JPS5840018Y2 - food packaging tray - Google Patents

Description

[Detailed description of the invention] The present invention is made of thermoplastic resin, foamed resin, or composite foamed resin made of thermoplastic foamed resin laminated with a non-foamed thermoplastic resin layer. This invention relates to a food packaging tray that has increased strength in the outside direction of the side wall of the tray and in the short side or long side width direction by reinforcing each connecting corner of the food packaging tray.

Conventionally, food packaging trays have had thicker base walls to increase their strength, continuous reinforcing ribs have been formed on the long and short side walls, and the bottom plate, or reinforcement has been added to the inside of the connecting corners between the bottom plate and the side walls. Ribs were to be provided, but simply increasing the thickness would require a large amount of raw material (original fabric), which would increase costs and would not have the effect of increasing strength, and reinforcing ribs were continuously formed from the bottom plate to the side walls. In some cases, when a large number of empty containers are stacked and transported, the stacking height becomes high, resulting in high transport costs.Also, when reinforcing ribs are formed at the connecting corners of the bottom plate and the side walls, the side walls The problem remains that the internal and external loads applied to the reinforcing ribs are concentrated at the joints between the reinforcing ribs and the side walls, causing cracks and destruction.

The inventors of the present invention completed the present invention in an attempt to solve these conventional problems.The gist of the invention is that the connecting corners of each component of the tray are rounded along with the inner and outer surfaces. Moreover, the radius on the inside is larger than the radius on the outside.

That is, the present invention provides a bottom plate portion 1 of a food packaging tray T made of styrene foam resin or the like as shown in FIGS. 1 and 2.
, the connecting corner portions 4 and 5 of each component consisting of the side walls 2 and 3 are formed so that the radius 7 on the inner surface is larger than the radius 6 on the outer surface, thereby improving the strength at the connecting corner portions 4 and 5. be.

The partially enlarged sectional view of FIG. 2 shows the connecting corner 4 of a foamed polystyrene plate made by vacuum forming.By making the inner radius 7 larger than the outer radius 6, the connecting corner 4, The wall thickness of the side walls 2 and 3 can be increased.
Force F1. Even when F2 is applied as an output, the inner thick portion acts as a force to resist these effects.

Here, the locations where the radius 6.7 of the inner and outer surfaces are set as described above include not only the connecting corners 4 around the bottom plate part 1, but also the connecting corners 5 at the four corners of the side walls 2 and 3 (connecting corners corresponding to Fig. 2). 5 sectional view is omitted) and the connecting corners around the bottom plate that intersect with the connecting corners of the four corners of the side wall, and the set width is the same as that of the connecting corners 4, which are stacked in the tray T. If the width of the space 8 formed between the lower surface of the bottom plate part 1 of the upper tray Ta and the upper surface of the bottom plate part 1 of the lower tray T is set as the upper limit, the height when stacked can be prevented from becoming higher than that of the conventional one. As long as the height of the inner surface radius 7 is allowed, it is possible to determine the size of the inner surface radius 7 with an appropriate width and use it as an embodiment of the present invention.

Next, regarding the connecting corner portion 5, by applying the present invention, the stacking height must be sacrificed a little, but from the purpose of reinforcement, a sufficient effect can be expected, and the setting width is The radius 7 can be made relatively small as shown in the imaginary line 5a in FIG. 1, or wide as shown in FIG.
This can be set in the upper width direction of the tray T, respectively, to reinforce the connecting corner portion 5, which has a high damage rate in such a tray T.

Furthermore, regarding the structure of these reinforced trays T, the relationship between the above-mentioned inner and outer surface radiuses 6.7 is similar to that of the tray for food packaging (Utility Application No. 141258/1983) previously filed by the present applicant, that is, the peripheral rising portion of the bottom of the tray. It can be said that it is preferable to apply it to the connecting corner of a tray in which the wall thickness around the mouth portion is larger than the wall thickness of the side wall portion of the tray, from the viewpoint of convenient use of the tray and the purpose of reinforcement.

These trays are formed by applying the double-sided vacuum forming method (Japanese Unexamined Patent Publication No. 148863/1983) previously filed by the present applicant, and for example, molds are formed as shown in imaginary lines 9 and 10 in Fig. 2. The industrial implementation of the present invention is facilitated by positioning the tip of the suction hole in the radius 6.7 plane, sucking from inside and outside of the connecting corners 4 and 5, and then performing vacuum forming.

Furthermore, the strength of the connecting corner 5 between the side walls 2 and 3 can be improved by providing an extension 11 on the outer edge of the upper end of the connecting corner 5, with or without adopting the inside-outside radius relationship of the present invention. The connecting corner 4 around the bottom plate part 1 and the connecting corner 5 between the side walls 2 and 3 can be reinforced without increasing the stacking height.

As mentioned above, in the food packaging tray T of the present invention,
The inner and outer surfaces of the connecting corners 4 and 5 are curved, that is, rounded, and the inner radius 7 is made larger than the outer radius 6 to make the wall thicker. In contrast to the case where reinforcing ribs are formed, the internal and external loads applied to the side walls are concentrated on the joints between the reinforcing ribs and the side walls, which tends to cause cracks and damage. Even if a load is applied to the side wall in the inner and outer directions, this load is distributed and acts on the entire inner and outer rounded surfaces 7 and 6, so it exhibits a high anti-load force with high elasticity and is extremely effective in preventing damage. It's expensive.

In addition, by adding the radius condition of the present invention to the connecting corner 4, for example, by setting the configuration condition where the radius of the outer radius 7.6 is thick and external, it can be reinforced without increasing the stacking height. Not only is this possible, but it also becomes possible to reinforce only the connecting corner portion 5, which has a high damage rate when an external force is applied.

In addition, the inner surface radius 7 of the connecting corner portion 4 around the bottom plate portion 1 is made larger than the outer surface radius 6, and the side walls 2,
When the extension part 11 is provided on the entire upper edge of the connecting corner 5 between the trays 3 or the entire outer edge of the tray opening, the degree of reinforcement of the entire tray is extremely high, and the damage rate at the four corners of the tray is also extremely low. can.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the tray of the present invention, FIG. 2 is a partially enlarged sectional view, FIG. 3 is a partially enlarged plan view, and FIG. 4 is a partially perspective view of another embodiment. 1...Bottom plate part, 2...Side wall, 3...
...Side wall, 4...Connection corner, 5...
Connecting corner, 6... External radius, 7...
Inner surface radius, 8...Space, 9...Suction hole, 10...Suction hole, 11...Protrusion portion.

Claims (1)

[Scope of utility model registration request] In stackable food packaging trays obtained by molding foamed polystyrene plates made of styrene-based foamed resin, the inner and outer surfaces of the connecting corners around the bottom plate of the tray are curved, and the radius of the inner surface is larger than that of the outer surface. A tray for food packaging.