JP3323481B2 - Cooling box with built-in plate-shaped foam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plate-shaped foam mainly composed of a paper powder component or a vegetable powder component of an official postcard waste paper.
It is built-in so as to cover the inner six surfaces of a box such as a cardboard box, etc., has an excellent cooling effect, and the plate-like foam can be incinerated as general garbage after transportation, etc., and thus is a plate-like excellent in natural environment The present invention relates to a cold box with a built-in foam.

[0002]

2. Description of the Related Art Styrofoam boxes have been widely used for storing and transporting foods, especially fresh foods, because of their excellent cooling effect. However, after use, the styrofoam box cannot be discarded as general waste because dioxin and the like are generated when it is burned, and is separated and discarded as non-combustible waste. At present, social issues are occurring. In particular, at present, the amount of the styrofoam box used in the fish market and the like is enormous, and its treatment is regarded as a national problem.

[0003]

For this reason, there is a demand for a box-shaped body which has an excellent cooling effect during storage and transportation and which can be burned as general waste after use. That is,
There is a need for the development of cool boxes that are friendly to the natural environment. Therefore, the present invention has been developed for the purpose of solving these problems.

[0004]

The inventor of the present invention has conducted intensive studies to solve the above-mentioned problems, and as a result, has found that the present invention has the following features.
0 to 40% by weight of a paper powder component or a vegetable powder component of official postcard waste paper or general waste paper, and 25 to 40 as an auxiliary agent.
A plate-shaped foam comprising a starch component of 35% by weight and a polypropylene resin component of 35 to 50% by weight is built in so as to cover six inner surfaces of a box such as a cardboard box, and the plate-shaped plate is formed. By using a cold box or the like with a built-in plate-like foam serving as a cool-keeping void inside the foam, the cold-holding effect is excellent, and the plate-like foam can be incinerated as general garbage after transportation, and is excellent in natural environment. The above-mentioned disadvantages or disadvantages have been solved.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A plate-like foam 1 is a main component of the present invention. As the plate-like foam 1, about 10 to
40% by weight of a paper powder component or a vegetable powder component of an official postcard or general waste paper, about 25 to 40% by weight of a starch (such as corn starch) component as an auxiliary, and about 35 to 50%
% By weight of a polypropylene resin component. In this specification, the official postcard waste paper refers to waste paper such as cutting waste and stained paper generated in the production process of the official postcard, and stained paper generated at the home of use. Also,
The vegetable powder component is a powder of bran, tea leaves, corn meal, food residues such as okara, and the like. Further, an increase or decrease of about 10% of each component is included in the present invention.

[0006] The postcard waste paper is first coarsely crushed (crushed) by a mixer cutter type pulverizer, and then finely pulverized by a mill (mortar) type pulverizer and collected as powder by a dust collector. A paper powder component as such a paper powder is kneaded with a starch component using a kneader, and is heated and melted together with a polypropylene resin component.
The plate-like foam 1 is extruded using a shaft extruder. It is preferable to pulverize the official postcard waste paper into a powder (about 150 to 80 μm particle size) that has passed through a 100 to 200 mesh sieve.

[0007] The proportion of the raw material composition of the foam of the present invention is such that the proportion of the polypropylene resin component in the whole is about 50% by weight, whereby a foam can be obtained. From the viewpoint of effective use of the postcard waste paper, it is desirable that the proportion of the polypropylene resin component is 50% by weight or less and the composition ratio of the postcard waste paper is 10% by weight or more, and is as large as possible. It should be noted that even when the proportion of the polypropylene resin component is 50% by weight or more, a foam substantially similar to the above can be obtained.

Next, a method for producing the plate-like foam 1 mainly composed of postcards made of official postcards will be described. First, waste paper of government-made postcards is roughly pulverized by a pulverizer of a mixer cutter type, and is roughly crushed.
Crush into fragments of about 20 mm. Then, it is finely pulverized by a mill-type pulverizer to obtain a paper powder component of about 200 mesh used postcard waste paper. Next, the paper powder component of the finely ground official postcard waste paper and a starch component that is an appropriate industrial starch are mixed. And, for the paper powder component and the starch component,
The polypropylene resin component (granules) and water are mixed and heated and kneaded. By extruding such components from an extruder as a high-temperature heating cylinder, the plate-like foam 1 passes through an extrusion die 5 and an extrusion mold frame 7 provided at the outlet end of the extruder, whereby the plate-like foam 1 is formed. Can be manufactured.

The extrusion die 5 has a rectangular cross section,
It is in the shape of a flat cube having an appropriate length. A plurality of holes 6, 6, ... penetrate in the length direction inside this cross section. The hole diameter is about 2 mm to about 3 mm. A plurality of the plurality of holes 6 formed in a string shape are bonded to each other by passing through an extrusion mold frame 7 in which a void having a rectangular cross section is formed, and the plate-like foam 1 is formed. This pushing direction is configured to pass from left to right as indicated by the arrow in FIG.

[0010] Such a plate-like foam 1 is built in so as to cover six internal surfaces of a box 2 such as a cardboard box. Specifically, as shown in FIGS. 1, 2, and 4, six plate-like foams 1, 1,... Each having a size of an inner wall are formed in a box shape. Are formed as the cold-storage voids 3. In the case of actual use, in the case of foodstuffs and fishes with a large amount of water, a waterproof bag 4 such as a vinyl bag is used in the cool-keeping space 3. As the waterproof bag 4, a PE film that does not generate harmful gases such as dioxin even when incinerated may be used.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific manufacturing steps will be described with reference to the flowchart of FIG. First, the used postcard is roughly crushed into pieces of about 15 to 20 mm by a crusher of a mixer cutter type (see S1). The coarsely pulverized paper fragments are finely pulverized by a mill type pulverizer (see S2). The fine powder is sucked from the upper part of the fine pulverizer with a 2.2 kW suction pump while adjusting the suction opening scale, and the paper powder is passed through a 100-200 mesh screen (about 150-200 mesh). 80μm particle size)
Collect as. The process up to this point is to convert used postcards made of government-made postcards into paper powder components.

The paper powder component and the starch component, which is an industrially modified starch, are added and mixed in a weight ratio of 4 to 6 (S).
3). Then, water is appropriately supplied to 24% by weight of such a paper powder component, 36% by weight of a starch component, and 40% by weight of a polypropylene resin component, and well kneaded with a kneader (S).
4). The paper powder component, the starch component, and the polypropylene resin component are put into an extruder (see S5).

FIG. 5 shows a mold 5 for extruding the above plate-like foam 1.
As shown in the figure, a total of 23 circular holes 6 having a hole diameter of about 2.5 mm are opened in a staggered arrangement in a cross section of about 105 mm, a height of 22 mm, and a mold thickness of about 10 mm. Immediately after coming out of the large number of holes 6, the plurality of holes 6 form a circular string, and the plurality of holes are fitted together so as to be in close contact with each other, and pass through the frame-shaped extrusion mold frame 7, are slightly contracted, and have a width of about A strip-shaped foam of 100 mm × about 20 mm in height is extruded (see S6). Then, immediately after leaving the extrusion die 5 and the extrusion mold frame 7, when the sheet is cut by a cutter at a desired length, for example, 45 cm, the plate-like foam 1 can be manufactured (see S7).

The production of the plate-like foam 1 from the paper powder component or the vegetable powder component of general waste paper is the same as the production method using a government-made postcard waste paper as a main component, and a description thereof will be omitted.

As shown in FIG. 6A, the extrusion die 5 has circular holes 6 having a width of about 80 mm, a height of 22 mm, and a hole diameter of about 2.5 mm in a total of 17 in a staggered arrangement. There is also an embodiment in which the pieces are opened, and when molded with this, the width is about 70 mm.
× A strip-shaped foam having a height of about 20 mm and an appropriate length (for example, about 30 cm) is formed. Further, as shown in FIG. 6 (B), an embodiment in which a total of 28 circular holes 6 with a hole diameter of about 2.5 mm are opened in a staggered arrangement within a cross section of about 105 mm and a height of 44 mm, as shown in FIG. Also exists. When molded with this, about 10 width
A strip-shaped foam of 0 mm × height of about 40 mm and an appropriate length (for example, about 30 cm) is formed.

As described above, even if the thickness (height) is about 20 mm or 40 mm, the width is 100 mm. Therefore, in the case of a desired width, for example, 280 mm, two of 100 mm and 80 mm It is configured by adhering one of them with an adhesive or the like. In addition, by increasing the size of the extruder, the thickness (height) is about 50 mm, the width is about 200 to 300 mm, and the appropriate length is 50 mm.
The production of the plate-like foam 1 of about 1 cm to 1 m is possible.

Further, as a specific experimental example, as the cool box of the present invention, the box 2 is a cardboard box, the height (thickness) of the plate-like foam 1 is 20 mm, and the inner side of the six sides of the cardboard box is And the plate-like foam 1 is piled up, and the internal volume thereof is approximately 2
75 mm x 175 mm x 205 mm = about 9.9 liters. On the other hand, a commercially available insulated box for transportation, that is, a commercially available insulated box for transportation is constituted only of styrofoam having a thickness of about 18 mm, and its internal volume is about 275 mm × 175 mm ×
100 mm = about 4.73 liters. In this case, one bag of rock ice (1,100 g) is placed in the cool box of the present invention and a commercial cool box, stored at room temperature of 26 ° C. for 14 hours, opened after storage, and the weight of the remaining ice. Was measured.

In the cool box of the present invention, about 610 g of rock ice remained. In a commercial insulated box, about 590
g of rock ice remained. Therefore, the cooling effect was equivalent to that of a commercially available styrene foam transport cooling box.

[0019]

First, in the invention of claim 1, 10
A plate-like foam comprising -40% by weight of a paper powder component or a vegetable powder component of an official postcard or general waste paper, 25-40% by weight of a starch component and 35-50% by weight of a polypropylene resin component as an auxiliary agent. The body 1 is built-in so as to cover six inner surfaces of a box 2 such as a cardboard box or the like, and the box-shaped plate-like foams 1, 1,... By using the cold storage box, it is possible to obtain an excellent cold storage performance, and in particular, it is possible to obtain an effect of forming a pollution-preventing plate-like foam 1.

According to the first aspect of the present invention, the plate-shaped foam 1 is built-in so as to cover six surfaces inside the box 2, and the box-shaped plate-shaped foams 1, 1,. Is used as a cold-storage cavity 3, so that a food or fish or the like can be put into the cold-storage cavity 3 to exhibit a sufficient cold-preserving effect. There are advantages that can be used. In addition, while used postcards are only used for ordinary recycled paper, the present invention can be used much more effectively.

In particular, since the polypropylene resin component contained in the plate-like foam 1 according to the first aspect of the present invention is a chain hydrocarbon polymer having no benzene ring, the polypropylene resin component may be a polystyrene or styrene foam which has been widely used. On the other hand, in the case of the combustion treatment, no harmful soot is produced, and after the combustion, mainly carbon dioxide gas and water vapor are generated, and the calorific value of combustion is smaller than that of expanded polystyrene or expanded polystyrene. Therefore, since the plate-shaped foam 1 can be burnt and disposed together with general household waste, a good effect can be obtained from the viewpoint of global environmental protection.

According to the second aspect of the present invention, in the first aspect, since the plate-like foams are substantially closely adhered and joined in the box body 2, they can be used for storage or transportation. There is an advantage that the heat insulation performance and the cold insulation performance are further improved, and the excellent cold insulation box can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of the present invention in which six plate-like foams are formed into a box shape and a box body into which the plate-like foam bodies are placed is separated.

FIG. 2 is a sectional view of the present invention.

FIG. 3 (A) is a partial cross-sectional view showing a state where the plate-like foams are separated from each other; FIG. 3 (B) is a partial cross-sectional view showing a state where the plate-like foams are in close contact with each other;

FIG. 4 is an exploded perspective view showing a box-like shape made of six plate-like foams.

FIG. 5 is a partially cutaway perspective view of an extrusion die and an extrusion mold.

FIG. 6A is a front view of an extrusion mold according to another embodiment. FIG. 6B is a front view of an extrusion mold according to still another embodiment.

FIG. 7 is a process chart for manufacturing the present invention.

[Explanation of Signs] 1: Plate-like foam 2: Box 3: Cooling gap

Continuation of the front page (56) References JP-A-2000-309658 (JP, A) JP-A-2000-7805 (JP, A) JP-A-10-129733 (JP, A) JP-A-6-74390 (JP, A) JP-A-2000-142832 (JP, A) JP-A-9-240755 (JP, A) JP-A-8-246398 (JP, A) JP-A-2000-64200 (JP, A) JP, U) Registered utility model 3073974 (JP, U) Registered utility model 3045263 (JP, U) Patent 3017716 (JP, B2) Patent 2838874 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB) B65D 81/38 B65D 5/60 B65D 85/50 C08J 9/12 D21H 17/28

Claims (2)

(57) [Claims] 1. 10 to 40% by weight of a paper powder component or a vegetable powder component of official postcard or general waste paper, 25 to 40% by weight of a starch component and 35 to 50% by weight of a polypropylene resin component as an auxiliary agent. A plate-like foam consisting of
A cold storage box with a built-in plate-shaped foam, which is built in so as to cover six surfaces inside a box body such as a cardboard box, and wherein the inside of the box-shaped plate-shaped foam is used as a cold-holding space. 2. The cold storage box according to claim 1, wherein said plate-like foams are substantially closely bonded to each other in said box.