Multi-tube container having breakable connections at both ends thereof

This invention relates to a multi-tube container having multiple tubes in parallel. The container includes a plurality of body portions, each of which having a hollow portion for containing contents, a plurality of twistable head portions formed at one end of each of the body portions, a plurality of neck portions, each of which can be broken off by twisting of the head portion, creating an opening for extruding the contents from the hollow portion and is located between the body portion and the head portion, and a plurality of sealing portions formed at the other end of each of said body portions. Each of the sealing portions are breakably connected to the adjacent sealing portions, and at least one of the head portions and the neck portions are breakably connected to each other.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to a multi-tube container in which multiple 
squeezable tubes made of a plastic material are arranged in parallel and 
made separable from one another and to a manufacturing method for the 
multi-tube container. 
2. Description of Related Art 
Items that are free from harmful substances, such as corrosion inhibitors, 
contained in containers fir foods, cosmetics, and etc. are getting popular 
these days, and consumers are more oriented toward natural tastes or 
natural features. Therefore, there are demands for subdivided containers 
with contents which can be used up in one time or in a couple of times 
after the containers have been opened. 
Some technologies, such as disclosed in Japanese Utility Model Unexamined 
Publication No. 61-30,622 and Japanese Utility Model Publication No. 
63-594, have been developed so far in order to accomplish the object 
above. The former technology relates to a multi-container type package in 
which plural containers with respective caps are arranged in parallel and 
in which adjacent containers are detachably connected with each other at 
their caps and bodies by means of connecting pieces. The latter technology 
relates to a multi-tube container in which multiple squeezable tubes with 
respective caps are arranged in parallel and in which respective 
connection strings connect one tube with the adjacent tube at their caps 
and bodies. 
The former multi-container type package, however, raises a problem that it 
cannot be molded easily because it requires to provide connecting pieces 
at respective caps and bodies, and to connect those connecting pieces 
breakably. The package further raises a problem that for respective 
containers are connected simply at the caps and bodies the package may not 
stably maintain its connection because the lower portions, or the bottoms, 
to which weights of the filled contents are exerted, of the container are 
not connected. The latter multi-tube container requires to connect the 
containers with each other by attaching thick connecting strings between 
the caps and between the bodies, so that the container cannot be molded 
easily. The container also raises a problem that the connecting strings 
cannot be cut easily when the respective containers are to be separated. 
As well as the above, the container further raises a problem that the 
container may not stably maintain its connection because the bottoms, to 
which weights of the filled contents are exerted, of the container are not 
connected. 
SUMMARY OF THE INVENTION 
It is an object of the invention to provide a novel container to 
accommodate with the needs described above, such as its portability, 
capacity of filling contents, productivity of heat sealing at the bottom, 
stability of connection among multiple tubes arranged in parallel, are 
well designed, and to provide its manufacturing method. 
According to the invention, a multi-tube container arranged in parallel 
multiple tubes, in each of which a neck portion can be separated by 
twisting a head portion to create an opening for extruding contents 
thereof, includes head portions and neck portions, either or both of which 
are breakably connected with each other at one end of the tubes, and 
sealing portions formed at the other end of the tubes and breakably 
connected with each other. 
The multiple tubes arranged in parallel are connected with each other at 
either or both of the head portions and neck portions and further at the 
sealing portions located at the bottoms of the tubes, so that the entire 
tubes can be handled easily as a single container. The sealing portions, 
to which weights of the contents are exerted, are connected with each 
other, so that the multiple connected tubes can be unitedly constituted 
under a condition stable as a whole. A content in each tube can be used up 
after detaching piece by piece. 
A manufacturing method for the multi-tube container according to the 
invention includes the steps of: arranging in parallel, plural thin 
sleeves for forming body portions of multiple tubes in a cavity of a mold 
for injection molding; injecting a plastic material into said cavity from 
one end of said sleeves so as to form on the one end side a heat portion, 
a neck portion, and a shoulder portion of each tube so that either or both 
of said head portions and said neck portions are breakably connected; 
filling contents in the sleeves from the other end of said sleeves; and 
melting the other end of said tubes so as to form sealing portions for 
sealing said tubes and so as to breakably connect said one tube with said 
other adjacent tube or tubes at said sealing portion. 
With the manufacturing method for the multi-tube container according to 
invention, either one or both of the head portions and the neck portions 
can be breakably connected with each other when those head and neck 
portions are formed by injection molding, because plural thin sleeves for 
forming body portions of multiple tubes are arranged in parallel in the 
cavity of a mold for injection molding and because the plastic material is 
injected into said cavity from one end of said sleeves so as to form on 
the one end side a heat portion, a neck portion, and a shoulder portion of 
each tube. Moreover, with the manufacturing method according to the 
invention, since the sealing portion at the bottom of the tube is 
connected to another adjacent sealing portion or other sealing portions, 
the sealing portions can be connected with each other at the same time 
when the sealing portions are formed by pressing with heat in order to 
seal the open end of the sleeves after the contents are filled in the 
sleeves.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Referring to the drawings in detail, a multi-tube container and its 
manufacturing method according to a preferred embodiment of the invention 
are shown. 
In FIG. 1, the reference numeral 1 represents a multi-tube container 1 
according to this invention, in which plural squeezable tubes 2 are 
arranged in a row from one side to the other side. The reference numeral 3 
indicates a body portion of the tube 2 and is made of a thin plastic 
material sleeve or cylinder with thickness of 0.3 mm. A shoulder portion 
4, a neck portion 5 whose top is made gradually narrower so as to form a 
fine opening, and ahead portion 6 flatly and widely projected to the left 
and right are formed subsequently on the top of the body portion 3. Each 
head portion 6 is connected to adjacent head portion or portions 6, and a 
vertical groove 7 for partition is formed between the head portions 6. The 
reference numeral 8 indicates a heat sealing portion at a bottom of the 
tube 2. Each heat sealing portion 8 is connected to adjacent heat sealing 
portion or portions 8 via a thin portion or thin portions to be broken. 
Referring to FIGS. 2, 3, a manufacturing method of the multi-tube container 
1 shown in FIG. 1 is described below. In the manufacturing method of the 
multi-tube container 1 according to the invention, plural body portions 3 
made of the thin plastic material sleeves or cylinders with thickness of 
0.3 mm, are inserted and arranged in parallel in a cavity of a mold 9 for 
injection molding. Plastic material is then injected, while the sleeves 
are set as they are, into the cavity through sprue runners 10 and sprues 
11, so that the shoulder portions 4, the neck portions 5 made narrower on 
theirs upper end so as to constitute fine openings, and the head portions 
6 flatly and widely projecting to the left and right are respectively 
formed. 
When forming the head portions 6, molten resin introduced in one 
compartment of the cavity joins in other molten resin introduced in the 
adjacent compartment or compartments, because each compartment for forming 
the head portion 6 has the single sprue 11 for injection molding at the 
center of the compartment, thereby connecting the head portions 6 in an 
unstable condition, so that the vertical grooves 7 are automatically 
formed at the junction portion. The portion at which the vertical groove 7 
is formed is made of a junction in such an incomplete state as described 
above, so that it can be easily broken, thereby easily detaching one head 
portion 6 from the adjacent head portions 6. 
After the contents, such as cosmetics are filled in each tube 2 from the 
bottom of the body portion 3 of each tube 2, the head portion 6 of which 
is connected with the adjacent head portion 6 as shown in FIG. 3, the 
respective bottoms of the body portions 3 are at the same time heated and 
pressed to form the heat sealing portions 8 by melting and sealing them. 
The bottom of one body portion 3 is connected to the bottom of the 
adjacent body portion or portions 3 at the respective heat sealing 
portions 8, thereby constituting the multi-tube container 1, as shown in 
FIG. 1, in which the head portions 6 and the heat sealing portions 8 at 
the bottoms are connected to each other. 
The heat sealing portion 8 formed at the bottom of the body portion 3 is 
flatly pressed at the same time when the bottoms of the body portions 3 
adjacent to each other are molten by heat. The connection structure of the 
heat sealing portion 8 is a structure that the tubes 2 as separated bodies 
are made to adhere to each other by heat and is different from the 
structure of the tube's head and neck portions made of the plastic 
material by injection molding as a united body. That is, since the 
junction between the heat sealing portions 8 is merely connected by 
melting of resin's surface, connection of the heat sealing portion is not 
strong enough and can be separated easily by being torn apart by user's 
fingers. 
Since the multi-tube container 1 according to the invention has the 
structure as described above, when using the contents in one of the tubes 
2, the head portions 6 of and the heat sealing portions 8 at the bottom of 
the tubes 2 are respectively torn apart by user's fingers to separate one 
from the other, as illustrated in FIG. 4. Then the body portion 3 is 
twisted, while the head portion 6 of the tube 2 is fixed by the fingers, 
to break off the narrow neck portion 5 located at the top and in 
continuation with the head portion 6, thereby creating an opening fir 
extruding the contents at the broken point. 
In this embodiment, it is preferable to provide a pitch or intervals 
between each of the tubes 2 about 1 mm longer than half of the length of 
the circumference of the body portion 3, so that any overlap of the 
bottoms of the tubes 2 adjacent to each other when the bottoms are flatly 
pressed about 1 mm longer than the half length of circumference of the 
body portion 3 of the By this pitch, the container 1 automatically obtains 
intervals such that the extended portions of the bottoms of the tubes 2 
adjacent to each other are unitedly connected to each other when the 
bottoms are pressed and extended to the left and right after heated and 
molten. 
(Second Embodiment) 
In the above embodiment, the head portion 6 is broken at the neck portion 5 
to create the outlet opening. The tubes 22 of a container 21, shown in 
FIGS. 5(A), (B), (C) are constituted such that their head portions 6 are 
connected with pins P in a chain like shape. As apparent from FIG. 5(C), 
after an opening had been created by twisting the head portion 26, the pin 
P firmed at the head portion 26 is inserted into the opening to plug up it 
temporarily. In this second embodiment, the contents need not be used up 
after the opening is made, and only a small amount of the contents can be 
used at a time. 
(Third Embodiment) 
In tubes 32 of a multi-tube container 31 shown in FIG. 6, a male screw 12 
is formed at a circumference of the neck portion 35, and a female screw 13 
capable of engaging with the male screw 12 is formed at an inner 
circumference in a recess located at a top center of the head portion 36. 
In this modification, after the head portion 36 has been broken off to 
create the opening, the head portion 36 is turned upside down so that the 
head portion 36 can be used as a cap to engage with the neck portion 35. 
(Fourth Embodiment) 
FIGS. 7(A), (B), (C) are schematic diagrams of a fourth embodiment of a 
multi-tube container 41 in which each tube 42 is connected at its neck 
portion 45 and its heat sealing portion 8 at the bottom. With this 
embodiment, pins P formed at the head portions 46 are constituted, as 
different from one shown in FIGS. 5 (A) to (C), so as to project upward 
therefrom. The pin P can be inserted into the opening and to plug up the 
opening temporarily. 
(Fifth Embodiment) 
FIGS. 8(A), (B), (C) show a structure that the tubes 52 are connected at 
their neck portion 55 and heat sealing portions 8 at the bottoms of the 
body portion 3. In this multi-tube container 51 according to the fifth 
embodiment, the head portion 56 constitutes a screw cap, and therefore, 
the cap type head portion 56 can engage with a male screw 12 formed at the 
neck portion 55, thereby plugging up the opening temporarily. 
(Sixth Embodiment) 
A sixth embodiment shown in FIGS. 9(A), (B), (C) is a further improved 
multi-tube container 1 in comparison with the container 61 shown in FIG. 
1. In this embodiment, the tubes 62 are connected with each other at their 
head portions 66, at the bottoms of the body portions 3, and further at 
their neck portions 65, so that the connection among the tubes 62 are 
strengthened. 
The multi-tube container, as well as its manufacturing method, has the 
following advantages because it has the constitution and operation as 
described above. The multiple tubes can be connected at either or both of 
the head portions and the neck portions, and further at the bottoms. In 
particular, sealing work and the connection work of the bottoms can be 
done together, since the respective tubes are connected at the heat 
sealing portions at the bottoms. Since the bottoms are connected in 
addition to the tops, the entire structure of the multi-tube container 
becomes united and stable. Each tube can be easily detached from others 
and be disposable respectively. In particular, the vertical groove can be 
formed at the connection of the tops of the respective tubes, so that 
cutting for detaching of the tube can be done easily at the vertical 
groove. Inserting plastic material sleeves or cylinders in the cavity of 
the mold for injection molding and arranging them in parallel allows to 
form the shoulder, neck, and head portions of the tubes and, at the same 
time, to connect the tops of the tubes with each other. Therefore, the 
container can be inexpensively produced in a large amount. 
It is understood that although the present invention has been described in 
detail with respect to preferred embodiments thereof, various other 
embodiments and variations are possible to those skilled in the art which 
fall within the scope and spirit of the invention, and such other 
embodiments and variations are intended to be covered by the following 
claims.