JP4786733B2 - Guide rings and glass bottles - Google Patents

Description

  The present invention is a part of a glass bottle molding facility, and is attached to a mouth mold for molding the mouth of a parison and a glass bottle, and a guide ring for molding the vicinity of the top of the mouth of the parison and the glass bottle, and this The present invention relates to a glass bottle formed using a guide ring.

  With reference to FIGS. 15 and 16, an outline of a process for forming a glass bottle by a conventional blow and blow method will be described. 15A to 15C, the parison P as a semi-finished product is manufactured from the gob G (a lump of molten glass) using the rough mold 20. In FIG. 15A, the gob G is put into the rough mold 20, and in FIG. 15B, it is pressurized with compressed air from above through the baffle 22 (settle blow), and the mouth mold 10 under the rough mold 20 is applied. Mouth is made with glass. At this time, the plunger 21 is set at a predetermined position. In FIG. 15C, the plunger 21 descends, air is blown into the cavity (counter blow), and the parison P is formed by the rough mold 20 and the upper baffle 22. FIG. 16 shows the device in an intermediate state between FIGS. 15B and 15C in some detail. In the figure, the plunger 21 is set at a predetermined position, and the baffle 22 is set on the upper portion of the rough mold 20. Thereafter, the plunger 21 descends and counter blow is performed. In FIG. 15D, the parison P is transferred to the finishing mold 23 using the mechanism 25 (reversing device). In this case, the rough mold 20 is opened in half, the parison P is inverted on the finishing mold 23, the mouth mold 10 provided at the tip of the mechanism 25 is opened in half, and the mouth mold is opened. 10 and the parison P held by the guide ring 1 is released into the finishing mold 23. 15E to 15F, a glass bottle B as a final product is formed (final blowing) in the finishing mold 23, and the glass bottle B is taken out from the finishing mold 23 in FIG. In this case, the finishing mold 23 is split into two on the bottom mold 24, and the glass bottle B on the bottom mold 24 is taken out.

The guide ring is disclosed in Patent Documents 1 and 2 below, for example.
FIG. 7 is a schematic longitudinal sectional view of these conventional guide rings, and FIG. 8 is an enlarged view of a main part of FIG.
The guide ring 1 has a substantially donut plate shape, and a molding surface 2 is formed on the inner peripheral side of the lower surface of the glass bottle to mold the top or side upper end of the glass bottle. Yes.
The molding surface 2 has a curved portion 3 for molding an R surface from the outer edge of the top surface of the glass bottle mouth portion to the upper end of the side surface. The curved portion 3 has an arc shape in the longitudinal section of the molding surface. The lower end 4 of the curved portion which is the lowermost end of the curved portion 3 is the lower end of the molding surface 2.

The guide ring 1 is attached to the mouth mold 10 as shown in FIG.
The mouth mold 10 has a generally donut shape and is divided into two parts. Reference numeral 13 is a split type joint.
A molding surface 11 for molding the outer peripheral surface of the bottle opening is formed on the lower inner periphery of the portion where the guide ring 1 is mounted. In the longitudinal section of the molding surface 11, the uppermost portion is a straight portion 12 that forms a face 8 (a surface having a straight longitudinal section) immediately below the R surface at the upper end of the bottle opening.

FIG. 10 is a side view of the mouth of a glass bottle B formed using the conventional guide ring of FIGS. 7 to 9, and FIG. 11 is an enlarged view of a portion E of FIG.
The uppermost part of the side surface of the mouth portion of the bottle B is an R surface 6 (surface having an arcuate longitudinal section) formed by the curved portion 3 of the molding surface 2 of the guide ring, and the lower side is a straight portion 12 of the mouth mold 10. The face 8 is formed (a surface having a straight longitudinal section). A parting line 9, which is the boundary between the guide ring 1 and the mouth mold 10, appears at the lower end 7 of the R surface.

JP 2005-324977 A JP 2001-328824 A

Conventionally, a step, a chip (so-called “mouth chip”), a crack (a so-called “mouth chip”) in the vicinity of the guide ring at the mouth portion of the glass bottle and the parting line 9 of the mouth mold, in particular, at the intersection of the mouth mold vertical parting lines 13 and 9. There was a problem that defects such as “billing” were likely to occur.
As shown in FIG. 13, the level difference occurs at the parting line between the R surface and the face. The cause of the step is that when the mouth mold opens (the process of FIG. 15 (d)), the bottle mouth is pulled by one of the split molds, and the glass tends to hit the lower end Q of the guide ring. This is due to wear. Since the vicinity of the lower end Q of the guide ring is composed of a curve, the guide ring hits the glass at a point and is easily worn.
Due to this level difference, when the mouth mold opens (step (d) in FIG. 15) or when other impacts are applied, a mouth chip with a missing R surface occurs. Even if the mouth is not chipped, there is a problem that the consumer is likely to have a stepped portion while using the bottle, which is dangerous, and the step hits the mouth and feels uncomfortable when drinking the beverage directly from the bottle mouth portion.
Billiards are said to occur due to the temperature difference of the guide ring molding surface or the impact when the mouth mold opens, and this significantly reduces the strength of the mouth.

In addition, the so-called “heavenly wave” in which the top surface of the glass bottle mouth portion is not flat but undulates easily.
This is said to be caused by the temperature difference of the guide ring molding surface. Due to the sky, the sealing of carbonated beverage bottles will be hindered.

  The present invention makes it possible to efficiently produce glass bottles by making it difficult to produce steps, mouth chipping, billiform defects, and sky wave defects occurring near the guide ring and mouth parting line of the glass bottle mouth. This is a problem.

  The guide according to the present invention is characterized in that, in the longitudinal section of the molding surface, a longitudinal linear portion is provided following the lower end of the curved portion forming the R surface from the outer edge of the top surface of the glass bottle portion to the upper end of the side surface. It is a ring. (Claim 1)

  As a result, a guide ring and a mouth-shaped parting line are formed on the face 8 below the R face 6 of the bottle mouth (FIGS. 5 and 6). Since the vertical cross section of the parting line 9 is a straight line, even if the bottle mouth is pulled by either split mold when the mouth mold is opened, the glass and the guide ring are likely to come in contact with each other. There are few and it is hard to produce a level difference. Further, even if a step is generated, it is extremely small, and no chipping occurs in the portion. Therefore, it becomes difficult to cause the defect of mouth chipping. The lower the part 8 facing the parting line 9, the larger the contact area between the guide ring and the glass, and when the mouth mold is opened, the resistance of the bottle mouth portion being pulled to one of the split molds is increased, resulting in wear. It becomes more difficult to occur.

The temperature during molding of the guide ring molding surface 2 is higher on the inner side and lower on the outer side. As a result of computer simulation, it has been found that the temperature difference of the guide ring of the present invention is extremely small as compared with the prior art.
By reducing the temperature difference of the guide ring molding surface, the defects of chatter and celestial waves are reduced.

  The length of the straight portion 5 of the guide ring forming surface 2 is suitably 0.3 to 1.5 mm. (Claim 2)

Since the contact area between the guide ring and the glass increases as the parting line is located below the face 8, the effect that the step is less likely to occur is reduced unless the length of the straight portion 5 is less than 0.3 mm.
When the length of the straight line portion exceeds 1.5 mm, the mouth mold 10 is opened in half and the parison P held by the mouth mold 10 and the guide ring 1 is released into the finishing mold 23 ( The process of FIG. 15 (d)), the opening of the parison (demolding from the guide ring) is not smooth, and there is a possibility that a molding trouble will occur such as the finishing mold 23 biting the parison.

  The straight portion 5 of the guide ring molding surface 2 can be inclined with respect to the vertical line so that the diameter of the molding surface increases toward the lower side. (Claim 3)

  When the straight part 5 is tilted, it becomes a draft, and when the mouth mold 10 is opened in half, the parison is smoothly removed from the guide ring, so that no excessive force acts on the mouth. There is no risk of such disadvantages.

  When the present invention is applied to form a glass bottle whose face 8 is originally cylindrical (vertical surface), the inclination angle of the straight portion 5 of the guide ring forming surface 2 is suitably 0.5 ° to 5 °. It is. (Claim 4)

If the inclination angle of the straight line portion 5 is 0.5 ° or more, the effect of the draft is satisfactorily exhibited, but about 1.0 ° is most desirable. If the angle is 5 ° or more, the diameter near the top of the mouth becomes small, which may cause a problem in cap performance. If it is about 1.0 °, it is almost impossible to visually recognize that there is an angle.
When the present invention is applied to the formation of a glass bottle whose face 8 is originally a conical shape (inclined surface), the inclination angle of the straight portion 5 of the guide ring may remain the same.

  Further, the present invention is a glass bottle formed by the guide ring according to any one of claims 1 to 4, wherein the guide ring and the parting line of the mouth mold appear on the lower surface of the R surface. is there. (Claim 5)

This glass bottle is characterized in that a guide ring and a mouth-shaped parting line appear on the face below the R-plane.
As mentioned above, there is no step on the parting line or it is very small, so there is no danger that the consumer will lose the R part while using the bottle, and the step hits the mouth when drinking the drink directly from the bottle mouth part, which makes it uncomfortable. I don't feel
Moreover, since there is almost no heaven wave, it is excellent in the sealing performance as a carbonated drink bottle.

When a glass bottle is manufactured with a mold including the guide ring of the present invention, the steps generated near the parting of the guide ring and mouth mold of the glass bottle mouth, the chipping of the mouth, the dimples, and the defects of the sky wave are extremely reduced. Glass bottles can be produced efficiently.
Further, the so-called “heavenly wave” in which the top of the glass bottle mouth portion is not flat but undulated is almost eliminated.

Since the glass bottle of the present invention has no step at the lower end of the R surface, there is no danger that the consumer will lose the R portion while using the bottle. Nor.
Moreover, since there is almost no heaven wave, it is excellent in the sealing performance as a carbonated drink bottle.

It is a general | schematic center longitudinal cross-sectional view of the guide ring 1 of an Example. It is the A section enlarged view of FIG. It is explanatory drawing of inclination-angle (theta) of a linear part. It is a general | schematic center longitudinal cross-sectional view of the opening | mouth type | mold with which the guide ring of the Example was mounted | worn. It is a side view of a mouth part shape | molded using the guide ring of an Example. It is the C section enlarged view of FIG. It is a general | schematic center longitudinal cross-sectional view of the conventional guide ring. It is the D section enlarged view of FIG. It is a general | schematic center longitudinal cross-sectional view of the opening | mouth type | mold equipped with the conventional guide ring. It is a side view of the mouth part shape | molded using the conventional guide ring. It is the E section enlarged view of FIG. It is a schematic diagram of the enlarged trace result of the glass bottle of an Example. It is a schematic diagram of the enlarged trace result of the glass bottle of a comparative example. It is explanatory drawing of a thickness gauge test. It is explanatory drawing of glass bottle shaping | molding by a blow and blow system. It is explanatory drawing of parison shaping | molding.

1 to 3 relate to the guide ring 1 of the embodiment.
The basic shape of the guide ring 1 is the same as the conventional one, but the feature is the shape of the molding surface 2.
The molding surface 2 has, in its longitudinal section, a straight line portion 5 in the vertical direction following the lower end 4 of the curved portion 3 that forms the R surface from the outer edge of the top of the glass bottle mouth to the upper end of the side surface. In the present embodiment, the length t of the straight portion 5 is 1.0 mm. (Figure 2)
The straight line portion 5 is inclined with respect to the vertical line v so that the diameter of the molding surface 2 increases toward the lower side. The inclination angle θ is 1.0 ° in this embodiment. (Figure 3)

FIG. 4 is a cross-sectional view of a state in which the guide ring 1 of the embodiment is mounted on the mouthpiece 10.
The basic shape of the mouth mold 10 is the same as the conventional one, but since the straight portion 5 is formed on the molding surface 2 of the guide ring 1, only the relevant portion is changed so as to be adapted thereto.

5 and 6 are side views of the mouth portion of the glass bottle B of the embodiment formed using the guide ring 1 and the mouth mold 10 of FIG. The coarse mold, finish mold and bottom mold were exactly the same as the conventional ones.
In this glass bottle B, the parting line 9 of the guide ring 1 and the mouth mold 10 appears on the face 8 below the R surface 6 (below the lower end 7 of the R surface).

[Comparative Example]
7 to 9 relate to a conventional guide ring 1 and a mouth mold 10 for forming a glass bottle having the same shape as that of the previous embodiment.
The molding surface 2 of the conventional guide ring 1 does not have a linear portion below the curved portion 3. The lower end 4 of the curved portion 3 corresponds to the R surface lower end 7 of the bottle mouth portion.
When comparing the comparative example of FIG. 9 and the embodiment of FIG. 4, in FIG. 9, the parting line of the guide ring 1 and the mouth mold 10 is formed at the lower end of the curved portion 3, whereas in FIG. Is lower than this, and the others are exactly the same.

10 and 11 are explanatory views of the mouth portion of the glass bottle B of the comparative example formed using the conventional guide ring 1 (FIGS. 7 to 9) of the comparative example.
In this glass bottle B, the parting line 9 between the guide ring 1 and the mouth mold 10 appears at the lower end 7 of the R surface, that is, the boundary between the R surface 6 and the face 8.

When a glass bottle was molded for 22 days from September 2, 2008 to September 23, 2008 using the guide ring of the comparative example, the mouth mold and the guide ring were I had to change 31 times.
Then, using the guide ring of the example, a glass bottle having the same shape was molded for 25 days from February 10, 2009 to March 6, 2009 under the same conditions as described above. There was no need to replace the mouth mold and guide ring.
This proved that the present invention can almost completely prevent the defect of mouth chipping.

About the glass bottle shape | molded using the guide ring of an Example and a comparative example, the expansion expansion of the shape was performed.
In this case, the mouth portion of the glass bottle is enlarged and traced in the vertical direction at four intervals at intervals of 90 °, and the shapes are overlapped to confirm the disorder of the mouth portion shape.

  FIG. 12 is a schematic view of an enlarged trace result of the glass bottle of the example. The four trace shapes almost completely overlap, and there is no disturbance such as celestial waves in the mouth shape. Although a slight step appears in the parting line, the step is small and the position is also confronted, so there is no possibility that this portion will be lost. Further, even when the consumer drinks the beverage directly from the bottle mouth, the step does not hit the mouth and does not feel uncomfortable.

FIG. 13 is a schematic diagram of an enlarged trace result of the glass bottle of the comparative example. It can be seen that at the lower end of the R surface (parting line), the trace shapes do not overlap and a step is generated. In addition, it can be seen that the trace shapes do not overlap even on the top surface, and a celestial wave is generated.
This step is likely to occur when the guide ring or the mouth mold is worn, and a mouth chip occurs when the step is large.
A celestial wave is generated when the guide ring or mouth temperature is upset. It was very difficult to control the temperature of the mold to prevent celestial waves, and celestial waves could not be completely prevented.
However, according to the present invention, it is possible to almost completely prevent mouth chipping and sky waves.

Thickness gauge tests were conducted on glass bottles molded using the guide rings of the examples and comparative examples.
In this test, as shown in FIG. 14, the glass bottle B is placed upside down on a smooth substrate, and a thickness gauge of 0.03 mm in thickness is inserted from various angles between the top of the bottle mouth and the substrate. The thickness gauge is used to test whether there is a part that enters between the top of the bottle mouth and the substrate. If there is a part where the thickness gauge enters, it will be rejected because there is a defect of celestial waves, otherwise the top of the mouth will be smooth and there will be no defect of celestial waves, and it will pass.

100 glass bottles of Examples and Comparative Examples were randomly selected, and a thickness gauge test was conducted.
All of the glass bottles of the examples passed, but 10 glass bottles of the comparative examples failed.
This also proves that the present invention can almost completely prevent the drawbacks of celestial waves.

Regarding the guide ring of the example (FIG. 2) and the guide ring of the comparative example (FIG. 8), the temperature distribution of the molding surface 2 during molding was analyzed by computer simulation. The temperature of the guide ring molding surface 2 is higher on the inner side and lower on the outer side. The temperature difference between the innermost point P and the outermost point Q was 12 ° in the comparative example (FIG. 8), but 5 ° in the example (FIG. 2).
That is, in the guide ring of the present invention, the temperature difference of the molding surface is smaller than that of the conventional one, which makes it difficult for the defects of sky waves and ribs to occur.

  In the description of the glass bottle forming process, the glass bottle is formed by the blow and blow method. However, the present invention can be used in the press and blow method in the same manner. In addition, the specific shape of the guide ring in the embodiment is merely an example, and the present invention can be applied to any conventional shape of the guide ring.

DESCRIPTION OF SYMBOLS 1 Guide ring 2 Molding surface 3 Curved part 4 Curved part lower end 5 Linear part 6 R surface 7 R surface lower end 8 Faced 9 Parting line 10 Mouth mold 11 Molded surface 12 Linear part 13 Joint 14 Thickness gauge 20 Rough mold 21 Plunger 22 Baffle 23 Finishing type 24 Bottom type 25 Mechanism B Glass bottle

Claims (5)

  A guide ring, characterized in that, in the longitudinal section of the molding surface, a longitudinal linear portion is provided following the lower end of the curved portion forming the R surface from the outer edge of the top surface of the glass bottle mouth to the upper end of the side surface.   The guide ring according to claim 1, wherein a length of the straight portion is 0.3 to 1.5 mm.   The guide ring according to claim 1, wherein the straight portion is inclined with respect to a vertical line so that the diameter of the molding surface increases toward the lower side.   The guide ring according to claim 3, wherein an angle of the inclination is 0.5 ° to 5 °.   A glass bottle formed by the guide ring according to claim 1, wherein a guide ring and a parting line of a mouth mold appear on a face below the R surface.

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