JPS6159962B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sealing device for a tightly and firmly welded tail portion of a synthetic resin tube container.

[Conventional technology]

The tail part of a synthetic resin tube container is made by clamping the end of the tube in a flattened state between a holding jig and a solid horn, and melting and welding the resin material using ultrasonic waves acting through the solid horn. It is molded by sealing.

The tail part of this synthetic resin tube container is made by melting a part of the synthetic resin material that is the molding material.
Previously, a strong weld seal was achieved across the entire tail, so some of the melted resin material was
The pressing force between the receiving jig and the solid horn causes the seal to protrude from the tail portion, resulting in the inconvenience of forming an unnecessary burr around the tail portion, especially at the seal end.

As a conventional means to solve this problem, the tail part is strongly and tightly welded and sealed with a globe part, and a knurling part is lightly welded adjacent to the globe part to form a decorative protruding pattern. A tube container is formed, comprising a portion and a lightly welded seal end portion forming the termination of the knurl portion and also forming the termination of the tail portion.

The tail portion 11 of the tube container described above is
As shown in FIGS. 1 and 2, from the side of the container body 10, which is the main body portion of the tube container, a seal end portion 1 is formed as a glove portion 11a and a knurl portion 11b.
1c.

The globe part 11a includes a welded seal part 11a' which is the main part that achieves the welded seal in the tail part 11, and a resin that melts adjacent to this welded seal part 11a' and flows from the welded seal part 11a'. A knurled portion 11b provided adjacent to the glove portion 11a is a portion that shapes a decorative protruding pattern 11b'. The pattern 11b' may be used to display the manufacturer's mark, product number, or even model number.

The sealing device for forming the tail portion 11 having such a structure consists of a holding jig 20 and a solid horn 21, which crush the end of the tube into a flat shape, weld and seal the end portion of the tube while holding it, and form the tail portion 11. The receiving jig 20 and the solid horn 2
The mold surface of No. 1 includes weld seal molds 20a' and 21a' for molding weld seal portion 11a' and reservoir portion 1.
Glove part molds 20a and 21a consisting of reservoir molds 20a" and 21a" for molding a knurl part 11b having a protruding pattern 11b';
b and 21b, and the seal end portion 11c
Seal end molds 20c and 21c for molding
Each mold surface of the receiving jig 20 and the fixed horn 21 facing each other, that is, the glove part mold 20
The intervals between a and 21a, the knurl molds 20b and 21b, and the seal end molds 20c and 21c are set to be equal.

The above-described conventional sealing device has storage molds 20a'', 21 adjacent to welding seal molds 20a', 21a'.
a'' is arranged, the molten resin extruded from the welding seal part 11a' is stored in the storage part 11a'',
This has the effect of preventing the molten resin of the welded seal portion 11a' from flowing out of the tail portion 11 and causing the burr 12, which is an unnecessary molded product, to be improperly molded.

[Problem that the invention seeks to solve]

However, in the above-described sealing device, since the spacing between the opposing mold surfaces of the receiving jig 20 and the solid horn 21 is set equal, when the receiving jig 20 and the solid horn 21 are clamped together, the knurled part mold 21
b, 21b and seal end molds 20c, 2
The tube end between 1c is a globe part mold 20a,
As a result, part of the melted resin material forming the knurled portion 11b and the seal end portion 11c flows toward the seal end portion 11c. As a result, the burr 12 was pushed out from the end face of the tail portion 11, and the burr 12 shown in FIG. 1 was formed as before.

The present invention has been devised to solve the above-mentioned problems in the conventional example, and it is not necessary to achieve a strong welding in the entire tail part in order to tightly seal the tail part of a tube container. Utilizing the fact that it was confirmed that it is sufficient if the weld seal in the weld seal part is perfect, and that the knurl part and the seal end part are good if they can self-retain their flattened shape, The purpose of this invention is to ensure a strong welded seal at the tail, give the tail a good appearance, and reliably prevent burrs from forming on the tail.

[Means for solving problems]

Hereinafter, a sealing device according to the present invention will be explained with reference to FIGS. 3 to 5 showing one embodiment of the present invention.

The sealing device according to the present invention connects an open end of a synthetic resin tube to a receiving jig 30 and a solid horn 3.
By flattening the tube with 1 and welding and sealing it while holding it, welding seal part 11a' that is strongly and tightly welded toward the terminal end of the tube and adjacent to this welding seal part 11a' A globe part 11a is composed of a reservoir part 11a'' that accommodates the molten resin extruded from this welded seal part 11a', a relatively wide knurl part 11b having a protruding pattern 11b', and this knurl part 1.
This is for molding the tail part 11 in which the seal end part 11c forming the terminal end of the seal end part 1b is positioned in order, and the mold surface of the above-mentioned receiving jig 30 and solid horn 31 is used to mold the globe part 11a. Glove part molds 30a and 31a for forming the knurl part 11b, and knurl part molds 30b and 31b for forming the knurl part 11b.
and seal end part molds 30c and 31c for molding the seal end part 11c are arranged in order, and with the receiving jig 30 and the fixed horn 31 clamped, the opposing knurl part molds 30b and 31b and the seal The distance between the end molds 30c and 31c is
The distance is set to a value larger than the distance between the glove part molds 30a and 31a.

As mentioned above, the distance between the mold surfaces of the knurl molds 30b and 31b and the seal end molds 30c and 31c is determined by the distance between the glove molds 30a and 31a, or more precisely, the distance between the welding seal molds 30a' and 31a'. is also set to a large value, but the distance between the glove part molds 30a and 31a, or more precisely the distance between the welding seal molds 30a' and 31a', is the same as in the conventional case. Needless to say, the value is set so that a strong pressing force can be applied to the portion.

That is, in a state where the receiving jig 30 and the solid horn 31 are clamped, the welding seal molds 30a' and 3
The mold surface interval with 1a' is the knurl part mold 30b and 31b.
The distance between the mold surfaces of the seal end molds 30c and 31c is set to be smaller than that of the mold surfaces of the seal end molds 30c and 31c.

By the way, welding and sealing of the tail portion 11 using the receiving jig 30 and the solid horn 31 is achieved by melting the resin material due to the heat generated between the tube walls brought into pressure contact by the action of ultrasonic waves. However, the distance between the knurl part molds 30b and 31b and the seal end part molds 30c and 31c is the same as that of the glove part mold 3.
Since the value is set to be larger than the distance between 0a and 31a, the knurl portion 11b and seal end portion 11c located between the knurl portion molds 30b and 31b and the seal end portion molds 30c and 31c.
are pressed with a light pressing force, but even with a light pressing force, the knurl portion 11b and the seal end portion 11c remain in a pressed state.
The resin material in the part also becomes molten.

Therefore, depending on conditions such as the molding time of the tail portion 11 and the wall thickness of the tube, this knurl portion 1
It is conceivable that the molten resin material in the seal end portion 1b and the seal end portion 11c may flow out to the end of the tube due to the pressing force.

Therefore, if the holding plate 32 that comes into contact with the end face of the flattened tube is provided in the holding jig 30 in advance in a state in which it does not contact the solid horn 31 with an interval β, the end face of the tube It is possible to reliably prevent the molten resin material from flowing out to the side, thereby reliably preventing the burr 12 from forming on the end face of the tail portion 11.

[Effect]

Since the sealing device according to the present invention has the above-described configuration, the receiving jig 30 and the solid horn 3
1 is clamped while flattening the end of the tube, and when ultrasonic waves are applied from the solid horn 31, the tube is pressed flat by the receiving jig 30 and the solid horn 31, forming a pressing abutment. The resin material on the inner circumferential surface of the tube ends that are in contact with each other melts due to heat and welds to each other.

At this time as well, in the welded seal part 1a' which receives the strongest pressing force, a part of the melted resin material is pushed out due to this strong pressing force, moves to the adjacent storage part 11a'', and is stored there. .

In addition, the knurl portion 11b and the seal end portion 1
In 1c as well, the resin material in contact melts, but
The pressing force acting on both parts is not strong;
Since the knurled portion 11b is provided with a protruding pattern 11b' portion that provides a space that can sufficiently accommodate the molten resin that is about to flow, most of the molten resin does not melt in the knurled portion 11b and the seal end portion 11c. The resin material acts on the spot for welding and sealing without flowing.

As described above, in the sealing device according to the present invention, the distance between the surfaces of the molds that mold the knurl portion 11b and the seal end portions 11c is smaller than the distance between the surfaces of the molds that mold the welded seal portion 11a' during mold clamping. Since is set to a large value, it is possible to prevent almost any flow of the molten resin material generated in the knurled portion 11b and the seal end portion 11c during welding and sealing, and thereby the knurled portion 11b and the seal end portion In order to prevent the molten resin material generated at 11c from flowing out from the end surface of the tail section 11, there is no burr 1 on the end surface of the tail section 11.
There is no modification of 2.

In addition, since the pressing force applied to the tube end by the receiving jig 30 and the solid horn 31 is concentrated on the welded seal portion 11a', welding sealing of the welded seal portion 11a' can be reliably and firmly achieved. In addition, it is possible to generate a strong pressing force against the welded seal portion 11a' with a pressing force that is weaker than that of the conventional method.

Furthermore, the receiving jig 30 and the solid horn 31 are
Weld the mold surfaces of the knurl part molds 30b, 31b and the seal end part molds 30c, 31c to the seal mold 30a',
It has a simple structure that only needs to be slightly recessed than the mold surface of 31a', so even if the jig 30 and the solid horn 31 are just installed, it can be easily cut. This means that the invention can be put into practice.

〔Example〕

In the case of the illustrated embodiment, in order to make the weld seal strength of the tail portion 11 greater and more reliable,
Two welded seal portions 11a' are provided in parallel with the reservoir portion 11a'' in between.

In this case, storing the molten resin material flowing from the two welded seal parts 11a' in one storage part 11a'' may result in insufficient capacity, but the adjacent knurled part 11b The tail portion 1 of the molten resin material functions as a storage portion for the molten resin material in the seal portion 11a'.
1. There is no fear of leakage outside.

In addition, the knurl part molds 30b and 3 at the time of mold clamping
1b and the seal end molds 30c and 31c are larger than the mold surface distance between the welding seal molds 30a' and 31a' by using the receiving jig 30.
and solid horn 31 both knurl molds 30b,
31b and the mold surfaces of the seal end molds 30c and 31c are recessed by a set width α from the mold surfaces of the welding seal molds 30a' and 31a'.

However, the means for making the interval between the welding seal molds 30a' and 31a' smaller than the other mold surface intervals is not limited to the illustrated means; for example, either the receiving jig 30 or the solid horn 31 can be used. This can also be achieved by positioning the mold surfaces of the knurl mold and seal end mold to be recessed from the welding seal mold by a distance of 2α.

〔Effect of the invention〕

As is clear from the above description, the sealing device according to the present invention can reliably prevent the generation of burrs, which are unnecessary molded products, while firmly and reliably achieving a welded seal on the tail portion. As a result, the appearance of the tail part of the tube container can be improved, unnecessary work such as burr removal can be eliminated, and the welded seal part, which should achieve a strong and reliable welded seal in the tail part, can be made smaller. It is possible to mold reliably and strongly despite the operating force, and this eliminates the occurrence of defective products due to insufficient welding sealing force due to dispersion of the operating force, and the structure is simple. Regardless of whether it is a general installation or a new installation, it can be implemented easily and inexpensively, and has many excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a front view of main parts showing the tail portion of a conventional tube container. FIG. 2 is an enlarged vertical cross-sectional view of a main part showing a state in which a tail is formed by a conventional tail sealing device. FIG. 3 is an enlarged longitudinal cross-sectional view of a main part showing a state in which a tail portion is being formed by an embodiment of the apparatus of the present invention. FIG. 4 is a plan view showing a mold surface portion of the solid horn in the embodiment shown in FIG. 3. FIG. FIG. 5 is a front view of essential parts showing the tail portion of a tube container formed by the apparatus of the present invention. Explanation of symbols 10... Container body, 11... Tail part, 11a... Globe part, 11a'... Welded seal part, 11a''... Reservoir part, 11b... Knurl part, 11
b'...Protruding pattern, 11c...Seal end part, 12...
Burr, 20, 30... Receiving jig, 21, 31... Solid horn, 20a, 21a, 30a, 31a... Globe part mold, 20a', 21a', 30a', 31a'... Welding seal mold, 20a'', 21a'' , 30a'', 31a''...Reservoir type, 20b, 21b, 30b, 31b...Knurl part type, 20b', 21b', 30b', 31b'...Protruding pattern type, 20c, 21c, 30c, 31c...Seal end part type , 32... presser plate.

Claims (1)

[Scope of Claims] 1. The open end of the synthetic resin tube is flattened between the receiving jig 30 and the solid horn 31, and while being held, welded and sealed, and then firmly pressed toward the end. A globe part 11a consisting of a welded seal part 11a' which is tightly welded and sealed, and a reservoir part 11a'' in which the molten resin pressed from the welded seal part 11a' is placed adjacent to the welded seal part 11a'; , a sealing device for forming a tail portion 11 in which a relatively wide knurl portion 11b having a protruding pattern 11b′ and a seal end portion 11c forming a terminal end of the knurl portion 11b are positioned in this order,
The mold surfaces of the receiving jig 30 and the solid horn 31 are formed by glove part molds 30a and 31a for molding the globe part 11a, knurl molds 30b and 31b for molding the knurl part 11b, and the seal end part 11c. Seal end molds 30c and 31c for molding are arranged in order,
With the receiving jig 30 and the solid horn 31 clamped together, the opposing knurl molds 30b and 31b
and a tail sealing device for a synthetic resin tube container, wherein the distance between the seal end molds 30c and 31c is set to a value larger than the distance between the glove molds 30a and 31a. 2. The open end of the synthetic resin tube is flattened between the receiving jig 30 and the solid horn 31, and the tube is welded and sealed while being held therebetween. A globe part 11a consisting of a welded seal part 11a' and a reservoir part 11a'' in which the molten resin pressed from the welded seal part 11a' is placed adjacent to the welded seal part 11a', and a protruding pattern 11b'. A sealing device for forming a tail portion 11 in which a relatively wide knurled portion 11b and a seal end portion 11c forming a terminal end of the knurled portion 11b are positioned in this order,
The mold surfaces of the receiving jig 30 and the solid horn 31 are formed by forming the glove part molds 30a and 31a for molding the globe 11a, the knurl molds 30b and 31b for molding the knurl part 11b, and the seal end part 11c. The seal end molds 30c and 31c to be molded are arranged in order, and with the receiving jig 30 and the solid horn 31 clamped together, the opposing knurl molds 30b and 31b and the seal end mold 30c are formed. and 31c is set to a value larger than the distance between the globe part molds 30a and 31a, and further, the solid horn 31 is in contact with the end face of the flattened end part.
A tail portion sealing device for a synthetic resin tube container, comprising a presser plate 32 fixed to the receiving jig 30 without contacting the holding jig 30.