A hot-air shrink tunnel for bowl-shaped food packages

Abstract

This utility model proposes a hot air shrink oven for bowl-shaped food packaging, comprising: a conveyor belt, a hot air oven body, a heat preservation cavity assembly, and a heat shrink cavity assembly. The hot air oven body has openings at both ends. Both the heat preservation cavity assembly and the heat shrink cavity assembly are installed within the hot air oven body. The conveyor belt is installed along the length of the hot air oven body and passes through the heat preservation cavity assembly and the heat shrink cavity assembly. After the heat shrink film of the bowl-shaped food packaging enters the hot air oven, it is first preheated to 80°C to 90°C in a second chamber. Then, as it passes through the first chamber, different air outlets (lower air outlet section, upper and lower air outlet section, and full air outlet section) cause the heat shrink film to shrink in an orderly manner, thus avoiding incomplete wrapping. Furthermore, after preheating, the temperature difference throughout the heat shrink film is small, allowing it to be quickly heated to the shrinkage temperature in the first chamber, preventing wrinkles after heating.

Description

Technical Field

[0001] This utility model relates to the field of food packaging technology, and in particular to a hot air shrink oven for bowl-shaped food packaging. Background Technology

[0002] Foods like turtle jelly often use plastic bowls for packaging. The bowls are sealed with plastic, and honey, condensed milk, and plastic spoons are placed inside the plastic lids. To prevent the lids from separating from the bowls, heat-shrink film is usually wrapped around the outside of the bowls. A hot air shrink oven shrinks the film, preventing dust from entering the lids and preventing separation during transport. The heat-shrink film is placed vertically on the bowls. Traditional hot air shrink ovens blow hot air from top to bottom, causing the upper part of the film to shrink first, pulling the lower part of the film upwards and resulting in incomplete wrapping. For example, Chinese patent application number 201310688561.0 discloses a label-wrapping shrink packaging system. To address the issue of asynchronous shrinkage of the sleeve film in sleeve-wrapped products, the sleeve-wrapped shrink packaging system includes a product conveyor belt; a sleeve labeling machine for applying sleeve labels to products; a sleeve labeling device; a bidirectional hot air pre-shrinking and positioning device for pre-shrinking and positioning the sleeve film, wherein the height of the hot air outlet is higher than the upper surface of the product conveyor belt; and a synchronous limiting device located behind the sleeve labeling device to restrict the upward movement of the sleeve film. This device adds bidirectional hot air pre-shrinking positioning devices on both sides of the conveyor belt, causing the lower part of the heat shrink film to shrink before entering the hot air shrink oven. While this method solves the problem of the heat shrink film shifting upwards, the lower part of the heat shrink film takes 10 to 15 seconds on the conveyor belt after being heated before entering the hot air oven. During this time, the lower part of the heat shrink film cools down, causing wrinkles to appear on the heat shrink film. Even after secondary heating in the hot air shrink oven, these wrinkles cannot be eliminated, affecting the appearance of the product. Therefore, a hot air shrink oven for bowl-shaped food packaging is needed, which preheats the heat shrink film before the actual heating. During the actual heating, the direction of the hot air is controlled to ensure that the heat shrink film is stably wrapped on the product packaging, and all parts of the heat shrink film are heated evenly, greatly reducing the wrinkling problem caused by uneven heating. Utility Model Content

[0003] To address the aforementioned issues, this invention proposes a hot air shrink oven for bowl-shaped food packaging. Before formal heating, the heat shrink film is preheated. During formal heating, the direction of the hot air is controlled to ensure that the heat shrink film is stably wrapped around the product packaging. The heat shrink film is heated evenly in all parts, greatly reducing the wrinkling problem caused by uneven heating.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model proposes a hot air shrink oven for bowl-shaped food packaging, comprising: a conveyor belt, a hot air oven body, an insulation cavity assembly, and a heat shrink cavity assembly. The hot air oven body has openings at both ends. The insulation cavity assembly and the heat shrink cavity assembly are both installed in the hot air oven body. The conveyor belt is installed in the hot air oven body along its length and passes through the insulation cavity assembly and the heat shrink cavity assembly. The heat shrink cavity assembly includes: a first trough, a first air supply hood, a first air collection hood, a first fan, and a first electric heater. The first trough has a first air intake hole at its upper part and first air outlet holes on both sides. The first air supply hood covers both sides of the first trough, and the first air collection hood covers the upper part of the first trough. The air inlet side of the first fan is connected to the first air collection hood through a pipe, and the air outlet side of the first fan is connected to the first air supply hood through the first electric heater.

[0006] Furthermore, the first trough is provided with a lower air outlet section, an upper and lower air outlet section, and a full air outlet section. The lower air outlet section has a first air outlet only at the bottom, the upper and lower air outlet sections have a first air outlet only at the top and bottom, and the full air outlet section has a first air outlet at the top, middle, and bottom.

[0007] Furthermore, the air outlet direction of the first air outlet is parallel to the horizontal plane.

[0008] Furthermore, the first air supply hoods on both sides of the first tank are connected by a first connecting pipe, and the first electric heater is connected to the first connecting pipe.

[0009] Furthermore, the first fan is connected to the first air supply hood via a first support frame.

[0010] Furthermore, the insulation cavity assembly includes: a second tank, a second air supply hood, a second air collection hood, a second fan, and a second electric heater. The upper part of the second tank is provided with a second air intake hole, and the two sides of the second tank are provided with second air outlet holes. The second air supply hood covers the two sides of the second tank, and the second air collection hood covers the upper part of the second tank. The air inlet side of the second fan is connected to the second air collection hood through a pipe, and the air outlet side of the second fan is connected to the second air supply hood through the second electric heater.

[0011] Furthermore, second air outlets are provided on the upper, middle and lower parts of both sides of the second tank.

[0012] The beneficial effects of this utility model are as follows: After the heat shrink film of the bowl-shaped food packaging enters the hot air furnace, it is first preheated to 80°C to 90°C in the second tank. Then, when it passes through the first tank, the heat shrink film shrinks in an orderly manner through the different air outlets set in the lower air outlet section, upper and lower air outlet sections, and full air outlet section, thereby avoiding incomplete wrapping. After preheating, the temperature difference in various parts of the heat shrink film is small, and it can be quickly heated to the shrinking temperature in the first tank, preventing wrinkles from appearing after the heat shrink film is heated. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the thermal insulation cavity assembly and the heat shrink cavity assembly of this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the first and second tanks of this utility model;

[0016] In the diagram: 1-Conveyor belt, 2-Hot air furnace body, 3-Insulation chamber assembly, 301-Second tank, 302-Second air supply hood, 303-Second air collection hood, 304-Second fan, 305-Second electric heater, 306-Second air outlet, 4-Heat shrink chamber assembly, 401-First tank, 402-First air supply hood, 403-First air collection hood, 404-First fan, 405-First electric heater, 406-First air outlet, 407-First connecting pipe, 408-First support frame. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0019] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of the stated features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0020] like Figure 1 , Figure 2 , Figure 3 As shown, an embodiment of this utility model provides a hot air shrink oven for bowl-shaped food packaging, including: a conveyor belt 1, a hot air oven body 2, a heat insulation cavity assembly 3, and a heat shrink cavity assembly 4. The hot air oven body 2 has openings at both ends. The heat insulation cavity assembly 3 and the heat shrink cavity assembly 4 are both installed in the hot air oven body 2. The conveyor belt 1 is installed in the hot air oven body 2 along its length and passes through the heat insulation cavity assembly 3 and the heat shrink cavity assembly 4. The heat shrink cavity assembly 4 includes: a first groove 401 and a first air supply... The system includes a cover 402, a first air collecting cover 403, a first fan 404, and a first electric heater 405. The upper part of the first tank 401 is provided with a first air intake hole, and the two sides of the first tank 401 are provided with first air outlet holes 406. The first air supply cover 402 covers the two sides of the first tank 401, and the first air collecting cover 403 covers the upper part of the first tank 401. The air inlet side of the first fan 404 is connected to the first air collecting cover 403 through a pipe, and the air outlet side of the first fan 404 is connected to the first air supply cover 402 through the first electric heater 405.

[0021] After processes such as film wrapping and leveling, bowl-shaped food packaging, such as herbal jelly, enters the hot air furnace body 2 via conveyor belt 1. The commonly used heat shrink film has a shrinkage temperature of 110℃ to 140℃. The heat shrink film then enters the heat preservation chamber assembly 3 via conveyor belt 1. Hot air blown from the second trough 301 preheats the heat shrink film to 80℃ to 90℃, preventing the bowl-shaped food packaging from softening. At this temperature, the heat shrink film remains stable and does not shrink. After preheating, the bowl-shaped food packaging film enters the first trough 401 via conveyor belt 1. Hot air at a temperature of 120℃ to 140℃ is blown from the first air outlet 406 of the first trough 401. In the lower air outlet section, only the bottommost part has a first air outlet... At air vent 406, the bottom part of the heat shrink film is first heated to the shrinkage temperature, wrapping the bottom of the plastic bowl to prevent the heat shrink film from moving upwards. After 2 to 4 seconds, the bowl-shaped food packaging moves to the upper and lower air outlet sections. The upper and lower air outlet sections only have the first air outlet 406 at the top and bottom. At this time, the upper part of the heat shrink film is also heated and shrinks to prevent the heat shrink film from moving downwards. Then the bowl-shaped food packaging film moves to the full air outlet section, where the heat shrink film is evenly heated by hot air, allowing the heat shrink film to fully shrink. After preheating, the temperature difference of the heat shrink film is small. When it encounters the hot air blown out from the first air outlet 406, it can quickly heat up to the shrinkage temperature, allowing the heat shrink film to shrink evenly and avoiding wrinkles caused by temperature differences.

[0022] The inner cavity of the hot air furnace body 2 is the same as that of a traditional hot air furnace. The heat insulation cavity assembly 3 and the heat shrink cavity assembly 4 are fixed in the inner cavity of the hot air furnace body 2 by a bracket. The heat insulation cavity assembly 3 and the heat shrink cavity assembly 4 are above the conveyor belt 1. The conveyor belt 1 can drive the plastic bowl through the heat insulation cavity assembly 3 and the heat shrink cavity assembly 4.

[0023] In a preferred embodiment, such as Figure 3 As shown, the first trough 401 is provided with a lower air outlet section, an upper and lower air outlet section, and a full air outlet section. The lower air outlet section has a first air outlet 406 only at the bottom. The upper and lower air outlet sections have first air outlets 406 only at the top and bottom. The full air outlet section has first air outlets 406 at the top, middle, and bottom.

[0024] In the first tank 401, the airflow position is controlled in an orderly manner by the lower air outlet section and the upper and lower air outlet sections, thus controlling the heating position of the heat shrink film. This causes the lower and upper parts of the heat shrink film to shrink first, wrapping the plastic bowl and preventing the heat shrink film from shifting. Then, the entire heat shrink film is heated by the full air outlet section, ensuring that the entire heat shrink film is heated and shrinks. The plastic bowl is made of high-temperature resistant plastic such as PP, and the heating time of the heat shrink film in the first tank 401 is about 10 seconds. The temperature rise of the plastic bowl is small, which can prevent the plastic bowl and plastic lid from deforming due to excessive temperature.

[0025] Preferably, the air outlet 406 is parallel to the horizontal plane, so that the hot air blown out by the first air outlet 406 can heat the lower and upper parts of the heat shrink film according to the settings. After the lower and upper parts of the heat shrink film shrink, they can wrap around the plastic bowl to prevent the heat shrink film from shifting during subsequent shrinkage.

[0026] In a preferred embodiment, the first air supply hoods 402 on both sides of the first tank 401 are connected by a first connecting pipe 407, and the first electric heater 405 is connected to the first connecting pipe 407. After the first electric heater 405 heats the air to a set temperature, it is diverted to the first air supply hoods 402 on both sides of the first tank 401 through the first connecting pipe 407, and then blown into the interior of the first tank 401 through the first air outlet 406 to heat the heat shrink film.

[0027] In a specific embodiment, such as Figure 2 As shown, the first fan 404 is connected to the first air supply hood 402 through the first support frame 408, so that the first fan 404 is fixed and prevented from shifting during operation.

[0028] Specifically, such as Figure 2 , Figure 3 As shown, the insulation cavity assembly 3 includes: a second trough 301, a second air supply hood 302, a second air collection hood 303, a second fan 304, and a second electric heater 305. The upper part of the second trough 301 is provided with a second air intake hole, and the two sides of the second trough 301 are provided with second air outlet holes 306. The second air supply hood 302 covers the two sides of the second trough 301, and the second air collection hood 303 covers the upper part of the second trough 301. The air inlet side of the second fan 304 is connected to the second air collection hood 303 through a pipe, and the air outlet side of the second fan 304 is connected to the second air supply hood 302 through the second electric heater 305.

[0029] In one specific embodiment, the upper, middle and lower parts of both sides of the second trough 301 are provided with second air outlets 306.

[0030] The structure and principle of the heat insulation cavity assembly 3 are similar to those of the heat shrink cavity assembly 4. The only difference is that the second air outlet 306 is uniformly arranged on the second tank 301. After the heat shrink film enters the second tank 301, it can be uniformly heated to the preheating temperature by the hot air blown out by the second air outlet 306.

[0031] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A hot air shrink oven for bowl-shaped food packaging, characterized in that, include: The hot air furnace consists of a conveyor belt (1), a hot air furnace body (2), an insulation cavity assembly (3), and a heat shrink cavity assembly (4). The hot air furnace body (2) has openings at both ends. The insulation cavity assembly (3) and the heat shrink cavity assembly (4) are both installed within the hot air furnace body (2). The conveyor belt (1) is installed along the length of the hot air furnace body (2) within it, passing through the insulation cavity assembly (3) and the heat shrink cavity assembly (4). The heat shrink cavity assembly (4) includes: a first trough (401), a first air supply hood (402), and a first air collecting hood (403). 403), a first fan (404), a first electric heater (405), a first air intake hole is provided on the upper part of the first tank (401), a first air outlet hole (406) is provided on both sides of the first tank (401), a first air supply hood (402) covers both sides of the first tank (401), a first air collecting hood (403) covers the upper part of the first tank (401), the air inlet side of the first fan (404) is connected to the first air collecting hood (403) through a pipe, and the air outlet side of the first fan (404) is connected to the first air supply hood (402) through the first electric heater (405).

2. A hot air shrink oven for bowl-shaped food packaging according to claim 1, characterized in that, The first trough (401) is provided with a lower air outlet section, an upper and lower air outlet section and a full air outlet section. The lower air outlet section is provided with a first air outlet (406) only at the bottom. The upper and lower air outlet sections are provided with a first air outlet (406) only at the top and bottom. The full air outlet section is provided with a first air outlet (406) at the top, middle and bottom.

3. A hot air shrink oven for bowl-shaped food packaging according to claim 1, characterized in that, The air outlet (406) is parallel to the horizontal plane.

4. A hot air shrink oven for bowl-shaped food packaging according to claim 1, characterized in that, The first air supply hoods (402) on both sides of the first tank (401) are connected by the first connecting pipe (407), and the first electric heater (405) is connected to the first connecting pipe (407).

5. A hot air shrink oven for bowl-shaped food packaging according to claim 1, characterized in that, The first fan (404) is connected to the first air supply hood (402) via the first support frame (408).

6. A hot air shrink oven for bowl-shaped food packaging according to claim 1, characterized in that, The heat preservation cavity assembly (3) includes: a second trough (301), a second air supply hood (302), a second air collection hood (303), a second fan (304), and a second electric heater (305). The upper part of the second trough (301) is provided with a second air intake hole, and the two sides of the second trough (301) are provided with second air outlet holes (306). The second air supply hood (302) covers the two sides of the second trough (301), and the second air collection hood (303) covers the upper part of the second trough (301). The air inlet side of the second fan (304) is connected to the second air collection hood (303) through a pipe, and the air outlet side of the second fan (304) is connected to the second air supply hood (302) through the second electric heater (305).

7. A hot air shrink oven for bowl-shaped food packaging according to claim 6, characterized in that, The second trough (301) is provided with second air outlets (306) on the upper, middle and lower parts of both sides.

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