JP7240698B2 - PET bottle manufacturing equipment - Google Patents

Description

The present invention relates to a PET bottle manufacturing apparatus for manufacturing a PET bottle by molding a preform with an injection molding machine, taking it out and reheating it with a blow molding machine.

Conventionally, there has been known a PET bottle manufacturing apparatus in which a preform is molded by an injection molding machine, taken out and reheated by a blow molding machine to manufacture a PET bottle (see, for example, Patent Document 1).

The blow molding apparatus described in Patent Document 1, as described in the paragraph (0024), circulates a plurality of disk-shaped pallets through a pallet horizontal circulation path while preforms are inverted. It has a horizontal circuit. This pallet horizontal circulation path includes a preform supply section for feeding preforms to each pallet, a heating section for heating the preforms carried on the pallets, and a preform carried on the pallets and heated by the heating section. and a product recovery unit for recovering the products blow-molded in the blow molding unit from pallets.

JP 2004-284016 A

The material of the preform described in Patent Document 1 is supposed to be polyester, polystyrene, polypropylene, polyethylene naphthalate, and polyethylene terephthalate. Here, for example, when blow molding a preform made of polyethylene terephthalate (PET), which is the material of PET bottles, if the preform is heated by a heating device before blow molding, it is heated rapidly or at a high temperature exceeding a certain temperature. , a whitening phenomenon (crystallization phenomenon) occurs, and in the subsequent blow molding, that portion does not swell well, resulting in a defective PET bottle.

In particular, when blow-molding preforms to manufacture PET gallon bottles for water servers, which are much larger than normal PET bottles, the preforms are considerably thicker than the preforms used to make normal PET bottles. is used, the amount of heating increases accordingly.

Therefore, rapid heating to increase production efficiency causes the above-mentioned problems, while gradual heating to suppress the occurrence of whitening requires a considerable amount of time for the heating process, lowering production efficiency. put away. In order to heat while suppressing the occurrence of whitening, it is necessary to heat the preform slowly over a long period of time so that the heat penetrates from the outside to the inside of the preform. The size of itself increases. In addition, the time required for manufacturing the bottle will be extra.

In addition, in order to manufacture a PET bottle with an irregular shape, which is different from a general PET bottle having a substantially constant diameter, such as a three-dimensional imitation of a popular anime character or a famous building as a tourist attraction. A similar problem arises when blow-molding a preform in a mold.

Specifically, when making a PET bottle with an irregular shape, it is often the case that a thicker preform is used than a preform for making a normal PET bottle. Irregularly shaped PET bottles often stretch in a complicated manner vertically and horizontally, so they tend to be thicker than those with simple shapes. Thicker preforms than usual are often used to produce Therefore, in order to sufficiently heat this thick portion, it is necessary to considerably increase the amount of heating in accordance with the thickness of the preform, compared to a normal preform.

If such preforms, which are thicker than preforms for manufacturing ordinary PET bottles, are rapidly heated, the above-described whitening phenomenon (crystallization phenomenon) occurs immediately. Therefore, it is necessary to heat even the thick portion with a heating condition equivalent to that of a normal preform.

As a result, it is necessary to gradually increase the total length of the heating unit that heats while moving on the conveying line while being carried on the pallet. This means that the length occupied by the heating section in the conveying line is considerably increased accordingly. Therefore, the PET bottle manufacturing apparatus itself also becomes considerably large.

As for the size of the apparatus, since the PET bottle manufacturing apparatus is installed in a limited space, it is often the case that an apparatus with a space-saving design is desired rather than a large machine. In addition, although the number of machines is often increased in order to increase the production volume, due to limited space, only a small number of PET bottle manufacturing machines can be installed.

On the other hand, it takes a certain amount of time to heat the preform and blow mold the preform into a PET bottle. As a result, there is a possibility that it will not be possible to respond to the situation where a large amount of PET bottles must be manufactured and delivered in a short period of time.

When so-called mass production, in which a large amount of PET bottles must be manufactured and delivered in a short period of time, is required, it is of course necessary to increase the number of bottles produced per hour. For this reason, mass-production machines with a large number of molds and fast production speed are often used, but in the case of general mass-production machines, the total length of the heating section is lengthened to increase production speed, making the machine larger. end up

In general, when the production speed is increased, if the heating temperature is raised more than usual, the preform will whiten (crystallize) and cannot be blown into the shape of a PET bottle. For this reason, the heating temperature does not change significantly from normal, the speed of the preform passing through the heating section is increased, and the entire length of the heating section must be extended in order to obtain heat penetration from the outside to the inside. However, it has become a problem that it leads to an increase in the size of the machine.

Furthermore, there are also problems related to heat-resistant PET bottles, which are one form of PET bottles. Here, the heat-resistant PET bottle is a PET bottle that can withstand being filled with high-temperature liquid. The difference between heat-resistant PET bottles and ordinary room-temperature bottles is that they do not deform even when filled with high-temperature materials.

The manufacturing process of heat-resistant PET bottles is almost the same as that of ordinary room-temperature bottles, but it is necessary to raise the heating temperature of the preform to the point of whitening (crystallization). There is also a difference in the blow molds used in the blow molding section. While the blow molds for normal temperature bottles are cooled, the blow molds for heat-resistant bottles need to be heated with a temperature controller, etc. .

Crystallized resin such as preforms (polyethylene terephthalate) made from PET bottles softens when heated and can be stretched.

When manufacturing a heat-resistant bottle, it is necessary to take advantage of the above characteristics and blow the preform into a bottle before it completely whitens. The reason for blowing before it is completely whitened is that if it is completely whitened, it will not stretch even if air is introduced, and it will not be possible to make it into a PET bottle product.

In order to increase the heat resistance temperature, the higher the preform heating temperature and the mold temperature during blow molding, the better. This is because when the finished heat-resistant PET bottle approaches whitening (crystallization), the resin itself becomes hard, so even if a high-temperature liquid is added, it will not deform easily. For this reason, the heat-resistant PET bottle has a whiter appearance than the PET bottle normally used at room temperature.

However, it is difficult to penetrate high-temperature heat from the outside to the inside of the preform. Alternatively, because the preform cannot be heated to the point of whitening in order to avoid whitening of the outside of the preform, only bottles with low heat resistance temperatures can be molded.

Because of these problems, conventionally, when manufacturing heat-resistant bottles, it is necessary to go through a complicated manufacturing process that differs from normal temperature bottle manufacturing, and there is a demand for simplifying this process. had been

It is an object of the present invention to efficiently and stably produce high-quality PET bottles without taking extra time by making the heating section as short as possible for any type of PET bottle, and at the same time, reduce the overall size of the PET bottle. To provide a PET bottle manufacturing device designed to save space even in a limited installation space without increasing the size. In addition to this, when the PET bottle is a heat-resistant PET bottle, the object is to provide a PET bottle manufacturing apparatus capable of manufacturing the PET bottle without going through complicated steps.

In order to solve the above-described problems, the PET bottle manufacturing apparatus according to claim 1 of the present invention includes:
In the PET bottle manufacturing equipment that manufactures PET bottles by blow molding,
The PET bottle manufacturing apparatus is
a conveying line for sequentially conveying preforms blow-molded as PET bottles at predetermined intervals;
a preform input unit provided on the upstream side of the transport line for inputting the preform into the transport line;
a PET bottle take-out unit provided on the downstream side of the conveying line for taking out the PET bottles manufactured by the PET bottle manufacturing apparatus;
a blow molding unit provided on the upstream side of the conveying line from the PET bottle take-out unit;
A predetermined amount of heat required for blow molding the preform in the blow molding section is provided on the transportation line between the preform input section and the blow molding section. A preform heating section performed over a section of
a preform blowing unit provided at a predetermined location along the transfer line coming out of the preform heating unit;
A rotating device that constantly rotates the preform in a fixed direction around its axis while the preform is heated over a certain section of the transfer line and while the preform is blown by the preform blower. and
In the preform heating unit, the preform is heated by the heating unit while the preform is being conveyed, and the preform after exiting the heating unit is the PET bottle manufacturing apparatus. With respect to the heated preform which is entirely exposed to the surrounding atmosphere of the preform , the surrounding atmosphere is agitated by the preform air blowing unit while the preform is constantly rotated in a fixed direction around the axis by the transfer line. It is characterized in that the heated preform exposed to the ambient atmosphere is blown with air as a wind .

Moreover, the PET bottle manufacturing apparatus according to claim 2 of the present invention is the PET bottle manufacturing apparatus according to claim 1,
It is characterized in that a preform that can be blow-molded into a PET gallon bottle for a water server can be loaded into the preform loading section.

A PET bottle manufacturing apparatus according to claim 3 of the present invention is the PET bottle manufacturing apparatus according to claim 1,
It is characterized in that a preform that can be blow-molded into a PET bottle having a special shape with an irregular shape different from a PET bottle having a substantially constant diameter can be fed into the preform feeding part.

Further, a PET bottle manufacturing apparatus according to claim 4 of the present invention is the PET bottle manufacturing apparatus according to any one of claims 1 to 3,
In order to enable mass production of PET bottles by the PET bottle manufacturing apparatus, the blow molding section is characterized in that it has a structure capable of blow molding a plurality of PET bottles at once.

Further, according to claim 5 of the present invention, there is provided a PET bottle manufacturing apparatus according to any one of claims 1 to 4,
The PET bottle manufacturing apparatus is characterized in that it can manufacture heat-resistant PET bottles.

In addition, the PET bottle manufacturing method using the PET bottle manufacturing apparatus according to claim 6 of the present invention,
Prepare the PET bottle manufacturing apparatus according to claim 1,
At a preform loading unit provided in the PET bottle manufacturing apparatus, the preforms are sequentially mounted one by one on the opening mounting portion of the mandrel provided in the transfer line provided in the PET bottle manufacturing apparatus,
sequentially conveying the mandrels toward a heating station provided at a predetermined location along the preform conveying line section;
When the mandrels are brought closer to the heating station, the mandrels and the preforms mounted thereon are rotated in a predetermined direction around the axis,
While rotating the preform, it is passed through the preform heating part of the heating station of the PET bottle manufacturing apparatus,
In the process of transporting the heated preform, which has been heated in the heating station and has been exposed to the surrounding atmosphere of the PET bottle manufacturing apparatus after coming out of the heating station, by the preform transport line, While the preform passing through the blowing area of the preform blowing unit provided at a predetermined location along the preform transfer line is constantly rotated in a fixed direction around the axis , the preform is exposed to the ambient atmosphere. is blown to the heated preform exposed to the ambient atmosphere as a wind of air that is agitated ,
The preform subjected to blowing by the blowing unit is moved to a blow molding station and stopped while attached to the mandrel ,
Blow molding the preform to the size of a PET bottle with a blow molding mold provided in a blow molding station of the PET bottle manufacturing apparatus,
moving the blow-molded PET bottle to a PET bottle take-out station on the transfer line;
The PET bottles are sequentially taken out by a PET bottle take-out unit provided in a blow molding station of the PET bottle manufacturing apparatus.

According to the present invention, it is possible to efficiently and stably produce high-quality PET bottles without taking extra time by making the heating section as short as possible for any kind of PET bottle, and at the same time, the overall size of the PET bottle is reduced. It is possible to provide a PET bottle manufacturing apparatus with a more space-saving design even in a limited installation space without increasing the size of the apparatus. In addition to this, when the PET bottle is a heat-resistant PET bottle, it is possible to provide a PET bottle manufacturing apparatus capable of manufacturing the PET bottle without going through complicated steps.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows roughly the structure of the PET bottle manufacturing apparatus which concerns on the 1st Embodiment of this invention. FIG. 2 is a schematic view of a preform and a mandrel passing between a heating section and an air blowing section of the PET bottle manufacturing apparatus shown in FIG. 1, viewed from the upstream side of a transfer line; FIG. 3 is an explanatory view showing a heating state of the preform in FIG. 3. It is explanatory drawing which shows the heating state from a heating part to the preform shown in FIG. 3, and the air blowing state from an air blowing part corresponding to FIG. FIG. 4 is a plan view schematically showing the configuration of a PET bottle manufacturing apparatus according to a second embodiment of the present invention;

Next, the configuration of the PET bottle manufacturing apparatus 1 according to the first embodiment of the present invention will be described. The PET bottle manufacturing apparatus 1 is a type of manufacturing apparatus that manufactures a PET bottle by reheating a preform that has been molded by an injection molding machine and taken out by a blow molding machine.

Hereinafter, a PET bottle manufacturing apparatus 1 according to a first embodiment of the present invention (hereinafter simply referred to as "this embodiment" or "embodiment" as appropriate) will be described in detail based on the drawings. FIG. 1 is a plan view schematically showing the configuration of a PET bottle manufacturing apparatus 1 according to a first embodiment of the present invention. FIG. 2 is a schematic view of the preform 20 and the mandrel 100 passing between the heating section and the blowing section of the PET bottle manufacturing apparatus 1 shown in FIG. FIG. 3 is an explanatory view showing the heating state of the preform 20 in FIG. 2 from the heating unit and the blowing state from the blowing unit. FIG. 4 is an explanatory diagram showing the heating state of the preform 20 shown in FIG. In FIG. 1, the number of mandrels 100 is shown to be less than the number shown in order to facilitate understanding of the invention and to simplify the illustration. number of mandrels 100 are conveyed by a conveying line 200 at predetermined intervals from each other.

A PET bottle manufacturing apparatus 1 according to the present embodiment (hereinafter referred to simply as "PET bottle manufacturing apparatus 1") is a PET bottle manufacturing apparatus that manufactures PET bottles 30 by blow molding, and has a horizontal top surface when installed. A base 11, a transfer line 200 for sequentially transferring the preforms 20 placed on the upper surface of the base 11 and placed on the mandrel 100 at predetermined intervals, and the preforms 20 are sequentially loaded onto the mandrels 100 of the transfer line 200. A preform loading section 300, a preform heating section 400 that sequentially heats the preforms 20 that are loaded into the preform loading section 300 and transported by the conveying line 200, and a preform wind disposed opposite the preform heating section 400. A blow molding unit 600 that sequentially blow molds the preforms 20 that are heated in the preform heating unit 400 and sent by the conveying line 200; It has a PET bottle take-out unit 700 for sequentially taking out the PET bottles 30 sent by the transport line 200 .

A heated air exhaust section 800 is provided in a portion where the preform heating section 400 and the preform blowing section 500 are arranged. In addition, a transit wind blowing section 900 is provided in the vicinity of the transfer line 200 between the preform heating section 400 and the blow molding section 600 .

In the following description, the preform loading section 300 and a part of the transport line 200 corresponding thereto will be referred to as a preform loading station, the preform heating section 400 and the preform blowing section 500, and part of the transport line 200 sandwiched therebetween. a preform heating/airing station, a blow molding section 600 for blow-molding the preform 20 and a part of the transport line 200 corresponding thereto a preform blow molding station, and a transit air blowing section 900 and a transport corresponding thereto. Portions of line 200 are arbitrarily referred to as transit stations.

As shown in FIG. 1, the transport line 200 has a track shape in a plan view, and the mandrels 100 that move while holding the preforms 20 and the PET bottles 30 in an inverted state are arranged at predetermined intervals. It is designed to move counterclockwise in the figure at a high speed. It should be noted that the shape of the transfer line and the moving direction of the mandrel in this embodiment are only examples of the present invention, and the transfer line in FIG. 1 is merely an example. That is, the transfer line may naturally have a shape other than the track shape in plan view, and it goes without saying that the direction of movement of the mandrel may also be clockwise in the figure.

The transfer line 200 includes a preform transfer line section 210 from the preform input section 300 to the blow molding section 600 (the section in which only the inner circle of the double circle indicating the mandrel 100 in the figure is hatched), and the blow molding Section 600 to PET bottle unloading unit 700 is PET bottle conveying line section 220 (the section where the entire double circle indicating mandrel 100 in the figure is hatched), and PET bottle unloading unit 700 to preform loading unit 300. consists of three sections, an empty mandrel transfer line section 230 (the section where the entire double circle indicating the mandrel 100 in the figure is not hatched).

A rotating device 250 is provided below the transfer line 200 defined between the preform heating section 400 and the preform blowing section 500 and the transfer line 200 near the transit blowing section.

The rotator 250 rotates the mandrel 100 while heating the preform 20 over a certain section of the transfer line 200 at the preform heating and blowing station and at the transit station to rotate the preform 20 to its position. It is designed to rotate around an axis.

The mandrel 100 comprises a housing 110 and a mouth mounting portion 120 detachably fixed to the housing 110, as shown in FIG.

The mouth attachment part 120 is inserted into the mouth part 21 of the preform 20, and the two are tightly fitted together . It is designed to be held by

In addition, below the mandrel 100, there is provided a rotation connecting part 130 for rotating the mandrel 100 itself in conjunction with rotating devices provided in the heating/air blowing station and the transit station.

The preform loading section 300 inserts the mouth portion 21 of the preform 20 into the mouth mounting portion 120 of the empty mandrel 100 when the empty mandrel 100 on the transfer line reaches the preform loading station, thereby loading the preform 20 onto the mandrel 100. It plays the role of sequentially supplying a large number of preforms 20 to the next heating/air blowing station in an inverted state. Various well-known devices such as a dedicated loading device and an orthogonal coordinate type robot are used for the preform loading unit 300 .

The preform heating section 400 is provided on one side of the transfer line 200 of the heating/air blowing station occupying a certain section of the transfer line 200 . The preform heating unit 400 includes heaters 411, 412, 413, 414, 415, and 416 (410) of a certain length extending horizontally across the front side of the transfer line 200 in FIG. As indicated by , it has a structure in which a plurality of (in this embodiment, six, which is a smaller number for the sake of understanding the invention and facilitating illustration) are arranged at predetermined intervals in the vertical direction. The height of the lowermost heater 411 is such that the preform 20 placed on the mandrel 100 and passing through the heating/air blowing station, excluding the mouth portion 21, of the preform 20 passes through the heating and blowing station. Suitable height. In practice, the number of heaters differs depending on the model of the PET bottle manufacturing apparatus. Generally, heaters of a larger number than in the present embodiment, such as 10 or more, are arranged at predetermined intervals, and preforms having different heights are used. It is designed to be able to handle the heating of

In addition, a heater 410 is provided with a heating unit internal air blowing unit 420 on the back side thereof. The air blowing unit 420 in the heating unit is composed of a fan and a blower, and the air heated in each heater 410 is efficiently blown over the preform 20 in the heating/air blowing station without being stuck in the heater. It plays a role of heating (see the thin wavy arrow from right to left in FIG. 4).

The amount of heating by which the preform heating unit 400 heats each preform 20 can be set relatively high by adjusting the heater. At least part of the preform 20 is whitened (crystallized) when the preform blower 500 is not operated, but when the preform blower 500 is operated, such whitening (crystallization) occurs even with high-temperature heating. No amount of heating can be done. That is, compared to a conventional PET bottle manufacturing apparatus that does not have a preform air blowing unit 500, the amount of heating for each preform 20 in the transfer line 200 in the heating/air blowing station can be increased accordingly.

The preform blowing section 500 is provided on the other side of the preform heating section 400 with respect to the transfer line 200 of the heating/air blowing station occupying a certain section of the transfer line 200 . The preform air blowing unit 500, although not shown in detail here, has a blower 510 such as a fan, a blower, a compressor, etc., and the air flow blown by the blower 510 locally hits the entire preform. It has a wind blowing slit guide 520 for

As shown in FIG. 3, the air blowing slit guide 520 is arranged with a plurality of partition plates 521 to 527 facing in the same direction at predetermined intervals. The air blown from the blower 510 passes between the respective partition plates 521 to 527 forming the air blowing slit guide 520, is rectified, and is locally blown from each slit guide over the entire preform. (See the white arrows shown between the air blowing slit guides 520 in FIG. 3 and the white arrows pointing from left to right shown in the air blowing slit guides 520 in FIG. 4).

In this embodiment, for the purpose of facilitating the understanding and illustration of the invention, the intervals between the wind blowing slits are widened and the number of the wind blowing slits is small, but in reality, the configuration is limited to such a form. Instead, more air slit guides are provided in consideration of the effect of air blowing on the preform.

That is, the air blown toward each preform 20 through the air blowing slit guide 520 is heated by the heater and blown over the entire preform 20 moving on the transfer line 200 while rotating about its axis. It is designed to take This serves to suppress the occurrence of a whitening phenomenon (crystallization phenomenon) due to a rapid temperature rise of the surface of the preform 20 heated by each heater 410, and also reduces the temperature difference between the inner and outer surfaces of the preform. A preform state that is optimal for bottle molding can be achieved.

The amount of air blowing to each preform 20 by the preform blowing unit 500 is such that if the preform blowing unit 500 is not operated, at least a part of the preform 20 is whitened (crystallized) due to the high temperature heating from the preform heating unit 400 . ), however, if the preform blowing unit 500 is operated, the blowing amount can be adjusted so that such whitening (crystallization) does not occur even with high-temperature heating.

Note that the preform blowing unit 500 does not perform automatic inverter control in this embodiment. The reason for this is that when automatic inverter control is performed, the motor is automatically controlled according to the temperature inside the preform heating unit 400, and the air volume changes, so that the surface temperature of the heated preform 20 also varies. be. Therefore, in the present embodiment, the strength of the wind applied to the preforms 20 can be adjusted manually, and the conditions are set so that the same air volume is always applied when the preforms 20 of the same lot are heated and the wind is applied. are aligned. However, the air may be applied to the preform 20 during heating by a control method other than this embodiment, as long as the effect of the present invention can be sufficiently exhibited.

The heated air exhaust section 800 is installed above the space between the preform heating section 400 and the preform blowing section 500 . The heated air exhaust section 800 plays the role of sucking in the entire air after heating the preform 20 generated in the heating/air blowing station and discharging it to the outside (in FIG. up arrow).

In this embodiment, as described above, the mouth portion 21 of the preform 20 (the drinking mouth portion of the PET bottle 30 after blow molding) faces downward. and the preform wind blower 500 . However, if the mouth portion 21 of the preform 20 (the drinking mouth portion of the PET bottle 30 after blow molding) is directed upward according to the structure of the PET bottle manufacturing apparatus 1, the heated air may flow into the mouth of the preform 20. In some cases, a heated air exhaust unit 800 is installed in the heating/air blowing station so as to exhaust the heated air downward so as not to hit the unit 21 .

The transit air blowing section 900 is in a standby position from the heating/air blowing station to the blow molding station, that is, while the preform 20 attached to the mandrel 100 one ahead is being blow-molded by the blow molding section 600 . The preform 20 is provided in the transit station as a position where the mandrel 100 is held, and the preform 20 just before it comes out from the heating/air blowing station after being heated and enters the molds 611, 612 (610) of the blow molding section 600 is further blown with air. It plays the role of guessing. As with the preform air blower 500, the transit air blower 900 uses an appropriate air blower such as a fan, a blower, or a compressor.

Since it is feared that the heat penetrates into the preform 20 at the transit station and the whitening phenomenon (crystallization phenomenon) progresses, depending on the crystallization state of the preform 20 immediately before blow molding, the transit wind blowing section Determine whether or not to wind at 900 . That is, when it is clear that the preform 20 will not be whitened (crystallized) at the transit station, there is no need to operate the transit wind blower 900 .

In FIG. 1, a part of the vicinity of the transfer line 200 between the preform heating section 400, the preform blowing section 500, and the blow molding section 600 is a position where the preform 20 temporarily stands by before blow molding. Although the transit wind blowing part 900 is provided at the transport line 200, it may be provided entirely along the transport line 200 in the vicinity thereof.

The blow molding section 600 is provided so as to straddle the transfer line 200 . When the preform 20 before blow molding is attached to the mandrel 100 from the upstream side of the transfer line 200 and moves, the halves 611 and 612 of the mold 610 are separated from each other as shown in FIG. Then, the mandrel 100 and the preform 20 fitted thereon are positioned and stopped in the PET bottle molding station as prescribed. After these stops, the halves 611 and 612 of the mold 610 come into contact with each other to be in a closed state, and the mold 610 for blow molding is constructed. Then, after blow molding is performed in this state to mold the PET bottle 30 from the preform 20, the halves 611 and 612 of the mold 610 are separated from each other again to open the PET bottle 30 after blow molding. 100 is moved toward the PET bottle take-out portion 700 .

Contrary to the preform loading section 300, the PET bottle take-out section 700 removes the PET bottles 30 that have been molded as the PET bottles 30 in the blow molding section 600 and that move on the transport line 200 while attached to the mandrels 100 at the PET bottle take-out station. It plays the role of extracting it as a product. As with the preform loading section 300, the PET bottle loading section 700 employs various known devices such as a dedicated loading device and an orthogonal coordinate type robot.

The base 11 is provided with a control device (not shown in the drawing) for synchronizing and moving each component of the PET bottle manufacturing apparatus 1 according to the present embodiment described above at predetermined operation timings, and a control device (not shown in the drawing). An input device and a display device (not shown in the drawing) are provided for the operator of the device 1 to operate the device and to check the operation status of the device.

Next, a method for manufacturing the PET bottle 30 using the PET bottle manufacturing apparatus 1 according to this embodiment will be described. First, the preforms 20 are sequentially inserted one by one into the mouth mounting portion 120 of each mandrel 100 in the preform loading section 300 . Then, it is transported toward the heating/air blowing station along the preform transport line section. Each mandrel 100 is rotated by the rotating device 250 when approaching the heating/air blowing station. Along with this, the preforms 20 fitted in the mouth mounting parts 120 also rotate about their axes together with the mouth mounting parts 120 .

The preform 20 rotates and passes between the preform heating section 400 and the preform air blowing section 500 of the heating/air blowing station. While the preform 20 is passing through the heating/air blowing station, a heating amount larger than usual is applied to the extent that at least the surface of the preform 20 is whitened (crystallized) if there is no local blowing from the preform air blowing section. added by each heater 410 .

That is, while such a heating amount is applied from the preform heating unit 400, the whitening phenomenon (crystallization phenomenon) of the preform 20 is prevented by the local blowing from the preform blowing unit 500, and the heating and blowing are performed. The preforms 20 pass through the application station in sequence.

In this way, the air after heating the preforms 20 in the heating/air blowing station is always discharged through the heated air exhaust section 800, and the preforms 20 passing through the heating/air blowing station are exposed to the preforms 20 described above. The amount of heating and the amount of blowing air of the preform heating unit 400 that barely suppresses the whitening phenomenon (crystallization phenomenon) of the preform 20 is always supplied to the preform 20 in a well-balanced manner. Since the heated air is discharged to the side opposite to the mouth portion 21 of the preform 20, only the portion of the preform 20 to be heated can be heated.

The length of the preform heating section 400, which constitutes the heating/air blowing station, which is a characteristic part of the present invention, is shorter than that of the conventional PET bottle manufacturing apparatus, so the preform 20 passing through this section can be heated in a short time. It is efficiently heated to the extent that blow molding is possible without causing whitening (crystallization).

The preform 20 heated at the heating and blowing station remains attached to the mouth mount 120 of the mandrel 100 until the preceding preform 20 at the transit station is blown at the blow molding station. . Even at this time, the mandrel 100 is rotated by the rotating device 250 so that the preform 20 also continues to rotate together with the mouth mounting portion 120 . A transit wind blower 900 provided at the transit station prevents whitening (crystallization) from occurring at the transit station by blowing wind over the entire circumference around the axis of the preform 20 .

After blow molding of the preceding preform 20 is completed, the blow mold 610 of the blow molding station is opened, and the subsequent heated preform 20 is blown together with the mandrel 100 while attached to the mouth fitting 120. Move to a station and stop. Then, the blow-molding mold 610 is closed, and the preform 20 is blow-molded to the size of the PET bottle 30 .

The blow-molded PET bottle 30 moves along with the mandrel 100 along the PET bottle conveying line section of the conveying line 200 to the PET bottle take-out station, with the drinking mouth portion fitted in the mouth portion mounting portion 120 . While the mandrel 100 is stopped at the PET bottle take-out station, the PET bottles 30 are sequentially taken out as products from the mouth mounting part 120 of the mandrel 100 by the PET bottle take-out part 700 .

The empty mandrel 100 from which the PET bottle 30 has been taken out from the mouth mounting part 120 moves through the empty mandrel transfer line section of the transfer line 200 to the preform loading station again, and repeats the series of steps described above.

In this way, the heating station, which has been a bottleneck in the production efficiency and downsizing of the PET bottle manufacturing apparatus, is replaced with a heating/air blowing station different from the conventional one in the present invention. To achieve miniaturization of a bottle manufacturing apparatus itself.

Next, in the PET bottle manufacturing apparatus according to the present invention, the above-described embodiment is taken as an example. will be described in more detail.

The problem with applying heat to a preform made of polyethylene terephthalate (PET) is that if it is rapidly heated to a temperature above a certain temperature during the heating process, the surface will crystallize (whiten), and the subsequent blowing will be a problem. It will not stretch any further during the molding process. That is, a preform in which the crystallized portion is no longer elongated in the blow molding process is blow molded as a defective PET bottle that does not have a specified shape. Therefore, there is a limit to how the temperature of the heater can be raised in the heating process, and it is necessary to provide a somewhat long heating station along the transfer line.

In particular, in the case of a thick preform, it is necessary to rotate the mandrel and sufficiently heat the thick portion of the preform itself from the surface in the thickness direction to the inner surface with the heater. Therefore, if the surface portion of the preform is heated to a high temperature by a heater so as to sufficiently heat the inner surface, a temperature difference occurs between the surface and the inner surface of the preform. That is, the gradient of temperature change from the surface to the inside becomes large.

When the inner surface of the preform is heated to a predetermined temperature, a temperature gradient in the thickness direction inevitably occurs due to the fact that only the surface of the preform is heated, and the temperature of the surface of the preform becomes high. Only the surface may be whitened (crystallized).

If even a part of the preform is whitened (crystallized) and does not expand as specified, the PET bottle does not have the desired shape and becomes a defective product, which must be discarded as it is or cut into flakes again for recycling. , the product yield is reduced.

Conventionally, therefore, when heating thick preforms or when increasing the production speed, the length of the heating station must be considerably increased along the transport line. As a result, the size of the PET bottle manufacturing apparatus itself is increased, and there is a limit to the length of the heating station for increasing the production speed, which limits the production efficiency of PET bottles.

However, according to the present invention, the preform is heated by the heater in the heating/air blowing station, and at the same time, air is locally applied to the preform from the air blowing slit guide of the preform blowing section, thereby reducing the thickness of the preform. Even with a thick preform, the temperature difference between the inner and outer surfaces can be reduced, and a state in which the inner surface reaches a predetermined temperature without whitening (crystallization) can be created without spending extra time.

Furthermore, the effect is enhanced because the air is applied even in the transit (standby) section defined until the preform exiting the heating/air blowing station enters the mold for blow molding. be able to.

That is, in the present invention, the preform air blowing portion as described above creates air blowing portions in the heating/air blowing station and the transit station, and forcibly cools the surface of the preform, thereby increasing the heater temperature of the heating device. It is of great technical significance that the inventor paid attention to the fact that whitening (crystallization) can be prevented from occurring on the surface of the preform even if the is increased.

In addition, since the preform is constantly rotated by the rotating device during the air blowing, the heat of the heater is uniformly applied to the outer peripheral surface of the preform, and the air blown out from the guide slit of the air blowing portion uniformly hits the preform.

As a result, the heat of the heater is applied to the preform from the surface, and in the process of penetrating into the inside of the preform, the surface of the preform becomes hot and whitening (crystallization) is prevented. be able to.

In addition, by blowing air onto the surface of the preform, even if the preform is heated at a higher temperature than before, it is possible to conduct heat to the inside of the preform more quickly than before while suppressing whitening (crystallization) of the surface. As a result, the temperature difference between the surface and the inner surface becomes smaller. As a result, it is possible to heat the preform at a high temperature with a gentle gradient of temperature change from the surface to the inner surface without causing whitening (crystallization) on the surface of the preform.

Therefore, even a preform having a large thickness can be heated to a stable preform at a high temperature as a whole, and blow molding can be easily performed thereafter.

In addition, in order to prevent whitening (crystallization) due to the high temperature of the surface of the preform as in the conventional technology, the air blowing technique unique to the present invention slowly heats the preform at a temperature that does not cause whitening. Since there is no need to take measures to permeate heat, the heater can be heated to a high temperature and the heating time can be shortened. As a result, the heater zone can be shortened, so that the power consumption of the heating device can be reduced.

Further, according to the present invention, a large advantage is obtained by achieving space saving of the PET bottle manufacturing apparatus. In other words, according to the conventional PET bottle manufacturing apparatus, when a thick preform or the like is made into a PET bottle, the heating time must be long, and accordingly, a long heating station is required. In the case of the invention, since the heating time can be shortened in the heating process of the preform, the heating/air blowing station can be shortened.

Further, according to the PET bottle manufacturing apparatus of the present invention, stable blow molding can be performed even if the thickness of the preform is large, and it is possible to manufacture PET bottles with a good yield. As a result, preforms for manufacturing various types of PET bottles can be fed into this PET bottle manufacturing apparatus. A specific example is a thick preform that can be blow-molded into a PET gallon bottle for a water server. In addition, a PET bottle with a deformed shape different from a general PET bottle having a substantially constant diameter, that is, a deformed shape that three-dimensionally imitates, for example, a popular anime character or a famous building as a tourist attraction. This PET bottle manufacturing apparatus can also be used for thick preforms that can be blow-molded into PET bottles.

In addition, in the case of the PET bottle manufacturing apparatus according to the present invention, if there is a demand to install the PET bottle manufacturing apparatus in a limited space, the apparatus can be designed to be more space-saving than a large machine.

That is, there is no need to increase the total length of the heating section to increase the production speed, unlike in the case of a general mass-production machine, and as a result, the size of the machine is not increased. Specifically, in the case of conventional general manufacturing equipment, if the heating temperature is raised more than usual in order to increase the production speed, the preform will whiten (crystallize), blow and swell to the shape of a PET bottle. was difficult. In order to prevent this, the heating temperature does not change significantly from normal, the speed of the preform passing through the heating section is increased, and the entire length of the heating section is extended to obtain heat penetration from the outside to the inside. This inevitably leads to an increase in the size of the machine. However, in the case of the present invention, it is possible to heat the preforms at a high temperature by means of the air blowing device, and by shortening the heater zone, while taking advantage of the characteristics corresponding to the space-saving design, in other words, a large amount of preforms can be produced more than before. It can be heated in a short time, placed in a large number of molds for mass production, and blow-molded.

Furthermore, the PET bottle manufacturing apparatus according to the present invention is also suitable for manufacturing heat-resistant PET bottles. Specifically, it is possible to solve the problems related to heat-resistant PET bottles, which are one form of PET bottles, as described in detail in the Problems to be Solved. That is, according to the present invention, high-temperature heat can permeate from the outside to the inside of the preform, unlike the conventional method, so that the whitening of the outside progresses before the heat from the outside is transmitted to the inside as in the conventional method, and blow molding is possible. It is possible to solve the problem that only bottles with low heat resistance temperatures can be molded because the preform cannot be inflated to the shape of a PET bottle and the preform cannot be heated to the point of whitening to avoid whitening of the outside of the preform. . As a result, in the case of the present invention, there is no need to go through a complicated manufacturing process that is different from normal temperature bottle manufacturing, which has been a problem in the past when manufacturing heat-resistant bottles, and this process can be simplified. .

Next, a supplementary explanation will be given on the scope of application of the PET bottle manufacturing apparatus according to the present invention. First, I will explain the point that it can be applied to large-capacity bottles such as water servers. Water server (3 gallon, 5 gallon, etc.) bottles are manufactured by stretching the preform considerably.

When inflating a large-capacity bottle such as a gallon bottle, the corners are formed by heating the preform at a high temperature. In many cases, it has been extremely difficult to obtain ideal molding conditions in the past, but if the air blowing technique according to the present invention is used, such problems can be solved at once.

It is also applicable to PET bottles with a high stretch ratio (PET bottles that require a large amount of preform stretching). Thick preforms, which are used to manufacture bottles with complex shapes, take time for heat to permeate to the inside. By using constant high-temperature preforms, PET bottle molding with stable quality becomes possible.

In addition, the scope of the present invention is not limited to the embodiments described above. That is, the material of the preform is not limited to the one used in the above-described embodiment. For example, instead of the preform made of polyethylene terephthalate, it may be made of polypropylene (PP), which may cause crystallization during the heating process. It is also possible to put the preform into the preform introduction part of the PET bottle manufacturing apparatus according to the present invention.

Also, the scope of the present invention is not limited to the shapes and numbers of the constituent elements in the above-described embodiments. For example, the entire conveying line is installed above the PET bottle manufacturing equipment, and mandrels for attaching the preforms and PET bottles are provided downward at predetermined intervals on the conveying line so that the preforms and PET bottles can be suspended along the conveying line. It is also applicable to a PET bottle manufacturing apparatus in which these are moved by means of a lever. In this case, the heating/air blowing station may have a structure in which the heated air exhaust part is located on the opposite side of the mouth of the preform.

Further, although it is not always necessary to provide an air blowing guide slit in the preform air blowing portion, it is preferable to provide an air blowing guide slit so that air can be efficiently blown toward the preform.

Also, in FIG. 1, the preform blowing unit 500 is provided along the mandrel conveying direction with a length approximately equal to that of the heater 410 of the preform heating unit 400. Needless to say, the length of the reform wind blowing portion 500 can be appropriately changed, such as shortening it to some extent, as long as the action can be sufficiently exhibited.

Further, if the preform air blowing section is provided in the heating/air blowing station, it is not always necessary to provide the transit air blowing section between the heating/air blowing station and the blow molding station. However, by providing the transit wind blower in part or all of the vicinity of the transport line between them, the above-described effects of the present invention can be exhibited more effectively.

Further, in order to further enable mass production of PET bottles by the PET bottle manufacturing apparatus according to the present invention, the blow molding section may have a structure capable of blow molding a plurality of PET bottles at once. Specifically, for example, a structure is conceivable in which a plurality of molds are arranged in series in a blow molding section, and preforms are simultaneously blow-molded in the respective molds to form PET bottles. Since the preform heating part is shorter than conventional mass production machines, it is possible to handle mass production even with space-saving design manufacturing equipment compared to conventional machines.

According to the PET bottle manufacturing apparatus of the present invention, instead of the preform made of polyethylene terephthalate, a preform that may undergo crystallization during the heating process can be loaded into the preform loading section. Specifically, for example, by inserting a preform made of thermoplastic resin such as polypropylene (PP) into the preform input part, a PET bottle that can be used as a beverage container or food container made of polypropylene can be made into a small size. It is possible to mass-produce by the PET bottle manufacturing equipment.

Finally, a second embodiment capable of exhibiting the effects of the present invention will be described. FIG. 5 is a plan view schematically showing the configuration of a PET bottle manufacturing apparatus according to the second embodiment of the present invention. Since the PET bottle manufacturing apparatus according to the second embodiment basically has a configuration equivalent to that of the PET bottle manufacturing apparatus according to the first embodiment, the configuration of the two is different from that of the second embodiment. Only the characteristic parts of are described, and the other configurations are denoted by the same reference numerals in the drawings and detailed description thereof is omitted.

In FIG. 5, the number of mandrels 100 is shown to be less than shown for ease of understanding of the invention and simplification of illustration. A large number of mandrels 100 are transported by a transport line 200 at short intervals from each other.

In the PET bottle manufacturing apparatus 1 according to the first embodiment, the preform blowing unit 500 is provided so as to blow air onto the preform 20 while the preform 20 is being heated by the preform heating unit 400 . rice field. A transit air blowing section 900 is provided as an auxiliary air blowing device at a predetermined position in the transit zone from the time the preform 20 is heated until it enters the blow molding section 600 . The transit air blowing section 900 serves only as an auxiliary blowing air. It has been explained that the typical transit wind blower 900 is not necessarily required.

On the other hand, in the case of the PET bottle manufacturing apparatus 2 according to the second embodiment, as shown in FIG. A transit zone wind blowing portion 950 is provided as a main wind blowing portion in this embodiment at the position where the plate 550 is provided and the transit wind blowing portion 900 that played an auxiliary role in the first embodiment is provided. ing.

The heating acceleration reflector 550 is provided on the opposite side of the heating heater 410 via the transport line 200, and serves to efficiently apply heat to the preform 20 by reflecting the heat of the heater 410. . Note that the heating acceleration reflector 550 of the preform heating unit 400 is provided in the second embodiment for the time being, and is not necessarily required depending on the heating condition of the preform 20 in carrying out the present invention.

The structure of the preform heating section 400 in the second embodiment is the same as that in the first embodiment, except that a heating promoting reflector 550 is provided instead of the preform blowing section 500. Description of each component is omitted.

The transit zone wind blowing section 950 has the same basic configuration as the transit wind blowing section 900 of the first embodiment. It is possible to reliably take countermeasures at low cost in the event that whitening (crystallization) occurs suddenly. In FIG. 5, only one transit zone wind blower 950 is shown for convenience of explanation and to facilitate understanding of the invention. Therefore, in practice, the arrangement of the mandrel 100 is not limited to that shown in FIG.

Thus, without providing the preform blowing unit 500 in the preform heating unit 400 , the transit zone wind is placed at a predetermined position between the preform heating unit 400 heating the preform 20 and the preform 20 entering the blow molding unit 600 . Even if the abutting portion 950 is provided, the effects unique to the present invention can be fully exhibited. This point will be described below.

As to why the wind blower only in the transit zone, which is the configuration unique to the second embodiment, is effective, the observations are as follows.
(1) Although whitening (crystallization) does not occur during heating in the heating zone of the preform, whitening (crystallization) may occur in the transit zone. Specifically, this is because it often whitens (crystallizes) immediately after leaving the preform heating section.
(2) The preform is heated in the preform heating section, and the heat is trapped in the preform in the latter half of the heating section. ) has been confirmed by the inventor. Therefore, in order to prevent such a phenomenon, it is currently considered as a very effective means to prevent whitening (crystallization) by applying wind only in the transit zone.
(3) When molding a preform into a PET bottle, it is desirable that there is no temperature difference (constant temperature) between the inner and outer surfaces of the preform in order to perform ideal molding as designed. That is, it is preferable that there is no temperature gradient from the outer peripheral surface to the inner peripheral surface of the preform (inclination of temperature decrease), or that it is as small as possible, even considering various factors that actually affect this.

Therefore, if the preform heating section is not provided with a preform blower section, when the preform is heated in the preform heating section, the heat is transmitted in one direction from the outside to the inside of the preform, causing the preform to Outside and inside temperatures may not be constant when exiting the heating section. This tends to become more pronounced as the thickness of the preform increases.

Therefore, the state in which the temperature of the outside of the preform is higher than the temperature of the inside of the preform can be corrected by blowing air from the outside in the transit zone immediately after the preform has left the preform heating section. By bringing the temperatures close to each other, the effects of the present invention can be fully exhibited for the same reason as in the first embodiment, in which the preform heating section blows air against the preform using the preform blowing section. That is, whitening (crystallization) occurs in the preform heating section and subsequent transit zone, as in a conventional PET bottle manufacturing apparatus that does not have an air blowing section, and bottle molding defects occur because the temperature difference between the inner and outer surfaces is not constant. can be prevented from occurring.

For the reasons described above, even if the preform heating section 400 is not provided with the preform air blowing section 500 as in the first embodiment, and instead the transit zone air blowing section 950 is provided in the transit zone, the present invention can be applied. It is possible to fully exhibit the effect.

As a specific configuration of the transit zone wind blowing section, the installation position of the transit zone wind blowing section 950 representatively shown in FIG. and from this starting point along the conveying line 200 towards the blow molding section 600 of sufficient length to prevent the above-described whitening (crystallization) of the preforms. You can take any form. In this case, the length should be determined through simulation, field verification, etc., taking into consideration the amount and speed of the wind applied by the transit zone wind blower 950 .

According to the PET bottle manufacturing apparatus according to the second embodiment of the present invention, an existing PET bottle manufacturing apparatus, that is, a manufacturing apparatus in which a preform heating unit is not provided with a preform blowing unit, is provided with a transit zone blowing unit. It can be retrofitted. As a result, all preforms pass through the heating process in a shorter time than before by raising the temperature of the heater of the conventional preform heating device and increasing the moving speed of the mandrel along the transfer line in the heating device. You will be able to

In other words, in such a state, there is a risk that the preform will whiten (crystallize) immediately after leaving the preform heating apparatus, or that the temperature gradient of the heat distribution between the outside and the inside of the preform will be large. However, the existing PET bottle manufacturing apparatus can be retrofitted with a transit zone wind blower as in the second embodiment of the present invention. By doing so, it becomes possible to apply air to the preform in the transit zone after the preform exits the preform heating device by means of the air blowing unit in the transit zone. problems can be avoided.

As described above, according to the second embodiment of the present invention, by retrofitting the preform blowing unit to an existing PET bottle manufacturing apparatus, as a further effect, the heating process time in the preform heating device of the manufacturing apparatus can be shortened. can be shortened. This allows them to share the special benefit of being able to efficiently produce more PET bottles in a given amount of time.

Reference Signs List 1, 2 PET bottle manufacturing apparatus 11 Base 20 Preform 21 Mouth 30 PET bottle 100 Mandrel
REFERENCE SIGNS LIST 110 housing 120 mouth mounting part 130 rotary connection part 200 transfer line 210 preform transfer line section 220 PET bottle transfer line section 230 empty mandrel transfer line section 250 rotating device 300 preform loading section 400 preform heating section 411, 412, 413 , 414, 415, 416 (410) Heater 420 Heating part inner air blowing part 500 Preform air blowing part 510 Blower 520 Air blowing slit guide 521 to 527 Partition plate 550 Heating acceleration reflector 600 Blow molding part 610 (for blow molding) Mold 611, 612 half (mold)
700 PET bottle take-out unit 800 Heated air exhaust unit 900 Transit wind blower 950 Transit zone wind blower

Claims (6)

In the PET bottle manufacturing equipment that manufactures PET bottles by blow molding,
The PET bottle manufacturing apparatus is
a conveying line for sequentially conveying preforms blow-molded as PET bottles at predetermined intervals;
a preform input unit provided on the upstream side of the transport line for inputting the preform into the transport line;
a PET bottle take-out unit provided on the downstream side of the conveying line for taking out the PET bottles manufactured by the PET bottle manufacturing apparatus;
a blow molding unit provided on the upstream side of the conveying line from the PET bottle take-out unit;
A predetermined amount of heat required for blow molding the preform in the blow molding section is provided on the transportation line between the preform input section and the blow molding section. A preform heating section performed over a section of
a preform blowing unit provided at a predetermined location along the transfer line coming out of the preform heating unit;
A rotating device that constantly rotates the preform in a fixed direction around its axis while the preform is heated over a certain section of the transfer line and while the preform is blown by the preform blower. and
In the preform heating unit, the preform is heated by the heating unit while the preform is being conveyed, and the preform after exiting the heating unit is the PET bottle manufacturing apparatus. With respect to the heated preform which is entirely exposed to the surrounding atmosphere of the preform , the surrounding atmosphere is agitated by the preform air blowing unit while the preform is constantly rotated in a fixed direction around the axis by the transfer line. 1. A PET bottle manufacturing apparatus characterized in that the heated preform exposed to the ambient atmosphere is exposed to air as a wind of air . 2. The PET bottle manufacturing apparatus according to claim 1, wherein a preform that can be blow-molded into a PET gallon bottle for a water server can be loaded into the preform loading unit. 2. The pet according to claim 1, wherein a preform that can be blow-molded into a PET bottle having a special shape with an irregular shape different from a PET bottle having a substantially constant diameter can be introduced into the preform introduction part. bottle making equipment. In order to enable the mass production of PET bottles by the PET bottle manufacturing apparatus, the blow molding section has a structure capable of blow molding a plurality of PET bottles at once. Item 4. The PET bottle manufacturing apparatus according to any one of items 3. 5. The PET bottle manufacturing apparatus according to claim 1, wherein the PET bottle manufacturing apparatus is capable of manufacturing heat-resistant PET bottles. Prepare the PET bottle manufacturing apparatus according to claim 1,
At a preform loading unit provided in the PET bottle manufacturing apparatus, the preforms are sequentially mounted one by one on the opening mounting portion of the mandrel provided in the transfer line provided in the PET bottle manufacturing apparatus,
sequentially conveying the mandrels toward a heating station provided at a predetermined location along the preform conveying line section;
When the mandrels are brought closer to the heating station, the mandrels and the preforms mounted thereon are rotated in a predetermined direction around the axis,
While rotating the preform, it is passed through the preform heating part of the heating station of the PET bottle manufacturing apparatus,
In the process of transporting the heated preform, which has been heated in the heating station and has been exposed to the surrounding atmosphere of the PET bottle manufacturing apparatus after coming out of the heating station, by the preform transport line, While the preform passing through the blowing area of the preform blowing unit provided at a predetermined location along the preform transfer line is constantly rotated in a fixed direction around the axis , the preform is exposed to the ambient atmosphere. is blown to the heated preform exposed to the ambient atmosphere as a wind of air that is agitated ,
The preform subjected to blowing by the blowing unit is moved to a blow molding station and stopped while attached to the mandrel ,
Blow molding the preform to the size of a PET bottle with a blow molding mold provided in a blow molding station of the PET bottle manufacturing apparatus,
moving the blow-molded PET bottle to a PET bottle take-out station on the transfer line;
A PET bottle manufacturing method using a PET bottle manufacturing apparatus, wherein the PET bottles are sequentially taken out by a PET bottle take-out unit provided in a blow molding station of the PET bottle manufacturing apparatus.

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