JPH1120840A - Double-tube container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a seal part simply, safely and favorably by a usual welding work while preventing a large variation of thickness in the seal part to be formed, in a double-tube container formed of a plurality of internal tubes combined adjacently and parallely in an external tube body. SOLUTION: The lower end 4 of a plurality of internal tube bodies 2 parallelly inserted in an external tube body 7 is contracted as it goes to the opening end and the width of the seal part 5 of the internal tube squashed flat is made smaller than the width of the body 3 of internal tube 2. In this way, the seal parts of adjacent internal tubes 2 are prevented from overlapping with each other. The seal part is constituted of superposed parts where the external tube and one of the internal tubes are mutually superposed and single parts constituted of only external tubes and the difference of thickness of the seal parts can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single tube container in which a plurality of inner tube bodies are inserted and assembled into an outer tube body, and a plurality of separated and stored contents are joined together by a single pressing operation. Or a double tube container made of synthetic resin which is continuously extruded by a pressing operation in order.

[0002]

2. Description of the Related Art A plurality of inner tube bodies are inserted and assembled side by side in an outer tube body, and the lower end openings of the outer tube body and the plurality of inner tube bodies are aligned in the parallel arrangement direction of the inner tube bodies. 2. Description of the Related Art A double-tube container made of a synthetic resin is known which is flatly crushed and welded and sealed together from the front and rear directions perpendicular to each other.

In this double tube container, in most cases, the outer tube functions as an outer shell for integrally assembling and holding a plurality of inner tubes, and the contents are stored in each inner tube. It has become something.

As described above, since the outer tube simply functions as a mere outer shell, a wasteful space formed between the outer tube and the inner tube is reduced as much as possible, and the efficiency is improved. As shown in FIG. 10, in order to achieve assembling of the inner tube body with respect to the outer tube body and to minimize the total volume of the double tube container containing a certain amount of contents, as shown in FIG. The seal portion 1 has a structure in which a part of an inner tube seal portion 5 which is a seal portion of an adjacent inner tube body 2 is overlapped.

That is, as shown in FIG. 11, a plurality (two in the illustrated embodiment) of inner tube bodies 2 having a cylindrical body 3 of equal diameter, and a body part 3 in an outer tube body 7 are provided. In the state of being inserted and assembled adjacently and in parallel, the lower end 4 of the body 3 of the inner tube body 2 is put together with the lower end of the body of the outer tube body 7,
When the inner tube body 2 is squashed flatly from a direction orthogonal to the parallel arrangement direction, the crushing causes portions of the lower end portion 4 which is inevitably wider than the body portion 3 to overlap, thereby forming The sealed portion 1 is a polymerized portion 1a where the outer tube 7 and one inner tube 2 are polymerized.
And a single portion 1b composed only of the outer tube body 7, and a multi-polymerized portion 1c in which the outer tube body 7 and the two inner tube bodies 2 are polymerized.

In the prior art, the outer tube is formed by overlapping a part of the inner tube seal portion 5 of the adjacent inner tube body 2 to form a multi-polymer portion 1c to form the seal portion 1 of the double tube container. The plurality of inner tube bodies 2 can be housed adjacent to each other in the body 7, thereby achieving efficient storage and assembly of the plurality of inner tube bodies 2 with respect to the outer tube body 7.

[0007]

However, according to the above-mentioned prior art, as shown in FIG. 10, the sealing portion 1 of the molded double tube container has a superposed portion 1a, a single portion 1b and Since it is composed of the multi-overlap portion 1c, the flattened and crushed lower end opening which is formed by welding and sealing the seal portion 1 has a large thickness between the single portion 1b and the multi-overlap portion 1c. A difference (two thicknesses of the thickness of the body 3 of the inner tube body 2 crushed flat) occurs, and due to this large difference in thickness, the entire area of the seal portion 1 is formed with uniform welding strength. There was a problem that it became difficult.

Further, in order to perform a welding sealing treatment of the sealing portion 1 by increasing the heating temperature and crushing force in order to firmly seal the entire area of the sealing portion 1 with a uniform welding strength,
There is a large difference in the amount of the molten fluid resin between the single part 1b and the multi-polymer part 1c. Therefore, the molded seal part 1 may have a defective molded part such as a burr or the molded seal part 1 There were problems such as the formation of a step which deteriorates the appearance at the boundary with the tube container body, and the possibility of melt fracture occurring at the tube container body where the multi-polymerized portion 1c is located.

Accordingly, the present invention has been made to solve the above-mentioned problems in the prior art. In a double tube container in which a plurality of inner tube bodies are assembled adjacently in parallel in an outer tube body, A technical problem is to prevent a large change in wall thickness from occurring at a flattened lower end opening of a combination of an outer tube body and a plurality of inner tube bodies welded and formed on a seal portion. An object of the present invention is to easily, safely and satisfactorily mold a seal portion of a heavy tube container by a usual welding sealing operation.

[0010]

Means for Solving the Problems Among the present invention for solving the above technical problems, the means according to the first aspect of the present invention is to assemble a plurality of inner tube bodies adjacently and in parallel in an outer tube body,
Double tube container made of synthetic resin for flattening the lower end openings of the body of the outer tube body and the plurality of inner tube bodies together from the front and rear direction orthogonal to the parallel arrangement direction of the plurality of inner tube bodies and welding and sealing them. The diameter of the lower end of the body of the inner tube body, as approaching the open end, is reduced to the extent that the filling of the contents into the inner tube from the lower end open end can be smoothly achieved. By reducing the diameter, the width of the inner tube seal portion of the inner tube is made smaller than the width of the body of the inner tube.

According to a second aspect of the present invention, the means for forming the inner tube body according to the first aspect of the present invention is formed by connecting an approximately spherical shell-shaped bottom to the lower end of a cylindrical body having the same diameter. The inner tube body is blow-molded, and the bottom of the inner tube body is cut and removed along a preset cut line, leaving a lower end portion, which is a portion connected to the body, to remove the inner tube body. It is made up of:

According to a third aspect of the present invention, the means for forming the inner tube body according to the first aspect of the present invention comprises an inner tube body having an equal-diameter cylindrical body. The lower end portion of the portion is heat-shrinkable and deformed by heat treatment to form a lower end portion, thereby forming an inner tube body.

[0013] Since the width of the inner tube seal portion which is crushed flat and formed is set to be smaller than the width of the body portion of the same inner tube body, the width of the inner tube seal portion is adjacent to the inner tube body. The lower end openings of the body portions of the plurality of inner tube bodies arranged in parallel, together with the lower end opening portions of the body portion of the outer tube body, are squashed flatly from the front-rear direction orthogonal to the parallel arrangement direction. The edge is always located within the extension of the outer surface of the body of the inner tube body.

Further, the plurality of inner tube bodies are assembled in the outer tube body in a state where the body is adjacent to the body, that is, in a state where it cannot be further approached.

Therefore, when the lower end openings of the outer tube body and the plurality of inner tube bodies are flattened together,
The lower end openings of the flattened body portions of the adjacent inner tube bodies do not overlap at all, and the formed seal portion has a polymerized portion in which the outer tube body and one inner tube body are superimposed on each other. It consists of a single part consisting only of a tube body.

As described above, the seal portion formed by welding is:
Since it is composed of a polymerized part and a single part, the thickness difference between the parts before the welding molding is minimized, so that a strong, good-looking seal part is easily and well molded. Will be.

Normally, the filling and filling of the contents into the inner tube body is carried out from the lower end opening of the body before the formation of the seal portion. The diameter is set to such a degree that the filling and filling of the contents from the open end of the reduced-diameter lower end can be smoothly achieved.Therefore, by reducing the diameter of the lower end, the content of the contents into the inner tube body is reduced. There is no hindrance to filling.

According to the second aspect of the present invention, since the inner tube body is formed by cutting and removing the bottom of the inner tube body which is a blow molded product, the lower end portion whose diameter is reduced as approaching the open end is precisely adjusted. Good and stable molding can be achieved.

According to the third aspect of the present invention, the lower end portion of the body is reduced in diameter by utilizing the heat shrinkage characteristic of the body of the inner tube body made of synthetic resin. Therefore, molding of the inner tube body and diameter-reducing molding of the lower end portion are simplified.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIGS. 1 to 5 show a first embodiment. As shown in FIG. 2, a lower end of an equal-diameter cylindrical body 3 integrally connected to a head having a mouth portion (see FIG. 2). On the upper end), an inner tube body 2 'in which a substantially spherical shell-shaped bottom 6 is continuously formed in a bulging shape is blow-molded, and the bottom 6 of the inner tube body 2' is The inner tube body 2 is formed by cutting and removing along the cut line K set beforehand, leaving the lower end portion 4 which is a portion connected to the portion 3.

The bottom 6 of the inner tube body 2 'is for molding the lower end 4 of the inner tube body 2 together with the body 3 using blow molding means. The shape of the lower end portion 4 may be adapted to the reduced diameter shape. In the case of the embodiment shown in FIG. 2, since the body portion 3 is a flat long cylindrical shape, it has a substantially elliptical arc shape.

As shown in FIG. 4, a plurality of the inner tube bodies 2 formed as described above are inserted and assembled in parallel in the outer tube body 7 with the body 3 adjacent thereto. The lower end 4 of the body 3 of the inner tube body 2 together with the lower end of the body 7 of the inner tube body 2 are flattened and crushed from a direction orthogonal to the parallel arrangement direction of the inner tube bodies 2 to be welded and sealed.

In the present invention, the width of the inner tube seal portion 5 formed by being squashed flat is set to be smaller than the width of the body 3 of the same inner tube body 2. The lower end openings of the body portions 3 of the plurality of inner tube bodies 2 arranged adjacently and side by side in the outer tube body 7 together with the lower end openings of the body portions of the outer tube body 7 are perpendicular to the parallel arrangement direction. In a state where the inner tube body 2 is squashed flatly from the direction, both side edges are always located within the extension surface of the outer surface of the body 3 of the inner tube body 2.

Accordingly, when the lower end openings of the outer tube body 7 and the plurality of inner tube bodies 2 are flattened together, the lower end of the flattened body part 3 of the adjacent inner tube body 2 is flattened. The openings 1 are not overlapped at all, and the molded seal portion 1 is composed of a polymerized portion 1a in which the outer tube 7 and one inner tube 2 are superimposed, and a single portion 1b composed of only the outer tube 7. , And the conventional polymerized portion 1c is never formed (see FIGS. 1, 5, and 10).

FIGS. 6 to 9 show a second embodiment. As shown in FIG. 7, an inner tube element having an equal-diameter cylindrical body 3 whose lower end (the upper end in FIG. 7) is open. Body 2 '
Is formed, and the lower end portion of the body portion 3 of the inner tube body 2 ′ is heat-shrinked and deformed by heat treatment with the heater H to form the lower end portion 4, thereby forming the inner tube body 2.

In the second embodiment, the inner tube body 2 'is formed into the inner tube body 2 by simple heat-shrinkage deformation. At this time, unnecessary parts are not generated, so that the inner tube body 2' is consumed. There is no waste in the synthetic resin material, and it is very economical.

As shown in FIG. 8, a plurality of the inner tube bodies 2 are inserted in parallel in the outer tube body 7 with the body parts 3 adjacent to each other, and the lower end of the body part of the outer tube body 7 is assembled. The lower end 4 of the body 3 of the inner tube body 2 together with the portion is flatly crushed from a direction orthogonal to the direction in which the inner tube bodies 2 are arranged in parallel, and welded and sealed.

Also in this case, the width of the inner tube seal portion 5 formed by being squashed flat is set to be smaller than the width of the body 3 of the same inner tube body 2. As shown in FIG. 6, FIG.
When the body lower end openings of the plurality of inner tube bodies 2 are crushed flat together, the flattened body 3 lower end openings of adjacent inner tube bodies 2 do not overlap at all. The molded seal portion 1 is composed of a polymerized portion 1a in which the outer tube body 7 and one inner tube body 2 are polymerized, and a single portion 1b composed of only the outer tube body 7.

[0029]

Since the present invention has the above-described structure, the following effects can be obtained. Since the width of the inner tube seal portion formed by being squashed flat is set in advance so as to be smaller than the width of the body portion of the same inner tube body, the outer tube body and the plurality of inner tube bodies are set. When the body lower end openings are crushed flat together, the flattened body lower end openings of the adjacent inner tube bodies do not overlap at all, and the molded seal portion is Since it is composed of a polymerized portion in which the tube body and one inner tube body are polymerized, and a single portion composed only of the outer tube body, a difference in wall thickness of the seal portion can be minimized.

Therefore, by the usual welding sealing process, the entire sealing area can be easily and reliably formed with a substantially uniform welding strength and good appearance.

Further, since the plurality of inner tube bodies can be inserted and assembled into the outer tube body without separating them, the outer tube body can effectively function as a storage space for the inner tube body. As a result, high storage efficiency of contents can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing a first embodiment of the present invention.

FIG. 2 is an overall perspective view showing an inner tube body in the embodiment shown in FIG.

FIG. 3 is a front view showing a forming process of the inner tube body shown in FIG. 2 into an inner tube body.

FIG. 4 is an essential part perspective view showing a molding mode of the embodiment shown in FIG. 1;

FIG. 5 is a main part front view showing another aspect of the first embodiment.

FIG. 6 is a main part front view showing a second embodiment of the present invention.

FIG. 7 is a perspective view showing a forming process of the inner tube body into the inner tube body in the embodiment shown in FIG. 6;

FIG. 8 is a perspective view of a main part showing a molding mode of the embodiment shown in FIG. 6;

FIG. 9 is a front view of a main part showing another aspect of the second embodiment.

FIG. 10 is a main part front view showing a conventional example of a seal portion of a double tube container.

FIG. 11 is a perspective view of a main part showing a molding mode of the conventional example shown in FIG. 10;

[Explanation of symbols]

 1; seal portion 1a; polymerized portion 1b; single portion 1c; polypolymerized portion 2; inner tube body 2 '; inner tube body 3; trunk portion 4; lower end portion 5; inner tube seal portion 6; bottom portion 7; Body K; Cut line H; Heater

Claims (3)

[Claims] 1. A plurality of inner tube bodies (2) are assembled adjacently in parallel in an outer tube body (7), and said outer tube body (7) is assembled.
And a plurality of inner tube bodies (2) are flattened and welded and sealed together by flattening the lower end openings of the plurality of inner tube bodies (2) from the front-rear direction orthogonal to the parallel arrangement direction of the plurality of inner tube bodies (2). When the lower end (4) of the body (3) of the inner tube body (2) approaches the open end, the contents are injected into the inner tube body (2) from the open end. The width of the inner tube seal portion (5) of the inner tube body (2) is reduced by reducing the diameter of the inner tube body (2) so that the filling can be achieved smoothly.
A double-tube container made of synthetic resin having a width smaller than the width of the trunk (3) of (2). 2. A substantially spherical arc-shaped bottom portion (6) is bulged at the lower end of an equal-diameter cylindrical body (3) to blow and form an inner tube body (2 '). The bottom (6) of the tube body (2 ') is cut and removed along a preset cut line (K), leaving a lower end (4), which is a portion connected to the body (3). 2. The synthetic resin double tube container according to claim 1, wherein the inner tube body (2) is formed. 3. An inner tube body (2 ') having an equal diameter cylindrical body (3), wherein a lower end portion of the body (3) of the inner tube body (2') is heated. Heat shrink deformation by processing to lower end
(1) The inner tube (2) is formed by molding into (4).
The double-tube container made of the synthetic resin described in the above.