CN2371023Y - A crystallization device in the screw thread area of the bottle neck of a polyester container - Google Patents

Abstract

The utility model provides a crystallization device in polyester container bottleneck thread district, the tooth mouth portion inner edge of bottle base inlays admittedly on the fixed column, and tooth mouth portion is equipped with a radiation heat source outward, is equipped with a heat conductor on the fixed column, is equipped with the second radiation heat source in heat conductor corresponding position department, and the heat energy of radiation heat source conducts the fixed column through the heat conductor, evenly introduces on the smooth surface of bottle base bottleneck inner edge. It can eliminate cold spot, prevent heat deformation and facilitate stripping.

Description

A crystallization device in the screw thread area of the bottle neck of a polyester container

The utility model relates to a processing device for bottle mouth crystallization, in particular to processing equipment for crystallization of the screw tooth area of the bottle mouth of a polyester container.

The screw thread of the bottle mouth of the traditional polyester container is an amorphous (AMORPHOUS) polymer, so it is easy to deform under the impact of high temperature or high pressure, and there is a limit to the filling temperature of the liquid during hot filling operations. During processing, the liquid and air are easily polluted by bacteria. Therefore, crystallization treatment is applied to the mouth of the bottle to improve the characteristics of temperature resistance and pressure resistance, and it is currently used in hot filling products.

Crystallization treatment is the application of heat to induce crystallization of polyester polymers, and improve the physical and mechanical properties of the polymers by increasing the degree of crystallization. However, thermal deformation must be avoided during the crystallization process in order to control the bottle after crystallization. The size of the mouth is kept within a certain specification, therefore, the crystallization method and technology are the key to the quality of the finished product.

The current crystallization machinery and equipment include French SIDEL company, American ELECTRICA FORM and Japan’s Nissei, etc., which publicly produce bottle mouth crystallization machinery. The common point is a single external heating, and the size control structure can be divided into inner plug type and no inner plug type. crystallization.

With the structure of the inner plug (INSERT) crystallization device, it has higher dimensional stability, but it is not easy to break away from the inner plug (EJECTING). The bottom is almost viscoelastic and easily deformed;

The structure of the crystallization device without inner plug, because there is no inner plug, the size after crystallization is not easy to control, and it is not an ideal and skilled technology.

The aforementioned technology is shown in Figure 1. The main structure is that the inner edge of the mouth part 10 of the preform is embedded and fixed on the fixed column 11 of the crystallization equipment, and a radiation heat source 12 is arranged outside the mouth part 10. At this time, due to the mouth part 10 The thickness t1, t2, and t3 are all different, and affected by the shape of the tooth form a dead angle to receive the radiant heat source, resulting in many cold spots 14, as shown in Figure 2, resulting in irregular volumes of the polymer due to different relative densities during the crystallization process Shrinkage or expansion causes the bottle mouth to deform under the induction of thermal stress. In addition, from the crystallization curve C and temperature curve to, it can be seen that during the crystallization process of the optimal crystallization point A4 and the crystallization area A3, as shown in Figure 3, its cold point 14 The generation of thermal stress deforms the bottle mouth.

Based on this principle, when the structure is fully crystallized, a deformation amount W will be produced, as shown in Figure 4. In order to solve the shortcoming of the deformation amount W, there is no inner plug technology. It is impossible to standardize the radial size of the bottle mouth after crystallization and shrinkage, and there are disadvantages that the quality of the finished product is difficult to control and the size error is large. It is still not a good design.

The purpose of this utility model is to provide a crystallization device in the thread area of the bottle mouth of a polyester container, which can eliminate cold spots, prevent thermal deformation, and is easy to degerminate.

The purpose of this utility model is achieved in this way: a crystallization device for the screw teeth area of the bottle mouth of a polyester container. The inner edge of the mouth of the bottle embryo is embedded and fixed on the fixed column. The heat conductor is provided with a second radiant heat source at the corresponding position of the heat conductor, and the heat energy of the radiant heat source is conducted to the fixed column through the heat conductor, and evenly introduced into the smooth surface of the inner edge of the preform bottle mouth.

The fixed column is a thermal conductor that continuously maintains a certain temperature and slows down the shrinkage from the inside of the preform.

Because the utility model is equipped with a second heat conduction source, the heat source is guided by the fixed column onto the smooth surface of the inner edge of the bottle mouth of the preform, so that the heat is evenly dispersed on the bottle mouth to eliminate cold spots, and then the preform is controlled by different heat sources. Let the inside and outside of the bottle mouth present a state of being hard on the outside and soft on the inside, that is, after the outside of the bottle mouth is crystallized, the inside still maintains a certain temperature to slow down the radial pressure of shrinkage generated by the crystallization on the inside, so as to achieve the effect of easy degerming and no deformation. The smooth surface can conduct heat evenly, not only can eliminate the thermal stress caused by cold spots, but also has the ability to resist radial thermal stress caused by cold shrinkage.

The specific structure and working principle of the utility model will be described in detail below in conjunction with the accompanying drawings.

Fig. 1 is the schematic diagram of existing inner plug type structure;

Fig. 2 is a schematic diagram of a sectional view of a bottle mouth of a preform;

Fig. 3 is a schematic diagram of the bottle mouth crystallization curve;

Fig. 4 is a schematic diagram of bottle mouth deformation;

Fig. 5 is a schematic diagram of the crystallization of a preferred embodiment of the utility model;

Fig. 6 is a schematic diagram of the crystallization curve of a preferred embodiment of the utility model;

Fig. 7 is a schematic structural view of a preferred embodiment of the utility model;

Fig. 8 is a schematic diagram of crystallization equipment in a preferred embodiment of the present invention.

The improvement of the crystallization equipment in the screw tooth area of the bottle mouth of the container described in the utility model is mainly that the inner edge of the bottle mouth also has a heating function, that is, a uniform heat source is applied to the inside of the bottle mouth of the preform, so that the bottle body of the container can be heated during the molding process. Among them, there will be no cold spots on the screw teeth of the bottle mouth, thereby eliminating the disadvantage of thermal deformation, and at the same time making the bottle mouth of the preform hard on the outside and soft on the inside, easy to degerminate.

As shown in Figures 5 and 6, the utility model is mainly equipped with a second heat source, so that the mouth part 10 forms a solidification area A1 and a softening area A2 during the crystallization process, and the softening area A2 will gradually solidify after a long time such as the curve T , and the formation of the softening zone A2 is that there is a heat conductor 21 at one end of the fixed column 20, as shown in Figures 7 and 8, the heat conductor 21 is irradiated by the second heating radiation heat source 22, so that the fixed column 20 is opposite to the bottle of the preform 13. A softening zone A2 is formed inside the mouth, and this heat source conducts heat outward from the smooth inner edge of the bottle mouth, which can eliminate the cold spot 14 caused by the first radiant heat source 12 on the bottle mouth, thereby preventing the occurrence of irregular thermal strain and improving quality The purpose is to facilitate the detachment of the preform 13 from the fixed column and prevent the deformation of the embryo;

The detachment of the bottle embryo 13, after the bottle mouth is completely crystallized, the first radiant heat source 12 is no longer irradiated, so that the outside of the bottle mouth is solidified and cooled to crystallize, while the second radiant heat source 22 is still maintained by the heat conductor 21. A certain temperature is used to slow down the radial pressure on the fixed column 20 caused by the shrinkage of the bottle mouth after crystallization, thereby eliminating the radial shear force when the preform 13 is detached.

Claims (2)

1. polyester container bottleneck thread district crystallization apparatus, age of a draught animal portion's inner edge of bottle embryo is mounted on the fixed leg, be provided with a radiant heat source outside the age of a draught animal portion, it is characterized in that: fixed leg is provided with a heat conductor, be provided with second radiant heat source in the heat conductor corresponding position, the heat energy of radiant heat source is transmitted to fixed leg by heat conductor, evenly imports on the even surface of bottle embryo bottleneck inner edge.

2. a kind of polyester container bottleneck thread as claimed in claim 1 district crystallization apparatus is characterized in that: fixed leg is a lasting maintenance uniform temperature, slows down the heat carrier of its contraction by bottle embryo inboard.

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