JP2006315189A - Mold moving type blow molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biaxially stretching blow molding machine suitable for incorporating a mounting mechanism or the like of an in-mold part such as a label, a handle or the like. <P>SOLUTION: In the work station 7 and blow molding station 8 of the biaxially stretching blow molding machine 1, a rotary table 46 is loaded with a pair of blow molds 41 and the label 4 is mounted in each of the blow molds 41 at a work position 61. Each of the blow molds in which the labels are mounted is moved to the place just above a blow molding position 14 by the rotary table 46 and a preform 2 set to a temperature state suitable for blow molding is positioned at the blow molding position 14 to be allowed to stand by. Each of the blow molds 41 is allowed to fall and the preform 2 is mounted in each of the blow molds 41 to be subjected to blow molding to mold a container 3 having the label 4 bonded and fixed to its outer peripheral surface. By moving the blow molds 41, the small-sized compact biaxially stretching blow molding machine enabling the in-mold molding of the label, the handle or the like can be realized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a blow molding method for producing a blow molded container such as a beverage container by blow molding a preform heated to a predetermined temperature. More specifically, the present invention relates to a blow molding method suitable for in-mold molding of a label, a handle, and the like.

  A beverage container or the like is manufactured by heating a preform or parison that has been injection-molded in advance to a predetermined temperature and then blow-molding it. In the blow molding apparatus used for this purpose, the preform is transported while being heated to a temperature state suitable for blow molding, and then the heated mold is placed on the blow mold waiting in a mold open state at a fixed position. Reform is put in and blow molding is performed. In order to perform blow molding efficiently, place multiple blow molds on the turntable and circulate the blow mold along a circular movement path while feeding the preform, clamping, blow molding, and mold opening. A rotary type that repeatedly discharges blow molded products is also known.

  Here, in blow molded containers such as beverage containers, a label made of a heat-shrinkable film or the like may be attached to the outer peripheral surface after blow molding. In a large container or the like, a handle manufactured by injection molding or the like may be attached to the container body after blow molding. It is desirable to attach the parts such as the label and the grip by in-mold molding in which the preform is blow-molded in a state where these are previously mounted on the blow-molding die, because the production efficiency is improved.

  In order to attach components such as a label and a handle to the blow molding container by in-mold molding, it is necessary to arrange a mechanism for mounting the in-mold components in the blow molding die adjacent to the blow molding die. . However, a preform supply path, a compressed air supply mechanism for blow molding, a drive mechanism for a stretching rod, and the like are installed at a place where the blow mold is installed. Therefore, it is difficult to secure a space for installing a mechanism for mounting in-mold parts without increasing the size of the apparatus.

  In the case of a rotary blow mold, it is necessary to mount an in-mold component on each blow mold that is moving along a circular movement locus. It is difficult to mount the component on the moving blow mold, and in particular, it is difficult to mount the component accurately on a predetermined part in the moving blow mold.

  In view of these points, an object of the present invention is to propose a blow molding method suitable for incorporating a mounting mechanism for in-mold parts such as a label and a handle.

In order to solve the above problems, the blow molding method according to the present invention is:
A preform conveying step for conveying a preform heated to a temperature suitable for blow molding to a blow molding position;
A preform standby step of waiting at the blow molding position the preform that has reached the blow molding position;
A blow mold moving step for moving the blow mold to the blow molding position and forming a state where the standby preform is mounted on the blow mold;
A blow molding step of blow molding the preform in the blow mold to form a blow molded container;
A blow molding die returning step of returning the blow molding die from the blow molding position to the standby position.

  In the blow molding method according to the present invention, the preform is fixed at the blow molding position, the blow mold is moved from the standby position to the blow molding position where the preform is waiting, and the preform is mounted on the blow mold. I am doing so. In this way, if the blow mold is moved, a mechanism for mounting in-mold parts such as labels and handles on the blow mold at a standby position of the blow mold away from the blow molding position is installed. can do. Moreover, since it is only necessary to mount the in-mold parts on the blow mold that is stopped at the standby position, the mounting operation is easy, and it is also possible to accurately mount the parts in the target blow mold. .

  Generally, an operation process such as mounting an in-mold part on a blow mold may be performed on the blow mold that has returned to the standby position.

  Also, a plurality of blow molds are prepared as the blow mold, and the blow molding process for one blow mold and the work process for another blow mold are performed in parallel, It is desirable that the blow mold moving process, the blow molding process, the blow mold returning process, and the work process are repeatedly performed on the blow mold.

  Further, as the blow mold, a plurality of blow mold groups each including a plurality of blow molds are prepared, the blow mold process for one blow mold group, and the work process for another blow mold group. It is desirable to repeat the blow molding process and the work process for each blow molding die group.

  Next, it is possible to perform work other than mounting work for in-mold parts as the work process. That is, the blow molding method of the present invention includes a heating step of heating the blow molding die to a predetermined temperature prior to the blow molding step, and in the blow molding die returning step, The blow molded container is returned to the standby position while being held in the blow mold, and in the work process, the blow molded container is cooled by blowing compressed air into the blow molded container, and then the blow molded container is blow molded. It is characterized by taking out from the mold.

  On the other hand, as the preform, generally, a bottomed cylindrical one having one end opened as a mouth is used. In the preform conveying step, the preform standby step, and the blow molding step, the preform may be held in an inverted posture with the mouth portion facing downward or with the mouth portion facing up.

  In this case, in order to convey the preform, a preform fixing mandrel having an insertion core that can be inserted into the mouth of the preform can be used.

  Further, as the blow mold, a cylindrical mold having an open end can be used. In this case, in the blow mold moving step, the cylindrical mold is raised or lowered, The preform is positioned and the end surface of the cylindrical mold is brought into contact with the preform fixing mandrel to form a clamped state.

  As the blow mold, a pair of open / close molds that can be opened and closed to the left and right can be used. In this case, in the blow mold moving step, the open / close mold in the opened state is raised or lowered, the preform is positioned between them, and then the open / close mold is closed and the mold is clamped. May be formed.

  In the blow molding method according to the present invention, the blow molding die is moved to a blow molding position where the preform is waiting to form a state where the preform is mounted on the blow molding die. Therefore, it is possible to perform an operation of mounting the in-mold component at a predetermined position inside the blow mold at a position away from the blow molding position. As a result, the installation space for the mechanism for performing such work can be ensured without increasing the size of the apparatus.

  In addition, when using a plurality of blow molding dies, during the blow molding with one blow molding die, mounting work of parts to other blow molding dies that are stopped at a standby position away from the blow molding position, etc. It can be performed. Therefore, it is possible to realize a compact blow molding apparatus that can perform operations other than blow molding in parallel without reducing production efficiency.

  Embodiments of a biaxial stretch blow molding apparatus to which the present invention is applied will be described below with reference to the drawings.

(overall structure)
FIG. 1 is a plan view of the biaxial stretch blow molding apparatus of this example, and FIG. 2 is a side view thereof. The biaxial stretch blow molding apparatus 1 is for producing a bottomed cylindrical container 3 by biaxially stretching and blowing a cup-shaped preform 2. The label 4 is bonded and fixed by molding. The preform 2 includes a mouth portion 2a having a male screw portion formed on the outer peripheral surface, and this mouth portion 2a remains as the mouth portion 3a of the container 3 without being stretched and blown. Portions other than the mouth 2a of the preform 2 are biaxially stretched and blown to form a cylindrical body 3b and a bottom 3c continuous with the mouth 3a of the container 3.

  The biaxial stretch blow molding apparatus 1 includes a preform 2 supply station 5, a heating station 6 for heating the preform 2 to a temperature suitable for blow molding, and a label 4 for in-mold molding in a blow mold. A work station 7 for mounting the label, a blow molding station 8 for performing biaxial stretch blow molding of the heated preform 2 in a blow mold to which the label 4 is mounted, and a recovery for recovering the molded container 3 Station 9.

  The preform 2 supplied from the supply station 5 is carried on the preform fixing mandrel 10 with the mouth portion 2a turned upside down. The preform fixing mandrel 10 carrying the preform 2 circulates in a substantially horizontal circulation path passing through the stations.

  The circulation path of the preform fixing mandrel 10 includes a supply path 12 extending linearly from a supply position 11 to which the preform 2 is supplied from the supply station 5 and an elongated U shape arranged along the heating station 6. The heating path 13, the linear conveyance path 15 for conveying the heated preform 2 to the blow molding position 14 of the blow molding station 8, and the molded container 3 are discharged from the blow molding station 8 and collected. A U-shaped return path 17 for returning the empty preform fixing mandrel 10 to the preform supply position after delivery to the collection station 9 at the position 16 is provided. Further, the supply path 12 and the heating path 13 are connected by a transfer path formed by star wheels 18 and 19 in which semicircular grooves are formed on the outer peripheral surface. Similarly, the heating path 13 and the transport path 15 are also connected by a transfer path formed by the star wheel 21.

  In the preform 2 supply station 5, the preform 2 put into the hopper 31 is transported upward by the belt conveyor 32, and then falls onto the chute 33 from the upper end. While the chute 33 is moved, the preforms 2 are aligned one by one in the upright posture with the mouth portions 2a being in the upright posture, and in this state, the preform 2 is handed over to the slide rail 34. The preform 2 slides down along the slide rail 34. A reversal supply mechanism 35 for supplying six preforms 2 to the supply path 12 side is disposed at the lower end of the slide rail 34. The inversion supply mechanism 35 holds the six preforms 2 arranged at regular intervals, and with respect to the six preform fixing mandrels 10 waiting at the supply position 11 of the adjacent supply path 12, Insert from the top in an inverted state with the 180-degree posture reversed.

  The preform fixing mandrel 10 has a through hole 10a formed at the center, and an upper end of the mandrel 10 is an outer diameter core 10b that can be inserted into the mouth portion 2a of the preform 2, and is formed on the outer peripheral surface of the lower end of the core 10b. Has a large-diameter flange 10c. A large-diameter flange 10e for sliding is formed on the outer peripheral surface of the cylindrical portion 10d extending from the lower end of the core 10b.

  The preform fixing mandrel 10 into which the preform 2 is inserted is fed forward by a feed mechanism (not shown). The delivered preform fixing mandrels 10 are sequentially delivered to the rotating star wheel 18 one by one, and are transferred to the heating path 13 via the star wheel 19. In the heating station 6 through which the heating path 13 passes, heating sources such as heating lamps are arranged at a plurality of locations along the heating path 13. While being conveyed along the heating path 13, the preform 2 is heated to a predetermined temperature.

  The heated preform 2 is delivered to the conveyance path 15 together with the preform fixing mandrel 10 and passes through this to the blow molding position 14 of the blow molding station 8 in a temperature state suitable for blow molding. The preform 2 that has reached the blow molding position 14 waits for the blow mold 41 to move at that position. After the blow mold 41 is moved to the blow molding position 14 and the mold 2 is clamped with the preform 2 mounted therein, biaxial stretch blow molding is performed. Note that before the preform 2 reaches the blow molding position, the blow mold 41 may be moved to stand by directly above or below the blow molding position.

  After the blow mold 41 is moved after blow molding, the molded container 3 is discharged while being held on the preform fixing mandrel 10 and is pulled out from the preform fixing mandrel 10 at the collection position 16. Then, it is collected on the collection station 9 side. The preform fixing mandrel 10 emptied moves along the return path 17 and returns to the supply position 11 again, so that a new preform 2 is supplied.

(Blow molding station and work station)
FIG. 3 is a plan view of the blow molding station 8 and the label mounting work station 7, and FIG. 4 is a schematic sectional view thereof. FIG. 5 is an explanatory view showing a blow molding operation.

  The structure of the stations 7 and 8 will be described with reference to these drawings. A horizontal substrate 43 is attached to the apparatus base 1a, and four vertical columns 44 are erected on the horizontal substrate 43, and a rectangular horizontal frame plate 45 is supported on the upper ends thereof. A circular opening 45a is formed in the horizontal frame plate 45, and an annular step surface facing upward is formed on the inner peripheral edge of the horizontal frame plate 45, and a circular turntable 46 is rotatably mounted from above. Has been. The turntable 46 is restricted from moving upward by stoppers 47 at a plurality of locations so as not to be disengaged upward.

  The upper end of the vertical rotation shaft 48 is fixed to the center of the lower surface of the turntable 46. The vertical rotation shaft 48 is rotatably supported by a cylindrical bearing member 49 attached to the horizontal substrate 43. A servo motor 50 is attached to the back surface of the horizontal substrate 43, and the rotation of the servo motor 50 is transmitted to the vertical rotation shaft 48 via a reduction mechanism (not shown).

  Two sets of blow mold assemblies 51 are mounted on the rotary plate 46 at both ends in the diameter direction in a point-symmetric state. The blow mold assembly 51 is perpendicular to the lower surface of a blow mold lifting / lowering cylinder 52 supported by the rotating plate 46 and a lifting plate 54 attached horizontally to the lower end of the lifting / lowering rod 53 of the blow mold lifting / lowering cylinder 52. And a blow mold 41 attached to the. The blow mold 41 is a mold for six pieces, and six blow molding cavities 55 are formed at regular intervals, and each cavity 55 opens downward.

  By rotating the turntable 46, the blow mold 41 of the blow mold assembly 51 can be positioned directly above the blow molding position 14. In the positioning state, the six preforms 2 waiting at the blow molding position 14 are positioned directly below the cavities 55 of the blow mold 41, respectively. When the blow mold 41 is lowered, a state in which the preform 2 is mounted in each cavity 55 is formed. Further, a mold clamping state is formed in which the lower end surface 411 of the blow mold 41 is in close contact with the upper surface of the flange 10c of each preform fixing mandrel 10 carrying the preform 2.

  In addition, six compressed air outlets 56 are arranged on the lower side of the blow molding position 14, and the extending rods 57 arranged vertically can project upward through the compressed air outlets 56. It has become. Each stretching rod 57 is moved up and down by a stretching rod lifting cylinder 58 attached to the back surface of the horizontal substrate 43. In a state where the six preform fixing mandrels 10 carrying the preform 2 are waiting at the blow molding position 14, each mandrel 10 is positioned immediately above the compressed air outlet 56. At the time of blow molding, the compressed air blowing port 56 rises and comes into close contact with the lower end of the mandrel 10, and compressed air is blown into the preform 2 through the central through hole 10 a of the mandrel 10. The stretching rod 57 also stretches the preform 2 through the central through hole 10 a of the mandrel 10.

  Next, in a state where one blow mold assembly 51 is positioned directly above the blow molding position 14 as described above, the other blow mold assembly 51 is operated at the label mounting station 7 as a label mounting work position. It will be in the state positioned right above 61.

  As shown in FIG. 4, the label mounting station 7 includes a slide rail 62 mounted on the upper surface of the horizontal substrate 43, and a label mounting capable of reciprocating between the working position 61 and the retracted position 63 along the slide rail 62. The tool 64 is provided. The label mounting tool 64 includes six label mounting cores 65 that can be inserted into the six cavities 55 of the blow mold 41. The label 4 is attached to each label mounting core 65 at the retracted position 63.

  The label mounting tool 64 to which the label 4 is attached is sent to the working position 61 by a driving mechanism (not shown) and waits at that position. After the blow mold 41 is positioned right above the work position 61 by the rotation of the turntable 46, when the blow mold 41 is lowered by the blow mold lifting cylinder, the label mounting core 65 is inserted into each cavity from below. As a result, the label 4 carried on them adheres closely to the inner peripheral surface of the cavity. For example, a plurality of vacuum suction ports are formed in the cavity inner peripheral surface portion of the blow mold 41, and the label 4 is vacuum-sucked and is in close contact with the cavity inner peripheral surface. Thus, after the label 4 is mounted in each cavity, the blow mold 41 is raised.

  Next, with reference to FIG. 5, the operation | movement in the blow molding station 8 and the work station 7 is demonstrated collectively below.

  First, six preform fixing mandrels 10 carrying the preform 2 in a temperature suitable for blow molding are sent along the conveying path 15 to the blow molding station 8 and positioned at the blow molding position 14. Then, it is made to wait there (step ST1).

  In parallel with the preform conveying operation, a movement for positioning the blow mold 41 directly above the blow molding position 14 is also performed. When the turntable 46 rotates to the rotational position shown in FIGS. 3 and 4 and stops, the blow mold 41 of one blow mold assembly 51 is positioned directly above the blow molding position 14 (step ST2).

  Thereafter, the blow mold 41 is lowered to form a mold clamping state in which each preform 2 is mounted in each cavity (step ST3).

  Next, in the blow mold 41 on the blow molding station 8 side, the compressed air blow-out port 56 rises from the lower side and communicates with the central through hole 10 a of the mandrel 10, and the compressed air is transferred to the preform 2. At the same time, the stretching rod 57 rises and stretching of the preform 2 is started. In this way, biaxial stretching blow of the preform 2 is performed, and the container 3 is formed (step ST4).

  Here, a label 4 is mounted in advance on the molding surface in each cavity 55 of the blow mold 41 as will be described later. Therefore, the label 4 is bonded to the outer peripheral surface of the body portion of the container 3 by in-mold molding. Thereafter, after the compressed air is discharged, the stretching rod 57 is lowered, and then the blow mold 41 is raised (step ST5).

  Thereafter, the container 3 with the blow-molded label is discharged toward the collection station 9 (step ST6). Further, the heated preform 2 enters the blow molding position 14. Further, the turntable 46 rotates 180 degrees, and the blow mold 41 that has been raised right above the blow molding position 14 is moved to the label mounting position 61 on the opposite side.

  Before the blow mold 41 is positioned directly above the work position 61, the label mounting tool 64 to which the label 4 is supplied at the retracted position 63 is positioned at the work position 61 in the work station 7. (Step ST11). After positioning the blow mold 41 directly above the work position 61 (step ST12), the blow mold 41 is lowered, and the label mounting core 65 to which the label 4 is attached is inserted into each cavity 55 to label 4 is mounted in each cavity 55 (step ST13). For example, vacuum suction is applied to the inner peripheral surface of the cavity. Thereafter, the blow mold 41 is raised (step ST14), and the label mounting tool 64 is returned to the retracted position 63 (step ST15).

  Thereafter, the rotating plate 46 is rotated, and the blow mold 41 with the label 4 attached is moved toward the blow molding position 14 and positioned there (step ST2). During the movement of the blow mold 41, the label mounting station 7 performs an operation of supplying the label 4 to the label mounting tool 64 at the retracted position 63 (step ST16).

  As described above, biaxially stretched blow molding is performed on the pair of blow molds 41 while alternately repeating the blow molding process and the label mounting process, and six labeled containers 3 are manufactured. .

  In this example, a pair of blow molds 41 are mounted. For example, as shown in FIG. 6, four sets of blow molds 41 are mounted on a rotating disk 46 at 90 degree intervals, and are point-symmetric. The operation of performing blow molding on one of the two sets of blow molding dies 41 at the position and performing the label mounting operation on the other may be repeated.

(Embodiment 2)
FIG. 7 is a plan view and a schematic sectional view showing another embodiment of the above blow molding and work station, and FIG. 8 is an explanatory view showing the operation thereof. Since the basic configurations of the blow molding station 8A and the work station 7A of this example are the same as those shown in FIGS. 3 to 5, the corresponding parts are denoted by the same reference numerals, and description thereof is omitted.

  In the blow molding station 8A of this example, the pair of blow mold assemblies 51A mounted on the turntable 46 includes a pair of open / close molds 41a and 41b that open and close to the left and right, and open and close these open / close molds, respectively. Blow mold opening and closing cylinders 71a and 71b are provided. The blow molding operation is basically the same as the above example, but the left and right open / close molds 41a and 41b are positioned immediately above the blow molding position 14 to perform mold opening (step ST2A in FIG. 8). Thereafter, the mold is lowered in the mold open state (step ST3A in FIG. 8), and mold clamping and blow molding are performed (step ST4A in FIG. 8). It is also possible to lower the left and right open / close molds 41a and 41b with the mold closed, and to form a mold clamped state in which a preform is mounted from the lower side between them. After blow molding, after the mold opening is performed, the open / close molds 41a and 41b are raised in the mold open state (step ST5A in FIG. 8).

  In addition, the work station 7A of this example is not a label mounting work station, but performs a work of mounting the handle 4A on the blow mold 41A. An attachment tool 64A for attaching the handle 4A is provided, and the handle 4A is attached to a handle attachment core 65 formed there. The left and right open / close molds 41a and 41b of the blow mold 41A are positioned directly above the handle mounting work position 61, and after being lowered in this state, a mold clamping operation is performed, and the handle 4A is opened / closed 41a. Alternatively, it is attached to a predetermined part 41b.

  Note that three or more sets of blow molds 41A can be mounted on the rotating disk 46. For example, as shown in FIG. 9, four sets can be mounted at intervals of 90 degrees.

(Embodiment 3)
Next, FIG. 10 is a plan view and a schematic sectional view showing another embodiment of the above blow molding and work station, and FIG. 11 is an operation explanatory view thereof. Since the structure of the blow molding station of this example is the same as that shown in FIGS. 7 and 8, the corresponding parts are denoted by the same reference numerals, and description thereof is omitted.

  The work station 7B of this example has substantially the same configuration as the blow molding station 8A. Accordingly, corresponding parts are indicated by the same reference numerals. In the work station 7B, blow molding is performed again on the molded product 3A molded in a shape almost similar to the final product in the blow molding station 8A, and the molding accuracy of the container 3 as the final product is improved, and / or Alternatively, heat resistance is improved.

  With reference to FIG. 11, the operation | movement in the blow molding of this example and a work station is demonstrated. In this example, the blow mold 41A is always kept in a heated state of 100 ° C. or higher and 180 ° C. or lower. First, the six preform fixing mandrels 10 carrying the preform 2 in a temperature suitable for blow molding are sent along the conveying path 15 to the blow molding station 8A and positioned at the blow molding position 14. Then, it is made to wait there (step ST31).

  In parallel with the preform conveying operation, a movement for positioning the blow mold immediately above the blow molding position 14 is also performed. When the turntable 46 is rotated to the rotational position shown in FIG. 10 and stopped, the blow mold of one blow mold assembly 51 is positioned immediately above the blow molding position 14 and the mold is opened (step ST32).

  Thereafter, the blow mold in the opened state is lowered to form a state where each preform 2 is positioned between the cavities of the open / close dies 41a and 41b opened to the left and right (step ST33).

  Next, the blow mold 41 </ b> A is closed, the compressed air blowing port 56 is raised from the lower side to form a state communicating with the central through hole 10 a of the mandrel 10, and compressed air is blown into the preform 2. At the same time, the stretching rod 57 is raised to start stretching the preform 2. Thus, biaxial stretching blow of the preform 2 is performed, and a molded product 3A having a shape close to the final product is formed (step ST34).

  Thereafter, after the compressed air is discharged, the stretching rod 57 is lowered, and then the blow mold 41A is pulled up in the clamped state. As a result, the molded product 3A is pulled up together with the preform fixing mandrel 10 while being attached to the blow mold 41A (step ST35).

  Thereafter, the turntable 46 is rotated by 180 degrees, and the blow mold located immediately above the blow molding position 14 is moved to the work position 61 on the opposite side and positioned immediately above.

  Then, the blow mold is lowered, and compressed air is blown into the molded product 3 </ b> A held therein to mold the container 3 as the final molded product, and at the same time, the container 3 is cooled. Thereafter, the compressed air is discharged (step ST36).

  Thereafter, after opening the blow mold, the container 3 is released by being raised (step ST37). The container 3 molded in this way is discharged from the work position 61 (step ST38).

  Thereafter, the turntable 46 is rotated to move the blow mold toward the blow molding position 14. The other blow mold moves toward the working position 61 while holding the molded product 3A. As described above, biaxial stretch blow molding is performed on a pair of blow molds while alternately repeating the blow molding process and the final molding / cooling operation process, and six containers 3 are manufactured. .

  In this example, a pair of blow molds are arranged at an angular interval of 180 degrees. Instead, four sets of blow molds may be arranged on the turntable 46 at intervals of 90 degrees. In this case, for example, blow molding is performed at the blow molding position 14, and the molded product is cooled by blowing compressed air at each position rotated 90 degrees and 180 degrees rotated from this position, and rotated 270 degrees. In position, the container may be removed from the blow mold.

(Other embodiments)
Each of the above examples is an example of a biaxial stretch blow molding apparatus provided with work stations 7, 7A, 7B for performing operations such as label mounting, handle mounting, and final molding / cooling. The present invention is also applicable to a biaxial stretch blow molding apparatus that is not equipped with a work station. In this case, the work station is simply omitted.

  Next, in each of the above examples, the preform 2 is conveyed in an inverted posture to perform blow molding. Instead of this, the preform 2 can be conveyed in an upright posture to perform blow molding.

  In this case, for example, a blow molding station 8C having the configuration shown in FIG. 12 can be used. In the blow molding station 8C, a horizontal substrate 43 attached to the apparatus mount 1a is disposed on the upper side, and a turntable 46 that is rotatably supported by the horizontal frame 45 is disposed on the lower side. At the blow molding position 14 on the upper horizontal substrate 43, six sets of compressed air blowing ports 56, stretching rods 57 and their lifting cylinders 58 are attached.

  A pair of blow mold assemblies 51 </ b> B are mounted on the lower rotating plate 46 at both ends in the diameter direction. Each blow mold assembly 51B includes a blow mold lifting cylinder 52 mounted on the turntable 46, a lifting plate 54 attached to the tip of the lifting rod 53, and a blow mold 41A mounted on the lifting plate 54. It has.

  The overall configuration of the biaxial stretch blow molding apparatus provided with the blow molding station 8C having this configuration is basically the same as the configuration shown in FIG. A different point is that the preform 2 is conveyed in a state where it is suspended from the preform fixing mandrel 10A in an upright state.

  FIG. 13 is an explanatory view of the operation in the blow molding station 8C. First, the six preform fixing mandrels 10 carrying the preform 2 in a temperature suitable for blow molding are fed along the transport path 15 to the blow molding station 8C and positioned at the blow molding position 14. Then, it is made to wait there (step ST41).

  In parallel with the preform conveying operation, movement for positioning the blow mold 41A immediately below the blow molding position 14 is also performed. When the turntable 46 is rotated to the rotational position shown in FIG. 12 and stopped, the blow mold 41A of one blow mold assembly 51B is positioned directly below the blow molding position 14, and then the mold opening is performed (step ST42). ).

  Thereafter, the blow mold 41A is raised and each preform 2 is positioned between the cavities of the open / close molds 41a and 41b (step ST43).

  Next, the compressed air outlet 56 is lowered from the lower side to communicate with the central through hole 10a of the mandrel 10A, and compressed air is blown into the preform 2, and at the same time, the stretching rod 57 is lowered to stretch the preform 2. Start. In this way, biaxial stretching blow of the preform 2 is performed, and the container 3 is formed (step ST44).

  Thereafter, the stretching rod 57 is raised, the blow mold 41A is opened, the blow mold 41 is lowered, and the container 3 is released (step ST45). Thereafter, the container 3 is discharged toward the collection station 9 (step ST46). Such biaxial stretch blow molding operation is performed alternately using a pair of blow molds 41A.

  In this example, a pair of blow molds 41 is mounted. For example, as shown in FIG. 14, four sets of blow molds 41A are mounted on the turntable 46 at intervals of 90 degrees. Alternatively, the blow molding may be performed by sequentially using the respective blow molds 41 </ b> A while rotating them intermittently.

It is a plane lineblock diagram of the biaxial stretch blow molding device to which the present invention is applied. It is a side view of the biaxial stretch blow molding apparatus of FIG. It is a fragmentary top view which shows the label mounting and blow molding station of the biaxial stretch blow molding apparatus of FIG. It is a fragmentary sectional view which shows the label mounting and blow molding station of FIG. It is operation | movement explanatory drawing which shows the operation | movement in the station shown to FIG. It is the fragmentary top view and fragmentary sectional view which show another Example of the station shown to FIG. It is the fragmentary top view and fragmentary sectional view which show another Example of the station shown to FIG. It is operation | movement explanatory drawing which shows the operation | movement in the station of FIG. It is the fragmentary top view and fragmentary sectional view which show the modification of the station of FIG. It is the fragmentary top view and fragmentary sectional view which show another Example of the station shown to FIG. It is operation | movement explanatory drawing which shows the operation | movement in the station of FIG. It is the fragmentary top view and fragmentary sectional view which show an example of the blow molding station by this invention. FIG. 13 is an operation explanatory diagram showing an operation at the station of FIG. 12. It is the fragmentary top view and fragmentary sectional view which show the modification of the station of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Biaxial stretch blow molding apparatus 2 Preform 3 Container 4 Label 4A Handle 5 Preform supply station 6 Preform heating station 7, 7A, 7B Work station 8, 8A, 8B Blow molding station 9 Collection station 11 Preform supply position 14 Blow molding position 41, 41A Blow mold 41a, 41b Open / close mold 46 Turntable 51, 51A Blow mold assembly 56 Compressed air outlet 57 Stretch rod 61 Working position 63 Retraction position 64 Mounting tool

Claims (12)

A preform conveying step for conveying a preform heated to a temperature suitable for blow molding to a blow molding position;
A preform standby step of waiting at the blow molding position the preform that has reached the blow molding position;
A blow mold moving step for moving the blow mold to the blow molding position and forming a state where the standby preform is mounted on the blow mold;
A blow molding step of blow molding the preform in the blow mold to form a blow molded container;
A blow molding die returning step of returning the blow molding die from the blow molding position to a standby position. In claim 1,
A blow molding method comprising a work step of performing a predetermined work on the blow molding die returned to the standby position. In claim 2,
A plurality of blow molds are prepared as the blow mold,
In the form in which the blow molding step for one blow molding die and the work step for another blow molding die are performed in parallel, the blow mold moving step, the blow molding are performed for each blow molding die. A blow molding method comprising repeatedly performing a process, the blow molding die returning process, and the work process. In claim 2,
As the blow mold, a plurality of sets of blow mold groups composed of a plurality of blow molds are prepared,
In the form in which the blow molding step for one blow molding die group and the work step for another blow molding die group are performed in parallel, the blow molding step and the blow molding step and A blow molding method characterized by repeatedly performing a work process. In claim 2,
In the work process, in-mold parts are mounted on the blow mold,
In the blow molding step, the blow molding container in which the parts are in-molded is obtained. In claim 5,
The blow molding method, wherein the in-mold component is a label that is in-molded on an outer peripheral surface of the blow molding container. In claim 5,
The blow molding method, wherein the in-mold component is a handle in-molded in the blow molding container. In claim 2,
Prior to the blow molding step, including a heating step of heating the blow mold to a predetermined temperature,
In the blow molding die return step, the molded blow molding container is returned to the standby position while being held in the blow molding die,
In the operation step, the blow molding container is cooled by blowing compressed air into the blow molding container, and then the blow molding container is taken out from the blow molding die. In claim 2,
The preform is a bottomed cylinder with one end opening as a mouth,
In the preform conveying step, the preform standby step, and the blow molding step, the preform is held in an inverted posture in which the mouth portion is downward or in an upright posture in which the mouth portion is upward. Blow molding method. In claim 9,
A blow molding method using a preform fixing mandrel having an insertion core that can be inserted into a mouth portion of the preform to transport the preform. In claim 10,
The blow mold is a cylindrical mold having one end open;
In the blow mold moving step, the cylindrical mold is raised or lowered, the preform is positioned therein, and the end surface of the cylindrical mold is brought into contact with the preform fixing mandrel to clamp the mold. A blow molding method characterized by forming a state. In claim 10,
The blow molding die is a pair of opening and closing molds that can be opened and closed to the left and right,
In the blow molding mold moving step, the open / close mold in the open state is raised or lowered, the preform is positioned between them, and then the open / close mold is closed to form a clamped state. Blow molding method characterized.

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