JPH0285164A - Vessel with lid - Google Patents

Abstract

PURPOSE:To fit a vessel and a lid tightly by a method wherein parts to be fitted on both of the lid and the vessel of the vessel with a lid molded of expanded thermal plastic particles are equipped with one or more protrusions or recesses in a specific shape respectively and at least a pair of the protrusion and the recess are fitted to each other. CONSTITUTION:A vessel with a lid made of a molded part of expanded thermal plastic particles is constituted of a vessel body 2 having a portion to be fitted A at an upper section and a lid 3 having a portion to be fitted B at a lower section. Both portions to be fitted A, B are provided with one or more protrusions 5, 6, 7 protruding approximately perpendicular to a vessel side 4 or recesses 5', 6', 7' having a V- or U-shape cross section which are recessed approximately perpendicular to the vessel side respectively. Fitting of the portions A, B is realized when at least one pair of protrusions and recesses provided on both portions are fitted wherein one protrusion is fitted into one recess, 5 and 5', 6 and 6', or 7 and 7', for example.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a container with a lid made of an in-mold molded product of foamed thermoplastic synthetic resin particles. The present invention relates to a container with a lid, which is the first container with a lid that makes it possible to tightly fit the container body and the lid.

[Prior art] Inside the mold of foamed thermoplastic synthetic resin particles where a container body having a fitting part A on the upper part and a lid body having a fitting part B which fits into the fitting part A form a pair. Lidded containers made of molded articles are commercially available and known.

This product is generally made of expanded polystyrene resin particles molded in a mold, and is widely available on the market, for example, as a simple ice box or as a transport container for keeping cold or warm.

[Problems to be Solved by the Invention] The disadvantage of this type of container with a lid is that the suitability of the fitted state is
It is difficult to adjust and maintain the desired state. That is, the fitting principle of this type of container is as shown in FIG. are fitted by pushing them together, and the foam on the fitting surface is buckled and unrecovered deformation occurs. Therefore, if the mating condition is even slightly too strong, it will be extremely difficult to mate or unmate the container (equivalent to opening and closing the lid), and conversely, if the mating condition is weakened, the container will be damaged. There is a problem in that when the product is knocked over or handled roughly, the lid may come off and the contents may spill out. Moreover, since this fitted state changes immediately due to unrecovered deformation of the foam due to opening and closing operations of the lid, there is a problem in that it is difficult to adjust and maintain a desired fitted state between the two. In particular, in order to achieve the requirements of increasing the airtightness of the fitted state to block gas flow and prevent water (liquid) leakage, it is necessary to sacrifice the opening and closing operations of the lid due to the dimensional accuracy of the molded body. The problem is that the container cannot be used repeatedly because its airtightness is destroyed by prying the lid open. In addition, a space formed by combining two molds, a concave mold and a convex mold, is filled with foamed particles, and the particles are heated and foamed to fuse to obtain a molded article having the shape of the space. In the field of "in-mold molding of foamed thermoplastic synthetic resin particles", forming valleys (or protruding peaks) in the container (molded body) itself in a direction almost perpendicular to the side surface of the container is This means that the molded object will not be able to fit out of the mold, so this type of fitting where the peaks and valleys fit together is a problem that no one would think of or try. be.

[Means for Solving the Problems] The contents of the present invention will be explained in detail below using drawings and the like. 1st
The figure is a perspective view of an example of a lidded container 1 according to an embodiment of the present invention, and each of A), C), and C in Figs. FIG. 2 is a partial cross-sectional view in the PL-P2 direction showing an example of the structure of a fitting portion in which the lid body 3 is fitted;

In FIG. 1.2.3, [Means for Solving the Problem] That is, a detailed explanation of the present invention includes a container body 2 having a fitting part A on the upper part, and a fitting part that fits with the fitting part A. In a container 1 with a lid made of an in-mold molded product of foamed thermoplastic synthetic resin particles, which is paired with a lid 3 having a joint part B, a) both the above-mentioned fitting part A and fitting part B. 5.6.7 has an inverted V-shaped or inverted U-shaped cross section and protrudes in a direction substantially perpendicular to the container side surface 4; or a container side surface has a 7-shaped or U-shaped cross section; One or more valleys 5, 6, and 7 are provided each extending in a direction substantially perpendicular to the opening), and the fitting between the fitting portions A and B is defined by the fitting between the fitting portions A and B. At least one pair of peaks and valleys provided in the above are in a relationship such that the top of one fits into the groove of the other, such as at an angle of 5 and 5 degrees, 6 and 6', and 7 and 7 degrees. This method uses a container with a lid made of an in-mold molded product of foamed thermoplastic synthetic resin particles, which is characterized by the following characteristics, and thereby provides a tight fit between the container body and the lid. The goal is to make things possible.

[Example] FIG. 5 is a diagram showing the results of an experiment, and shows the technical idea that led the inventors to complete the idea as an invention. The joint axis is the height T of the peak (or the depth H of the valley) [unit: mm], and the horizontal axis is the compressive strength (2
) at 5% compression. The contents plotted are a consideration of the experimental results. The double circles indicate the possibility of "close fit with R die cutting", and the - heavy circles indicate the smoothness of the shape of the peaks and valleys. If the height is slightly increased, the possibility of "R" die cutting and close fitting 1 can be obtained, the cross marks indicate the locations where "Die cutting" could not be achieved, and the triangle marks indicate the locations where "R" tight fitting could not be expected. ing.

The experimental results diagram in Figure 5 shows the flexibility (for example, compressive strength) of the foam used and the height of the peaks (or depth of the valleys) of the fitting part.
The present study shows that if the relationship between molding and molding is appropriately selected, it is possible to at least make the molded container of the present invention's mating structure, which has traditionally been thought to be difficult and unfeasible. In other words, the height T of the peaks (or the depth H of the valleys) of the fitting structure of the present invention may be selected depending on the flexibility (for example, compressive strength) of the foam used there.

This fact indicates that the function that enables the r-mold cutting 1 and opening/closing of the fitting structure of the present application is based on the elastic deformation and deflection deformation of the foam forming the fitting part. There is.

However, in this case, the experimental results shown in Figure 2 show that the mountain width pitch is 14 mm.
Here are the results when the material was fixed to a single medium-density polyethylene foam and a set of molds were used. On the other hand, in practical use, the peak width pitch varies depending on the size of the target molded object and the overall dimensions of the fitting part, and the peak height (depth of the valley) varies depending on the peak width pitch. It's something you get. Furthermore, even if the foaming ratio is the same, the flexibility and elasticity of the foam will change if the resin material or foam structure changes.Therefore, it is recommended to use different target materials and different combinations of materials for the container body and lid. Taking this into consideration, it is not possible to easily express the dimensions of the peaks and valleys of the fitting portion of the present invention, and the technical idea of the invention is not accurately expressed. The optimal dimensions of the shape of the peaks and valleys of this fitting can be determined by conducting a few preliminary experiments based on the results shown in Figure 2, depending on the target material, the size of the molded object, the dimensions of the fitting part, etc. If so, it can be easily found.

As a guideline, the elastic recovery rate at 75% compression is 80-9.
Compressive strength at 5% and 25% compression is 0.5 to 1.3 Kg
/ , Practical fitting dimensions when targeting CRD polyethylene foam are a mountain width pitch of 10 to 30 mm,
It is preferable that the height of the crest is selected within the range of 3 to 6 mm, and the trough is dimensioned to accommodate the crest.In other words, the range of elastic deformation that can be repeatedly opened and closed in the mated state is approximately Figures 2.3 (a) to (c), which are desirably designed taking into account the thickness of 1 to 3 mm, show examples of the fitting style used in the present invention. The difference between these fitting styles is that the peaks and valleys protrude in a direction almost perpendicular to the side surface 4 of the container. Mountains and troughs are formed on both sides of portion A, and accordingly, fitting portion B of the lid that fits therein also has peaks and troughs on both sides of the fitting groove. On the other hand, in each day (c) of Fig. 2.3, the fitting part A has peaks and valleys formed on one side of the fitting part B, and the other side is flat. There is a difference. The difference between Figures 2 and 3 is that the formed peaks (troughs) have an inverted V-shaped (7-shaped) cross section.
The difference is whether it is formed into an inverted U-shape (U-shape) or an inverted U-shape (U-shape).

Further, in the example shown in FIG. 1, a fitting part A having peaks and valleys is arranged so as to surround the entire circumference of the opening of the container. In this connection, the fitting portion B of the lid body that fits into this is also arranged so as to surround the entire circumference of the lid body. Although this is a desirable aspect, -
It is reasonable that the fitting parts A and B themselves may be dispersed and arranged at key points around the opening of the container and the lid within the shell. All of these are selected in consideration of the structural strength of the container shape, container design, and usage function.

For example, if you want the container to be sturdy as a whole and not cause the lid to come off and the contents to spill out even if the container is handled roughly, use the method 5 shown in Figure 1.2 A). For example, the container is cylindrical.
If the deflection deformation of the fitting parts A and B can be minimized due to sufficient wall thickness, the model shown in the figure will be popular for its simple design. Furthermore, if the requirement is simply that the lid is difficult to come off during handling, a structure in which the fitting portions are dispersed at key points in the opening is sufficiently effective. This type of container is excellent in securing effective space in the container. In addition, there are cases in which the fitting part is required to be water leak resistant because the contents or liquid are involved, and a high degree of airtightness is required in the fitting part because the contents should be prevented from coming into contact with the atmosphere. At times, it is required to improve the dimensional accuracy of the fitting of the pair of peaks and valleys in the fitting portions A and H. This can be achieved by increasing the contact area between the paired peaks and valleys, as shown in Figure 1(a).

However, in this case, dimensional accuracy of the entire ridges and valleys in the fitting portions A and B is required, so a high level of technical skill is required. In this case, conversely, use fitting part A.

The fitting of the pair of peaks and valleys in B is considered as a pair, and the shape of the peaks and valleys is designed so that the fit of this part is a fit that involves local elastic deformation of the tip of the peak, and the dimensional accuracy is improved. It is also beneficial to make it easier to increase.

The significance of the fact that the target container of the present invention is an in-mold foam molded product obtained by heating and foaming and fusing pre-expanded foamed particles in a mold is that the container has an intrusive shape as described above. This has the advantage that a lid or container with parts can be made in a single process of molding. Therefore, keeping in mind the principles of the relationship illustrated in Figure 5, dimensional accuracy is required even if the shape is complex, as long as it is within the range where at least the protruding rod can be protruded and the die can be cut out. It has the advantage that it can be mass-produced extremely economically since it can be made using a process called molding.

The thermoplastic synthetic resin as used in the present invention is a general term for synthetic resins that can be foamed by heating or molded by heating. Specifically, examples include polyethylene resins, ethylene resins such as ethylene-vinyl acetate copolymers, propylene resins such as polystyrene, polystyrene resins, and styrene resins such as styrene-butadiene copolymers. system resins, and multicomponent copolymers whose components are styrene and ethylene or styrene, ethylene and vinyl acetate, or multicomponent copolymers whose components are vinylidene chloride, acrylonitrile, styrene and N-phenylmaleimide, etc. It is a copolymer. It is known that these resins can be used as a single resin or as a mixture of two or more resins for in-house foam molding. It is also known that there are cases in which it is better to crosslink the material during foaming, and there are also cases in which it is better to leave it uncrosslinked. When a high degree of elasticity or toughness against deformation is required for the mating part, use ethylene-based resins mainly composed of ethylene, multi-component copolymer resins whose components are styrene and ethylene, or styrene, ethylene and vinyl acetate. It is desirable to choose.

[Effects of the Invention] By having the above-described structure, the present invention can provide a container with a lid in which the container body and the lid can be tightly fitted, which can be efficiently performed in the in-mold molding process of foamed synthetic resin particles. has the advantage of being mass-produced.

The tightness of the fit ranges from, for example, cases in which the lid of the container is difficult to remove, cases in which the contents do not spill out even if handled roughly, cases in which the fitting part requires water leakage resistance, or This has reached a point where high airtightness is required for the fitting part. These are functions that have traditionally been abandoned because they have never been achieved. Therefore, the container of the present invention having the above-mentioned functions is not limited to a conventional transportation container with only a buffer function, but can also be used as a transportation container for contents with liquid such as for transporting live fish, and for transporting optical equipment to prevent deterioration thereof. For example, the use of containers with lids for in-mold molded products is expanded, as their functionality is enhanced, such as containers for transporting contents that contain rust preventives and moisture preventive agents to avoid contact with the atmosphere. There is.

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[Brief explanation of the drawing]

1.2.3 are explanatory diagrams of a container fitting part showing an embodiment of the present invention, FIG. 4 is an explanatory diagram of a conventional container fitting part, and FIG. 5 is a diagram of experimental results. [Symbol explanation] 1: In-mold foam molded product container, 2: Container body, 3: Lid body,
A, B: Each fitting part 5.6, 7. , Yamabe, 5°, 6', 7' Valley and above 21 box procedure customs ■ Ordinary book ('j5 type) % type % Relationship with the incident shown

Claims (1)

[Claims] A container body having a fitting part A on the upper part and a lid body having a fitting part B which fits into the fitting part A form a pair, made of foamed thermoplastic synthetic resin particles. In a container with a lid made of an in-mold molded product, a) Both the fitting part A and the fitting part B have an inverted V-shaped or inverted U-shaped cross section and are almost perpendicular to the side surface of the container. one or more peaks protruding in the direction, or valleys each having a V- or U-shape in cross section and extending in a direction substantially perpendicular to the side surface of the container; b) and the above-mentioned fitting part. The fitting between A and B is such that at least one pair of peaks and valleys provided in the fitting parts A and B are such that the top of one fits into the groove of the other. A container with a lid made of an in-mold molded product of foamed thermoplastic synthetic resin particles, which allows the container body and lid to fit tightly together.