JPH0132110B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tube manufactured from a synthetic resin laminated sheet using aluminum foil, in which a desired metal can be formed by utilizing the metallic luster of the aluminum foil. This creates a metallic appearance.

[Conventional technology]

Tubes made from a synthetic resin laminated sheet with an aluminum foil layer laminated on a synthetic resin layer have high content resistance, high gas barrier properties, high mechanical strength, and are easy to manufacture when used as tube containers. It is used in large quantities in a wide range of fields because it is easy and inexpensive.

Among the above-mentioned tubes, those that have the metallic appearance of aluminum foil directly appear in the tube's appearance, exhibiting an unprecedented decorative effect.

[Problem that the invention seeks to solve]

However, the direct appearance of aluminum foil's metallic feel is not just a matter of achieving unprecedented shine, but also a variety of other decorative effects. I couldn't.

In particular, in tubes whose appearance directly resembles the metallic appearance of aluminum, the brilliance of the aluminum is too direct, lacking depth, and sometimes the brilliance seems too strong.

For this reason, in the case of tube containers used as cosmetic containers, the above-mentioned excessive shine has often been disliked due to the image of the product.

The present invention was devised in order to eliminate the drawbacks of the conventional examples described above, and it is possible to create a desired metallic feel by mixing the metallic luster of aluminum foil with other colors, and to create a desired metallic luster. The degree can be freely restricted.

[Means to solve the problem]

Therefore, on the upper surface of the inner layer 5 made of polyethylene resin, the aluminum foil layer 4 and the outer layer 3 made of polyethylene resin are laminated and bonded in order, and the sheet body 2 in the form of a band is rolled up and its both ends are overlapped. Both ends of the stacked sheet bodies 2 were heat-welded under pressure to form a tube-shaped body, and an extrusion coating layer 8 made of polyethylene resin was coated on the outer peripheral surface of the tube-shaped body.

The inner layer 5 is a portion that comes into direct contact with the contents when the tube body 1 is formed into a tube container, and is a portion that does not appear at all on the exterior of the tube body 1 due to the aluminum foil layer 4, so it is transparent and opaque. It doesn't matter at all.

The outer layer 3 is transparent or semi-transparent because it is necessary to make the metallic feel of the aluminum foil layer 4 visible from outside the tube body 1, but it is not colored at all and is colorless.

The extrusion coating layer 8 was originally provided to make the outer surface of the tube body 1 smooth.
In the case of the present invention, the outer surface of the tube body 1 is made smooth and colored in a desired color to make it transparent or translucent.

[Effect]

In the present invention, the extrusion coat layer 8 is colored in a desired color,
Moreover, since it is transparent or semi-transparent, the appearance of the tube body 1 can be seen as a mixture of the shiny metallic feel of the aluminum foil 4 and the color of the extrusion coating layer 8, and therefore, the appearance of the tube body 1 can be set by the color of the extrusion coating layer 8. This results in the appearance of a metallic feel.

Specifically, the color of the extrusion coating layer 8 is a color obtained by removing the metallic feel from the desired metal, for example, yellow to create a gold feel, or reddish brown to create a copper feel. . By doing so,
The metallic shine of the aluminum foil layer and the color of the extrusion coat layer 8 are mixed to create the above-mentioned gold or copper hue.

Furthermore, when the extrusion coat layer 8 is made transparent, the metallic feel from the aluminum foil layer 8 is visible without almost losing its luster, so a strong metallic look appears. This shine can be weakened by making it semi-transparent.
This makes it possible to create a pale metallic feel.

〔Example〕

As is clear from the figure, the joint 6 formed by welding the overlapped side ends of the sheet body 2 in the form of a belt is generally used to increase the joint strength of the joint 6 and to form a joint having low corrosion resistance. In order to protect the aluminum foil layer 4 from the contents, a joint end piece 7 made of polyethylene resin is shaped on the side edge of the sheet body 2 located inside the tube-shaped body.
When joining both ends, the resin melts together with the synthetic resin material on both ends, completely covering the inner side end surfaces, and strengthening the joint between the ends. There is.

When molding this joint 6, generally the outer peripheral surface of the joint 6 is pressed from inside to a mold having a mold surface that follows the smooth outer peripheral surface of the tube-shaped body to be molded, and then heated and welded. An operation is performed.

This is because, unlike the other parts of the tube-like body, this joint part 6 has a thickness that is double the thickness of the sheet body 2, so the outer peripheral surface of the tube-like body expands by this extra thickness. This is to prevent the inconvenience of the outer peripheral surface of the tube-like body losing its smoothness due to the tube-shaped body being exposed.

However, in the case of the present invention, since the extrusion coating layer 8 is further coated and molded on the outer peripheral surface of this tube-shaped body, there are some changes in conditions in the welding operation of the joint part 6. Even if some unevenness is formed on the surface, the outer circumferential surface of the tube body 1 can be made completely smooth by the extrusion coating layer 8.

〔Effect of the invention〕

As described above, the tube body 1 according to the present invention can exhibit various desired metallic textures by mixing the extrusion coating layer with the metallic texture of the aluminum foil layer 4. Furthermore, the metallic feel that appears is not just a strong shine as in the past, but can be made to have a desired degree of pale depth.

Furthermore, since the extrusion coating layer 8 is formed to coat the outer peripheral surface of the molded tube-like body, the outer peripheral surface of the tube-like body can be made a smooth surface, and furthermore, molding is easy and color setting is easy. It exhibits excellent effects, such as being flexible and changeable.

[Brief explanation of drawings]

The drawing is an enlarged sectional view of a main part showing an embodiment of the present invention. Explanation of symbols, 1: tube body, 2: sheet body,
3: outer layer, 4: aluminum foil layer, 5: inner layer, 6: joint part, 7: joint end piece, 8: extrusion coat layer.

Claims (1)

[Claims] 1. Roll up the band-shaped sheet body 2, overlap both side ends, weld and join the both side ends of the overlapping sheet body 2 by applying pressure and heating, and apply a weld to the outer peripheral surface of the tube-like body formed by this joining. It is a synthetic resin tube coated with a transparent or translucent polyethylene resin extrusion coat layer 8 colored in a desired color, and the sheet body 2 is coated with a polyethylene resin inner layer 5 and an upper surface of the inner layer 5. A synthetic resin tube consisting of an aluminum foil layer 4 laminated and bonded to the aluminum foil layer 4, and a transparent outer layer 3 made of polyethylene resin laminated and bonded to the upper surface of the aluminum foil layer 4.