JP2011046381A - Container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve strength of a bottom part where the strength is required in comparison with the impact strength, and to enhance the impact strength of corner parts of the bottom part by using a pseudo-solid layer for reinforcing the peripheral wall of the bottom part. <P>SOLUTION: In a container C consisting of the bottom part c4 and a side wall c1, the bottom part is formed as a laminated body comprising an upper part skin layer c4a, a lower part skin layer c4b, and a foamed core layer c4c placed between the upper part skin layer and the lower part skin layer, and the pseudo-solid layer c5 for reinforcing the peripheral wall of the bottom part is formed on the peripheral wall part being the side face of the bottom part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  Conventionally, after injecting a molten foamed resin containing a foaming agent into a molding space formed in the mold, one mold is retracted to expand the molding space in the mold, The container is foamed and the surface layer of the container is formed into a thin skin layer in which the foaming agent hardly foams, and the portion sandwiched between the skin layers, the so-called core layer, is foamed more than the skin layer. The container made into the foam core layer which was made is disclosed by patent document 1 as an example.

JP 2008-254302 A

  As for the conventional container mentioned above, the whole container is shape | molded by the foaming core layer pinched | interposed by the inner skin layer, the outer skin layer, and the inner skin layer and the outer skin layer.

  By the way, it is known that the impact strength is small in the portion composed of the skin layer and the foamed core layer sandwiched between the skin layers because the skin layer is thin.

  When a container is dropped or during the transfer of a container, such a part may be damaged if an impact is applied to the corner formed by the bottom and side walls of the container or the tip of the top flange. was there.

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

  In order to achieve the above-mentioned object, the present invention provides a container comprising a bottom and a side wall. First, the bottom comprises an upper skin layer, a lower skin layer, the upper skin layer, and the lower skin layer. It is formed as a laminate composed of sandwiched foam core layers, and a bottom solid wall reinforcing pseudo-solid layer is formed on the bottom peripheral wall portion. Second, the foaming rate of the bottom peripheral portion is determined. In the third embodiment, a bottom partition rib in a pseudo solid state is formed in the bottom portion.

  In a container comprising a bottom and a side wall, the bottom is formed as a laminate comprising an upper skin layer, a lower skin layer, and a foamed core layer sandwiched between the upper skin layer and the lower skin layer, and the bottom portion Since the bottom solid wall reinforcing pseudo solid layer is formed on the side of the base, it is possible to improve the strength of the bottom where the strength is required compared to the impact strength. The impact strength of the part can be increased.

  Since the foaming rate of the outer peripheral part of the bottom part is configured to be lower than the foaming rate of the central part region of the bottom part, the strength and impact strength of the bottom part can be further improved.

  Since the bottom partition rib in a pseudo solid state is formed in the bottom, the strength and rigidity of the bottom can be increased.

FIG. 1 is a vertical cross-sectional view of a mold structure for molding the container of the present invention. FIG. 2 is a vertical sectional view of a mold structure for molding the container of the present invention. FIG. 3 is a partially enlarged vertical sectional view of the mold structure shown in FIG. FIG. 4 is a perspective view including a partial vertical section of the container of the present invention. FIG. 5 is a partially enlarged vertical sectional view showing a state where molten foam resin is injected into the cavity of the mold structure shown in FIG. FIG. 6 is a partially enlarged vertical sectional view of the container of the present invention. FIG. 7 is a vertical sectional view of a mold structure for molding a container according to another embodiment of the present invention. FIG. 8 is a partially enlarged vertical sectional view of the mold structure shown in FIG. FIG. 9 is a perspective view including a partial vertical section of a container according to another embodiment of the present invention. FIG. 10 is a partial vertical sectional view of a mold structure for forming a container according to still another embodiment of the present invention. FIG. 11 is a partially enlarged vertical sectional view showing a state where molten foam resin is injected into the cavity of the mold structure shown in FIG. FIG. 12 is a partially enlarged vertical sectional view of a container according to still another embodiment of the present invention.

  First, a mold for injection molding the container of the present application will be described with reference to FIGS.

  In FIG. 1, m1 is a fixed mold, m2 is a movable mold, and m3 is a side slide mold. m4 is a mounting plate for the fixed mold m1, m5 is a mounting plate for the movable mold m2, and such a mold structure M is well known, and therefore detailed description thereof is omitted.

  A recessed portion (hereinafter referred to as a retracted mold fitting recessed portion) m6 is formed in a region of the fixed mold m1 facing the movable mold m2, and the retracted mold fitting recessed portion m6 includes a flat bottom surface m6a. And a flat side wall surface m6b formed so as to surround the bottom surface m6a, and the movable mold m2 side is opened.

  m7 is a cylinder disposed in the fixed mold m1, m8 is a reversible mold driven by the cylinder m7 so as to be movable back and forth in the direction of the movable mold m2, and the reversible mold m8 is retracted. It is configured to be fitted in the mold fitting recess m6. M9 is a known angular pin.

  Between the movable mold m2 and the side slide mold m3, in order to form the side wall c1 of the container C, a side wall molding space v1 into which a molten foamed resin is injected is formed. Between the mold m2 and the side slide mold m3, from the upper end of the side wall molding space v1, it is substantially perpendicular to the side wall molding space v1 and toward the outside of the side slide mold m3. In order to form an extended upper end horizontal flange c2 of the container C, an upper end horizontal flange forming space v2 into which a molten foamed resin is injected is formed. Further, in the space formed by the corner of the movable mold m2, the corner of the side slide mold m3, and the corner of the fixed mold m1, the side wall is formed from the lower end of the side wall molding space v1. For forming a lower end horizontal flange into which molten foam resin is injected in order to form a lower end horizontal flange c3 of the container C, which extends substantially perpendicularly to the space portion v1 and toward the outer side of the side slide mold m3. A space portion v3 is formed.

  Further, in the state shown in FIG. 1 in which the retractable mold m8 has advanced in the direction of the movable mold m2 by the cylinder m7, there is a container C between the retractable mold m8 and the movable mold m2. In order to form the bottom portion c4, a bottom molding space portion v4 into which a molten foamed resin is injected is formed.

  Furthermore, a space formed by the corner of the movable mold m2, the corner of the side slide mold m3, and the corner of the fixed mold m1 includes a bottom molding space v4 and a bottom horizontal flange molding space. A bottom circumferential wall forming space v5 substantially perpendicular to the portion v3 is formed.

  In the mold structure M, the side wall forming space v1, the upper horizontal flange forming space v2, the lower horizontal flange forming space v3, the bottom forming space v4, and the bottom peripheral wall forming space v5 are provided. Thus, the cavity V into which the molten foamed resin is injected is formed. In addition, in the first injection stage of the molten foam resin for molding the container C, the side wall molding space v1, the upper horizontal flange molding space v2, the lower horizontal flange molding space v3, and the bottom molding space. The v4 and the bottom peripheral wall forming space v5 are each formed in a substantially uniform gap.

  The side surface m8a of the retractable mold m8 abuts on the side wall surface m6b forming the retractable mold fitting recess m6, and when the retractable mold m8 is set in the retractable mold fitting recess m6. As described above, the bottom molding space v4 for forming the bottom c4 of the container C is formed between the retractable mold m8 and the movable mold m2, and the retractable mold m8 is formed. And a bottom surface m6a of the receding mold fitting recess m6, a desired gap d1 is formed. As described above, the retractable mold m8 is configured to be driven by the cylinder m7 so as to advance and retract. From the state shown in FIG. 1, the cylinder m7 is operated to move the retractable mold m8 in the direction of the bottom surface m6a that forms the retractable mold fitting recess m6. Thus, it is comprised so that the volume of the space part v4 for bottom part shaping | molding can be expanded.

  G1 is a known runner for injecting the molten foamed resin into the cavity V. In the present embodiment, as an example, an example is shown in which the lower end horizontal flange forming space v3 is communicated. Has been.

  Next, the process of injection-molding the container C using the mold structure M having the above-described configuration will be described.

  First, the cylinder m7 is appropriately operated to form a bottom molding space v4 for forming the bottom c4 of the container C between the retractable mold m8 and the movable mold m2, The retractable mold m8 is set so that a desired gap d1 is formed between the retractable mold m8 and the bottom surface m6a of the retractable mold fitting recess m6.

  Next, as is well known, molten foam resin is injected into the cavity V from the runner G1. The molten foamed resin is formed by the side wall molding space v1, the upper horizontal flange molding space v2, the lower horizontal flange molding space v3, the bottom molding space v4, and the bottom peripheral wall reinforcing space v5. After being injected into the cavity V, the cylinder m7 is operated to move the retractable mold m8 in the direction of the bottom surface m6a forming the retractable mold fitting recess m6, so that the volume of the bottom molding space v4 is reached. To enlarge. In this way, the container C is injection molded.

  As described above, when the container C is injection-molded, the side wall molding space v1 other than the bottom molding space v4, the upper horizontal flange molding space v2, the lower horizontal flange molding space v3, and The molten foamed resin injected into the bottom circumferential wall reinforcing space v5 has almost no foaming agent compared to the bottom molding space v4 in which the volume of the space expands because the volume of the space does not increase. The solid state is substantially solid (hereinafter, the substantially solid state is referred to as a pseudo solid state).

  On the other hand, the bottom molding space v4 is expanded in volume by moving the retractable mold m8 in the direction of the bottom surface m6a forming the retractable mold fitting recess m6 by the operation of the cylinder m7. The foaming ratio is higher than that of the molten foamed resin injected into the side wall molding space v1, the upper horizontal flange molding space v2, the lower horizontal flange molding space v3, and the bottom peripheral wall reinforcing space v5. growing. As shown in FIG. 5, the bottom c4 forming the container C thus injection-molded is sandwiched between the upper skin layer c4a, the lower skin layer c4b, and the upper skin layer c4a and the lower skin layer c4b. It will be molded as a laminate comprising the foam core layer c4c.

  When the container C is injection molded using the mold structure M as described above, the bottom c4 is a foamed core sandwiched between the upper skin layer c4a, the lower skin layer c4b, and the upper skin layer c4a and the lower skin layer c4b. It is molded as a laminate comprising the layer c4c, and therefore the strength of the bottom c4 where strength is required is improved compared to the impact strength.

  Further, the peripheral wall portion of the bottom portion c4 is surrounded by the peripheral wall c5 formed by the bottom peripheral wall reinforcing space portion v5, and the bottom peripheral wall reinforcing space portion v5 for forming the peripheral wall c5 is, as described above, the container C. Since the volume does not expand at the time of injection molding, it is molded into a pseudo-solid state. Hereinafter, the peripheral wall c5 is referred to as a bottom peripheral wall reinforcing pseudo solid layer c5.

  When the container C falls with the bottom c4 down, the corner of the container C, that is, the corner C ′ formed by the bottom skin layer c4b of the bottom c4 and the pseudo solid layer c5 for reinforcing the bottom peripheral wall, However, in the container C of the present invention, since the bottom peripheral wall reinforcing pseudo solid layer c5 is formed on the peripheral wall portion of the bottom portion c4, the impact strength of the corner portion C ′ of the bottom portion c4 is increased. Therefore, damage due to the impact of the bottom c4 of the container corner C can be prevented. Moreover, since the lower end horizontal flange c3 is also formed in a pseudo solid state, even if an impact is applied to the lower end horizontal flange c3, the lower end horizontal flange c3 can be prevented from being damaged.

  Next, another embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, the central area of the surface of the retractable mold m8 facing the movable mold m2 is formed as a flat surface (hereinafter referred to as a central area flat surface) m8b parallel to the movable mold m2. Between the retractable mold m8 and the central region flat surface m8b of the retractable mold m8, the bottom molding space v4 in the above-described embodiment is formed. Further, on the surface of the retractable mold m8 facing the movable mold m2, an inclined surface inclined downward from the boundary portion forming the central region flat surface m8b toward the side surface m8a of the retractable mold m8. (Hereinafter referred to as a frame-shaped peripheral portion inclined surface) m8c is formed.

  As described above, the surface of the retractable mold m8 that faces the movable mold m2 is formed by the central area flat surface m8b and the frame-shaped peripheral inclined surface m8c, so that the central area of the retractable mold m8 is flat. Between the surface m8b and the movable mold m2, the bottom molding central space v4a ′ having the substantially uniform gap is formed, and the frame-shaped peripheral inclined surface m8c of the retractable mold m8 and the movable mold m2 are movable. Between the mold m2, a bottom forming gap increasing space portion v4a ″ having a gradually increased gap is formed in the direction of the side surface m8a of the retractable mold m8. In this embodiment, the bottom molding space v4a is composed of a bottom molding central space v4a ′ and a bottom molding gap increasing space v4a ″.

  When the container C is injection-molded using the mold structure M having the above-described configuration, the upper skin layer c4a and the lower skin formed by the bottom molding gap increasing space v4a ″ are formed. The foaming rate of the foamed core layer c4c constituting the laminate composed of the skin layer c4b and the foamed core layer c4c is foamed by the upper skin layer c4a, the lower skin layer c4b, and the foamed material formed by the bottom molding center space v4a ′ Since the foaming rate of the foam core layer c4c constituting the laminate composed of the core layer c4c is lower, the strength of the outer peripheral portion c4 ′ of the bottom c4 formed by the bottom forming gap increasing space v4a ″ is increased. It will be.

  As described above, by making the foaming rate of the outer peripheral portion c4 ′ of the bottom c4 lower than the foaming rate of the central region of the bottom 41, the strength and impact strength of the corner C ′ of the bottom c4 described above are improved. Can do.

  Next, still another embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, a bottom partition rib molding block m10 projects from the surface of the fixed mold m1 facing the movable mold m2, and faces the movable mold m2 of the bottom partition rib molding block m10. A protrusion m10a is provided on the surface.

  The retractable mold m8 is formed with a fitting recess m8d into which the bottom partition rib molding block m10 is fitted, and the bottom partition rib molding block m10 protrudes above the fitting recess m8d. A protrusion fitting slit m8d1 into which the stripe m10a is fitted is formed. Further, when the mold structure M is set, the tip of the protrusion m10a is retracted by a predetermined amount from the surface of the retractable mold m8 facing the movable mold m2, and is used for forming the bottom section rib. A bottom inner rib forming space portion v6 is formed on the upper portion of the protruding portion fitting slit m8d1 of the fitting recess m8d located at the tip of the protruding portion m10a of the block m10, and a bottom inner rib forming space portion is formed. v6 is configured to communicate with the above-described bottom molding space v4.

  Similarly to the above-described embodiment, when molten foam resin is injected into the cavity V from the runner gate G1, the molten foam resin is converted into the above-described side wall molding space v1, the top horizontal flange molding space v2, It is injected into the lower end horizontal flange forming space v3, the bottom forming space v4, the bottom peripheral wall reinforcing space v5, and the rib forming space v6. Thereafter, the cylinder m7 is actuated to move the retractable mold m8 in the direction of the bottom surface m6a forming the retractable mold fitting recess m6 to enlarge the bottom molding space v4. Even if the mold m8 is moved in the direction of the bottom surface m6a forming the retreat mold fitting recess m6, the side wall forming space v1, the upper horizontal flange forming space v2, the lower horizontal flange forming space v3, and the bottom Like the peripheral wall reinforcing space v5, the volume of the bottom inner rib forming space v6 does not increase, so the foaming agent of the molten foam resin injected into the bottom rib forming space v6 is almost Since foaming does not occur, as described above, the bottom inner partition rib c4d formed by the molten foam resin injected into the bottom inner rib forming space v6 is molded into a pseudo-solid state. The bottom inner partition rib c4d is connected to the upper skin layer c4a and the lower skin layer c4b constituting the bottom c4, and is connected to the bottom peripheral wall reinforcing pseudo solid layer c5.

  As described above, since the bottom inner partition rib c4d is formed in the bottom c4, the strength and rigidity of the bottom c4 can be further increased.

  In the embodiment described above, an example in which the container C is formed by the side wall c1, the upper end horizontal flange c2, the lower end horizontal flange c3, and the bottom part c4 is shown, but the outer surface of the side wall c1 extends vertically and horizontally. Existing reinforcing ribs can also be formed. Further, in the above-described embodiment, a so-called box-type container is shown in which the container C is integrally formed and cannot be folded, but the above-described structure is provided at the bottom part of various types of folding containers. Can be applied.

C ··········································· Sidewall c2・ ・ ・ ・ Lower end horizontal flange c4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Bottom c5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pseudo solid layer for reinforcing bottom peripheral wall G1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・··············································································································· m3 ············································································································· Cavity・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side-wall molding space v2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Top horizontal flange molding space v3 ・ ・ ・ ・ ・ ・ Lower-end horizontal flange molding Space v4・ Bottom molding space v5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Bottom peripheral wall molding space v6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rib molding space in the bottom

Claims (3)

  In a container comprising a bottom and a side wall, the bottom is formed as a laminate comprising an upper skin layer, a lower skin layer, and a foamed core layer sandwiched between the upper skin layer and the lower skin layer, and the bottom portion A container for transportation, wherein a pseudo solid layer for reinforcing the bottom peripheral wall is formed on a side surface of the container.   The transportation container according to claim 1, wherein the foaming rate of the outer peripheral part of the bottom part is configured to be lower than the foaming rate of the central part region of the bottom part.   The transport container according to claim 1, wherein a bottom partition rib in a pseudo solid state is formed in the bottom.

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