JPS6137617Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a packaging container. For more details 75～
Synthetic resin of the laminate obtained by laminating a synthetic resin film made of a synthetic resin composition of 25% by weight polystyrene synthetic resin and 25 to 75% by weight polyolefin synthetic resin and a polystyrene synthetic resin foam sheet. Relating to a packaging container formed by molding with the film laminated surface facing inside, the peripheral edge of the packaging container being inclined or curved downwardly outside the packaging container. It is an idea. Packaging containers obtained by molding polystyrene-based synthetic resin foam sheets are lightweight, have appropriate elasticity, and have good insulation properties, making them suitable for packaging meat, fish, and other food products. It is widely used as However, packaging containers made from polystyrene synthetic resin foam sheets,
Since oil resistance and impact resistance are poor as is, it has been proposed to improve oil resistance and impact resistance by laminating a polyolefin film such as polyethylene film or polypropylene film thereon. However, in this case, there was a drawback that sufficient adhesion could not be obtained because polystyrene and polyolefin had poor affinity. The inventors of the present invention created a laminate made by laminating a polystyrene-based synthetic resin foam sheet and a synthetic resin film with excellent affinity, thereby achieving excellent oil resistance and impact resistance during normal use. We devised a packaging container that However, in this case too, if you put tempura or other hot oily food in a packaging container,
When packaging is covered with a regular wrap film, the oil that has flowed along the inner surface of the wrap film comes into contact with the periphery of the packaging container and the wrap film, causing the oil to attack the polystyrene-based synthetic resin foam sheet. It often deteriorates due to
There was a drawback that the packaging container had poor oil resistance. The inventor of the present invention conducted various studies to improve these shortcomings, and as a result, by creating a special shape for the periphery of the packaging container, it was possible to place hot oil-based foods into the packaging container and wrap it in a wrap film. The present invention was completed by discovering that polystyrene synthetic resin does not deteriorate due to oil even when it is covered and packaged from above. In the present invention, polystyrene-based synthetic resins include, for example, polystyrene, impact-resistant polystyrene, copolymers of styrene and other vinyl monomers,
and mixtures thereof are used. Examples of polyolefin synthetic resins that can be used include polyethylene, polypropylene, ethylene-vinyl acetate copolymers, and mixtures thereof. The polystyrene synthetic resin foam sheet of the present invention is manufactured by a conventional manufacturing method, and its thickness is generally 1 to 5 mm, and a sheet having a preferable thickness within this range is manufactured. In the present invention, the content of polystyrene synthetic resin in the synthetic resin film is 75 to 25% by weight,
Preferably it is 60 to 40% by weight. In addition, the content of polyolefin synthetic resin is 25 to 75% by weight,
Preferably it is 40 to 60% by weight. If the content of polyolefin synthetic resin is less than 25% by weight, oil resistance may be poor, so it is not preferable, and 75
If it exceeds % by weight, it is not preferable because the adhesiveness with the foam sheet will be poor. The synthetic resin film used in the packaging container of the present invention is manufactured by a normal method, and the thickness of the synthetic resin film in this case is generally 0.01 to 0.2 mm.
and preferably 0.05 to 0.15 mm. The polystyrene-based synthetic resin constituting the synthetic resin film is preferably the same synthetic resin as the polystyrene-based synthetic resin foam sheet, and most preferably the same polystyrene-based synthetic resin. To laminate a polystyrene synthetic resin foam sheet and a synthetic resin film, use a normal laminate manufacturing method, for example, extrude a molten synthetic resin onto a polystyrene synthetic resin foam sheet through a T-die and laminate it onto the foam sheet. A laminate can be manufactured using the method of press-bonding. In the present invention, the peripheral edge of the packaging container is sloped or curved downward on the outside of the container, but the width of the peripheral edge, that is, the downwardly sloped portion of the packaging container or the width of the curved surface is In consideration of the case where an oil-based food is placed in a devised packaging container and covered and packaged with a wrap film, the thickness is generally 1 mm to 10 mm, preferably 2 mm to 5 mm. Furthermore, the degree of inclination of the peripheral edge of the packaging container of the present invention outward and downward cannot be determined unconditionally as it varies depending on the size of the contents to be placed in the packaging container, but it is generally 0° to 0° with respect to the horizontal plane. The angle is appropriately determined within the range of 90°, but a preferred angle is 30° to 85°, and a particularly preferred angle is 60° to 80°. The packaging container of the present invention is a laminate obtained by laminating a polystyrene-based synthetic resin foam sheet and a synthetic resin film, with the film laminated side facing inside, and the packaging having a peripheral edge of a desired shape by a normal molding method. It can be easily manufactured by molding it into a container. Of course, the packaging container of the present invention can be used as a packaging container as is, but especially when the object to be packaged is hot oily foods such as tempura and korotsuke, these oily foods can be used in the packaging of the present invention. By placing it in a container, covering it with a wrap film, and packaging the container with the periphery of the packaging container in contact with the wrap film, the wrap film and the periphery of the packaging container are brought into close contact, so that the wrapping that has passed inside the wrap film is removed. It is possible to prevent the liquid from flowing out of the container. Therefore, since there is no contact between oil and the polystyrene-based synthetic resin foam sheet, it is possible to prevent the polystyrene-based synthetic resin foam sheet from deteriorating due to oil. Next, the present invention will be explained with reference to the drawings. FIG. 1 is a front view of one example of the packaging container of the present invention, FIG. 2 is a side view, and FIG. 3 is a
It is a sectional view A′, showing a case where the peripheral edge of the packaging container is inclined outwardly and downwardly. FIG. 4 similarly shows the case where the peripheral edge is curved. FIG. 5 shows a sectional view of a conventionally used container as a comparative example. FIG. 6 shows an example of how the packaging container of the present invention is used, in which an oily food to be packaged is placed in the packaging container and covered with a wrap film. FIG. 7 is an enlarged view showing the state of the peripheral edge of the packaging container in FIG. 6. When an oily food is placed in the packaging container of the present invention and covered and packaged with a wrap film, the oil coming out of the oily food travels inside the wrap film and reaches the periphery of the packaging container because the oily food is in contact with the wrap film. However, in the packaging container of the present invention, the periphery of the packaging container is directed toward the outside of the packaging container, and is sloped downward from the horizontal plane, or the periphery is curved. Since the plastic film and the synthetic resin film are in close contact with each other with an appropriate width, the oil cannot flow out to the tip of the periphery.
Flows in the direction of the arrow. Therefore, since the polystyrene synthetic resin foam does not come into contact with oil, it exhibits an excellent effect in that the resin is not attacked and deteriorated by oil. However, in conventionally used packaging containers as shown in FIGS. 8 and 9, which are comparative examples, the periphery of the packaging container is horizontal, and there is no part that acts to change the flow of oil. Therefore, the oil that has traveled through the wrap film reaches the tip of the periphery of the packaging container, gradually corroding the periphery, and eventually the packaging container cannot maintain its original shape. Next, the present invention will be explained with reference to examples. Examples 1 to 3, Comparative Examples 1 to 4 A synthetic resin film with a thickness of 80μ and a density of 0.1 was produced by extruding a synthetic resin composition consisting of low density polyethylene and polystyrene in the proportions shown in Table 1 through a T-die. dl/cm ³ and a polystyrene foam sheet with a thickness of 3 mm, and then crimped with a pressure roll to obtain a laminate with a thickness of 3 mm. The size of this laminate is 90mm x 190mm by compressed air and vacuum forming method.
mm, depth 20mm, peripheral width 3mm, inclination angle
An 80° packaging container was molded. Further, as Comparative Example 3, a polystyrene foam sheet without laminated synthetic resin film was used, and as Comparative Example 4, the same laminated sheet as in Example 1 was used, except that the peripheral edge of each of Examples 1 to 3 was horizontal. A packaging container similar to that was molded. Table 1 shows the results of observing the cut surface during molding of the packaging container and determining the adhesion between the foam sheet and the synthetic resin film. In addition, vegetable tempura was placed in the resulting packaging container, covered and packaged with polyvinyl chloride stretch film, and kept in heated air at 70° C. for 20 hours to conduct an oil resistance test. The results are shown in Table 1. The criteria for the adhesion and oil resistance tests in Table 1 are as follows. Adhesion Good: The foam sheet and the synthetic resin film were not peeled off at all. Poor: The foam sheet and the synthetic resin film were judged to have peeled off even partially. Oil resistance Good...No change in the shape of the container and no coloration Poor...The shape of the container has changed and it has been colored yellow Very poor...The shape of the container has changed significantly, with uneven deformation on the bottom of the container, The coloring was also judged to be significant. 【table】

[Brief explanation of the drawing]

1 to 4 are drawings showing an example of an embodiment of the present invention, with FIG. 1 showing a front view and FIG. 2 a side view. FIG. 3 is a sectional view taken along the line A-A' in FIG. 1, showing a case where the peripheral edge of the packaging container is inclined outwardly and downwardly. FIG. 4 shows a cross-sectional view of the packaging container of the present invention in which the peripheral edge is curved. FIG. 5 shows a cross-sectional view of a comparative container conventionally used. 6th
The figure shows an example of how the packaging container of the present invention is used. FIG. 7 is an enlarged view showing the periphery of the packaging container in FIG. 6. FIG. 8 shows an example of how the comparative example container is used. FIG. 9 is an enlarged view showing the peripheral portion of the comparative example packaging container in FIG. 8. 1 in the drawing
2 is a polystyrene synthetic resin foam sheet, 2 is a synthetic resin film, 3 is a wrap film, 4 is a packaged object, and 5 is a portion of the polystyrene synthetic resin foam deteriorated by oil. Further, the arrows in FIGS. 7 and 9 indicate the direction in which oil adhering to the wrap film flows.

Claims (1)

[Scope of utility model registration request] 75~25% by weight polystyrene synthetic resin and 25~
A synthetic resin film having a synthetic resin composition of 75% by weight of polyolefin synthetic resin and a polystyrene synthetic resin foam sheet are laminated, and the resulting laminate is molded with the side on which the synthetic resin film is laminated inside. 1. A packaging container characterized in that a peripheral edge of the packaging container is inclined or curved outwardly downward from the packaging container.