JPH07109535A - Patterned aluminum foil - Google Patents

Abstract

PURPOSE:To produce a curt-free high quality patterned Al foil by specifying the size and dimensions of a pattern shape of a patterned Al foil as a packaging material, respectively. CONSTITUTION:At the time of producing a patterned Al foil used for packaging food, chemicals, etc., and having fine patterns or a patterned laminated Al foil prepared by laminating the foil on paper, plastic film, etc., the thickness of an Al foil is regulated to <=70mum and this Al foil is pressed to form a square- shaped pattern which consists of high ridge lines 1, low ridge lines 2, original Al foil planes 3, and inclined planes 4, 5 connecting them and in which pitch is regulated to 20-200mesh. At this time, a relation of h2/h1=0.1 to 0.6 is provided between the height h1 of the high ridge line 1 of the pattern with respect to the foil plane 3 and the height h2 of the low ridge line 2. Moreover, the high ridge lines 1 are formed in a direction orthogonal to a curl direction when the direction where curl is liable to occur is previously found, or, the high ridge lines 1 are formed in a direction forming an angle of inclination of about 45 degrees with the machine direction of the foil when the curl direction is not fixed.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention can be used in all fields mainly used as materials for flexible packaging, such as foods, drugs, quasi-drugs, constructions, industries, households and office supplies. , An improved shaped aluminum foil or a shaped aluminum composite foil.

[0002]

2. Description of the Related Art Aluminum foil has excellent characteristics such as light weight, beautifulness, easy handling, light-shielding property, oxygen barrier property, and cost.
It is widely used in the field of packaging materials by laminating it with a plastic film or printing it.

In this case, an aluminum foil which is simply rolled is widely used, but an aluminum foil which has a fine pattern for the purpose of giving a high-grade feeling, improving handleability and workability is also used in various fields. Widely used in.

This typed aluminum foil or a typed aluminum composite foil using the typed aluminum foil is likely to be curled when a pattern is formed on the pattern, resulting in poor mechanical suitability. Once the curl occurs, it is caught in the packaging of an automatic packaging line, a filling and sealing machine, etc., and a line trouble such as foil clogging occurs.

For this reason, many proposals have been made in the past to prevent curling of the aluminum foil with a mold. For example,
The depth of the mold is made shallow (stable molding is not possible), the pattern of the mold, the pattern, the size of the pitch, etc. are changed (the image and feeling change), and the foil flows in the direction of the ridgeline of the mold. Diagonal with respect to the direction, change the molding direction from the front side to the back side, change the thickness of aluminum foil or composite foil, in composite foil, change the composition and material of the base material, change the material of aluminum foil, etc. There was,
There is no definitive means, and curling elimination was an important theme for aluminum foil or patterned aluminum foil.

[0006]

DISCLOSURE OF THE INVENTION The present invention not only prevents curling of the aluminum foil with a mold or an aluminum composite foil with a mold when the aluminum foil is molded, but also provides a curled aluminum foil before molding. The purpose is to develop a patterned aluminum foil having a pattern that allows curling to be corrected by patterning.

[0007]

The present invention has a thickness of 70 μm.
Hereinafter, the pattern pitch is 20 to 200 mesh, and the relationship between the height h ₁ of the high ridge and the height h ₂ of the low ridge is h ₂ / h ₁ = 0.1 to 0.6. The above object was achieved by developing a moldable aluminum foil.

The aluminum foil which is the object of the present invention is pure aluminum such as 1N30, which is usually used for patterning aluminum foil, Al--Mn type, Al--Fe type, Al.
-Cu-based aluminum alloys and the like can be used. As for the thickness, the maximum thickness before molding is 70 μm or less when it is a single aluminum foil, and when it is laminated with other materials, the total thickness when the aluminum foil occupies 40% or more of the total thickness The thickness is preferably 175 μm (70 μm as an aluminum foil) or less.

If the aluminum foil is thicker than 70 μm,
Alternatively, when the aluminum foil in the composite foil is less than 40% of the total thickness, it becomes difficult to form a pattern stably and clearly.

There is no particular reason to limit the pattern as long as it has a pitch of about 20 to 200 mesh, but it is preferable that the pattern on the press board is a square pattern for easy production.

When the pitch of the pattern is larger than 200 mesh (the size of the pattern becomes small), the patterning tends to be unclear, and the effect tends to decrease. On the other hand, when the mesh size is smaller than 20 meshes (the size of the pattern becomes large), not only curling prevention and curling correction effects are deteriorated, but also tearing is likely to occur at the time of molding.

Below, an example of the pattern (FIGS. 1 and 2)
Will be explained. FIG. 1 shows a stamped foil having a high ridge line (vertical line) 1, a low ridge line (horizontal line) 2, an original aluminum foil surface 3, and inclined surfaces 4 and 5 connecting them by pressing an aluminum foil. Is.

In this case, the height of the high ridge line 1 (height between the foil surface 3) h ₁ and the height of the low ridge line 2 (height between the foil surface 3) h _{2 as shown in FIG.} And

In the present invention, this relationship is h ₂ /
h ₁ = 0.1-0.6, preferably h ₂ / h ₁ = 0.2
It is necessary to be 0.5.

In this case, since the high ridge line h ₁ > the low ridge line h ₂ , the high ridge line has a resistance against the curling and bending of the mold foil, and the curling of the foil in this direction can be prevented. Become.

Further, when the shape of the product and the direction in which it is easy to curl are known in advance by an automatic wrapping machine, it is effective to make the high ridge line orthogonal to the curl direction.

Alternatively, when the curling direction is not constant (when curling in both the flow direction and the width direction)
It is effective to make the high ridge line at an angle of about 45 ° to the flow direction.

The patterned aluminum foil of the present invention can be used satisfactorily as it is, but printing, corrosion resistance coating, adhesive coating, printing + overcoating or printing + adhesive coating, etc. on one or both sides thereof It is needless to say that it can also be used as a composite foil by coating the above, laminating paper or plastic film with glue or wax, and the like; plastic film with dry laminating, wet laminating, melt extrusion laminating, and the like.

[0019]

[Function] Aluminum foil or aluminum composite foil,
The precise theory of curling by the shaping operation, curling prevention by the shaping operation and curling aluminum foil or composite foil before shaping is not yet understood, but as follows. It is presumed that this is due to a different mechanism.

That is, in the present invention, the pattern is composed of a combination of a high ridge line, a low ridge line, an inclined surface from the ridge line and a non-processed surface, and the high ridge line is almost formed in the curl direction of the aluminum foil or the composite foil. Since it is inserted in the right angle direction, the curl is prevented by the rigidity of the high ridge. In addition, even when the curl is applied before the die is formed, the high ridge line is inserted in a direction substantially perpendicular to the direction of the curl, so that the curl that has occurred before that is corrected and the flat aluminum foil (composite Foil) is considered to be obtained.

[0021]

【Example】

(Example 1) An ethylene-acrylic acid copolymer film having a thickness of 15 μm was attached to the other surface of an aluminum foil coated with 1 N30 having a thickness of 12 μm on one surface by dry lamination, and the total thickness before patterning was 33 μm. Of aluminum composite foil was prepared. In the composite foil, a height of a ridge line having a pattern shape shown in FIG. 1 having a size of 150 mesh is inserted in a direction of 45 ° with respect to the flow direction, and the total thickness after the die attachment (total thickness before die attachment + h ₁ ) The mold roll was made of metal and the receiving roll was a paper roll, and the mold was molded at room temperature at a mold pressure of 40 kg / cm ² . The mold speed is 20 m / min to 120 m /
Although the speed was changed to the range of min, it was confirmed that the speed had no effect on the molding and that there was no change in the molding condition.
It was performed at 0 m / min.

[0022]

[Table 1]

(Embodiment 2) A composite foil (total thickness of 105 μm before embossing) obtained by laminating a 50 μm-thick sealant film to a 50 μm-thick aluminum foil coated on one side with 1N30 by dry lamination was roll-molded. Using a machine, a high-ridge line was inserted in the direction of flow so that the pattern of a 60-mesh lattice at room temperature and 50 kg / cm ² would have a total thickness of 165 μm after patterning. The results are shown in Table 2.

(Example 3) The same material as in Example 2 was used, but the height of the low ridge was changed, and the total thickness after molding was 165 μm.
The results are shown in Table 2.

Example 4 Low density polyethylene was melt-extruded and laminated to a thickness of 27 μm on one side of a 35 μm thick aluminum foil with a double-sided coating of 1N30 to obtain a composite foil with a total thickness of 64 μm before being molded. A molded composite foil having a total thickness of 122 μm after molding the foil under the same conditions as in Example 2 was obtained. The results are shown in Table 2.

(Embodiment 5) A composite foil (total thickness before attachment 49 with a mold) in which 1N30 aluminum foil having a thickness of 6 μm is wet laminated with paper having a basis weight of 35 g / m ^{2 on} one surface
μm) with a roll-type mold machine at a mold temperature of 80 ° C.,
Molding pressure was 60 kg / cm ² , and a 60-mesh lattice pattern with high ridge lines in the flow direction was molded. The total thickness after molding is 89 μm. The results are shown in Table 2.

(Embodiment 6) 1N30 coated on one side, a paper having a basis weight of 20 g / m ² is pasted on the other side of an aluminum foil having a thickness of 7 μm using wax, and the total thickness before embossing is 23 μm.
A composite foil of Using a roll type mold machine, the composite foil was modeled with a 200 mesh grid pattern in which a mold temperature was 60 ° C., a mold pressure was 40 kg / cm ² , and a high ridge line was inserted in the flow direction. The total thickness after imprinting is 44 μm. The results are shown in Table 2.

[0028]

[Table 2]

[0029]

Typed aluminum foil of the present invention, according to the present invention is, h ₂ /
Since curling of the aluminum foil can be prevented by setting h ₁ within the range of 0.1 to 0.6, the pattern of the pattern, the size of the pattern, and the depth can be formed as desired.

Further, since there is no curl, there is no restriction on the structure of the composite foil, the material of the foil, etc., so that a predetermined performance or quality can be ensured and a stable patterning can be performed.

Further, even if the aluminum foil is slightly curled before being molded, it is possible to obtain a curled aluminum foil which is not curled by molding.

Therefore, the aluminum foil with a mold according to the present invention has no curl, and it is possible to perform packaging and filling with good productivity without being caught in an automatic packaging or filling and sealing machine and causing troubles such as foil clogging. .

[Brief description of drawings]

FIG. 1 is an example of a pattern of a modeled aluminum foil of the present invention.

2 is a cross-sectional view of the aluminum foil of FIG. 1 taken along the line AA.

[Explanation of symbols]

1 High ridge line (vertical line) 2 Low ridge line (horizontal line) 3 Original aluminum foil surface 4 Sloping surface 5 Sloping surface h ₁ High ridge line height h ₂ Low ridge line height

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area B65D 65/40 G // B32B 15/08 F

Claims (3)

[Claims] 1. A thickness of 70 μm or less, a pattern pitch of 20 to 200 mesh, and a relationship between a height h ₁ of a high ridge line and a height h ₂ of a low ridge line is h ₂ / h ₁ = 0.1 to 0. .6
A typed aluminum foil characterized in that. 2. The pattern is rectangular (including rhombus),
The mold-type aluminum foil according to claim 1, wherein a high ridge line is formed substantially at a right angle with respect to a direction in which the aluminum foil is easily curled, or is inserted in a direction oblique to a flow direction of the foil. 3. The aluminum foil with a mold according to claim 1, which is a composite foil laminated with a coating or a film.