PET preform heat treatment equipment with handle

Abstract

The present invention discloses a heat treatment device for a PET preform with a handle, comprising a cold air knife, a heating furnace and a conveying mechanism, wherein the cold air knife is arranged at the outlet side of the heating furnace, the preform is input into the heating furnace by the conveying mechanism for heating and then conveyed to the cold air knife, and the cold air knife blows air to cool the lower end of the handle of the preform. The heat treatment device for a PET preform with a handle of the present invention is provided with a cold air knife at the outlet side of the heating furnace, and the cold air knife blows air to cool the lower end of the handle of the preform, and the airflow appropriately reduces the temperature of the connection area between the lower end of the handle and the bottle body, realizing a smooth transition of the temperature of the bottle body and the handle, so that the handle is not easily deformed after the preform is blown, and the quality of the preform after blowing is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of bottle blowing machines, and in particular to a thermal treatment device for a PET bottle embryo with a handle. Background Art

[0002] At present, plastic milk bottles and beverage bottles with built-in handles on the market are mainly divided into two categories, one is HDPE bottles with built-in handles, and the other is PET bottles with rear handles. Among them, HDPE bottles with built-in handles have defects such as incomplete sealing, easy damage to the bottle body, and uncontrollable bottle capacity; while the other PET bottles have advantages such as good sealing, strong bottle body, high oxygen barrier performance, and transparency and easy observation compared to HDPE bottles, but currently PET bottles need to have rear handles, and the handles in PET milk bottles with rear handles require specific equipment to produce and install, and are easy to fall off after installation. The above reasons have prompted relevant companies in the industry to hope to replace the PET bottles with rear handles on the market with PET bottles with built-in handles.

[0003] In order to ensure that the position of the handle remains unchanged and the shape is intact, the blank material at the handle part of the bottle preform can only be stretched horizontally, not vertically. Therefore, it is necessary to perform technical treatment on the handle part during the heating process of the bottle preform to prevent deformation caused by the handle part becoming soft due to excessive temperature during the blowing process, thereby causing the blowing failure. After a large number of bottle blowing tests, it was found that if the wall thickness of each part of the bottle is comprehensively guaranteed to meet the physical performance requirements of the bottle, the low-temperature handle part and the high-temperature bottle body part after the bottle preform is heated should have a relatively gentle temperature transition zone, that is, it is necessary to appropriately increase the temperature of the joint between the handle and the bottle body and the lower end of the handle. The adverse consequence is that the lower end of the handle is stretched downward and deformed after the bottle preform is blown. The existing heating furnace uses infrared lamps to heat the bottle preform, which cannot solve the problem of making the above-mentioned temperature transition zone appear on the bottle preform while preventing the lower end of the handle from being heated to a higher temperature and causing deformation. Summary of the invention

[0004] The purpose of the present invention is to provide a heat treatment device for a PET preform with a handle, which cools the lower end of the handle of the preform separately by a cold air knife, so that the temperature at the junction of the bottle body and the lower end of the handle can be smoothly transitioned, thereby improving the product quality after the preform is blown.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Provided is a heat treatment device for a PET preform with a handle, comprising a cold air knife, a heating furnace and a conveying mechanism, wherein the cold air knife is arranged at the outlet side of the heating furnace, the preform is input into the heating furnace by the conveying mechanism for heating and then conveyed to the cold air knife, the preform comprises a bottle body and a handle arranged on the bottle body, and the cold air knife blows air to cool the lower end of the handle.

[0007] As a preferred solution of the present invention, the cold air knife is arranged on one side of the bottle body of the bottle embryo and is located below the handle. The cold air knife is provided with a first air outlet and a second air outlet. The distance between the first air outlet and the bottle body is smaller than the distance between the second air outlet and the bottle body. The airflow blown out of the second air outlet is toward the handle and vertically upward, and the airflow blown out of the first air outlet is toward the handle and biased toward one side of the second air outlet.

[0008] As a preferred embodiment of the present invention, the cold air knife includes a wind knife body, a first flow guide and a second flow guide, the first flow guide and the second flow guide are both detachably connected to the wind knife body, the wind knife body has a cavity inside, the first flow guide and the wind knife body are assembled to form the first air outlet, the second flow guide and the wind knife body are assembled to form the second air outlet, and the first air outlet and the second air outlet are both connected to the cavity.

[0009] As a preferred solution of the present invention, the first air guide member includes an extension portion, the extension portion is located on a side of the first air outlet close to the bottle body, the top of the extension portion is located above the first air outlet, and the side of the extension portion facing away from the bottle body forms an air guide surface, and the airflow blown out of the first air outlet impacts the air guide surface and is deflected by the air guide surface.

[0010] As a preferred solution of the present invention, the angle between the wind guide surface and the vertical direction is 0 to 15 degrees.

[0011] As a preferred solution of the present invention, the preform moves linearly without rotating when passing through the cold air knife, and the first air outlet and the second air outlet are both linear;

[0012] Alternatively, the preform moves in a curve when passing through the cold air knife, and the first air outlet and the second air outlet are in a curve shape.

[0013] As a preferred solution of the present invention, the cold air knife cools at least two of the bottle preforms simultaneously.

[0014] As a preferred solution of the present invention, the heat treatment equipment for PET preforms with handles further comprises an air knife seat, the cold air knife is connected to the air knife seat, a pressure equalizing chamber is provided inside the air knife seat, and the pressure equalizing chamber is communicated with the cavity.

[0015] As a preferred embodiment of the present invention, the temperature of the air flow blown out by the cold air knife is 3 to 10 degrees Celsius.

[0016] As a preferred embodiment of the present invention, the heating furnace includes a first heating zone and a second heating zone, the first heating zone heats the lower part of the bottle body of the bottle preform, the second heating zone heats the upper part of the bottle body of the bottle preform and the handle, and the temperature of the second heating zone is lower than the temperature of the first heating zone.

[0017] Beneficial effects of the present invention:

[0018] The heat treatment equipment for PET preforms with handles of the present invention is provided with a cold air knife at the outlet side of the heating furnace. The cold air knife blows air to cool the lower end of the handle of the preform. The airflow appropriately reduces the temperature of the connection area between the lower end of the handle and the bottle body, thereby achieving a smooth transition of the temperature of the bottle body and the handle. This makes it difficult for the handle to deform after the preform is blown, thereby effectively improving the quality of the preform after blowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of a heat treatment device for a PET preform with a handle according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the positional relationship between the cold air knife, the air knife seat and the preform in an embodiment of the present invention;

[0021] Figure 3 is a cross-sectional view of a cold air knife according to an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the structure of a heating furnace according to an embodiment of the present invention.

[0023] In the figure:

[0024] 1. Cold air knife; 10. Air knife body; 130. Cavity; 11. First air guide; 110. First air outlet; 111. Extension; 1111. Air guide surface; 12. Second air guide; 120. Second air outlet; 2. Heating furnace; 20. Infrared lamp; 210. First heating zone; 220. Second heating zone; 230. Air inlet mechanism; 240. Air outlet mechanism; 3. Conveying mechanism; 4. Air knife seat; 40. Pressure equalization chamber; 100. Bottle embryo; 101. Bottle body; 102. Handle. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0028] like Figure 1 and Figure 2 As shown, the heat treatment equipment for a PET preform with a handle in this embodiment includes a cold air knife 1, a heating furnace 2 and a conveying mechanism 3. The cold air knife 1 is arranged at the outlet side of the heating furnace 2. The preform 100 is input into the heating furnace 2 by the conveying mechanism 3 for heating and then conveyed to the cold air knife 1. The preform 100 includes a bottle body 101 and a handle 102 connected to the bottle body 101. The cold air knife 1 blows air to cool the lower end of the handle 102.

[0029] The heat treatment equipment for PET preforms with handles of this embodiment is provided with a cold air knife 1 at the outlet side of the heating furnace 2. The cold air knife 1 blows air to cool the lower end of the handle 102 of the preform 100. The airflow appropriately reduces the temperature of the connection area between the lower end of the handle 102 and the bottle body 101, thereby achieving a smooth transition of the temperature between the bottle body 101 and the handle 102, so that the handle 102 is not easily deformed after the preform 100 is blown, thereby effectively improving the quality of the preform 100 after blowing.

[0030] like Figure 2 and Figure 3As shown, preferably, the cold air knife 1 is arranged on one side of the bottle body 101 of the preform 100 and is located below the handle 102. The cold air knife 1 is provided with a first air outlet 110 and a second air outlet 120. The distance between the first air outlet 110 and the bottle body 101 is smaller than the distance between the second air outlet 120 and the bottle body 101. The airflow blown out of the second air outlet 120 is directed toward the handle 102 and vertically upwards. The airflow blown out of the first air outlet 110 is directed toward the handle 102 and deviates to one side of the second air outlet 120. The setting of the double air outlets makes the cooling range of the cold air knife 1 larger. Since the first air outlet 110 is close to the bottle body 101, in order to prevent the airflow ejected from the first air outlet 110 from cooling the lower part of the bottle body 101 which should be kept at a higher temperature, it is necessary to deflect the airflow ejected from the first air outlet 110 to a certain extent in the direction away from the bottle body 101, that is, to deviate to one side of the second air outlet 120.

[0031] Further, the cold air knife 1 comprises an air knife body 10, a first air guide 11 and a second air guide 12, the first air guide 11 and the second air guide 12 are both detachably connected to the air knife body 10, the air knife body 10 has a cavity 130 inside, the first air guide 11 and the air knife body 10 are assembled to form a first air outlet 110, the second air guide 12 and the air knife body 10 are assembled to form a second air outlet 120, and the first air outlet 110 and the second air outlet 120 are both connected to the cavity 130. For bottle preforms 100 of different sizes or shapes, the sizes of the handles 102 are usually different, and the shapes of the first air outlet 110 and the second air outlet 120 can be changed by replacing the first air guide 11 and the second air guide 12 to match the shape of the specific bottle preform 100, thereby ensuring a good cooling effect.

[0032] like Figure 3 As shown, in a specific embodiment, the first air guide 11 includes an extension portion 111, the extension portion 111 is located on the side of the first air outlet 110 close to the bottle body 101, the top of the extension portion 111 is located above the first air outlet 110, and the side of the extension portion 111 away from the bottle body 101 forms an air guide surface 1111, and the airflow blown out of the first air outlet 110 hits the air guide surface 1111 and is deflected by the air guide surface 1111. The air guide surface 1111 is a plane that forms a certain angle with the vertical direction, so it can limit the direction of the airflow and prevent the airflow from directly hitting the bottle body 101 and reducing the temperature of the bottle body 101.

[0033] Furthermore, the angle between the wind guide surface 1111 and the vertical direction is 0 to 15 degrees. The inclination angle of the wind guide surface 1111 cannot be too large, otherwise the airflow ejected from the first air outlet 110 cannot directly blow onto the handle 102, affecting the cooling effect of the cold air knife 1 on the handle 102.

[0034] Preferably, the first air outlet 110 and the second air outlet 120 are both in a straight line shape, and the preform 100 moves in a straight line without rotating when passing through the cold air knife 1. The first air outlet 110 and the second air outlet 120 are both in a narrow and long straight line shape, and the processing difficulty of the cold air knife 1 is relatively low. The width consistency of the first air outlet 110 and the second air outlet 120 can also be well guaranteed, so that the air flow velocity and flow rate of the airflow ejected from the first air outlet 110 and the second air outlet 120 are also consistent, so as to facilitate more accurate control of the cooling capacity of the cold air knife 1. In order to match the shape of the first air outlet 110 and the second air outlet 120, the conveying mechanism 3 needs to make the preform 100 keep moving in a straight line without rotating when passing through the cold air knife 1, so that the cooling airflow always blows toward the handle 102.

[0035] In other embodiments, in order to save conveying space, the preform 100 moves in a curve when passing through the cold air knife 1, and its trajectory includes a circular arc, so the first air outlet 110 and the second air outlet 120 are also curved, so that the cooling airflow always blows toward the handle 102.

[0036] Furthermore, the cold air knife 1 cools at least two preforms 100 at the same time. If the size of the cold air knife 1 is small, the cooling time of a single preform 100 is very short. In order to ensure the cooling effect, the conveying speed of the preform 100 needs to be low, which is not conducive to improving production efficiency. By appropriately increasing the size of the cold air knife 1, a single preform 100 can be cooled by the cooling airflow for a longer time even if the conveying speed is fast, which is conducive to improving production efficiency.

[0037] like Figure 2 As shown, in a specific embodiment, the heat treatment equipment for PET bottle embryos with handles also includes a wind knife seat 4, the cold air knife 1 is connected to the wind knife seat 4, a pressure equalizing chamber 40 is opened inside the wind knife seat 4, and the pressure equalizing chamber 40 is connected to the cavity 130. The cooling gas first passes into the pressure equalizing chamber 40 of the wind knife seat 4 and then flows into the cavity 130, and finally is ejected from the first air outlet 110 and the second air outlet 120, thereby ensuring the pressure stability of the cooling airflow ejected by the cold air knife 1, improving the consistency of the cooling effect of the cold air knife 1, and preventing the cooling effect from fluctuating greatly over time.

[0038] Preferably, the temperature of the air flow blown by the cold air knife 1 is 3 to 10 degrees Celsius. This temperature range can achieve a good cooling effect without causing adverse effects on the preform 100 due to too low a temperature.

[0039] like Figure 4As shown, preferably, the heating furnace 2 includes a first heating zone 210 and a second heating zone 220, the first heating zone 210 heats the lower part of the bottle body 101 of the preform 100, the second heating zone 220 heats the upper part of the bottle body 101 and the handle 102 of the preform 100, and the temperature of the second heating zone 220 is lower than that of the first heating zone 210. The heating furnace 2 heats the preform 100 through a plurality of infrared lamps 20, and adjusts the temperatures of the first heating zone 210 and the second heating zone 220 through an air inlet mechanism 230 and an air outlet mechanism 240, so that each part of the preform 100 reaches the target temperature and then outputs it to the cold air knife 1 for local cooling.

[0040] The air entering from the air inlet mechanism 230 flows into the first heating zone 210 and needs to pass through the second heating zone 220 and then be discharged by the air outlet mechanism 240. Therefore, the hot air in the second heating zone 220 cannot flow into the first heating zone 210, and the first heating zone 210 will not be heated by the airflow in the second heating zone 220.

[0041] As a preferred embodiment of the present invention, in the description of this specification, the description with reference to the term "preferred" or the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The above embodiments are only used to illustrate the detailed scheme of the present invention, and the present invention is not limited to the above detailed scheme, that is, it does not mean that the present invention must rely on the above detailed scheme to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A heat treatment equipment for PET preforms with handles, characterized in that: It includes a cold air knife, a heating furnace and a conveying mechanism, wherein the cold air knife is arranged at the outlet side of the heating furnace, the preform is input into the heating furnace by the conveying mechanism for heating and then conveyed to the cold air knife, the preform includes a bottle body and a handle arranged on the bottle body, and the cold air knife blows air to cool the lower end of the handle; The cold air knife is arranged on one side of the bottle body of the preform and below the handle, and a first air outlet and a second air outlet are provided on the cold air knife, the distance between the first air outlet and the bottle body is smaller than the distance between the second air outlet and the bottle body, the airflow blown out of the second air outlet is directed toward the handle and vertically upward, and the airflow blown out of the first air outlet is directed toward the handle and deviates toward one side of the second air outlet; The temperature of the air flow blown out by the cold air knife is 3 to 10 degrees Celsius.

2. The heat treatment equipment for PET preforms with handles according to claim 1 is characterized in that: The cold air knife includes a wind knife body, a first flow guide and a second flow guide. The first flow guide and the second flow guide are both detachably connected to the wind knife body. The wind knife body has a cavity inside. The first flow guide is assembled with the wind knife body to form the first air outlet. The second flow guide is assembled with the wind knife body to form the second air outlet. The first air outlet and the second air outlet are both connected to the cavity.

3. The heat treatment equipment for PET preforms with handles according to claim 2, characterized in that: The first air guide member includes an extension portion, which is located on a side of the first air outlet close to the bottle body, and the top of the extension portion is located above the first air outlet. The side of the extension portion facing away from the bottle body forms an air guide surface, and the airflow blown out of the first air outlet impacts the air guide surface and is deflected by the air guide surface.

4. The heat treatment equipment for PET preforms with handles according to claim 3 is characterized in that: The angle between the wind guide surface and the vertical direction is 0 to 15 degrees.

5. The heat treatment equipment for PET preforms with handles according to claim 1, characterized in that: When the preform passes through the cold air knife, it moves in a straight line without rotating, and the first air outlet and the second air outlet are both in a straight line; Alternatively, the preform moves in a curve when passing through the cold air knife, and the first air outlet and the second air outlet are in a curve shape.

6. The heat treatment equipment for PET preforms with handles according to claim 5, characterized in that: The cold air knife cools at least two of the bottle embryos simultaneously.

7. The heat treatment equipment for PET preforms with handles according to claim 2, characterized in that: It also includes a wind knife seat, the cold wind knife is connected to the wind knife seat, a pressure equalizing cavity is opened inside the wind knife seat, and the pressure equalizing cavity is communicated with the cavity.

8. The heat treatment equipment for PET preforms with handles according to claim 1, characterized in that: The heating furnace includes a first heating zone and a second heating zone, the first heating zone heats the lower part of the bottle body of the bottle embryo, the second heating zone heats the upper part of the bottle body of the bottle embryo and the handle, and the temperature of the second heating zone is lower than the temperature of the first heating zone.

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