JP3926004B2 - Shading tube container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube container for preventing stored contents from being deteriorated by receiving light from the outside, and in particular, in addition to light shielding properties, has airtightness or moisture impermeability, and has a cylindrical body. The present invention relates to a light-shielding tube container that can be reliably sealed.
[0002]
[Prior art]
Conventionally, as a tube container having a light shielding property, there has been a tube container described in Japanese Utility Model Publication No. 57-36602. This tube container is formed by polymerizing an outer layer, an appearance color layer, a light-shielding layer, and an inner layer from the outer surface side to the inner surface side of a cylindrical body integrally connected to the neck portion.
[0003]
According to this tube container, the appearance of the tube container is adjusted by the appearance color layer that determines the color tone of the entire tube container and the outer layer for improving the printing characteristics and the like. Then, a light-shielding layer formed by adding a light-shielding pigment or additive such as metal powder to a synthetic resin such as polyethylene is superimposed on the inside of the appearance color layer, and further, the light-shielding layer is transferred to the contents inside the light-shielding layer. The inner layer is polymerized to prevent the added substances from eluting.
[0004]
In such a tube container, the light from the outside can be blocked by the light shielding layer, and the contents of the tube container can be prevented from being altered by the light.
[0005]
[Problems to be solved by the invention]
In recent years, in the field of cosmetics and the like, substances that are more susceptible to the outside world have been developed, and such delicate substances are stored in tube containers as contents. Among these substances, there are substances that require more stringent light-shielding properties during storage, and there are also substances that require airtightness and moisture permeability.
[0006]
In this case, it is conceivable to increase the light shielding property by increasing the thickness of the light shielding layer, but there is a problem that the flexibility of the tube container is lost if the light shielding layer is simply made thick in accordance with the required light shielding performance. In addition, it is conceivable to simply polymerize a protective layer having airtightness and moisture impermeability on the inside or outside of the light shielding layer, but there is also a problem that the tube container has poor flexibility. It was.
[0007]
Further, as a solution to this, it is conceivable to reduce the thickness of the tube sheet of the tube container by omitting the inner layer. However, if the light shielding layer or the protective layer described above is the innermost layer, the sealing portion is welded. In order to make sure, it is necessary to reduce the additive added to the synthetic resin, and there is a problem that the light shielding performance and the airtightness performance have to be lowered.
[0008]
Therefore, the present invention provides a tube container that can improve the light-shielding performance without impairing the flexibility of the tube container and can reliably weld the seal part in the tube container to which airtightness or moisture impermeability is added. Its purpose is to propose.
[0009]
[Means for Solving the Problems]
A tube container according to the present invention is composed of a neck portion having a spout for detachably attaching a cap, and a cylindrical body for storing contents, and one end of the cylindrical body is connected to a shoulder peripheral portion of the neck portion, In the tube container made of synthetic resin with the other end crushed and sealed, the cylindrical body has an outer layer for adjusting the appearance from the outer surface toward the inner surface, a high-concentration carbon layer having a light shielding property, and airtightness or moisture impermeability. An intermediate layer and a low-concentration carbon layer having a light-shielding property are formed, and the other end of the cylindrical body solves the above-mentioned problem by thermally welding the low-concentration carbon layer and sealing.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of a tube container according to the present embodiment, FIG. 2 is a cross-sectional view of a laminate sheet constituting a cylindrical body of the tube container, and FIG. 3 is a cross-sectional view of a seal portion of the tube container.
[0011]
The tube container of this embodiment is a tube container holding liquid or creamy cosmetics (contents). As shown in FIG. 1, the tube container A is configured by connecting a neck 1 and a cylindrical body 2. The neck 1 has a structure in which a spout 1a for taking out the contents is perforated at the center, and a screw 1b is formed on the peripheral surface so that a cap (not shown) can be detachably attached.
[0012]
The cylinder 2 is formed by forming a laminate sheet (described in detail later) formed by polymerizing a plurality of sheets into a cylindrical shape. One end 2a of the cylindrical body 2 is integrally attached so as to be fitted on the shoulder peripheral edge 1c of the neck 1 described above. In the actual manufacturing method, when the neck portion 1 is injection-molded, the cylindrical body 2 is placed in the mold and insert-molded to integrate them.
[0013]
After filling the contents from the other end 2b of the opened cylinder 2 (on the production line, the cap is attached and the neck is moved downward), the end 2b is crushed into a single character, The inner surface of the cylindrical body 2 is thermally welded by ultrasonic vibration or the like to form the seal portion 3, and the contents are enclosed.
[0014]
FIG. 2 illustrates a cross-sectional view of a laminate sheet constituting the cylinder 2. The laminate sheet S is composed of four layers of an outer layer 4, a high concentration carbon layer 5, an intermediate layer 6, and a low concentration carbon layer 7 from the outer surface toward the inner surface.
[0015]
The outer layer 4 is a synthetic resin layer such as polyethylene that can be decorated. The outer layer 4 is added with a pigment having high hiding power so that the color of the inner high-concentration carbon layer 5 is not exposed to the outside. The high-concentration carbon layer 5 is a layer obtained by adding carbon and a pigment that does not easily transmit light as additives to a synthetic resin layer such as polyethylene, and has a very high light shielding property.
[0016]
The intermediate layer 6 is a layer formed of ethylene polyvinyl resin, alcohol resin, or ionomer resin having high moisture impermeability with excellent airtightness. The low-concentration carbon layer 7 is a layer obtained by adding an additive such as carbon to a soft resin such as polyethylene in the same manner as the high-concentration carbon layer 5. The concentration of the additive is higher than that of the high-concentration polyethylene layer. It is relatively low and maintains high weldability when pressurized while applying heat.
[0017]
According to the four-layer structure of the cylindrical body 2 made of the laminate sheet S, the tube container A of the present embodiment is formed by a double light-shielding layer of the high-concentration carbon layer 5 and the low-concentration carbon layer 7. Can have sex. In particular, the intermediate layer 6 has a distance between the two layers, and the intermediate layer 6 also blocks light from being transmitted, so that a single-layer light-shielding layer having a combined thickness of the high concentration carbon layer 5 and the low concentration carbon layer 7 is used. Compared to the layer, it has higher light shielding properties. In other words, even a laminate sheet having the same light shielding performance as a whole can be made a thinner laminate sheet as compared with the case where the light shielding layer is a single layer.
[0018]
At the same time, since the intermediate layer 6 has airtightness or moisture impermeability, a tube container having additional performance in addition to light shielding properties can be obtained.
[0019]
In FIG. 3, sectional drawing of the seal part 3 of the tube container A is shown. As described above, the seal portion 3 is formed by crushing the end portion 2b of the cylindrical body 2 from both sides into one character and heat-welding the low-concentration carbon layers 7 in a pressure-bonded state. As shown in the figure, the low-concentration carbon layers 7 having a higher synthetic resin ratio than additives such as carbon are reliably welded to each other, and the tube container A is sealed.
[0020]
【The invention's effect】
As described above, in the tube container of the present invention, an intermediate layer is provided between two high-concentration carbon layers that are light-shielding and low-concentration carbon layers to provide airtightness or moisture impermeability. be able to. Since the light shielding layer has a two-layer structure and the intermediate layer also contributes to the light shielding performance, a tube container having higher light shielding properties can be obtained.
[0021]
Also, when sealing the end of the cylinder, the low-concentration carbon layer, which is the innermost layer of the two light-shielding layers as a whole, is thermally welded. It also has an effect that can be performed reliably.
[Brief description of the drawings]
FIG. 1 is a perspective view of a tube container according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a laminate sheet constituting a cylindrical body of the tube container.
FIG. 3 is a cross-sectional view of a seal portion of the tube container.
[Explanation of symbols]
A ... Tube container S ... Laminate sheet 1 ... Neck 1a ... Spout 1b ... Screw 1c ... Shoulder margin 1d ... End 2 ... Cylindrical body 2a, 2b ... End 3 ... Seal 4 ... Outer layer 5 ... High concentration carbon layer 6 ... Intermediate layer 7 ... Low concentration carbon layer

Claims (1)

Consists of a neck part having a spout for detachably attaching the cap and a cylinder body that contains the contents. One end of the cylinder body is connected so as to be fitted around the shoulder periphery of the neck part, and the other end is crushed. In the sealed synthetic resin tube container, the cylindrical body has an outer layer for adjusting the appearance from the outer surface toward the inner surface, a high-concentration carbon layer having a light-shielding property, and an intermediate layer having airtightness or moisture impermeability. A light-shielding tube container comprising: a low-concentration carbon layer having light-shielding properties, and the other end of the cylindrical body sealed by thermally welding the low-concentration carbon layer.

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