JP2002128106A - Double tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To less easily disconnect a neck part 4 of an outer tube B from a neck part 1 of an inner tube A without impairing the productivity in a double tube having a double structure comprising the inner tube A and the outer tube B, and capable of simultaneously squeezing out each content in both tubes. SOLUTION: This double tube comprises a body having an outer tube discharge hole 9 and an inner cylinder 12 having an internal space forming an inner tube discharge hole 11. In the inner cylinder 12, the outer tube discharge hole 9 is communicated with the outer tube B by fitting an intermediate plug C supported by a center part of the outer tube discharge hole 9 via a rib 13 provided between the inner cylinder 12 and the body 10 with a space in the circumferential direction of the inner cylinder 12 to a neck part 4 of the outer tube B. The inner tube discharge hole 11 is communicated with the inner tube A by fitting the neck part 1 of the inner tube A to an inner end of the inner cylinder 12 extended inwardly from the rib 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double tube in which two types of contents which are difficult to mix because of their chemical reactivity are stored separately and both contents are simultaneously extruded at the time of use. More specifically, the present invention relates to a double tube which is constituted by an inner tube and an outer tube, and in which contents stored in each tube are simultaneously extruded.

[0002]

2. Description of the Related Art Conventionally, a double tube, which is constituted by an inner tube and an outer tube, and the contents stored in each tube are simultaneously extruded, is provided at the neck portion of the inner tube at intervals in a circumferential direction. In addition to fitting the tubular adapter provided with the part, the neck of the inner tube fitted with this tubular adapter is fitted from the inside of the outer tube into the neck of the outer tube, and the contents in the outer tube and the inner tube Is extruded from the space between the projecting portions around the cylindrical adapter and the hole of the cylindrical adapter, respectively (Japanese Patent Application Laid-Open No. 11-5021).
No. 79).

[0003]

However, in the case of the above-mentioned conventional double tube, the tubular adapter is fitted and located just inside the mouth portion of the outer tube, so that, for example, it is jammed in the mouth portion of the outer tube. When scraping the contents with a thin stick, the tubular adapter may be pushed into the outer tube. If the tubular adapter comes off the inside of the neck of the outer tube and is pushed into the outer tube, the two kinds of contents are mixed in the outer tube, which hinders subsequent use.

[0004] The above problem can be solved by bonding the neck of the outer tube, the tubular adapter, and the neck of the inner tube with an adhesive, respectively, but such a production process is complicated. And there is a problem that productivity is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional double tube, and has an object to make it difficult for the neck portion of the outer tube to be disconnected from the neck portion of the inner tube without impairing productivity. And

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a double tube having a double structure comprising an inner tube and an outer tube, wherein the contents stored therein are simultaneously extruded. A main body having a tube discharge hole, and an inner tube having an inner space formed as an inner tube discharge hole whose inner space is oriented in the same direction as the outer tube discharge hole, and the inner tube is provided at the center of the outer tube discharge hole. An inner plug supported via a rib provided between the inner cylinder and the main body at intervals in the circumferential direction is attached to the neck of the outer tube, and the outer tube discharge hole is communicated with the outer tube. On the other hand, a neck portion of the inner tube is fitted to an inner end of the inner tube extending inward from the rib, and an inner tube discharge hole is communicated with the inner tube. Also provide tubes It is.

According to the present invention, the outer end of the inner tube is recessed inward from the outer opening end of the outer tube discharge hole, and the inner wall surface of the outer opening end of the outer tube discharge hole faces outward. The tapered outer tube has a tapered shape that gradually narrows the diameter of the outer tube discharge hole.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the present invention will be described with reference to FIGS.

A shown in FIGS. 1 and 2 is an inner tube in which a cylindrical body 3 is joined to a shoulder 2 connected to a neck 1.
B shown in FIG. 3 is an outer tube in which a cylindrical body 6 is joined to a shoulder 5 connected to the neck 4. As shown in FIG. 1, the inner tube A is placed inside the outer tube B, and contains different contents. Although not shown, the trunk 3 of the inner tube A before the butt seal is not shown.
Is located slightly inside the end of the body 6 of the outer tube B, and is sealed together with the end of the body 6 of the outer tube B by a method such as a high-frequency seal, an ultrasonic seal, or a heat seal. .

The body portions 3, 6 of the inner tube A and the outer tube B
Is preferably made of a laminate material with an aluminum foil interposed in order to suppress the suction of air due to elastic return after crushing. In addition, in order to easily crush the inner tube A and the outer tube B evenly, the body portion 3 of the inner tube A is particularly made of a laminate material in which an external pressure is easily transmitted among laminate materials in which an aluminum foil is interposed. Is preferred. As a laminate material to which the external pressure is easily transmitted, a material based on high-density polyethylene can be used. As a specific example, high-density polyethylene (HDPE) / ethylene-
Methacrylic acid copolymer (EMAA) / Aluminum foil (Al)
/ Ethylene-methacrylic acid copolymer (EMAA) / low density polyethylene (LDPE). As described above, while suppressing the suction of air, the inner tube A and the outer tube B are easily crushed evenly, so that the content of the inner tube A and the content of the outer tube B are extruded. It is easier to maintain a constant.

As shown in FIGS. 1 and 2, the inner wall surface of the distal end of the neck portion 1 of the inner tube A is protruded inward, and forms a locking projection 7. 1 and 3
As shown in FIG. 1, a locking projection 8 protruding outward is formed on the outer wall surface of the neck 4 of the outer tube B in the circumferential direction. The role of the locking projections 7, 8 will be described later.

C shown in FIGS. 1 and 4 is an inner plug, which is attached to the neck portion 4 of the outer tube B from outside. The inner plug C has a main body 10 having an outer tube discharge hole 9 and an inner tube 12 having an inner space formed as an inner tube discharge hole 11 whose inner space faces in the same direction as the outer tube discharge port 9.

The inner cylinder 12 is located at the center of the outer tube discharge hole 9 of the main body 10 and has ribs 13 provided between the inner cylinder 12 and the main body 10 at intervals in the circumferential direction of the inner cylinder 12. Supported through. That is, the outside and the inside of the outer tube discharge hole 9 bordered by the rib 13 are continuous with each other via the space opened between the ribs 13.

The inner end of the inner tube 12 extends inward from the position supported by the rib 13. The neck 1 of the inner tube A is fitted to the inner end of the inner tube 12, and Are communicated with the inner tube discharge hole 11.
Therefore, as the outer tube B is crushed, the inner tube A
Is pressed, the contents in the inner tube A are
Are extruded through the inner tube discharge hole 11.

A locking recess 14 is formed in the outer peripheral surface of the inner end of the inner tube 12 in the circumferential direction. When the neck 1 of the inner tube A is fitted, the locking protrusion 14 of the inner tube A is used. The engagement between the portion 7 and the locking concave portion 14 makes it difficult for the neck portion 1 of the inner tube A to come off the inner tube 12. The inner tube 12 and the neck portion 1 of the inner tube A may be simply fitted tightly, but it is easy to assemble, and the inner tube A is removed from the inner tube 12 by an impact when the double tube is dropped. In order to prevent the neck 1 from coming off, it is preferable to adopt a fitting type in which the engagement by the locking projection 7 and the locking recess 14 is used together.

The outer end of the inner cylinder 12 (the inner tube discharge hole 1
It is preferable that the outer open end of the outer tube 1 is retracted inward from the outer open end of the outer tube discharge hole 9. In this way, the content pushed out from the inner tube A merges with the content pushed out from the outer tube B in the outer tube discharge hole 9 and is pushed out of the inner plug C. The contents pushed out from the tube A can be taken out while being wrapped with the contents pushed out from the outer tube B.

The outer tube discharge hole 9 provided in the main body 10 of the inner plug C communicates with the inside of the outer tube B by attaching the inner plug C to the neck 4 of the outer tube B. Therefore, when the outer tube B is pressed, the contents in the outer tube B are
It is pushed out through the outer tube discharge hole 9.

The main body 10 of the inner plug C is placed over the neck 4 of the outer tube B, and the inner wall surface of the main body 10 is formed with a locking recess 15 in the circumferential direction. When the inner plug C is fitted to the inner tube 4, the locking projection 8 of the outer tube B and the locking recess 15 are engaged with each other, so that the inner plug C is less likely to come off the neck 4 of the outer tube B. It has become. The inner plug C can be attached to the neck portion 4 of the outer tube B by tight fitting or screwing. However, in order to make it easier to assemble and to make the inner plug C hard to come off, the locking projection is used. Part 8 and locking recess 1
It is preferable to use a fitting type in which the engagement of No. 5 is also used.

As shown in FIG. 1, an inverted tapered ring 16 is provided at the top of the inner plug C. This reverse taper ring 16 constitutes a part of the outer tube discharge hole 9,
The inner wall surface is provided with a reverse taper that gradually narrows the opening diameter toward the outside. That is, the inner wall surface of the outer opening end of the outer tube discharge hole 9 is
Accordingly, an inverse taper that gradually narrows the diameter of the outer tube discharge hole 9 toward the outside is provided. This reverse taper is not essential, but if it is attached, the contents pushed out from the inner tube discharge hole 11 can be more securely wrapped around the contents pushed out from the outer tube discharge hole 9. It is preferred.

On the peripheral side surface of the main body 10 of the inner plug C, a male screw portion 17 is provided. The female thread 18 provided on the inner wall surface of the cap D is screwed to the male thread 17 and attached. On the inner surface of the top of the cap D, a sealing annular projection 19 that fits on the inner diameter side of the inverted tapered ring 16 protrudes, so that the sealing force of the cap D can be increased.

This double tube is composed of inner and outer tubes A and B
In the state where the ends of the body portions 3 and 6 are open, the inner plug C is attached to the neck portion 4 of the outer tube B, and the inner tube A is inserted from the end side of the opened outer tube B, and the inner tube A The neck 1 is fitted into the inner cylinder 12 of the inner plug C, and the contents are injected from the ends of the inner tube A and the outer tube B, respectively. The contents can be packaged separately.

The double tube is suitable for packaging, for example, a two-material type toothpaste, hair coloring, adhesive and the like.

[0023]

The present invention is as described above. Since the connection between the neck portion 1 of the inner tube A and the neck portion 4 of the outer tube B is mainly performed by fitting, the assembling work is easy and the production is easy. Excellent in nature. The neck 1 of the inner tube A is fitted to the inner tube 12 of the inner plug 10 attached to the neck 4 of the outer tube B, and this fitting position connects the inner tube 12 to the main body 10. Since it is inside the rib 13, even if a thin rod or the like is inserted from the open end of the outer tube discharge hole 9, the neck 1 of the inner tube A
It is difficult to reach the inner tube A, and it is easy to prevent the neck portion 1 of the inner tube A from being pushed out of the inner tube 12 and being pushed in.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a double tube of the present invention.

FIG. 2 is a cross-sectional view of the inner tube in FIG.

FIG. 3 is a cross-sectional view of the outer tube in FIG.

FIG. 4 is a plan view and a sectional view of the inner plug in FIG. 1;

[Explanation of symbols]

 A Inner tube B Outer tube C Inner plug D Cap 1 Neck 2 Shoulder 3 Trunk 4 Neck 5 Shoulder 6 Trunk 7 Locking projection 8 Locking projection 9 Outer tube discharge hole 10 Main body 11 Inner tube discharge Hole 12 Inner cylinder 13 Rib 14 Locking recess 15 Locking recess 16 Reverse taper ring 17 Male thread 18 Female thread 19 Annular projection for sealing

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shigetori Kono 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Joint printing company (72) Inventor Hajime Yagi 4- 14-12 Koishikawa, Bunkyo-ku, Tokyo Joint Inside Printing Co., Ltd. (72) Inventor Yoshinori Kimura 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Joint Printing Corporation (72) Inventor Fumie Sakai 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Joint Printing Incorporated (72) Inventor Akira Ogawara 2-3-18, Kami-Ogi, Suginami-ku, Tokyo (72) Inventor Mitsuo Ishijima 1-6-16-Asagaya-minami, Suginami-ku, Tokyo F-term (reference) 3E065 AA06 BA02 BA15 BB03 CA20 DA04 DA08 DB05 DD05 FA06 GA01 GA03 GA10

Claims (3)

[Claims] 1. A double tube comprising an inner tube and an outer tube, wherein the contents contained therein are simultaneously extruded, wherein a main body having an outer tube discharge hole, and an inner space having an outer tube discharge hole. An inner tube having an inner tube discharge hole oriented in the same direction, and the inner tube is provided between the inner tube and the main body at a central portion of the outer tube discharge hole at intervals in a circumferential direction of the inner tube. The inner plug supported through the rib is attached to the neck of the outer tube, and the outer tube discharge hole communicates with the outer tube, while the inner tube extends inward from the rib. A double tube wherein the neck of the inner tube is fitted to the end, and the inner tube discharge hole is communicated with the inner tube. 2. The double tube according to claim 1, wherein the outer end of the inner tube is recessed inward from the outer opening end of the outer tube discharge hole. 3. An inner wall surface of an outer opening end of the outer tube discharge hole is provided with an inverse taper which gradually narrows the diameter of the outer tube discharge hole toward the outside.
A double tube according to claim 1.