JP2001106221A - Aluminum foil container and method for manufacturing aluminum foil container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum foil container having superior peeling-off characteristic and superior shape holding characteristic without using any laminated sheet and further provide a method for manufacturing the aluminum foil container. SOLUTION: A molding unit sheet 49 easily taken out by displacing a blank is stacked on a first stage groove 119 of a first die member 129 of a molding device turned upside down. With such a stacking operation as above, the upper most surface of the molding unit sheet 49 becomes an erasing surface of a laminated aluminum foil 53 and a punched-out partition sheet 51 is positioned at the lower most part. Under this state, a second die member 117 descends to form a laminated aluminum foil container. Under this laminated state, a predetermined slipping effect is produced between it and the inner surface of an adjoining aluminum foil container due to the fact that a slipping agent is coated on the outer surface of the adjoining aluminum foil container, resulting in that its handling becomes easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum foil container, and more particularly to an aluminum foil container formed by pressing a laminated aluminum foil sheet and a method of manufacturing the container.

[0002]

2. Description of the Related Art FIG. 9 is an external perspective view of a conventional aluminum foil container. Referring to the figure, aluminum foil container 140 is formed of bottom portion 142 and side wall portion 141 rising from the periphery of aluminum foil container 140. A plurality of folds 139 are formed on the side wall 141 all around. By forming the fold 139, a container having the illustrated shape can be obtained from the circular aluminum foil sheet. Such aluminum foil containers are used in large quantities because they are inexpensive and easy to use, such as side dishes for lunch boxes at home, side dishes for commercial lunch boxes for business use, or underlay containers for dough such as pancakes. Have been.

[0003] In order to enable mass production at low cost,
A plurality of aluminum foil sheets are simultaneously press-formed into a predetermined shape, and these aluminum foil containers are manufactured.
Therefore, a predetermined number of aluminum foil sheets stacked on each other before being formed into a container shape are punched into a predetermined shape. The punched laminated aluminum foil sheet is press-formed every specified number of sheets. The mold for molding is divided into an upper mold and a lower mold. The upper mold is moved up and down while the lower mold is fixed, and a laminated aluminum foil sheet is inserted between the molds to form a predetermined shape. The formed laminated aluminum foil container is used as one aluminum foil container while being peeled off one by one at the time of use.

[0004]

Since the conventional aluminum foil container is formed from a single piece of aluminum foil as described above, when punching a laminated aluminum foil sheet, the upper and lower aluminum foil sheets are stacked. They adhere to each other and entangle with each other due to differences in punching pressure and blade sharpness. For this reason, the punched and formed product is less likely to peel. The following methods have been proposed to solve this problem.

[0005] A thin interleaf paper is alternately stacked between an aluminum foil sheet and an aluminum foil sheet to be formed. This method eliminates the entanglement between the aluminum foil sheets, and solves the problem of difficulty in peeling during use. The aluminum foil sheet originally used for the aluminum foil container is a hard aluminum foil, and by selecting the quality of the oil at the time of rolling, a laminated aluminum foil container that can be easily peeled can be formed. By coating with silicone oil, etc.
A wet lubricant is dispersed on the surface of the aluminum foil sheet in a thin and minute amount.

However, the above-mentioned methods have the following problems.

[0007] In the above method, the thickness of the laminated aluminum foil sheet increases. That is, although the thickness of the aluminum foil is relatively thin, 12 to 20 μm, the thickness of the slip sheet is 28 μm or more, which is the thinnest. Therefore, the laminated aluminum foil sheet becomes thick, and the number of laminated aluminum foil sheets cannot be increased. In addition, the interleaf paper becomes unnecessary after use, and there is a problem in terms of effective use of resources.

As for the above, it is technically difficult to leave an appropriate amount of oil during rolling. In addition, even if the type of oil is properly selected, there is a problem of odor if a large amount of the oil remains, and if the amount is small, the required performance of the selected oil will not be satisfied.

In the above-mentioned method, although the peeling property of the laminated aluminum foil container is stable, it is coated with silicon oil even though it is in a trace amount. May cause discomfort.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an aluminum foil container and a method of manufacturing an aluminum foil container which are excellent in releasability and shape retention without using slip paper. The purpose is to provide.

[0011]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 provides an aluminum foil container formed by pressing a laminated aluminum foil sheet. The slip value between the surfaces of the foil sheet is set to a value of 16 or more and 38 or less. With this configuration, the aluminum foil containers are easily peeled off one by one, and the laminated state is stable.

According to a second aspect of the present invention, in the configuration of the first aspect, a slip agent is applied to a surface of the aluminum foil container on the outer surface side. With this configuration, no slip agent remains on the inner surface side of the container.

According to a third aspect of the present invention, there is provided a step of applying a slip agent comprising 3 to 9% by weight of a coconut oil-based natural wax to one entire surface of an aluminum foil sheet, and preparing a plurality of the applied aluminum foil sheets; A step of laminating the laminated aluminum foil sheets in contact with each other via a slipping agent, a step of punching out the laminated aluminum foil sheet, and a step of taking out the laminated aluminum foil of a predetermined shape, and a step in which the slipping agent becomes the outer surface of the container with the extracted laminated aluminum foil Press-forming step. With such a configuration, the slip value of the surfaces where the aluminum foil containers formed by pressing and laminating are in contact with each other is in a desired range.

According to a fourth aspect of the present invention, in the configuration of the third aspect, the amount of the slip agent applied is 0.012 to 0.25.
0.14 g / m ² . With this configuration, the slipping effect of the slip agent is stably exhibited.

[0015]

As described above, according to the first aspect of the present invention, the aluminum foil containers are easily peeled off one by one and the lamination state is stabilized, so that the handling in the lamination state becomes easy. , The usability during use is improved.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the slip agent does not remain on the inner surface of the container, the slip agent directly touches the food or the like when storing the food or the like. There is no.

According to the third aspect of the present invention, the aluminum foil containers are easily peeled off one by one and the laminated state is stable because the sliding value of the surfaces where the laminated aluminum foil containers contact each other is within a desired range. I do.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect of the present invention, a slipping effect is stably exhibited, so that an effective application of a slipping agent is achieved.

[0019]

1 to 6 show a first embodiment of the present invention.
It is a figure showing a schematic process of a manufacturing method of a container made of laminated aluminum foil by an embodiment.

FIG. 1 is a view showing a winding step of winding a pretreated aluminum foil sheet. Referring to the figure, a long strip-shaped aluminum foil is wound around delivery roll 11. As the aluminum foil, for example, a hard aluminum foil having a thickness of 12 μm is used. A slip agent described below is applied to the entire surface of one side of the rolled aluminum foil sheet, which is dried and wound around a delivery roll 11. Is done. Thereby, the odor of the rolling oil at the time of rolling the aluminum foil is also removed. Note that one surface of the aluminum foil sheet is a matte surface, and the other surface is a matte surface. In this embodiment, the slip agent is applied to the matte surface side. The long strip-shaped aluminum foil 14 taken out from the delivery roll 11 is wound on a winding drum 13 rotating clockwise through a guide roll 12. The winding of the winding drum 13 is completed each time the predetermined number of rotations are made, and the process proceeds to the next step in that state.

FIG. 2 is a view showing a large cutting process of the rolled aluminum foil wound on the winding drum 13. As described above, the winding is stopped every time the winding drum 13 rotates a predetermined number of times, so that the wound aluminum foil 15 is formed. Then, by cutting the wound aluminum foil 15 in the cutting section 16 in the axial direction of the winding drum 13,
A laminated aluminum foil sheet on which aluminum foil is laminated can be obtained.

FIG. 3 is a view showing a step of punching the laminated aluminum foil sheet obtained by the step of FIG. 2 into a predetermined shape according to the shape of the aluminum foil container. Referring to the figure,
The air-ventilated laminated aluminum foil sheet 33 is placed on a rubber plate 43 mounted on a frame 45 in a plurality of units, with the separator paper 35 interposed therebetween for each predetermined amount as one unit. In this state, by punching the punched steel 44 having a desired shape corresponding to the aluminum foil container to be formed, a desired punched blank can be sequentially obtained from the end of the laminated aluminum foil sheet 33 containing the partition paper. it can. In addition, since the partition paper 35 was impregnated with the wax, the punching was performed smoothly by the punch 44,
The punched surface becomes smoother.

FIG. 4 is a perspective view showing the external shape of the punched blank obtained in the step of FIG. Referring to the figure, in this embodiment, since punching blank 50 is premised on a round aluminum foil container, each of forming unit sheets 49 bounded by the obtained partition paper has a disk shape. are doing. The number of laminated aluminum foils 53 included in each forming unit sheet 49 is about 50 used for one forming operation. In the configuration of each of the molding unit sheets 49, the uppermost surface is a punching partition paper 51,
Subsequently, a predetermined number of laminated aluminum foils 53 are continuously formed.

FIG. 5 is an exploded perspective view showing a schematic structure of a forming apparatus for forming an aluminum foil container from a set of forming unit sheets 49 taken out from the blank of FIG.
Referring to the drawing, a molding apparatus includes a first mold member 129 and a second mold member 117 that opposes first mold member 129 via a laminated aluminum foil sheet (not shown) that is a molded object. Consists of

The first mold member 129 has a cylindrical shape, which is one of the hollow pillars, and its upper wall has a cylindrical body 161.
Of the cylindrical body 161
A first step groove 119 radiating from the central axis of the first groove 119 is formed. The inner wall 121 of the cylindrical body 161 has a second
Are formed, and the first step groove 119 and the second step groove 122 are connected to each other. Also, the first
An edge 163 is fixed to the outer edge of the step groove 119 on the cylindrical body 161.

On the other hand, the second mold member 117 includes a cylindrical push-shaped push rod 148 and a conical body 155 in which the punch-shaped push rod 148 can be freely inserted into and removed from an opening 157 formed at the center thereof. Consists of A tapered portion 152 is formed at the tip of the punch-shaped push rod 148, and a gear-shaped groove 147 is formed on the peripheral wall thereof in parallel with the axial direction.
A bevel gear-shaped groove 159 is formed on the side wall of the cone 155. Each of the gear-shaped groove 147 and the bevel gear-shaped groove 159 is provided so as to correspond to the number and position of the convex portions of the first step groove 119 and the second step groove 122 of the first mold member 129. I have.

FIG. 6 shows one of the blanks taken from the blank of FIG.
FIG. 6 is a diagram illustrating a mounting step of mounting a set of forming unit sheets 49 on the forming apparatus illustrated in FIG. 5.

The forming unit sheet 49 easily taken out by shifting the blank 50 is placed on the first step groove 119 of the first mold member 129 of the forming apparatus with its upside down. By placing in this manner, the uppermost surface of the molding unit sheet 49 becomes the matte surface of the laminated aluminum foil 53, and the punching partition paper 51 is located at the lowermost portion. In this state, the inner surface of the aluminum foil container formed by the lowering of the second mold member 117 becomes a matte surface of the aluminum foil, which is preferable according to the food material to be accommodated.

On the other hand, since the punched partition paper 51 is located at the lowermost part of the molding unit sheet 49, it serves as a cushion at the time of molding and protects the laminated aluminum foil 53.

FIG. 7 is an external perspective view of the laminated aluminum foil container obtained in the forming step shown in FIG. Referring to the drawing, laminated aluminum foil container 65 is in a state where a plurality of aluminum foil containers 140 shown in FIG. 9 as a conventional example are directly superimposed. As a result, the following effects can be obtained with respect to the one in which the slip sheet is inserted.

By omitting the interleaving paper, the cost of the interleaving paper is reduced, and the volume is reduced by about 70% as compared with the one containing the interleaving paper. Therefore, compared with the same number of laminated aluminum foil sheets and aluminum foil containers, Its volume is reduced and distribution cost is 70%
Can be omitted.

Further, the efficiency of the molding operation is improved. In the case of a sheet with interleaf paper, the total thickness of one set of laminated aluminum foil sheets is 40 μm.
Eight sets were molded at one time. However, in the case of this embodiment, the thickness of one set (sheet) of the laminated aluminum foil sheet is 12
μm, about 50 to 60 sheets can be formed at one time, and more aluminum foil containers
It is possible to manufacture by a degree of molding.

Next, the following table shows the experimental results on the quality of handling of the laminated aluminum foil container shown in FIG.

[0034]

[Table 1] 1. Regarding Samples In each of Samples 1 to 6, a hard aluminum foil having a thickness of 12 μm was used. For sample 1, no slip agent was applied. Samples 2 to 6 were prepared by applying a slip coat agent containing a slip agent composed of 3 to 12% by weight of a coconut oil-based natural wax to a synthetic resin binder dissolved in a solvent on one side of a hard aluminum foil. 0.14 g / m ^{2 was} applied. 2. About the measurement of a slip value The measurement of the slip value was performed according to the inclination method prescribed | regulated to JISP8147. FIG. 8 is a diagram for explaining a main part of the tilt method.

Referring to the drawing, a main body test piece 72 is placed on an inclined plate 71 whose inclination angle θ can be freely changed.
Is attached. On the other hand, a weight 73 having a weight W of 1 kg
A weight test piece 74 is attached to the lower surface and side surfaces of the test piece. Then, the weight test piece 74 is placed so as to be placed on the main body test piece 72, and the inclination angle θ is gradually increased. Then, as the inclination of the inclined plate 71 increases, the inclination angle θ when the weight 73 starts to slide is measured.
Record nθ × 100 as the slip value.

The test piece for the main body 72 was 85 mm wide and 250 mm long as the test piece 72 for the main body, and the test piece 74 for the weight was used.
Each having a width of 60 mm and a length of 120 mm was prepared. The main body test piece 72 is attached such that the surface on which the slipping agent is not applied is on the side of the weight test piece 74.
It was attached to the weight 73 so as to be on the side. The reason why the surface to which the slip agent is applied is specified in this manner is to make the laminated aluminum foil container as close as possible to the actual laminated state. The measurement was performed five times for each sample, the average inclination angle was measured, and this was recorded as a slip value. 3. Test method As a test of the peelability after molding, the time required for peeling off 50 sheets of the laminated aluminum foil container after molding with the forefinger and thumb was used. Measure,
This was evaluated as peelability.

The laminated aluminum foil container must not be separated from the accumulation container until it is packaged after it is molded, or separated by vibration during transportation.
On the other hand, in the case of aluminum foil containers, there are various types of side walls, that is, folds having a height of 20 to 45 mm.
The container was made of a laminated aluminum foil having a thickness of 2 mm and its shape retention was tested.

More specifically, a container made of laminated aluminum foil is dropped from a height of 80 cm and the laminated state is maintained (excellent). A little space is seen in each layer, but the laminated state as a whole is Is maintained as "good", and peeling between layers is not acceptable if the state is not maintained
Was evaluated. The “height of 80 cm” is defined as the height from the bottom of the box to the shooter of the box and the height of the normal table when discharging the container from the shooter into the storage box after molding the laminated aluminum foil container. It is assumed. 4. Test Results (1) The slip value is preferably more than 10 and 38 or less. This is because, when the slip value is 10 or less, the laminated state cannot be maintained when falling, and when the slip value exceeds 38, it is difficult to peel off. Note that the slip value is determined by the amount of the slip agent, and in relation to the slip value, it is more than 3% by weight and less than 12% by weight.

(2) The amount of the slip agent applied does not significantly affect the slip value. That is, it may be about 0.01 to 0.15 g / m ² . That is, if the amount is less than 0.01 g / m ^2, there is a possibility that the coating of the slip agent may be broken, and if the amount exceeds 0.15 g / m ² , the sliding effect is not so effective. In the above-described embodiment, the slip agent is applied to the surface of the aluminum foil container on the outer surface side. However, depending on the use of the container, the slip agent is applied to the inner surface of the container or both surfaces of the container with a predetermined slip value. May be applied.

In the above embodiment, one side of the aluminum foil sheet is used as the matte side, and the other side is used as the matte side. This depends on the use of the aluminum foil container. Therefore, depending on the application, it may be a matte surface or a matte surface with both surfaces.

[Brief description of the drawings]

FIG. 1 is a view showing a winding step of winding an aluminum foil in a manufacturing step of a laminated aluminum foil container according to a first embodiment of the present invention.

FIG. 2 is a view showing a large-size cutting process of a rolled aluminum foil in a manufacturing process of the laminated aluminum foil container according to the first embodiment of the present invention.

FIG. 3 is a view showing a punching step of punching a laminated aluminum foil sheet into a predetermined shape in a manufacturing step of the laminated aluminum foil container according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing the external shape of a punched blank obtained in the step of FIG.

5 is an exploded perspective view showing a schematic configuration of a forming apparatus for forming a laminated aluminum foil container from a set of forming unit sheets taken out from the blank of FIG.

FIG. 6 shows a placing step of placing a forming unit sheet taken out from a blank in the forming apparatus shown in FIG. 5 in a manufacturing step of the laminated aluminum foil container according to the first embodiment of the present invention. FIG.

7 is an external perspective view of the laminated aluminum foil container obtained in the forming step shown in FIG.

FIG. 8 is a diagram for explaining specific contents of a tilt method defined in JISP8147.

FIG. 9 is a perspective view showing the appearance of a conventional aluminum foil container.

[Explanation of symbols]

 33 ... Laminated aluminum foil sheet 44 ... Punched steel 49 ... Molded unit sheet 50 ... Punched blank 53 ... Laminated aluminum foil 65 ... Laminated aluminum foil container 140 ... Aluminum foil container The same reference numerals in each drawing indicate the same or corresponding parts. Is shown.

Claims (4)

[Claims] 1. An aluminum foil container formed by press-forming a laminated aluminum foil sheet, wherein a slip value between adjacent aluminum foil sheet surfaces is set to a value of 16 or more and 38 or less. Characterized by aluminum foil container. 2. The aluminum foil container according to claim 1, wherein a slipping agent is applied to a surface of the aluminum foil container on the outer surface side. 3. A step of applying a slip agent composed of 3 to 9% by weight of a coconut oil-based natural wax to one entire surface of the aluminum foil sheet; and preparing a plurality of the applied aluminum foil sheets and passing the slip agent through the slip agent. Laminating in a manner in which they are in contact with each other, punching out the laminated aluminum foil sheet, and taking out a laminated aluminum foil having a predetermined shape, and removing the laminated aluminum foil from the container so that the slip agent becomes an outer surface of the container. And a press molding step. 4. The coating amount of the slip agent is 0.012 to
Is 0.14 g / ^{m 2,} a manufacturing method of an aluminum foil container made according to claim 3, wherein.