JP4074400B2 - Air conditioner for injection stretch blow molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner for an injection stretch blow molding machine, and more particularly to an air conditioner that performs air conditioning in a molding work space of an injection stretch blow molding machine.
[0002]
[Background Art and Problems to be Solved by the Invention]
In general, when molding a container made of polyethylene terephthalate (PET), it is known to injection-mold a preform and blow-mold the preform into a container shape.
[0003]
When this preform is injection-molded, the temperature of the injection mold must be cooled to about 10 to 20 ° C.
[0004]
For this reason, for example, in a hot and humid environment such as summer, condensation may occur on the injection mold, which may affect the moldability of the preform.
[0005]
Therefore, when a molding machine such as a PET container or preform is introduced, it is desirable to manage the factory environment with air conditioning equipment.
[0006]
However, the introduction of air conditioning equipment for environmental management of the entire factory is expensive.
[0007]
Therefore, a compact air conditioner, in particular, an optional air conditioner that air-conditions the molding work space surrounded by the safety cover is provided in the molding machine.
[0008]
In contrast, in a so-called single-stage injection stretch blow molding machine that performs a series of processes from preform injection molding to stretch blow molding, various operation units such as an injection molding section, a heating section, a temperature control section, and a stretch blow molding section. However, the air conditioning efficiency is relatively low.
[0009]
An object of the present invention is to provide an air conditioner of an injection stretch blow molding machine that can improve the air conditioning efficiency of an injection molding station and prevent condensation of an injection mold.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, an air conditioner of an injection stretch blow molding machine of the present invention includes an injection molding station for injecting molten synthetic resin into a cooled mold and molding a preform,
A blow molding station that heats the injection-molded preform to an appropriate temperature for blow molding and performs stretch blow molding;
An air conditioner of an injection stretch blow molding machine having a molding work space in which the injection molding station and the blow molding station are continuous,
Isolating means for separating the molding work space atmosphere of the injection molding station and the blow molding station;
And dehumidifying means for performing dehumidification in the isolated injection molding station.
[0011]
According to the present invention, the dehumidifying means dehumidifies the isolated injection molding station by separating the molding work space atmosphere between the injection molding station that requires condensation prevention and the blow molding station that does not require condensation prevention. By doing so, the influence of the heat on the blow molding station side can be reduced, the dehumidification inside the injection molding station can be performed efficiently, the condensation on the mold on the injection molding station side can be prevented, and the moldability can be improved. be able to.
[0012]
In addition, the simple configuration of the separating means and the dehumidifying means can prevent dew condensation on the injection mold and can reduce the cost.
[0013]
In particular, since the dehumidification in a limited narrow space called an injection molding station is sufficient, the dehumidifying means may be small and the cost can be reduced.
[0014]
In the present invention, the dehumidifying means sucks and dehumidifies the air in the molding work space of the injection molding station, and circulates and supplies the dehumidified dry air to the molding work space of the injection molding station. It is preferable.
[0015]
In this way, the air in the molding work space of the injection molding station is sucked and dehumidified by the dehumidifying means, and the dry air after the dehumidification is further circulated and supplied, so that the dry air is always supplied and the dehumidification efficiency is improved. be able to.
[0016]
Furthermore, in this invention, it is preferable to have a forced exhaust means which discharges the heated air heated by the heating part for heating the preform provided in the blow molding station.
[0017]
In this way, by forcibly exhausting the heated air from the heating unit by the forced exhaust means, it is possible to prevent the injection molding station side from being affected by the heated air as much as possible, and further to the injection molding station side. It is possible to reliably prevent dew condensation on the injection mold.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0019]
1 and 2 are diagrams showing an injection stretch blow molding machine using an air conditioner according to an embodiment of the present invention.
[0020]
FIG. 2 is a schematic plan view of the injection stretch blow molding machine, and FIG. 1 is a side view of the injection stretch blow molding machine showing the safety cover of FIG. 2 in cross section.
[0021]
The injection stretch blow molding machine 10 is roughly divided into an injection molding station 14, a blow molding station 16, and a transfer station 18 located between the injection molding station 14 and the blow molding station 16 on a machine base 12. Is provided.
[0022]
As shown in FIG. 1, the injection molding station 14 has injection core molds 28 at two positions 180 degrees apart from each other, and rotates by intermittently circulating and transporting the injection core molds 28 along the rotary transport path. A board 20 is provided.
[0023]
Each stop position of the injection core mold 28 is provided with an injection molding part 24 at a position facing the injection device 22, and an extraction part 26 is provided facing the injection molding part 24.
[0024]
As shown in FIG. 1, the injection molding unit 24 has an injection cavity mold 34 that is driven to be clamped relatively to the injection core mold 28, and, for example, simultaneously performs a plurality of preforms by injection molding.
[0025]
In this injection molding, the temperature of the injection mold such as the injection cavity mold 34 and the injection core mold 28 is cooled to about 10 to 20 ° C., and the synthetic resin such as PET melted from the injection apparatus 22 is put into the injection cavity mold 34. The preform is molded by injection.
[0026]
On the other hand, the take-out unit 26 can take out the preform from the injection core mold 28 by driving the injection core mold 28 apart from the preform.
[0027]
In the present embodiment, the neck portion of the preform is formed by a neck cavity mold (not shown), and the preform is held by the neck cavity mold and the injection core mold and is taken out by the turntable 20. 26 is conveyed.
[0028]
And in the extraction part 26, after partial mold release of the injection core type | mold 28, a preform is extracted by releasing a preform from a neck cavity type | mold.
[0029]
As shown in FIG. 2, the blow molding station 16 is provided with a substantially rectangular conveyance path 30, which is not shown in the figure, but includes four conveyance sprockets and conveyance carried over them. And a conveying means for circulating conveyance composed of a conveying cylinder, a rack, a pinion and the like for driving the conveying chain and the conveying sprocket.
[0030]
As shown in FIG. 1, a plurality of conveying members 32 are fixed to the conveying chain at a predetermined distance, and a preform or a container is supported by each conveying member 32.
[0031]
As shown in FIG. 2, the conveyance path of the conveyance member 32 includes a receiving unit 40 that receives the preform from the transfer station 18, and a heating unit 42 that heats the preform received by the receiving unit 40 to a temperature appropriate for blow molding. There are provided a blow molding section 44 for drawing a preform heated by the heating section 42 to obtain a container, and a container take-out section 46 for taking out the container blow-molded by the blow molding section 44 from the machine.
[0032]
The heating unit 42 is provided with a heating device 50, and the heating device 50 is arranged, for example, by arranging a plurality of infrared heaters extending along the conveyance path in the height direction of the preform. When passing through, the rotation sprocket provided on the conveying member 32 meshes with the rotation chain to rotate the preform evenly while rotating the preform.
[0033]
As shown in FIG. 1, the blow molding section 44 has a blow cavity mold 54 that is clamped to the preform by a blow mold clamping mechanism 52, and blow-molds the preform into a container shape.
[0034]
As shown in FIG. 1, the container take-out unit 46 is configured to invert the container by the take-out device 56 and take it out in an upright state.
[0035]
The transfer station 18 delivers the preform taken out from the takeout part 26 of the injection molding station 14 to the receiving part 40 of the blow molding station 16.
[0036]
At the take-out unit 26 of the injection molding station 14, the number of preforms simultaneously molded by the injection molding unit 24 is taken out. At the transfer station 18, the number of simultaneous blow moldings is transferred to the receiving unit 40.
[0037]
The injection molding station 14 performs the injection molding in the upright state, whereas the transfer station 18 inverts the preform upside down and delivers the preform to the blow molding station 16 in an inverted state. Yes.
[0038]
The injection molding station 14, the blow molding station 16 and the transfer station 18 are covered with a safety cover 60 provided on the machine base 12, and the periphery and upper part thereof are covered. It is like that.
[0039]
The air conditioner 62 includes an isolation sheet 64 as isolation means, a dehumidification device 66 as dehumidification means, and a ventilation fan 68 as forced exhaust means.
[0040]
As shown in FIG. 1, the isolation sheet 64 is suspended and supported between the injection molding station 18 and the blow molding station 16 with a width corresponding to almost the entire width of the safety cover 60, and the injection molding station 14 and the blow molding station are supported. The 16 work space atmospheres are separated.
[0041]
In this way, by isolating the injection molding station 14 that needs to solve the problem of condensation and the blow molding station 16 that does not have the problem of condensation, it is possible to efficiently air-condition the molding work space atmosphere of the injection molding station 14. I have to.
[0042]
In particular, the presence of the isolation sheet 64 can prevent the heated air generated from the heating unit 42 of the blow molding station 16 from entering the injection molding station 14 side as much as possible, and can prevent the injection molding station 14 side from being affected by heat.
[0043]
Further, the isolation sheet 64 is formed of a transparent and flexible vinyl sheet, ensuring the visibility of each operation unit and facilitating maintenance, and does not interfere with the work during maintenance work.
[0044]
The isolation sheet 64 has a predetermined distance between the lower end of the isolation sheet 64 and the machine base 12 so as not to obstruct the transfer of the preform from the injection molding station to the blow molding station 16.
[0045]
The dehumidifying device 66 performs dehumidification in the isolated injection molding station 14 and is installed on the upper surface of the safety cover 60 at a position adjacent to the injection molding station 14.
[0046]
Further, the dehumidifying device 66 dehumidifies by sucking air in the molding work space of the injection molding station 14 from a suction duct 70 connected to the upper side of the injection molding station 14 and injecting it through the isolation sheet 60. Dry air dehumidified from a blowout duct 72 connected to the lower side of the molding station 14 is circulated and supplied into the molding work space of the injection molding station 14.
[0047]
In this way, by further circulating and supplying the dehumidified dry air, it is possible to always supply the dry air and improve the dehumidification efficiency.
[0048]
The ventilation fan 68 forcibly exhausts the heated air in the molding work space of the blow molding station 16 heated by the heating unit 42 to the outside of the machine, and is installed on the safety cover 60 above the heating device 50.
[0049]
Thus, by providing the ventilation fan 68 at a position above the heating device 50, the heated air heated by the heating device 50 can be directly discharged to the outside by the ventilation fan 68. Therefore, the influence of heat on the injection molding station 14 can be prevented.
[0050]
As described above, according to the present embodiment, the injection molding station 14 and the blow molding station 16 are isolated by the isolation sheet 64, and the dry air is circulated in the injection molding station 14 by the dehumidifying device 66. By dehumidifying the molding work space atmosphere in the injection molding station 14, condensation of the injection mold such as the injection cavity mold and the injection core mold can be prevented, and the moldability can be improved.
[0051]
In addition, the heated air in the blow molding station 16 is forcibly exhausted by the ventilation fan 68, so that it is possible to prevent condensation more reliably.
[0052]
The present invention is not limited to the above-described embodiment, and can be changed to various embodiments within the scope of the gist of the present invention.
[0053]
For example, in the above-described embodiment, the isolation sheet made of a flexible material is used as the isolation means. However, the present invention is not limited to this example, and a hard isolation member can also be used.
[0054]
Moreover, although the thing which circulates dry air was used as a dehumidifier, it is not necessary to circulate dry air.
[0055]
Further, although the ventilation fan is used as the forced exhaust means, it is also possible to use one that performs suction exhaust instead of the ventilation fan.
[0056]
In addition, as an injection stretch blow molding machine, a type in which a preform is conveyed by an injection core mold from an injection molding part to an extraction part has been described. However, as shown in Japanese Patent Application Laid-Open No. 10-76567, a preform is directly formed by an injection molding part. It can also be applied to a type that takes out and conveys and an injection stretch blow molding part that rotates and conveys a molded product from an injection molding part to a heating part, blow molding part, and take-out part as disclosed in Japanese Examined Patent Publication No. 53-2296. it can.
[0057]
At that time, it is only necessary to secure a transport work area so as not to interfere with the transport of the preform and to arrange the isolation sheet at a position where the injection molding station can be efficiently dehumidified.
[0058]
Furthermore, although the forced exhaust means is provided above the heating unit, if it is not positively exhausted, the safety cover above the blow molding station may be reticulated to improve ventilation.
[Brief description of the drawings]
FIG. 1 is a side view showing a cross section of a safety cover of the injection stretch blow molding machine of FIG. 2;
2 is a schematic plan view of the injection stretch blow molding machine of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Injection stretch blow molding apparatus 12 Machine stand 14 Injection molding station 16 Blow molding station 32 Conveying member 42 Heating part 44 Blow molding part 50 Heating apparatus 52 Preform positioning apparatus 60 Safety cover 62 Air conditioner 64 Isolation sheet 66 Dehumidification sheet 68 Ventilation fan

Claims (3)

An injection molding station for injecting molten synthetic resin into a cooled mold and molding a preform;
A blow molding station that heats the injection-molded preform to an appropriate temperature for blow molding and performs stretch blow molding;
An air conditioner of an injection stretch blow molding machine having a molding work space in which the injection molding station and the blow molding station are continuous,
Isolating means for separating the molding work space atmosphere of the injection molding station and the blow molding station;
An air conditioner for an injection stretch blow molding machine, comprising dehumidifying means for performing dehumidification in the isolated injection molding station. In claim 1,
An injection stretch blow molding machine wherein the dehumidifying means sucks and dehumidifies air in a molding work space of the injection molding station, and circulates and supplies dry air into the molding work space of the injection molding station. Air conditioner. In claim 1 or 2,
The blow molding station has a heating section for heating the preform,
An air conditioner for an injection stretch blow molding machine, comprising forced exhaust means for discharging heated air heated by the heating unit to the outside of the machine.

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