JPH0558271U - Double wall container - Google Patents

Abstract

(57) [Summary] [Purpose] To realize a double-walled container that is easy to mold and assemble and has high strength. [Structure] A container body 1 having a deep depth includes a pair of split members 4A, 4B having a hollow double-wall structure formed by hollow molding.
And a pair of intervening members 5A and 5B. The pair of dividing members 4A and 4B have a shape that is divided in a direction perpendicular to the surface of the opening 1A of the container body, and are a side wall and a bottom wall of the container body 1 and the side wall, respectively. And a container body having bent portions 4A-1 and 4B-1 forming the corners of the container body bent from both ends of the portion to be the bottom wall, and the tip of the bent portions 4A-1 and 4B-1. Step portions 4A-2 and 4B-2 are formed on the inner surface side. Then, the step portions 4A-2, 4B-2
In, the intervening members 5A and 5B having a hollow double-wall structure are fixed and joined by a plurality of rivets 8.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a so-called double-walled container having a deep depth with respect to the length of one side of an opening.

[0002]

[Prior Art]

 Conventionally, as the double-walled container, the double-walled containers of (A) to (C) described below are known.

(A) A double-walled container 51 formed by integral molding as shown in FIG. 5, which has a male mold having a projecting portion that can be retracted, a bottom mold, and a mold that can be opened on both sides of the male mold. Molded using a side wall mold and a female mold composed of a side wall mold (see Japanese Patent Application Laid-Open No. 2-127031).

(B) As shown in FIG. 6, a pair of halves 61, 62 obtained by dividing a double-walled container into two in the direction perpendicular to the surface of the opening are molded in one step. One in which 62 is joined at the joining portion 63 (see Japanese Patent Publication No. 61-30895).

(C) As shown in FIG. 7, a base plate having a double-wall structure and a side plate 71 connected to the base plate via a hinge are integrally formed by hollow molding, and then bent at the hinge portion to form a box. It is formed in a fixed shape and is fixed with hooks 73, and a fixing frame 72 is fitted to the peripheral edge of the opening (Japanese Patent Laid-Open No. 63-96030).

[0006]

[Problems to be solved by the device]

 The above-mentioned conventional techniques have problems to be solved as described below.

Since (a) is molded by a special molding device equipped with a mold having the above-described complicated structure, the molding process is complicated and the manufacturing cost is high, and the deep double-walled container is deep. In that case, the expansion ratio of the corners is too high, and the molding defects such as the wall thickness of the corners becoming thin occur.

In the case of (B), the expansion ratio of the corner portion of the joint portion is too high to cause defective molding, and the strength of the joint portion is weak.

In (c), the assembling at the time of assembling is complicated, the strength of the joint surface is weak, and the flat plate-shaped members constituting the double-walled container are inferior in rigidity themselves, and The strength of the standing double-walled container also becomes weaker.

The present invention has been made in view of the problems to be solved by the above-mentioned conventional techniques, and it is an object of the present invention to realize a double-walled container that is easy to mold and assemble and has high strength. It is intended.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, the double-walled container of the present invention is a double-walled container having a deep container body, wherein the container body is paired with a pair of hollow-molded double-walled dividing members. And a pair of dividing members, wherein the pair of dividing members are respectively a side wall and a bottom wall of the container body, and a corner portion of the container body bent from both sides of the one side wall. And a step portion is formed on the inner surface side of the container body at the tip of the bent portion, and the intervening member is joined at the step portion. ..

Further, the container may have a hollow-molded double-walled container lid provided on one side of the opening of the container body via a hinge.

[0013]

[Action]

 Since the corner portion of the container body is composed of the bottom wall portion and the bent portion of the pair of divided members, the strength of the container body is increased. Further, since the interposition member is joined at the stepped portion provided on the inner surface side of the container body at the tip of the bent portion, the strength of the joined portion is also increased. In addition, since the length of the bent portion is shortened by the amount of the intervening member provided, the expansion ratio at the tip of the bent portion is lowered, and molding defects such as thinning of the resin wall in this portion are avoided. Does not occur.

[0014]

【Example】

 An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view showing an embodiment of the double-walled container of the present invention, FIG. 2 is a cross-sectional view thereof, and FIG. 3 is a cross-sectional view showing about half of the cross section taken along the line AA of FIG. is there.

The double-walled container of this embodiment is a container lid body that is joined to a container body 1 having a deep depth and a hinge 3A integrally formed on one side edge of the opening 1A of the container body 1. It consists of two parts.

The container body 1 is assembled from a pair of split members 4A, 4B having a hollow double-wall structure formed by hollow molding of a thermoplastic resin and a pair of intervening members 5A, 5B. The pair of dividing members 4A and 4B have a shape that is divided in the direction perpendicular to the surface of the opening 1A of the container body 1, and are a side wall and a bottom wall of the container body 1, respectively. It has bent portions 4A-1 and 4B-1 that form the corners of the container body bent from both ends of the side wall and the bottom wall, and the tip of the bent portions 4A-1 and 4B-1 Step portions 4A-2 and 4B-2 are formed on the inner surface side of the container body.

The stepped portions 4A-2 and 4B-2 are portions where a pair of intervening members 5A and 5B are joined, and in the present embodiment, the split members 5A and 5B are joined by a plurality of rivets 8. ing.

With the above-described configuration, the strength of the corner portion of the container body 1 becomes stronger and the strength of the joint portion between each intervening member 5A, 5B and the pair of dividing members 4A, 4B becomes stronger.

Further, in this embodiment, the latch 6 is integrally formed on the free end side of the container lid 2 via the hinge 3A, and is engaged with the latch receiving projection 7 integrally formed on the opening side of one of the split members 4B. It is configured to be compatible.

The dimensional definition of the deep-walled double-walled container according to the present invention will be described with reference to FIG.

In FIG. 2, t₁ : Average thickness of the resin wall of the container body 1 (both inner and outer walls) t₀ : Average gap of the hollow part of the container body 1 W: Maximum width of the opening of the container body 1 in the dividing direction D: Maximum depth of the container body: (1) What is a double-walled container?₁ = 1.5-4.5 mm, t₀ = (0.3-20) t ₁ I mean one. (2) A deep-walled double-walled container means a container having D = 0.6 W or more. (3) A double-walled container that is deep and difficult to achieve without the present invention is W = 50t.₁ The above is said.

In the present embodiment, as shown in FIG. 3, the steps 4A-2 and 4B-2 are hollow except for the part into which the rivet 8 is inserted. By doing so, when the double-walled container is used as a heat insulating container, the heat insulating property becomes good. Further, the stepped portions 4A-2, 4B-2 and the intervening members 5A, 5B are formed with recesses for accommodating the head of the rivet 8 and the like so as not to project to the outer surface and the inner surface of the container body 1.

Next, the manufacturing process of the double-walled container of this embodiment will be described.

FIG. 4 is a schematic cross-sectional view showing a manufacturing process by hollow molding.

The die is of a split type, and the female die 10A has a latch forming section 15A, a compression section 17A, a compression section 17A, sequentially from the extrusion head side along the parting line surface (the same direction as the pushing direction of the parison). It has a concave cavity composed of a lid body forming concave portion 11A, a compression portion 18A, a dividing member forming concave portion 12A, a compressing portion 19A, a dividing member forming concave portion 13A, and a latch receiving forming portion 16.

On the other hand, the male die 10B has a ratchet forming portion 17B, a compressing portion 18B, a lid forming convex portion 11B, a compressing portion 18B, and a dividing member forming convex portion in order from the extrusion head side along the parting line surface. It has a convex cavity composed of the portion 12B, the compression portion 19B, and the dividing member forming convex portion 13B.

With the mold opened, the thermoplastic resin is plasticized by an extruder (not shown), the cylindrical parison 21 is extruded from the extrusion head 20 of the extruder, and then the mold is reshaped. The parison 21 is clamped and pinched, and a pressurized fluid is introduced into the parison 21 by a blow-in needle (not shown) to expand it into the shape of the cavity, and the container lid 2 having a hollow double-wall structure and a pair of dividing members. 4A, 4B, the latch 6, the latch receiving projection 7 and the hinges 3A, 3B, 3C are integrally molded.

Next, after cooling the mold, the mold is opened, the molded product is taken out, and the excess burr 14 is removed.

In the present invention, since the step portions 4A-2 and 4B-2 are provided on the inner surface side of the container body, there is no undercut portion, and since the expansion ratio of the bent portion is low, molding defects do not occur. ..

After that, the hinge 3B that connects the pair of split members 4A and 4B is bent to assemble the tip surface of the bottom wall portion as a butt portion 9 (see FIG. 1), and separately form the hollow portion. The intervening members 5A and 5B having the hollow double-wall structure described above are fitted to the stepped portions 4A-2 and 4B-2 of the pair of divided members 4A and 4B that are respectively assembled, and then a plurality of rivets 8 are provided. To fix both. That is, the pair of divided members 4A, 4B and the intervening members 5A, 5B are joined at the step portions 4A-2, 4B-2 to manufacture the container body 1.

In the above embodiment, the container lid 2 is shown, but the container lid is not always necessary, and other known fixing means such as bolts and nuts instead of rivets. May be used.

[0033]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

Despite being a deep-walled double-walled container, the thickness of each wall is uniform and the strength of the joint between the pair of dividing members and the interposition is strong, so that the double-walled container is The strength of the entire container also becomes stronger.

Further, since the manufacturing can be performed relatively easily without requiring a special molding device or a complicated molding process, the manufacturing cost is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the double-walled container of the present invention.

2 is a cross-sectional view of the double-walled container shown in FIG.

FIG. 3 is a cross-sectional view showing about half of the cross section taken along the line AA of FIG.

FIG. 4 is a schematic cross-sectional view showing a step of forming the double-walled container shown in FIG. 1 by hollow forming.

FIG. 5 is a perspective view showing a conventional double-walled container formed by integral molding.

FIG. 6 is a perspective view showing a double-walled container in which a pair of conventional dividing members are combined.

FIG. 7 is a perspective view showing a double-walled container in which conventional flat plate members are combined.

[Explanation of symbols]

 1 Container Main Body 2 Container Lid 3A, 3B, 3C Hinge 4A, 4B Dividing Member 5A, 5B Interposing Member 6 Latch 7 Latch Receiving Protrusion 8 Rivet 9 Butt

Claims (2)

[Scope of utility model registration request] 1. A double-walled container having a deep container body, wherein the container body is a combination of a pair of hollow-molded double-walled dividing members and a pair of intervening members. Each of the pair of dividing members has a side wall and a bottom wall of the container body, and a bent portion forming a corner portion of the container body bent from both sides of the one side wall. A double-walled container, wherein a step portion is formed on the inner surface side of the container body, and the intervening member is joined at the step portion. 2. The double-walled container according to claim 1, further comprising a hollow-molded double-walled container lid provided on one side of the opening of the container body via a hinge.