the resin is filled in 98, it is prevented that the flow of the resin is hindered by pressure loss before reaching the lower peripheral wall portion forming space 84, and the lower peripheral wall portion forming space 84 (the peripheral wall 1 is formed). The resin can be surely poured into the molding space) side for molding.

  When the resin flows into the lower peripheral wall molding space 84 and the vertical rib molding space 87 from the bottom molding space 83 and the second radial projection forming space 98b, as shown in the resin flow distribution diagram of FIG. Resin that flows in the vertical rib molding space 87 in which the gap is set wider than the thin peripheral wall molding space 90, and flows into the thin peripheral wall molding space 90 from the vertical rib molding space 87, and the bottom molding space In a state in which the resin flowing directly from 83 into the thin peripheral wall portion forming space 90 follows, it flows toward the thick peripheral wall portion forming space 91 (connecting portion forming space 86). Thereby, the resin flowing in the central portion of the thin peripheral wall molding space 90 between the vertical rib molding spaces 87 and 87 is in a state of flowing much later than the resin flowing in the vertical rib molding spaces 87 and 87, The flow distribution of the resin in the circumferential direction of the lower peripheral wall molding space 84 is convex in the longitudinal rib molding space 87 and the thin peripheral wall molding space 90 in the vicinity thereof, and is concave in the center of the thin peripheral wall molding space 90. The waveform shape is greatly undulating.

  When the resin in the thin peripheral wall portion forming space 90 reaches the thick peripheral wall portion forming space 91, the gap in the thick peripheral wall portion forming space 91 becomes a gap in the thin peripheral wall portion forming space 90, as shown in FIG. Therefore, the resin easily flows into the thick peripheral wall portion forming space 91 from the vertical rib forming space 87.

  As a result, the resin flows from the vertical rib forming space 87 into the thick peripheral wall forming space 91 in the circumferential direction, and the leading flow of the resin flowing in the vertical rib forming space 87 becomes slow.

  Then, the resin flowing in the thin peripheral wall portion forming space 90 located between the vertical rib forming spaces 87 so as to follow the resin in the vertical rib forming space 87 fills the thick peripheral wall portion forming space 91. The catching up with the resin that is about to occur, the undulation of the flow distribution of the resin in the circumferential direction of the lower peripheral wall portion forming space 84 (the thick peripheral wall portion forming space 91 and the vertical rib forming space 87) is reduced.

  As a result, as shown in FIG. 12C, the flow distribution of the resin flowing in the vertical rib forming space 87 and the thick peripheral wall forming space 91 is substantially uniform before the resin reaches the connecting portion forming space 86. Thus, the resin in the vertical rib forming spaces 87, 87... And the thick peripheral wall portion forming space 91 between the vertical rib forming spaces 87, 87 flows into the connection portion forming space 86 in a substantially uniform flow distribution state. It becomes.

  Thereby, the air in the connection portion molding space 86 is pushed out to the upper peripheral wall portion molding space 85 side by the inflow of resin from the thick wall portion molding space 91, without forming an air pocket in the connection portion molding space 86. The resin will fill up.

  Then, the resin sequentially flows into the reinforcing piece molding space 89, the peripheral wall body portion molding space 93, the large diameter portion molding space 94, and the flange portion molding space 95 through the connection portion molding space 86 to fill each molding space. Thus, the heat insulation container having the above configuration is completed.

  As described above, in the heat insulating container according to the present embodiment, the circumferential ridges 20 (20a, 20b) and the radial ridges 22 (first radial ridges 22a, second radial direction) are provided on one surface of the bottom portion 2. Since the ridges 22b) are formed, even if the bottom 2 is extremely thin, the flow of resin during molding is not hindered, and the bottom 2 can be formed smoothly and reliably.

  Further, a plurality of inner radial ridges 21 extending from the circumferential ridges 20 (20a) to a predetermined position P for injecting resin are provided, and one end of each inner radial ridge 21 is gathered at the predetermined position P, and others Since the end is formed so as to be connected to the circumferential ridge 20a, the flow of the resin can be ensured even at the initial stage during molding. Thereby, even if the radial distance from the predetermined position P to the circumferential ridge 20a increases, the resin can surely reach the circumferential ridge 20a. Can be molded.

  Further, the radial ridges 22 (second radial ridges 22 b) are arranged so that one end (termination) on the peripheral wall 1 side of the radial ridges 22 (second radial ridges 22 b) substantially coincides with the lower ends of the vertical ribs 3. 22b), the flow of the resin can be secured not only at the bottom 2 but also at the time of molding the peripheral wall 1 in the same manner as at the bottom 2. Thereby, the bottom part 2 and the surrounding wall 1 are formed thinly, and further weight reduction is attained.

  Further, the container includes a lower peripheral wall portion 11 that is continuous with the upper peripheral wall portion 10 via the connection portion 12, a thin peripheral wall portion 15 on the bottom 2 side, and a thick peripheral wall that is thicker than the thin peripheral wall portion 15. Since it is composed of the portion 16, the flow in the resin flow in the vertical rib forming space 87 formed by the first mold 81a and the second mold 81b of the injection molding apparatus and the thin peripheral wall portion forming space 90 at the time of forming the heat insulating container. The resin in the lower peripheral wall molding space 84 and the vertical rib molding space 87 is allowed to reach the connection portion molding space 86 in a state where the distribution is substantially uniform before the resin reaches the connection portion molding space 86. It becomes.

  As a result, the resin flowing in from the vertical rib forming space 87 reaches the connection portion forming space 86 before the resin in the lower peripheral wall forming space 84 between the vertical rib forming spaces 87 to form the connection portion. It is possible to prevent a situation in which the air reservoir expands in the circumferential direction in the space 86 and an air pocket is formed between the resin in the lower peripheral wall forming space 84. Therefore, the completed heat insulation container is one in which the formation of pinholes in the vicinity of the connecting portion 12 is prevented, and the occurrence rate of defective products can be suppressed.

  Further, since the reinforcing piece 104 is provided at the lower end of the upper peripheral wall portion 10, the radial strength can be increased.

  Next, the container which concerns on 2nd embodiment of this invention is demonstrated. The container according to the present embodiment has the same configuration as the container according to the first embodiment except that the configurations of the circumferential ridges and the radial ridges are different, and thus the circumferential ridges and the radial direction. For the configuration other than the ridges, the description is omitted, and in the following description, the same configuration as the configuration of the first embodiment, or the configuration corresponding thereto, is given the same name and the same reference numerals as the first embodiment. And In the following description, the drawings (circumferential ridges and radial ridges) used in the description of the first embodiment for the sake of convenience in order to clarify the relationship between the circumferential ridges and radial ridges and other configurations. The drawings other than the above are referred to or diverted.

  As shown in FIG. 13 (section II-II in FIG. 1), the container according to the present embodiment has a circumferential ridge 20 extending in the circumferential direction on one surface serving as the outer surface of the bottom portion 2, as in the first embodiment. And a plurality of radial ridges 21 extending from the circumferential ridges 20 toward the circumferential wall 1 with a predetermined interval in the circumferential direction. Also in the heat insulating container according to the present embodiment, the resin is injected from one circumferential surface protrusion 20 onto one surface of the bottom portion 2 toward the injection position P (predetermined position: the center of the bottom portion 2 in the present embodiment). A plurality of extending inner radial ridges 21 are provided with a predetermined interval (angle) in the circumferential direction. One end of the inner radial ridge 21 is gathered at the predetermined position P, and the other end is connected to the circumferential ridge 20.

  The circumferential ridge 20 according to the present embodiment is intermittently formed so as to surround a predetermined region including the center (a predetermined position P at which resin is injected during molding). That is, the circumferential ridges 20 are formed in a plurality so as to surround the center (predetermined position) P of the bottom portion 2 and extend in the circumferential direction at the bottom portion 2 with a predetermined interval in the circumferential direction.

  In the present embodiment, the plurality of circumferential ridges 20 form a double intermittent ring surrounding a predetermined region. That is, the circumferential ridges 20 are doubled with a predetermined interval in the radial direction of the peripheral wall 1, and a plurality of the circumferential ridges 20 have a predetermined interval in the circumferential direction of the bottom portion 2. As a result, two intermittent rings are formed. Thus, the radial ridge 22 has a first radial ridge 22a that connects the inner circumferential ridge 20a and the outer circumferential ridge 20b with the circumferential ridge 20 as a boundary, and an outer side. It is comprised with the 2nd radial direction protruding item | line 22b which connected the circumferential direction protruding item | line 20b and the surrounding wall 1. As shown in FIG.

  Each of the first radial ridges 22a is formed in a linear shape, and has one end in the circumferential direction extending radially from the predetermined position P so as to be substantially perpendicular to the circumferential ridges 20a and 20b. It is connected to both ends of the ridge 20a, and the other end is connected to a substantially central portion of the outer circumferential ridge 20b. Accordingly, the connection position of the first radial protrusion 22a with the circumferential protrusion 20a on one end side is displaced in the circumferential direction with respect to the connection position of the inner radial protrusion 21 and the circumferential protrusion 20a. ing.

  Each of the second radial ridges 22b is formed in a linear shape, and one end of the second radial ridge 22b extends outwardly in a direction extending radially from the predetermined position P so as to be substantially perpendicular to the circumferential ridge 20b and the peripheral wall 1. The directional protrusion 20 b is connected to both ends, and the other end is connected to the peripheral wall 1. The connection position of the second radial ridge 22b with the outer circumferential ridge 20b is displaced in the circumferential direction with respect to the connection position of the circumferential ridge 20b and the first radial ridge 22a. .

  Thereby, also in this embodiment, the relationship between the number of the inner radial ridges 21 and the radial ridges 22 (first radial ridges 22a, second radial ridges 22b) is the inner radial ridges. 21 <first radial protrusion 22a <second radial protrusion 22b.

  The bottom portion 2 according to the present embodiment also has a wall thickness of about 0.2 mm. As shown in FIG. 5, the circumferential ridges 20a and 20b, the inner radial ridges 21, the radial ridges 22 ( The first radial ridge 22a and the second radial ridge 22b) are set such that the width D1 of the connection position with the bottom 2 is about 0.7 mm and the tip width D2 is about 0.6 mm, and the height E Is set to about 0.5 mm and is formed in a trapezoidal cross section. In addition, in order to form the thickness C3 of the bottom portion 2 at about 0.2 mm, in the same manner as in the first embodiment, in consideration of the flow of resin, the circumferential ridge 20, the inner radial ridge 21, the radial direction The height E of the ridges 22 (first radial ridges 22a, second radial ridges 22b) is set to 0.5 mm or more, and the inner radial ridges 21 and the radial ridges 22 (first diameter) It is preferable that the circumferential interval in each of the directional ridges 22a and the second radial ridges 22b) is 10 mm or less (particularly 8 mm or less).

  The heat insulation container of the said structure is shape | molded using an injection molding apparatus similarly to 1st embodiment. As shown in FIG. 6, the injection molding apparatus includes a first mold 81a having a cavity 80 formed in conformity with the outer shape of the heat insulating container, and a core 82 formed in conformity with the internal shape of the heat insulating container. The first mold 81a and the second mold 81b are clamped to form a bottom molding space 83, a lower peripheral wall molding space 84, an upper part between the cavity 80 and the core 82. A peripheral wall forming space 85, a connecting portion forming space 86, and a vertical rib forming space 87 are formed.

  Further, the heat insulating container according to the present embodiment includes the circumferential ridge 20, the inner radial ridge 21, and the radial ridge 22 (first radial ridge 22a, second radial ridge 22b) having the above-described configuration. Since the projection is provided on one surface of the bottom portion 2, as shown in FIG. 14 (IV-IV cross section in FIG. 6), a circumferential ridge 20a formed intermittently so as to communicate with the bottom molding space 83. , 20b are formed, and the inner radial ridge 21 is formed from the predetermined position P toward the outer periphery (lower peripheral wall forming space 84). Inner radial ridge forming space 97, first radial ridge forming space 98a for forming first radial ridge 22a, and second radial ridge for forming second radial ridge 22b. Each circumferential direction in which the molding space 98b is formed with an interval in the radial direction It is formed by a strip molding space 99 as a boundary.

  As described above, the thickness C3 of the bottom portion 2 is set to about 0.2 mm, the circumferential ridges 20 (20a, 20b), the inner radial ridges 21, the radial ridges 22 (first radial ridges 22a). In the second radial ridge 22b), the width D1 of the connection position with the bottom 2 is set to about 0.7 mm, the tip width D2 is set to about 0.6 mm, and the height E is set to about 0.5 mm. 10 is formed in a trapezoidal cross section, the gap width S of the bottom molding space 83 is set to about 0.2 mm as shown in FIG. 10, and the circumferential ridge molding spaces 99a, 99b, the inner diameter are set. Each of the direction ridge forming space 97, the first radial direction ridge forming space 98a, and the second radial direction ridge forming space 98b has a gap width Q2 of a communicating portion with the bottom forming space 83 of about 0.7 mm. The gap width Q1 on the front end side is set to about 0.6 mm, and the bottom molding space 83 is set. Inflated amount R from the lower surface is set to approximately 0.5 mm.

  A sprue portion 96 for injecting resin from the center (predetermined position P) of the bottom molding space 83 is formed in the cavity 80 configured to be able to form the molding space having the above configuration. That is, the heat insulating container having the above-described configuration can be formed by flowing resin from the center of the bottom portion 2 to the downstream side during molding (see FIG. 6).

  As in the first embodiment, the container having the above-described configuration is formed by injecting (injecting) from the sprue portion 96 of the cavity 80 and filling the molding space formed between the cavity 80 and the core 82 with resin. Is done. Specifically, since the inner radial ridge forming space 97 is configured with a gap (space) wider than the bottom forming space 83, when the resin is injected from the predetermined position P, as shown in FIG. The resin spreads in the bottom molding space 83 while flowing in the inner radial projection forming space 97 from the center position toward the outer periphery. Then, as shown in FIG. 15B, the resin reaches the circumferential ridge forming space 99a, and the resin flows in the circumferential direction so as to branch as shown in FIG. It flows through the first radial ridge forming space 98a communicating with the end of the directional ridge forming space 99a and spreads into the bottom forming space 83. Then, as shown in FIG. 15B, the resin flowing in the first radial ridge forming space 98a reaches the outer circumferential ridge forming space 99b and flows in the circumferential direction so as to branch again. The resin spreads in the bottom molding space 83 while flowing through the second radial projection molding space 98b communicating with the end of the outer circumferential projection molding space 99b, and then the lower circumferential wall molding space 84 and the vertical rib. It flows into the molding space 97.

  Thus, when the resin flows from the predetermined position P to the peripheral wall 1 side, as described above, the inner radial ridge forming space 97 and the radial ridge forming space 98 (first radial ridge forming space 98a, second Since the resin flowing in the radial ridge forming space 98b) becomes the top and spreads in the bottom forming space 83, the molding space is filled with the resin, so that the bottom 2 is formed thin as in the first embodiment. Therefore, even if the bottom molding space 83 is formed with a minute gap, the resin surely flows downstream without causing a large pressure loss. That is, also in the present embodiment, the bottom molding space 83 and the bottom molding space 83 and the resin flow into the bottom molding space 83 due to the resin flow in the inner radial projection forming space 97 and the radial projection forming space 98. Since the resin is filled in the radial ridge forming space 98, the flow of the resin is prevented from being hindered by pressure loss before reaching the lower peripheral wall forming space 84, and the lower peripheral wall forming. The resin can surely be poured into the space 84 (molding space for molding the peripheral wall 1).

  As described above, also in the heat insulating container according to the present embodiment, the circumferential ridges 20 (20a, 20b) and the radial ridges 22 (first diameter) are formed on one surface of the bottom portion 2 as in the first embodiment. Since the direction ridge 22a and the second radial direction ridge 22b) are formed, even if the bottom 2 is extremely thin, the flow of resin during molding is not hindered, and the bottom 2 can be formed smoothly and reliably. .

  Further, a plurality of inner radial ridges 21 extending from the circumferential ridges 20 (20a) to a predetermined position P for injecting resin are provided, and one end of each inner radial ridge 21 is gathered at the predetermined position P, and others Since the end is formed so as to be connected to the circumferential ridge 20a, the flow of the resin can be ensured even at the initial stage during molding. Thereby, even if the radial distance from the predetermined position P to the circumferential ridge 20a increases, the resin can surely reach the circumferential ridge 20a. Can be molded.

  Further, the radial ridges 22 (second radial ridges 22 b) are arranged so that one end (termination) on the peripheral wall 1 side of the radial ridges 22 (second radial ridges 22 b) substantially coincides with the lower ends of the vertical ribs 3. 22b), the flow of the resin can be secured not only at the bottom 2 but also at the time of molding the peripheral wall 1 in the same manner as at the bottom 2. Thereby, the bottom part 2 and the surrounding wall 1 are formed thinly, and further weight reduction is attained.

  In addition, the heat insulation container of this invention is not limited to the said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

  The present invention is effective when the thickness C3 of the bottom portion 2 is 0.15 mm to 0.3 mm (particularly 0.16 mm to 0.22 mm). On the other hand, the circumferential protrusion 20 and the radial protrusion are effective. The strip 22 preferably has a width D1 of 0.5 mm to 0.9 mm and a height E of 0.5 mm to 1.5 mm. The present invention is effective when a polypropylene resin having a melt flow rate (MFR) of 85 or more, preferably a propylene ethylene copolymer having an MFR of 90 to 130, particularly preferably an MFR of 105 to 130, is used. is there.

  In the first and second embodiments, the inner radial ridges 21 (inner radial ridges) are provided. However, the present invention is not limited to this. For example, the injection position of resin during molding (predetermined) The circumferential ridge 20 may be provided so as to surround the position P), and the radial ridge 22 may be formed so as to extend from the circumferential ridge 20 toward the circumferential wall 1. That is, in the predetermined area including the predetermined position P, the flow of the resin is hardly hindered, and therefore the resin flow can be ensured without providing the radial protrusions 22 in the area.

  In the said 1st and 2nd embodiment, although the circumferential direction protruding item | line 20 and the radial direction protruding item | line 22 protruded on the outer surface (one surface) of the bottom part 2, it is not limited to this, For example, the said structure The circumferential ridges 20 and the radial ridges 22 are projected on the inner surface of the bottom 2, or the circumferential ridges 20 and the radial ridges 22 are projected on both the outer surface and the inner surface of the bottom 2. You may make it do. Even in this case, since the circumferential ridge forming space 99 and the radial ridge forming space are formed in the molding space at the time of molding, the resin is placed in the circumferential ridge forming space 99 and the radial ridge forming space. The resin flows into the bottom molding space 83 due to the flow of the resin, and even if an attempt is made to mold the bottom 2 thinly, the resin flow is hindered by the resin pressure loss. Therefore, it is possible to provide a lightweight container in which the bottom 2 is thin.

  In the first and second embodiments, the circumferential ridges 20 are formed in two (double) with an interval in the radial direction of the bottom portion 2. One or more strips 20 may be provided corresponding to the outer diameter of the container. Further, the circumferential ridge 20 does not necessarily need to be formed with its center coincident with the injection position (predetermined position P) of the resin at the time of molding, and may be in an eccentric manner with respect to the center position of the bottom portion 2. . That is, the circumferential ridge 20 may be formed so as to surround a predetermined region including the predetermined position P. However, the predetermined region is a region in a range where the injected resin can reach the circumferential ridge 20, and if the resin can reach the circumferential ridge 20, the first radial projection as in the above embodiment. The bottom 2 and the peripheral wall 1 can be reliably molded by flowing along the strip forming space 98a.

  In the first and second embodiments, the plurality of vertical ribs 3 are provided on the outer peripheral surface of the peripheral wall 1. However, the present invention is not limited to this, and the cylindrical peripheral wall 1 and the peripheral wall 1 It may be a container having a bottomed cylindrical shape with the bottom 2 closing the opening on one end side.

  In said 1st and 2nd embodiment, although the surrounding wall 1 was formed in step shape by connecting the upper surrounding wall part 11 and the lower surrounding wall part 10 via the cyclic | annular connection part 12, it is limited to this. Instead, for example, the peripheral wall 1 may be formed in a straight cylindrical shape from the upper end to the lower end, or may be formed in a conical cylindrical shape in which the opening is set to have a smaller diameter toward the lower end side.

  In the first and second embodiments, the inside of the heat insulating container is sealed by sticking a seal lid to the upper end surface of the container. However, the present invention is not limited to this. It may be a container of the type in which the inside of the container is sealed with a fitting cap or the like.

  In the said 1st and 2nd embodiment, although the width | variety (thickness) of the circumferential direction protruding item | line 20 and the radial direction protruding item | line 22 was set equally, it is not limited to this, For example, as shown in FIG. You may make it make the width | variety of the circumferential direction protruding item | line 20 wider than the width | variety of the radial direction protruding item | line 22. In this way, when the resin is injected from the predetermined position P at the time of molding, the flow of the resin spreading in the radial direction is made uniform in the circumferential ridge molding space 99 and then toward the lower peripheral wall portion molding space 84 side. The resin can flow uniformly. In particular, when the inner radial ridge 21 is provided, the resin tends to flow in the inner radial ridge forming space 97 and flow toward the lower peripheral wall forming space 84 at the time of molding. As described above, it is preferable that the width of the circumferential ridge 20 (circumferential ridge forming space 99) is widened to increase the effect of uniformizing the flow of the resin during molding.

  In the first and second embodiments, the circumferential ridge 20 is formed in an annular shape, and the inner radial ridge 21, the first radial ridge 22a, and the second radial direction with the circumferential ridge 20 as a boundary. The number of protrusions 22b is increased toward the peripheral wall 1 side, but is not limited to this. For example, the number of radial protrusions 21 and 22 (22a and 22b) in each region is the same. But of course. However, if the interval between the radial ridges 22 on the side of the peripheral wall 1 is to be narrowed, the radial ridges 22 are very close to each other on the predetermined position P side, so that the portion has a substantially thick bottom 2. If the weight reduction is taken into consideration, it is possible to balance the distance between the radial ridges 22 on the predetermined position P side and the distance between the radial ridges 22 on the peripheral wall 1 side. The number is preferably set for each region. Accordingly, the inner radial ridges 21 extending from the predetermined position P to the circumferential ridges 20 have a predetermined angle or more in the circumferential direction (preferably 30 ° or more and 45 ° or less, more preferably 30 ° or more and 40 ° or less. ).

  In the first and second embodiments, the inner radial ridges 21 are formed at predetermined intervals in the circumferential direction in consideration of the flow of the resin at the time of molding. For example, the interval between the inner radial ridges 21 may be set relatively wide. In this case, since the interval between the inner radial ridge forming spaces 97 forming the inner radial ridges 21 becomes wide, the resin in the bottom molding space 83 between the inner radial ridge forming spaces 97 at the time of molding. This is a situation in which there is a risk that the flow of air is greatly delayed compared to the resin flowing in the inner radial ridge forming space 97, and as a result, air pockets are formed and pinholes are formed after molding. In order to avoid this, as shown in FIG. 17, at least one of the outer surface or inner surface of the bottom portion 2 is provided with a ridge 23 extending from the predetermined position P toward the circumferential ridge 20 on the inner radial ridges 21, 21. It is preferable to be provided in between. The ridges 23 do not need to reach the circumferential ridges 20 and may be formed so that the terminal ends are located between the predetermined position P and the circumferential ridges 20. In this way, the resin flowing in the molding space for molding the ridges 23 during molding is in contrast to the resin flowing in the bottom molding space 83 in the same manner as the resin flowing in the inner radial ridge molding space 97. Therefore, it flows into the bottom molding space 83 while flowing in advance, and it is possible to prevent the formation of the air pocket as described above. Further, the position where the ridge 23 is provided is not limited to the position between the inner radial ridges 21, but also between the other radial ridges (the first radial ridge 22 a and the second radial ridge 22 b). It may be provided.

  In said 1st and 2nd embodiment, the circumferential direction protruding item | line 20 is formed in cyclic | annular form, and the inner side radial direction protruding item | line 21 and the radial direction protruding item | line 22 are so that the connection position with respect to this circumferential direction protruding item | line 20 may displace to a circumferential direction. (The first radial ridge 22a and the second radial ridge 22b) are formed, but are not limited to this, for example, the inner radial ridge 21 and the first radial ridge 22a. The second radial ridge 22b may be formed on the same straight line. However, at the time of molding, in order to allow the resin to spread smoothly in the circumferential direction, the first radial ridge 22a on the predetermined position P side and the second radial ridge 22b on the circumferential wall side are the same as in the above embodiment. It is preferable to displace the connection position in the circumferential direction so that the resin flows downstream through the circumferential ridge forming space 99 during molding. The same applies to the case where the inner radial protrusion 21 is provided.

  In said 1st and 2nd embodiment, the cross-sectional shape of the circumferential direction protruding item | line 20, the inner side radial direction protruding item | line 21, and the radial direction protruding item | line 22 (1st radial direction protruding item | line 22a, 2nd radial direction protruding item | line 22b) is used. However, the present invention is not limited to this. For example, the cross section may be formed in a substantially rectangular shape, or the cross section may be formed in a semicircular shape, a semielliptical shape, or the like. That is, the outer surface of the circumferential ridge 20, the inner radial ridge 21, and the radial ridge 22 (first radial ridge 22a, second radial ridge 22b) forms a bent surface or an arc surface. You may form as follows.

  In the said 1st and 2nd embodiment, although the vertical rib 3 is not protrudingly provided in the large diameter part 101 which comprises the surrounding wall 1, it is not limited to this, For example, the vertical rib 3 is made into a large diameter part. It may be formed so as to hang from 101 to the lower peripheral wall portion 11. That is, you may make it form the vertical rib 3 in the surrounding wall 1 whole. If it does in this way, the molding space which shape | molds the said container will become the aspect which the vertical rib shaping | molding space 87 which forms the vertical rib 3, and the large diameter part shaping | molding space 94 connected, and the lower surrounding wall part shaping | molding space 84 and the upper surrounding wall part Similarly to the molding space 85, the resin flowing in the vertical rib molding space 87 starts and spreads in the large-diameter portion molding space 94, and the large-diameter portion 101 can also be formed thin.

  In said 1st embodiment, although circumferential ridge 20 (20a, 20b) was comprised in the circular annular shape, it is not limited to this, For example, circumferential ridge 20 (20a, 20b) is as follows. Of course, it may be formed in an elliptical annular shape or a polygonal annular shape such as a rectangular shape.

  In the second embodiment, the radial ridges 22 (first radial ridges 22a, second radial ridges 22b) and the inner diameter so as to be substantially perpendicular to the circumferential ridges 20 (20a, 20b). The direction ridges 21 are connected to the circumferential ridges 20 and the connecting portions are squared (bent). However, the present invention is not limited to this. For example, as shown in FIG. The connecting portions of the radial ridges 22 (first radial ridges 22a and second radial ridges 22b) and the inner radial ridges 21 with respect to 20 (20a, 20b) are rounded (R). Also good. Thus, if the connection portion is rounded, the communication portions of the inner radial ridge forming space 97, the circumferential ridge forming space 99, and the radial ridge forming space 98 can be rounded, Pressure loss due to switching of the resin flow direction in the radial ridge forming space 97, the circumferential ridge forming space 99, and the radial ridge forming space 98 can be reduced, and a smoother resin flow can be realized. can do.

The front view containing the partial cross section of the heat insulation container concerning 1st and 2nd embodiment of this invention is shown. The expanded sectional view of the part where the upper part peripheral wall part and lower part peripheral wall part concerning 1st and 2nd embodiment were connected via the connection part is shown. It is a partial cross section of the vertical rib and thin wall part which concern on 1st and 2nd embodiment, Comprising: II sectional drawing in FIG. 2 is shown. It is explanatory drawing for demonstrating the aspect of the circumferential protrusion with respect to the bottom part which concerns on 1st embodiment, an inner radial protrusion, and a radial protrusion (a 1st radial protrusion, a 2nd radial protrusion). II-II sectional drawing in FIG. 1 is shown. The partial sectional view of the circumferential ridge, the inner radial ridge, and the radial ridge (first radial ridge, second radial ridge) according to the first and second embodiments is shown. It is explanatory drawing of the shaping | molding space which shape | molds the heat insulation container concerning 1st and 2nd embodiment, Comprising: Sectional drawing of the 1st type | mold and 2nd type | mold of an injection molding apparatus is shown. The partially expanded sectional view of the part which the upper surrounding wall part shaping | molding space concerning 1st and 2nd embodiment and the lower surrounding wall part shaping | molding space connected via the connection part shaping | molding space is shown. FIG. 6 is a partial cross section of the vertical rib forming space and the thin peripheral wall forming space according to the first and second embodiments, and shows a III-III cross-sectional view in FIG. 6. Circumferential ridge forming space, inner radial ridge forming space and radial ridge forming space for the bottom forming space according to the first embodiment (first radial ridge forming space, second radial ridge forming space) It is explanatory drawing for demonstrating the aspect of this, Comprising: IV-IV sectional drawing in FIG. 6 is shown. Cross sections of circumferential ridge forming space, inner radial ridge forming space and radial ridge forming space (first radial ridge forming space, second radial ridge forming space) in the first and second embodiments. The figure is shown. Bottom forming space, circumferential ridge forming space, inner radial ridge forming space and radial ridge forming space according to the first embodiment (first radial ridge forming space, second radial ridge forming space) (B) shows the flow distribution of the resin in the bottom molding space and the inner radial projection forming space when the resin is injected from a predetermined position, (b) Indicates the flow distribution when the resin flows from the bottom molding space and the inner radial projection forming space into the circumferential projection, and (C) indicates the first diameter from the bottom molding space and the inner radial projection forming space. (D) shows the resin flow distribution from the bottom molding space and the inner radial projection forming space to the second radial projection forming space. It is explanatory drawing of the flow distribution of the resin in the lower surrounding wall part shaping | molding space and vertical rib shaping | molding space concerning 1st and 2nd embodiment, Comprising: (a) is in a thin-walled surrounding wall part shaping | molding space and a vertical rib shaping | molding space. (B) and (c) show the resin flow distribution in the thick peripheral wall portion forming space and the vertical rib peripheral wall portion. It is explanatory drawing for demonstrating the aspect of the circumferential direction ridge with respect to the bottom part which concerns on 2nd embodiment, an inner side radial direction ridge, and a radial direction ridge (a 1st radial direction protrusion, a 2nd radial direction protrusion). II-II sectional drawing in FIG. 1 is shown. Circumferential ridge forming space, inner radial ridge forming space and radial ridge forming space (first radial ridge forming space, second radial ridge forming space) with respect to the bottom forming space according to the second embodiment. It is explanatory drawing for demonstrating the aspect of this, Comprising: IV-IV sectional drawing in FIG. 6 is shown. Bottom forming space, circumferential ridge forming space, inner radial ridge forming space and radial ridge forming space (first radial ridge forming space, second radial ridge forming space) according to the second embodiment (B) shows the flow distribution of the resin in the bottom molding space and the inner radial projection forming space when the resin is injected from a predetermined position, (b) Indicates the flow distribution when the resin flows from the bottom molding space and the inner radial projection forming space into the circumferential projection, and (C) indicates the first diameter from the bottom molding space and the inner radial projection forming space. (D) shows the resin flow distribution from the bottom molding space and the inner radial projection forming space to the second radial projection forming space. Explanatory drawing for demonstrating the aspect of the circumferential direction protrusion and radial direction protrusion (1st radial direction protrusion, 2nd radial direction protrusion) with respect to the bottom part which concerns on other embodiment is shown. Explanatory drawing for demonstrating the aspect of the inner side radial direction protruding item | line with respect to the bottom part which concerns on another embodiment, and a protruding item | line is shown. Furthermore, the explanatory view for demonstrating the aspect of the circumferential direction protruding item | line with respect to the bottom part which concerns on another embodiment, an inner side radial direction protruding item | line, and a radial direction protruding item | line (1st radial direction protruding item | line, 2nd radial direction protruding item | line) is shown. .

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Peripheral wall, 2 ... Bottom part, 3 ... Vertical rib, 10 ... Upper peripheral wall part, 11 ... Lower peripheral wall part, 12 ... Connection part, 13 ... Large diameter part, 14 ... Peripheral wall main-body part, 15 ... Thin-walled peripheral wall part, 16 ... Thick-walled peripheral wall portion, 20 (20a, 20b) ... circumferential ridge, 21 ... inner radial ridge, 22 ... radial ridge, 22a ... first radial ridge, 22b ... second radial ridge, 80 ... Cavity, 81a ... First mold, 81b ... Second mold, 82 ... Core, 83 ... Bottom molding space, 84 ... Lower circumferential wall molding space, 85 ... Upper circumferential wall molding space, 86 ... Connecting molding space, 87 ... vertical rib forming space, 89 ... reinforcing piece forming space, 90 ... thin peripheral wall forming space, 91 ... thick peripheral wall forming space, 92 ... reinforcing part forming space, 93 ... peripheral wall main body forming space, 94 ... large diameter part Forming space, 95 ... Flange part forming space, 96 ... Sprue part, 97 ... Inside radial ridge forming sky 98 ... Radial ridge forming space, 98a ... First radial ridge forming space, 98b ... Second radial ridge forming space, 99a, 99b ... Circumferential ridge forming space, 100 ... Flange, 100a, DESCRIPTION OF SYMBOLS 100b ... Single part, 100c ... Connection part, 101 ... Large diameter part, 102 ... Perimeter wall main-body part, 103 ... Upper connection part, 104 ... Reinforcement piece, 110 ... Thin-walled peripheral wall part, 111 ... Thick-walled peripheral wall part

Claims (5)

  A cylindrical peripheral wall, and a bottom portion that closes an opening on one end of the peripheral wall, the peripheral wall and the bottom portion being a container formed by injecting resin from a predetermined position of the bottom portion during molding, and an outer surface of the bottom portion And at least one of the inner surface, a plurality of circumferential ridges extending in the circumferential direction, and a plurality of circumferential ridges, with one end connected to the circumferential ridge and the other end extending toward the circumferential wall. A container provided with a radial ridge, wherein the circumferential ridge and the radial ridge are formed integrally with a bottom portion.   At least one of the outer surface and the inner surface of the bottom is provided with a plurality of inner radial ridges extending from the circumferential ridge toward a predetermined position, and one end of each inner radial ridge is concentrated at the predetermined position. On the other hand, the container according to claim 1, wherein the other end is connected to the circumferential ridge at a position displaced in the circumferential direction with respect to a connection position of the radial ridge to the circumferential ridge.   A plurality of the circumferential ridges are formed at a predetermined interval in the radial direction of the peripheral wall with the predetermined position as the center, and the radial ridges are first radial ridges connecting the circumferential ridges. The container of Claim 1 or 2 comprised by the 2nd radial direction protruding item | line which connects a strip | line and the circumferential direction protruding item | line and a surrounding wall.   The container according to claim 3, wherein the first radial ridge and the second radial ridge are displaced in a circumferential direction at a connection position with respect to the circumferential ridge.   2. A plurality of vertical ribs extending in a vertical direction are radially formed on an outer peripheral surface of the peripheral wall, and the radial protrusions are connected to the peripheral wall so as to coincide with a formation position of a lower end of the vertical rib. The container in any one of thru | or 4.

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