JPH0214298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for welding a separate glass tube to a glass vessel and connecting the glass tube to the glass vessel, and particularly relates to a method for welding a separate glass tube to a glass vessel and connecting the glass tube to the glass vessel. The present invention provides a method suitable for use in the process of manufacturing double-mouth vacuum bottles.

Traditionally, the vacuum double bottle used as the middle bottle for general magic bottles had an injection spout only at the top, but in recent years magic bottles that are filled from the top and dispensed from the bottom have become popular. Nowadays, there is a demand for tea bottles equipped with a liquid volume meter, and a double-ended vacuum bottle with an opening at the bottom is also required.

FIG. 1 shows an example of such a double-ended vacuum bottle. This double-ended vacuum bottle 1 consists of an inner bottle 1a and an outer bottle 1b, and has a cylindrical body 2.
The diameter of the upper part gradually decreases to form the neck 3,
An upper opening 4 is opened inside the neck 3. Further, a bottom part 5 is formed at the lower part of the body part 2, a lower mouth pipe 6 is formed in the center of the bottom part 5, and a lower mouth 7 is formed in the lower mouth pipe 6.
is open. The inner bottle 1a and the outer bottle 1b are
The body parts 2a, 2 are spaced apart from each other with a slight gap 8.
b, bottom parts 5a, 5b, neck parts 3a, 3b, and lower mouth pipes 6a, 6b are formed, and the inner bottle 1a and the outer bottle 1b are connected at the upper ends of the neck parts 3a, 3b and the lower ends of the lower mouth pipes 6a, 6b, Joint parts 9 and 10 are formed. Reference numeral 11 denotes an exhaust pipe provided at an eccentric position on the bottom 5b of the outer bottle 1b, which is sealed after exhausting the air between the gap 8 between the inner bottle 1a and the outer bottle 1b, and maintains the gap 8 in a vacuum. are doing.

When manufacturing this double-ended vacuum bottle, since the bottom part 5 has a lower opening pipe 6, the conventional manufacturing process for general vacuum double-bottom bottles cannot be applied as is. As a conventionally known method for manufacturing a double-ended vacuum bottle with openings at the top and bottom, for example,
Publication No. 33-5340 discloses a method of polymerizing two inner and outer cylinders with the lower part reduced in diameter and welding the upper and lower ends to make a double-ended vacuum bottle.In this method, the lower part is reduced in diameter. Therefore, the diameter cannot be made sufficiently small compared to the body, and furthermore, the upper opening has the disadvantage that it can only have the same diameter as the body. Furthermore, Japanese Utility Model Publication No. 37-1194 discloses a method of forming an inner bottle and an outer bottle by abutting and welding the large diameter ends of bottles, one of which is blown to a large diameter and the other to a small diameter. However, since two separately blown bottles are butted together, it is extremely difficult to match them accurately due to distortion of the bottles and variations in diameter and wall thickness. Furthermore, Japanese Patent Publication No. 50-25391 also discloses a method for manufacturing double-ended vacuum bottles.
In the double-ended vacuum bottle obtained by this method, since the bottom opening is a single glass tube, the heat retention effect as a double-ended vacuum bottle is not sufficient. In addition, in these conventional examples, the shape of the fabric used for the inner and outer bottles is significantly different from that of ordinary vacuum double-sided bottles, and the manufacturing process is different from that of ordinary vacuum double-sided bottles. Due to the large difference, it was not possible to put it on the normal production line, and a significant increase in costs could not be avoided.

In view of these circumstances, the inventors first produced a double-ended vacuum double-ended bottle by using bottle fabric for regular vacuum double-bottomed bottles and making slight additions to the normal process and equipment. He invented a method that could do this and filed a patent application. This method involves welding separate glass tubes to the center of the bottom of the bottle bodies of ordinary inner bottles 1a and outer bottles 1b, and communicating the glass tubes into the bottle bodies to form lower mouth tubes 6a and 6b. This inner bottle 1a and outer bottle 1b are polymerized to form necks 3a and 3b.
The upper end and the lower end of the lower tubes 6a, 6b are welded together to form a double-ended bottle.

This method is superior in terms of cost reduction compared to the conventional method of producing the same kind of double-ended bottles, but it also has the added step of welding the bottom pipe to the bottle body to make it communicate. . The conventional process of welding a pipe to a bottle body and making it communicate is a process of attaching an exhaust pipe 11 to the bottom 5b of the outer bottle 1b. This step is usually carried out on the bottom 5 of the outer bottle 1b.
Bring the ends of the glass tubes close to each other and support them, heat the parts to be welded from the inside of the outer bottle to melt the glass, and blow air into the glass tubes to blow out the molten glass to connect the holes. Then, the peripheral edge of the hole and the end of the glass tube are welded to make the glass tube an exhaust pipe. In the process of attaching the lower outlet pipe mentioned above, it can be attached basically by the same operation, but since the inner diameter of the lower outlet pipe is larger than that of the exhaust pipe, it is difficult to attach it to the bottle body. The pores formed will be correspondingly large. The glass in the hole is gathered around the periphery of the hole, but since the area of the hole is large, a large amount of glass is gathered around the periphery of the hole, resulting in a thick wall and the welded part with the lower mouth tube. The shape becomes complicated, distortion occurs, and it becomes extremely easy to break. Another conventional method is to make a hole in the welded part of the bottle body and weld a glass tube around the periphery of the hole, but this method requires the process of making a hole in the bottle body by some method. and is not desirable.

The present invention has been made to solve these problems, and it does not require pre-drilling holes in the bottle body, and does not form an excessively thick part at the welded part between the bottle body and the lower mouth tube. This provides a method that allows a smooth shape.

FIG. 2 shows the steps of the present invention in order, and 12 is a bottle body and 13 is a glass tube.
First, in step A, the glass tube 13 is supported so that its axis faces upward and downward, and the bottle body 12 is supported close to the upper end of the glass tube 13. Note that bringing the glass tube 13 and the bottle body 12 close together includes a state in which they are in contact with each other. Rather, in actual operation, the two are brought into contact, but when they are supported separately, they do not necessarily come into exact contact, and there is no need for them to make exact contact. There is no such thing, and it is sufficient that the two are in an extremely close positional relationship. Also, a predetermined interval can be intentionally set between the two.

Next, in step B, while rotating the bottle body 12 and the glass tube 13 about the central axis of the glass tube 13 as the rotation axis, the bottle body 12 and the glass tube 13 are
The part where the glass tube 13 is to be welded is ignited with a gas burner 14. As a result, the wall surface of the bottle body 12 is locally melted, and the melted portion sag slightly due to its own weight, comes into contact with the upper end of the glass tube 13, and is temporarily welded.

Next, in step C, air is blown into the glass tube 13 to pressurize it. At this time, since the part of the wall of the bottle body 12 surrounded by the glass tube 13 is melted, it is easily blown out by air pressure and the through hole 1
5 is formed. If you continue heating at this point,
The edge 16 of the blown through hole 15 is brought to the upper end of the glass tube 13 by its own weight and surface tension, and the shape of the periphery of the through hole 15 is adjusted.
The flame of the gas burner 14 also ignites the inside of the through hole 15, and the peripheral edge and the upper end of the glass tube 13 are firmly welded. This state is shown in step D.

Conventionally, when attaching an exhaust pipe to a bottle body, the process is completed up to this point, but when a lower mouth pipe is attached, a large lump 17 is formed at the periphery of the through hole 15. As the wall thickness increases locally, the glass tube 13 on the wall of the bottle body 12
The outer part of the glass tube 13 sags due to its own weight, and an acute cut-in part 18 is formed between it and the outer peripheral surface of the glass tube 13. Therefore, if it is cooled as it is, complicated distortions will occur around the thickening areas 17 and bites 18, making it extremely susceptible to breakage.

Therefore, in the present invention, step E is added, and in this step E, the glass tube 13 is pulled downward. As a result, the biting 18 is caused by the bottle body 12
It becomes a smooth curved surface extending from the outer surface to the outer periphery of the glass tube 13, and the wall pocket 17 is drawn by the glass tube 13 and extends downward, and the wall thickness becomes thinner.

According to the present invention, there is no need to make a hole in the bottle body 12 in advance, and the large-diameter lower outlet pipe can be attached in substantially the same way as the exhaust pipe is attached. It can be incorporated into the double-bottle production line with only a few changes. Moreover, since a step is added to pull the welded glass tube downward, even in the case of a large-diameter bottom tube, there is no excessive build-up or digging in the welded area, and the wall thickness is reduced. This creates a welded part with a smooth curved surface with little change, resulting in a strong weld.

In the example, in step E, the glass tube 1
I said to pull down 3, but this is bottle body 1.
2 may be raised. In short, it is only necessary to move the bottle body 12 and the glass tube 13 in a direction in which they are separated from each other.

The method of the present invention is not limited to the case of attaching the bottom pipe of a double-ended vacuum bottle, but may be applied to the case of attaching an exhaust pipe. Furthermore, the present invention can also be applied to other general glassware in which glass tubes are attached, such as in the production of scientific glassware such as three-necked flasks and separating funnels, and coffee siphons.

[Brief explanation of drawings]

FIG. 1 is a central vertical cross-sectional view of a double-ended vacuum bottle manufactured by applying the present invention. FIG. 2 is an enlarged longitudinal cross-sectional view of the main parts sequentially showing the steps of the present invention. 12... Bottle body (glass vessel), 13... Glass tube.

Claims (1)

[Claims] 1. Support the glass tube with its axis facing up and down, and support the glassware close to the upper end of the glass tube, heat the part of the glassware to be welded from above to melt it, and transfer the molten part to the The upper end of the glass tube is temporarily welded, and then air is blown into the glass tube to blow the wall of the glass container surrounded by the glass tube with a pressure difference to form a through hole, and the glass around the through hole is melted. to the upper end of the glass tube and weld the upper end of the glass tube to the peripheral edge of the through hole,
A method of welding a tube to a glassware and making them communicate, the method comprising adjusting the shape of the welded part by subsequently moving the glassware and the glass tube relatively apart.