JPH0630084U - Paper tray structure - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a paper tray structure that is lightweight, has high strength, is water resistant, has appropriate water absorption and moisture absorption, and further does not impede the environment. . [Structure] The water-absorbent base paper 1 is bent to form a rectangular dish-shaped tray. The tray has a rectangular central portion 6 that constitutes the bottom of the tray, a four-circumferential wall portion 7 that is erected from the peripheral portion of the central portion 6, and extends further outward from the edge portion of the wall portion 7. The wall reinforcement portion 8 is attached by being folded back to the outside or the inside of the wall portion 7, and the corner portion 9 is formed in a bellows shape between the adjacent wall portions 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper tray structure used for storing fresh food, for example.

[0002]

[Prior art]

 Paper trays play an important role in storing fresh foods, and the demand for paper trays is increasing more and more in recent years, especially in the situation where plastics cannot be further increased in terms of environment and resources. is doing.

As such a paper tray that has been put into practical use, there are known ones in which cardboard is punched and then assembled, and those in which plastic fiber-containing cellulose is compression-molded.

[0004]

[Problems to be Solved by the Invention]

 By the way, as a method of using the tray, it is common practice to place food on the tray and then wrap it from the top surface of the food. Lapping can be done manually as well as mechanically. In this case, in order to finish the wrap cleanly, it is necessary to give sufficient tension to the wrap.

However, the paper tray has lower rigidity and elasticity than the plastic tray, and when a food containing a large amount of water is stored, the paper tray easily causes creep, in which case the tension of the wrap is weakened and the value of the product is reduced. Although the above drawbacks can be prevented by increasing the paper thickness to give strength, it is not a good idea in terms of resources and costs. In addition, depending on how the tray is used, it may be easier to use if it has appropriate water absorption and hygroscopicity.

The present invention has been made in view of the above problems and is a lightweight, high-strength, water-resistant paper tray structure having appropriate water absorption and hygroscopicity, and further impedes the environment. It is an object to provide a paper tray structure that does not exist.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a paper tray structure for forming a rectangular plate-shaped tray by bending a multi-layer base paper consisting of corrugated (corrugated) cardboard, a water resistant film and a water absorbing layer. In addition, a rectangular central portion that constitutes the bottom of the tray, a wall portion that is erected from the peripheral portion of the central portion, and a wall portion that extends further outward from the edge portion of the wall portion. It is characterized in that it is provided with a wall reinforcing portion that is folded back and bonded inward or inward, and a corner portion that is bent and formed in a bellows shape between adjacent wall portions.

The technique described in JP-A-64-71738 can be applied to the corrugated cardboard, and the technique described in JP-A-4-71443 can be applied to the water absorbing layer. For the multilayer base paper, it is preferable to apply the technique described in Japanese Patent Application No. 4-253180 filed on the same day as this application.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1 is a schematic cross-sectional view showing a base paper having a paper tray structure according to an embodiment of the present invention, and FIG. 2 is a plan view showing a folding structure for forming a paper tray from the base paper shown in FIG.

In FIG. 1, a water-absorbent base paper 1 is a meandering / corrugated structure (corrugated portion 120 g / m ² , smooth paper 150 g / m ²⁾ described in JP-A-64-71738 as a corrugated cardboard. ) 5, and a water-resistant film 4 on which a film of Bionore # 1000 15 μm (manufactured by Showa High Polymer Co., Ltd.) was heat laminated, and cellophane paper (PT-300 manufactured by Tokyo Cellophane Paper Co., Ltd.) 3 which is a water-absorbing layer. , And a pulp paper (Kinocloth KD-40, manufactured by Honshu Paper Co., Ltd.) on it, and 60 g / m ² of powdered starch syrup (SLD, manufactured by Sanmatsu Industrial Co., Ltd.). It is a multi-layer base paper that is laminated by heat. Since such a base paper 1 uses corrugated cardboard as a support, it has a rigidity and elasticity equivalent to that of a normal cardboard at a weight of about half, and is extremely superior in terms of resources and cost.

As shown in FIG. 2, the present invention is to form a rectangular dish-shaped tray by bending the water absorbent base paper 1. In order to mold the tray, first, a rectangular center portion 6 that constitutes the bottom portion of the tray, four circumferential wall portions 7 standing from the peripheral portion of the center portion 6, and an edge portion of the wall portion 7 are formed. A wall reinforcing portion 8 which extends further outward from the wall portion 7 and is folded back and adhered to the outside or inside of the wall portion 7, and a corner portion 9 which is formed in a bellows shape between adjacent wall portions 7 is cut out. In the figure, the mountain folds are shown by solid lines and the valley folds are shown by broken lines. Then, by bending the mountain folds and the valley folds and adhering the wall 7 and the wall reinforcement 8 to each other, the paper tray can be formed.

As a result, the upper end of the tray is formed by bending one sheet of water-absorbent base paper 1. Since the end of the base paper 1 is located at the lower part of the tray, the upper end of the tray where water easily enters Since the water resistance is maintained without water entering from the section, and the strength of the base paper 1 itself is high, the tray wall has a double structure by the wall section 7 and the wall reinforcement section 8. A structure having high mechanical strength can be obtained.

Therefore, even if a strong tension is applied to the paper tray of the present invention when it is wrapped, the tray is not deformed, and it is lightweight, has high strength and water resistance, and has appropriate water absorption and moisture absorption properties. It is possible to obtain a paper tray having

[0014]

[Effect of device]

 As described above in detail, according to the present invention, the upper end portion is in the shape of a bag, water is unlikely to enter, water resistance is maintained, and a corrugated structure is used. Since it has a double structure, it is possible to provide a base paper for a paper container that is lightweight and has high strength, water resistance, and moderate water absorption and moisture absorption. The width of can be expanded.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a water absorbent base paper.

2 is a plan view showing a folding structure for forming a paper tray from the raw paper of FIG. 1. FIG.

[Explanation of symbols]

 1 Water-absorbent base paper 2 Semi-permeable membrane 3 Water-absorbing agent / water-retaining material 4 Water-resistant film 5 Support (cardboard with corrugate) 6 Center part 7 Wall part 8 Wall reinforcement part 9 Corner part

Claims (1)

[Scope of utility model registration request] 1. A corrugated cardboard, a water resistant film,
A paper tray structure for folding a multi-layer base paper consisting of a water-absorbing layer to form a rectangular plate-shaped tray, and a rectangular central portion that constitutes the bottom of the tray and a peripheral portion of this central portion. An upright wall portion, a wall reinforcement portion that extends further outward from the edge portion of the wall portion and is folded back and adhered to the outside or inside of the wall portion, and bends in a bellows shape between adjacent wall portions. A paper tray structure having a formed corner.