JPH11188785A - Heating apparatus for preform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily regulate a temperature of a preform by mounting a simple unit in a conventional preform heating apparatus without large alteration. SOLUTION: The heating apparatus for a preform comprises a heating case 18 having a plurality of arranged infrared heaters 24a to 24d at an interval in an axial direction of the preform 12 oppositely to a conveying route 14 of the preform 12, and heats the preform 12 intermittently conveyed on the route 14 and stopped at a front position of the heaters 24a to 24d of the case 18 while rotating the preform 12 around its own axis. In this case, the apparatus comprises a cooling air diffusing means 22 having a cooling air diffusing nozzle 42 disposed at a position opposed to the stopping position of the preform 12 of an opposite side to the heaters 24a to 24d via the preform 12 to diffuse a cooling air from a cooling air outlet 46 toward the preform 12. In this case, the means 22 has a diffusing amount regulating means 44 for regulating a diffusing amount of the air from the outlet 46, and the diffusing position of the outlet 36 is variable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preform heating apparatus used in a blow molding machine for heating an injection-molded or extruded preform and then blow-molding the preform. The present invention relates to a preform heating device for heating a preform.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 8-132517 previously proposed by the present applicant discloses a stretch blow molding apparatus having a preform heating apparatus.

In this preform heating apparatus, a heating box is arranged on a side of a preform conveyance path, and a reflector is arranged on the opposite side of the heating box across the preform conveyance path. .

[0004] In the heating box, a plurality of infrared heaters are arranged at intervals in the axial direction of the preform so as to face the transport path of the preform.

The plurality of infrared heaters can be arbitrarily set up, down, front and back so that a desired temperature distribution can be provided in the axial direction of the preform.

Then, the preform is intermittently conveyed along the conveyance path and stopped in the heating device, and the rotating preform is heated by the radiant heat of the infrared heater.

[0007] However, some of the containers to be molded are used for products, such as those having a specific portion decorated, engaging with an insert member such as a handle, or those requiring the strength of a specific portion. There are many demands, and some of such preform heating devices are not enough.

[0008] That is, in order to provide a temperature distribution in the axial direction of the preform, usually, the voltage or the amount of electric power of a plurality of infrared heaters is adjusted, and further, the interval between the infrared heater and the preform is adjusted. It is difficult to provide an extreme temperature distribution because the heater only gives the amount of heat and does not remove it.The purpose of the present invention is to provide a simple preform heating device without making a major change. An object of the present invention is to provide a preform heating device that can easily control the temperature of a preform by attaching the device.

[0009]

According to a first aspect of the present invention, there is provided a heating box having a plurality of infrared heaters arranged at intervals in an axial direction of a preform so as to face a conveying path of the preform. In a preform heating apparatus for heating while rotating the preform which is intermittently transported on the transport path and stopped at the infrared heater front position of the heating box, the preform is located on the opposite side of the infrared heater with respect to the preform. Cooling air blowing means provided with a cooling air blowing nozzle for blowing cooling air from the cooling air blowing port toward the preform at a position facing the stop position of the preform, wherein the cooling air blowing means comprises:
The cooling air outlet is provided with a blowing amount adjusting means for adjusting a blowing amount of the cooling air from the cooling air outlet, and a blowing position of the cooling air outlet is made variable.

According to the present invention, the temperature distribution is given to the preform in the axial direction by the plurality of infrared heaters, and the blowing position of the cooling air outlet of the cooling air blowing nozzle is set to an appropriate position by the cooling air blowing means. Set,
By blowing the cooling air adjusted by the blowing amount adjusting means to the preform, the preform is partially cooled, and a large change in temperature distribution according to the requirements of the container to be formed, which cannot be obtained by the infrared heater alone. Is obtained.

Particularly, in this preform heating device,
By simply adding the cooling air blowing means, the temperature of the preform can be easily adjusted with a simple structure without greatly changing the conventional preform heating device.

Further, since the amount of cooling air flowing out of the cooling air outlet can be adjusted by the blowing amount adjusting means, there is no problem that the cooling air is too cold to be blow molded.

According to a second aspect of the present invention, in the first aspect, the cooling air blowing nozzle is movable in an axial direction of the preform, and a blowing position of the cooling air blowing port is made variable. Features.

According to the present invention, in addition to the first aspect,
If the molded container does not meet the requirements such as wall thickness distribution, it is possible to easily change the position of the cooling air outlet by moving the cooling air outlet nozzle in the axial direction of the preform. It is possible to easily meet the requirements of the container to be molded.

According to a third aspect of the present invention, in the first or second aspect, a plurality of the cooling air blowing nozzles are provided.

According to the present invention, in addition to the first and second aspects, by changing the positions of the cooling air outlets of the plurality of cooling air outlet nozzles, it is possible to easily respond to the demand for more various containers. Can be.

According to a fourth aspect of the present invention, in the first aspect, a plurality of the heating boxes are provided along a conveying path of the preform, and the cooling air blowing means is provided corresponding to each of the heating boxes. Each of the cooling air blowing means has a blowing amount adjusting means.

According to the present invention, in addition to the third aspect,
Supply of cooling air from each cooling air blow-out nozzle provided in each of the plurality of heating boxes, and control of the amount of blow-off and blow-out amount by the blow-out amount adjusting means provided in each cooling air blow-out nozzle allow for more diverse containers. We can respond to requests.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the cooling air blowing nozzle has a plurality of cooling air blowing ports in an axial direction of the preform, and each cooling air blowing port has It can be selectively opened and closed.

According to the present invention, in addition to any one of the first to fourth aspects, the cooling air is blown to an arbitrary position in the axial direction of the preform by using the plurality of cooling air blowing ports of the cooling air blowing nozzle. Therefore, it is possible to easily cope with the demands of more various containers.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the reflecting plate for reflecting the light of the infrared heater is provided on the opposite side of the heating box across the conveyance path of the preform. The cooling air blowing nozzle is provided in parallel with a heater, and is provided on a perpendicular line of the infrared heater passing a stop position of the preform, and is provided between the reflection plate and the stop position of the preform. It is characterized by having.

According to the present invention, in addition to any one of the first to fifth aspects, the preform can be efficiently heated from both sides of the transport path in a short time by reflecting light by the reflector. At the same time, the cooling air blowing nozzle is arranged at a position where the influence of the light of the infrared heater is least, so that the cooling can be efficiently performed.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, air is supplied from behind the infrared heater to the direction of the preform conveying path by an air supply means for supplying air into the heating box. Can be supplied.

According to the present invention, in addition to any one of the first to sixth aspects, by supplying air from behind the infrared heater, it is possible to prevent the atmospheric heat in the heating box from excessively rising. In addition, overheating of the preform can be prevented.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a preform heating apparatus according to an embodiment of the present invention.

The preform heating device 10 is disposed in the middle of the transport path 14 of the preform 12, and the preform 12 held in an inverted state by the transport member 16 is shown in FIG. In a state where the preform 12 is intermittently conveyed in the conveyance direction A and stopped at the position of the heating device 10, the preform 12 is heated to an appropriate temperature for blow molding while being rotated by a rotation mechanism (not shown). For example, as shown in the plan view of FIG.
Are arranged along the transport path 14 of the preform 12.

Each heating device 10 includes a heating box 18,
It includes a reflection plate 20 and cooling air blowing means 22.

The heating box 18 is arranged on one side of the transport path 14 of the preform 12, and the surface on the transport path 14 side is open.

In the heating box 18, the preform 1
A plurality of, for example, five infrared heaters 24 spaced apart in the axial direction of the preform 12 so as to face the second transport path 14.
a, 24b, 24c, 24d and 24e are arranged, and these infrared heaters 24a, 24b, 24c, 24d and 24
The preform 12 is heated by the radiant heat e to impart a temperature distribution to the preform 12 in the axial direction.

In this case, since the preform 12 rotates on heating, it can be uniformly heated in the circumferential direction.

The infrared heaters 24a, 24a
b, 24c, 24d, and 24e, four infrared heaters 24a, 24b, 24c, and 24d
6 and the front and rear position adjusting means 28, the preform 12
The axial position and the front-back position with respect to the preform 12 can be arbitrarily adjusted according to the size of the container and the requirements of the container.

The axial direction adjusting means 26 includes the heating box 18
The infrared heaters 24 project from the upper part of the
a, 24b, 24c, 24d, respectively, two axial position adjusting rods 32a, 32 connected to two support blocks 30a, 30b, 30c, 30d, respectively.
b, 32c and 32d. Each of the infrared heaters 24a, 24b, 24c, and 24d is adjusted by sliding these axial position adjusting rods 32a, 32b, 32c, and 32d in the vertical direction and fixing them at arbitrary positions.
The position of d in the axial direction can be adjusted.

The front / rear position adjusting means 28 includes two front / rear position adjusting rods 34a, 34b, 34 each having a tip connected to the infrared heaters 24a, 24b, 24c, 24d.
c, 34d are the respective support blocks 30a, 30b, 30c,
It is slidably supported on 30d. Also,
Two front / rear position adjustment rods 34a, 34b, 3
Operation rods 36a, 36b, 36c, 36d for moving the front / rear position adjustment rods 34a, 34b, 34c, 34d are attached to a connecting member 35 connecting the base ends of 4c, 34d. And, the operation rods 36a, 36b,
By adjusting the nuts provided on 36c and 36d,
The front / rear position adjustment rods 34a, 34b, 34c, 34d slide with respect to the support blocks 30a, 30b, 30c, 30d, and the infrared heaters 24a, 24b, 24
The front and rear positions of c and 24d can be adjusted.

As described above, the axial position of the infrared heaters 24a, 24b, 24c and 24d is arbitrarily adjusted by the axial direction adjusting means 26 so that the infrared heaters 24a, 24b, 24c and 24d can be easily adjusted to the axial position according to the size of the preform 12 and the requirements of the container. Can be set, and
The infrared heaters 24a, 24a, 2
By arbitrarily adjusting the intervals between the preforms 12 and 4b, 24c and 24d, the infrared heaters 24a, 24b, 2
In addition to the adjustment of the voltage or electric energy of 4c and 24d, it is possible to provide a better temperature distribution.

A blower 38 is provided on the heating box 18 as air supply means. The blower 38 supplies air into the heating box 18 and
By supplying air from behind 4a, 24b, 24c, 24d, 24e toward the conveying path 14 of the preform 12, it is possible to prevent the ambient heat in the heating device 10 from excessively rising, and Twelve overheating is prevented.

The air from the blower 38 is supplied from below the heating box 18 to the neck of the preform 12 and to the conveying member 16 to prevent heating.

The reflection plate 20 is disposed on the opposite side of the heating box 18 with the conveyance path 14 of the preform 12 interposed therebetween.
The reflection plate 20 allows the infrared heaters 24a, 24b,
Light from 24c, 24d, and 24e is reflected, so that the preform 12 can be efficiently heated from both sides of the transport path 14 in a short time.

An infrared heater 40 is provided below the reflector 20 so as to face the infrared heater 24e, so that the preform 12 corresponding to the shoulder of the container can be sufficiently heated.

The cooling air blowing means 22 partially cools the preform 12 by blowing cooling air to an appropriate position of the preform 12, and has a cooling air blowing nozzle 42 and a blowing amount adjusting means 44. .

The cooling air blowing nozzle 42 has the infrared heaters 24a, 24b, 24c,
Reflector 20 and preform 1 on opposite sides of 24d and 24e
2 is located at a position facing the stop position of the preform 12.

The cooling air blowing nozzle 42 is
One cooling air outlet 4 for blowing cooling air toward the preform 12 at the tip is formed in an L-shape.
6 and a support member 4 above the reflector 20.
8, the preform 12 is supported so as to be movable in the axial direction, and the blowing position of the cooling air blowing port 46 is variable.

The blowout amount adjusting means 44 adjusts the blowout amount of the cooling air from the cooling air blowout port 46, and is connected to the air circuit 50 on the one hand and to the cooling air blowout nozzle 42 on the other hand.

As the blowing amount adjusting means 44, for example, a pressure reducing valve or a flow rate adjusting valve can be used.

As described above, by making the cooling air blowing nozzle 42 movable in the axial direction of the preform 12, for example, as shown in FIG. The cooling air blowing nozzle 4 is provided at a portion of the preform 12 corresponding to the engagement portion 58 with the handle 56.
By adjusting the position of the second cooling air outlet 46, the cooling air can be blown out and the portion corresponding to the engaging portion 58 can be cooled.

In this case, the cooling air blown out from the cooling air blowout port 46 of the cooling air blowout nozzle 42 directly hits the surface of the preform 12 and deprives the heat of that portion, so that the infrared heaters 24a, 24b, 24
A clear temperature distribution can be provided as compared with the case where only the voltage or the amount of electric power of c, 24d, 24e is adjusted, or the distance between the preform 12 and the electrode is simply adjusted.

At this time, since the preform 12 is rotating, heat can be uniformly removed in the circumferential direction.

Further, since the cooling air blowing nozzle 42 is located behind the preform 12 when viewed from the infrared heaters 24a, 24b, 24c, 24d, 24e, the radiant heat from the infrared heaters 24a, 24b, 24c, 24d, 24e is provided. And the heating of the preform 12 is not affected.

Further, the cooling air is supplied to the infrared heater 24.
a, 24b, 24c, 24d, 24e does not pass through the infrared heaters 24a, 24b, 24c, 24d, 24e like air from the blower 38 which is blown from behind, so it is not hot air. , Preform 12
The desired position can be reliably cooled.

Further, the supply of the cooling air is not always performed, but may be performed at least within the stop time of the preform 12, so that it is economical.

The supply and the stop of the cooling air may be appropriately performed by using a timer, or another driving system for supplying the air for the same time, for example, the preform 12 after heating by the heating device 10.
The blow air is blown out of the cooling air blow-out nozzle 42 simultaneously with the start of the air supply to the cylinder by simply connecting in parallel with the circuit on the air supply side of the extension unit of the blow molding device (not shown) of the blow molding device (not shown). Cooling air may be blown out from the port 46.

When the blow molding apparatus is connected, the blow molding time is the minimum stop time of the preform 12, so that the supply of the cooling air is continued until the blow molding is completed. Can be easily controlled.

As shown in FIG. 2, when a plurality of heating devices 10 are provided, a cooling air blowing means 22 is provided for each heating device 10, and a blowing amount adjusting means is provided for each cooling air blowing means 22. 44 are provided. By doing so,
Since the blowing amount can be changed in the first half and the second half of the heating, the adjustment range of the molding conditions can be further expanded.

FIG. 3 is a view showing a preform heating apparatus according to another embodiment of the present invention.

The preform heating device 60 includes a plurality of, for example, two fixed cooling air blowing nozzles 6.
2, 64 are arranged.

One of the cooling air outlet nozzles 62 has one cooling air outlet 66 having an L-shaped tip.

The other cooling air outlet nozzle 64 has a plurality of, for example, seven cooling air outlets 68 in the axial direction of the preform 12, and each of the cooling air outlets 68 can be selectively opened and closed. .

More specifically, the unused cooling air outlet 68 is closed by a stopper 70, and the used cooling air outlet 68 is opened by removing the stopper 70.

Further, these two cooling air blowing nozzles 62 and 64 are connected to one blowing amount adjusting means 44.

By adopting such a structure, for example, as shown in FIG. 5, when it is desired to increase the thickness of the shoulder portion 74 of the container 72 or the handle portion 76 near the bottom, the shoulder portion 74 of the preform 12 is required. A substantial portion can be cooled by the cooling air blowing nozzle 62, and a portion corresponding to the handle portion 76 can be cooled by the cooling air blowing nozzle 64.

The other constructions and operations are the same as those of the above-described embodiment, and the common parts are denoted by the same reference numerals, and the description is omitted.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

For example, in the embodiment shown in FIGS. 1 and 2,
Although one cooling air blowing nozzle is movable in the axial direction of the preform, the present invention is not limited to this example, and a plurality of cooling air blowing nozzles can be movable in the axial direction of the preform. .

In the embodiment of FIG. 3, a case is shown in which a cooling air blowing nozzle having one fixed cooling air blowing port and a cooling air blowing nozzle having a plurality of cooling air blowing ports are combined. , Not limited to this example,
The cooling air outlet nozzle having a plurality of cooling air outlets may be used alone, or both or one of the cooling air outlet nozzles may be movable in the axial direction of the preform.

Further, a plurality of cooling air outlet nozzles having one cooling air outlet may be provided and arranged in the axial direction of the preform.

When a plurality of cooling air blowing nozzles are used, each cooling air blowing nozzle may be provided with a blowing amount adjusting means to supply and stop the cooling air to each cooling air blowing nozzle. it can.

Further, when a plurality of cooling air outlets are selectively opened and closed, or when the cooling air outlet nozzle is moved in the axial direction, the operation is not limited to manual operation.
It can be done automatically.

[0068]

[Brief description of the drawings]

FIG. 1 is a front view showing a preform heating device according to an embodiment of the present invention.

FIG. 2 is a plan view of a preform heating device according to the embodiment of FIG. 1;

FIG. 3 is a front view showing a preform heating device according to another embodiment of the present invention.

FIG. 4 is a front view of a container with a handle formed by the preform heating device of FIGS. 1 and 2;

FIG. 5 is a front view of a container formed by the preform heating device of FIG. 3;

[Explanation of symbols]

 10, 60 Heating device 12 Preform 14 Transport path 18 Heating box 20 Reflector 22 Cooling air blowing means 24a to 24d Infrared heater 26 Axial position adjusting means 28 Front and rear position adjusting means 42, 62, 64 Cooling air blowing nozzle 44 Blowing amount Adjusting means 46, 66, 68 Cooling air outlet 70 Stopper

Claims (7)

[Claims] 1. A heating box having a plurality of infrared heaters arranged at intervals in an axial direction of a preform so as to face a conveyance path of a preform. The heating box is intermittently conveyed on the conveyance path. In a preform heating device for heating a preform stopped at a position in front of the infrared heater of the heating box while rotating, the preform is cooled to a position opposite to a stop position of the preform opposite to the infrared heater with the preform interposed therebetween. Cooling air blowing means for arranging a cooling air blowing nozzle for blowing cooling air toward the preform from the air blowing port, wherein the cooling air blowing means adjusts a cooling air blowing amount from the cooling air blowing port. And a blowing position of the cooling air outlet is made variable. Heating apparatus of that preform. 2. The preform according to claim 1, wherein the cooling air blowing nozzle is movable in an axial direction of the preform, and a blowing position of the cooling air blowing port is made variable. Heating equipment. 3. The preform heating device according to claim 1, wherein a plurality of the cooling air blowing nozzles are provided. 4. The heating box according to claim 1, wherein a plurality of the heating boxes are provided along a conveying path of the preform, and the cooling air blowing means is provided corresponding to each of the heating boxes. Preform heating devices, each having a blowout amount adjusting means. 5. The cooling air outlet nozzle according to claim 1, wherein the cooling air outlet nozzle has a plurality of cooling air outlets in an axial direction of the preform, and each cooling air outlet can be selectively opened and closed. A heating device for a preform, characterized in that: 6. The infrared heater according to claim 1, wherein a reflection plate for reflecting light of the infrared heater is provided on a side opposite to the heating box with the preform conveyance path interposed therebetween, in parallel with the infrared heater. The cooling air blowing nozzle is provided on a perpendicular line of the infrared heater passing through a stop position of the preform, and is provided between the reflection plate and the stop position of the preform. Preform heating device. 7. The preform according to claim 1, wherein air is supplied from behind the infrared heater toward a conveying path of the preform by an air supply unit that supplies air into the heating box. A heating device for a preform.