KR200333837Y1 - Heating structure for a neck part of PET-bottle - Google Patents

Abstract

The present invention relates to a heating structure of a neck of a PET bottle, and when heating the semi-finished product 10 of a certain standard through the first and second heaters 32 and 33 having a constant diameter, the distance "A to G" In the state of keeping it constant, while determining the overall infrared loss rate L at the corresponding position while changing the distance "H", it is determined systematically by taking the value which the minimum infrared loss rate L among these is the minimum. Since the heating structure, the neck bottle neck heating efficiency is optimized.

Description

Heating structure for a neck part of PET-bottle

The present invention relates to a heating structure of the neck of the PET bottle, and to a heating structure of the neck of the PET bottle so that the infrared ray loss rate is minimized.

As is well known, PET bottles used for various purposes are manufactured in various ways according to the purpose of use, and the neck part is crystallized (heat-resistant) and the neck part is not crystallized according to the heat treatment of the neck part of the PET bottle. It is classified as not. Here, when the neck of the PET bottle semi-finished product is heated to an appropriate temperature for a predetermined time and then cooled, the neck particles are crystallized to have a heat resistance function.

If the hot injection nozzle is in contact with or close to the neck in the process of injecting a storage material such as beverage or grain into the PET bottle, the neck is deformed and damaged by the hot injection nozzle. Crystallized ones should be used.

On the other hand, if the neck part is not heated above the proper temperature in the process of injecting a storage material such as beverage or grain into the PET bottle, there is no need to crystallize the neck part separately. Use a PET bottle.

In the structure for heating the neck of the PET bottle, as shown in Figure 1, the semi-finished body portion 11 is inserted into the semi-finished product input portion 21 of the holder 20, so that the semi-finished neck 12 Protruding to the upper portion of the holder 20, the reflective surface 31a, 31b of the semi-finished heating device 30 is arranged to face the side of the semi-finished neck portion 12, spaced at a predetermined interval, and are arranged on the same line vertically The pair of first and second heaters 32 and 33 form a structure provided inside the reflecting surfaces 31a and 31b. Here, the first and second heaters (32, 33), the heating wire (a) for converting electrical energy into thermal energy to emit infrared rays, the covering (b) of a transparent insulating material surrounding the heating wire (a) and forming a circle; And an infrared ray shielding heat resistant material (c) applied in a semicircular shape to the rear outer circumferential surface of the coating (b).

Therefore, in a state where the first and second heaters 32 and 33 are heated to a predetermined temperature, the holder 20 is rotated by a separate rotating device (not shown), so that a separate transfer device (not shown) is provided. When placed in the heating position as shown in FIG. 1, the semifinished product 10 is rotated with the holder 20, so that the semifinished neck portion 12 is directly irradiated with infrared rays from the first and second heaters 32 and 33. It is heated by indirect infrared rays reflected through the reflecting surfaces 31a and 31b.

On the other hand, a portion of the direct infrared rays from the first and second heaters 32 and 33 is lost between the upper end of the semi-finished input 21 of the holder 20 and the lower reflecting surface guide 31a when the semi-finished neck 12 is heated. Is lost to the outside through the upper part of the semi-finished neck 12 and between the upper reflecting surface guide 31a, and also indirectly from the first and second heaters 32 and 33 via the reflecting surfaces 31a and 31b. Part of the infrared light is lost between the upper end of the semifinished product inlet 21 of the holder 20 and the lower reflective surface guide 31a, or is lost to the outside through the upper part of the semi-finished neck 12 and between the upper reflective surface guide 31a. .

Therefore, in order to increase the heating efficiency of the semi-finished heating device 30, the loss of infrared rays as described above should be reduced, but conventionally, a systematic solution for this is not found, and the heating structure of the neck of the PET bottle depends on the accumulated empirical data. The situation is determined.

Such empirically accumulated data are not simply determined by a systematic method, but simply made out of old-fashioned data, and it is virtually impossible to optimize the heating efficiency of the semi-finished heating device 30 using them.

The present invention is devised to solve the above problems, the object of the present invention is to provide a heating structure of the neck of the PET bottle can minimize the infrared loss rate.

1 is a view showing the heating structure of the neck of the PET bottle,

2A and 2B are views for explaining a method of taking an infrared loss angle of the first heater,

3A and 3B are diagrams for describing a method of taking an infrared loss angle of the second heater.

Description of terms for the main parts of the accompanying drawings-

10; Semifinished product, 11; Body Part,

12; Neck, 20; holder,

21; Semi-finished product input, 30; Semifinished burner,

31; Main bodies 31a and 31b; Reflective Surface,

32; A first heater, 33; Second heater,

a; Heating wire, b; covering,

c; Infrared ray blocking material,

A; The height of the semifinished neck (12),

B; Vertical separation distance from semi-finished product inlet 21 to semi-finished neck 12,

C; Horizontal separation distance from the center of the holder 20 to the reflection surface guide portion 31a,

D; The horizontal length of the reflecting surface guide portion 31a,

E; The horizontal separation distance from the center P ₀ of the reflecting surface semicircular portion 31b to the center of the first and second heaters 32 and 33,

F1; Vertical separation distance from the upper reflecting surface guide 31a to the center of the first heater 32,

F2; Vertical separation distance from the center of the second heater 33 to the lower reflection surface guide 31a,

G; The vertical separation distance from the center of the first heater 32 to the center of the second heater 33.

H; Vertical separation distance from the semi-finished product inlet 21 to the center of the second heater 33,

P ₀ ; Center of reflective surface semi-circular portion 31b,

R; Radius of curvature of the reflective semi-circular portion 31b,

θ1; Direct upper loss angle from the first heater 32,

θ2; Direct lower loss angle from the first heater 32,

θ3; Lower loss angle from the first heater 32,

θ4; Indirect upper loss angle from the first heater 32 through the lower reflecting surfaces 31a and 32b,

θ5; Direct upper loss angle from the second heater 33,

θ6; Direct lower loss angle from the second heater 33,

θ7; Lower loss angle from the second heater 33,

θ8; Indirect upper loss angle from the second heater 33 through the upper reflecting surfaces 31a, 32b.

The present invention for achieving the above object, the semi-finished main body portion is inserted into the semi-finished product input portion of the holder, the semi-finished neck portion protrudes to the upper part of the holder and exposed, the reflecting surface of the semi-finished heating device to the side of the semi-finished neck It is arranged at a predetermined distance apart from each other, and is a heating wire that converts electrical energy into thermal energy and emits infrared rays, a transparent insulating material covering the heating wire, forming a circle, and an infrared blocking heat-resistant material applied in a semicircular shape on the rear outer surface of the coating. In a heating structure of a neck portion of a PET bottle in which a pair of first and second heaters are arranged on the same line vertically from the inside of the reflecting surface, the height of the semi-finished neck portion is 23 ± 1mm, and Diameter is 10 ± 1mm, vertical separation distance from semi-finished product inlet to semi-finished neck is 1.5 ± 0.5mm, horizontal separation from center of holder to reflecting guide The distance is 14.5 ± 0.5mm, the horizontal length of the reflecting surface guide part is 20.3 ± 0.5mm, and the horizontal separation distance from the center of the reflecting semi-circular part to the center of the first and second heaters is 10.5 ± 0.5mm, and the first heater The vertical separation distance from the center of the second heater to the center of the lower reflection surface guide is equal to 13 ± 0.5 mm, and the first heater and the second heater are perpendicular to each other. The vertical separation distance from the center of the first heater to the center of the second heater is 9-14 mm, and the vertical separation distance from the semi-finished product inlet to the center of the second heater is 10.5 ± 0.5 mm.

Hereinafter, referring to FIG. 1, a method of determining a heating structure according to the present invention is as follows.

First, as shown in FIG. 1, the semi-finished main body portion 11 is inserted into the semi-finished product inserting portion 21 of the holder 20, so that the semi-finished neck portion 12 protrudes upward from the holder 20, and is exposed. Reflecting surfaces 31a and 31b of the semi-finished heating device 30 are arranged to be spaced apart by a predetermined interval toward the side of the semi-finished neck portion 12, and a pair of first and second heaters 32 arranged vertically on the same line. 33 is installed inside the reflecting surfaces 31a and 31b, the vertical separation distance B from the semifinished product inlet 21 to the semifinished neck 12, and the reflecting surface guide from the center of the holder 20 The first and second heaters 32 and 33 from the horizontal separation distance C to the surface 31a, the horizontal length D of the reflective surface guide portion 31a, and the center P ₀ of the reflective surface semicircular portion 31b. The horizontal separation distance (E) to the center of) is maintained at a constant value, and the vertical separation distance (F1) from the upper reflecting surface guide (31a) to the center of the first heater (32) and the second electric field. The vertical separation distance F2 from the center of the machine 33 to the lower reflection surface guide 31a is kept constant at the same value so that the first heater 32 and the second heater 33 are vertically butted to each other. do.

Then, while varying the vertical separation distance (H) from the semi-finished product inlet 21 to the center of the second heater 33, to determine the overall infrared loss rate (L) at each corresponding position, the overall infrared loss rate ( The minimum value L) is taken as the vertical separation distance (H).

Here, the first and second heaters (32, 33), the heating wire (a) for converting electrical energy into thermal energy to emit infrared rays, the covering (b) of a transparent insulating material surrounding the heating wire (a) and forming a circle; And an infrared ray shielding heat resistant material (c) applied in a semicircular shape to the rear outer circumferential surface of the coating (b).

The PET bottle semi-finished product (P) has already been standardized worldwide, and in this embodiment, the height (A) of the semi-finished neck portion 12 was used as 23 ± 1 mm.

The vertical separation distance (B) from the semi-finished product inlet 21 to the semi-finished neck part 12 is a semi-finished neck part at the semi-finished product inlet 21 of the holder 20 when the semi-finished neck part 12 is heated or cooled. (12) is intended to prevent direct contact with heat conduction, and may be variously applied as necessary, but in the case of the present example, 1.5 ± 0.5 mm.

The horizontal separation distance C from the center of the holder 20 to the reflective surface guide portion 31a is advantageous for heating as the length thereof is shorter, and may be variously changed as necessary. However, in the present embodiment, the horizontal separation distance C is 14.5. It was set as ± 0.5 mm.

The reflecting surface guide portion 31a is arranged horizontally to guide the infrared rays from the first and second heaters 32 and 33 to the semi-finished neck portion 12, the horizontal length D of which varies as necessary. Although it can be changed, it was 20.3 ± 0.5 mm in this example.

Although the horizontal separation distance E from the center P ₀ of the reflective surface semi-circular portion 31b to the center of the first and second heaters 32 and 33 may be variously changed as necessary, in the present embodiment It was 10.5 ± 0.5 mm.

Vertical separation distance F1 from the upper reflection surface guide 31a to the center of the first heater 32 and vertical separation distance F2 from the center of the second heater 33 to the lower reflection surface guide 31a. ) Can be variously changed as necessary, but in the case of the present embodiment was set to 13 ± 0.5mm.

The vertical separation distance G from the center of the first heater 32 to the center of the second heater 33 may also be varied as needed, but the values of "A to F2" and the first · 2 While the diameters of the heaters 32 and 33 were fixed at a constant value, the total infrared loss rate L was compared while changing the separation distance G and the separation distance H. That is, the separation distance G was small. The overall infrared loss rate (L) was reduced. In other words, when the first heater 32 and the second heater 33 are perpendicular to each other, the overall infrared loss rate L is reduced. In the present embodiment, since the first and second heaters 32 and 33 having a diameter of 10 ± 1 mm are used, the tolerances of the first and second heaters 32 and 33 and the first and the first and second heaters 32 and 33 generated when installing them are provided. In view of the tolerance between the two heaters 32 and 33, the separation distance G was set to 9 to 14 mm.

Meanwhile, referring to FIGS. 2A to 3B, the method of taking the overall infrared loss rate L will be described.

As shown in FIGS. 2A to 3B, the infrared rays emitted directly from the first and second heaters 32 or reflected indirectly from the reflection surfaces 31a and 31b are emitted from the upper gap (semi-finished neck portion 12). And gaps between the upper and lower reflective surface guide portions 31a and lower gaps (gaps between the upper and lower reflective surface guide portions 31a of the semi-finished product inlet 21).

First, the infrared loss angle θ _X of the first heater 32 is the direct upper loss angle θ1 from the first heater 32 and the direct lower loss angle θ2 from the first heater 32. Indirect lower loss angles θ3-θ2 from the first heater 32 through the lower reflecting surfaces 31a and 32b, and indirect from the first heater 32 through the lower reflecting surfaces 31a and 32b. Upper loss angle θ4, indirect upper loss angle (not shown) from first heater 32 through upper reflecting surfaces 31a and 32b, first heater 32 through upper reflecting surfaces 31a and 32b. Indirect lower loss angles (not shown) from. However, as a result of performing a number of experiments, in the present embodiment, indirect infrared rays from the first heater 32 reflected by the upper reflecting surfaces 31a and 32b are considerably insufficient so that their loss can be neglected. I could see that. Thus, the infrared ray loss angle θ _{X of} the first heater 32 is taken in the same manner as in Equation 1 below, and the infrared ray loss rate L _X of the first heater 32 is shown in Equation 2 below. .

,

Here, if θ2> θ3, max (θ2, θ3) = θ2,

If θ2 <θ3, max (θ2, θ3) = θ3,

If θ2 = θ3 then max (θ2, θ3) = θ2 or θ3

The infrared loss angle θ _Y of the second heater 33 is a direct upper loss angle θ5 from the second heater 33, a direct lower loss angle θ6 from the second heater 33, Indirect lower loss angles θ7-θ6 from the second heater 33 through the lower reflecting surfaces 31a and 32b, and indirect upper portions from the second heater 33 through the lower reflecting surfaces 31a and 32b. Loss angle (not shown), indirect upper loss angle (not shown) from the second heater 33 through the upper reflecting surfaces 31a and 32b, and second heater 33 through the upper reflecting surfaces 31a and 32b. It is the sum of indirect lower loss angles θ8 from. However, as a result of performing a number of experiments, in the present embodiment, the indirect upper loss angle from the second heater 33 through the lower reflecting surfaces 31a and 32b, and through the upper reflecting surfaces 31a and 32b It can be seen that the indirect upper loss angle from the second heater 33 is considerably insignificant so that the value can be ignored. Thus, the infrared loss angle θ _Y of the second heater 33 is Taken in the same manner as in Equation 3, the infrared ray loss rate L _Y of the second heater 33 is expressed by Equation 4 below.

On the other hand, the overall IR loss (L) is so divided by 360, the combined infrared loss angle (θ _Y) of the IR loss angle (θ _X) and the second heater 33 of the first electric heater 32, the whole infrared loss (L) is shown in Equation 5 below.

In the present embodiment, as a result of calculating the overall infrared loss rate (L) as described above and comparing them, the vertical separation distance (H) from the semi-finished product inlet 21 to the center of the second heater 33 is approximately In the range of 10.5 ± 0.5 mm, the overall infrared loss rate (L) was minimal.

According to the present invention as described above, in heating the semi-finished product 10 of a certain standard through the first and second heaters 32 and 33 having a constant diameter, the distance "A to G" is kept constant. In one state, while changing the distance "H", grasping the overall infrared loss rate (L) at the corresponding position, the total infrared loss rate (L) is taken to be the minimum among them, so that the heating efficiency of the semi-finished neck The optimal heating structure for improvement can be systematically determined.

Therefore, when applying the PET bottle neck heating structure determined in this way, infrared loss is minimized, there is an effect that the PET bottle neck heating efficiency is increased.

Claims (1)

The semifinished product body portion 11 is inserted into the semifinished product inlet 21 of the holder 20 so that the semifinished product neck portion 12 protrudes from the upper part of the holder 20 to be exposed, and the reflective surface of the semifinished product heating apparatus 30 ( 31a and 31b are disposed to face the side of the semi-finished neck portion 12 and are spaced at a predetermined interval, and the heating wire (a) for converting electrical energy into thermal energy to emit infrared rays and the transparent insulation surrounding the heating wire (a) to form a circle The pair of first and second heaters 32 and 33 made of a coating material b and an infrared ray blocking heat-resistant material c applied in a semicircular shape to the outer circumferential surface of the rear surface of the coating material b, reflecting surfaces 31a, In the heating structure of the neck of the PET bottle arranged in the same line vertically from the inside of 31b), The height A of the semi-finished neck portion 12 is 23 ± 1 mm, the diameter of the first and second heaters 32, 33 is 10 ± 1 mm, the vertical from the semi-finished product inlet 21 to the semi-finished neck portion 12 The separation distance B is 1.5 ± 0.5mm, and the horizontal separation distance C from the center of the holder 20 to the reflection surface guide portion 31a is 14.5 ± 0.5mm, and the horizontal length of the reflection surface guide portion 31a ( D) is 20.3 ± 0.5mm, and the horizontal separation distance E from the center P ₀ of the reflecting semicircular portion 31b to the center of the first and second heaters 32 and 33 is 10.5 ± 0.5mm, The vertical separation distance F1 from the reflection surface guide 31a to the center of the first heater 32 and the vertical separation distance F2 from the center of the second heater 33 to the lower reflection surface guide 31a are From the center of the first heater 32 to the center of the second heater 33 in a state where the first heater 32 and the second heater 33 are vertically butted to each other at 13 ± 0.5 mm. Vertical separation distance G is 9 ~ 14mm, semi-finished product inlet 21 Vertical separation distance (H) from the center of the second heater (33) is 10.5 ± 0.5mm heating structure of the neck of the PET bottle.