JP3730819B2 - Molding structure for the bottom and bottom molding of folding containers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bottom part of a folding container and a bottom part molding die structure in which four side walls arranged so as to surround the bottom part can be folded so as to overlap the bottom part.
[0002]
[Prior art]
Conventionally, a fold consisting of a long side wall connected to an opposing long side portion of a rectangular bottom by an appropriate hinge connection and a short side wall connected to an appropriate short side portion of the bottom portion by an appropriate hinge connection. Containers are known (for example, Japanese Patent Application Laid-Open No. 8-318939), and in the folded state, the short side wall is folded on the bottom, and further, the long side wall is further folded. Then, the folded long side wall is set up vertically with respect to the bottom, and then the folded short side wall is set up vertically with respect to the bottom so as to be assembled into a box-type container. ing.
[0003]
[Problems to be solved by the invention]
In the conventional folding container described above, a card insertion and a label affixing part are provided on the short side wall and the long side wall, and in the folded state of the folding container in which the short side wall and the long side wall are folded, the card and the label are affixed. There was a problem that could not.
[0004]
In addition, when the side wall of the folding container has a high height at the bottom of the bottom part attached via a hinge, the strength of the mold part for molding such a high rise is weak, There were problems such as damage.
[0005]
The objective of this invention is solving the subject which the mold part structure for the bottom part and bottom part shaping | molding of the conventional folding container mentioned above has.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention firstly, from a state assembled in a box shape, first, a short side wall that is folded down so as to overlap the bottom, and then first. In the bottom part of the folding container composed of the long side wall that is folded down so as to overlap the fallen short side wall, the bottom plate, the opposed long side part to which the long side wall is hinged, and the height lower than the long side part And forming the long side portion of the bottom portion having an opposing short side portion to which the short side wall is hinge-coupled into a double structure portion composed of an inner wall, a horizontal wall and an outer wall, and the short side portion. On the outer surface of the outer wall that constitutes the double-structure part of the long side portion having a higher height , a concave portion for printing and labeling is formed by partially reducing the thickness of the outer wall , secondly, phase and the bottom plate, the long side wall is hinged The long side portion of the bottom portion, which has a long side portion that is lower than the long side portion and has an opposing short side portion to which the short side wall is hinged, includes an inner wall, a horizontal wall, and an outer wall. While forming into a double structure part, on the outer surface of the outer wall constituting the double structure part of the long side part higher in height than the short side part, by partially reducing the thickness of the outer wall, A bottom molding mold structure for integrally molding a bottom portion of a folding container in which a concave portion for printing and labeling is molded with a synthetic resin by injection molding, wherein the long side is higher than the short side portion. Projecting horizontally from the upper part of the mold surface for molding the outer wall constituting the double structure part on the upper side surface of the convex part for molding the double wall internal space of the double structure part of the part The horizontal projections are in contact with each other.
[0007]
【Example】
Examples of the present invention will be described below. However, the present invention is not limited to these examples as long as the gist of the present invention is not exceeded.
[0008]
Reference numeral 1 denotes a bottom portion having a rectangular planar shape, which is integrally molded with a synthetic resin using an injection molding machine. The long side wall 2 faces the bottom portion 1 through an appropriate hinge connection. Similarly, the short side walls 3 are connected so as to face each other via an appropriate hinge connection. The long side wall 2 and the short side wall 3 are also integrally molded with synthetic resin using an injection molding machine.
[0009]
As shown in FIG. 1, in order to fold a folding container assembled in a box shape, first, the short side wall 3 is brought down inside the folding container, as shown in FIG. , Over the bottom 1. Then, similarly, the long side wall 2 is brought down inside the folding container and is superimposed on the bottom 1 and the short side wall 3 as shown in FIG. Conversely, to assemble from the folded state shown in FIG. 3 as shown in FIG. 1, the long side wall 2 overlaid on the bottom 1 and the short side wall 3 stands vertically. Then, the short side wall 3 is set up vertically to assemble the folding container into a box shape.
[0010]
Immediately above the lower end of the long side wall 2, a lower horizontal rib 2 a extending in the horizontal direction is formed on the outside, and is formed by a lower surface 2 a ′ of the lower horizontal rib 2 a and an outer surface 2 b of the long side wall 2. Vertical ribs 2c are formed at the corners at predetermined intervals as required, and the vertical ribs 2c are configured such that their tips are located inside the lower horizontal ribs 2a.
[0011]
The bottom portion 1 is composed of a bottom plate 1a having reinforcing ribs 1a 'running vertically and horizontally on the lower surface, a long side portion 1b, and a short side portion 1c having a height lower than that of the long side portion 1b. The long side portion 1b includes an inner wall 1d extending substantially vertically upward from an edge on the long side portion 1b side of the bottom plate 1a, a horizontal wall 1e extending outward from the upper end of the inner wall 1d, and a horizontal wall. 1e has an outer wall 1f extending substantially vertically downward from the end of the inner wall 1d to the middle of the inner wall 1d. The long side 1b is formed by the inner wall 1d, the horizontal wall 1e, and the outer wall 1f. It is configured as a double structure portion W. In addition, in the double wall internal space 1g surrounded by the inner wall 1d, the horizontal wall 1e, and the outer wall 1f, an appropriate number of spaces are provided in the double wall internal space 1g along the length direction of the long side portion 1b. A partition rib 1h is formed for partitioning.
[0012]
Moreover, the vertical protrusion 1i is protrudingly provided by the upper surface of the horizontal wall 1e which comprises the double structure part W of the bottom part 1 except the both ends of the long side part 1b as needed. When the folding container is assembled in a box shape, the vertical ribs 2c formed at the corners of the lower horizontal rib 2a and the outer surface 2b of the long side wall 2 described above are in contact with the protruding portion 1i. Has been. When the folding container is assembled, the vertical rib 2c of the long side wall 2 comes into contact with the ridge portion 1i formed on the upper surface of the horizontal wall 1e constituting the double structure portion W of the bottom portion 1, whereby the long side wall Since 2 does not rotate outward any more, it is possible to prevent the hinge connecting the bottom 1 and the long side wall 2 from being damaged. Further, when the folding container is assembled in a box shape, the lower surface 2a ′ of the lower horizontal rib 2a of the long side wall 2 is formed on the horizontal wall 1e constituting the double structure portion W of the bottom portion 1. Since it is configured to be placed on the upper end 1i ′ of 1i, even if a load is applied to the long side wall 2 from above, this load is placed on the ridge 1i and the ridge 1i of the bottom 1. Since it is hung on the lower horizontal rib 2a of the placed long side wall 2 and does not reach the hinge connecting the bottom 1 and the long side wall 2, it is possible to prevent the hinge connecting the bottom 1 and the long side wall 2 from being damaged. it can.
[0013]
4 is an appropriate number of horizontal drain holes drilled in the upper part of the outer wall 1 f constituting the double structure W of the bottom 1, and 5 is located below the drain hole 4. It is a concave part for printing and labeling formed on the outer surface of the outer wall 1f, and is formed over almost the entire region of the outer wall 1f in the length direction. Thus, by forming the drain hole 4 in the outer wall 1f constituting the double structure portion W of the bottom portion 1, in the double wall internal space 1g of the double structure portion W of the folded container in the folded state, Even if rainwater, washing water, etc. accumulate, rainwater, washing water, etc. will be discharged from the drain hole 4 formed in the outer wall 1f. As described above, the double wall internal space 1g is partitioned into a plurality of spaces by the partition ribs 1h, so that at least one drain hole 4 is formed for each space partitioned by the partition ribs 1h. Will be.
[0014]
In addition, a label sticking portion and a card slot are disposed on the short side wall and the long side wall, and further, a concave portion 5 for printing and label sticking is formed on the outer surface of the outer wall 1f constituting the double structure portion W of the bottom portion 1. Therefore, identification of various types of information such as the type and destination of articles accommodated in the folding container is easier and more reliable.
[0015]
Furthermore, if the size of the folding container is different, in other words, if the size of the long side wall 2 or the short side wall 3 is different, the position of the label affixing part or card slot provided on the long side wall 2 or the short side wall 3 is large. Although there may be different cases, even if the size of the folding container is different, the position of the outer wall 1 f of the bottom portion 1, particularly the height thereof, does not vary greatly. Accordingly, the printing and labeling concave portion 5 formed on the outer surface of the outer wall 1f of the bottom portion 1 is read by the reading sensor of the reader disposed near the conveying device while being conveyed by the conveying device such as a belt conveyor. If the printed or affixed label is read, even if the size of the folding container is different, the position of the concave portion 5 for printing and labeling does not vary greatly, so it is accommodated in the folding container by the reader. The reading of various types of information such as the type of goods and the destination is accurately and reliably performed. Therefore, it is possible to prevent the reading from failing because the positions of the label attaching portions are different, and it is not necessary to change the position of the reading sensor of the reader depending on the size of the folding container.
[0016]
Next, with reference to FIG. 5, a mold structure and the like when the double structure portion W of the bottom portion 1 is injection molded will be described.
[0017]
M is a fixed mold, and the fixed mold M includes a surface m1 that forms the upper surface of the bottom plate 1a, a surface m2 that forms the inner surface of the inner wall 1d, and a portion that is located on the inner side of the protrusion 1i of the horizontal wall 1e. It has a surface m3 to be formed, an upper end 1i ′ of the ridge 1i, and a surface m4 that forms a portion located inside. N is a lower moving mold disposed below the fixed mold M, and the lower moving mold N has a surface n1 and an inner wall 1d forming a lower surface on which the reinforcing rib 1a ′ of the bottom plate 1a of the bottom portion 1 is suspended. Of the horizontal wall 1e, a surface n3 which forms the lower surface of the horizontal wall 1e, and a surface n4 which forms the inner surface of the outer wall 1f. A convex portion N ′ for forming is formed. P is a horizontal movement mold, and the horizontal movement mold P includes a surface p1 that forms the outer surface of the ridge portion 1i, a surface p2 that forms a portion located outside the ridge portion 1i of the horizontal wall 1e, and an outer wall. A horizontal surface formed of a cylinder, a prism, a truncated pyramid, a truncated cone, and the like from an upper portion of the surface p3 that forms the outer surface of the outer wall 1f of the horizontal moving mold P. A horizontal protrusion P ′ protruding in the direction is formed, and the end surface of the horizontal protrusion P ′ is in contact with the upper side surface of the convex portion N ′ formed on the lower moving mold N.
[0018]
By pouring molten resin into a mold space S surrounded by the above-described fixed mold M, lower moving mold N, and horizontal moving mold P through a runner M ′ formed in the fixed mold M, FIG. The long side portion 1b of the bottom portion 1 as shown in FIG.
[0019]
By the way, in the above-described embodiment, the horizontal protrusion P ′ protrudes from the upper part of the surface p3 that forms the outer surface of the outer wall 1f of the horizontal movement mold P, and the end surface of the horizontal protrusion P ′ moves downward. Since it is configured to be in contact with the upper side surface of the convex portion N ′ for forming the double-wall internal space 1g of the mold N, the molten resin enters the mold space S through the runner M ′. Even if the pressure of the injected molten resin is applied to the convex portion N ′, the convex portion N ′ is supported by the horizontal protrusion P ′ formed on the horizontal movement mold P. 5, there is no tilting to the left. Therefore, the surface p3 that forms the outer surface of the outer wall 1f of the horizontal moving mold P and the surface n4 that forms the inner surface of the outer wall 1f of the lower moving mold N. Is always kept constant, so that the wall thickness of the inner wall 1d and the outer wall 1f constituting the double structure W of the bottom 1 is Therefore, it is possible to prevent a thin portion having a weak strength from being formed on the long side portion 1b constituting the bottom portion 1.
[0020]
In the embodiment shown in FIG. 6, instead of the above-described horizontal protrusion P ′, a vertical protrusion N ″ is provided on the upper surface of the convex portion N ′ of the lower moving mold N, and the vertical protrusion N ″ is fitted into a fitting recess M ″ provided on a surface m3 that forms a portion located on the inner side of the protrusion 1i of the horizontal wall 1e of the fixed mold M. The configuration is as described above. Thus, as described above, it is possible to prevent the convex portion N ′ of the lower moving mold N from tilting due to the pressure of the molten resin injected from the runner M ′ into the mold space S. Instead of the horizontal drain hole 4 described above, a drain hole 6 perpendicular to the horizontal wall 1e is formed as shown in FIG.
[0021]
As described above, the horizontal protrusion P ′ and the vertical protrusion N ″ are formed on the convex portion N ′ of the lower moving mold N in the horizontal moving mold P, and injected into the mold space S from the runner M ′. In order to prevent the convex portion N ′ of the lower moving mold N from being tilted due to the pressure of the molten resin to be formed, the outer wall 1f is provided with the concave portions 5 for printing and labeling. This is particularly effective when the thickness is reduced, and when the thickness of the outer wall 1f is reduced due to the provision of the recess 5 for printing and labeling, it is injected into the mold space S from the runner M '. When the lower moving mold N is tilted by the pressure of the molten resin and a thinner wall portion is formed on the outer wall 1f, the strength of the bottom portion 1 is further reduced, and the possibility of damage to the bottom portion 1 is further increased. Further, when the thickness of the convex portion N ′ of the lower moving mold N is reduced without changing the thickness of the outer wall 1f, the mold Since the lower moving mold N is more easily tilted by the pressure of the molten resin injected into the space S, the horizontal protrusion P ′ or the convex portion of the lower moving mold N is formed on the horizontal moving mold P as described above. Forming the vertical protrusion N ″ on N ′ is particularly effective in preventing tilting of the convex portion N ′ of the lower moving mold N.
[0022]
If necessary, a horizontal protrusion P ′ can be formed on the horizontal moving mold P, and a vertical protrusion N ″ can also be formed on the convex portion N ′ of the lower moving mold N. In this case, In this case, a horizontal drain hole 4 and a vertical drain hole 6 are formed in the outer wall 1f and the horizontal wall 1e, respectively.
[0023]
【The invention's effect】
Since the present invention has the above-described configuration, the following effects can be achieved.
[0024]
Since the concave part for printing and labeling is formed on the outer surface of the outer wall that constitutes the bottom double structure part, it is easier to identify various types of information such as the type and destination of articles contained in the folding container. And it will be sure.
[0025]
Since the concave portions for printing and label sticking are formed on the outer surface of the outer wall constituting the double structure portion at the bottom, printing and label reading by the reader can be performed accurately and reliably.
[0026]
Since the tilt of the convex portion of the lower moving mold N due to the pressure of the molten resin injected from the runner into the mold space can be prevented, the wall thickness of the inner wall and the outer wall constituting the double structure portion at the bottom is Therefore, it is possible to prevent a thin portion having a weak strength from being formed on the long side portion constituting the bottom portion.
[0027]
Even when the thickness of the convex part of the lower moving mold is reduced, the mold from the runner can be formed by forming a horizontal protrusion on the horizontal moving mold and a vertical protrusion on the convex part of the lower moving mold. Since the tilting of the convex portion of the lower moving mold N due to the pressure of the molten resin injected into the space can be prevented, the wall thickness of the inner wall and the outer wall constituting the bottom double structure portion is constant, and therefore Further, it is possible to prevent a thin portion having a weak strength from being formed on the long side portion constituting the bottom portion.
[Brief description of the drawings]
FIG. 1 is a perspective view of an assembled state of a folding container having a bottom according to the present invention.
FIG. 2 is a perspective view in the middle of folding of a folding container having a bottom according to the present invention.
FIG. 3 is a perspective view showing a folded state of a folding container having a bottom according to the present invention.
FIG. 4 is a vertical cross-sectional view of the long side portion of the bottom portion of the folding container of the present invention perpendicular to the longitudinal direction of the long side portion.
FIG. 5 is a vertical cross-sectional view of a bottom-forming mold structure for forming a long side part of the bottom of the folding container of the present invention.
FIG. 6 is a vertical cross-sectional view of another embodiment of the bottom molding mold structure for molding the long side of the bottom of the folding container of the present invention.
7 is a vertical cross-sectional view of the long side portion of the bottom portion of the folding container of the present invention perpendicular to the longitudinal direction of the long side portion similar to FIG. 4. FIG.
[Explanation of symbols]
M, N, P ... Mold W ... Double structure 1 ... Bottom 1b ... Long side 1d ... ... Inner wall 1e ... Horizontal wall 1f ... Outer wall 1g ... Double wall inner space 2 ... Long side wall 3 ... ···· Short side wall 5 ····························································

Claims (2)

Folding comprising a bottom and a short side wall that is firstly folded down so as to overlap the bottom from a state assembled in a box shape, and then a long side wall that is folded down so as to overlap the short side wall that has been tilted first. At the bottom of the container, a bottom plate, an opposing long side part to which the long side wall is hinged, and an opposing short side part having a height lower than the long side part and the short side wall being hinged. The outer wall forming the long side portion of the bottom having a double structure portion composed of an inner wall, a horizontal wall and an outer wall, and constituting a long side portion double structure portion having a height higher than the short side portion A bottom portion of a folding container integrally formed of synthetic resin, wherein a concave portion for printing and labeling is formed on the outer surface of the outer wall by partially reducing the thickness of the outer wall . The said long side part of the bottom part which has a baseplate, the opposing long side part by which a long side wall is hinge-joined, and the opposing short side part whose height is lower than this long side part, and a short side wall is hinge-joined Is formed into a double structure portion composed of an inner wall, a horizontal wall and an outer wall, and the outer surface of the outer wall constituting the double structure portion having a long side higher than the short side portion is formed on the outer wall of the outer wall. A bottom molding mold structure for integrally molding the bottom of a folding container in which concave portions for printing and labeling are molded by synthetic molding by injection molding by partially reducing the wall thickness, To form the outer wall constituting the double structure portion on the upper side surface of the convex portion for forming the double wall internal space of the double structure portion of the long side portion having a height higher than the short side portion The horizontal projections projecting horizontally from the top of the mold surface Bottom mold structure folding container according to claim 1, characterized in that it is.

Images