JP4299091B2 - Bottle mold cooling method and bottle mold used therefor - Google Patents

Description

  The present invention relates to a cooling method for a bottle forming die that cools a bottle forming die such as a rough die or a finishing die of a bottle making machine during molding, and a bottle forming die used therefor. The present invention relates to a cooling method for a bottle mold that cools by cooling the bottle mold and a bottle mold used therefor.

  In the bottle-making machine, it is old to guarantee the shape by cooling the rough mold and finishing mold during molding, and lowering the temperature of the parison and bottle that are molded sequentially from the high-temperature gob that they softened according to the molding stage. It is made from. Such cooling is generally performed by ventilation through cooling passages parallel to the axes arranged around the appearance surface of the rough mold or the finish mold (see, for example, Patent Documents 1 to 3).

  Japanese Patent Laid-Open Publication No. 2001-28103 discloses that a rough temperature difference due to a difference in heat radiation to the outside occurs due to a pair of adjacent rough molds, which adversely affects bottle molding. The technique which enabled it to adjust individually the ventilation volume from the plenum chamber with respect to a type | mold for every ventilation area provided in the circumferential direction is disclosed.

  In Patent Document 2, in particular, the adjacent arrangement of the rough mold and the finish mold and the surrounding installation equipment are obstructive, and the blower is complicated and tends to have high back pressure. The blower is shared between the rough mold and the finish mold. In order to cope with this, the semicircular arc type inlet that connects to the cooling passage arranged in the circumferential direction is provided on the outer peripheral part of the intermediate height part of the rough mold and finish mold, Disclosed is a technology that allows air to be blown to the cooling passage through the introduction port via a support member that supports the mold to open and close, and the ventilation passage to the cooling passage is diverted from the middle to both sides, so that the long cooling passage The temperature difference of the cooling air generated between the upstream side and the downstream side can be reduced as in the case where air is passed from one end to the other end.

Patent Document 3 discloses a technique for changing the diameter of the cooling passage between the upstream side and the downstream side. According to this, the cooling conditions can be adjusted even in the axial direction of the mold by changing the ventilation conditions such as the flow velocity depending on the difference in diameter.
Japanese Patent Laid-Open No. 03-228833 Japanese Patent Application Laid-Open No. 06-064931 JP-A-61-083637

  By the way, recently, energy saving, labor saving, and productivity improvement have been screamed, and while improving the yield of bottles is desired, the safety standards of bottles have increased, and ultra-thin ultra-light bottles have appeared. As accuracy standards increase, it is difficult to produce bottles with high yield.

  In molding various bottles based on a new standard, the present inventors have found that the top surface is inclined due to the inclination of the top surface, the neck is inclined, the body is deformed, the wall thickness is poor, and the surface is rough at the constricted portion or the recessed portion. Has experienced the occurrence of such. Billiards occur even when the cooling is excessive or insufficient, and the shape defect occurs frequently, especially in the formation of an ultralight bottle. It seems that the top slope and sag are simply insufficiently cooled, and a cooling ring around the shoulder and neck, and increasing the airflow to it, can be considered as a countermeasure and various experiments are considered. Did.

  If the top slope or sag can be eliminated, the hot end coating, which is a surface strengthening treatment after molding, may cause poor adhesion, bottoming, bottom cracking, distortion, etc. due to excessive cooling. It was. These are differences in various conditions such as the shape and thickness of the bottle, the size of the diameter, the relationship between the shape of the rough mold and the gob that is the molding material, and the parison that is the molding material of the finish mold. It means that the partial temperature control corresponding to the temperature distribution of the different figure is not properly performed due to the difference of the early and late contact between the figure and the molding material due to the shape relationship.

  For example, just by using a cooling passage parallel to the axis of the mold as described in Patent Documents 1 to 3, the cooling conditions in the circumferential direction can be adjusted as in Patent Document 1, or Even if the temperature difference of the cooling air between the upstream side and the downstream side is reduced as disclosed, it does not correspond to the elimination of the temperature distribution that differs in the axial direction of the appearance surface. Further, as disclosed in Patent Document 3, the cooling conditions are changed by changing the diameters on the upstream side and the downstream side, and this temporarily corresponds to the temperature distribution that differs in the axial direction in the axial direction. However, in the part far from the figure, it becomes a cooling action with a high degree of indirect, and the cooling does not reach the set condition, especially for those who want to cool partly strongly in order to prevent the top surface inclination and sag. I can't handle it. Furthermore, it cannot fully correspond to a local depression on the outer surface of the bottle or a constriction in the middle of the trunk.

  If this becomes possible, it will be possible to cope with differences in various molding conditions, including adjustment of cooling conditions in the circumferential direction and adjustment of cooling conditions in the axial direction, either alone or in the future. Thus, the temperature control of the appearance should be preferably achieved.

  From such a viewpoint, the present inventors have found and realized a cooling method that can sufficiently cope with the difference in temperature distribution in the axial direction of the appearance, and the difference in temperature distribution in the circumferential direction as necessary.

  An object of the present invention is to provide a bottle mold cooling method capable of preventing defective molding by accurately managing the temperature distribution of the appearance surface regardless of whether it is a rough mold or a finishing mold based on such a new cooling method, and It is to provide a bottle mold to be used.

  In order to achieve the above object, the bottle molding die cooling method of the present invention is a bottle molding die cooling method in which the mold being molded is cooled by a plurality of circumferentially directed airflows at a plurality of locations in the circumferential direction. One feature is to cool by performing the ventilation in a path that substantially follows the non-straight shape in the axial direction of the shape of the mold, using a connection of two or more holes that are drilled straight from the outer surface of the mold. Yes.

  In such a configuration, in order to cool the bottle molding die, the non-straight shape in the axial direction of the appearance surface is substantially imitated by using a connection of two or more holes that are drilled straight from the outer surface of the die. Ventilation through a simple path is a high degree of directness from a position that is close to the necessary degree to each part of the non-straight shape in the axial direction of the appearance, and thus cooling that reflects the set cooling conditions is realized. Regardless of whether it is a rough mold or a finished mold, the temperature distribution in the circumferential direction is sufficiently controlled by varying the degree of proximity in the circumferential direction as well as the temperature distribution in the axial direction. Even high bottles can be made with good yield.

  In such a method, a non-straight shape in the axial direction of the mold surface is obtained by connecting two or more holes that are drilled straight from the outer surface of the mold in a mold having a non-straight surface in the axial direction. The cooling passage can be realized by using a bottle forming die characterized by having at least one ventilation port and an exhaust port on the outer surface of the die. The mold can be easily and inexpensively manufactured simply by connecting two or more holes formed straight from the outer surface in a desired path.

  The bottle molding die cooling method according to the present invention is also a bottle molding die cooling method in which the mold being molded is cooled by vertical ventilation at a plurality of locations in the circumferential direction, and the bottle molding die is cooled straight from the outer surface of the mold. Almost exactly follows the non-straight shape in the axial direction of the mold surface using the connection of two or more holes, and the constriction forming part or the hollow forming part of the mold appearance surface has a bent part due to the connection between the holes. Another feature is to cool by performing the ventilation in the copying path.

  In such a configuration, in order to cool the bottle molding die, the non-straight shape in the axial direction of the appearance surface is substantially imitated by using a connection of two or more holes that are made straight from the outer surface of the die, Constriction forming part or concavity formation in the axial direction of the figure surface by ventilating through a simple path that follows the constriction forming part or concavity forming part of the mold form surface with a bent part by connecting holes. High degree of directness from the position close to the necessary degree for each non-straight-shaped part with a part, thus realizing cooling that well reflects the set cooling conditions, regardless of whether it is a rough mold or a finish mold, the axis line In addition to the temperature distribution in the direction, the temperature distribution in the circumferential direction can be sufficiently managed by making the degree of proximity different in the circumferential direction, and the ultra-light bottle and the required accuracy can be achieved without the influence of the presence of the constricted part or the recessed part. Ibin But it can be a good yield a bottle.

  In such a method, a non-straight shape in the axial direction of the mold surface is obtained by connecting two or more holes that are drilled straight from the outer surface of the mold in a mold having a non-straight surface in the axial direction. In addition, the constriction forming part or the hollow forming part of the shape of the mold is provided with a cooling passage that follows the bent part of the connection between the holes, and this cooling passage has at least one ventilation opening and one exhaust opening. It can be realized by using a bottle mold having other features, and the bottle mold can be formed by simply connecting two or more holes drilled straight from the outer surface in a desired path. Easy and inexpensive to manufacture.

  The bottle molding die cooling method according to the present invention is also a bottle molding die cooling method in which the mold being molded is cooled by vertical ventilation at a plurality of locations in the circumferential direction, and the bottle molding die is cooled straight from the outer surface of the mold. Another feature is that cooling is performed by passing the air in the path formed by the bent portion formed by the connection between the holes in the constriction forming portion or the recess forming portion of the mold using the connection of two or more holes. Yes.

  In such a configuration, in order to cool the bottle molding die, bending due to the connection between two or more holes that are drilled straight from the outer surface of the die with respect to the constriction formation portion or the depression formation portion in the axial direction of the appearance surface Due to the ventilation in a simple path that is imitated by the part, the degree of direct cooling is high from the position close to the necessary degree with respect to the constriction forming part and the hollow forming part in the axial direction of the figure, and therefore the set cooling condition is good. The reflected cooling is realized and the temperature distribution in the circumferential direction is sufficiently controlled by varying the degree of proximity in the circumferential direction as well as the temperature distribution in the axial direction, regardless of whether it is a rough mold or a finished mold. Even with ultra-light bottles and bottles with high accuracy, it is possible to produce bottles with a high yield without being affected by the presence of parts or indentations.

  In such a method, in a bottle mold having a shape having a constriction forming part or a hollow forming part in the axial direction, the appearance of the mold is obtained by connecting two or more holes that are formed straight from the outer surface of the mold. Another feature is that the constriction forming part or the hollow forming part is provided with a cooling passage which is followed by a bent part formed by connecting holes, and the cooling passage has at least one ventilation port and one exhaust port on the outer surface of the mold. The bottle forming mold can be easily and inexpensively manufactured simply by connecting two or more holes formed straight from the outer surface thereof in a desired path.

  The bottle molding die cooling method according to the present invention is also a bottle molding die cooling method in which the mold being molded is cooled by vertical ventilation at a plurality of locations in the circumferential direction. The most basic feature is that it is performed through a path substantially following the non-straight shape in the axial direction.

  In such a configuration, it is necessary for each part of the non-straight shape in the axial direction of the appearance surface to cool the bottle mold by ventilation in a path that substantially follows the non-straight shape in the axial direction of the appearance surface. Directly from a position close to a certain level, therefore, cooling that reflects well the set cooling conditions is realized, and the degree of proximity is determined in the circumferential direction in addition to the temperature distribution in the axial direction, regardless of whether it is a rough mold or a finish mold. Therefore, the temperature distribution in the circumferential direction can be sufficiently controlled, and bottles can be manufactured with good yield even for ultra-light bottles or bottles with high required accuracy.

  Such a method comprises a cooling die that has a non-straight appearance surface in the axial direction and that has a cooling passage that substantially follows the non-straight shape in the axial direction of the appearance surface of the die. Can be realized by using a bottle forming die having a basic feature of having at least one each on the outer surface of the die.

The shape of the mold has a different diameter, and the number of cooling passages in the circumferential direction by the path portion corresponding to the small diameter portion is less than that of the path portion corresponding to the larger diameter portion for cooling. According to the further configuration to do,
The number of cooling passages in the circumferential direction can be made smaller than that in the large-diameter portion so that the cooling portion approaches the small-diameter portion of the figure and approaches in the circumferential direction.

  In such a method, the mold surface has a different diameter, and the cooling passage has the number of paths in the circumferential direction of the portion corresponding to the small-diameter portion of the mold surface, and the circumference of the portion corresponding to the large-diameter portion. This is achieved by using a bottle mold that is smaller than the number of directions.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in combination in various combinations as much as possible.

  According to one aspect of the present invention, cooling is performed under the cooling conditions set for each non-straight portion in the axial direction of the appearance surface, and the temperature distribution in the axial direction is determined regardless of whether it is a rough mold or a finishing mold. Of course, by varying the degree of approach in the circumferential direction, the temperature distribution in the circumferential direction can be sufficiently managed, and bottles can be manufactured with high yield even with ultra-light bottles or bottles with high required accuracy.

  According to another feature of the present invention, cooling is performed under a cooling condition set for each non-straight shape part having a constriction forming part and a hollow forming part in the axial direction of the mold surface, and a rough mold or Regardless of the finish type, not only the temperature distribution in the axial direction but also the temperature distribution in the circumferential direction can be sufficiently controlled by making the degree of approach different in the circumferential direction, and it is superfluous without the influence of the presence of the constricted part or the recessed part. Even lightweight bottles and bottles with high accuracy can be manufactured with good yield.

  According to another feature of the present invention, cooling is performed under the cooling conditions set for the constriction forming portion or the hollow forming portion in the axial direction of the mold appearance surface, regardless of whether the rough die or the finishing die is in the axial direction. The temperature distribution in the circumferential direction is sufficiently controlled by varying the degree of proximity in the circumferential direction as well as the temperature distribution of the ultra-light bottle and the bottle with high required accuracy without the influence of the presence of the constricted part or the recessed part. But it can be made with good yield.

  According to the basic features of the bottle forming mold of the present invention, cooling is performed under the cooling conditions set for each non-straight shape part in the axial direction of the mold surface, regardless of whether it is a rough mold or a finished mold. In addition to the temperature distribution in the axial direction, the temperature distribution in the circumferential direction can be sufficiently managed by making the degree of proximity different in the circumferential direction, making it possible to produce bottles with high yield even with ultra-light bottles or bottles with high required accuracy. it can.

The shape of the mold has a different shape, and cooling is performed by reducing the number of cooling points in the circumferential direction by the path portion corresponding to the small diameter portion smaller than that of the path portion corresponding to the larger diameter portion. According to a further configuration,
It is possible to adjust the cooling portion to approach the small-diameter portion of the appearance surface and close in the circumferential direction so that the cooling is excessive.

  Hereinafter, the cooling method of the bottle mold according to the present invention and the embodiment of the bottle mold used therewith will be described in detail together with some examples with reference to FIGS. 1 to 6 for the understanding of the present invention. The following description and illustrations are specific examples of the present invention and do not limit the contents described in the claims.

  The cooling method of the bottle forming mold according to the present embodiment is different from the finishing mold 1 shown in FIGS. 1 and 2, the rough mold 2 shown in FIGS. 3 to 6, and the finishing mold 1 shown in FIGS. It is effective to apply regardless of the difference in the shape of the appearance surface 1a and the difference in the appearance surfaces 2a of the rough molds 2 shown in FIGS. For these various differences, the present invention generally has the example shown in FIG. 1, the example shown in FIG. 2, the example shown in FIG. 3, the example shown in FIG. 4, the example shown in FIG. As shown in the figure, the finishing mold 1 or the rough mold 2 which is a bottle forming mold being molded is cooled by aiming at the vertical ventilation 3 indicated by solid or broken arrows at a plurality of locations in the circumferential direction. In particular, this ventilation 3 is performed through a path 5 substantially following the non-straight shape in the direction of the axis 4 of the appearance surfaces 1a and 2a of the finishing die 1 and the rough die 2. As the ventilation 3, any conventionally known blowing mechanism can be adopted, and cooling air may be blown as described in Patent Documents 1 and 2. Of course, it is possible to use a newly developed air blowing mechanism.

  Thus, to cool the finishing mold 1 and the rough mold 2 which are bottle molding dies, the air flow 3 in the path 5 substantially following the non-straight shape in the direction of the axis 4 of the surface 1a, 2a 1a, 2a in the direction of the axis 4 in the direction of the non-straight shape as close as necessary, that is, the degree of direct from the position close to that in the case of the conventional cooling passage parallel to the axis 4 Therefore, it is possible to realize cooling that is well reflected by the cooling conditions set by the difference in the diameter and shape of the cooling passage 6 and the flow rate, flow velocity, and temperature of the cooling air in the ventilation 3 to the cooling passage 6. As a result, regardless of whether the rough mold 2 or the finishing mold 1 is used, not only the temperature distribution in the direction of the axis 4 but also the temperature distribution in the circumferential direction can be sufficiently controlled by making the degree of approach different in the circumferential direction, and the ultralight bottle Even high-precision bottles can be made with good yield. Such a method is used in various finishing molds 1 and rough molds 2 as shown in FIGS. 1 to 6 having non-straight appearance faces 1a and 2a in the direction of the axis 4, and in the direction of the axes 4 of the appearance faces 1a and 2a. The cooling passage 6 has a path 5 that substantially follows the non-straight shape in FIG. 1. This cooling path 6 has at least one ventilation port 6a and exhaust port 6b on the outer surface of the finishing mold 1 and the rough mold 2 respectively. It can be realized using a mold.

  Specifically, for example, by using three straight holes 11, 12, and 13 as shown in FIG. 1 using various connections of two or more holes that are drilled straight from the outer surface of the finishing mold 1 or the rough mold 2. Utilizing the connection, utilizing the connection by the two straight holes 14 and 15 as shown in FIG. 2, and utilizing the connection by the two straight holes 16 and 17 shown in FIG. 4 using the connection by the two straight holes 18, 19 shown in FIG. 4, using the connection by the three straight holes 21, 22, 23 shown in FIG. 5, and the three straight holes shown in FIG. The ventilating 3 is used for cooling in the respective paths 5 that substantially follow the non-straight shape in the direction of the axis 4 of the appearance surfaces 1a and 2a using the connection of 24, 25, and 26. As a result, the non-straight shape in the direction of the axis 4 of the appearance surfaces 1a and 2a is obtained by the ventilation 3 in the simple path 5 that is substantially imitated by using a connection of two or more holes that are drilled straight from the outer surface of the mold. Cooling that directly reflects the set cooling conditions with a high degree of directness from a position close to the necessary degree with respect to each part is achieved. The number of straight hole connections can be variously set according to the number of required bends of the path 5 or the cooling passage 6 forming the path, and the non-straight shape in the direction of the axis 4 of the appearance surfaces 1a and 2a and how to do it. Moreover, what is necessary is just to select as needed according to how much it copies.

  As the finishing mold 1 and the rough mold 2 for achieving such a method, two or more finishing molds having a non-straight appearance surface 1a, 2a in the direction of the axis 4 can be opened straight from the outer surface of the mold. The axes of the mold appearance surfaces 1a and 2a by the connections such as the holes 11 to 13, the holes 14 and 15, the holes 16 and 17, the holes 18 and 19, the holes 21 to 23, and the holes 24 to 26 as described above. A cooling passage 6 that forms a path 5 that substantially follows the non-straight shape in four directions is provided, and the cooling path 6 may have at least one ventilation port 6a and at least one exhaust port 6b on the outer surface of the mold. And it can be manufactured at low cost. Of course, a straight hole having such a connection is made from the outer surface of the mold, and the necessary ventilation holes 6a and 6b are formed to obtain the ventilation holes 6a and 6b at desired positions on the outer surface of the mold. It is only necessary to close holes other than the mouth. In the example shown in FIG. 1, two holes 31 and 32 are provided, in the example shown in FIG. 5, one hole 33 is provided, and in the example shown in FIG. Each hole 34 is closed with a plug 35. The plug 35 may be a metal member stuffing that is durable and familiar, and can be driven in, swaged, screwed, welded, etc. as required.

  Further, the bottle molding die cooling method of the present embodiment includes two or more holes 11 to 13, holes 14 and 15, holes 16 and 17, holes 18, and the like that are straightly drilled from the outer surface of the mold. 19, the shape of the mold surface 1a, 2a substantially follows the non-straight shape in the direction of the axis 4 and is shown in the shape surface 1a of the finishing mold 1 in FIG. The constriction forming part 41a in the shoulder part 41 and the constriction forming part 42a in the body part 42 as shown in the figure 1a of the finishing mold 1 in FIG. 2, the rough mold 2 in FIG. 3, FIG. 4, FIG. The constriction forming portion 43a in the shoulder portion 43 as shown in the appearance surface 2a, or the recess forming portion (not shown) is cooled by performing the ventilation 3 in the path 5 followed by the bent portion 44 formed by connecting various holes.

  Thereby, with respect to the non-straight shape in the direction of the axis 4 of the appearance surfaces 1a and 2a, the two or more holes 11 to 13, the holes 14 and 15, the holes 16 and 17, and the hole 18 that are drilled straight from the outer surface of the mold 19, almost following the connection such as the holes 21 to 23 and the holes 24 to 26, and bending due to the connection between the holes to the constriction forming portions 41a, 42a, 43a of the appearance surfaces 1a and 2a or the recess forming portions. Due to the ventilation 3 in the simple path 5 that is imitated by the portion 44, each of the non-straight-shaped portions having the constriction forming portions 41a, 42a, 43a and the hollow forming portions in the direction of the axis 4 of the appearance surfaces 1a, 2a. It is possible to realize cooling that reflects the set cooling conditions with a high degree of directness from a position close to the necessary degree. Therefore, regardless of whether the rough mold 2 or the finishing mold 1 is used, not only the temperature distribution in the direction of the axis 4 but also the temperature distribution in the circumferential direction can be sufficiently managed by varying the degree of proximity in the circumferential direction, and the constriction forming portion 41a. , 42a, 43a and the presence of the indented portion, it is possible to produce a bottle with a high yield even with an ultralight bottle or a bottle with high required accuracy. In particular, the constriction forming portion 43a and the indentation portion of the shoulder portion 43 tend to be insufficiently cooled against being heated for a long time because the gob which is the molding material in the rough mold 2 comes into contact quickly and locally. It is possible to eliminate the tendency to cause top tilt and sag. Further, the constriction forming portion 42a and the indented portion of the body portion 42 are likely to cause the above-described chatter due to insufficient cooling, and it is possible to eliminate the necessity of applying the release agent and the adverse effects caused by it.

  Also in such a method, in the finishing die 1 or the rough die 2 as the bottle forming die having the non-straight appearance surfaces 1a and 2a in the direction of the axis 4, the two or more holes 11 can be made straight from the outer surface of the die. ˜13, holes 14 and 15, holes 16 and 17, holes 18 and 19, holes 21 to 23, holes 24 to 26, almost imitating the non-straight shape in the axis 4 direction of the appearance surfaces 1a and 2a, Further, the constriction forming portions 41a, 42a, 43a or the hollow forming portions of the appearance surfaces 1a and 2a are provided with a cooling passage 6 which forms a path 5 followed by a bent portion 44 formed by connecting holes, and this cooling passage 6 is a vent hole This can be achieved by a simple finishing die 1 or rough die 2 having at least one 6a and at least one exhaust port 6b on the outer surface of the die. Such finishing die 1 and rough die 2 can be easily and inexpensively. Can be produced.

  Further, as shown in FIG. 1, the constriction forming portion 41a viewed only in the shoulder portion 41 is a small diameter portion with respect to the body portion 42 which is a large diameter portion, and the bent portion 44 following the constriction forming portion 41a is With respect to the hole 11 that follows the body portion 42, the hole 12 that extends to the inner diameter side and the hole 13 that rises from the inner end of the hole 12 are formed. 13 and the circumferential interval between the bent portions 44 is reduced as shown in FIG. For this reason, the temperature management of the constriction forming portion 41a by the bent portion 44 in the path 5 and the cooling passage 6 tends to be excessive, and the appearance surface 1a has the different diameter shape as described above and corresponds to the small diameter portion. Cooling is performed by reducing the cooling portion in the circumferential direction by the bent portion 44 as an example of the path 5 portion to be smaller than that of the hole 11 as an example of the path 5 portion corresponding to the larger diameter portion. . Accordingly, the number of cooling points in the circumferential direction is less than that in the large-diameter portion by approaching the small-diameter portion such as the appearance surface 1a and approaching in the circumferential direction by this, so that the cooling becomes excessive alone or It can be adjusted in cooperation with the cross-sectional area of the path 5 and the like. For this purpose, in the finishing die 1 having the appearance surface 1a having a different diameter in the direction of the axis 4, the cooling passage 6 corresponds to a small diameter portion such as the appearance surface 1a as illustrated in FIG. The number of circumferential paths 5 may be smaller than the number of circumferential paths 5 in the portion corresponding to the large diameter portion.

  In addition, in the finishing die 1 of Example 1 shown in FIG. 1 according to the present embodiment, as shown in FIG. 1 (b), the bent portion 44 of the finishing die 1 is divided into two on the diameter line in plan view. A bent portion 44 is provided on a diameter line 52 at a position in the vicinity of the joint portion 51 in the circumferential direction and on a diameter line 54 at a position in the circumferential direction between the position in the vicinity of the circumferential direction and the diameter line 53 orthogonal to the joint portion 51. Each cooling passage 6 includes a cooling passage 6 that forms a straight path 5 with only holes 11 having no gaps, and each cooling passage 6 has a substantially close arrangement pitch between the diameter lines 52 on both sides with a diameter line 53 that is an intermediate position therebetween. It is provided.

  Corresponding to the ventilation 3 being performed in the direction of the solid arrow, the upper end diameter near the downstream side of the hole 11 is the small-diameter portion 11b on the upstream side and the large-diameter portion 11a having a larger diameter than that. The cooling air is expanded to reduce the flow rate by a predetermined rate so that the contact time with the finishing die 1 is increased. That is, the cooling effect is compensated for the temperature rise as the cooling air supplied to the ventilation 3 reaches the downstream side. On the other hand, the holes 12 and 13 forming the bent portion 44 are made smaller in diameter than the large-diameter portion 11a so as to have a throttling effect, thereby increasing the flow velocity of the cooling air here and acting opposite to the large-diameter portion 11a. I am doing so. Furthermore, the diameter of the cooling passage 6 adjacent to the diameter line 52 is made smaller than the diameters of the other cooling passages 6.

  As described above, the degree of cooling in the direction of the axis 4 and the circumferential direction corresponding to the shape of the appearance surface 1a of the finishing die 1 and the adjacent and non-adjacent portions of the finishing dies 1 are variously adjusted. In particular, the arrangement of the bent portion 44 near the joint portion 51 is effective in preventing shoulder and lower step bills. However, if necessary, the cooling passage 6 is formed of a straight hole 11 or the like that is opened from the outer surface of the mold regardless of the presence or absence of the bent portion 44. Therefore, it is easy to provide a diameter-reduced portion as well as a diameter-reduced portion in the middle. It is. For example, the diameter-enlarged portion can be made to have an inner diameter smaller than that of the expanded-diameter portion by drilling with a diameter corresponding to the expanded-diameter portion and then inserting a pipe on the downstream side and upstream side where the expanded-diameter portion is desired.

  In the finishing mold 1 of the second embodiment shown in FIG. 2, the same difference in diameter as in the embodiment shown in FIG. 1 and the cooling passage 6 are provided in the circumferential direction with the arrangement, but the diameter of the constriction forming portion 42a is illustrated. Since it has a larger diameter than the one constriction forming portion 41a, it differs from that of FIG. 1 in that the bent portions 44 are formed in all the cooling passages 6. However, if necessary, the cooling passage 6 having the bent portion 44 and the cooling passage 6 that is not so may be arranged in the circumferential direction. The diameter of the bent portion 44 may be larger or smaller than its upstream side and downstream side.

  Here, the finish mold 1 of the embodiment 1 shown in FIG. 1 in the present embodiment and the finish mold as a comparative example having no bent portions 44 by the holes 12 and 13 in the embodiment 1 of FIG. Tables 1 and 2 below show the results obtained by measuring and comparing the temperature at the outer peripheral portion A of the constriction forming portion 41a at the joint portion 51 opened later and the degree of inclination of the top surface of the molded bottle.

肩部の温度については表１に示す通り、実施例１は比較例に比して明らかに低く抑えられている。天面傾斜は天面傾斜の発生は天候や気温にも左右され、それぞれの測定日に違いがあって一概に言えないものの、押しなべて実施例１は比較例に比して天面傾斜が軽減しているといえ、表１での温度差が反映したものといえる。

As shown in Table 1, the shoulder temperature is clearly lower in Example 1 than in the comparative example. Although the top slope is affected by the weather and temperature, the top slope is affected by the weather and temperature, and there is a difference between the measurement dates. It can be said that the temperature difference in Table 1 is reflected.

  Example 3 shown in FIG. 3 and Example 4 shown in FIG. 4 are both in the case of the rough mold 2, but the formed parison is cantilevered by the molded mouth mold and the mouth mold is used. Because the reversing swing of the reversing arm that has it is inverted from the inverted state to the upright state and transferred to the finishing mold 1 for finish molding, the bottom side is outside the swing diameter under the influence of inertia during the reversing swing This tends to cause unevenness in the thickness in the direction of the axis 4 and the circumferential direction during finish molding. In particular, since the deformation force acts strongly on the shoulder portion 43, the temperature of the shoulder portion 43 of the molded parison is important to oppose this. Therefore, as the temperature of the shoulder portion 43 of the rough mold 2 is kept low, deformation at the time of reversal can be prevented. However, when it is cooled too much, the formability when the molded parison is transferred to the finishing mold and finish-molded is lowered.

  Therefore, even in the rough mold 2, the temperature control of the neck portion 43 a including the shoulder portion 43, in particular the countermeasure for the inclination of the top surface and the sag, is delicate, but in the past, the temperature control was not completely performed. 2a, particularly the path 5 or the cooling passage 6 substantially following the constriction forming portion 43a in the direction of the axis 4 on the appearance surface 2a, in particular, the path 5 or the cooling passage 6 having the bent portion 44 substantially following the constriction forming portion 43a. As a result, the temperature can be controlled sufficiently.

  In Example 3 of FIG. 3, the inclination angle with respect to the axis 4 of the hole 19 that almost follows the most part other than the shoulder 43 of the appearance surface 2a is 5 °, and in Example 4 of FIG. When the average value of the circumferential wall thickness at the shoulder 43 and under the neck was measured, in the comparative example of the conventional form in which a hole was made straight in parallel to the axis 4 from the same position as the hole 19, it was 2.75 mm at the neck. In Example 3, the neck was 2.24 mm, the neck was 2.93 mm, the neck was 2.39 mm, the neck 4 was 3.01 mm and the neck was 2.41 mm. The wall thickness was able to be secured. In addition, the result of Example 4 is better than that of Example 3, and the bent portion 44 is closer to the constriction forming portion 43a of the face 2a than the case of Example 3. Seems to reflect.

  Example 5 of FIG. 5 and Example 6 of FIG. 6 are different from the example of FIG. 4 in that the joint part of the rough mold 2 is poorly cooled, and the joint corresponding part in the circumferential direction of the bottle is It corresponds to the tendency that the wall thickness tends to be thin. In particular, the combination of the three holes 21 to 23 and 24 to 26 is closer to the appearance surface 2a and more nearly parallel to each other. To further promote the cooling of In particular, Example 6 is closer to and more parallel to the appearance surface 2a than Example 5, which further enhances the cooling effect.

  INDUSTRIAL APPLICABILITY The present invention can be practically used for roughing and finishing molds of bottle machines such as IS machines, can improve the molding accuracy and yield of bottles, and is effective for molding ultra-light bottles.

It is the top view and joint part front view which show the finishing type | mold as one Example which concerns on embodiment of this invention. It is the top view and joint part front view which show the finishing type | mold as another Example which concerns on embodiment of this invention. It is a joint part front view which shows the rough type | mold as another Example which concerns on embodiment of this invention. It is a joint part front view which shows the rough type | mold as another example which concerns on embodiment of this invention. It is a joint part front view which shows the rough type | mold as another Example based on embodiment of this invention. It is a joint part front view which shows the rough type | mold as another one Example based on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Finish type | mold 2 Rough type | mold 1a, 2a Form surface 3 Ventilation 4 Axis 5 Path | route 6 Cooling passage 11-11, 21-26 Hole 35 Plug 41 Shoulder part 41a Constriction formation part 42 Trunk part 42a Constriction formation part 43 Shoulder part 43a Constriction formation Part 44 bent part

Claims (10)

In the cooling method of the bottle forming die that cools the die being formed by aiming the vertical ventilation at a plurality of locations in the circumferential direction,
A bottle molding characterized in that it cools by ventilating in a path that substantially follows the non-straight shape in the axial direction of the mold surface, using a connection of two or more holes that are drilled straight from the outer surface of the mold Mold cooling method. In the cooling method of the bottle forming die that cools the die being formed by aiming the vertical ventilation at a plurality of locations in the circumferential direction,
Using the connection of two or more holes that are drilled straight from the outer surface of the mold, it closely follows the non-straight shape in the axial direction of the mold appearance surface, and the constriction formation portion or the depression formation portion of the mold appearance surface A cooling method for a bottle forming die, wherein the cooling is performed by passing the air in a path followed by a bent portion formed by a connection between holes. In the cooling method of the bottle forming die that cools the die being formed by aiming the vertical ventilation at a plurality of locations in the circumferential direction,
Using the connection of two or more holes that are drilled straight from the outer surface of the mold, cooling by performing the above-mentioned ventilation in the path where the bent part of the constriction forming part or the recessed part forming part of the mold surface follows the connecting part A method for cooling a bottle mold, characterized by: In the cooling method of the bottle forming die that cools the die being formed by aiming the vertical ventilation at a plurality of locations in the circumferential direction,
The bottle molding die cooling method, wherein the ventilation is performed along a path substantially following the non-straight shape in the axial direction of the mold surface. The shape of the mold has a different diameter, and cooling is performed by reducing the number of cooling points in the circumferential direction by the path corresponding to the small diameter part less than that of the path corresponding to the larger diameter part. The method for cooling a bottle mold according to any one of claims 1 to 4. In a bottle mold that has a non-straight appearance in the axial direction,
A cooling passage that substantially follows the non-straight shape in the axial direction of the mold appearance surface is formed by a connection of two or more holes that are drilled straight from the outer surface of the die, and this cooling passage has at least one ventilation port and exhaust port. A bottle mold characterized by having it on the outer surface of each mold. In a bottle mold that has a non-straight appearance in the axial direction,
By connecting two or more holes that are drilled straight from the outer surface of the mold, it almost follows the non-straight shape in the axial direction of the mold surface, and there is no hole in the constriction or indentation part of the mold surface. A bottle forming die comprising a cooling passage that follows a bent portion due to the connection, and the cooling passage has at least one ventilation opening and one exhaust opening on the outer surface of the mold. In a bottle mold having a shape with a constriction forming part or a hollow forming part in the axial direction,
There is a cooling passage in which the bent portion of the constriction forming portion or the hollow forming portion of the form surface of the die follows the connecting portion of two or more holes that are drilled straight from the outer surface of the die, and this cooling passage is a vent hole And at least one exhaust port on the outer surface of the mold. In a bottle mold that has a non-straight appearance in the axial direction,
A bottle forming die comprising a cooling passage substantially following the non-straight shape in the axial direction of the mold surface, wherein the cooling passage has at least one ventilation port and one exhaust port on the outer surface of the die. The mold surface has a different diameter, and the cooling passages correspond to the number of cooling passages in the circumferential direction of the part corresponding to the small diameter part of the mold surface, corresponding to the larger diameter part. The bottle molding die according to any one of claims 6 to 9, wherein the bottle forming die is smaller than that of the path portion.

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