JPH072021U - Mouth plug crystallization device - Google Patents

Abstract

(57) [Summary] [Structure] An infrared heater 4 is arranged along the carrying direction of a preform carrying mechanism 3 having a mandrel 2 for inserting and rotating the preform 1, and a spout 11 and a crystal to be crystallized. A device for crystallizing a plug part, characterized in that a shading plate 5 surrounding the preform 1 is attached at a position corresponding to a boundary 13 with a part 12 that should not be crystallized. The part that should not be crystallized is clearly separated, and the part that should not be crystallized does not become cloudy even if the room temperature or the like changes slightly, and the range of molding conditions is broadened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a crystallization device for a mouth part of a polyester bottle.

[0002]

[Prior art]

 Conventionally, in order to crystallize the plug part of a polyester bottle, an infrared heater 4 is arranged along the carrying direction of a preform carrying mechanism 3 having a rotatable mandrel 2 as shown in a plan view of FIG. The infrared heater 4 heats the mouth plug to crystallize it, but until now, the part to be crystallized and the part not to be crystallized were separated along the infrared heater 4 at the boundary. The eaves-shaped light-shielding plate 6 was attached to the corresponding height to shield the infrared rays and prevent the portions that should not be crystallized from being heated.

[0003]

[Problems to be solved by the device]

 However, when the mandrel with the preform moves continuously or discontinuously, infrared rays from the traveling direction, which cannot be well blocked by the eaves-shaped light-shielding plate 6 as described above, cause a portion of the preform to be closer to the body than the plug portion. There is a problem in that a portion which should not be crystallized is easily heated to be crystallized and becomes cloudy due to an increase in room temperature. The present invention solves this problem and does not provide a device for crystallizing a plug portion that can clearly separate a portion to be crystallized and a portion not to be crystallized.

[0004]

[Means for solving the problem]

 The present invention has an infrared heater arranged along the transport direction of a preform transport mechanism equipped with a mandrel for inserting and rotating a preform, and is placed at the position of a boundary between a plug portion to be crystallized and a portion not to be crystallized. The mouthpiece crystallization apparatus is characterized in that a light shielding plate surrounding the preform is attached.

Hereinafter, the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front sectional view of a main portion showing an example of the mouthpiece crystallization device of the present invention, FIG. 2 is a front sectional view of a main portion showing another example of the mouthpiece crystallization device of the present invention, and FIG. FIG. 4 is a plan view showing an example of a conventional device for crystallizing a spout part.

In the present invention, as shown in FIGS. 1 and 2, an infrared heater 4 is arranged along the carrying direction of a preform carrying mechanism 3 having a mandrel 2 for inserting and rotating the preform 1 for crystallization. The device for crystallizing a plug part is characterized in that a shading plate 5 surrounding the preform 1 is attached at a position corresponding to a boundary 13 between the plug part 11 to be crystallized and the part 12 not to be crystallized.

The preform 1 is made of a polyester resin such as polyethylene terephthalate, and has the property of crystallizing when heated above the crystallization temperature. Since the plug portion 11 is not oriented, crystal grains are likely to grow large, so that the plug portion 11 is whitened by sufficient crystallization.

Similar to the conventional mouthpiece crystallization device shown in FIG. 3, the mouthpiece crystallization device of the present invention has an infrared heater 4 along the conveying direction of a preform conveying mechanism 3 having a rotatable mandrel 2. It has a basic arrangement with.

The feature of the present invention resides in the arrangement of the light shielding plate 5. That is, in the example shown in FIG. 1, a hole 51 is formed in the center so as to surround the preform 1 at a position corresponding to the boundary 13 between the plugging portion 11 to be crystallized and the non-crystallizing portion 12 of the preform 1. Since a thin disk-shaped light shielding plate 5 is attached and the light shielding plate 5 surrounds the entire preform 1, there is no leakage of infrared rays and there is no heating to the part that should not be crystallized.

In the example of FIG. 2, the light shielding plate 5 is provided with a cylindrical portion 52 extending to the body portion side of the preform 1, and the cylindrical portion 52 can also completely shield infrared rays.

As shown in FIGS. 1 and 2, the light shield plate 5 is attached to the base 21 of the rotatable mandrel 2 so as to rotate together with the preform. Therefore, the preform 1 does not have to be rubbed against the preform 1. Infrared rays can be shielded in the immediate vicinity of, and can be accurately and clearly separated from the boundary 13.

In the example of FIG. 1 and FIG. 2, the pillar portion 22 extending from the base 21 and supporting the light shielding plate 5 has an upper half so that the infrared rays cannot be shaded against the preform 1 and a portion which is not crystallized is generated. The diameter of the portion was 3 mm or less, and the number was 4 or less, preferably 3.

[0013]

[Effect of device]

 According to the present invention, an infrared heater is arranged along the conveying direction of a preform conveying mechanism equipped with a mandrel for inserting and rotating a preform, and the infrared heater is arranged at the boundary position between the plug portion to be crystallized and the non-crystallizing portion. Since it is a device for crystallizing the plug part that is equipped with a light-shielding plate surrounding the reform, the part of the plug part that should be crystallized and the part that should not be crystallized are clearly separated, and the room temperature may be slightly different. The part that should not be crystallized even if changed did not become cloudy, and the range of molding conditions expanded.

[Brief description of drawings]

FIG. 1 is a front sectional view of a main part showing an example of a device for crystallizing a spout part of the present invention.

FIG. 2 is a front sectional view of a main part showing another example of the device for crystallizing a spout part of the present invention.

FIG. 3 is a plan view showing an example of a conventional mouthpiece crystallization apparatus.

[Explanation of symbols]

 1 Preform 11 Plug part 12 Part which should not be crystallized 13 Boundary 2 Mandrel 3 Preform transport mechanism 4 Infrared heater 5 Light shield plate

Claims (1)

[Scope of utility model registration request] 1. A position of a boundary between a plug portion to be crystallized and a portion not to be crystallized by arranging an infrared heater along a conveying direction of a preform conveying mechanism having a mandrel for inserting and rotating the preform. A mouthpiece crystallization device characterized in that a light shielding plate surrounding the preform is attached to the.