JP5425560B2 - Folding container - Google Patents

Description

  The present invention relates to a folding container for storing, transporting and transporting various articles.

  The folding container is formed of a bottom, one opposite side wall hinged to the opposite side of the bottom, and another opposite side wall hinged to the other opposite side of the bottom. The folding container assembled in a box shape falls one opposing side wall standing upright so as to overlap the bottom, and then the other side wall standing upright in the vertical state, It is comprised so that it may be folded up by falling so that it may overlap with one opposing side wall which fell down so that it may overlap with a bottom part.

  In the folding container as described above, as an example, a folding container in which the side wall and the bottom portion are formed flat while maintaining the strength of the folding container and the entire side wall and the bottom portion are formed of foamed resin. It is disclosed in Patent Document 1.

  In addition, in the state assembled in the box shape, first, the opposite side wall that is tilted in the bottom direction is tilted later so that the one side wall is not inadvertently tilted in the bottom direction. A locking elastic piece formed on the other side wall, in which both ends of one opposing side wall that is tilted in the bottom direction are tilted later are formed. As an example, a folding container configured to be locked to a protruding portion is disclosed in Patent Document 2.

Japanese Patent Laid-Open No. 7-277328

Japanese Patent Laid-Open No. 2002-240822

  When the bottom and side walls of the folding container disclosed in Patent Document 2 described above are molded with foamed resin as described in Patent Document 1, the locking elastic piece formed on the other side wall is also foamed resin. Will be molded.

  The part molded with foamed resin is formed of a laminate consisting of an opposing skin layer and a foamed core layer sandwiched between the skin layers. The strength is improved compared to the solid part, but the impact strength is low. Also, there is a problem that elastic deformation is difficult. Therefore, when the above-mentioned locking elastic piece is molded with foamed resin, it becomes difficult to elastically deform the locking elastic piece, and when the corner portion of the side wall is molded with foamed resin, the impact strength is low. When the folding container falls or collides with another object, the side wall is damaged.

  An object of the present invention is to solve the problems of the conventional containers described above.

To achieve the above-mentioned object, the present invention provides a bottom portion, one opposing side wall that is first brought down from a state assembled in a box shape, and the other side that is turned down later from a state assembled in a box shape . In the folding container comprising opposing side walls, the side wall to be tilted first has a wall plate-like base part surrounded by an upper end horizontal flange, a lower end horizontal flange and an end vertical flange opposite to the upper side horizontal flange, The plate-like base is formed as a three-layer laminate including an outer wall skin layer, an inner wall skin layer, and a foamed core layer formed between the outer wall skin layer and the inner wall skin layer, and the end portion In the vicinity of the vertical flange, an elastic piece with a locking projection is formed, and the side wall to be tilted first is a fixed mold having a recessed mold fitting recess, a movable mold, , The recessed mold fitting recess The mold structure is configured to be injection-molded by a mold structure having a retractable mold fitted to the plate, and the mold structure is a plate formed between the movable mold and the retractable mold. Shaped base part forming space part, elastic piece forming space part formed between the movable mold and the fixed mold, opposite side wall parts of the movable mold and opposite side wall parts of the fixed mold Between the engaging member and the end vertical rib forming space formed between, the opposing side wall portion of the fixed mold forming the receding mold fitting recess, and the receding mold fitting recess. A vertical flange molding space formed between the vertical end face, and in the step of injecting the molten foamed resin into the molding space formed in the mold structure, the plate-like The gap between the base molding space, the gap between the elastic piece molding, and the engaging member / end vertical rib The gap between the forming space and the vertical flange forming space is configured to be substantially uniform, and the molding foam formed in the mold structure has a molten foam resin. When the mold is injected, the retractable mold is moved in the back direction to form the retractable mold fitting recess, thereby expanding the volume of the plate-like base forming space and the elastic piece. The short side wall plate-like base portion is formed of the outer wall skin layer, the inner wall, and the volume of the molding space portion, the engagement member / end vertical rib molding space portion, and the vertical flange molding space portion so as not to increase. Molded as a three-layer laminate consisting of a skin layer and a foam core layer formed between an outer wall skin layer and an inner wall skin layer, and the portions other than the short side wall plate-like base are in a solid solid state Is formed as follows.

  In a folding container comprising: a bottom; one opposing side wall hinged to opposite sides of the bottom; and another opposing side wall hinged to the other opposite side of the bottom. The one opposing side wall and / or the side wall plate-like base of the other opposing side wall between the outer wall skin layer, the inner wall skin layer, the outer wall skin layer and the inner wall skin layer. Since it is formed as a three-layer laminate comprising the formed foam core layer, and the portion other than the side wall plate-like base is formed in a quasi-solid state, the strength of the side wall plate-like base is improved, and as a result, the side wall Can be reinforced.

  Since the side wall plate-like base is configured to be surrounded by the pseudo solid, it is possible to prevent the impact strength of the side wall plate-like base from being lowered, and consequently the impact strength of the side wall is lowered. Can be prevented.

  Since the outer wall surface of the side wall is formed as a flat surface molded as an outer wall skin layer, the reinforcing rib formed on the conventional side wall can be omitted, and dust or the like adheres to the reinforcing rib. Therefore, the cleaning property of the folding container is improved.

  Since the outer wall surface of the side wall is formed as a flat surface molded as an outer wall skin layer, the reinforcing rib collides with another object or an object located in the vicinity of the conveying line, and the folding container is damaged. This can be prevented.

  Since the outer wall surface of the side wall is formed as a flat surface molded as an outer wall skin layer, the thickness of the side wall 3 can be reduced compared to the conventional side wall formed with reinforcing ribs. The folding height can be lowered, and therefore the folding height of the folded folding containers can be lowered, and the folding containers located above when stacking the folded folding containers can be lowered. However, it is possible to prevent the stacking operation from being hindered by being caught by the reinforcing ribs of the folding container located below.

FIG. 1 is a perspective view of the folding container of the present invention assembled in a box shape. FIG. 2 is a perspective view of a state in which the folding container of the present invention is folded. FIG. 3 is an exploded perspective view of the folding container of the present invention. FIG. 4 is a perspective view including a horizontal section in a state where the folding container of the present invention is assembled in a box shape. FIG. 5 is a perspective view including a vertical cross section of a short side wall constituting the folding container of the present invention. FIG. 6 is a partial horizontal sectional view of a mold structure for molding a short side wall constituting the folding container of the present invention. FIG. 7 is a partial horizontal cross-sectional view of a mold structure for molding a short side wall constituting the folding container of the present invention.

  First, the overall configuration of the folding container of the present application will be described with reference to FIGS.

  1 is a bottom portion having a substantially rectangular shape in plan view, a long side bank portion 1a is formed on the long side opposite to the bottom portion 1, and a short side opposite to the bottom portion 1 is short. A side bank portion 1b is formed. In the present embodiment, the long side bank portion 1a is formed lower than the short side bank portion 1b. As is well known, an appropriate number of female female portions H1 are formed on the long side bank portion 1a and the short side bank portion 1b, respectively.

  2 is a long side wall, and a known hinge male part H2 is formed on the long side wall 2. The hinge male part H2 formed on the long side wall 2 is formed on the long side bank part 1a of the bottom part 1. The long side wall 2 is configured to be hinged to the long side bank portion 1a of the bottom portion 1 by being connected to the hinge female portion H1.

  Reference numeral 3 denotes a short side wall. A hinge male portion H2 similar to the known hinge male portion H2 formed on the long side wall 2 is formed on the short side wall 3, and the hinge formed on the short side wall 3 is formed. By connecting the male part H2 to the hinge female part H1 formed on the short side bank part 1b of the bottom part 1, the short side wall 3 is hingedly connected to the short side bank part 1b of the bottom part 1. Has been.

  The long side wall 2 has an upper end horizontal flange 2a, a lower end horizontal flange 2b, and an end vertical flange 2c that connects both ends of the upper end horizontal flange 2a and the lower end horizontal flange 2b. The horizontally long long side wall plate-shaped base 2d surrounded by the upper end horizontal flange 2a and the end vertical flange 2c opposite to the lower end horizontal flange 2b has an outer wall surface (when the folding container is assembled into a box shape, the folding container Is formed on the skin layer (hereinafter, this skin layer is simply referred to as the outer wall skin layer and denoted by reference numeral 2d1), and the inner wall surface (the folding container is assembled in a box shape). The surface located inside the folding container) is also formed in a skin layer (hereinafter, this skin layer is simply referred to as an inner wall skin layer and denoted by reference numeral 2d2), and an outer wall skin. It is formed as a three-layer laminate comprising a foam core layer 2d3 formed between the layer 2d1 and the inner wall skin layer 2d2.

  On the outside of the end vertical flange 2c of the long side wall 2, a known long side wall side engagement member 2e is integrally connected to the end vertical flange 2c along the long side wall plate-like base 2d. The long side wall engaging member 2e is formed with an engaging protrusion 2e1 that is substantially perpendicular to the long side wall plate-like base 2d of the long side wall 2 and extends outward. Moreover, the hinge male part H2 mentioned above is connected integrally with the lower end horizontal flange 2b on the back surface of the lower end horizontal flange 2b.

  The short side wall 3 has an upper end horizontal flange 3a, a lower end horizontal flange 3b, and an end vertical flange 3c that connects both ends of the upper end horizontal flange 3a and the lower end horizontal flange 3b. The horizontally long short side wall plate-shaped base 3d surrounded by the upper end horizontal flange 3a and the end vertical flange 3c opposite to the lower end horizontal flange 3b has an outer wall surface (when the folding container is assembled into a box shape, the folding container Is formed on the skin layer (hereinafter, this skin layer is simply referred to as the outer wall skin layer, and denoted by reference numeral 3d1), and the inner wall surface (the folding container is assembled in a box shape). The surface located inside the folding container) is also formed in a skin layer (hereinafter, this skin layer is simply referred to as an inner wall skin layer, and denoted by reference numeral 3d2), and an outer wall skin. It is formed as a three-layer laminate including a foam core layer 3d3 formed between the layer 3d1 and the inner wall skin layer 3d2.

  The end vertical flange 3c of the short side wall 3 is provided with a known short side wall side engaging member 3e extending in the direction of the long side wall 2 substantially perpendicular to the short side wall plate-like base 3d, and the end vertical flange 3c. They are connected together. When the folding container is assembled in a box shape, the engaging protrusion 2e1 protruding from the long side wall engaging member 2e of the long side wall 2 is inserted into the short side wall engaging member 3e. A hole 3e1 is formed.

  A known elastic piece 3f is formed in the vicinity of the end vertical flange 3c of the short side wall 3. A folding container is box-shaped at the free end located on the end vertical flange 3c side of the elastic piece 3f. When assembled, a locking projection 3f1 projecting in the inner direction of the folding container is formed. Furthermore, the above-described hinge male portion H2 is integrally connected to the lower surface horizontal flange 3b on the back surface of the lower end horizontal flange 3b. Furthermore, the base portion of the elastic piece 3f is integrally formed with the end vertical flange 3c, and the elastic piece 3f includes an upper horizontal flange 3g1, a lower horizontal flange 3g2, an upper horizontal flange 3g1, and a lower horizontal flange 3g2. Is surrounded by a vertical flange 3g3.

  When the folding container having the above-described configuration is assembled into a box shape as shown in FIG. 1, a long hole is formed in the through-hole 3 e 1 of the short side wall side engaging member 3 e formed on the short side wall 3. The engaging protrusion 2e1 protruding from the long side wall engaging member 2e of the side wall 2 is inserted, and the locking protrusion 3f1 of the elastic piece 3f formed on the short side wall 3 is the long side wall of the long side wall 2. It is comprised so that it may contact | abut to the inner surface of the side engaging member 2e. Further, when the folding container assembled in a box shape is folded as shown in FIG. 2, first, the elastic piece 3f formed on the short side wall 3 is elastically deformed outward. The locking state between the locking protrusion 3f1 of the elastic piece 3f formed on the short side wall 3 and the long side wall side engaging member 2e of the long side wall 2 is released, and the long side wall 2 is tilted so as to overlap the bottom. Then, the folding container is configured to be folded as shown in FIG. 2 in such a manner that the short side wall 3 is tilted so as to overlap the previously tilted long side wall 2. Such a configuration of the folding container is well known, and thus detailed description thereof is omitted.

  In the following, the long side wall plate-like base 2d constituting the long side wall 2 is composed of an outer wall skin layer 2d1, an inner wall skin layer 2d2, and a foam core layer 2d3 formed between the outer wall skin layer 2d1 and the inner wall skin layer 2d2. A mold structure M for molding as a three-layered laminate and a short side wall plate-like base portion 3d constituting the short side wall 3, an outer wall skin layer 3d1, an inner wall skin layer 3d2, and an outer wall skin layer 3d1 A description will be given of a mold structure M for molding as a three-layer laminate including a foamed core layer 3d3 formed between the inner wall skin layer 3d2 and a long side wall plate-like base portion 2d constituting the long side wall 2. Since the mold structure M for molding the short side wall plate-like base 3d constituting the short side wall 3 is substantially the same, in the following, the mold structure for molding the short side wall 3 will be described with reference to FIG. And with reference to FIG.

  m1 is a known fixed mold, and m2 is a known movable mold. Since such a mold structure M is publicly known, detailed description thereof is omitted.

  A recessed portion (hereinafter referred to as a retracted mold fitting recessed portion) m3 is formed in a region of the fixed mold m1 facing the movable mold m2. The receding mold fitting recess m3 includes a flat bottom surface m3a, a flat ceiling surface (not shown) that is parallel to the bottom surface m3a and faces the bottom surface m3a, and a flat surface that is perpendicular to the bottom surface m3a and the ceiling surface. The side surface m3b and the back surface m3c are formed, and the retreat mold fitting recess m3 is opened on the movable mold m2 side.

  m4 is a cylinder disposed in the fixed mold m1, m5 is a reversible mold driven by the cylinder m4 so as to be movable back and forth in the direction of the movable mold m2, and the reversible mold m5 is retracted. It is configured to be fitted in the mold fitting recess m3.

  As shown in FIG. 6, a plate for forming a short side wall plate-like base portion 3d between the movable mold m2 and the retractable mold m5 fitted in the retractable mold fitting recess m3. A shaped base molding space v1 is formed. In addition, an elastic piece molding space v2 for molding the elastic piece 3f is formed between the movable mold m2 and the opposite side wall m1a of the fixed mold m1 that forms the retreat mold fitting recess m3. The elastic piece molding space v2 is formed by extending the plate-like base molding space v1 in the horizontal direction. Further, an engaging member for forming the short side wall side engaging member 3e and the end vertical rib 3c between the opposing side wall part m2a of the movable mold m2 and the opposing side wall part m1a of the fixed mold m1. An end vertical rib forming space v3 is formed, and the engaging member end vertical rib forming space v3 extends into the movable mold m2. Furthermore, the above-described upper horizontal flange 3g1 is disposed between the opposing side wall part m1a of the fixed mold m1 forming the retreat mold fitting recess m3 and the opposing vertical end surface m5a of the retreat mold fitting recess m3. And a vertical flange forming space v4 for forming a vertical flange 3g3 that connects the lower horizontal flange 3g2 to each other. A molding space for molding the upper horizontal flange 3g1 and the lower horizontal flange 3g2 described above is formed, and for molding the hinge male portion H2 suspended from the lower horizontal flange 3b. Although a space is also formed, the formation of such a molding space is well known, and a description thereof will be omitted.

  FIG. 6 shows the position of the retractable mold m5 disposed in the retractable mold fitting recess m3 at the stage of injecting the molten foamed resin into the molding space formed in the mold structure M. As shown, the gap between the plate-shaped base molding space v1 formed between the retractable mold m5 and the movable mold m2 is the same as the gap between the other molding spaces v2 to v4 and the like. In this way, adjustment is made by operating the cylinder m4. With this configuration, all of the molding spaces are configured so that the gaps are substantially uniform.

  From the state shown in FIG. 6, the cylinder m4 is operated to move the retractable mold m5 in the direction of the back surface m3c that forms the retractable mold fitting recess m3. Thus, it is comprised so that the volume of the space part v1 for plate-shaped base part shaping | molding formed between the reversible metal mold | die m5 and the movable metal mold | die m2 can be expanded.

  Next, a process of injection molding the short side wall 3 using the mold structure M having the above-described configuration will be described.

  When the molten foam resin is injected into the mold structure M, as described above, the position of the retractable mold m5 arranged in the retractable mold fitting recess m3 is the retractable mold m5 and the movable mold. It is adjusted by the cylinder m4 so as to be substantially the same as the gap between the plate-shaped base portion forming space v1 formed between m2 and the other forming spaces v2 to v4.

  Next, as is known, molten foam resin is injected from the gate. After the molten foam resin is injected into the above-described plate-like base molding space v1 or other molding spaces v2 to v4, etc., the cylinder m4 is actuated to insert the retractable mold m5 into the retractable mold. It moves to the back m3c direction which forms the joint recessed part m3, and expands the volume of the space part v1 for plate-shaped base part shaping | molding. In this way, the short side wall 3 is injection molded.

  As described above, when the short side wall 3 is injection-molded, the volume of the molding space portion of the molding space portions v2 to v4 other than the plate-like base portion molding space v1 does not increase. Compared with the plate-like base molding space v1 in which the volume of the molding space expands, the foaming agent hardly foams and becomes a substantially solid state (hereinafter, substantially solid). A solid state is called a pseudo-solid state.) Thus, it is formed so as to surround the upper end horizontal flange 3a, the lower end horizontal flange 3b, the end vertical flange 3c, the elastic piece 3f, the hinge male part H2, and the elastic piece 3f constituting the short side wall 3. The upper horizontal flange 3g1, the lower horizontal flange 3g2, and the vertical flange 3g3 are formed in a pseudo solid state.

  On the other hand, the volume of the plate-like base molding space v1 is increased by moving the retractable mold m5 in the direction of the back surface m3c forming the retractable mold fitting recess m3 by the operation of the cylinder m4. Accordingly, the foaming rate is higher than that of the molten foamed resin in which the foaming agent is injected into the other molding spaces v2 to v4. The short side wall plate-like base 3d of the short side wall 3 thus injection-molded is an outer wall skin layer 3d1, an inner wall skin layer 3d2, and a foam core layer formed between the outer wall skin layer 3d1 and the inner wall skin layer 3d2. It will be molded as a three-layer laminate composed of 3d3.

  As described above, a molding space other than the plate-like base molding space v1, that is, an elastic piece molding space v2, an engagement member / end vertical rib molding space v3, and a vertical rib molding space. In v4 and the like, since the volume of the molding space does not increase, it is molded into a pseudo-solid state in which almost no foaming agent is foamed. Accordingly, the elastic deformation of the elastic piece 3f formed in this way is not hindered, and the upper horizontal flange 3a, the lower horizontal flange 3b, the vertical edge flange 3c, etc. other than the short side wall plate-like base 3d are also provided. Since it is molded into a pseudo-solid state, when the folding container falls, the impact strength of the upper horizontal flange 3a, the lower horizontal flange 3b, the end vertical flange 3c, etc. that collides with the floor or the like is reduced. This can be prevented.

  By molding the short side wall 3 using the mold structure M as described above, the short side wall plate-like base 3d of the short side wall 3 becomes the outer wall skin layer 3d1, the inner wall skin layer 3d2, and the outer wall skin layer 3d1. And a foamed core layer 3d3 formed between the inner wall skin layer 3d2 and thus the strength of the short side wall plate-like base 3d is improved. The strength of the will be improved.

  Further, the short side wall plate-like base portion 3d of the short side wall 3 is composed of three layers including an outer wall skin layer 3d1, an inner wall skin layer 3d2, and a foam core layer 3d3 formed between the outer wall skin layer 3d1 and the inner wall skin layer 3d2. Since the outer wall surface of the short side wall 3 is a flat surface formed as the outer wall skin layer 3d1, and the reinforcing ribs extending vertically and horizontally are omitted as in the conventional short side wall, It is possible to prevent dust and the like from adhering to the reinforcing rib, and thus the cleaning property of the folding container is improved.

  Furthermore, the outer wall surface of the short side wall 3 is a flat surface formed as the outer wall skin layer 3d1, and the reinforcing ribs extending vertically and horizontally like the conventional short side wall are omitted. It is possible to prevent the folding container from being damaged by colliding with the object in the vicinity of the object or the conveying line.

  Furthermore, in order to improve the strength of the short side wall 3, the thickness of the short side wall 3 can be reduced as compared with the conventional short side wall 3 in which reinforcing ribs are formed. The folding height of the folded folding container can be lowered, and the folded folding container can be moved downward when stacking the folded folding container. It is possible to prevent the stacking operation from being hindered by being caught on the reinforcing ribs of the folding container.

  Still further, the short side wall plate-like base portion 3d has an upper end horizontal flange 3a, a lower end horizontal flange 3b, an end vertical flange 3c, a vertical rib 3f2 formed integrally with a base portion of the elastic piece 3f, and an elastic shape. Since it is surrounded by the upper horizontal flange 3g1 located above the piece 3f, the lower horizontal flange 3g2 located below the elastic piece 3f, and the vertical flange 3g3, the impact strength of the short side wall plate-like base 3d is reduced. As a result, it is possible to prevent the impact strength of the short side wall 3 from being lowered.

  Similar to the short side wall 3 described above, the long side wall plate-like base 2d of the long side wall 2 is also foam formed between the outer wall skin layer 2d1, the inner wall skin layer 2d2, and the outer wall skin layer 2d1 and the inner wall skin layer 2d2. It can be formed as a three-layer laminate including the core layer 2d3.

M ········································································································································· ·····································································································································································・ ・ ・ ・ ・ ・ Bottom part・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Long side wall 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Short side wall 3d ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Short side wall plate base 3d1・ ・ ・ ・ ・ ・ Outer wall skin layer 3d2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner wall skin layer 3d3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Foamed core layer

Claims (1)

In a folding container comprising a bottom, one opposing side wall that is first tilted from a state assembled in a box shape, and another opposite side wall that is tilted later from a state assembled in a box shape , The fallen side wall has a wall plate-like base portion surrounded by an upper end horizontal flange and an end vertical flange opposite to the lower end horizontal flange, and the wall plate-like base portion includes an outer wall skin layer and an inner wall skin layer. And a three-layer laminate comprising a foam core layer formed between the outer wall skin layer and the inner wall skin layer, and a locking projection is provided in the vicinity of the end vertical flange. The side wall to be tilted first is fitted to the fixed mold, the movable mold, and the retreat mold fitting recess having the retreat mold fitting recess formed therein. Mold with retractable mold The mold structure has a plate-like base molding space formed between the movable mold and the retractable mold, and is fixed to the movable mold. The elastic piece forming space formed between the mold and the engaging member / end perpendicular formed between the opposed side wall of the movable mold and the opposed side wall of the fixed mold. Vertical flange forming space formed between the rib forming space, the opposing side wall portion of the fixed mold forming the receding mold fitting recess, and the opposing vertical end surface of the receding mold fitting recess. In the step of injecting the molten foamed resin into the molding space formed in the mold structure, the gap between the plate-like base molding space and the elastic piece molding Space gap, engagement member / end vertical rib forming space gap, and vertical flange forming The gap with the space is configured to be substantially uniform, and when the molten foam resin is injected into the molding space formed in the mold structure, the retractable mold Is moved in the back direction to form the retreat mold fitting recess, thereby expanding the volume of the plate-like base molding space and making the elastic piece molding space and the engaging member / end perpendicular. By configuring so that the volume of the rib forming space and the vertical flange forming space is not increased, the short side wall plate-shaped base includes an outer wall skin layer, an inner wall skin layer, an outer wall skin layer, and an inner wall skin layer. Folding container characterized in that it is molded as a three-layer laminate comprising a foamed core layer formed between the two, and the portions other than the short side wall plate-like base are molded as a solid solid state. .

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