JPH02160629A - Production of hollow glass vessel and device therefor - Google Patents

Abstract

PURPOSE:To obtain an article having excellent appearance without bead in low cost by using burner installed in separating to two stages of upper and lower of heating burner and cutting burner in heating and cutting useless part of mouth part of hollow glass vessel with ring-like burner. CONSTITUTION:Flame port of ring-like burner is separated to two stages of upper and lower to form upper burner 7 and lower burner 9. Then, a hollow glass vessel 1 molded by blow molding and having useless moil part 2 is held by vacuum chuck 5 with keeping the moil part 2 lower and inserted into ring- like burner with rotating. Thus, upper burner 7 is burned to heat a cutting part 3 and glass of said part is heated, softened and begins to elongate, then the upper burner 7 is stopped. At the same time, burning of the lower burner 9 is begun and the cutting part 3 is cut out by burning of the lower burner 9 to produce the aimed hollow glass vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION (Objectives of the Invention) (Industrial Field of Application) The present invention relates to improvements in a method and apparatus for manufacturing hollow glass containers such as pots by blow molding.

(Prior art) A hollow glass container generally formed by blow molding method,
For example, due to the necessity of the molding process, the cot tip has a moil portion 2 which is an unnecessary part of the mouth part, as shown in FIG. 6, and this is cut and removed in the process after molding to obtain a finished product.

The method for removing the moil portion 2 involves making fine scratches on the glass surface along the cutting position 3 between the product portion 1 and the moil portion 2 using a wheel made of ultra-hard material, and then applying thermal shock to this portion using a burner or the like. There are two methods, generally called the cranking method, in which the cutting position 3 is heated with a burner and cut off with a burner flame, both of which are widely used.

(Problems to be Solved by the Invention) In the method of cutting and removing the moil portion 2 of the product shown in FIG. It is necessary to make a scratch along the line. Therefore, after the formed product is slowly cooled, a cutting process is performed in which the product is rotated at a constant speed while pressing a wheel made of ultra-hard material with a constant pressure against the glass surface at the cutting position, and then the cut end surface 3a of the product is cut. Rough polishing and then surface melting with a burner, or
A gloss finishing process such as puff polishing is essential.

Although the cracking method provides a product with an excellent appearance, this method requires many cutting steps and is therefore relatively expensive.

With the burn-off method, the hot molded product can be directly transferred to the cutting process immediately after molding.

By burning it off with a burner, the cut end surface 3a becomes a glossy surface as it is, and polishing or the like is not necessary. Therefore, the cost of cutting by the burn-off method is lower than that by the cranking method. However, in the conventional burn-off method, the glass at cutting position 3 is heated by a burner,
When burned off by the burner flame, a thick portion, ie, a bead 4, shown in FIG. 7 is formed on the cut end surface 3a.

The bead 4 is formed by the surface tension of the glass itself, which is softened to a molten state at the cut portion w3 at the same time as the cut portion is burnt off by the burner flame, and as this portion continues to be heated by the burner flame after cutting, It gets even bigger. Although it is possible to keep the bead 4 small to some extent by moving the cut end surface 3a away from the burner immediately after cutting or by turning off the burner, the bead 4 can be kept small to some extent by moving the cut end surface 3a away from the burner or turning off the burner. There are variations in the burn-off equipment in the actual process.
It is equipped with a plurality of burners of about 0 to 36, and each burner has a different combustion state, so it is difficult to perform the above-mentioned shaking in accordance with the cutting time of each burner.

This bead 4 is one of the defects that spoils the appearance of the finished product.

For the above reasons, this problem has been difficult to solve using conventional burn-off methods.

In recent years, there has been a strong tendency in the market to demand bead-free products, and the cracking method makes it possible to obtain bead-free products with excellent appearance, such as the product of the present invention shown in Figure 8. As mentioned above, there is a problem in that the cost is higher than that using the burn-off method.

(Structure of the Invention) (Means for Solving the Problems) The present invention has been made in order to solve the problems of the conventional art as described above. In a method of heating and cutting off unnecessary parts using a ring-shaped burner.

Using a ring-shaped burner whose flame opening is separated into two stages, upper and lower, the upper stage burner is fired during the initial stage of heating the cut part, and after the glass in this part is heated, softens and begins to stretch. , relates to a method and apparatus for manufacturing a hollow glass container, characterized in that an upper burner is stopped, a lower burner starts combustion at the same time, and the lower burner burns out this portion.

The method of the present invention is similar to the conventional burn-off method in that the cut part of the product, which is held with the mouth of the product facing down, is heated and softened by a ring-shaped burner and burned off with a burner frame, but in the conventional burn-off method, heating starts. In contrast, in the present invention, the ring-shaped burner is configured in two stages separated vertically at a constant interval, and the glass of the cut part to be heated is heated from the start of heating to the final step of cutting. The upper burner heats the area until it softens and begins to elongate. After it begins to elongate, the upper burner is stopped and the lower burner starts burning at the same time. The lower burner further heats and softens this area, and the lower burner The basic feature is that it is burnt out using a burner frame.

The device of the present invention consists of a device that holds a glass container with its mouth unnecessary portion facing down so that it can move up and down and rotate once; The present invention is characterized by comprising a shaped burner, a device for switching combustion between the upper and lower burners, and a moil receiving plate that is movable up and down below these burners.

(Function) In the method of the present invention, from the start of heating with two burners, the upper burner is used until the heated part of the glass starts to soften and elongate, and after the glass in this part starts to elongate, the lower burner is used. The function is as follows.

In the process of starting heating with the upper burner and after the heated part begins to expand, switching to heating with the lower burner, by setting the interval between the upper and lower burners to, for example, 1.5 to 3 m, the lower burner The part to be cut is heated by the upper burner and becomes thinner from the part that begins to elongate. Just before cutting, this part is further stretched by the lower burner.

As shown in Figure 11, it has become very thin, and this thinned part is the part 1a heated by the upper burner.
The glass in this region X is softened to a molten state. Therefore, immediately after being cut by the lower burner, the glass in the X portion is pulled upward by its surface tension, and the cut end surface 3a is separated from the lower burner frame as shown in FIG. At this time, the bead formed on the cut end surface 3a is limited to a region X where the glass has been softened to a molten state and has become extremely thin.

Since the amount is small, it is smaller than that in the conventional burn-off method, as shown in FIG. Moreover, as mentioned above, immediately after cutting, the cut end surface 3 a 1
Since the bead is separated from the lower burner frame, it is possible to prevent the bead from growing large due to heating by the burner frame.

(Example) The present invention will be explained in detail with reference to an example. Figures 1 to 4 are for explaining the method of the present invention, and are a partially longitudinal schematic front view of the apparatus of the present invention holding a glass container with moil by suction, and Figure 5 is a schematic front view of the two-stage burner of the present invention. FIG. 2 is a partially cutaway road view taken along line A-A in FIG. 1;

The molded product with moil is as shown in Figure 1.
The chuck 5, which is first inserted into a vacuum chuck 5 having a vacuum hole 13 and held with the moil portion 2 facing downward, is attached to a rotating shaft 6 via a bearing 11° and a bearing case 12, and rotates in a fixed direction.

The rotating shaft 6 has a mechanism that operates in the vertical direction in order to lower the cutting position 3 of the product with moil held by the chuck 5 to the position of the burner port 8 of the burner 7. As shown in FIG. 5, the burners 7 and 9 have about 60 to 100 small flame ports arranged radially, and have an inner diameter slightly larger than the outer diameter of the cutting position of the product to be cut. These ring-shaped burners are arranged in two vertically separated stages at regular intervals. The appropriate distance between the two burners is about 1.5 to 3 inches, and this distance has an optimum dimension depending on the thickness of the glass of the cut portion of the product. - For example, in the case of a product with a thickness of about 1°5m, the optimum value is about 2ff11.

Next, as shown in FIG. 2, the cutting position 3 of the product with moil gripped by the chuck 5 is lowered to the flame port 8 of the burner 7 arranged in the upper stage, and the burner 7 Heating of the glass begins. At this time, the burner 9 arranged at the lower stage is stopped. The product 1 inserted into the burner is heated while rotating at a constant speed with respect to the flame opening, thereby achieving uniform heating all around the cutting position.

After the heating starts, the heated glass at the cutting position 3 softens, and the glass at this part starts to extend downward due to the weight of the moil part 2. This elongation is caused by the moil receiving plate 14 located below the burner 7.8, as shown in FIG.
This dimension can be freely selected depending on the position of , but there is an optimum dimension for this dimension depending on the thickness of the glass at the cutting position 3. For example, if the glass thickness at cutting position 3 is about 1.5 m,
Cabinet is the best choice.

In the conventional burn-off method, heating is continued with a burner in the state shown in FIG. The joke burner 7 is stopped at the timing before and after the contact, and at the same time, combustion is started in the lower burner 9, and the lower burner heats the area 1.5 to 3 meters below. 1.5 to 3 seconds after heating by the lower burner 9 is started, the moil receiving plate 14 is moved downward, the heated portion of the glass is further stretched, and the burner frame of the burner 9 burns off this portion.

When using the conventional burn-off method, the cut end surface 3 immediately after cutting
a has the shape shown in FIG. 9, and then immediately becomes the rounded shape shown in FIG. 10 due to the surface tension of the glass itself, which has been softened to a molten state at the cut end surface 3a. The glass is in a position exposed to the flame of the burner and is still heated after cutting, resulting in the formation of large beads as shown in FIG. 7 due to the increasing amount of glass softening to a molten state.

When cutting by the method of the present invention, the beads formed due to the above-mentioned reasons are so small that they are hardly visible to the naked eye, making it possible to obtain a product with almost the same excellent appearance as when cutting by the cranking method. did it.

(Effects of the Invention) As is clear from the above, the method of the present invention can solve the bead problem, which was difficult to solve with the conventional burn-off method, using a process and equipment that are not significantly different from those of the conventional burn-off method. Ta. In other words, the beads formed on the product of the present invention were so small that they were hardly visible to the naked eye and had an excellent appearance. In addition, the cutting cost was significantly lower than that of the conventional burn-off method and the cranking method.

[Brief explanation of the drawing]

FIGS. 1 to 4 are partially vertical schematic front views of the apparatus of the present invention in which a glass container base with moil is held by suction, and FIG. 6 is a longitudinal cross-sectional view of a glass container with moil attached, FIG. 7 is a longitudinal cross-sectional view of a glass container formed by the conventional burn-off method, and FIG. 8 is a cross-sectional view of a glass container according to the present invention. 9 is a longitudinal sectional view of the cut end surface immediately after cutting by the conventional burn-off method. FIG. FIG. 11 is a longitudinal sectional view of the cut end surface immediately after cutting by the method of the present invention, the first
FIG. 2 is a longitudinal sectional view of the cut end surface which has become rounded due to surface tension from the state shown in FIG. 11. DESCRIPTION OF SYMBOLS 1...Product part, 2...Moil part, 3...Cutting position, 3a...Cut end surface, 4...Bead, 5...
Chuck, 6... Rotating shaft, 7... Upper burner, 8
...Upper burner outlet, 8a...Upper burner outlet position, 9...Lower burner, 10...Lower burner outlet, 10a...Lower burner outlet position, 11...
Bearing, 12...Bearing case, 13...
Vacuum hole, 14...Moil receiving plate. Figure 1 Patent Applicant Toyo Glass Co., Ltd. Agent Patent Attorney Kiyodo Kobe Kobe Shin Figure Figure 5 Figure 6 Figure 8 Figure 7 Figure a Figure 11: 510 Figure 12 figure

Claims (2)

[Claims] (1) In the method of heating and cutting the unnecessary mouth part of a hollow glass container with a ring-shaped burner, the initial stage of heating the cut part Burn the upper burner,
After the glass in this area is heated, softens and begins to stretch,
A method for producing a hollow glass container characterized by stopping the upper burner, simultaneously starting combustion in the lower burner, and burning out this part with the lower burner. (2) A device for holding a glass container so that it can move vertically and rotatably with the unnecessary portion of the mouth facing down, and a ring-shaped burner that is provided below the device and separated into upper and lower stages at regular intervals. , an apparatus for manufacturing a hollow glass container, characterized by comprising a device for switching combustion between upper and lower burners, and a moil receiving plate that is movable up and down below these burners.