JP6502681B2 - Blow molding equipment - Google Patents

Description

  The present invention relates to a blow molding apparatus which heats a preform to a temperature suitable for molding and then stretch blow molding.

Conventionally, when blow molding a PET (polyethylene terephthalate) bottle, sterilization is performed at the stage of preform before blow molding. With regard to this sterilization, there is known an apparatus for supplying a sterilizing agent mainly composed of hydrogen peroxide and peracetic acid to the mouth of a preform before molding (for example, Patent Document 1).
In addition, a sterilizer that irradiates sterilizing light, typically ultraviolet light, to the mouth of a PET bottle is also known (for example, Patent Document 2).

Japanese Patent Application Publication No. 2011-527246 (FIG. 1) Unexamined-Japanese-Patent No. 2003-252312 (FIG. 1)

Patent Document 1 presupposes that the sterilizing agent is supplied to the mouth of each preform, and specifically, the sterilizing agent is supplied to the mouth of the preform held by the compressed air actuator. . Therefore, in patent document 1, the efficiency at the time of sterilizing many preforms is inferior.
Moreover, since the light source of the ultraviolet-ray is provided above the PET bottle which stands up in patent document 2, the screw for sealing is cut in the opening and sterilization of the outer peripheral surface which makes a complicated shape is not completed. It may be enough.

  Therefore, an object of the present invention is to provide a blow molding device capable of efficiently sterilizing a large number of preforms and sufficiently sterilizing the entire preform including the outer peripheral surface of the mouth.

The blow molding apparatus according to the present invention is a blow molding apparatus for obtaining a container by stretch blow molding a heated preform, wherein the conveyance path for conveying the preform from the upstream side to the downstream side, and the conveyance path Heating unit that heats the preform that is transported from the side, and a sterilizing unit that includes a sterilizing light source that sterilizes the preform that is transported along the transportation path from the side by sterilizing light; a forming section for stretch blow molding a preform which has been sterilized by being heated and sterilized unit by part, Ru comprising a.
The preform has a mouth and a body, but in the blow molding apparatus of the present invention, the body corresponds to the heating area by the heating part, and the mouth corresponds to the irradiation area of the sterilizing light by the sterilizing part. In addition, in the blow molding device of the present invention, the heating unit and the sterilizing unit are provided adjacent to mutually different positions in the vertical direction with respect to the preform to be heated and sterilized.

In the blow molding apparatus of the present invention, it is preferable that the preform held in a state in which the outer peripheral surface is open is sterilized .

In the blow molding device of the present invention, the sterilizing unit may include a sterilizing gas supply unit for supplying sterilizing gas to a sterilizing area to which sterilizing light from the sterilizing light source is irradiated.
When the sterilizing gas supplier is provided, the sterilizing light source and the sterilizing gas supplier can be provided adjacent to each other.
In addition, it is preferable that the sterilizing gas supply unit supply a sterilizing gas derived from a sterilizing agent that generates active oxygen or hydroxyl radical. In addition, the sterilizing gas in the present invention is the meaning widely including what vaporized a sterilizing agent, and has a concept including mist.

In the blow molding device of the present invention, it is preferable that the transport path transports one or both of the heating unit and the sterilization unit while rotating the preform around its axis.
In the blow molding device according to the present invention, it is preferable that the transport path partially includes an outward path and a return path, and one or both of the heating unit and the sterilizing portion be provided in the outward path and the return path.

According to the blow molding apparatus of the present invention, the heating unit heats the preform conveyed along the conveyance path, and the sterilizing unit irradiates sterilizing light to sterilize, so heating and sterilization of the preform are performed. It can be done continuously. Although heating of the preform is performed for stretch blow molding in the molding section, this heating also contributes to sterilization of the preform. Therefore, according to the present invention, a large number of preforms can be efficiently sterilized.
Further, according to the present invention, the heating unit heats the preform from the side, and the sterilizing unit irradiates the preform with the sterilizing light from the side, so the entire preform including the outer peripheral surface of the mouth is Can sterilize well.

It is the top view which showed typically the blow molding apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of the sterilization heating part of the blow molding apparatus of FIG. It is a figure which shows the several structural example of a heat sterilization part. It is the top view which showed typically the blow molding apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the heating part of the blow molding apparatus of FIG. It is sectional drawing which shows the structure of the sterilization part of the blow molding apparatus of FIG. It is a figure which shows the example of arrangement | positioning of a sterilization part.

First Embodiment
A first embodiment of the present invention will be described based on FIG. 1 and FIG.
In FIGS. 1 and 2, the blow molding apparatus 1 according to the first embodiment sterilizes the mouth portion Pm while heating the body portion Pb of the test tube preform P conveyed continuously from the upstream side, The bottle B is formed by stretch blow molding. In FIG. 1, solid arrows indicate the direction in which the preform P is transported. Further, in the present embodiment, the upstream and the downstream are defined based on the direction in which the preform P or the bottle B is transported.
As shown in FIG. 1, the blow molding apparatus 1 is a heat sterilization unit 10 for sterilizing the mouth Pm while heating the body Pb of the preform P, and a heating and sterilization treatment performed by the heat sterilization unit 10. And a rotary forming unit 20 for stretch blow molding the reform P. The heat sterilization unit 10 and the forming unit 20 are provided inside the clean room 5.

[Forming part 20]
First, the forming unit 20 inserts the preform P, which has been heated to an appropriate temperature necessary for forming by the heat sterilization unit 10, into a forming die that is equally divided in the circumferential direction. A blow molding gas is blown inward to stretch blow mold the bottle B. The present embodiment does not ask about the specific configuration of the molding unit 20, and a conventional rotary stretch blow molding apparatus can be used.

[Transportation unit 30]
The blow molding apparatus 1 includes a transport unit 30 that transports the preform P from upstream to downstream. In addition, as shown below, although the conveyance part 30 consists of several elements, the conveyance path of this invention is comprised from the combination of these elements.
As shown in FIG. 1, the conveyance unit 30 holds the first conveyance unit 31 for introducing the preform P into the inside of the clean room 5 from the outside and the preform P received from the first conveyance unit 31 while heating. And a second transport unit 33 that allows the sterilization unit 10 to pass through.
The preform P transported to the inside of the clean room 5 by the first transport unit 31 is delivered to the container holding means 40 associated with the second transport unit 33 via the wheel 32, and heat sterilization is performed by the second transport unit 33. The unit 10 is transported.
The second conveyance unit 33 is wound around the wheel 34A and the wheel 34B, and conveys the preform P by rotationally driving at least one of the wheels 34A and 34B. The second transport unit 33 penetrates the heating and sterilizing unit 10 in the transport direction, and inside the heating and sterilizing unit 10, a forward path 33A directed from the wheel 34A to the wheel 34B and a return path 33B directed from the wheel 34B to the wheel 34A Prepare. That is, one preform P passes through the heat sterilization section 10 substantially twice. Thereby, the blow molding apparatus 1 realizes heating and sterilization of the preform P while having a narrower installation space.
The transport unit 30 includes a wheel 35 that delivers the preform P that has passed through the heat sterilization unit 10 to the second transport unit 33, and the wheel 35 delivers the received preform P to the forming unit 20.
The transport unit 30 further includes wheels 36 and 37 for transporting the bottle B blow-molded by the molding unit 20 downstream of the blow molding apparatus 1, for example, toward the aseptic filling machine.

[Container holding means 40]
As shown in FIG. 2, the container holding means 40 fixes the holding rod 41, the grip rod 43 engaged with the holding rod 41 and supported, and the grip rod 43 while holding the grip rod 43 to the second transport unit 33. And a gripper 44.
The holding rod 41 includes a lower collar 41B which holds the preform P, and an upper collar 41C which is a portion engaged with the grip rod 43. The lower collar 41B and the upper collar 41C are a rod main body 41A. Are integrally connected.
An O-ring 42 is fitted on the outer peripheral surface of the lower collar 41B, and the lower collar 41B is held inside the mouth portion Pm via the O-ring 42 to hold the preform P.
In the upper collar 41C, an engagement groove 41D into which the engagement rod 43B of the grip rod 43 is inserted is formed.
As shown in FIG. 2, the holding rod 41 is in contact with the fixed guide 45 on one side of the upper collar 41C, and is in contact with the belt 46 moving at the appropriate speed in the same direction as the second conveyance section 33. . Thus, a rotation mechanism is configured in which the holding rod 41 rotates in the direction of the arrow with respect to the grip rod 43.

The grip rod 43 has an engagement rod 43B at its lower end, and the engagement rod 43B is inserted into the engagement groove 41D of the holding rod 41 to hold the holding rod 41 while engaging. In this engagement relationship, the engagement rod 43B can slide in the engagement groove 41D so that the holding rod 41 and the grip rod 43 can be relatively rotated. In addition, the grip rod 43 includes a rod main body 43A connected to the engagement rod 43B, and the rod main body 43A is gripped by the gripper 44.
The grippers 44 are arranged at equal pitches in the longitudinal direction of the second conveyance unit 33, and move following the conveyance motion of the second conveyance unit 33.

[Heating sterilization section 10]
As shown in FIG. 1, the heat sterilization unit 10 is provided along the second conveyance unit 33 on both sides in the width direction W, and mainly the body of the preform P conveyed by the second conveyance unit 33. The Pb is heated to a temperature suitable for shaping. In addition, although the heat sterilization part 10 each provided in the both sides of the 2nd conveyance part 33 has the same structure, when distinguishing both, the side corresponding to the outward route 33A of the 2nd conveyance part 33 is heat-sterilized The side corresponding to the return path 33B of the second conveyance unit 33 is referred to as a heat sterilization unit 10B.
This embodiment shows an example in which both the heating unit and the sterilizing unit are provided in the same area of the transport path.

  The heat sterilization part 10 is provided with the heating part 11 and the disinfection part 15 which mutually adjoin as shown in FIG. 2, The heating part 11 is provided in order to heat the trunk | drum Pb of the preform P, and the sterilization part 15 is provided. Is provided for the purpose of sterilizing the mouth portion Pm of the preform P and the vicinity thereof. In the present embodiment, since the preform P is transported in the erect state, as shown in FIG. 2, the sterilizing unit 15 is disposed on the heating unit 11, but the preform P is inverted and transported. When the heating unit 11 and the sterilizing unit 15 are arranged in the vertical direction, they are reversed. In any case, the heating unit 11 and the sterilization unit 15 are placed on the side of the preform P to be transported.

The heating unit 11 includes, for example, a heating halogen lamp unit, and receives the heating light source 12 for emitting the heating light H1 directed to the body Pb of the preform P, and the heating light H1 emitted from the heating light source 12 to receive the body Pb. And a reflecting plate 13 for reflecting the reflected light H2. The heating light source 12 and the reflection plate 13 cross the conveyance path of the preform P, and the heating light source 12 is outside the conveyance path, and the reflection plate 13 is inside the conveyance path (second conveyance unit 33). Be placed open. The heating light H1 received by the reflecting plate 13 may pass through the preform P or may directly receive it.
The body Pb below the ridge Ps of the preform P is mainly heated by the heating light H1 emitted from the heating light source 12 and the reflected light H2 reflected from the reflecting plate 13.

In addition, the sterilizing unit 15 provided on the heating unit 11 is provided between the sterilizing light sources 16 and 16 and the sterilizing light sources 16 and 16 forming a pair at the top and bottom and each emitting the sterilizing light V A gas sprayer 17 for spraying a gas G is provided.
The sterilizing light sources 16 and 16 emit sterilizing light V toward the buttocks Ps of the preform P and its vicinity, and the gas sprayer 17 sprays sterilizing gas G toward the buttocks Ps and its vicinity And sterilize the mouth Pm and its vicinity. As shown in FIG. 2, a neck portion Pn and a mouth Pm are included in the vicinity of the mouth Pm. Further, in FIG. 2, the sterilizing light V indicated by a solid line and the sterilizing gas G indicated by a three-dot chain line are drawn as being irradiated and sprayed radially.
As described above, by configuring the sterilization unit 15 to sandwich the gas sprayer 17 with the pair of sterilization light sources 16 and 16 at the top and bottom, an effect of realizing non-uniform sterilization is exhibited.

As the sterilizing light sources 16 and 16, it is preferable to use an ultraviolet light emitting unit that emits ultraviolet light as the sterilizing light V. As the ultraviolet light, so-called UV-C having a wavelength of 200 to 280 nm is used from the viewpoint of sterilization performance. Is preferred.
The sterilizing gas G sprayed from the gas sprayer 17 is preferably a sterilizing gas consisting of a sterilizing agent that generates active oxygen or hydroxyl radical from the viewpoint of the sterilizing performance, hydrogen peroxide (H ₂ O ₂ ) or peracetic acid (CH ₃ C) A germicide consisting of an aqueous solution containing (か ら O) OOH) as a main component is used by spraying.

  As a more specific configuration of the sterilization unit 15, as shown in FIG. 3 (a), a gas sprayer 17 provided with a nozzle 17A continuous in the transport direction and provided above and below the gas sprayer 17 are integrated in the transport direction. Can be configured to include germicidal light sources 16 and 16 composed of ultraviolet lamps connected to one another, and as shown in FIG. 3B, one or both of germicidal light sources 16 and 16 and gas sprayer 17 are divided in the transport direction Can also be provided. Moreover, as shown in FIG.3 (c), it can be set as the sterilizing light sources 16 and 16 which used ultraviolet-ray LED16A, and can also be set as the gas sprayer 17 which used the nozzle 17A of a small diameter.

  Referring to the positional relationship between the preform P to be conveyed and the heat sterilization unit 10 (the heating unit 11 and the sterilization unit 15), the heat sterilization unit 10 is provided on the side of the preform P, and the heating light H1, sterilization is provided. Both the light V and the sterilizing gas G are supplied laterally to the preform P. Further, since the inside of the mouth Pm is held by the holding rod 41, the outer periphery of the preform P is open including the mouth Pm, and the heating light H1, the sterilizing light V, and the sterilization are included in the preform P. There is nothing to prevent gas G from reaching.

  The preform P heat-sterilized by the heat sterilization unit 10 is delivered from the second conveyance unit 33 via the wheel 35 to the molding unit 20 formed of a rotary stretch blow molding apparatus as shown in FIG. 1. The delivered preform P is formed into a bottle B by stretch blow, and the bottle B is transported via the wheel 36 and the wheel 37 to a downstream aseptic filling machine.

Next, the operation and effect of heating and sterilization of the blow molding apparatus 1 according to the first embodiment will be described.
In the blow molding apparatus 1, the preform P held by the container holding means 40 is suitable for molding the body Pb of the preform P by the heating unit 11 while being conveyed through the heating zone by the second conveyance unit 33. It is heated to a temperature, and the body Pb is sterilized by this heating.
In addition, the mouth Pm of the preform P and the vicinity thereof are irradiated with the sterilizing light V from the sterilizing light sources 16 and 16 and are sprayed and disinfected by the sterilizing gas G from the gas sprayer 17. Sterilization of the mouth Pm including the screw and screw bottom is effectively performed.
The sterilizing gas G sprayed to the mouth Pm and the vicinity thereof is decomposed by the irradiation of the sterilizing light V from the sterilizing light sources 16 and 16 and dried, so that the sterilizing agent does not remain in the area, even if Very small amount. In order to make this effect more remarkable, it is preferable to provide the germicidal light sources 16 and 16 and the gas sprayer 17 adjacently to make the area irradiated with the germicidal light V interfere with the area sprayed with the germicidal gas G .

  Here, since the heat sterilization section 10 is provided on the side of the preform P, and both the sterilizing light V and the sterilizing gas G are supplied from the side to the preform P, the mouth of the preform P is obtained. The sterilizing light V and the sterilizing gas G can reach the portion Pm and the outer peripheral surface in the vicinity thereof without difficulty. In addition, since the heating light H1 and the reflected light H2 are also received from the side of the body portion Pb, sterilization can be reliably performed in addition to molding. In particular, according to the present embodiment, since the outer peripheral surface of the preform P is open and there is nothing to prevent the heating light H1, the sterilizing light V and the sterilizing gas G from reaching, the outer peripheral surface of the preform P is It can sterilize more reliably.

  On the other hand, the preform P is heated and sterilized by the heating and sterilizing unit 10 provided over the heating and sterilization area in the process of continuously conveying the heating and sterilization area while being held by the second conveyance unit 33. Therefore, the efficiency in heating and sterilizing a large number of preforms P is good.

  Further, the preform P is conveyed while being rotated around an axis along with the holding rod 41 by the rotation mechanism. Therefore, heating (and sterilization) of the body Pb by the heating unit 11 and irradiation of the sterilizing light V by the sterilization unit 15 and sterilization of the mouth Pm and its vicinity by spraying the sterilizing gas G are performed in the circumferential direction of the preform P. It is done uniformly and effectively.

  As described above, after the body P and the vicinity of the mouth Pm are sterilized, the preform P is delivered to the forming unit 20 and blow molded into the bottle B, but the blow molded bottle B is aseptically And, there is no residual germicide, and it is possible to cope with aseptic filling in an effective state.

  In the present embodiment, when the sterilizing gas G is derived from a sterilizing agent that mainly contains hydrogen peroxide or peracetic acid and generates active oxygen or hydroxyl radical, it is preferable to use ultraviolet light as the sterilizing light V. The sterilizing agent generates active oxygen or hydroxyl radical when irradiated with ultraviolet light, and the bactericidal activity is enhanced by the generated active oxygen or hydroxyl radical, so sterilization of the mouth Pm and its vicinity is more effective. become.

  In the above description, an example in which the sterilizing gas G is sprayed from the gas sprayer 17 provided side by side with the sterilizing light sources 16 and 16 is shown, but the present invention is not limited to this, a place away from the sterilizing light sources 16 and 16 Can also be equipped with a gas sprayer. Also in this case, the mouth Pm and the vicinity thereof may be in the atmosphere of the sterilizing gas G. In particular, when the entire preform P including the body portion Pb as well as the mouth portion Pm and the vicinity thereof is contained in the atmosphere of the sterilizing gas G, the body portion Pb can also be sterilized by the sterilizing gas G.

In the above description, the sterilizing unit 15 is configured of the sterilizing light sources 16 and 16 and the gas sprayer 17. However, depending on the required sterilization level, only the sterilizing light sources 16 and 16 may be provided without the gas sprayer 17. May be The same applies to the second embodiment.
In the above description, the preform P is held on the inner side of the mouth Pm as a form of holding the preform P in the state where the outer peripheral surface is open, but other parts such as the neck Pn are You may support from the inside.

Second Embodiment
Next, a second embodiment of the present invention will be described based on FIGS.
The blow molding apparatus 1 according to the first embodiment includes the heat sterilization unit 10 in which the heating unit 11 and the sterilization unit 15 are adjacent to each other. However, the blow molding apparatus 2 according to the second embodiment includes the heating unit 11 and the sterilization unit 15 Are provided separately. Below, the blow molding device 2 will be described focusing on differences from the blow molding device 1. 4 to 6, the same components as those in FIGS. 1 and 2 described above are denoted by the same reference numerals as in FIGS.
As shown in FIGS. 4 and 5, in the blow molding apparatus 2, only the heating unit 11 is provided where the heat sterilization unit 10 is provided, and the rotary sterilization unit 50 is provided downstream of the heating unit 11. It is provided.

As shown in FIG. 5, the preform P is heated by the heating unit 11 while being conveyed by the second conveyance unit 33. The preform P having passed through the heating unit 11 is delivered to the sterilization unit 50 via the wheel 35.
The sterilization part 50 is equipped with the structure similar to the sterilization part 15 of 1st Embodiment, as shown in FIG.

Next, the operation and effects of the blow molding apparatus 2 according to the second embodiment of the present invention will be described.
In the blow molding device 2, the preform P is delivered to the rotary sterilization unit 50 after the body portion Pb is heated by the heating unit 11. In the sterilization unit 50, while the preform P is rotated by the rotation means, the mouth Pm and the vicinity thereof are irradiated with the sterilizing light V from the sterilizing light sources 16, 16, and the gas sprayer 17 sprays the sterilizing gas G. As a result, sterilization near the mouth Pm is uniformly and effectively performed.
At this time, the sterilizing gas G sprayed in the vicinity of the mouth Pm is decomposed by irradiation of the sterilizing light V from the sterilizing light sources 16 and 16 and dried, so there is no residual bactericidal agent.
The preform P sterilized in the sterilization unit 50 is conveyed to the forming unit 20 through the wheel 38 and thereafter processed in the same manner as in the first embodiment.

  Also in the second embodiment of the present invention, the sterilizing light sources 16 and 16 and the gas sprayer 17 of the heating unit 11 and the sterilization unit 50 are provided on the side of the preform P, and the outer peripheral surface of the preform P is Since it is open, the entire sterilization of the preform P can be reliably performed. Further, since the preform P is heated and sterilized in the process of continuously conveying the second conveyance unit 33 and the sterilization unit 50, the second embodiment also efficiently heats a large number of preforms P. It can be sterilized. Furthermore, since heating and sterilization are performed while the preform P rotates around the axis, heating and sterilization can be performed uniformly and effectively in the circumferential direction of the preform P.

According to the second embodiment of the present invention, the sterilizing light sources 16 and 16 and the gas sprayer 17 do not have the heating unit 11 in the vicinity. Therefore, the number of the installation, the position, the direction of emitting the sterilizing light V, and the direction of spraying the sterilizing gas G are arbitrarily selected, and the recess corresponding to the screw bottom of the opening Pm, the boundary of the opening Pm and the ridge Ps And it is possible to more effectively sterilize the depression corresponding to the boundary between the ridge portion Ps and the neck portion Pn. FIG. 7 shows an example of the direction in which the sterilizing light V is emitted and the direction in which the sterilizing gas G is sprayed. By adopting this direction, the portion can be sufficiently sterilized.
As described above, according to the second embodiment, the degree of freedom in the arrangement of arranging the sterilizing light sources 16 and 16 or the gas sprayer 17 is high, and the arrangement can be appropriately selected depending on the purpose of the sterilization.

  Further, since the sterilizing unit 15 is provided downstream of the heating unit 11, the sterilizing light sources 16 and 16 and the gas sprayer 17 are not affected by the heat generation from the heating unit 11. And the gas sprayer 17 can suppress the performance fall by the influence of heat. However, the present invention allows the sterilizing unit 15 to be provided upstream of the heating unit 11.

  In addition to this, it is possible to select the configuration described in the above embodiment or to appropriately change it to another configuration without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 blow molding apparatus 2 blow molding apparatus 5 clean room 10, 10A, 10B heating sterilization part 11 heating part 12 heating light source 13 reflecting plate 15 sterilization part 16 sterilization light source 17 gas sprayer 20 forming part 30 conveyance part 31 first conveyance part 33 2 Conveying section 33A Forward path 33B Return path 32, 34A, 34B, 35, 36, 37, 38 Wheel 40 Container holding means 41 Holding rod 41A Rod body 41B Lower rod 41C Upper ridge 41D Engaging groove 42 O ring 43 Grip rod 43A Rod body 43B Engaging collar 44 Gripper 45 Guide 46 Belt 50 Sterilizing part B Bottle H1 Heating light H2 Reflected light P Preform Pb Body Pm Mouth Pn Neck Ps Neck

Claims (6)

A blow molding apparatus for obtaining a container by stretch blow molding a heated preform,
A conveyance path for conveying the preform from the upstream side to the downstream side;
A heating unit that heats the preform conveyed along the conveyance path from the side;
A sterilizing unit having a sterilizing light source that sterilizes the preform conveyed along the conveyance path by irradiating sterilizing light from the side to sterilize the preform;
And a forming unit that stretches and blows the preform that has been heated by the heating unit and sterilized by the sterilizing unit,
The preform includes a mouth portion and a body portion, the body portion corresponds to a heating area by the heating portion, and the mouth portion corresponds to a sterilizing light irradiation area by the sterilizing portion,
The heating unit and the sterilizing unit are provided adjacent to mutually different positions in the vertical direction with respect to the preform to be subjected to heating and sterilization ,
The sterilization unit is
A sterilizing gas supply unit for supplying sterilizing gas to a sterilizing area to which the sterilizing light is irradiated;
Blow molding apparatus characterized by In the sterilization section,
The preform held in a state where its outer peripheral surface is open is sterilized.
The blow molding apparatus according to claim 1. The germicidal light source and the germicidal gas supplier are provided adjacent to each other,
The blow molding apparatus according to claim 1 or 2 . The sterilizing gas feeder
Supplying the germicidal gas derived from a germicide producing active oxygen or hydroxyl radicals,
Blow molding apparatus according to any one of claims 1 to 3. The transport path is
Conveying both the heating unit and the sterilizing unit while rotating the preform around its axis;
The blow molding apparatus according to any one of claims 1 to 4 . The transport path has a forward pass and a return pass in part, and both the heating unit and the sterilizing part are provided in the forward pass and the return pass.
The blow molding apparatus according to any one of claims 1 to 4 .

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