JP5578397B2 - Plastic bottle manufacturing method, bottle product manufacturing method, and plastic bottle manufacturing apparatus - Google Patents

Description

  The present invention relates to a plastic bottle manufacturing method, a bottle product manufacturing method, and a plastic bottle manufacturing apparatus.

  Conventionally, a PET beverage product is produced by filling a PET (polyethylene terephthalate) bottle with a soft drink such as coffee or tea. Such PET beverage products are widely sold in retail stores and vending machines.

  Such a PET bottle is formed by softening a test tubular parison generally called a preform by heating with a heater, then inflating with high-pressure air, and biaxially stretching blow-molding.

JP 2006-264721 A

  In recent years, it has been desired to reduce the weight of plastic bottles (ie, preforms) by reducing the amount of plastic materials used in plastic bottles. However, when the thickness of the entire preform is reduced in order to reduce the weight of the plastic bottle, the thickness of the plastic bottle is inevitably reduced as a whole, so that the strength of the plastic bottle is reduced.

  Therefore, when molding a plastic bottle from a preform, it is desirable to keep the portion that is likely to affect the strength of the plastic bottle relatively thick while thinning the portion that is less likely to affect the strength of the plastic bottle.

  In order to realize this, an attempt has been made to generate a temperature distribution in the preform by adjusting the output of a heater for heating the preform before blow molding. However, due to the heat conduction of the preform itself, it is difficult to produce a clear temperature distribution in the preform simply by adjusting the output of the heater in this way.

  The present invention has been made in consideration of such points, and by spraying a cooling fluid mainly on the portion of the preform that is desired to be thickened, the temperature of the preform is partially reduced, It is an object of the present invention to provide a plastic bottle manufacturing method, a bottle product manufacturing method, and a plastic bottle manufacturing apparatus capable of controlling the thickness of the plastic bottle.

The present invention relates to a plastic bottle manufacturing method, a preparatory step of preparing a preform, a heating step of heating the preform, and blow molding of the preform heated in the heating step using a blow molding die A cooling fluid is sprayed along a circumferential direction on a desired portion of the preform after the heating step and before the blow molding step, to reduce the temperature of the desired portion of the preform , in the step of spraying a cooling fluid, a manufacturing method for a plastic bottle, wherein Rukoto blowing a cooling fluid into the preform from 2 or more positions with different height from each other.

The present invention relates to a plastic bottle manufacturing method, a preparatory step of preparing a preform, a heating step of heating the preform, and blow molding of the preform heated in the heating step using a blow molding die A cooling fluid is sprayed along a circumferential direction on a desired portion of the preform after the heating step and before the blow molding step, to reduce the temperature of the desired portion of the preform, In the step of spraying the cooling fluid, the preform is rotated along its central axis.

  The present invention is a bottle product manufacturing method comprising a manufacturing process of manufacturing a plastic bottle by a method of manufacturing a plastic bottle, and a filling process of filling the contents in the plastic bottle.

The present invention relates to a plastic bottle manufacturing apparatus, a supply device for supplying a preform, a transport device for transporting a preform supplied from the supply device, a heating device for heating the preform transported by the transport device, And a blow molding device that blow-molds the preform heated by the heating device using a blow molding die. The preform is disposed between the heating device and the blow molding device and is transported by the transport device. Is provided with a cooling fluid spraying device for spraying a cooling fluid along the circumferential direction to reduce the temperature of the desired portion of the preform , and the cooling fluid spraying device has two or more positions at different heights. A plastic bottle manufacturing apparatus having a plurality of fluid spraying portions for spraying a cooling fluid .

  According to the present invention, the fluid spraying portion of the cooling fluid spraying device is composed of a cooling fluid spraying bar extending in the horizontal direction along the conveying direction of the preform between the heating device and the blow molding device. This is a bottle manufacturing apparatus.

  In the present invention, the heating device has a plurality of heater portions arranged in the vertical direction, and the fluid spraying portion of the cooling fluid spraying device is provided between the plurality of heater portions. This is a bottle manufacturing apparatus.

  As described above, according to the present invention, during the heating process or after the heating process and before the blow molding process, the cooling fluid is sprayed along the circumferential direction on the desired portion of the preform, Since the temperature of the desired portion is reduced, the cooling fluid can be sprayed mainly on the portion of the plastic bottle after molding which is desired to be thickened, and the thickness of the plastic bottle can be controlled. In particular, control the wall thickness for heated bottles that require a high preform temperature, lighter bottles that are difficult to control wall thickness, HDPE bottles and PP bottles with narrow blow molding conditions. be able to.

FIG. 1 is a front view showing a preform. FIG. 2 is a front view showing a plastic bottle. FIG. 3 is a bottom view showing the plastic bottle (viewed in the direction of arrow III in FIG. 2). FIG. 4 is a horizontal sectional view showing a plastic bottle (a sectional view taken along line IV-IV in FIG. 2). FIG. 5 is a plan view showing a plastic bottle manufacturing apparatus according to an embodiment of the present invention. 6 is a vertical sectional view (sectional view taken along the line VI-VI in FIG. 5) showing the plastic bottle manufacturing apparatus according to the embodiment of the present invention. FIG. 7 is a vertical sectional view (sectional view taken along line VII-VII in FIG. 5) showing the plastic bottle manufacturing apparatus according to the embodiment of the present invention. FIG. 8 is a perspective view showing an air blowing device of a plastic bottle manufacturing apparatus according to an embodiment of the present invention. FIG. 9 is a schematic view of an injection molding apparatus for producing a preform. FIGS. 10A to 10E are views showing a method for manufacturing a plastic bottle according to an embodiment of the present invention. FIG. 11 is a vertical sectional view showing a plastic bottle manufacturing apparatus according to a modification of the embodiment of the present invention (a diagram corresponding to FIG. 6).

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 11 are diagrams showing an embodiment of the present invention.

Preform Configuration First, an outline of a preform will be described with reference to FIG.

  A preform 10 shown in FIG. 1 is formed between a mouth portion 11 having a circular opening 11a formed at the upper end, a bottomed cylindrical preform body 12, and the mouth portion 11 and the preform body 12. And a flange portion 13 protruding outward. A male screw portion 14 is formed on the outer periphery of the mouth portion 11, and an annular protrusion 15 is provided over the entire periphery of the mouth portion 11 between the male screw portion 14 and the flange portion 13 in the outer periphery of the mouth portion 11.

  This preform 10 is produced by injection molding a synthetic resin pellet. As such a synthetic resin material, a polyester resin composed of a saturated dicarboxylic acid and a saturated dihydric alcohol can be applied. Of these, saturated dicarboxylic acids include terephthalic acid, isophthalic acid, phthalic acid, naphthalene-1,4- or 2,6 dicarboxylic acid, diphenyl ether-4,4′-dicarboxylic acid, diphenyldicarboxylic acids, diphenoxyethanediethanedicarboxylic acid. Aromatic dicarboxylic acids such as acids, aliphatic dicarboxylic acids such as adipic acid, sebacic acid, azelaic acid, decane-1,10-dicarboxylic acid, and the like can be used. In addition, saturated dihydric alcohols include fats such as ethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, hexamethylene glycol, dodecamethylene glycol, and neopentyl glycol. Group glycol, 2,2-bis (4′-β-hydroxyethoxyphenyl) propane, other aromatic diols, and the like can be used. As the polyester resin composed of such saturated dicarboxylic acid and saturated dihydric alcohol, it is preferable to use polyethylene terephthalate (PET) composed of terephthalic acid and ethylene glycol. In addition to PET, it can also be applied to PE, PP, PS, and PLA.

Configuration of Plastic Bottle and Bottle Product Next, the configuration of the plastic bottle and bottle product produced using the preform described above with reference to FIGS. 2 to 4 will be described.

  The plastic bottle 20 shown in FIGS. 2 to 4 is obtained by biaxially stretch-blowing the preform 10 described above. The plastic bottle 20 is formed between a mouth part 21 having a circular opening 21a formed at the upper end, a bottle body 22 connected to the mouth part 21, and between the mouth part 21 and the bottle body 22, and protrudes outward. And a flange portion 23.

  Among these, the external thread part 24 engaged with the external thread part of the cap which is not shown in figure is formed in the outer periphery of the opening part 21. As shown in FIG. Further, an annular protrusion 25 is provided over the entire circumference of the mouth 21 between the male screw portion 24 and the flange portion 23 in the outer circumference of the mouth 21.

  The bottle body 22 includes a shoulder portion 26 extending from the mouth portion 21, a body portion 27 having a plurality of concavo-convex panel portions 27 a provided continuously to the shoulder portion 26 and formed at equal intervals in the circumferential direction, The bottom portion 28 is provided continuously with the portion 27 and includes an indented recess 28a and an annular grounding surface 28b formed on the outer periphery of the recess 28a. Of these, the shoulder portion 26 has an upper circumferential protrusion 26 a that is formed adjacent to the body portion 27 and slightly protrudes outward. The bottom portion 28 has a lower circumferential protrusion 28c that is formed adjacent to the body portion 27 and slightly protrudes outward. A neck portion 30 is formed between the shoulder portion 26 and the flange portion 23.

  The shape of the bottle body 22 may be any shape as long as the preform body 12 is formed by biaxial stretch blow molding, and is limited to the shape shown in FIGS. It is not a thing.

  Further, a bottle product 60 is constituted by the plastic bottle 20, the contents such as a beverage filled in the plastic bottle 20, and a cap for sealing the plastic bottle 20.

  The plastic bottle 20 can also be formed as a two-layer or three-layer multilayer molded bottle. That is, gas barrier properties such as MXD6, MXD6 + cobalt salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate) are obtained by two-color extrusion molding or two-color injection molding. A multilayer bottle having gas barrier properties and light shielding properties may be formed by extrusion molding a three-layer preform as a light shielding resin (intermediate layer) and then blow molding.

  Furthermore, by depositing an inorganic oxide such as silica or alumina or amorphous carbon on the inner wall of the bottle container, the gas barrier property can be improved while maintaining transparency. When coating means are used, gas barrier properties are improved by coating thermosetting cross-linked coatings of polyhydric amines with aromatic polyhydric epoxy compounds reacted with metaxylenediamine and epichlorohydrin, and PVOH. Can be made. When PVOH is coated, gas barrier properties are reduced due to moisture absorption. Therefore, it is preferable to coat a moisture-proof resin such as a polyolefin resin thereon. Any one kind of such gas barrier property improving means may be used, but the gas barrier property can be further improved by combining two or more means.

Plastic Bottle Manufacturing Apparatus Next, the configuration of the plastic bottle manufacturing apparatus 70 will be described with reference to FIGS.

  As shown in FIG. 5, the plastic bottle manufacturing apparatus 70 includes a supply device 71 that supplies the preform 10 and a transport device 72 that transports the preform 10 supplied from the supply device 71.

  Among these, the conveying device 72 has a substantially racetrack shape, and can continuously convey a large number of preforms 10 in a certain direction (clockwise direction in FIG. 5). That is, as shown in FIG. 6, the transport device 72 has a plurality of transport mandrels 73 corresponding to the respective preforms 10, and each preform 10 is supported by the corresponding mandrels 73. And the preform 10 is conveyed in the arrow direction of FIG. 5, rotating in a fixed direction.

  As shown in FIG. 5, a plurality of heating devices 74 that heat the preform 10 being conveyed by the conveying device 72 are disposed around the conveying device 72. As shown in FIG. 6, each heating device 74 includes a heater attachment portion 74 b and a plurality of heater portions 74 a that are attached to the heater attachment portion 74 b and arranged in the vertical direction. And the preform 10 in conveyance is heated with the heat from each heater part 74a.

  Further, as shown in FIG. 5, a transport rotary 75 and a blow molding device 76 are provided in the vicinity of the exit side of the transport device 72. Among them, the transport rotary 75 is a device for transporting the preform 10 heated on the transport device 72 to the blow molding device 76. Then, the preform 10 from the transport rotary 75 is sent to the blow molding device 76 and blow molded using the blow molding die 76a in the blow molding device 76, whereby the plastic bottle 20 is produced.

  An aseptic filling machine 90 is connected to the blow molding device 76 via air conveying means or neck conveying means 77. Among these, the air conveyance means or the neck conveyance means 77 conveys the plastic bottle 20 molded by the blow molding device 76 to the aseptic filling machine 90. The air conveying means is means for conveying the plastic bottle 20 into the aseptic filling machine 90 by hooking the neck portion 30 of the plastic bottle 20 on the rail. The neck conveying means means that the plastic bottle 20 is moved through the disk wheel. It is a means for conveying into the aseptic filling machine 90. The aseptic filling machine 90 is a device that fills the plastic bottle 20 with a sterilized beverage (content).

  Incidentally, in the present embodiment, as shown in FIG. 5, an air spraying device (cooling) is provided between the heating device 74 on the most downstream side in the transport direction of the preform 10 and the blow molding device 76 (or the transport rotary 75). Fluid spraying device) 80 is provided. The air blowing device 80 blows air C along a circumferential direction to a desired portion of the preform 10 conveyed by the conveying device 72, and sets the temperature of the desired portion of the preform 10 heated by the heating device 74. This is a selective reduction.

  As shown in FIG. 7 and FIG. 8, the air spray device 80 includes two fluid spray parts 81 arranged at positions different from each other, and air such as a compressor connected to the two fluid spray parts 81. And a supply device 82. Among these, the fluid spraying part 81 is composed of an air spraying bar (cooling fluid spraying bar) that extends in the horizontal direction along the conveying direction of the preform 10 (hereinafter also simply referred to as the air spraying bar 81). On the surface of each air blowing bar 81, a plurality of blowing holes 81a for blowing air C at a predetermined interval are formed. In addition, it is preferable that the diameter of each blowing hole 81a shall be (phi) 0.1 mm or more and (phi) 1.0 mm or less.

  The distance between the blowout hole 81a and the preform 10 is preferably 5 mm to 30 mm. When this distance is shorter than 5 mm, it is necessary to change the position of the air spraying device when forming a preform having a large trunk diameter. On the other hand, when this distance is longer than 30 mm, the temperature of the preform 10 cannot be lowered sufficiently. The time for blowing the air C onto the preform 10 is preferably set to 1.0 to 5.0 seconds. When the time for blowing the air C is shorter than 1.0 second, the temperature of the preform 10 cannot be lowered sufficiently. On the other hand, when the time for blowing the air C is longer than 10.0 seconds, the temperature of the part of the preform 10 that does not need to be lowered is lowered due to the heat conduction of the preform 10.

  Note that the number of air blowing bars 81 is not limited to two, and may be any number of one or more depending on the location where the temperature of the preform 10 is to be lowered. Further, the air blowing bar 81 may be movable in the vertical direction so as to correspond to various shapes of the preform 10. Furthermore, in the present embodiment, the air C from the air blowing bar 81 blows out in the horizontal direction, but the present invention is not limited thereto, and the air C may be blown out in an oblique direction.

  Furthermore, the cooling fluid sprayed from the cooling fluid spraying device 80 may be made of a gas other than air, or may be made of a liquid such as water. In addition, the temperature of the cooling fluid is not limited, but generally a normal temperature is used.

Next, a plastic bottle manufacturing method according to the present embodiment will be described with reference to FIGS. 5, 9, and 10. Here, for convenience, a case where a preform composed of a single layer is used as the preform 10 will be described as an example.

  First, as shown in FIG. 9, a hopper 41 containing PET (polyethylene terephthalate) pellets 41a, an injection molding machine 42 connected to the hopper 41, and an injection mold 43 connected to the injection molding machine 42 are used. A preform injection molding apparatus 40 is configured. In FIG. 5, the pellet 41 a in the hopper 41 is heated and melted and pressurized by the injection molding machine 42, and then the pellet 41 a is injected into the injection mold 43. The preform 10 is obtained in the injection mold 43 by such high temperature injection molding (preparation process: see FIG. 10A).

  Next, the preform 10 is conveyed to the plastic bottle manufacturing apparatus 70 shown in FIG. Next, the preform 10 is supplied from the supply device 71 to the transport device 72 in the plastic bottle manufacturing apparatus 70.

  Subsequently, the preform 10 is heated by the plurality of heating devices 74 while being transported by the transport device 72 while being supported by the transport mandrel 73 (heating step: see FIG. 10B). During this time, in the heating step shown in FIG. 10B, the preform 10 is uniformly heated in the circumferential direction by the heater portion 74a of the heating device 74 while rotating along the central axis.

  In addition, it is preferable that the heating temperature of the preform 10 in a heating process shall be 95 degreeC thru | or 130 degreeC. If the heating temperature is less than 95 ° C., it is difficult to mold the plastic bottle 20 in the blow molding process. On the other hand, when the heating temperature exceeds 130 ° C., the plastic bottle 20 has a problem called whitening (crystallization).

  After the heating step, the heated preform 10 is sent to the blow molding device 76 by the transport device 72 and the transport rotary 75 (see FIG. 5). During this time, the preform 10 is blown with air C along the circumferential direction by the two air blowing bars 81 of the air blowing device 80 (see cooling fluid spraying process: FIG. 10C). .

  This air C is intensively sprayed on the portion of the plastic bottle 20 after blow molding to be thickened. Thereby, the thickness of the plastic bottle 20 can be controlled. That is, by blowing air C, the temperature of the heated preform 10 where air C is blown decreases. The portion of the preform 10 where the temperature has decreased is relatively difficult to stretch when blow-molded thereafter, and thus becomes thicker than its surroundings. The portion of the plastic bottle 20 to be thickened is, for example, a portion of the plastic bottle 20 that is desired to increase strength, specifically, a portion that is in contact with another plastic bottle at the time of sale (for example, the above-described upper circumferential protrusion) Part 26a and lower circumferential protrusion 28c).

  The degree to which the temperature of the preform 10 is lowered is determined by, for example, the distance between the preform 10 and the air blowing bar 81, the length of the air blowing bar 81 along the conveying direction of the preform 10, and the air blowing bar 81. It can be controlled by appropriately adjusting the number and diameter of the blowout holes 81a, the conveying speed of the conveying device 72, the pressure of the air C, and the like.

  The preform 10 is preferably rotated at least two times along the central axis A of the preform 10 while the air C is blown by the air blowing bar 81 of the air blowing device 80. Thereby, the thickness of the plastic bottle 20 after blow molding can be made uniform in the circumferential direction.

  Next, the preform 10 sent to the blow molding device 76 via the transport rotary 75 is inserted into the blow molding die 76 a of the blow molding device 76. Thereafter, along with the longitudinal stretching by the stretching rod inserted into the preform 10, high-pressure air G is supplied into the preform 10 to perform biaxial stretching blow molding (blow molding step: FIG. 10 (d)). By such blow molding, the plastic bottle 20 is obtained from the preform 10 (FIG. 10E).

  Next, the plastic bottle 20 is conveyed from the blow molding device 76 (blow molding process) into the aseptic filling machine 90 (filling process) by the air conveying means or the neck conveying means 77.

  Thereafter, the plastic bottle 20 is filled with a bactericidal agent in the aseptic filling machine 90, and the inside of the plastic bottle 20 is kept sterile. Thereafter, the plastic bottle 20 is filled with a beverage (content) sterilized in the aseptic filling machine 90 (filling step). Further, it is sealed with a sterilized cap and further labeled. Thereafter, the bottle product 60 manufactured in this way is shipped to a retail store or the like. As described above, the manufacturing process for manufacturing the plastic bottle 20 (FIGS. 10A to 10E) and the filling process for filling the contents in the plastic bottle 20 are performed continuously.

  Thus, according to the present embodiment, before the blow molding step, air C is sprayed along the circumferential direction on the desired portion of the preform 10 to reduce the temperature of the desired portion of the preform 10. Portions (for example, the upper circumferential protrusion 26a and the lower circumferential protrusion 28c) that are desired to be thickened in the plastic bottle 20 after molding can be thickened with priority. In this way, the thickness of the plastic bottle 20 can be easily controlled.

  In particular, according to the present embodiment, a portion of the plastic bottle 20 that comes into contact with another plastic bottle at the time of sale (upper circumferential protrusion) by spraying the cooling fluid from two positions having different heights. 26a and the lower circumferential projection 28c) can be made thicker.

Modification Next, a modification of the present embodiment will be described with reference to FIG. The modification of the present embodiment shown in FIG. 11 is different in that the air spraying device is incorporated in the heating device instead of being provided between the heating device and the blow molding device. This is the same as the embodiment shown in FIGS. In FIG. 11, the same parts as those in the embodiment shown in FIGS. 1 to 10 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the modification of the present embodiment shown in FIG. 11, an air spraying device (cooling fluid spraying device) 80 is incorporated in the heating device 74. That is, the air spray device 80 includes two air spray portions (fluid spray portions) 85, and each air spray portion 85 is provided between the plurality of heater portions 74 a of the heating device 74. Further, by providing two air spraying portions 85, it is possible to spray air (cooling fluid) at normal temperature from two positions having different heights from the preform 10.

  In this case, air is blown along the circumferential direction to a desired portion of the preform 10 during the heating step, and the temperature of the desired portion of the preform 10 is lowered. As a result, it is possible to increase the thickness of the plastic bottle 20 after molding in a focused manner. Moreover, since the air spraying part 85 of the air spraying apparatus 80 is integrated in the heating apparatus 74, the plastic bottle manufacturing apparatus 70 can be comprised compactly.

  In addition, you may combine this modification and embodiment shown in FIG. 1 thru | or FIG. That is, the air blowing device 80 may be provided between the heating device 74 and the blow molding device 76, and the air blowing device 80 may be incorporated in the heating device 74.

  6, 7, 10, and 11, the preform 10 is illustrated with the mouth portion 11 facing downward, but the present invention is not limited thereto, and the mouth portion 11 is facing upward. The preform 10 may be conveyed.

  Next, specific examples when producing plastic bottles for warming sales according to the present invention will be described.

  First, a preform 10 shown in FIG. 1 was produced by injection molding based on the following conditions.

Overall height of preform 10: 85 mm
Outer diameter of preform body 12: φ22.3 mm
Inner diameter of mouth 11: φ20.6 mm
Preform 10 weight: 22.7 g
Injection molding machine: IN-90 (manufactured by Kortec)

  The preform 10 was a multilayer preform, and the layer structure of the preform body 12 was as follows.

PET layer: CB651G (manufactured by Totobo)
Core layer: MX nylon (registered trademark) S6007 (Mitsubishi Gas Chemical) mixed with cobalt stearate (Wako Pure Chemical Industries)

  Next, the plastic bottle 20 was produced from each preform 10 using the plastic bottle manufacturing apparatus 70 shown in FIG. In this case, each preform 10 was processed according to the following conditions (Example 1, Example 2, Comparative Example 1).

Example 1
After the preform 10 was heated by the heating device 74, air C at normal temperature was sprayed on a specific portion of the preform 10 along the circumferential direction. In this case, the air blowing bar 81 was installed at a position 5 mm from the preform 10, and air C at room temperature was sprayed onto the preform 10 for 4.0 seconds.

(Example 2)
After the preform 10 was heated by the heating device 74, air C at normal temperature was sprayed on a specific portion of the preform 10 along the circumferential direction. In this case, the air blowing bar 81 was installed at a position 30 mm from the preform 10, and air C at room temperature was sprayed onto the preform 10 for 1.0 second.

(Comparative Example 1)
Instead of blowing the air C by the air blowing bar 81, the heating device 74 was shielded by a black plate in which cold water was circulated during heating by the heating device 74, and a part of the preform 10 was partially covered.

  Next, the plastic bottle 20 was produced by blow-molding each of these preforms 10 based on the following conditions.

Blow molding device 76: BLOMAX 16D (manufactured by SIG)
Overall height of plastic bottle 20: 132 mm
Body diameter of body part 27: φ66 mm
Outer diameter of ground plane 28b: φ45mm
Depth of recess 28a: 20mm

Example 1
As a result, for the preform 10 of Example 1, the thickness of the portion where the air C was sprayed was about 0.32 mm, and the thickness was about 0.07 mm thicker than when the air C was not sprayed.

(Example 2)
Moreover, about the preform 10 of Example 2, the thickness of the location which sprayed the air C became about 0.28 mm, and the thickness became about 0.03 mm thick compared with the case where the air C is not sprayed.

(Comparative Example 1)
On the other hand, in the preform 10 of Comparative Example 1, the thickness of the portion where the air C was sprayed was about 0.26 mm, and no significant change was observed in the thickness.

DESCRIPTION OF SYMBOLS 10 Preform 11 Mouth part 12 Preform main body 20 Plastic bottle 21 Mouth part 22 Bottle main body 26 Shoulder part 27 Body part 28 Bottom part 40 Injection molding apparatus 60 Bottle product 70 Plastic bottle manufacturing apparatus 71 Supply apparatus 72 Conveyance apparatus 73 Conveyance mandrel 74 Heating device 75 Transport rotary 76 Blow molding device 76a Blow molding die 80 Air spraying device (cooling fluid spraying device)
81 Air spray bar (air spray part, cooling fluid spray bar)
85 Air spraying part (cooling fluid spraying part)
90 Aseptic filling machine

Claims (6)

In the plastic bottle manufacturing method,
A preparation process for preparing a preform;
A heating step for heating the preform;
A blow molding step of blow molding the preform heated in the heating step using a blow molding die,
After the heating step and before the blow molding step, the cooling fluid is sprayed along the circumferential direction on the desired portion of the preform to reduce the temperature of the desired portion of the preform ,
In the step of spraying a cooling fluid, a manufacturing method of a plastic bottle, wherein Rukoto blowing a cooling fluid into the preform from different heights 2 or more positions with one another. In the plastic bottle manufacturing method,
A preparation process for preparing a preform;
A heating step for heating the preform;
A blow molding step of blow molding the preform heated in the heating step using a blow molding die,
After the heating step and before the blow molding step, the cooling fluid is sprayed along the circumferential direction on the desired portion of the preform to reduce the temperature of the desired portion of the preform,
In the step of spraying a cooling fluid, characterized and to pulp las tic bottle manufacturing method of a rotating along the preform to its central axis. A manufacturing process for manufacturing a plastic bottle by the method for manufacturing a plastic bottle according to claim 1 or 2 ,
A bottle product manufacturing method comprising a filling step of filling a plastic bottle with contents. In plastic bottle manufacturing equipment,
A supply device for supplying the preform;
A transport device for transporting the preform supplied from the supply device;
A heating device for heating the preform conveyed by the conveying device;
A blow molding device for blow molding a preform heated by a heating device using a blow molding die;
Cooling fluid that is disposed between a heating device and a blow molding device and sprays a cooling fluid along a circumferential direction to a desired portion of the preform conveyed by the conveying device to reduce the temperature of the desired portion of the preform. A fluid spraying device is provided ,
The cooling fluid spraying apparatus has a plurality of fluid spraying parts that spray cooling fluid from two or more positions having different heights from each other . Fluid blowing of the cooling fluid spray apparatus of claim 4, wherein in that it consists of cooling fluid blowing bar extending in the horizontal direction along the conveying direction of the preform between the heating device and a blow molding device Plastic bottle manufacturing equipment. Heating device has a plurality of heater units arranged in the vertical direction, the fluid blowing unit of the cooling fluid spray apparatus of claim 4, wherein a is provided between the plurality of heater section Plastic bottle manufacturing equipment.

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