JP5284751B2 - Blow molding preform carrier and blow mold - Google Patents

Description

  The present invention relates to a blow-molding preform carrier and a blow-molding die used for transporting a bottomed cylindrical preform made of a thermoplastic resin such as PET via a blow-molding position by a blow-molding die. . More specifically, a preform carrier for blow molding that is suitable for use in blow molding of a blow molded product called a wide-mouth bottle or a wide-mouth container having a large-diameter mouth compared to a general beverage bottle, and the like The present invention relates to a blow mold.

  Wide-bottle bottles and wide-mouth containers are generally produced by producing a bottomed cylindrical preform by injection molding and biaxially stretching and blowing a portion other than the mouth of the preform. Patent Document 1 discloses a stretch blow molding method in which a preform after injection molding is transferred to a blow mold as it is with a mouth held by a lip mold (preform carrier) to produce a wide-mouth container. Yes.

Patent Document 2 discloses a method for producing a bottle having a small diameter with a general mouth by biaxial stretch blow molding. In the method disclosed herein, a preform is supported on a preform carrier, and in this state, the preform is heated to a temperature suitable for biaxial stretching blow by conveying the preform carrier via a heating station. Thereafter, the preform carrier carrying the heated preform is sent to the molding position of the blow mold, the blow mold is closed, and the preform is subjected to biaxial stretching blow.
JP 2001-121598 A JP 2007-276327 A

  Here, at the time of biaxial stretching blow molding of the preform in the blow molding die, the preform is stretched by the stretching rod and high pressure blow air is supplied into the preform to blow the preform. Therefore, pressure by blow air acts on the preform carrier that supports the mouth portion of the preform during molding.

  When blow molding a container having a small diameter opening, the preform carrier may be of a small diameter and the pressure receiving area of the blow air is narrow, so that a large force is not applied by the blow air during blow molding. However, when blow-molding a wide-mouth container having a large diameter mouth, a preform carrier having a large diameter is used to support the large-diameter mouth, and the pressure receiving area of the blow air is widened. A large force is applied by blow air during blow molding.

  If a large force is temporarily applied to the preform carrier during the introduction of blow air during blow molding, the preform carrier may be pushed down in the axial direction of the blow molding die, which may cause displacement in the axial direction. . For this reason, it is necessary to support the preform carrier from the opposite side with a large force that can oppose the force applied to the preform carrier. In this way, the direction of the force acting on the preform carrier is reversed before and after the supply of blow air, for example, the open / close mold that opens and closes left and right is pushed up, and the bottom mold side part opens left and right Therefore, there is a possibility that a large parting line may be formed in the blow molded product. Furthermore, there is a possibility that the mouth dimensions are deformed.

  In view of these points, an object of the present invention is to propose a preform carrier for blow molding that does not cause adverse effects such as displacement even when a large force is applied by blow air during blow molding.

  Another object of the present invention is to propose a blow molding die suitable for blow molding using such a new blow molding preform carrier.

In order to solve the above problems, the present invention is a preform carrier for blow molding used for conveying a bottomed cylindrical preform made of a thermoplastic resin via a blow molding position by a blow molding die. And
An outer cylinder,
An inner cylinder mounted coaxially inside the outer cylinder;
An insertion coring attached coaxially to one end in the central axial direction of the inner cylinder,
Between a first pressure receiving surface formed on a part of the inner peripheral surface of the outer cylinder and a second pressure receiving surface formed on a part of the outer peripheral surface of the inner cylinder facing the first pressure receiving surface. A pressure chamber formed in
A blow air introduction path having one end opened to the inner peripheral surface of the inner cylinder and the other end communicating with the pressure chamber;
By inserting the insertion coring into the mouth of the preform to be transported, a state of carrying the preform is formed,
When blow air is introduced into the pressure chamber, the inner cylinder is biased toward the insertion core ring and the outer cylinder is biased to the opposite side along the central axis direction. It is a feature.

  The preform carrier for blow molding of the present invention includes a pressure chamber into which blow air is introduced, and blow air is introduced into the pressure chamber at the time of blow molding. When blow air is introduced into the pressure chamber, a reverse force is applied to the outer cylinder and the inner cylinder of the blow molding preform carrier along their axial directions. Therefore, it can be prevented that a large force acts in one direction on the preform carrier due to the blow air, and adverse effects such as misalignment occur on the preform carrier. Further, since the support strength of the support mechanism for supporting the preform carrier so as not to move by blow air may be small, the support mechanism can be made small and simple.

  Here, a pressure chamber can be formed by the outer cylinder and the inner cylinder configured as follows. That is, the inner cylindrical body is provided with a radially outward flange at the end on the side of the insertion core ring, and the insertion core ring is fixed to one end face of the flange, The second pressure receiving surface is formed on the other end surface. The outer cylindrical body has a flange portion extending radially outward at an end portion on the insertion core ring side, and a ring extending from the outer peripheral edge of the flange portion to the insertion core ring side. The first pressure receiving surface facing the second pressure receiving surface at a predetermined interval is formed on one end face of the flange portion. Furthermore, the inner peripheral surface of the ring portion of the outer cylindrical body faces the outer peripheral surface of the flange of the inner cylindrical body, and the space between them is sealed in an airtight state.

  Next, the first supported surface and the second supported surface are provided as follows so that the preform carrier for blow molding of the present invention can be supported from both sides in the central axis direction. It is desirable. That is, the insertion core ring includes a disc-shaped main body portion and a ring-shaped protrusion portion that protrudes coaxially from an end surface of the main body portion opposite to the inner cylindrical body, and the ring on the end surface An annular end surface portion surrounding the protruding portion is a first supported surface used for supporting the blow molding preform carrier from the side opposite to the inner cylindrical body in the central axis direction. The other end face of the flange portion of the outer cylindrical body is a second supported surface used to support the blow molding preform carrier from the opposite side of the insertion core ring in the axial direction. is there.

  In order to heat the preform uniformly by conveying the preform via a heating station in which heaters are arranged on both sides using the preform carrier for blow molding of the present invention, It is desirable to convey while rotating around the central axis. For this purpose, a chain sprocket may be attached to the outer peripheral surface of the outer cylindrical body. If a chain is arranged along the conveyance path that passes through the heating station and the preform carrier is conveyed while being engaged with this chain, the preform carrier is conveyed while rotating around its axis, and is carried on it. Each part of the preform can be heated uniformly.

  Next, the present invention is a blow molding die used for blow molding a preform carried on a blow molding preform carrier having the above-described configuration, and the preform carrier is supported from one side in the axial direction thereof. The carrier support surface is capable of supporting the second supported surface of the blow molding preform carrier in a clamped state.

  Here, a carrier auxiliary support surface for supporting the preform carrier from one side in the axial direction thereof and a carrier support surface for supporting from the other side are disposed, and the carrier auxiliary surface in the mold clamping state is arranged. A support surface can support the first supported surface of the blow molding preform carrier, and the carrier support surface supports the second supported surface of the blow molding preform carrier. Also good.

  Embodiments of a blow molding preform carrier and blow molding die to which the present invention is applied will be described below with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing a preform carrier for blow molding, a preform and a wide-mouth container according to the present embodiment, and FIG. 2 is an enlarged longitudinal sectional view of the preform carrier for blow molding. The preform 1 is an injection-molded product of a thermoplastic resin such as PET, a mouth 2 having a constant diameter in which a male screw is formed, and a shoulder portion 3 having the same diameter continuous to the mouth 2. A substantially hemispherical bottom portion 4 that is continuous to the shoulder forming portion 3 is provided. A wide-mouthed container 5 manufactured by biaxially stretching blow-molding the preform 1 has a mouth 6 in which the mouth 2 remains as it is and a shoulder formed by biaxially stretching and blowing the shoulder portion forming portion 3. 7, and a cylindrical body 8 and a circular bottom 9 formed by biaxially stretching and blowing the bottom 4.

  The preform carrier 10 for blow molding includes an outer cylinder 11, an inner cylinder 12 mounted coaxially inside the outer cylinder 11, and one end of the inner cylinder 12 in the direction of the central axis 10a (in the drawing, Has an insertion core ring 13 attached coaxially to the upper end of the inner cylinder 12. An annular first pressure receiving surface 14 is formed on a part of the inner peripheral surface of the outer cylinder 11, and a circle facing the first pressure receiving surface with a certain gap is formed on the outer peripheral surface of the inner cylinder 12. An annular second pressure receiving surface 15 is formed, and an annular pressure chamber 16 is formed therebetween. The pressure chamber 16 communicates with the outer end of the blow air introduction hole 17, and the inner end of the blow air introduction hole 17 opens on the inner peripheral surface of the inner cylinder 12.

  The structure of each part will be described mainly with reference to FIG. First, the outer cylinder 11 includes a cylindrical main body portion 21, a disc-shaped flange portion 22 having a constant thickness extending outward from the upper end portion of the cylindrical main body portion 21, and an outer peripheral end of the disc-shaped flange portion 22. And a ring portion 23 that is bent upward and extends at a right angle. An annular upper end surface 22 a of the disc-shaped flange portion 22 is the first pressure receiving surface 14. In addition, a disk-shaped lower flange portion 24 that extends outward at a right angle is formed coaxially on the outer peripheral surface of the cylindrical main body portion 21, and at a certain interval on the upper side, A chain sprocket 25 is formed coaxially. A flange may be formed instead of the chain sprocket 25.

  The inner cylinder 12 includes a cylindrical body portion 31 inserted inside the cylindrical body portion 21 of the outer cylinder 11, and a disk-like flange 32 extending outward from the upper end portion of the cylindrical body portion 31 at a right angle. ing. The lower end portion of the cylindrical main body portion 31 protrudes downward from the lower end of the cylindrical main body portion 21 of the outer cylinder 11, and a retaining ring 33 is fixed to the outer peripheral surface of this protruding portion. The retaining ring 33 is engaged with the lower end surface 21a of the cylindrical body portion 21 of the outer cylinder 11 via an annular rubber bush 34, so that the inner cylinder 12 does not come off the outer cylinder 11 upward. Yes. A cylindrical bearing 26 whose lower end is in contact with the rubber bush 34 is mounted on the inner peripheral surface of the cylindrical main body portion 21 of the outer cylinder 11.

  An annular end surface 36 on the lower side of the disc-shaped flange 32 in the inner cylinder 12 has an end surface portion on the inner peripheral edge side slightly protruding downward, and an outer end surface portion thereof is the first pressure receiving surface 14 of the outer cylinder 11. The second pressure-receiving surface 15 is opposed to each other at a constant interval. A large number of blow air introduction holes 17 are formed radially at the boundary portion between the cylindrical main body portion 31 of the inner cylinder 12 and the disk-shaped flange 32.

  A seal ring 27 attached to an annular groove formed on the inner peripheral surface of the cylindrical body portion 21 of the outer cylinder 11 is disposed below the blow air introduction hole 17. The space between the outer peripheral surface of the cylindrical body portion 31 of the cylinder 12 and the inner peripheral surface of the cylindrical body portion 21 of the outer cylinder 11 is hermetically sealed. Similarly, the circular outer peripheral surface of the disk-shaped flange 32 of the inner cylinder 12 and the ring portion of the outer cylinder 11 are sealed by a seal ring 37 attached to an annular groove formed on the circular outer peripheral surface of the disk-shaped flange 32 of the inner cylinder 12. 23 is hermetically sealed with the circular inner peripheral surface. Therefore, the pressure chamber 16 is kept airtight except that it communicates with the blow air introduction hole 17.

  Next, the annular upper end surface 38 of the disk-shaped flange 32 of the inner cylinder 12 is a stepped end surface in which the inner peripheral edge portion slightly protrudes upward. On the upper end surface 38, the insertion core ring 13 having a complementary lower end surface 41 is fixed in a coaxial state by a fastening bolt 42. The insertion core ring 13 includes a disk-shaped main body portion 43 and a ring-shaped protrusion portion 44 that protrudes upward from the upper end surface of the main body portion 43. The ring-shaped protruding portion 44 is set to a size that can be fitted into the mouth portion 2 of the preform 1. The annular upper end surface 13a surrounded by the ring-shaped protruding portion 44 receives blow air pressure during blow molding.

  Here, an annular end surface portion 45 on the outer peripheral edge side of the disc-shaped main body portion 43 surrounding the ring-shaped protrusion portion 44 is a support surface of the end surface of the mouth portion 2 of the preform 1. Further, as will be described later, the annular end surface portion 45 functions as a first supported surface that can be supported from above by a blow mold. Moreover, the lower annular end surface 28 in the annular flange portion 22 of the outer cylinder 11 functions as a second supported surface supported from below by the blow molding die, as will be described later.

  The blow molding preform carrier 10 configured as described above is transported along a transport path via a heating station (not shown) in a state where the preform 1 is supported in an inverted state as shown in FIG. . The conveyance path is defined by, for example, a pair of left and right rails 51 and 52 as indicated by an imaginary line in FIG. 1, and the chain sprocket 25 of the outer cylinder 11 of the preform carrier 10 for blow molding, or Instead of this, a flange provided is supported in a riding state. In this state, the blow molding preform carrier 10 is conveyed along the rails 51 and 52.

  For example, a chain 53 is bridged along the rails 51 and 52 on the conveyance path passing through the heating station. In this case, the blow molding preform carrier 10 is conveyed in a state where the chain sprocket 25 is engaged with the chain. In the case where a flange is formed instead of the chain sprocket 25, the blow molding preform carrier 10 is mounted on each of the plurality of rotary tables provided with the sprocket, and the sprocket of the rotary table is engaged with the chain. Be transported. As a result, the preform carrier 10 for blow molding is conveyed while rotating around its central axis, so the preform 1 carried thereon is heated while rotating around its central axis, and the entire blow carrier is blown uniformly. Heated to a temperature suitable for molding. The blow molding preform carrier 10 carrying the preform 1 heated to a temperature suitable for blow molding is then fed into the molding position of the blow mold. Thereafter, the blow mold is clamped, and the preform 1 is biaxially stretched.

  FIG. 3 is a schematic longitudinal sectional view showing a state before biaxial stretching blow is performed in the blow mold, and FIG. 4 is a partially enlarged sectional view thereof. The blow molding die 60 includes, for example, opening and closing dies 61 and 62 that open and close to the left and right, and a bottom die 63 that moves in the vertical direction. Cavities having the shoulder 7 of the wide-mouthed container 5, the cylindrical body 8 and the molding surfaces 64 and 65 of the outer peripheral portion of the bottom 9 are formed on the opposing surfaces of the left and right open / close dies 61 and 62. A molding surface 66 for molding the central side portion of the bottom portion 9 of the wide-mouthed container 5 is formed on the tip surface of 63. A blow air nozzle 67 is vertically arranged below the center of the blow mold 60. An extending rod 68 is vertically disposed so as to pass through the nozzle 67 coaxially. The nozzle 67 and the extending rod 68 are moved up and down by a lifting mechanism (not shown).

  Here, semicircular inner peripheral surface portions 71 and 72 having an inner diameter slightly larger than the outer diameter of the mouth portion 2 of the preform 1 are formed at the lower ends of the left and right opening and closing molds 61 and 62. Semicircular arc-shaped protrusions 73 and 74 projecting inward are formed at the lower end portions of the semicircular inner peripheral surface portions 71 and 72. The lower surfaces of these arc-shaped protrusions 73 and 74 can be brought into contact with the lower end surface 2a of the mouth portion 2 of the preform 1 in the mold clamping state.

  Below these arc-shaped protrusions 73 and 74, semicircular arc members 75 and 76 having a rectangular cross section having an inner peripheral surface having an inner diameter smaller than the inner peripheral surface portions 71 and 72 are attached. The inner peripheral surfaces of the arc members 75 and 76 are in contact with the outer peripheral surface of the mouth portion 2 of the preform 1 in the mold clamping state. Further, the lower end surfaces 75a and 76a of the arc members 75 and 76 are formed on the annular end surface portion 45 (first supported surface) of the insertion core ring 13 of the blow molding preform carrier 10 in the mold clamping state. It is a carrier auxiliary support surface that can be contacted from above.

  On the other hand, semicircular arcuate support members 81 and 82 are fixed to the lower end surfaces of the left and right open / close dies 61 and 62. The inner peripheral surfaces of these arcuate support members 81 and 82 are formed from the upper side by large-diameter inner peripheral surface portions 81a and 82a, medium-diameter inner peripheral surface portions 81b and 82b, and small-diameter inner peripheral surface portions 81c and 82c. It has a stepped surface. In the clamped state, the large-diameter inner peripheral surface portions 81 a and 82 a face the outer peripheral surface of the insertion core ring 13 of the blow molding preform carrier 10. Further, the inner diameter inner peripheral surface portions 81 b and 82 b come into contact with the outer peripheral surface of the ring portion 23 of the outer cylinder 11 of the blow molding preform carrier 10. Further, the upward annular stepped surface portions 81d and 82d between the medium diameter inner peripheral surface portions 81b and 82b and the small diameter inner peripheral surface portions 81c and 82c are formed on the ring portion 23 of the outer cylinder 11 of the preform carrier 10 for blow molding. To the annular end surface 28 (second supported surface) from below. These annular step surface portions 81d and 82d function as carrier support surfaces that support the blow molding preform carrier 10 from below.

  When the blow molding preform carrier 10 carrying the preform 1 is loaded and positioned at the center (molding position) of the blow molding die 60 having this configuration, a mold clamping operation is performed. After the mold clamping, as shown in FIGS. 3 and 4, the mouth portion 2 of the preform 1 is sandwiched between the lower portions of the left and right open / close dies 61 and 62 and the insertion core ring 13, so that the blow molding The reform carrier 10 is gripped from the left and right by the left and right arcuate support members 81 and 82 and is supported from below.

  Thereafter, the blow air nozzle 67 rises from below and is pressed coaxially against the lower end of the blow molding preform carrier 10 (lower end of the inner cylinder 12), and the space between them is sealed in an airtight state. Stopped. That is, a ring-shaped rubber bush 67a is attached to the upper end surface of the nozzle 67, which is elastically deformed to form an airtight state. After this state is formed, blow air is supplied to the inside of the preform 1 in the molding die through the hollow portion of the blow molding preform carrier 10. Further, at a predetermined timing, the stretching rod 68 also rises through the hollow portion 10b of the blow molding preform carrier 10 to stretch the preform 1 in the molding die upward. The preform 1 is biaxially stretched in the mold by these blow air and the stretching rod.

  Here, when blow air is introduced, a large downward force acts on the upper end surface 13a of the insertion core ring 13 inserted into the mouth portion 2 of the preform 1, and the blow molding preform carrier 10 is moved downward. Is pushed into. However, a part of the blow air is supplied into the pressure chamber 16 from the blow air introduction hole 17 communicating with the inner peripheral surface of the blow molding preform carrier 10, and the blow molding preform carrier 10 is blown by the blow air. A downward force acts on the outer cylinder 11, and an upward force acts on the inner cylinder 12. The upward force generated in this way cancels or reduces the force that pushes the blow molding preform carrier 10 downward.

  The downward force acting on the blow molding preform carrier 10 is supported by arcuate support members 81 and 82 attached to the lower ends of the left and right opening and closing dies 61 and 62, and the upward force is applied to the left and right opening and closing dies 61. , 62 are supported by lower end surfaces 75a, 76a of the arc members 75, 76.

  Therefore, since the force acting on the blow molding preform carrier 10 by blow air can be reduced, the blow molding preform carrier 10 can be prevented from moving up and down by blow air. In addition, since the blow molding preform carrier 10 is supported by the molding die so as not to move in the vertical direction, a large force does not act on the nozzle 67. Therefore, the pushing force of the nozzle 67 can be reduced.

It is a longitudinal cross-sectional view which shows the preform carrier for blow molding to which this invention is applied, preform, and a wide mouth container. FIG. 2 is an enlarged longitudinal sectional view of the blow molding preform carrier of FIG. 1. It is a schematic longitudinal cross-sectional view which shows the state before biaxial stretching blow is performed in a blow molding die. It is a partial expanded sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Preform 2 Mouth part 2a Lower end surface 3 Shoulder part formation part 4 Bottom part 5 Wide-mouthed container 6 Mouth part 7 Shoulder part 8 Cylindrical trunk part 9 Bottom part 10 Preform carrier 10a for blow molding Center axis 10b Hollow part 11 Outer cylinder 12 Inner cylinder 13 Insertion core ring 13a Upper end surface 14 First pressure receiving surface 15 Second pressure receiving surface 16 Pressure chamber 17 Blow air introduction hole 21 Cylindrical body portion 21a Lower end surface 22 Disc-shaped flange portion 22a Upper end surface 23 Ring portion 24 Lower flange portion 25 Chain sprocket 26 Bearing 27 Seal ring 28 Annular end surface 31 Cylindrical body portion 32 Disc-shaped flange 33 Retaining ring 34 Rubber bush 36 Annular end surface 37 Seal ring 38 Upper end surface 41 Lower end surface 42 Fastening bolt 43 Main body portion 44 Ring-shaped projection Part 45 Annular end face part 51, 52 Rail 53 Chain 60 Blow Molding die 61, 62 Opening / closing die 63 Bottom die 64, 65, 66 Molding surface 67 Nozzle 67a Rubber bushing 68 Stretching rod 71, 72 Inner peripheral surface portion 73, 74 Arc-shaped protrusions 75, 76 Arc members 75a, 76a Lower end surface 81, 82 Arc-shaped support members 81a, 82a Large-diameter inner peripheral surface portions 81b, 82b Medium-diameter inner peripheral surface portions 81c, 82c Small-diameter inner peripheral surface portions 81d, 82d Annular step surface portions

Claims (6)

A preform carrier (10) for blow molding used for transporting a bottomed cylindrical preform (1) made of a thermoplastic resin via a blow molding position by a blow mold (60),
An outer cylinder (11);
An inner cylinder (12) mounted coaxially inside the outer cylinder (11);
An insertion core ring (13) attached coaxially to one end of the inner cylinder (12) in the direction of the central axis (10a);
A first pressure receiving surface (14) formed on a part of the inner peripheral surface of the outer cylinder (11), and an outer peripheral surface of the inner cylinder (12) facing the first pressure receiving surface (14). A pressure chamber (16) formed between the second pressure receiving surfaces (15) formed in a part of
A blow air introduction path (17) having one end opened in the inner peripheral surface of the inner cylinder (12) and the other end communicating with the pressure chamber (16);
By inserting the insertion core ring (13) into the mouth (2) of the preform (1) to be transported, a state of carrying the preform (1) is formed,
When blow air is introduced into the pressure chamber (16), the inner cylinder (12) is urged toward the plug-in core ring (13) along the direction of the central axis (10a), The preform carrier (10) for blow molding, wherein the outer cylinder (11) is biased to the opposite side. In the preform carrier (10) for blow molding according to claim 1,
The inner cylindrical body (12) includes a flange (32) that spreads outward in the radial direction at an end of the insertion core ring (13), and one end face of the flange (32). The insertion core ring (13) is fixed to the other end surface (36), and the second pressure receiving surface (15) is formed,
The outer cylindrical body (11) has a flange portion (22) spreading outward in the radial direction at an end portion on the insertion core ring (13) side, and the difference from the outer peripheral edge of the flange portion (22). And a ring portion (23) extending toward the embedded core ring (13), and one end surface (22a) of the flange portion (22) is predetermined with respect to the second pressure receiving surface (15). The first pressure-receiving surface (14) facing each other is formed,
The inner peripheral surface of the ring portion (23) of the outer cylindrical body (11) faces the outer peripheral surface of the flange (32) of the inner cylindrical body (12), and the space between them is sealed in an airtight state. A preform carrier (10) for blow molding characterized by being made. In the preform carrier (10) for blow molding according to claim 2,
The insertion core ring (13) includes an annular main body portion (43) and a ring-shaped protrusion projecting coaxially from an end surface of the main body portion (43) opposite to the inner cylindrical body (12). And an annular end surface portion (45) surrounding the ring-shaped projection portion (44) at the end surface is opposite to the inner cylindrical body (12) in the direction of the central axis (10a). From the first supported surface used to support the blow molding preform carrier (10),
The other end face (28) of the flange portion (22) of the outer cylinder (11) is connected to the blow molding plug from the opposite side of the insertion core ring (13) in the direction of the central axis (10a). A preform carrier (10) for blow molding, which is a second supported surface used for supporting the reform carrier (10). In the preform carrier (10) for blow molding according to claim 3,
The outer cylindrical body (11) is provided with a chain sprocket (25) on its outer peripheral surface, and a blow molding preform carrier (10). A blow mold (60) used for blow molding a preform (1) carried on a blow molding preform carrier (10) according to claim 3 or 4,
A carrier support surface (81d, 82d) for supporting the preform carrier (10) from one side in the direction of its central axis (10a);
In the mold clamping state, the carrier supporting surfaces (81d, 82d) are in a state of supporting the second supported surface (28) of the blow molding preform carrier (10). (60). A blow mold (60) used for blow molding a preform (1) carried on a blow molding preform carrier (10) according to claim 3 or 4,
Carrier auxiliary support surfaces (75a, 76a) capable of supporting the preform carrier (10) from one side in the direction of its central axis (10a);
A carrier support surface (81d, 82d) for supporting the preform carrier (10) from the other side in the direction of its central axis (10a);
In the mold-clamping state, the carrier auxiliary support surfaces (75a, 76a) can support the first supported surface (45) of the blow molding preform carrier (10), and the carrier support surface (81d). , 82d) is in a state of supporting the second supported surface (28) of the preform carrier (10) for blow molding (60).

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