JPH05345B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Objective of the invention>><<Industrial application field>> The present invention relates to improvements in a method and apparatus for manufacturing hollow glass containers such as pots by blow molding.

《Prior art》 Hollow glass containers such as pots that are generally molded by blow molding have a moil portion 2 which is an unnecessary part of the opening as shown in Fig. 10 due to necessity in the molding process. This is cut and removed during the process to create a finished product.

The method for removing the moil portion 2 includes making fine scratches on the glass surface along the cutting position 3 between the product portion 1 and the moil portion 2 using a diamond wheel, etc., and then applying a thermal shock to this portion using a burner or the like. There is a method called the general cracking method in which the material is cut, and a method called the burn-off method in which the cutting position 3 is heated with a burner and burnt out with a burner flame, and both of these methods 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. There is a need. 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 carbide material at a constant pressure against the glass surface at the cutting position, and then the cut end surface 3a of the product is roughened. It is essential to perform a process of polishing and then applying a glossy finish by surface melting using a burner or the like, or by buffing or the like.

Moreover, the above method is possible when the cross section of the glass at the cutting position is circular or close to circular, and is possible when the cross section of the glass at the cutting position is circular or close to circular.
If the shape is a rectangle or other shape that deviates significantly from a circle, in order to make uniform scratches on the product surface along the cutting position, use a wheel made of carbide material to match the cross-sectional shape of the product surface and apply constant pressure. Moreover, it requires an extremely complicated operation in which the glass surface is pressed at a constant angle and moved at a constant speed. In addition, when heating the product with a burner to apply thermal shock after scratching the surface of the product, it is necessary to move the burner to match the cross-sectional shape of the glass at the cutting position. The equipment is extremely complex and expensive, and
If done manually, great skill is required. For these reasons, it has been extremely difficult to cut and remove the moil portion of a product whose cross section at the cutting location is non-circular using the conventional cracking method. In addition, FIG. 15 and FIG. 16 show the shape of the cut position cross section of the product with moil, and in the present invention, show an example of a shape that can be regarded as circular in some cases.

According to the cracking method, excellent products can be obtained, but as this method requires many cutting steps, the cutting cost is relatively high, and as mentioned above, the cutting cost is relatively high. , it was almost impossible to apply depending on the shape of the product.

In the burn-off method, a product with hot moil immediately after molding can be directly transferred to the cutting process, and 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 cracking method. However, in the conventional burn-off method, when the glass at the cutting position 3 is heated by a burner, softened to a molten state, and burnt off by the burner flame, a thick portion, a bead 4, as shown in FIG. is formed. The bead 4 is formed by the surface tension of the glass itself, which is softened to a molten state at the cutting position 3 at the same time as the cut portion is burnt off by the burner flame, and this portion continues to be heated by the burner flame after cutting. It gets even bigger. Cut end surface 3a immediately after cutting
The bead 4 can be kept small to some extent by moving the bead 4 away from the burner frame or turning off the burner, but the time from the start of heating to cutting may vary due to the glass thickness at the cutting position 3, temperature, etc. In addition, the burn-off equipment in the actual process is equipped with multiple burners, about 30 to 36, and each burner has a different combustion state, so the above operations are performed according to the cutting time of each burner. That is difficult. This bead 4 is one of the defects that impairs the appearance of the finished product, but it has been a problem that is difficult to solve with the conventional burn-off method for the above-mentioned reasons.

Furthermore, in the burn-off method, if the cross section of the glass at the cutting position is elliptical or rectangular, which deviates significantly from the circular shape, the distance from the burner flame mouth to the glass surface at the cutting position varies depending on each part of the circumference of the cutting position, and therefore the heating This causes a large difference in glass temperature at various parts of the circumference of the cutting position, and some parts are burnt off by the burner flame after being heated and softened, while others are not burnt out due to insufficient heating, making it almost impossible to make a good cut. It was possible.

In recent years, there has been a strong trend in the market to demand bead-free products, and according to the cracking law, the 12th
Although it is possible to obtain a product with an excellent appearance without beads like the product of the present invention shown in the figure, there is a problem that the cutting cost by this method is higher than that by the burn-off method as described above, and the glass at the cutting position is As mentioned above, it has been extremely difficult to apply this method to products with a non-circular cross-sectional shape.

<<Structure of the Invention>><<Means for Solving the Problems>> The present invention can be manufactured at low cost like the above-mentioned conventional burn-off method and, like the cracking method, can obtain a product with an excellent appearance without beads. . The method of the present invention heats and softens the glass at the cutting position using a ring-shaped burner, which is similar to the conventional burn-off method, but whereas the burn-off method burns it off with a burner flame, in the present invention, the glass is heated and softened at the cutting position. It is characterized by stretching the glass at the cutting position to make it thinner before cutting, and then separating the moil part and the product part with an impact and cutting.

That is, in the method of the present invention, when cutting and removing unnecessary portions of the mouth of a hollow glass container formed by a blow molding method, the glass of the cut portion is heated and softened using a burner with flame openings arranged in a shape similar to the cross-sectional shape of the glass. The present invention relates to a method for manufacturing a hollow glass container, in which the unnecessary opening part is cut and removed by stretching the container thinly and then separating the unnecessary opening part and the product part with an impact.

Furthermore, in the method of the present invention, for a hollow glass container with a circular or ring-shaped cross-sectional shape, the container is held with its mouth unnecessary portion facing down, and while being rotated, the cut portion of the glass is placed in a circular or ring-shaped burner. It is characterized by stretching it thinly by heating and softening it, and then shockingly separating the product part and the unnecessary part of the mouth.For hollow glass containers whose cut part has a non-circular cross-sectional shape, this is used to separate the unnecessary part of the mouth. Hold it face down, and while it is not rotating, heat and soften it with a burner with flame ports arranged in a shape similar to the cross-sectional shape of the part, stretch it thinly, and impact the product part and the unnecessary part of the mouth. It is characterized by separating from each other.

Furthermore, when the glass at the cutting position is softened by the heating of the burner, it is stretched thinly by the weight of the moil portion, but the glass slightly below the cutting position is the thinnest. , just before cutting, set the heating position to 1, for example.
It is characterized by moving it slightly downward by about mm, and then instantaneously heating it for about 1 to 2 seconds, and then shockingly separating the product part and the unnecessary part of the mouth part.

The device of the present invention includes a device that holds a glass container vertically and rotatably as necessary with the unnecessary portion of the mouth facing down, and a device that raises the glass container with an impact.
The present invention is characterized by comprising a burner provided below the device for holding the glass container and a moil receiving plate further provided below the burner.

<<Operation>> In the method of the present invention, before cutting, the glass at the cutting position is made thinner to the limit that cannot be burnt out by the burner flame, and the glass immediately before cutting becomes even thinner by the action of separating the moil portion and the product portion. Therefore, the bead formed by the molten glass on the cut end surface immediately after cutting becomes extremely small. Furthermore, if the action of separating the moil part and the product part is performed by rapidly raising the product part, the cut end surface will separate from the burner frame at the same time as cutting, and it is possible to avoid the bead from becoming large due to the burner frame after cutting. Also,
According to the method of the present invention, the disadvantage of beads can be eliminated compared to the process of the conventional burn-off method by making slight process changes and adding simple equipment, and the device of the present invention can eliminate the disadvantage of beads in the process of the conventional burn-off method. By raising the burner, the burner is quickly removed from the cutting position, so bead growth can be reliably suppressed.

<<Example 1>> This example relates to a product with moil having a circular or ring-shaped cross section at the cutting position. Figure 1 is a schematic front view of the device of the present invention, in which a product with moil is suctioned and held, and Figures 2 and 3 are its right side view and A.
-A sectional view. As shown in these figures, the molded product with moil is first inserted into a vacuum suction chuck 5 having a vacuum hole 16, and the moil portion 2 is gripped downward. The chuck 5 is attached to a rotating shaft 6 via a bearing 9 and rotates in a fixed direction. The rotating shaft 6 has a mechanism that operates in the vertical direction to lower the cutting position 3 of the product with moil held by the chuck 5 to the position of the flame opening 8 of the burner 7. Further, a cam follower holder 10 is attached to the rotating shaft 6 via a bearing 9, and a cam follower 11 is attached to this. The cam follower holder 10 has a structure in which it does not rotate together with the rotating shaft 6 due to the guide rod 12.

Next, as shown in FIG. 4, the cutting position 3 of the product with moil held in the chuck 5 is lowered to the flame opening 8 of the ring-shaped burner 7, and the glass at the cutting position 3 is heated by the burner 7. Begins.

A ring-shaped burner usually has about 60 to 100 small flame ports arranged radially inside the ring, and has an inner diameter slightly larger than the outer diameter of the product to be cut at the cutting position. By heating the product while rotating it at a constant speed with respect to the flame port, uniform heating of the entire circumference of the cutting position of the product is achieved.

After the heating starts, the heated glass at the cutting position 3 is softened, and the glass at this part becomes the moil part 2.
It begins to grow downward due to its own weight. As shown in FIG.
continues until they touch, after which this elongation stops.
The glass elongation dimension Y at cutting position 3 is moil receiving plate 1
Although this dimension can be freely selected depending on the position 3, there is an optimum dimension for this dimension depending on the thickness of the glass at the cutting position 3. As an example, the glass thickness at cutting position 3 is 1.5
If the diameter is around mm, 10 to 12 mm is optimal. When the glass at the cutting position 3 is extended until the tip 2a of the moil portion 2 touches the moil receiving plate 13 and held in that state, it is usually burned off by the burner flame after 2.5 to 3.5 seconds. Therefore, the tip of the moil part 2
1.5 to 2 seconds after a comes into contact with the moil receiving plate 13, the air cylinder 14 operates the cam in the horizontal direction, the glass container is raised impulsively, and the product part 1 and the moil part 2 are impulsively separated and cut. do. In this embodiment, the cam 15 has two slopes 15a and 15b as shown. Immediately after the tip 2a of the moil portion 2 extends until it comes into contact with the moil receiving plate 13, the air cylinder 14 is operated to operate the cam 15 in the horizontal direction.
The chuck 5, rotating shaft 6, etc. are lifted by 1 mm, for example. This causes the glass container to rise as well.
The flame opening of burner 7 is placed at the thinnest part of the glass at position 3', 1 mm below cutting position 3.
Heat for about seconds. At this point, as shown in FIG. 6, the cam 15 is further actuated to cause the cam follower 11 to ride on the cam slope 15b, and the product part 1 and the moil part 2 are separated and cut by impact.

Immediately after cutting, the cut end surface 3a has the shape shown in FIG. 7, but the surface tension of the glass itself, which has been softened to a molten state at the cut end surface 3a, immediately creates a rounded and smooth surface as shown in FIG. 8. It will have the following. If there is a large amount of glass softened to a molten state on the cut end surface 3a immediately after cutting, the bead formed by the surface tension will be large, but according to the present invention, the bead formed by the glass softened to a molten state can be cut. Since the cut end surface 3a immediately after is extremely thin, the bead formed is so small that it is hardly visible. Further, at the same time as cutting, the product portion 1 is lifted upward, and its cut end surface 3a is separated from the burner frame.
This prevents the bead from becoming large due to the burner frame.

It is inevitable that glass containers formed by blow molding will have some variation in glass thickness, temperature, etc. for each product, and when cutting using the conventional burn-off method, these variations cause problems from the start of heating to cutting. The time was not constant, and there was considerable variation in the size of the beads. However, in this example, despite these variations between products, almost the same good bead-free cut end surface could be obtained at the same timing set in the apparatus.

《Example 2》 In this example, the moil portion of a moil accessory whose glass cross section at the cutting position is oval was cut and removed using the same device as in the example except that a burner with a different arrangement of burner ports was used. I did this. The process is almost the same as Example 1, so the drawings are from Example 1.
Refer to the drawings related to the process. In this embodiment, instead of the conventional ring-shaped burner, as shown in FIG. 9, a burner 17 is used in which flame ports 18 are arranged in a shape similar to the cross-sectional shape of the cutting position of the product and slightly larger than the cross-section of the product. was used. Further, the shape of the cam 15 is also different from that in Example 1, and has a single-step slope without the slope 15a.

Therefore, when heating the cutting position of the product, the product was not rotated, but the cutting position was inserted to the burner flame opening position so that its cross-sectional shape followed the array shape of the flame openings of the burner, and the cutting position was heated. After heating and softening the glass at the cutting position, stretching this part to make it thinner and continuing to heat it, it is possible to burn it off with a burner, but before it burns out, activate the cam to separate the moil part and the product part. It was severed by shockingly pulling it apart.

When heating the cutting position using the conventional burn-off method, there is some variation in the strength of the flame that comes out from each burner's flame opening even if it is heated with a burner whose flame opening is arranged in a similar cross-sectional shape to the cutting position. is unavoidable. Therefore, the temperature of the glass at the cutting position to be heated varies depending on the circumferential portion thereof. The effect is that the entire circumference of the cutting position is not cut at the same time, and some parts are cut earlier and others are cut later.The part cut earlier continues to be heated by the burner flame even after cutting, and the bead in this part The size of the bead is different from that of the part that grows and is cut off later. The difference in the size of the beads from part to part significantly impairs the appearance of the product.

In this example, after heating and softening the glass at the cutting position in the same manner as in Example 1, the moil portion and the product portion are lifted upward.
Even though the glass temperature at the cutting position varies to some extent in the circumferential direction, the entire circumference of the cutting position can be cut at the same time, and the cut end surface of the product is lifted upward at the same time as the burner frame. Due to the greater separation, bead growth due to the burner flame after cutting was avoided.

In order to simultaneously cut the entire circumference of the cutting position, after the tip 2a of the moil portion is in contact with the moil receiving plate 13, a cam (in this example, the slope is one step, and the slope is slightly below the cutting position immediately before cutting) is required. (No slope is provided to slightly lift the product in order to heat the part.) Therefore, it is necessary to select the optimum heating time required until the action of lifting the product part 1 is applied. This time is not constant depending on the thickness of the glass at the cutting position, the strength of the burner frame, etc., but in this example, when the glass thickness at the cutting position is 1.5 to 2.0 mm, 2 to 4 seconds is appropriate. It was hot. There is a slight variation in the strength of the burner frame depending on the flame opening of each burner, so it is inevitable that the temperature of the glass at the cutting position will also vary accordingly. As a result, if the above heating time is shorter than the appropriate range, there will be an undercooked area, which is the product part 1 and the moil part 2.
It will not be cut even if an impactful action is applied to it. In addition, if this heating time is longer than the appropriate range, only the part heated by the strong burner flame will be burned off before the action of shockingly separating the product part 1 and the moil part 2, and in any case However, it is not possible to cut the entire circumference of the cutting position at the same time. In other words, by selecting an appropriate length of time from when the tip 2a of the moil portion comes into contact with the moil receiving plate 13 to when the action of shockingly separating the product portion 1 and the moil portion 2 is applied, the entire circumference of the cutting position can be cut at the same time. It is possible to do so. Therefore, in the present invention, it is necessary to select an appropriate heating time by some trial and error depending on the shape of the product, the thickness of the glass, etc.

The product completed in this example has an excellent appearance because the bead formed on the cut end surface is uniform all around and extremely small, and the cutting position was difficult to achieve with conventional cracking and burn-off methods. We succeeded in cutting and removing the moil portion of a product with moil that has a non-circular cross-sectional shape.

<<Effects of the Invention>> As is clear from the above, the cutting method of the present invention eliminates the drawback of beads, which was difficult to solve with the conventional burn-off method, in a process that is not significantly different from the conventional burn-off method. As with the conventional burn-off method, the cutting cost can be significantly lower than that of the cracking method.

Furthermore, it has become possible to obtain products of extremely high quality even for products in which the shape of the glass at the cutting position is not ring-shaped.

[Brief explanation of the drawing]

Figures 1 to 6 are for explaining an embodiment of the apparatus of the present invention and the steps of the method of the present invention, and Figure 1 is a partially longitudinally sectioned approximately front view of the apparatus of the present invention holding a glass container with moil by suction. Figure 2 is a partially vertical schematic right side view, and Figure 3 is A-A of Figure 1.
A line sectional view, FIG. 4 is a schematic front view showing the state immediately before heating, FIG. 5 is a schematic front view similarly showing the state immediately before cutting, FIG. 6 is a schematic front view similarly showing the state immediately after cutting, and FIG. The figure is a schematic longitudinal cross-sectional view showing the cut end surface immediately after cutting by the method of the present invention, FIG. 8 is a schematic longitudinal cross-sectional view showing the cut end surface finally formed after cutting, and FIG. 9 is a schematic longitudinal cross-sectional view showing the cut end surface finally formed after cutting. A partially cutaway top view of a burner with a spout, FIG. 10 is a vertical cross-sectional view of a glass container with moil, FIG. 11 is a vertical cross-sectional view of a glass container made by the conventional burn-off method, and FIG. 12 is a glass container according to the present invention. Figures 13 and 14 are examples of the cross-sectional shape of a product with moil at the cutting position, and are examples of shapes that deviate greatly from a circle. Figures 15 and 16 are the cross-sectional shapes of the product with moil at the cutting position. This is an example of a shape that can sometimes be considered circular. DESCRIPTION OF SYMBOLS 1...Product part, 2...Moil part, 3...Cutting position, 3a...Cut end surface, 4...Bead, 5...
...chuck, 6... rotating shaft, 7... burner, 8...
... Burner flame opening, 9 ... Bearing, 10 ... Cam follower holder, 11 ... Cam follower, 12 ... Guide rod, 13 ... Moil receiving plate,
14...Air cylinder, 15...Cam, 16...
... Vacuum hole, 17 ... Burner, 18 ... Burner mouth, 19 ... Cutting position cross section of product with moil.

[Claims]

1 Place the high-temperature stable fibers forming the hollow composite article preform into the mold cavity, heat the billet of high-temperature stable glass matrix material above its melting point, and place the heat-plasticized matrix material into the mold cavity. a fiber-reinforced glass matrix composite material, which is pressurized and transferred into and around the fibers so as to contain the fibers arranged in the fiber-reinforced matrix material, and cools the fiber-reinforced matrix material to form a hollow composite article. In the forming method, the matrix material is applied inside the preform of the hollow article;
and injecting the glass matrix into the hollow article preform from at least one point approximately in the middle of the longitudinal axis of the blow molded article, thereby improving the dimensional accuracy of the molded finished product and minimizing distortion of the article preform. Characteristic molding method for fiber-reinforced glass matrix composite materials. 2. The fiber-reinforced glass matrix composite material according to claim 1, wherein the fibers are braided fibers, non-braided fibers, continuous fibers, discontinuous fibers, or a combination thereof. molding method.

Claims (1)

Claim 3: After stretching this thinly, the heating position is moved slightly downward, and after further instantaneous heating, the product part and the unnecessary mouth part are separated by impact.
Method 6 for producing a hollow glass container as described: A device for holding a glass container vertically and rotatably as necessary with the unnecessary portion of the mouth facing down; a device for shockingly raising the glass container; and a device for holding the above-mentioned glass container. 1. An apparatus for manufacturing hollow glass containers, comprising: a burner provided below the apparatus; and a moil receiving plate further below the burner.