Blow-and-blow molding machine

Abstract

To provide a blow-and-blow molding device that can arrange a baffle mark radially inside a bottle.SOLUTION: A blow-and-blow molding device 1 has a rough mold 4, a funnel 5 and a baffle 6. A lower part of the baffle has a baffle-side mold surface 41, a first outer peripheral surface 42, a first figure top surface 43, and a second outer peripheral surface 44 which are arranged in order from below. The second outer peripheral surface is formed into a conical surface which becomes narrower in width downward, and can come into surface contact with an inner peripheral surface upper part 29 of the funnel. The first figure top surface is formed into an annular plane and connected to a lower end of the second outer peripheral surface at its outer peripheral edge, and can come into surface contact with a second wall surface 24. The first outer peripheral surface is formed into a conical surface which extends downward from an inner peripheral edge of the first figure top surface and becomes narrower in width downward, and can come into surface contact with a third wall surface 25. The baffle-side mold surface is connected to a lower end edge of the first outer peripheral surface. The baffle has a compressed air path 51 which is open on the first figure top surface.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a blow-and-blow molding apparatus for forming a parison from a glass gob.

Background Art

[0002] A blow-and-blow molding apparatus for forming a parison from a glass gob is known. The molding apparatus includes a pair of rough molds that form a cavity in a mating surface, a mouth mold that closes the lower end of the cavity and forms the mouth of the parison, a funnel connected to the upper end of the cavity that guides the fall of the gob into the cavity, and a baffle connected to the upper end of the cavity or the upper end of the funnel. An air passage for supplying settle air is formed in the baffle. When the baffle is connected to the funnel, the end of the air passage connects to the inside of the funnel and settle air is supplied to the cavity. On the other hand, when the baffle is directly connected to the rough mold, the end of the air passage is blocked by the rough mold. In this state, the lower end of the baffle constitutes a mold surface corresponding to the bottom of the parison.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the blow-and-blow molding apparatus described in the above-mentioned patent document, the baffle and funnel are connected by surface contact between a tapered baffle-side contact surface provided on the outer circumference of the lower part of the baffle and a tapered funnel-side contact surface provided on the inner circumference of the upper part of the funnel. The baffle-side contact surface is connected to the rough mold by surface contact between the rough mold-side contact surface provided on the upper end of the rough mold. The funnel-side contact surface has a diameter corresponding to the diameter of the baffle-side contact surface and the diameter of the rough mold-side contact surface. The connection between the baffle mold surface and the rough mold mold surface is located on the outer circumference of the parison. The connection between the baffle mold surface and the rough mold mold surface leaves a mark on the molded glass bottle as a baffle mark. One method to place the baffle mark radially inward at the bottom of the bottle is to reduce the diameters of the baffle mold surface and the rough mold mold surface. However, since the connection between the baffle mold surface and the rough mold mold surface becomes acute, there is a risk of the connection being chipped or worn. As a result, defects such as protrusion may occur near the baffle mark. Therefore, conventional blow-and-blow molding machines have the problem of being unable to position the baffle mark radially inward of the bottle.

[0005] In view of the above background, the present invention aims to provide a blow-and-blow molding apparatus that can position baffle marks on the radially inward side of the bottle. [Means for solving the problem]

[0006] To solve the above problems, one aspect of the present invention is a blow-and-blow molding apparatus (1) for forming a parison (P) from a glass gob (G), comprising a rough mold (4), a funnel (5), and a baffle (6), wherein the rough mold has a rough mold cavity (14) formed inside the rough mold and an upper connecting hole (16) extending from the upper end of the rough mold cavity to the upper end surface of the rough mold, and the upper connecting hole has a first wall surface (23), a second wall surface ( 24), and a third wall surface (25) are formed, the first wall surface is formed as a conical surface that extends downward from the upper end surface of the rough mold and narrows in width downward, the second wall surface is formed as an annular plane facing upward and is connected to the lower end of the first wall surface at its outer peripheral edge, the third wall surface is formed as a conical surface that extends downward from the inner peripheral edge of the second wall surface to the upper end of the rough mold cavity and narrows in width downward, and the funnel is a cylindrical shape that opens at the top and bottom The funnel is formed as follows: The funnel has a lower end surface (27) that can surface contact the second wall surface, a lower outer peripheral surface (28) that can surface contact the first wall surface, and an upper inner peripheral surface (29) that has the same inclination as the first wall surface. The lower part of the baffle has a baffle-side molded surface (41), a first outer peripheral surface (42), a first upper surface (43), and a second outer peripheral surface (44) arranged in order from bottom to top. The second outer peripheral surface is formed as a conical surface that narrows in width downwards, and the upper inner peripheral surface and the surface The first upper surface is contactable, and is formed in an annular plane, connected at its outer peripheral edge to the lower end of the second outer surface, and is capable of surface contact with the second wall surface. The first outer surface extends downward from the inner peripheral edge of the first upper surface, is formed in a conical surface that narrows in width downward, and is capable of surface contact with the third wall surface. The baffle side mold surface is connected to the lower end edge of the first outer surface, and the baffle has a compressed air passage (51) that opens to the first upper surface.

[0007] In this embodiment, the baffle and the funnel are connected by surface contact between the second outer surface of the baffle and the upper part of the inner surface of the funnel. Furthermore, the baffle and the rough mold are connected by surface contact between the first outer surface of the baffle and the third wall surface of the rough mold. The diameter of the first outer surface can be reduced regardless of the diameter of the funnel. This allows for a reduction in the diameter of the baffle-side mold surface provided at the lower end of the first outer surface. Also, because the third wall surface that makes surface contact with the first outer surface is formed as a conical surface, even if the angle of the upper end of the rough mold-side mold surface is inclined, the angle formed by the connection between the rough mold-side mold surface and the third wall surface can be maintained at a relatively large angle. This allows the connection between the rough mold-side mold surface and the baffle-side mold surface to be positioned radially inward of the rough mold-side mold surface. These features enable the provision of a blow-and-blow molding apparatus that can position the baffle mark radially inward of the bottle.

[0008] In the above embodiment, the second outer peripheral surface may be able to come into surface contact with the first wall surface.

[0009] In this embodiment, the first outer surface, the first upper surface, and the second outer surface abut against the corresponding third wall surface, second wall surface, and first wall surface, so that the baffle is supported stably in a rough form.

[0010] In the above embodiment, the upper end of the rough cavity may have a smaller horizontal cross-sectional area towards the top.

[0011] According to this embodiment, the connection between the rough side mold surface and the baffle side mold surface can be positioned radially inward of the rough side mold surface.

[0012] In the above embodiment, the angle between the upper end of the rough mold side surface forming the rough mold cavity and the third wall surface may be 70 degrees or more and 130 degrees or less.

[0013] According to this embodiment, the durability of the connection between the third wall surface and the rough mold side surface can be improved.

[0014] In the above aspect, the baffle side surface may be formed as a concave surface recessed upward, and the upper edge of the rough mold side surface may be smoothly connected to the baffle side surface.

[0015] According to this aspect, the baffle marks formed on the bottle can be made unclear.

[0016] In the above aspect, the baffle extends radially outward from the outer peripheral edge of the second outer peripheral surface and has a second upper surface (46) facing downward, and the second upper surface may be capable of surface contact with the upper end surface of the funnel.

[0017] According to this aspect, since the first outer peripheral surface and the first upper surface abut against the corresponding upper inner peripheral surface and the upper end surface, the baffle is stably supported on the funnel.

[0018] In the above aspect, the funnel may have an inner diameter smaller than the inner diameter of the lower end of the third wall surface.

[0019] According to this aspect, when the gob is supplied into the rough mold, contact between the gob and the third wall surface can be prevented.

Advantages of the Invention

[0020] According to the present invention, it is possible to provide a blow-and-blow molding apparatus capable of arranging baffle marks inside the bottle in the radial direction.

Brief Description of the Drawings

[0021] [Figure 1] Explanatory drawing of the blow-and-blow molding apparatus and the glass bottle molding apparatus according to the embodiment [Figure 2] Cross-sectional view showing a second form of the blow-and-blow molding apparatus [Figure 3] Cross-sectional view showing a third form of the blow-and-blow molding apparatus [Figure 4] Image showing the bottom of the glass bottle

Modes for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described. The blow-and-blow molding apparatus 1 according to this embodiment performs a parison molding process for forming a parison P from a glass gob G. The blow-and-blow molding apparatus 1 may be integrally configured with the glass bottle molding apparatus 2. The glass bottle molding apparatus 2 performs a glass bottle molding process for forming a glass bottle C from the parison P.

[0023] As shown in FIG. 1, the blow-and-blow molding apparatus 1 has a rough mold 4, a funnel 5, and a baffle 6. The blow-and-blow molding apparatus 1 also has a die 7. The glass bottle molding apparatus 2 has a finishing mold 8 and a bottom mold 9 corresponding to the glass bottle C.

[0024] The die 7 is supported by a reversing arm 12 that is rotatably supported on a base 11. The reversing arm 12 has a rotation center extending in the horizontal direction and rotates between a horizontal extended initial position and a reversed position rotated 180° upward from the initial position. The die 7 is supported at the tip of the reversing arm 12. The die 7 protrudes upward from the tip of the reversing arm 12 when the reversing arm 12 is in the initial position.

[0025] The die 7 has a pair of die pieces 7A having mating surfaces extending vertically and a guide ring 7B disposed between the pair of die pieces 7A. A die cavity 7C extending vertically is formed on the mating surface of the die piece 7A. Each of the pair of die pieces 7A and the guide ring 7B is supported by the reversing arm 12. The base 11 is provided with a plunger 7D that passes through the guide ring 7B and enters the die cavity 7C when the die 7 is in the initial position. The plunger 7D is movable between a position where it enters the die cavity 7C and a retracted position where it disengages downward from the die cavity 7C. When the plunger 7D is in the entering position, the die 7 forms a shape corresponding to the mouth portion of the parison P between the pair of die pieces 7A and the plunger 7D.

[0026] When the reversing arm 12 is in its initial position, the rough mold 4 is positioned above the reversing arm 12. As shown in Figure 2, the rough mold 4 has a rough mold cavity 14 formed inside the rough mold 4 and an upper connecting hole 16 extending from the upper end of the rough mold cavity 14 to the upper end surface 15 of the rough mold 4. The rough mold 4 also has a lower connecting hole 18 extending from below the rough mold cavity 14 to the lower end surface 17 of the rough mold 4. The rough mold 4 is formed by a pair of rough mold pieces 4A that abut at a mating surface 19 that extends vertically. The rough mold cavity 14, the upper connecting hole 16, and the lower connecting hole 18 are formed on the mating surface 19.

[0027] As shown in Figure 1, a pair of rough mold pieces 4A are supported on a base 11 so as to be movable between a working position and a retracted position. In the working position, the mating surfaces 19 of the pair of rough mold pieces 4A are in contact with each other. In the retracted position, the mating surfaces 19 of the pair of rough mold pieces 4A are separated from each other in the horizontal direction. When the pair of rough mold pieces 4A are in the working position, the lower parts of the pair of rough mold pieces 4A clamp the upper parts of the pair of mold pieces 7A from the horizontal direction. As a result, the mold 7 is received in the lower connecting hole 18 of the rough mold 4, and the lower end of the rough mold cavity 14 and the mold cavity 7C are connected.

[0028] As shown in Figure 2, the rough mold cavity 14 is formed by the rough mold side surface 21 formed on the mating surface 19. The rough mold side surface 21 forms the shape of the side of the parison P and the outer circumference of the bottom of the parison P. The upper end of the rough mold cavity 14 corresponds to the outer circumference of the bottom of the parison P. The upper end of the rough mold side surface 21 forms the outer circumference of the bottom of the parison P. The horizontal cross-sectional area of ​​the upper end of the rough mold cavity 14 decreases upwards. That is, the upper end of the rough mold side surface 21 is inclined upwards toward the central axis of the rough mold 4. In addition, the diameter of the upper end of the rough mold cavity 14 is formed to be smaller than the maximum diameter of the rough mold cavity 14.

[0029] The upper connection hole 16 is formed by a first wall surface 23, a second wall surface 24, and a third wall surface 25, arranged from top to bottom. The first wall surface 23 extends downward from the upper end surface 15 of the rough mold 4 and is formed as a conical surface that narrows in width downwards. The second wall surface 24 is formed as an annular plane facing upwards and is connected to the lower end of the first wall surface 23 at its outer peripheral edge. The third wall surface 25 extends downward from the inner peripheral edge of the second wall surface 24 to the upper end of the rough mold cavity 14 and is formed as a conical surface that narrows in width downwards. In other words, the upper and lower parts of the upper connection hole 16 are tapered holes that narrow downwards. The upper surface is formed by the second wall surface 24 at the boundary between the upper and lower parts of the upper connection hole 16.

[0030] The angle θ between the upper end of the rough mold side surface 21 and the third wall surface 25 is preferably between 70 degrees and 130 degrees. Furthermore, the angle θ between the upper end of the rough mold side surface 21 and the third wall surface 25 is preferably between 90 degrees and 120 degrees. It is even better if the angle θ between the upper end of the rough mold side surface 21 and the third wall surface 25 is obtuse. This improves the durability of the connection between the rough mold side surface 21 and the third wall surface 25.

[0031] A funnel 5 or baffle 6 is connected to the upper connection hole 16. The funnel 5 is formed in a cylindrical shape with openings at the top and bottom. The funnel 5 has a lower end surface 27 that can make surface contact with the second wall surface 24, a lower outer peripheral surface 28 that can make surface contact with the first wall surface 23, and an upper inner peripheral surface 29 that has the same inclination as the first wall surface 23. When viewed from above, the upper inner peripheral surface 29 overlaps with the first wall surface 23. The funnel 5 is formed in a cylindrical shape.

[0032] The lower end surface 27 of the funnel 5 is formed as an annular horizontal plane. The lower edge of the lower outer surface 28 is connected to the outer edge of the lower end surface 27. The lower outer surface 28 is formed as a conical surface that narrows in width downwards. The funnel 5 has an upper end surface 31 at its upper end. The upper end surface 31 is formed as an annular horizontal plane. The upper edge of the upper inner surface 29 is connected to the inner edge of the upper end surface 31. The upper inner surface 29 is formed as a conical surface that narrows in width downwards.

[0033] The lower part 32 of the inner circumferential surface of the funnel 5 is formed as a conical surface that narrows in width towards the bottom. The funnel 5 is supported by a funnel moving device (not shown).

[0034] The lower part of the baffle 6 has, in order from bottom to top, a baffle-side molded surface 41, a first outer peripheral surface 42, a first upper surface 43, and a second outer peripheral surface 44. The second outer peripheral surface 44 is formed as a conical surface that narrows in width toward the bottom. The second outer peripheral surface 44 can make surface contact with the upper part of the inner peripheral surface 29. The first upper surface 43 is formed as an annular plane. The first upper surface 43 is connected at its outer peripheral edge to the lower end of the second outer peripheral surface 44. The first upper surface 43 can make surface contact with the second wall surface 24. The first outer peripheral surface 42 extends downward from the inner peripheral edge of the first upper surface 43. The first outer peripheral surface 42 is formed as a conical surface that narrows in width toward the bottom. The first outer peripheral surface 42 can make surface contact with the third wall surface 25. The baffle-side molded surface 41 is connected to the lower end edge of the first outer peripheral surface 42. The baffle side surface 41, the first outer peripheral surface 42, the first upper surface 43, and the second outer peripheral surface 44 are arranged coaxially with the central axis of the baffle 6 that extends vertically.

[0035] The second outer peripheral surface 44 may be formed to be in surface contact with the first wall surface 23. In other embodiments, the second outer peripheral surface 44 may be formed smaller than the first wall surface 23 in order to provide a fitting clearance.

[0036] The baffle 6 has a second upper surface 46 that extends radially outward from the outer edge of the second outer surface 44 and faces downward. The second upper surface 46 is preferably able to make surface contact with the upper end surface 31 of the funnel 5. A flange portion 47 is provided in the central part of the baffle 6 in the vertical direction, extending radially outward from the second outer surface 44. The flange portion 47 is formed in a disc shape with its surfaces facing up and down. The second upper surface 46 constitutes the lower surface of the flange portion 47. The diameter of the flange portion 47 is larger than the diameter of the upper edge of the second outer surface 44. A cylindrical portion 48 extending upward is provided on the upper surface of the flange portion 47.

[0037] The baffle 6 has a compressed air passage 51 that opens to the upper surface 43 of the first form. The compressed air passage 51 has an upper passage 51A that extends linearly vertically inside the cylindrical portion 48, and at least one lower passage 51B that extends linearly from the lower end of the upper passage 51A, inclined with respect to the vertical direction, to the upper surface 43 of the first form. The upper end of the upper passage 51A opens to the upper end of the cylindrical portion 48. The upper end of the upper passage 51A is connected to a compressed air source via a supply pipe (not shown).

[0038] The upper end of the cylindrical portion 48 is supported by a baffle moving device (not shown). The baffle moving device has a power source such as an electric motor and moves the baffle 6. The compressed air supply pipe may be integrally provided with the baffle moving device.

[0039] The baffle-side mold surface 41 is formed as a concave surface that is recessed upwards. The outer edge of the baffle-side mold surface 41 and the upper edge of the rough-side mold surface 21 are each formed in a circular shape. The outer edge of the baffle-side mold surface 41 can be connected to the upper edge of the rough-side mold surface 21. It is preferable that the upper edge of the rough-side mold surface 21 can be smoothly connected to the baffle-side mold surface 41.

[0040] The operation and effects of the blow-and-blow molding apparatus 1 configured as described above will now be explained. The blow-and-blow molding apparatus 1 can take on a first form for receiving glass gobs G (see Figure 1), a second form for performing settle blowing (see Figure 2), a third form for performing counter-blowing (see Figure 3), and a fourth form for removing parisons P.

[0041] As shown in Figure 1, in the first embodiment of the blow-and-blow molding apparatus 1, the reversing arm 12 is positioned in its initial position, and the mold 7 is positioned above the reversing arm 12. The pair of rough mold pieces 4A come into contact with each other at the mating surface 19, sandwiching the mouth portion. This connects the rough mold cavity 14 and the mold cavity 7C. The funnel 5 is connected to the upper connecting hole 16 of the rough mold 4. At this time, the lower end surface 27 comes into contact with the second wall surface 24, and the lower outer peripheral surface 28 comes into contact with the first wall surface 23, thereby determining the position of the funnel 5 relative to the rough mold 4. In this state, the lower end of the lower inner peripheral surface 32 of the funnel 5 extends radially inward from the lower end of the third wall surface 25. The baffle 6 is retracted to a position laterally away from the funnel 5 and the rough mold 4.

[0042] When the blow-and-blow molding apparatus 1 is in its first configuration, the glass gob G falls toward the funnel 5. The glass gob G enters from the upper end of the funnel 5 and is guided by the funnel 5 to fall into the rough mold cavity 14. At this time, since the lower end of the lower part 32 of the inner circumferential surface of the funnel 5 extends radially inward more than the lower end of the third wall surface 25, contact between the glass gob G and the third wall surface 25 is avoided.

[0043] As shown in Figure 2, in the second embodiment of the blow-and-blow molding apparatus 1, the nozzle 7, rough mold 4, and funnel 5 are the same as in the first embodiment, and furthermore, a baffle 6 is connected to the upper end of the funnel 5. The position of the baffle 6 relative to the funnel 5 is determined by the contact between the upper inner surface 29 and the second outer surface 44. At this time, the upper end surface 31 and the second upper surface 46 may also be in contact. The position of the baffle 6 relative to the funnel 5 is stabilized by the contact between the upper end surface 31 and the second upper surface 46. In the second embodiment, since the first upper surface 43 is separated from the inner surface of the funnel 5, the compressed air passage 51 is connected to the rough mold cavity 14 via the inside of the funnel 5.

[0044] In the second embodiment, compressed air is supplied to the upper end of the rough cavity 14 via the baffle 6 and funnel 5, pushing the glass gob G downward and making tight contact with the mouth 7. That is, the settling blow causes the glass gob G to make tight contact with the mouth 7, forming the mouth of the parison P. The mouth of the parison P is cooled by the mouth 7, and its shape is determined.

[0045] In the third embodiment of the blow-and-blow molding apparatus 1, the nozzle 7 and rough mold 4 are the same as in the first embodiment, but the funnel 5 is retracted from the rough mold 4, and the baffle 6 is directly connected to the rough mold 4. The position of the baffle 6 relative to the rough mold 4 is determined by the first outer peripheral surface 42 contacting the third wall surface 25 and the first upper surface 43 contacting the second wall surface 24. At this time, the second outer peripheral surface 44 may also contact the first wall surface 23. The position of the baffle 6 relative to the rough mold 4 is stabilized by the contact between the second outer peripheral surface 44 and the first wall surface 23. The outer peripheral edge of the baffle-side mold surface 41 is connected to the upper edge of the rough mold-side mold surface 21. The lower end of the compressed air passage 51 is closed by the second wall surface 24.

[0046] As shown in Figure 3, in the third embodiment, compressed air is supplied to the inside of the mouth of the parison P through the mouth mold 7, causing the parison P to expand upward. The outer surface of the parison P comes into contact with the rough side mold surface 21 and the baffle side mold surface 41, and is molded into a predetermined shape.

[0047] In the fourth configuration of the blow-and-blow molding apparatus 1, the baffle 6 retracts from the rough mold 4, and the pair of rough mold pieces 4A separate from each other and move away from the parison P. In this state, the parison P is supported by the mouth mold 7. By rotating the reversing arm 12 from its initial position to the reversing position, the parison P supported by the mouth mold 7 moves to the glass bottle molding apparatus 2. Subsequently, the finishing mold 8 and the bottom mold 9 are positioned around the parison P. In this state, the mouth mold 7 releases the parison P, and the parison P is supported by the molding mold. Next, the reversing arm 12 returns from the reversing position to its initial position. Then, the mouth mold 7, rough mold 4, and funnel 5 are set, and the blow-and-blow molding apparatus 1 returns to its first configuration.

[0048] According to the blow-and-blow molding apparatus 1 of the above embodiment, the baffle 6 and the funnel 5 are connected by surface contact between the second outer peripheral surface 44 of the baffle 6 and the upper part 29 of the inner peripheral surface of the funnel 5. In addition, the baffle 6 and the rough mold 4 are connected by surface contact between the first outer peripheral surface 42 of the baffle 6 and the third wall surface 25 of the rough mold 4. The diameter of the first outer peripheral surface 42 can be reduced regardless of the diameter of the funnel 5. This makes it possible to reduce the diameter of the baffle-side mold surface 41 provided at the lower end of the first outer peripheral surface 42. Furthermore, since the third wall surface 25 that makes surface contact with the first outer peripheral surface 42 is formed as a conical surface, even if the angle of the upper end of the rough mold-side mold surface 21 is inclined, the angle θ formed by the connection between the rough mold-side mold surface 21 and the third wall surface 25 can be kept relatively large. This makes it possible to position the connection between the rough mold-side mold surface 21 and the baffle-side mold surface 41 radially inward of the rough mold-side mold surface 21. These features enable the provision of a blow-and-blow molding apparatus 1 that can position the baffle mark 61 radially inward of the glass bottle C, as shown in Figure 4.

[0049] The blow-and-blow molding apparatus 1 makes it possible to position the baffle marks 61 inside the knurling 63 formed on the bottom of the glass bottle C. The knurling 63 consists of multiple protrusions formed on the bottom of the glass bottle C and arranged in a ring shape on the bottom of the glass bottle C. This makes it possible to avoid contact between the baffle marks 61 and the conveyor when the glass bottle C is transported by the conveyor. For example, when the glass bottle C is moved from one conveyor to another, it is possible to prevent the baffle marks 61 from getting caught on the conveyor and tipping over.

[0050] Since the upper end of the rough mold cavity 14 has a smaller horizontal cross-sectional area towards the top, the connection between the rough mold side surface 21 and the baffle side surface 41 can be positioned radially inward of the rough mold side surface 21. This allows the baffle mark 61 to be positioned further radially inward.

[0051] Since the baffle-side mold surface 41 is formed as a concave surface and the baffle-side mold surface 41 and the rough-side mold surface 21 are smoothly connected, the baffle marks 61 formed on the glass bottle C can be made indistinct. This makes it possible to suppress contact between the baffle marks 61 and the conveyor that transports the glass bottle C.

[0052] This concludes the description of specific embodiments, but the present invention is not limited to the above embodiments and can be broadly modified and implemented. [Explanation of Symbols]

[0053] 1: Blow-and-blow molding machine 2: Molding equipment 4: Coarse mold 5: Funnel 6: Baffle 7:Mouth type 14: Rough mold cavity part 15:Top end surface 16: Upper connection hole 19: Joining surface 21: Rough mold side mold surface 23: First wall 24: Second wall 25: Third Wall 27: Bottom end surface 28: Lower part of outer circumferential surface 29: Upper inner surface 31: Upper end surface 32: Lower part of inner circumferential surface 41: Baffle side mold surface 42: First outer peripheral surface 43:Top view of 1st figure 44: Second outer peripheral surface 46:Top view of second figure 51: Compressed air passage G: Glass Goblin P: Parison

Claims

1. A blow-and-blow molding apparatus for forming parisons from glass gobs, comprising a rough mold, a funnel, and a baffle, The rough mold has a rough mold cavity formed inside the rough mold and an upper connecting hole extending from the upper end of the rough mold cavity to the upper end surface of the rough mold. The upper connection hole is formed by a first wall surface, a second wall surface, and a third wall surface arranged in order from top to bottom. The first wall surface is formed as a conical surface that extends downward from the upper end surface of the rough mold and narrows in width downwards. The second wall surface is formed in an annular plane facing upward, and is connected at its outer edge to the lower end of the first wall surface. The third wall surface extends downward from the inner periphery of the second wall surface to the upper end of the rough cavity, and is formed as a conical surface that narrows in width downward. The aforementioned funnel is formed in a cylindrical shape with openings at the top and bottom, The funnel has a lower end surface that can make surface contact with the second wall surface, a lower outer peripheral surface that can make surface contact with the first wall surface, and an upper inner peripheral surface that has the same inclination as the first wall surface. The lower part of the baffle has, in order from bottom to top, a baffle side mold surface, a first outer peripheral surface, a first upper surface, and a second outer peripheral surface. The second outer surface is formed as a conical surface that narrows in width downwards and is capable of surface contact with the upper part of the inner surface. The first upper surface is formed in an annular plane, is connected at its outer edge to the lower end of the second outer surface, and is capable of surface contact with the second wall surface. The first outer surface extends downward from the inner edge of the first upper surface and is formed as a conical surface that narrows in width downward, and is capable of surface contact with the third wall surface. The baffle-side mold surface is connected to the lower edge of the first outer peripheral surface, The baffle is a blow-and-blow molding apparatus having a compressed air passage that opens to the upper surface of the first form.

2. The blow-and-blow molding apparatus according to claim 1, wherein the second outer peripheral surface is capable of surface contact with the first wall surface.

3. The blow-and-blow molding apparatus according to claim 1, wherein the upper end of the rough cavity portion has a decreasing horizontal cross-sectional area towards the top.

4. The blow-and-blow molding apparatus according to claim 3, wherein the angle between the upper end of the rough mold side surface forming the rough mold cavity and the third wall surface is 70 degrees or more and 130 degrees or less.

5. The baffle-side mold surface is formed as a concave surface that is recessed upwards. The blow-and-blow molding apparatus according to claim 4, wherein the upper edge of the rough mold side surface is smoothly connected to the baffle side surface.

6. The baffle has a second upper surface that extends radially outward from the outer edge of the second outer surface and faces downward, The blow-and-blow molding apparatus according to claim 1, wherein the second upper surface is capable of surface contact with the upper end surface of the funnel.

7. The blow-and-blow molding apparatus according to claim 1, wherein the funnel has an inner diameter smaller than the inner diameter of the lower end of the third wall surface.

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