JP3315326B2 - Laminated aluminum foil and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated aluminum foil and a method for producing the same, and more particularly to a laminated aluminum foil for forming an aluminum foil container for containing various foods and a method for producing the same.

[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 145 includes bottom 143 and side wall 1 rising from the periphery of bottom 143.
41. A plurality of folds 139 are formed on the entire side wall 141. This fold 139
Thus, a container having such a shape can be obtained from a circular aluminum foil sheet.

FIG. 10 is a perspective view of a laminated flat aluminum foil for manufacturing the aluminum foil container shown in FIG. 9 disclosed in Japanese Patent Publication No. 8-15979, and FIG.
FIG. 2 is a partially enlarged longitudinal sectional view of a laminated flat aluminum foil of No. 0. With reference to these figures, A shows several hundred flat aluminum foils 101,
For example, it is a laminated flat aluminum foil for forming an aluminum foil container formed by laminating 500 sheets. Furthermore, 5 of the flat aluminum foil 101
A thin paper 102 for separation having the same size and shape as the flat aluminum foil 101 and a slip sheet 103 are interposed in a superposed state for every unit number a, such as 10 sheets or 20 sheets.

[0004] As the thin paper 102 for separation, thin paper such as glassine paper having smooth front and back surfaces 102a and 102b is used, and these smooth surfaces 102a and 102b are used.
Are in close contact with the flat aluminum foil 101 and the slip sheet 103, while the slip sheet 103 is made of thin paper or synthetic paper, and the side contacting the flat aluminum foil 101 is placed on the smooth surface 103a. Thin paper is used in which a polymerized surface with the separating thin paper 102 is formed on a rough surface 103b having fine irregularities. The separation thin paper 102 and the interleaf 103 are made of non-breathable material.

[0005] With this configuration, the flat aluminum foil 1
The thin paper 102 for separation and the slip sheet 103 interposed every unit number a of 01 have their smooth surfaces 102a, 103a brought into close contact with the opposing flat aluminum foil 101 having the same smooth surface. Therefore, the coefficient of friction of each close contact surface is large, while the rough surface 103b of the slip sheet 103 is in close contact with the other smooth surface 102b of the separation thin paper 102. In addition, the coefficient of friction is reduced by air in the minute gap formed between the two.

[0006] Therefore, the laminated flat aluminum foil A shown in FIG.
As shown in FIG. 11, for example, when the upper surface of the laminated flat aluminum foil A is shifted in the horizontal direction while holding it by hand, the flat aluminum foils 101 and 101 and the flat aluminum foil 101 in contact with the separating thin paper 102 are in close contact with each other. However, the close contact surfaces of the separating thin paper 102 and the slip sheet 103 having a small coefficient of friction are separated while sliding with each other. Therefore, the flat aluminum foils 101 are sequentially shifted in a stepwise manner for each unit number a through the thin paper 102 for separation and the interleaf sheet 103, so that one or several sets of the unit aluminum foil 101 can be easily taken out. it can.

FIG. 12 is an exploded perspective view showing a schematic structure of a conventional molding apparatus for an aluminum foil container. Referring to the drawing, the molding device faces first mold member 129 via first mold member 129 and laminated flat aluminum foil (not shown) shown in FIGS. And a second mold member 117.

[0008] The first mold member 129 has a cylindrical shape which is one of 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. In addition, a second step groove 122 is formed on the inner wall 121 of the cylindrical body 161, and the first step groove 119 and the second step groove 122 are formed.
Are connected to each other. An edge 163 is fixed to the outer edge of the first step groove 119 on the cylindrical body 161.

On the other hand, the second mold member 117 is a conical body in which a punch-shaped pusher 149 having a columnar shape and an opening 157 formed in the center of the punch-shaped pusher 149 can be freely inserted and removed. 155. The tip of the punch-shaped pusher 149 is formed with a tapered portion 153 that is tapered, and a gear-shaped groove 151 is formed on its peripheral wall 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 151 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 of the first mold member 129.

At the time of molding, the cone 155 and the punch 14
9 is lowered together with the first step member 119 of the first mold member 129 to press the laminated flat aluminum foil to form a fold of the aluminum foil container, and then only the punch-like press 149 is formed. Is further lowered into the second step groove 122 of the first mold member 129 to form a laminated aluminum foil container in which a plurality of aluminum foil containers of FIG. 9 are stacked.

[0011]

In the conventional laminated flat aluminum foil as described above, one or a plurality of flat aluminum foils per unit number a can be easily formed as shown in FIGS. Can be taken out. However, two sheets of the separating thin paper 102 and the slip sheet 103 are required for each separation location in order to separate the unit number a, and the lamination height of the laminated flat aluminum foil is increased by that amount. .

Further, since the flat aluminum foils are merely laminated, there is a possibility that the flat aluminum foil layers are displaced during press forming and the aluminum foil is damaged. The present invention has been made to solve the above-described problems, and the invention according to claim 1 aims to provide a laminated aluminum foil that can be easily separated by a single sheet of paper into a unit number of sheets. is there.

Another object of the present invention is to provide a method for producing a laminated aluminum foil which prevents breakage of the aluminum foil during press forming. A fourth aspect of the present invention is to provide a method of manufacturing a laminated aluminum foil for preventing breakage of an aluminum foil at an end when forming an aluminum foil container in addition to the configuration of the third aspect of the invention. .

[0014]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of sets of interleaving papers are laminated on a flat aluminum foil, and Laminated aluminum foil for forming an aluminum foil container by stacking a plurality of paper sheets on top of each other with one set laminated, the static friction coefficient of the surface facing the partition paper and the flat aluminum foil is The coefficient of static friction is smaller than the coefficient of static friction of the surface facing the partition paper and the slip sheet and the coefficient of static friction of the surface facing the slip sheet and the aluminum foil.

According to a third aspect of the present invention, there is provided a method of manufacturing a laminated aluminum foil for forming an aluminum foil container, wherein a composite aluminum foil is formed by laminating a plurality of sets in which an interleaf is laminated on a flat aluminum foil. Forming a composite aluminum foil, laminating a plurality of sets of composite aluminum foil with a partition paper on which a partition paper is placed on top of the composite aluminum foil, and vertically stacking the laminated composite aluminum foil with a partition paper. The method includes a step of compressing and a step of punching the compressed aluminum composite layer containing the partition paper into a predetermined shape.

According to a fourth aspect of the present invention, in addition to the constitution of the third aspect, the stamped aluminum composite layer containing the partition paper is separated at the part of the partition paper and the flat aluminum foil and taken out as a laminated aluminum foil. And a step of setting the laminated aluminum foil in the forming apparatus so that the opposite surface of the partition paper is pressed by the pressing die of the forming apparatus.

[0017]

As described above, according to the first aspect of the present invention, the static friction coefficient of the surface facing the partition paper and the flat aluminum foil is determined by the static friction coefficient and the static friction coefficient of the surface facing the partition paper and the slip sheet. Since the coefficient of static friction is smaller than the coefficient of static friction of the surface facing the paper and the aluminum foil, if the laminate aluminum foil is displaced by applying a force in the lateral direction, the gap between the partition paper and the aluminum foil in contact with it And the flat aluminum foil including the unit number of slip sheets laminated between the partition sheets can be easily taken out.

According to a third aspect of the present invention, air is discharged between layers by providing a step of vertically compressing the laminated composite aluminum foil containing partition paper to reduce the displacement between the flat aluminum foil and the interleaf paper. Thus, it is possible to produce a laminated aluminum foil in which the aluminum foil is prevented from being damaged during press molding.
The invention according to claim 4 includes, in addition to the effect of the invention according to claim 3, a step of setting the laminated aluminum foil composite layer in the forming apparatus such that the opposite surface of the partition paper is pressed by the pressing mold of the forming apparatus. Therefore, the partition paper faces the mold member on the side receiving the pressing force of the pressing die of the molding apparatus, and the aluminum foil at the end portion during molding is prevented from being damaged.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 8 are views showing respective steps of a manufacturing process of a laminated aluminum foil according to a first embodiment of the present invention. FIG. 1 is a diagram illustrating a winding step of winding the aluminum foil and the interleaving paper in a stacked state.

Referring to the drawing, the long strip-shaped interleaf 15
, And the long strip-shaped aluminum foil is wound around the second delivery roll 17. On the slip sheet,
For example, glassine paper (weighing 30.5 g / m ² , thickness 28μ)
Thin paper having a smooth front surface and a slightly rough back surface as in m) is used. Aluminum foil has a thickness of, for example, 12
A μm aluminum foil is used. The long strip-shaped interleaf 15 taken out from the first delivery roll 13 is superimposed on the long strip-shaped aluminum foil taken out from the second delivery roll 17, and is rotated clockwise through the guide roll 21. It is wound on a rotating winding drum 23.

Here, the surface in contact with the long strip-shaped aluminum foil 19 of the long strip-shaped interleaf 15 is the surface, while the surface in contact with the long strip-shaped interleaf 15 in the long strip-shaped aluminum foil 19 is more. It has a smooth glossy surface. In this way, the long strip-shaped interleaf paper 15 and the long strip-shaped aluminum foil 19 are wound around the winding drum 23 by contacting the smooth surfaces thereof with each other to reduce the air entering at the time of superposition. This is to reduce it.

The winding of the winding drum 23 is completed every 125 rotations, and the process proceeds to the next step in that state. FIG. 2 is a diagram showing a large-size cutting process of the rolled aluminum foil wound on the winding drum 23. As described above, the winding is stopped every time the winding drum 23 rotates 125 times, so that the interleaf paper and the aluminum foil are alternately placed on the winding drum 23 for each 12 hours.
The rolled aluminum foil 25 is formed by superimposing five sheets at a time. Then, the aluminum foil 25 wound in the axial direction of the winding drum 23 is cut at the cutting section 27, for example, in a rectangular shape having a width of 1100 mm and a length of 1600 mm, and each of the aluminum foil and the interleaf paper is 125 sheets It is possible to obtain a composite aluminum foil which is superposed one by one.

FIG. 3 is a view showing a step of decoratively trimming the composite aluminum foil obtained in the step of FIG. Since the composite aluminum foil obtained in the step of FIG. 2 is obtained by cutting the one wound on the winding drum 23, the end is not perpendicular to the surface of the aluminum foil and the slip sheet, It has an inclined surface. Therefore, in order to finish the end of the composite aluminum foil 29 perpendicular to the surface of the aluminum foil or the like, the shearing cutter 31 is used.
a, 31b is used for makeup trimming. Then, using the shearing cutters 31a and 31b, the composite aluminum foil 29
Divided into four parts, for example, a width of 546 mm and a length of 788 mm
Of flat size, width 457mm, length 686mm
To obtain a composite aluminum foil with a plane size of This makes it possible to obtain a composite aluminum foil whose end faces are aligned and whose size is easy to handle.

Next, although not shown, a predetermined size is set.
The cut composite aluminum foil 29 is stacked in four layers,
One piece of 500 pieces each of Lumi foil and interleaf paper
And stack them. And this piled up
Take out about 50 to 10 sheets from the composite aluminum foil and
The three surfaces are perpendicular to each other with a partition paper as a unit
Stack up on wooden workbench. Here, like a partition paper
6g / m wax ^Two Kraft paper impregnated with a degree
50.0 g / m^Two , Thickness 75 μm). This
In the case of wooden workbench, it is easy to carry
Before placing the first unit of composite aluminum foil,
Is preferably placed.

FIG. 4 is a view showing a process for stacking a large number of composite aluminum foils containing partition paper and removing air interposed therein. The composite aluminum foil 36 containing the partition paper placed on the wooden work table, as described above, is taken out and placed on the mounting table 39 via the cardboard 37. In this case, it is preferable that each of the aluminum foil and the interleaf included in the stacked composite aluminum foil 36 with a partition paper is about 2,000 sheets. In this state, a weight 41 of about 100 kg is placed on the entire upper surface of the composite aluminum foil 36 containing the partition paper. This state is maintained for 24 hours or more, and the air contained between the aluminum foil and the slip sheet is vented. To remove air like this,
In order to prevent slippage by making the glossy surface of the aluminum foil and the surface of the interleaf paper, that is, the smooth surface, adhere to each other, and to suppress the displacement between the layers when forming aluminum containers in the subsequent process, a large number of aluminum foil Is required to be integrally formed. If the layers are displaced during molding, a uniform molded container cannot be obtained, and the aluminum foil tends to be broken.

FIG. 5 is a view showing a step of punching the composite aluminum foil containing the partition paper from which the air has been vented in the step of FIG. 4 into a predetermined shape according to the shape of the aluminum foil container. Referring to the figure, a predetermined amount of the composite aluminum foil containing the ventilated separator paper, for example, 500 parts each of the aluminum foil and the interleaf paper were added.
About one sheet is set as one unit and placed on the rubber plate 43 mounted on the frame 45. In this state, a desired punched blank can be sequentially obtained from the end of the composite aluminum foil 36 with the partition paper by descending a punching girder 47 having a desired shape corresponding to the aluminum foil container to be formed. it can. In addition, since the partition paper 35 is impregnated with the wax as described above, the punching by the punch 47 is performed smoothly, and the punched surface becomes smoother.

FIG. 6 is a perspective view showing the external shape of the punched blank obtained in the step of FIG. Referring to the drawing, in this embodiment, punched blank 50 is premised on a round aluminum foil container, and thus each of laminated aluminum foils 49 bordering the obtained partition paper has a disk shape. are doing. The aluminum foil and the interleaf paper included in each of the laminated aluminum foils 49 are used for one molding operation.
It is about 0 sheets. Each of the laminated aluminum foils 49 has a configuration in which the uppermost surface is a punching partition paper 51, and subsequently, a predetermined number of punching slip sheets 55 and punching aluminum foils 57 are alternately repeated. Therefore,
At the boundary between the upper laminated aluminum foil 49 and the lower laminated aluminum foil 49, the upper punched aluminum foil 57 and the lower punched separating paper 51 face.

When a force is applied so as to shift the punching blank 50 in such a state in the horizontal direction, as shown in FIGS. 6 and 7, each laminated aluminum foil 49 becomes a punching partition paper 51 and an upper partition of the punching partition paper 51. Punched aluminum foil 5 of laminated aluminum foil 49
7 for each laminated aluminum foil 49.
This makes it easy to place each of the laminated aluminum foils 49 on the forming apparatus in the next step.

Here, the following table shows the experimental results of the frictional force on the surfaces of each of the laminated aluminum foils 49 that come into contact with the partition paper, the interleaf paper and the aluminum foil.
The static friction and the dynamic friction inclination angles shown in Tables 1 and 2 are based on JI.
It is the result of using a measuring instrument based on SP8147.

[0030]

[Table 1]

[0031]

[Table 2]

As is clear from Table 1, when kraft paper is used as the partition paper, the static friction coefficients are compared. The static friction coefficient at each measurement point is A>C-1> B.
It is -1. That is, the portion (B-1) where the erased surface of the aluminum foil 57 and the surface of the kraft paper 51 are in contact has the lowest static friction coefficient. Therefore, when a force is applied so as to shift the blank in which these are laminated in the lateral direction, FIGS.
Stamped aluminum foil 57 and partition paper 5 as shown by
1 will be shifted.

Table 2 shows the result of measuring the magnitude of the friction of the target surface using the inclination angle as a scale instead of the method of measuring the friction in Table 1, and the relative relationship of the friction in the measurement result is as follows. The results are almost identical to those obtained in Table 1.
In order to ensure the accuracy of the experiment, the same measurement was repeated four times. FIG. 8 is a view showing a placing step of placing a set of laminated aluminum foils 49 taken out from the blank of FIG. 6 on a molding apparatus.

The laminated aluminum foil 49 easily taken out by shifting the blank 50 is turned upside down and placed on the first step groove 119 of the first mold member 129 of the forming apparatus. With this placement, the uppermost surface of the laminated aluminum foil 49 becomes the erased surface of the punched aluminum foil, and the punched 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 depending on the food material to be stored.

On the other hand, since the punching partition paper 51 is located at the lowermost part of the laminated aluminum foil 49, the punching slip paper 55 thereon
At the same time, it serves as a cushion to protect the punched aluminum foil 57. If the punched partition paper 51 is not set at the lowermost portion, the lowermost aluminum foil or the like is easily broken at the time of molding, and if broken, the damaged aluminum foil is placed in the inner wall 121 of the second mold member 129. This is because they may get in and it is difficult to take them out.

The uppermost surface of the laminated aluminum foil 49 has the punched aluminum foil 57 positioned thereon as described above, and the first mold member 117 moves downward. In general, however, the first mold member 117 of the forming apparatus is used. In many cases, a resin mold is used, and even if the aluminum foil is directly pressed, the aluminum foil on the uppermost surface is hardly damaged. Although kraft paper is used as the partition paper in the above embodiment, newspaper paper (weighing 51.8 g / m ² , thickness 63) is used instead of kraft paper from the viewpoint of waste material utilization.
μm) can also be used. Tables 1 and 2 show data on friction between components when newsprint is used as the partition paper. According to this, the static friction coefficient at each measurement point when using newspaper was C-2>A> B-
2, and the coefficient of static friction on the surface between the erased surface of the aluminum foil and the newspaper is the smallest as compared with other portions. Therefore, even when newsprint is used as the partition paper, the laminated aluminum foil is easily displaced and separated between the newsprint and the aluminum foil on the upper surface thereof, so that the desired unit of laminated aluminum foil can be easily taken out. it can.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a large-size cutting process of the wound aluminum foil 25 wound on a winding drum in FIG.

FIG. 3 is a view showing a step of decoratively trimming the composite aluminum foil taken out in the step of FIG. 2;

FIG. 4 is a view showing an air bleeding step for stacking composite aluminum foil cut into a predetermined shape in the step of FIG. 3 and taking out air inside the composite aluminum foil.

FIG. 5 is a view showing a punching step of punching the composite aluminum foil containing the partition paper from which air has been vented in the step of FIG. 4 into a predetermined shape.

6 is a perspective view showing a state in which a lateral force is applied to the blank punched in the step of FIG. 5 to shift the upper part of the laminated aluminum foil.

FIG. 7 is an enlarged sectional view showing the configuration of a laminated aluminum foil 49 in the state shown in FIG. 6;

FIG. 8 shows a laminated aluminum foil 49 from the blank shown in FIG.
FIG. 4 is a view showing a mounting process in a state where the device is taken out and mounted on a molding apparatus.

FIG. 9 is a perspective view showing an external shape of a conventional aluminum foil container.

FIG. 10 is a perspective view showing a configuration of a punched blank for manufacturing the aluminum foil container of FIG. 9;

11 is a view showing a configuration of a boundary portion of a flat aluminum foil for each unit number when a force is applied in the left-right direction in the blank of FIG.

12 is a perspective view showing a structure of a forming apparatus for manufacturing the aluminum foil container of FIG. 9 from the blank shown in FIG.

[Explanation of symbols]

 29 ・ ・ ・ Composite aluminum foil 33 ・ ・ ・ Unit composite aluminum foil 35 ・ ・ ・ Partition paper 36 ・ ・ ・ Composite aluminum foil with partition paper 49 ・ ・ ・ Laminated aluminum foil 51 ・ ・ ・ Punched partition paper 53 ・ ・ ・ Punching Composite aluminum foil 55 ··· punched interleaving paper 57 ··· punched aluminum foil Note that the same reference numerals in each drawing denote the same or corresponding parts.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 51/18 B26F 1/38 B65D 1/26 B65D 21/02 B65H 3/00 B65H 39/16

Claims (4)

(57) [Claims] 1. A plurality of sets in which an interleaf is superimposed on a flat aluminum foil are laminated, and a partition paper is superimposed on the uppermost interleaf to obtain 1
A laminated aluminum foil for forming an aluminum foil container in which a plurality of sets are laminated, wherein a coefficient of static friction of a surface of the partition paper and the flat aluminum foil facing each other is determined by a coefficient of static friction between the partition paper and the flat aluminum foil. A laminated aluminum foil having a coefficient of static friction smaller than a coefficient of static friction of a surface facing paper and a coefficient of static friction of a surface facing the interleaf paper and the aluminum foil. 2. The one set of the laminated aluminum foil,
The laminated aluminum foil according to claim 1, which corresponds to the number of aluminum foil containers to be pressed at one time by a molding device. 3. A method for producing a laminated aluminum foil for forming an aluminum foil container, comprising the steps of forming a composite aluminum foil by laminating a plurality of sets of laminated interleaving paper on a flat aluminum foil. A step of laminating a plurality of sets of composite aluminum foil with a partition paper on which a partition paper is placed on the top of the composite aluminum foil, and a step of vertically compressing the laminated composite aluminum foil with a partition paper, Punching the compressed aluminum composite layer containing the partition paper into a predetermined shape. 4. A step of separating the punched-out aluminum composite layer containing a partition paper at a part of the partition paper and the flat aluminum foil and taking out the laminated aluminum foil as a laminated aluminum foil; 4. The method for producing a laminated aluminum foil according to claim 3, further comprising the step of: setting the surface on the molding device so that a pressing die of the molding device presses the surface.