JPS5951054A - Tube made of synthetic resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention relates to improvements in plastic tubes.

Plastic tubes have been known for a long time, and the applicant of this patent also disclosed an improved manufacturing method in Japanese Patent Application Laid-Open No. 57-6735.
I proposed it in the issue. These plastic tubes are becoming widely used in various fields where aluminum tubes were previously used, and in fact, the paste-like contents can be squeezed out from the head by pressing the body of the tube from the rear end. It can be extruded from aluminum tubes without any problems in the same way as aluminum tubes.

However, for some applications, for example, put mimeograph printing ink inside, set it on a rotary type mimeograph machine with the mouth of the head facing upward, and suck out the ink inside from the mouth of the head with a pump. When the ink inside is sucked out and the upper part of the body becomes empty, the inner surface of the plastic cylinder wall that makes up the body will open in the direction perpendicular to the longitudinal direction of the cylinder wall. They stick together in a straight line under negative pressure and collapse,
When this happens, the ink remaining below will no longer come out of the head opening, and the ink supply will stop.

Figure 1 shows the situation. / is the thin plastic cylinder wall that makes up the body, and / is the plastic head fitted to the upper end of the cylinder wall, with an umbrella-shaped head. A loco protruding from the top of the end wall is screwed into the lower end of the suction pipe 3 from the pump and removed, and the printing ink content is sucked out through the suction pipe 3. The upper end of the cylindrical wall /' is expanded into a cylindrical shape by the end of the head and the lower periphery of the ring with the same diameter as the cylindrical wall extending from the head end, so it absorbs ink without any problem at first. However, if the suction progresses to the extent that the upper part of the body becomes empty and the top surface of the ink drops below the area where the head extends the cylinder wall, the ink will be drawn out through the suction pipe and the upper part of the body becomes empty. Due to the negative pressure acting on the cylinder wall, the inner surfaces of the cylinder walls are brought into close contact with each other in a horizontal and linear manner and are immersed, thereby blocking the ink remaining below from going to the suction pipe.

In this respect, aluminum tubes do not have this problem, so
In this way, aluminum tubes are used for 1ψ in applications where the contents are sucked out under negative pressure, which has been a bottleneck to the widespread use of plastic tubes.

In this way, when the contents are sucked out with the suction tube 3, the collapse/α occurs. It is determined by the material and thickness of the wall and can be determined experimentally. For example, the head part is made of polyethylene resin, the thickness of the end wall and the annular lower peripheral part that reaches below it is 1.5 mm, the cylinder wall is made of polyethylene (sealed with a thickness of 0.35 mm), and the head part is made of polyethylene (sealed with a thickness of 0.35 mm). If the diameter of the lower periphery and the cylinder wall is 60 mm, 7tj1 from the upper end of the lower periphery.
The distance at which collapse/α occurs is approximately 80 mm, which is constant.

Therefore, the present invention was successfully developed as a result of 1iJF research with the aim of solving the above-mentioned problems of plastic tubes.The principle is that the upper end communicates with the mouth λ' on the inner surface of the head, and the lower end The system has a suction pipe that reaches below the point where collapse/α occurs when sucking out the contents, and by sucking out the contents through this suction pipe and into the suction pipe, the entire amount can be sucked out without any problem. This will be described below with reference to the illustrated embodiment.

Figures 2 and 3 show one embodiment of the present invention, where S indicates the above-mentioned suction pipe, which communicates with the loco' on the inner surface of the head part, and connects the connecting cylinder 6 in the opposite direction to the loco'. The upper end of the suction pipe S is attached to this connecting cylinder 6. The suction pipe S may not be attached separately from the head part in this way, but may be formed integrally with the head part when the head part is molded.

In this embodiment, the suction pipe 3 is attached to the connecting cylinder (B) by forming an annular groove 7 on one side of the inner periphery and the outer periphery of the upper end of the suction pipe, and on the other side, an annular groove 7 that engages with the recess. A protrusion g is provided, and the snap fit is performed, but the invention is not limited to this, and any other suitable method may be used, such as screwing in with a screw, other tight friction fitting, or bonding.

The length of the suction pipe S is determined so that the lower end S' is located below the point where the cylinder wall collapses when the contents are sucked out with the suction pipe, and preferably, as shown in the figure, located inside the end,
let A hole or a notch 9 is provided on the circumferential side of the lower end S' of the suction 13 if necessary.

As a result, the contents are filled into the cylinder wall, the rear end is sealed, and the product is made.For one-time use, the cap of the loco' is removed, the mouth is connected to the suction pipe 3, and the contents are discharged with negative pressure. When sucking, the contents of the part where the tip S' of the suction pipe S is located are initially sucked out, and as the suction tube S is sucked out, the contents above it fall by their own weight and are sucked out together with the contents below. . Therefore, the inside of the cylinder wall is emptied from the top, and even if it collapses, the contents will be completely empty.
It can be sucked out into the suction pipe 3 through the suction pipe 3 without any trouble.

In this case, if the length of the cylindrical wall is long and there is a sufficient distance between the lower end S' of the suction pipe S and the rear end of the face wall, the suction progresses and the upper surface of the contents moves to the lower end of the suction pipe J. If it is lower than this, there is a risk that the cylinder wall l will come into close contact with each other under the lower end S' of the suction pipe and be crushed due to the negative pressure acting on it. Therefore, especially in such a case, it is preferable to position the lower end of the suction tube inside the rear end of the cylinder wall as shown in the figure and to suck out the contents from below in order to eliminate this possibility.

However, unless the length of the cylindrical wall is particularly long, the suction pipe may have a length that is below the position where the leak/a occurs. For this reason, whether the suction pipe is installed separately from the head or molded integrally with the head, if it is set to a predetermined constant length, the length of the cylinder wall will depend on the type and size of the contents. There is no problem even if the temperature fluctuates. However, if the lower part s' of the suction pipe is located at the rear end of the cylinder wall as described above, it may be made separately from the head and attached, or the suction pipe may be molded integrally with the head. The length is determined according to the longest cylinder wall, and if a short cylinder wall is used, it can be cut down from the bottom end according to the length of the cylinder wall. Of course, if the suction pipe is made separate, it is also possible to create and use suction pipes with different lengths depending on the length of the cylinder wall.

In Figures 2 and 3, the suction pipe S on the shim flow side is open at the lower end S', and holes and notches 9 are provided on the lower end circumference as necessary.
If there is a hole or notch t, the lower end may be 1!1.

However, in this way, the suction pipe S is opened into the partition wall only at the lower end.
The suction is not limited to 1n, but as shown in the embodiment of FIG. 4 and A5, the suction 1! If the lower end of i is placed below the position where collapse/α occurs when the contents are sucked out with the suction pipe 3, preferably inside the rear end of the cylinder wall as described in ^II, the suction a. Upper, middle, lower, etc. (5jl to 'j
f) Opening holes and slits/θ on the circumference (fourth
(Fig. 5), or holes or slits may be provided along the entire length of the suction pipe (Fig. 5).

In other words, in this case, the contents enter the suction Q through the appropriate holes and slits 10..., //... under negative pressure and are sucked out. This is because even if the upper part of the inner part of the calyx wall is extracted from the hole or slit and becomes empty and collapse/α occurs, the contents continue to be sucked out through the hole or slit below.

In addition to sucking out the contents with the suction tube, the embodiment shown in Fig. 4.5 can also be used as is to squeeze out the contents from the mouth by pressing around the torso with your hands. It has the advantage of saving. In this case, in order to prevent the contents from remaining inside the suction tube, it is preferable that the suction tube has a compressive elasticity that will become flat when pressed with a certain amount of force.

In addition, when a hole is provided along the entire length of the circumference of the suction pipe, the suction pipe has a mesh-like protector on the circumference to accommodate one club at a distance in a golf caddy bag. A tube can also be used, which saves the trouble of making holes and slits.

In this way, according to the present invention, synthetic resin tubes can be popularized in fields where synthetic resin tubes have not been used heretofore. Furthermore, when filling with the contents, the contents also enter the suction tube, so the size of the tube does not need to be particularly large to accommodate contents of the same shape. Furthermore,
Contents that can only be used by squeezing out with your hands 2z When filling the beak, it is best to cut off the suction pipe that is integrated with the head, or shorten the separate suction pipe by an inch, so the head can be removed. D can be used for 1st official.

As described above, the present invention is an excellent example of the ability to expand the use of Kuranari-made resin tubes to the field of suction.

In addition, the synthetic resin tube wall can be molded seamlessly into a cylindrical shape using the In/Fun Yon method, or it can be molded into a sheet shape.
Although it is possible to create a cylindrical shape with a seam by fusing the side edges together, in the present invention, 7) the cylindrical wall may be formed in either of these ways.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of a conventional synthetic resin tube in which the problem occurred; Fig. 2 is a side view of a part of an embodiment of the present invention; The figure is a side view of the same head and suction pipe in an exploded state, FIG. 4 is a side view of a half section of the second embodiment, and FIG. 5 is a side view of a half section of still another embodiment of the present invention. In the figure, / is the cylinder wall, C is the head, λ' is the mouth, G is the contents, S is the suction pipe, S' is the lower end, /α is the collapsed part of the cylinder wall. Show parts. Patent applicant Tochisen Kasei Kojo Co., Ltd. Figure 1
Figure 2 @4% figure

Claims (1)

[Claims] (1) A head having a mouth at the top of the end wall is fixed to the inner periphery of one end of the plastic cylinder wall, the contents are filled into the cylinder wall, and the rear end of the cylinder wall is sealed. The synthetic resin tube is characterized by having a suction pipe on the inner surface of the head whose upper end communicates with the mouth and whose lower end is located below the position where the tube wall collapses when suctioning out the contents from the mouth. Synthetic resin tube. (2. In the synthetic resin tube according to claim (1), the suction pipe is a synthetic resin tube whose lower end is open. (3) The synthetic resin tube according to claim (1) or (2). In the tube, the lower end of the suction pipe is a synthetic resin tube located in a part of the rear end of the cylinder wall. (4) Claims (l to (3) J) In any one synthetic resin tube, A synthetic resin tube with openings as many as necessary around the circumference of the suction pipe.