JP4059129B2 - Heat crystallization equipment for saturated polyester hollow body - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a heated crystallization apparatus for a saturated polyester hollow body, and more specifically, a bottomed preform made of a saturated polyester such as polyethylene terephthalate or a mouth and neck portion to be sealed with a cap such as a bottle or cup. The present invention relates to a heated crystallization apparatus for a saturated polyester hollow body to be crystallized.
[0002]
[Prior art]
A bottle made of a saturated polyester is usually produced by biaxially stretching blow-molding an amorphous bottomed preform formed by injection molding or the like, leaving a portion to become the mouth and neck.
This kind of bottle has molecular orientation on the shoulder, body and bottom, and has excellent container properties such as transparency, gas barrier properties, strength and impact resistance, and these shoulder, body and bottom. The bottle heat-set has the advantage that when hot-filled, these portions are unlikely to deform due to shrinkage.
[0003]
By the way, since the mouth-and-neck portion of the container remains in an amorphous structure, the entire mouth-and-neck portion or the threaded portion is deformed during hot filling, and the sealing performance is easily lost.
In order to eliminate this defect, a technique for improving the hardness and heat resistance of the mouth and neck by heating and crystallizing the mouth or neck of the preform or the container has been proposed. Further, at this time, it has been proposed that the inner and outer surfaces of the mouth and neck can be heated uniformly by employing a near infrared heater as compared with other heating means (Patent Document 1).
[0004]
Moreover, the conventional heater unit is comprised from the near-infrared heater by which the ceramic coating was given to the counter irradiation side half surface, and the reflecting plate.
This near-infrared heater is provided in two places in the vertical direction at the substantially central portion of the curved surface area of the reflector. Further, the reflecting plate employs a curved surface obtained by dividing a cylinder into two along the central axis and a tunnel shape extending tangentially from both ends of the curved surface.
By setting it as such a shape, the irradiation light irradiated from the near-infrared heater was reflected by the ceramic coating or the reflecting plate, or was directly radiated to the heated portion without being reflected (Patent Document 2). .
[0005]
[Patent Document 1]
Japanese Patent Publication No. 5-9261 [Patent Document 2]
Japanese Examined Patent Publication No. 6-22876 [0006]
By the way, when heated to crystallize a saturated polyester, a very small amount of oligomer (low molecular weight product generated by thermal decomposition of polyester) is generated.
This oligomer is released into the atmosphere from the mouth and neck of a heated polyester hollow body, and when it comes into contact with a low-temperature object, it solidifies on the surface and adheres as a white substance.
In addition, since the reflector of the heater unit reduces the light reflectivity when foreign matter such as dust adheres, it is required to always maintain a clean mirror surface in order to efficiently use the irradiated light. Yes.
[0007]
[Problems to be solved by the invention]
However, in the conventional crystallization apparatus, the vapor of the oligomer generated from the neck and neck of the polyester hollow body that is continuously conveyed and crystallized by heating is filled in the heater unit. For this reason, there is a problem that oligomers adhere to the reflector, energy efficiency is lowered, and running cost cannot be reduced.
In addition, the amount of oligomer attached to the reflector increases with time, so that the light irradiation efficiency changes. According to this change, the output control of the near infrared heater, the mouth and neck of the polyester hollow body, There was a hassle of adjusting the distance and position with the near infrared heater.
Furthermore, oligomers adhering to the reflector cannot be easily removed. To remove them, the production line must be stopped and cleaned or replaced with a new reflector, and the productivity is reduced by stopping the line. There was a problem.
[0008]
Further, if the generated oligomer is forcibly simply sucked, there is a problem that the temperature of the heater unit is lowered and a constant heating temperature cannot be maintained. That is, it is necessary to control the cooling effect by exhaust.
[0009]
In order to solve the above problems, the present invention prevents saturated foreign substances such as oligomers and dust from adhering to the reflector in the heater unit, and can control the temperature of the mouth and neck accurately. An object of the present invention is to provide a heat crystallization apparatus for a hollow body.
[0010]
[Means for Solving the Problems]
In order to achieve this object, the saturated crystallization hollow body heat crystallization apparatus according to claim 1 of the present invention irradiates the neck and neck of the saturated polyester hollow body with light from the heater unit and heats it. An apparatus for heating and crystallizing a saturated polyester hollow body that crystallizes the mouth and neck, forcing a shielding member that covers the mouth and neck and heated air around the mouth and neck from the inside of the shielding member And an exhaust means for exhausting automatically.
If it does in this way, the hot air containing the oligomer which generate | occur | produces when a mouth neck part is heated can be exhausted efficiently.
[0011]
In addition, the saturated polyester hollow body heat crystallization apparatus according to claim 2 of the present invention has a configuration in which an exhaust amount adjusting means is provided in the exhaust means.
If it does in this way, the temperature adjustment of a heating area | region can be performed easily and accurately.
[0012]
In the saturated polyester hollow body heat crystallization apparatus according to claim 3 of the present invention, the shielding member is formed so as to partially cover a holder that holds the saturated polyester hollow body, and air is sucked from the holder side. However, it is configured to exhaust to the opposite holder side.
In this way, it is possible to prevent the oligomer from adhering to the holder and to prevent the temperature of the holder from rising.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
FIG. 1: has shown schematic sectional drawing for demonstrating the structure of the principal part in embodiment of the heating crystallization apparatus of the saturated polyester hollow body concerning this invention.
In the figure, the heat crystallization apparatus 1 irradiates and heats the irradiation light 20 from the near-infrared heater 313 to the mouth portion 11 of the preform 10 of the plastic bottle which is the mouth and neck portion of the saturated polyester hollow body, A heater unit 30 for crystallizing the mouth portion 11 is provided.
Moreover, the heat crystallization apparatus 1 of this embodiment is used as a heating part of the conventional preform crystallization apparatus described above.
[0014]
The heat crystallization apparatus 1 has substantially the same structure as the heating unit described above, and an exhaust port 60 is formed on the upper plate of the shielding plate 317, and an exhaust duct 61 is further attached.
[0015]
The exhaust duct 61 is connected to a blower (not shown) and forcibly exhausts hot air containing oligomers in the heating region 321.
The blower is not particularly limited, and may be a small blower provided in each heater unit 30, for example. Moreover, the large sized air blower which can perform exhaust_gas | exhaustion of all the heater units 30 collectively may be sufficient. Further, even if a dedicated blower is not provided, for example, an exhaust duct 61 may be connected to a common exhaust pipe provided in a factory where the heating and crystallization apparatus 1 is installed. Any configuration may be used.
If it does in this way, the hot air containing the oligomer which generate | occur | produces from the opening part 11 can be exhausted efficiently, without making it contact with the shielding board 319 and the shielding board 317, or hardly contacting, and an oligomer is shielding. Adhering to the plate 319 and the shielding plate 317 can be substantially prevented.
[0016]
Further, when hot air is exhausted from the exhaust port 60, the heat crystallization apparatus 1 has a gap 341 between the heater unit 30 and the shielding plate 317, a gap 342 between the heater unit 30 and the holder 210, and a gap between the holder 210 and the shielding plate 317. From 344, ambient temperature outside air is sucked into the heating region 321. Thereby, the temperature in the heating region 321 can be controlled.
Here, it is preferable that a valve 62 is provided in the exhaust duct 61 as an exhaust amount adjusting means. In this way, by adjusting the exhaust amount, the temperature of the heating region 321 can be adjusted easily and accurately, that is, the cooling effect by exhaust can be positively utilized.
Note that a valve 62 such as a butterfly valve is normally used as the exhaust amount adjusting means, but is not limited to this, and for example, a blower capable of controlling the rotational speed may be used.
[0017]
Further, the shielding plate 317 can exhaust the hot air containing the oligomer in the heating region 321 from the exhaust duct 61 without leaking outside, that is, efficiently.
Furthermore, when the shielding plate 317 covers the mouth portion 11, the heating region 321 can be kept warm. Moreover, it is good to cover the outer surface of the shielding board 317 with a heat-resistant heat insulation member, and thereby, the effect of keeping the heating region 321 warm is improved, and the energy efficiency can be further improved.
[0018]
Thus, according to the heat crystallization apparatus 1 of the present embodiment, the oligomer generated from the mouth portion 11 can be reliably recovered. For example, the oligomer adheres to the shielding plate 317 or the shielding plate 319. And can prevent a decrease in energy efficiency.
Further, the heat crystallization apparatus 1 can prevent the oligomer from adhering to the periphery of the heating region 321 and can maintain the clean state, and the oligomer 11 and other foreign matters do not adhere to the mouth portion 11. Furthermore, the temperature in the heating region 321 can be easily adjusted by providing the valve 62 and adjusting the exhaust amount.
[0019]
As mentioned above, although the preferable embodiment was shown and demonstrated about the heating crystallization apparatus of the saturated polyester hollow body of this invention, this invention is not limited only to embodiment mentioned above, Various in the range of this invention. It goes without saying that changes can be made.
Further, the heating target is not limited to the mouth portion 11 of the preform 10 of the plastic bottle, and may be, for example, the mouth and neck portion of a container other than the plastic bottle.
[0020]
Furthermore, the hot air sucked from the heating region 321 is normally released to the outside air, but is not limited to this. For example, after removing oligomers and other foreign matters contained in the hot air through a filter, Further, it may be configured to circulate in the heating region 321, and in this way, a temperature decrease in the heating region 321 can be suppressed, and energy efficiency can be further improved.
[0021]
【The invention's effect】
As described above in detail, according to the heating and crystallization apparatus for a saturated polyester hollow body in the present invention, the oligomer generated from the mouth and neck is efficiently removed by forcibly exhausting the hot air in the heating region. be able to. In addition, since the oligomer does not adhere to the reflecting plate, it is possible to avoid the problem that the reflectance does not decrease even if it is used for a long period of time, and the energy efficiency decreases.
In addition, by adjusting the exhaust amount of hot air, the temperature in the heating region can be controlled with higher accuracy, stable heating conditions can be realized, and the mouth and neck can be crystallized more uniformly.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view for explaining a configuration of a main part in an embodiment of a heating and crystallization apparatus for a saturated polyester hollow body according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heating crystallization apparatus 10 Preform 11 Mouth part 20 Irradiation light 30 Heater unit 60 Exhaust outlet 61 Exhaust duct 62 Valve 210 Holder 313 Near-infrared heater 317 Shielding board 319 Shielding board 321 Heating area 341,342,344

Claims (3)

A saturated crystallization hollow body heating and crystallization apparatus for crystallizing the mouth and neck by irradiating and heating light from a heater unit to the mouth and neck of a saturated polyester hollow body,
A shielding member covering the mouth and neck;
An apparatus for heating and crystallizing a saturated polyester hollow body comprising exhaust means for forcibly exhausting the heated air around the mouth and neck from the inside of the shielding member. The apparatus for heating and crystallizing a saturated polyester hollow body according to claim 1, wherein the exhaust means is provided with an exhaust amount adjusting means. 3. The saturated polyester according to claim 1, wherein the shielding member is formed so as to partially cover a holder that holds the saturated polyester hollow body, and sucks air from the holder side and exhausts it to the opposite holder side. Heating crystallization equipment for hollow bodies.

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