JPS5910936B2 - Glass bottle manufacturing method and mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a glass bottle and a mold used for manufacturing the same, and more particularly to a method and mold for manufacturing a glass bottle that can prevent the occurrence of cracks in the neck.

Glass bottles are usually manufactured by ■S machine (e.g., Asakura Shoten, Glass Handbook No. 424-42, published September 30, 1975).
A molten glass gob is produced by blowing or pressing using a rough mold (as described on page 5).
After forming a parison, the parison is transferred to a finishing mold and blow molded.

In FIGS. 1 and 2 for explaining an example of parison molding using the blow one method, 1 is a rough mold (consisting of a pair of half-split molds 1a, see FIG. 3), and 2 is a mouth mold. 3 is a plunger.

Figure 1 shows a molten glass gob 5 passing through a funnel 4 into a rough mold 1.
This figure shows the state in which the half molds 1a of the rough mold 1 are about to be charged into the holder 6 so that they are in close contact with each other.
(see Fig. 4), and the head 3a of the plunger 3 is pressed in the radial direction by the screw forming part 2 of the mouth mold 2.
It is located within a.

After the molten glass gob 5 has finished falling, the plunger head 3
When contacting point a, the baffle 7 (see FIG. 2) is attached to the upper part of the rough mold 1 so that its lower end circumferential surface 7a engages with the opening periphery 4a of the funnel 4 (not shown).

Then, compressed air is introduced into the rough mold 1 through the guide hole 7b, and the molten glass gob 5 is delivered to the inner circumferential surface 1e of the roughly lower half of the rough mold 1.
It comes into close contact with the inner surface of the single-mouth thread forming part 2a and the outer surface of the plunger head 3a.

The funnel 4 is then removed and as shown in FIG.
Batsuful γ is attached directly to the upper part of the rough mold 1, the plunger 3 is lowered, compressed air is charged in the direction of the arrow through the guide hole 3b of the plunger 3 (i.e. counter-blown), and the parison is 8 is formed.

Next, the buttful 7 is removed, the rough mold 1 consisting of the half-split mold 1a is opened by the holder 6, and the parison 8 is formed into a finished mold (see FIG. 20).

As shown in FIG. 3, a ring-shaped protrusion 1b is provided along the upper outer periphery of the half mold 1a, and a recess 1c is formed inside the lower end of the protrusion 1b.

The recess 1c engages with the upper protrusion 6a of the holder 6.

As shown in FIG. 4, the polder 6 consists of a pair of holder pieces 6b corresponding to each half mold 1a.
is hinged to a vertical shaft 9, and the rough mold 1 is configured to be opened in a hinged manner by the holder 6 by moving a pin 10 in the direction of the arrow by a drive mechanism (not shown).

The conventional rough mold 1 and mouth mold 2 are usually entirely made of metal, most preferably cast iron.

As shown in FIG. 5a, when the rough mold 1 is closed, the opposing surface 1d of the rough mold 1 is in metal-to-metal contact with the horizontal peripheral portion 2c of the upper surface of the mouth mold 2.

Therefore, as shown in FIG. 5b, the rough mold 1 is
At the stage of opening, the sliding property between the surface 2c and the surface 1d is poor, causing so-called stick-slip, and the resulting impact causes damage to the area around the outer surface 8a' of the base of the neck 8a of the parison 8 (rough shape). Microcracks (corresponding to the position where the inner surface of mold 1 and the inner surface of mouth mold 2 are adjacent)
occurs.

This burr remains in the finished mold and on the bottle after blow molding, causing defective bottles.

Conventionally, in order to prevent such defects, oil was often applied between the upper surface of the mouth mold 2 and the rough mold 1 (for example, a lubricant containing powdered graphite dispersed in an oily liquid) was applied.

This causes problems such as a reduction in production efficiency due to contamination of the product and the need for workers to apply oil, and it is difficult to completely eliminate chattering defects.

The present invention aims to solve the problems of the prior art described above.

In order to achieve the above object, the present invention uses a parison molding die equipped with a rough mold and a mouth mold each having horizontal surfaces in contact with each other to form a parison from a molten glass gob when the rice mold is closed. A method for manufacturing a glass bottle by molding a glass bottle, opening the rough mold, transferring the parison supported by the mouth mold from the rough mold to a finishing mold, and blow-molding the parison in the finishing mold, the method comprising: The horizontal surface of the prototype mold that contacts the mouth mold is formed by a carbon plate, and when the rough mold is opened, the carbon plate slides along the horizontal surface of the mouth mold. The present invention provides a method for manufacturing characteristic glass bottles.

Furthermore, the present invention provides a parison mold for manufacturing glass bottles that includes a rough mold and a mouth mold, in which the horizontal surface of the rough mold that contacts the horizontal periphery of the upper surface of the mouth mold is formed by a carbon plate. A parison molding tool for manufacturing glass bottles, characterized in that a portion of the upper surface of the mouth mold inside the peripheral portion faces the metal surface of the rough mold with a slight gap. It provides a model.

The present invention will be described below with reference to the drawings which are examples.

In FIG. 6, 11 has the shape shown in FIGS. 7 and 8.
In other words, it is a half-ring-shaped carbon plate (herein referred to as carbon plate including graphite plate), and the lower surface 11a of the protruding portion is formed by the rough mold 1.
is horizontal in the closed state and is in contact with the horizontal upper surface peripheral portion 2c of the mouth mold 2.

The carbon plate 11 is fixed to the rough mold 1 by bolts (not shown) (made of stainless steel, for example) that pass through bolt holes 11b.

If the taper part 11c and the chamfered part lid have sharp corners, the corners are likely to be damaged, and as a result, fine fragments may get stuck in the gap between the rough mold 1 and the mouth mold 2, causing an obstruction to opening and closing of the rough mold. It was designed to prevent this from happening.

The inner surface 11e of the carbon plate is the inner surface 1e of the rough mold 1.
The inner surface 1e of the rough mold 1 is entirely formed of cast iron, without extending to the same extent.

When the molten glass comes into direct contact with the carbon plate, the cooling rate of the molten glass surface in the contact area is slower than that of other parts of the surface, which may cause problems such as deformation of the parison or sharp corners in the part corresponding to the corner 1f. This is because the core part is exposed and the core part becomes easily damaged, which causes damage.

The inner part 2d of the upper surface of the mouth mold than the peripheral part 2c, and the surface 2d
A slight gap (preferably about 0.01 to 0.13 mm) is provided between the opposing surface 1g of the rough mold 1.

When surface 2d and surface 1g are in contact, due to metal-to-metal contact,
This is because there is a risk that stick-slip may occur when the rough mold 1 is opened, resulting in burrs at the neck of the parison as described above.

The gap is determined to be large enough to prevent molten glass from flowing into the gap and causing beams.

Carbon has a small coefficient of friction and is heat resistant, so by providing the carbon plate 11 as described above, stick and slip when opening the rough mold 1 can be prevented. Stable work can be performed without deterioration even after long-term use.

To give a specific example, when molding a parison for a drink bottle (weighing 145g), a conventional rough mold (made of cast iron) without a carbon plate takes 5 days (24 hours a day).
During continuous operation, an average of 0,536 warping parisons were produced per hour even if oil was applied at appropriate times.

However, in the crude mold of the present invention equipped with a carbon plate, not a single bottle with vibration occurred during the entire period.

The above description has been about the parison mold using the blow method, but the parison mold using the press method is also applicable.
Needless to say, installing a carbon plate has the same effect.

By using carbon material in other parts of the glass bottle mold than those mentioned above, various problems associated with conventional bottle molding can be solved.

9, 10 and 11 show a funnel 4' placed on a rough mold for forming a parison for flat bottles.

Since the rough mold in this case has a flat cavity, it is necessary to deform the molten glass gob 5', which has a substantially circular cross section, into a flat shape as it slowly falls by gravity within the funnel 4'.

When the parison 8 has a circular cross section as in the case of Fig. 1, the gob 5 normally only needs to pass through the funnel 4 without contacting it, but in the case of a coarse parison for a flat parison, the cross section This is because if the gob remains circular, it gets stuck in the rough mold and is difficult to be charged into the cavity.

Therefore, the hole 16 of the funnel 4 is formed into a flat shape with a long side surface 16a tapered upward.

Therefore, the portion 5'a of the molten glass gob that has passed through the hole 16 is deformed into a flat shape according to the shape of the hole 16.

By forming this long side surface 16a with a guide piece 1T made of carbon, the molten glass gob 5' can pass through and deform smoothly.

Conventionally, the entire funnel including the long side surface 16a was made of cast iron.

Therefore, as the working time progresses, especially when the molten glass gob 5'
The temperature of the long side surface 16a, which has a high contact pressure with the gob 5', increases, resulting in overcooking, worsening the slipperiness with the gob 5', prolonging the gob charging time, and causing the gob charging timing to be incorrect. Alternatively, there is a problem that the gob stretches more than necessary, and when it enters the rough mold, it bends and wrinkles occur, and in order to prevent this, it is necessary to frequently apply oil to the hole 16. was there.

By employing the guide piece 17 made of carbon, it is possible to achieve the effect that the above-mentioned trouble does not occur even if continuous work is performed for a long time without applying oil.

Upper edge 20 of the cavity inner peripheral surface of the finishing mold 20 in FIG.
As shown in FIGS. 13 and 14, a is formed by a half-ring-shaped carbon plate 21.

22 is a bolt hole, and the carbon plate 21 is fixed to the upper part of the main body of the finishing mold 20 by a bolt (not shown).

The carbon plate 21 and the shallow groove 23 on the upper surface of the finishing mold 20 are formed for mounting a blow head (not shown).

Conventionally, the entire finishing die 20, including the upper edge 20a, was made of cast iron.

Therefore, the mold releasability of the blow-molded glass bottle 24 and the upper edge 20a made of cast iron is poor, and the pair of half-split molds 20b
When opening the finishing mold 20, the outer surface 24a of the neck of the glass bottle 24 stuck to one of the half molds 20b, causing the glass bottle 24 to fall down.

In order to prevent this, it was necessary to frequently apply oil to the upper edge 20a, but by installing the carbon plate 21, the above-mentioned accident of falling sideways can be prevented even if the work is continued for a long time without applying oil. be able to.

Furthermore, since there is no need to apply oil, the glass bottle 24, which is the product, is no longer stained.

In the mold shown in FIG. 12, the surface 25a of the bottom mold 25 that contacts the horizontal bottom surface 20c of the finishing mold 20 is
The carbon plate 26 is formed by a half-ring-shaped carbon plate 26 as shown in FIG.
is fixed to.

Conventionally, the entire bottom mold 25 was made of cast iron. As a result, the sliding properties between the finishing mold 20 and the bottom mold 25 are poor, and when the finishing mold 20 is opened, the impact caused by the stick-slip phenomenon may cause the outside of the shoulder 24b of the glass bottle 24 (particularly the shoulder 24 to be stretched). In the case of bottles, because the draft angle was small, cracks were likely to occur.

By installing the carbon plate 26 with excellent lubricity, the above-mentioned trouble can be prevented.

According to the present invention, the surface of the prototype mold that comes into contact with the horizontal upper surface of the mouth mold is formed of a carbon plate with excellent lubricity and heat resistance, so there is no stick-slip when opening the rough mold. Since the balisong can be opened smoothly, it can be used continuously for a long period of time without oiling, without causing any cracks in the neck of the balisong.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views of an example of a parison mold using a conventional rough mold, in which FIG. 1 shows a state in which a molten glass gob is charged, and FIG. The figure shows the state after counter blow molding of the original mold is completed, Figure 3 is a perspective view of the rough mold, Figure 4 is a perspective view of the rough mold holder, and Figure 5 a shows the state of the original mold after counter blow molding is completed. Fig. 5b is a longitudinal sectional view of the main part showing the state in which the blow molding of the parison is completed, Fig. 5b is a longitudinal sectional view of the main part at a stage in the middle of opening the rough mold of Fig. 5a, and Fig. 6 is the parison molding of the present invention. An enlarged vertical cross-sectional view of the main part of one embodiment of the mold, FIG. 7 is a bottom view of the carbon plate seen from the v■1■ line in FIG. 6,
Figure 8 is a vertical cross-sectional view taken along the line Vll-■ in Figure 7, Figure 9 is a plan view of an example of a funnel, and Figure 10 is a
11 is a bottom view of the funnel in FIG. 9, FIG. 12 is a longitudinal sectional view of an example of the finishing mold, and FIG. 13 is a plan view of the carbon plate used in FIG. 12. , FIG. 14 is a longitudinal sectional view taken along the line XIV-XIV in FIG. 13,
Fig. 15 is a plan view of the carbon plate seen from line xv-xv in Fig. 12, and Fig. 16 is a plan view of the carbon plate seen from line xv-xv in Fig. 15.
FIG. 3 is a vertical cross-sectional view taken along line IV. 1... Rough type, 2... Mouth type, 2c...
... Horizontal periphery of the upper surface of the mouth mold, 2d ... Part inside the periphery of the upper surface of the mouth mold, 5 ... Molten glass gob, 8 ... Parison , 11...
・Carbon plate, 25...Glass bottle.

Claims (1)

[Claims] 1. With the rough mold in a closed state, a parison mold is formed from a molten glass gob using a parison molding die equipped with a rough mold and a mouth mold each having horizontal surfaces that contact each other. , in a method of manufacturing a glass bottle by transferring the parison supported by the mouth mold from the rough mold to a finishing mold using the rough mold, and blow-molding the parison in the finishing mold, the prototype mold is A glass bottle characterized in that the horizontal surface in contact with the core mold is formed of a carbon plate, and when the rough mold is opened, the carbon plate slides along the horizontal surface of the mouth mold. manufacturing method. 2. In a parison mold for manufacturing glass bottles, which is equipped with a rough mold and a mouth mold, the horizontal surface of the rough mold that contacts the horizontal periphery of the upper surface of the mouth mold is formed of a carbon plate. A parison mold for manufacturing a glass bottle, characterized in that a portion of the upper surface of the mouth mold inside the peripheral portion faces the metal surface of the rough mold with a slight gap.