JPH06134898A - Container, method and device for producing the same - Google Patents

Abstract

PURPOSE:To easily mold a paper container without generating a cracking, embody the lightweight of the container and easily perform the incineration treatment of the container after use. CONSTITUTION:Unevenness such as plates 2 is formed over the entire surface of paper 3. A container 1 having a specific almost bottomed box type shape is molded by press molding using the paper 3 having unevenness formed thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container such as a food tray, a method for manufacturing the container, and a manufacturing apparatus.

[0002]

2. Description of the Related Art Conventionally, containers such as trays used for packaging foods have the problems of easy molding and light weight.
It was formed of a synthetic resin such as Styrofoam into a box shape with a bottom.

[0003]

However, the container of this conventional structure generates toxic gas when incinerated and does not corrode even if left naturally, so it is considered as a major environmental problem such as dust pollution. It is coming.

Therefore, an alternative product that can be incinerated after use has been earnestly desired, and it has been conventionally attempted to manufacture a container using paper such as a liner (base paper for corrugated board production). However, in this manufacturing method, since the liner has poor extensibility, there is a problem in that when the curved portion of the container is molded, the liner is cracked and is likely to be unmoldable.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and the object thereof is to easily mold it without causing cracks or the like. At the same time, it is possible to secure lightness, and further, it is possible to easily incinerate after use without generating toxic gas or the like, and to solve environmental problems, its manufacturing method and manufacturing apparatus. To provide.

[0006]

In order to achieve the above-mentioned object, in the invention of the container described in claim 1, a sheet having irregularities on the entire surface is used to form an almost bottomed box type. It is characterized by.

Further, in the invention of the method for manufacturing a container described in claim 2, unevenness is formed over the entire surface of the paper, and then the paper is press-molded into a predetermined container shape. is there.

Further, in the invention of the method for producing a container according to claim 3, unevenness is formed over the entire surface of the paper,
After that, a predetermined humidity is given to the paper, and the paper is press-molded into a predetermined container shape.

Further, in the invention of the method for manufacturing a container described in claim 4, the concavo-convex formation and the press molding are performed while heating the paper to a predetermined temperature.

Further, in the invention of the container manufacturing apparatus according to the fifth aspect, a concavo-convex forming mechanism for forming concavities and convexities over the entire surface of the sheet, and the concavo-convex formed sheet are press-molded into a predetermined container shape. And a press mechanism.

Further, in the invention of the apparatus for manufacturing a container according to the sixth aspect, a concavo-convex forming mechanism for forming concavities and convexities over the entire surface of the sheet, and a humidity imparting device for imparting a predetermined humidity to the concavo-convex formed sheet. It is characterized by comprising a mechanism and a press mechanism for press-molding a sheet to which humidity has been applied into a predetermined container shape.

Further, in the invention of the container manufacturing apparatus according to the seventh aspect, a heating means for heating the paper to a predetermined temperature is formed at the time of forming the unevenness by the unevenness forming mechanism and at the time of press molding by the pressing mechanism. It is characterized by being provided.

[0013]

[Operation] In the present invention, since the paper having the unevenness on the entire surface is used to form a container having a substantially bottomed box, it is easy to form the paper with the unevenness when molding the curved portion of the container. Extend to. Therefore, without causing cracks in the container,
Not only can it be easily molded, but it can also be lightweight. Further, since the container is made of paper, even if it is incinerated after use, no toxic gas or the like is generated, and an environmental problem can be solved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a container embodying the present invention will be described in detail below with reference to FIGS.

By the way, the container 1 of this embodiment is formed into a substantially bottomed box shape by using the paper 3 having a large number of concave and convex folds 2 on the entire surface. Then, in the curved portion 1a of the container 1, the folds 2 of the sheet 3 are in an expanded state. The plurality of reinforcing ribs 4 are formed on the bottom wall and the peripheral side wall of the container 1 so as to extend in the vertical and horizontal directions, and reinforce the bottom wall and the peripheral side wall of the container 1.

As described above, in the container 1 of this embodiment, the paper 3 having the uneven folds 2 on the entire surface is used.
Since it is formed into a box shape with a bottom, the curved portion 1 of the container 1
At the time of molding a, the paper 3 is easily stretched by the uneven folds 2. Therefore, without causing cracks in the container 1,
In addition to being easily molded, it is possible to secure the same lightness as that of a conventional styrofoam container. Further, since the container 1 is made of paper, even if it is incinerated after use, no toxic gas or the like is generated, and it is possible to solve the environmental problem in the conventional polystyrene container.

Next, one embodiment of a container manufacturing apparatus embodying the present invention will be described with reference to FIGS. As shown in FIG. 3, the winding shaft 11 is rotatably supported on a horizontal axis, and the long sheet 3 is wound around the outer periphery of the winding shaft 11. The heating drum 12 serving as a heating unit is arranged adjacent to the side of the winding shaft 11, and a pair of guide rollers 13 are arranged in contact with the outer circumferences of both sides of the heating drum 12. And the winding shaft 11
The sheet 3 fed from above is guided to the outer periphery of the heating drum 12 by the guide roller 13, and thereby the sheet 3 is heated to a predetermined temperature (160 ° C. in the embodiment), and the sheet 3 shrinks uniformly over the entire surface. At the same time, the water content is made uniform.

The pair of forming rollers 14 are the heating drum 1
A large number of concavo-convex strips 15 that are arranged in the next process of step 2 and mesh with each other are formed on the outer periphery thereof in an inclined state with respect to the axis. In the present embodiment, the forming roller 14 and the uneven strip 15 constitute an uneven forming mechanism. Then, the sheet 3 heated by the heating drum 12 passes between the two forming rollers 14, so that the uneven folds 2 are formed in a predetermined inclined state over the entire surface of the sheet 3, as shown in FIG. To be done.

The steam spraying machine 16 as a humidity imparting mechanism is arranged in the next step of the forming roller 14. And
When the sheet 3 having the folds 2 formed by the forming roller 14 passes through the steam spraying machine 16, steam is blown onto the sheet 3 to give flexibility to the sheet 3.

The pressing mechanism 17 is arranged in the next step of the steam spraying machine 16 and is a pair of upper and lower molding dies 1 facing each other.
8 and 19 are provided. Then, when the sheet 3 sprayed with the steam by the steam spraying machine 16 passes through the press mechanism 17, as shown in FIG.
The shape of the container 1 is press-molded, and the reinforcing ribs 4 are formed on the bottom wall and the peripheral side wall of the container 1.

The heater 20 as a heating means is installed in the molding die 18 of the pressing mechanism 17. Then, when the shape of the container 1 is press-molded on the paper 3, the heater 3 heats the paper 3 to a predetermined temperature (130 ° C. in the embodiment) to soften the internal fibers of the paper 3 and to form the paper at the time of molding. 3 is prevented from cracking.

The punching mechanism 21 is arranged in the next step of the press mechanism 17, and has a pair of upper and lower punching dies 22, which face each other.
Equipped with 23. Then, when the sheet 3 in which the shape of the container 1 is press-molded passes through the punching mechanism 21, the container 1 is punched and molded along the peripheral edge of the upper end by the punching dies 22 and 23 as shown in FIG. It

Next, the operation of the container manufacturing apparatus configured as described above will be described. Now, when this manufacturing apparatus is operated, the paper 3 is unwound from the winding shaft 11,
The paper 3 is heated by the heating drum 12, whereby the paper 3 is uniformly shrunk over the entire surface and the water content is made uniform. After that, the paper 3 is introduced between the forming rollers 14, and as shown in FIG. 4, the uneven folds 2 are formed in a predetermined inclined state over the entire surface of the paper 3.

Further, the paper 3 on which the folds 2 are formed is introduced into the steam spraying machine 16 and steam is sprayed onto the paper 3 to impart flexibility. After that, the paper 3 is guided to the press mechanism 17, and the shape of the container 1 is press-molded by both molding dies 18 and 19 as shown in FIG.
Reinforcing ribs 4 are formed on the bottom wall and the peripheral side wall.

At this time, the uneven folds 2 are formed on the entire surface of the paper 3, the steam is blown to the paper 3 to give flexibility, and the paper 3 is further heated by the heater 20. Since the internal fibers of the paper 3 are softened, the paper 3 is easily stretched at the folds 2 when the curved portion 1a of the container 1 is formed. Therefore, the shape of the container 1 can be easily formed without cracks in the paper 3.

After that, the sheet 3 is introduced into the punching mechanism 21, and the container 1 is punched by the punching dies 22 and 23 along the upper edge as shown in FIG. And
The punched and molded container 1 is waterproofed or oil-proofed as required.

[0027]

Another Embodiment Next, another embodiment of the present invention will be described with reference to FIGS.
It will be described with reference to FIG. First, in the embodiment shown in FIG. 6, the uneven folds 2 are formed so as to extend in the width direction of the sheet 3, so that the sheet 3 can be easily extended particularly in the longitudinal direction when the container 1 is press-molded. It has become. Further, in the embodiment shown in FIG. 7, the uneven folds 2 are formed so as to extend in the longitudinal direction of the sheet 3, so that the sheet 3 can be easily extended particularly in the width direction when the container 1 is press-molded. It has become.

Further, in the embodiment shown in FIG. 8, a large number of circular protrusions 5 are formed on the entire surface of the paper 3 at predetermined intervals. Thereby, when molding the curved portion 1a of the container 1 or the like, it is possible to prevent the paper 3 from easily expanding at the uneven portion due to the projection 5 and causing a crack.

The present invention is not limited to the configuration of the above-described embodiment, and for example, instead of the folds 2 and the protrusions 5 of the above-described embodiment, uneven wrinkles are formed on the entire surface of the paper 3. It is also possible to embody the configuration of each part by arbitrarily changing the configuration without departing from the spirit of the present invention, such as manufacturing a container using the paper 3 that has been waterproofed or oil-proofed in advance. is there.

[0030]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it can be easily molded without cracks and the like, and can be lightweight.
Moreover, there is an excellent effect that it is possible to easily incinerate after use without generating toxic gas or the like, and to solve environmental problems.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a container embodying the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic front view showing an embodiment of a container manufacturing apparatus embodying the present invention.

FIG. 4 shows a process of manufacturing a container by the manufacturing apparatus,
It is a partial plan view showing a state in which a fold is formed on a sheet.

FIG. 5 is a partial perspective view showing a state where the shape of the container is press-molded on the paper in the process of manufacturing the container by the manufacturing apparatus.

FIG. 6 is a partial plan view showing another embodiment in which a fold is formed on a sheet.

FIG. 7 is a partial plan view showing yet another embodiment in which a fold is formed on a sheet.

FIG. 8 is a partial plan view showing another embodiment in which a circular protrusion is formed on a sheet.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Uneven folds, 3 ... Paper, 5 ... Projection for forming unevenness, 12 ... Heating drum as a heating means, 14 ... Molding roller which comprises an unevenness forming mechanism, 15 ...
Concavo-convex strips constituting the concavo-convex forming mechanism, 16 ... a steam spraying machine as a humidity imparting mechanism, 17 ... a press mechanism, 20 ... a heater as a heating means.

Claims (7)

[Claims] 1. A container characterized in that it is formed in a box-like shape with a bottom by using a paper having unevenness on the entire surface. 2. A method of manufacturing a container, which comprises forming irregularities over the entire surface of a sheet, and then press-molding the sheet into a predetermined container shape. 3. A method for manufacturing a container, which comprises forming irregularities over the entire surface of a sheet, applying a predetermined humidity to the sheet, and press-molding the sheet into a predetermined container shape. 4. The method of manufacturing a container according to claim 3, wherein the unevenness formation and the press molding are performed while heating the paper to a predetermined temperature. 5. An apparatus for manufacturing a container, comprising: a concavo-convex forming mechanism for forming concavities and convexities on the entire surface of a sheet, and a press mechanism for press-molding the concavo-convex sheet into a predetermined container shape. . 6. A concavo-convex forming mechanism for forming concavities and convexities on the entire surface of the paper, a humidity applying mechanism for applying a predetermined humidity to the paper with the concavo-convex formed thereon, and the paper to which the humidity is applied into a predetermined container shape. A container manufacturing apparatus comprising a press mechanism for press molding. 7. The container according to claim 6, further comprising heating means for heating the paper to a predetermined temperature during the unevenness formation by the unevenness formation mechanism and the press molding by the press mechanism. Manufacturing equipment.