A top heat sealing device and heat sealing method for a carton

Abstract

This invention relates to the field of packaging technology and discloses a top heating device and method for sealing the top of a packaging box. The top heating device includes a jetting assembly and a gas supply assembly. The jetting assembly includes multiple first jet nozzles corresponding to the sidewalls of the top of the packaging material and multiple second jet nozzles corresponding to the bottle opening structure of the packaging box. The first jet nozzles are located inside the sidewalls of the top of the packaging material and opposite to them. The second jet nozzles are located outside the connecting wall of the bottle opening structure and opposite to it. In this top heating device, the first and second jet nozzles of the jetting assembly can accurately spray hot gas to heat the top sidewalls of the packaging material and the connecting wall of the bottle opening structure, respectively, resulting in better activation of the top of the packaging material and the connecting wall. This leads to a good forming connection between the top of the packaging material and the connecting wall, better sealing, and improved yield of the finished packaging box.

Description

Technical Field

[0001] This invention relates to the field of packaging technology, and in particular to a device and method for heat-heating the top of a packaging box before sealing it. Background Technology

[0002] Currently, beverage packaging typically consists of a bottle neck structure bonded to a cylindrical packaging material. The bottle neck structure generally includes a fixed base and a spout connected to the base. The packaging material has longitudinal seams in its side walls, and the fixed base has an outwardly extending connecting wall at the end opposite the spout. This connecting wall is bonded to the compressed side walls around the top of the packaging material, achieving a sealed connection between the bottle neck structure and the top of the packaging material. Currently, the bonding process typically involves first heating the connecting wall of the base and the top of the packaging material, then pressing them together. However, current methods involve a large heating range for both the packaging material and the bottle neck structure, resulting in lower precision in heating the connecting wall and the connection point at the top of the packaging material. This can easily lead to incomplete heating, resulting in a poor seal between the bottle neck structure and the top of the packaging material, thus reducing product yield. Summary of the Invention

[0003] This invention discloses a top heating device and method for sealing the top of a packaging box, as well as packaging box forming equipment. In the top heating device for sealing the top of a packaging box, the first and second air jets of the jet assembly can accurately spray hot gas to heat the top sidewall of the packaging material and the connecting wall of the bottle mouth structure, respectively. This results in a good activation degree of the top of the packaging material and the connecting wall, leading to a good forming connection and good sealing performance between the top of the packaging material and the connecting wall, which is beneficial to improving the yield of finished packaging boxes.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A top heat-sealing device for a packaging box before sealing, comprising:

[0006] A jetting assembly includes a plurality of first jet nozzles corresponding to the sidewall of the top of the packaging material of a packaging box, and a plurality of second jet nozzles corresponding to the bottle opening structure of the packaging box. The first jet nozzles are located inside the sidewall of the top of the packaging material and opposite to the sidewall of the top of the packaging material, and the second jet nozzles are located outside the connecting wall of the bottle opening structure and opposite to the connecting wall. When the jetting assembly is in a first operating condition, the first jet nozzles opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material spray hot air onto the area where the connecting longitudinal seam is located on the top of the packaging material, and the second jet nozzles spray hot air onto the connecting wall. When the jetting assembly is in a second operating condition, the first jet nozzles spray hot air onto the sidewall of the top periphery of the packaging material, and the second jet nozzles spray hot air onto the connecting wall.

[0007] An air supply assembly for supplying hot air to the jet assembly.

[0008] In the aforementioned top heating device before sealing the top of the packaging box, the first and second jet nozzles of the jet assembly can accurately spray hot gas to heat the top sidewall of the packaging material and the connecting wall of the bottle mouth structure, respectively, which makes the top of the packaging material and the connecting wall more active, resulting in a good forming connection between the top of the packaging material and the connecting wall, and better sealing performance, which is conducive to improving the yield of finished packaging boxes.

[0009] Optionally, the jet assembly includes a first jet component and a second jet component;

[0010] The first jet component includes: a first outer shell and a first inner shell. The first outer shell has a cylindrical structure and is fitted around the outer periphery of the first inner shell. A first end of the first outer shell is aligned with the first end of the first inner shell, and a second end of the first outer shell is aligned with the second end of the first inner shell. A first ventilation cavity is formed between the periphery of the first inner shell and the first outer shell. The first end of the first outer shell is sealed to the first end of the first inner shell, and a first air inlet is formed between the second end of the first outer shell and the second end of the first inner shell. A first air outlet is provided on one side wall of the first outer shell, communicating with the first ventilation cavity. The first air outlet is only used to face the area where the longitudinal seam of the top periphery of the packaging material is located, so that the first air outlet constitutes the first jet port of the jet component when it is in the first working condition. A first concave structure with an open opening is formed at the first end of the first inner shell. The first concave structure is used to accommodate the bottle mouth structure. A second air outlet is provided on the edge of the first end of the first inner shell, distributed around the axis of the first outer shell. The second air outlet constitutes the second jet port of the jet component when it is in the first working condition.

[0011] The second jet component includes: a second outer shell and a second inner shell. The second outer shell has a cylindrical structure and is fitted onto the outer periphery of the second inner shell. A first end of the second outer shell is aligned with a first end of the second inner shell, and a second end of the second outer shell is aligned with a second end of the second inner shell. A second ventilation cavity is formed between the periphery of the second inner shell and the two outer shells. The first end of the second outer shell is sealed to the first end of the second inner shell, and a second air inlet is formed between the second end of the second outer shell and the second end of the second inner shell. A third vent is provided on the side wall, which is distributed around the axis of the second outer shell and communicates with the second ventilation cavity. The third vent is used to face the side wall on the top periphery of the packaging material so that the third vent constitutes the first air outlet of the air jet assembly when it is in the second operating condition. The first end of the second inner shell has a second concave structure with an opening, which is used to accommodate the bottle mouth structure. The edge of the first end of the second inner shell is provided with a fourth vent distributed around the axis of the second outer shell. The fourth vent constitutes the second air outlet of the air jet assembly when it is in the second operating condition.

[0012] Optionally, the first jet component further includes a first connecting seat, the second end of the first outer shell and the second end of the first inner shell are connected to the first connecting seat, and the first connecting seat is provided with a first air inlet communicating with the first ventilation cavity;

[0013] The second jet component also includes a second connecting seat, the second end of the second outer shell and the second end of the second inner shell are connected to the second connecting seat, and the second connecting seat is provided with a second air inlet that communicates with the second ventilation chamber.

[0014] Optionally, when the first outer shell is opposite to the side wall of the packaging material, the orthographic projection of the area where the first vent is located on the side wall of the packaging material covers the connecting longitudinal seam on the side wall of the packaging material, and the first vent is located on both sides of the connecting longitudinal seam.

[0015] Optionally, the sidewall of the first housing is provided with at least two rows of first vent holes arranged along the extension direction of the axis of the first housing, each row including a plurality of first vent holes, and the arrangement direction of the plurality of first vent holes in each row is perpendicular to the axis of the first housing.

[0016] Optionally, in at least two rows of the first vent holes, the diameter of the first vent hole in the row closest to the first end of the first housing is larger than the diameter of the first vent hole in the other rows.

[0017] Optionally, in at least two rows of the first air outlets, the first air outlets in each two adjacent rows are staggered.

[0018] Optionally, each sidewall of the edge portion of the first end of the first inner shell is provided with at least two rows of second air outlets, each row including multiple second air outlets, and the arrangement direction of the multiple second air outlets in each row is perpendicular to the axis of the first outer shell.

[0019] Optionally, in at least two rows of the second air outlets, the second air outlets in each adjacent pair of rows are staggered.

[0020] Optionally, each side wall of the second outer casing is provided with at least two rows of the third vent holes arranged along the extension direction of the axis of the second outer casing, each row including a plurality of the third vent holes, and the arrangement direction of the plurality of third vent holes in each row is perpendicular to the axis of the second outer casing.

[0021] Optionally, in at least two rows of the third vent holes, the diameter of the third vent hole in the row closest to the first end of the second housing is larger than the diameter of the third vent hole in the other rows.

[0022] Optionally, in at least two rows of the third vent holes, the third vent holes in each adjacent pair of rows are staggered.

[0023] Optionally, a connecting ridge is formed between every two adjacent sidewalls in the second outer casing. The extending direction of the connecting ridge is parallel to the extending direction of the axis of the second outer casing. A plurality of through holes are provided on the connecting ridge, arranged sequentially along the extending direction of the connecting ridge. The through holes communicate with the second ventilation cavity.

[0024] Optionally, the diameter of the through hole is larger than the diameter of the third vent hole in a row near the second end of the second housing.

[0025] Optionally, each sidewall of the second housing has an oblique through hole near the edge of the connecting ridge. The oblique through hole is located on the side of the third vent facing the first end of the second housing. In a cross section perpendicular to the axis of the second housing, the two sidewalls of the second housing connected to the same connecting ridge are divided into a first sidewall and a second sidewall. The axis of the oblique through hole on the first sidewall intersects the extension direction of the second sidewall on the side of the first sidewall away from the second sidewall, and the axis of the oblique through hole on the second sidewall intersects the extension direction of the first sidewall on the side of the second sidewall away from the first sidewall.

[0026] Optionally, each sidewall of the edge portion of the first end of the second inner housing is provided with at least two rows of the fourth vent holes, each row including a plurality of the fourth vent holes, and the arrangement direction of the second vent holes in each row is perpendicular to the axis of the second outer housing.

[0027] Optionally, in at least two rows of the third vent, the fourth vent in each adjacent row is staggered.

[0028] Optionally, the jet assembly includes:

[0029] A third outer shell and a third inner shell, the third outer shell having a cylindrical structure, the third outer shell being fitted onto the outer periphery of the third inner shell, the first end of the third outer shell being aligned with the first end of the third inner shell, the second end of the third outer shell being aligned with the second end of the third inner shell, a third venting cavity being formed between the periphery of the third inner shell and the third outer shell, the first end of the third outer shell being sealed to the first end of the third inner shell, and a third air inlet being formed between the second end of the third outer shell and the second end of the third inner shell; a fifth air outlet is provided on the side wall of the periphery of the third outer shell, distributed around the axis of the third outer shell and communicating with the third venting cavity; the first end of the third inner shell forms a third concave structure with an open opening, the third concave structure being used to accommodate the bottle mouth structure, and a sixth air outlet is provided on the edge of the first end of the third inner shell, distributed around the axis of the third outer shell;

[0030] A shielding plate is fitted onto the outer periphery of the third outer shell. The shielding plate is movably mounted on the third outer shell along the extension direction of the axis of the third outer shell. The shielding plate has a notch opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material. When the shielding plate is in the first shielding position, part of the fifth vent is exposed at the notch, and the shielding plate covers the remaining fifth vents. When the shielding plate is in the open position, the shielding plate avoids all the fifth vents, so that all the fifth vents are exposed.

[0031] The present invention also provides a packaging box forming device, including any of the packaging box top sealing preheating devices provided by the above technical solutions.

[0032] This invention also provides a method for heat-heating the top of a packaging box before sealing, using any of the heat-heating devices provided in the above technical solutions, the method comprising:

[0033] Align the packaging material and bottle neck structure of the packaging box with the jet assembly, so that the first jet nozzle of the jet assembly is opposite to the inner side of the side wall of the top of the packaging material, and the second jet nozzle of the jet assembly is opposite to the outer side of the connecting wall of the bottle neck structure.

[0034] The first heating is performed, in which the first jet nozzle, which is opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material, sprays hot air onto the area where the connecting longitudinal seam is located on the top of the packaging material, and the second jet nozzle sprays hot air onto the connecting wall.

[0035] After the first heating is completed, a second heating is performed, in which the first jet nozzle sprays hot air onto the side wall of the top periphery of the packaging material, and the second jet nozzle sprays hot air onto the connecting wall.

[0036] Optionally, during the first heating, the gas pressure inside the jet assembly is greater than or equal to 9 mbar to 13 mbar, the gas temperature inside the jet assembly is 320°C to 370°C, and the duration of the first heating is 450 ms to 650 ms.

[0037] During the second heating, the gas pressure inside the jet assembly is greater than or equal to 2 mbar to 4 mbar, the gas temperature inside the jet assembly is 290℃ to 340℃, and the duration of the first heating is 450 ms to 650 ms.

[0038] Optionally, after the first heating is completed and before the second heating begins, the interval between the first heating and the second heating is less than or equal to 1500ms. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the first jet component of a top heating device before sealing the top of a packaging box, provided in an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram of the structure of the second jet component of a top heating device before sealing the top of a packaging box, provided in an embodiment of the present invention.

[0041] Figure 3 A side cross-sectional view of the second jet component of a top heating device before sealing the top of a packaging box, provided in an embodiment of the present invention;

[0042] Figure 4 A schematic diagram illustrating the interaction between the second jet component of a pre-sealing heat treatment device for a packaging box and the packaging box before sealing, as provided in an embodiment of the present invention.

[0043] Figure 5 This is a schematic diagram of the structure of the first outer shell of a first jet component provided in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of the structure of the second outer shell of a second jet component provided in an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the structure of the second outer shell of a second jet component provided in an embodiment of the present invention;

[0046] Figure 8 This is a cross-sectional schematic diagram of the corner of the second outer shell of a second jet component provided in an embodiment of the present invention;

[0047] Figure 9 A schematic diagram illustrating the interaction between the third jet component of a pre-sealing heat treatment device for a packaging box and the packaging box before sealing, as provided in an embodiment of the present invention.

[0048] Figure 10 This is a schematic diagram of the structure of the third outer shell of a third jet component provided in an embodiment of the present invention;

[0049] Figure 11 This is a partial structural diagram of a packaging box forming device provided in an embodiment of the present invention;

[0050] icon:

[0051] 1-Jet assembly; 2-Packaging material; 3-Bottle mouth assembly; 4-Carrier device; 5-Support assembly; 11-First jet nozzle; 12-Second jet nozzle; 13-First jet component; 14-Second jet component; 15-Third jet component; 31-Bottle mouth; 32-Connecting wall; 41-Spindle wheel; 42-Spindle rod; 51-First support; 52-Second support; 131-First outer shell; 132-First inner shell; 133-First venting chamber; 134-First air inlet; 135-First connecting seat; 141-Second outer shell; 142-Second inner shell; 143-Second venting chamber; 144-Second air inlet; 145-Second connecting seat; 151 - Third outer shell; 152 - Third inner shell; 153 - Third vent cavity; 154 - Third air inlet; 155 - Baffle plate; 156 - Third connecting seat; 1311 - First air outlet; 1321 - First concave structure; 1322 - Second air outlet; 1351 - First air inlet; 1411 - Third air outlet; 1412 - Connecting ridge; 1413 - Through hole; 1414 - Oblique through hole; 1421 - Second concave structure; 1422 - Fourth air outlet; 1451 - Second air inlet; 1511 - Fifth air outlet; 1521 - Third concave structure; 1522 - Sixth air outlet; 1551 - Notch; 1561 - Third air inlet. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a top heating device before sealing the top of a packaging box. Before sealing the top of the packaging box, the packaging material and the bottle mouth structure are separate and not yet connected. The packaging material has a side wall surrounding an axis, and a longitudinal slit parallel to the axis is provided in one side wall. The bottle mouth structure includes a bottle mouth and a fixing part connected to one end of the bottle mouth. The fixing part has a connecting wall extending outward on the side away from the bottle mouth. The connecting wall is used to connect with the top of the packaging material. Before sealing the top of the packaging box, the bottle mouth structure is fixed on a base, and the packaging material is sleeved around the base. The top of the packaging material and the bottle mouth structure face the same direction. The top side wall of the packaging material surrounds the bottle mouth, and the top end face of the packaging material extends slightly beyond the top side of the bottle mouth. In this way, both the packaging material and the bottle mouth structure are fixed on the base, and the top of the side wall of the packaging material surrounds the bottle mouth. The packaging material can be sealed and connected after heating the side wall of the top of the packaging material and the connecting wall of the bottle mouth structure.

[0054] The pre-sealing top heating device for the packaging box is used to heat the connecting wall between the packaging material and the bottle neck structure of the packaging box. Specifically, the pre-sealing top heating device includes a jet assembly 1 and a gas supply assembly. The jet assembly 1 includes multiple first jet nozzles 11 and multiple second jet nozzles 12. The first jet nozzles 11 correspond to the side wall of the top of the packaging material 2 of the packaging box, and are located inside the side wall of the top of the packaging material 2 and opposite to the inner surface of the side wall of the top of the packaging material 2. The first jet nozzles 11 can spray hot air onto the side surface of the side wall of the top of the packaging material. The second jet nozzles 12 correspond to the bottle neck structure 3 of the packaging box, and are located outside the connecting wall 32 of the bottle neck structure 3 and opposite to the connecting wall 32. The second jet nozzles 12 are used to spray hot air onto the outer surface of the connecting wall. When the jet assembly 1 is in the first working condition, it only heats the packaging material. The first jet nozzle 11, located opposite the longitudinal seam on the top periphery of the packaging material 2, sprays hot air onto the longitudinal seam area on the top of the packaging material 2, thereby heating the longitudinal seam area on the top of the packaging material (heating is also referred to as activation in this document). At the same time, the second jet nozzle 12 sprays hot air onto the connecting wall, thereby heating the connecting wall of the bottle mouth structure. When the jet assembly 1 is in the second working condition, the first jet nozzle 11 sprays hot air onto the side wall on the top periphery of the packaging material 2, thereby heating all the side walls on the top of the packaging material. The second jet nozzle 12 sprays hot air onto the connecting wall, thereby heating the connecting wall of the bottle mouth structure. During operation, the air supply assembly supplies hot air to the jet assembly, so that the first and second jet nozzles of the jet assembly can spray hot air. The top heating device before sealing the top of the packaging box allows for heating of the packaging material and the connecting wall of the bottle neck structure under two working conditions. In the first working condition, the longitudinal seam at the top of the packaging material can be accurately preheated. Due to the thick layer of packaging material at the connecting seam, preheating allows for further heating of the connecting seam when the second jet nozzle heats the surrounding sidewalls in the second working condition, resulting in better activation. At the bottle neck structure, the second jet nozzle heats the connecting wall in the first working condition and again in the second working condition, further enhancing the activation of the connecting wall. Thus, the first jet nozzle accurately heats the forming connection at the top of the packaging material, and the second jet nozzle accurately heats the connecting wall of the bottle neck structure, resulting in good activation of both the top of the packaging material and the connecting wall. After heating, the subsequent forming and sealing connection of the packaging material and the connecting wall ensures a tight bond between the top of the packaging material and the connecting wall, enhancing the sealing performance and improving the yield of the finished packaging box. Furthermore, the spray range of the first and second air nozzles is accurate enough to heat the top of the packaging material and the connecting walls without causing excessive heating or adverse effects on other parts of the packaging box, thus ensuring the good performance of the packaging box.

[0055] Therefore, in the above-mentioned top heating device before sealing the top of the packaging box, the first and second jet nozzles of the jet assembly can accurately spray hot gas to heat the top side wall of the packaging material and the connecting wall of the bottle mouth structure, respectively, and make the top of the packaging material and the connecting wall more activated, resulting in a good forming connection between the top of the packaging material and the connecting wall, and better sealing, which is conducive to improving the yield of the finished packaging box.

[0056] Specifically, there are multiple configuration options for the jet assembly, such as:

[0057] Method 1:

[0058] refer to Figure 1 , Figure 2 As shown, the jet assembly 1 may include a first jet component 13 and a second jet component 14. Wherein, as... Figure 1As shown, the first jet component 13 includes a first outer shell 131 and a first inner shell 132. The first outer shell 131 has a cylindrical structure and is fitted onto the outer periphery of the first inner shell 132. The first end of the first outer shell 131 is aligned with the first end of the first inner shell 132, and the second end of the first outer shell 131 is aligned with the second end of the first inner shell 132. A first ventilation cavity 133 is formed between the periphery of the first inner shell 132 and the first outer shell 131. The first end of the first outer shell 131 is sealed to the first end of the first inner shell 132. Next, a first air inlet 134 is formed between the second end of the first outer shell 131 and the second end of the first inner shell 132. The air supply assembly can communicate with the first air inlet to provide hot air to the first air inlet, and the hot air enters the first ventilation chamber. A first air outlet 1311 communicating with the first ventilation chamber 133 is provided on the side wall of one side of the first outer shell 131. The first air outlet 1311 is only opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material 2, so that the first air outlet 1311 constitutes the first air outlet 11 of the jet assembly 1 when it is in the first working condition. The first inner shell 132's first The first inner shell 132 has a first concave structure 1321 with an opening, which is used to accommodate the bottle mouth structure 3. The edge of the first end of the first inner shell 132 is provided with a second vent 1322 distributed around the axis of the first outer shell 131. The second vent 1322 constitutes the second air outlet 12 when the air jet assembly 1 is in the first working condition. When the first air jet component heats the packaging material and the bottle mouth structure, the base supports the packaging material and the bottle mouth structure. The top of the packaging material is fitted from the first end of the first outer shell onto the outer periphery of the first outer shell, and the bottle mouth extends into the first concave structure of the first inner shell. Within the structure, the first end edge of the first inner shell is adapted to the connecting wall of the bottle mouth structure. Specifically, the first end edge of the first inner shell is parallel to the connecting wall, so the second vent can be directly opposite the connecting wall. The second vent can spray air directly onto the connecting wall. There is a gap between the first end edge of the first inner shell and the connecting wall. The gap is not too large, so that the hot air sprayed from the second vent can be accurately sprayed onto the connecting wall. The first vent is opposite to the longitudinal seam of the surrounding packaging material, so hot air can be sprayed onto the area where the longitudinal seam is located to heat it accurately.

[0059] like Figure 2 and Figure 4As shown, the second jet component 14 includes a second outer shell 141 and a second inner shell 142. The second outer shell 141 has a cylindrical structure and is fitted onto the outer periphery of the second inner shell 142. The first end of the second outer shell 141 is aligned with the first end of the second inner shell 142, and the second end of the second outer shell 141 is aligned with the second end of the second inner shell 142. A second ventilation cavity 143 is formed between the periphery of the second inner shell 142 and the second outer shell 141. The first end of the second outer shell 141 is sealed to the first end of the second inner shell 142. A second air inlet 144 is formed between the second end of the outer shell 141 and the second end of the inner shell 142. An air supply assembly can communicate with the second air inlet to provide hot air into the second air inlet, which then enters the second ventilation chamber. A third air outlet 1411 is provided on the side wall of the outer shell 141, distributed around the axis of the second shell 141 and communicating with the second ventilation chamber 143. The third air outlet 1411 is positioned opposite the side wall of the top periphery of the packaging material 2, thus constituting the first air outlet 11 of the jet assembly 1 when it is in the second operating condition. The second inner shell... The first end of the second inner shell 142 has a second concave structure 1421 with an opening, which is used to accommodate the bottle mouth structure 3. The edge of the first end of the second inner shell 142 is provided with a fourth vent 1422 distributed around the axis of the second outer shell 141. The fourth vent 1422 constitutes the second jet port 12 when the jet assembly 1 is in the second working condition. When the second jet component heats the packaging material and the bottle mouth structure, the base supports the packaging material and the bottle mouth structure. The top of the packaging material is fitted from the first end of the second outer shell onto the outer periphery of the second outer shell, and the bottle mouth extends into the second inner shell. Within the concave structure, the first edge of the second inner shell is adapted to the connecting wall of the bottle mouth structure. Specifically, the first edge of the second inner shell is parallel to the connecting wall, so the fourth vent can be directly opposite the connecting wall. The fourth vent can spray air directly onto the connecting wall, and there is a gap between the first edge of the second inner shell and the connecting wall. The gap is not too large, so that the hot air sprayed from the fourth vent can be accurately sprayed onto the connecting wall. The third vent is opposite to the longitudinal seam of the surrounding packaging material, so that hot air can be sprayed onto the area where the longitudinal seam is located for heating, and the heating area is accurate.

[0060] In specific implementation, in method one above, such as Figure 1As shown, the first jet component 13 also includes a first connecting seat 135. The second end of the first outer shell 131 and the second end of the first inner shell 132 are connected to the first connecting seat 135. The first connecting seat 135 is provided with a first air inlet 1351 that communicates with the first ventilation chamber 133. The second ends of the first outer shell and the second ends of the first inner shell are both sealed to the first connecting seat. The first connecting seat is opposite to the first air inlet and blocks the first air inlet. The first air inlet on the first connecting seat can communicate with the first air inlet, so that hot air can enter the first ventilation chamber. The second ends of the first outer shell and the second ends of the first inner shell are both fixed to the first connecting seat, and the connection stability is good, ensuring the structural stability between the first inner shell and the first outer shell. In addition, the second jet component 14 also includes a second connecting seat 145. The second end of the second outer shell 141 and the second end of the second inner shell 142 are connected to the second connecting seat 145. The second connecting seat 145 is provided with a second air inlet 1451 that communicates with the second ventilation chamber 143. The second end of the second outer shell and the second end of the second inner shell are both sealed to the second connecting seat. The second connecting seat is opposite to the second air inlet and blocks the second air inlet. The second air inlet on the second connecting seat can communicate with the second air inlet, so that hot air can enter the second ventilation chamber. The second end of the second outer shell and the second end of the second inner shell are both fixed to the second connecting seat, and the connection stability is good, ensuring the structural stability between the second inner shell and the second outer shell.

[0061] Specifically, in method one above, refer to Figure 1 and Figure 5 As shown, when the first outer shell 131 is opposite to the side wall of the packaging material 2, the orthographic projection of the area where the first vent 1311 is located on the side wall of the packaging material 2 covers the connecting longitudinal seam on the side wall of the packaging material 2. The first vent 1311 is located on both sides of the connecting longitudinal seam, so that the first vent 1311 is located on both sides of the connecting longitudinal seam, which can make the activation around the connecting longitudinal seam uniform and make the activation of the connecting longitudinal seam of the packaging material good.

[0062] In specific implementation, such as Figure 5 As shown, at least two rows of first vent holes 1311 are arranged on the side wall of the first outer casing 131 along the extension direction of the axis of the first outer casing 131. Each row includes multiple first vent holes 1311, and the arrangement direction of the multiple first vent holes 1311 in each row is perpendicular to the axis of the first outer casing 131. Specifically, two rows of first vent holes can be provided to ensure the air volume, ensure sufficient airflow for heating the packaging material, and better heat the longitudinal seam connecting the top side wall of the packaging material.

[0063] Specifically, in the above-mentioned at least two rows of first vent holes 1311, the diameter of the first vent hole 1311 in the row closest to the first end of the first outer shell 131 is larger than the diameter of the first vent hole 1311 in the other rows. Since most of the airflow flows out along the outlet at the top of the packaging material after it flows out from the first vent hole, that is, most of the airflow flows towards the second end of the first outer shell. At this time, most of the airflow flowing out from the first vent hole near the first end of the first outer shell has to pass through the first vent hole near the second end of the first shell. Therefore, there is always hot airflow passing through the part of the top sidewall of the packaging material near the second end of the first outer shell, and the temperature here will always be maintained. By setting the diameter of the first vent hole in the row closest to the first end of the first outer shell to be slightly larger and the airflow slightly increased, the overall heating temperature of the top sidewall of the packaging material can be balanced, so that the top sidewall of the packaging material is heated evenly.

[0064] Furthermore, to increase the heating uniformity of the top sidewalls of the packaging material, such as Figure 5 As shown, in at least two rows of first air outlets 1311, the first air outlets 1311 in each adjacent pair of rows are staggered.

[0065] Meanwhile, regarding the arrangement of the second vent on the first inner shell, in one possible implementation, such as... Figure 1 As shown, each side wall of the edge portion of the first end of the first inner housing 132 is provided with at least two rows of second vent holes 1322, each row including multiple second vent holes 1322, and the arrangement direction of the multiple second vent holes 1322 in each row is perpendicular to the axis of the first outer housing 131. Specifically, two rows of second vent holes can be provided to ensure the air output, ensure sufficient airflow for heating the connecting wall, and better heat the connecting wall.

[0066] To increase the uniformity of heating of the connecting wall, the second vent holes 1322 in at least two rows are staggered in every two adjacent rows.

[0067] In the above method one, such as Figure 2 and Figure 6 As shown, each side wall of the second outer casing 141 is provided with at least two rows of third vent holes 1411 arranged along the extension direction of the axis of the second outer casing 141. Each row includes multiple third vent holes 1411, and the arrangement direction of the multiple third vent holes 1411 in each row is perpendicular to the axis of the second outer casing 141. Specifically, two rows of third vent holes can be provided to ensure the air volume, ensure sufficient airflow for heating the packaging material, and better heat the top side wall of the packaging material.

[0068] Specifically, in the at least two rows of third vent holes 1411 mentioned above, the diameter of the third vent hole 1411 in the row closest to the first end of the second outer shell 141 is larger than the diameter of the third vent hole 1411 in the other rows. Since most of the airflow flows out along the outlet at the top of the packaging material after it flows out from the third vent hole, that is, most of the airflow flows towards the second end of the second outer shell, most of the airflow flowing out from the third vent hole near the first end of the second outer shell passes through the third vent hole near the second end of the second shell. Therefore, hot airflow always passes through the part of the top sidewall of the packaging material near the second end of the second outer shell, and the temperature here will always be maintained. By setting the diameter of the third vent hole in the row closest to the first end of the second outer shell to be slightly larger and the airflow slightly increased, the overall heating temperature of the top sidewall of the packaging material can be balanced, so that the top sidewall of the packaging material is heated evenly.

[0069] Furthermore, in at least two rows of third vent holes 1411, the third vent holes 1411 in each adjacent pair of rows are staggered, which can increase the heating uniformity of the top sidewall of the packaging material.

[0070] Additionally, preferably, such as Figure 6 As shown, a connecting ridge 1412 is formed between every two adjacent sidewalls in the second outer casing 141. The extending direction of the connecting ridge 1412 is parallel to the extending direction of the axis of the second outer casing 141. Multiple through holes 1413 are arranged sequentially along the extending direction of the connecting ridge 1412, and the through holes 1413 communicate with the second venting cavity 143. The connecting ridge corresponds to the edge of the packaging material. The through holes on the connecting ridge allow for air jetting, which ensures good heating at the corners of the packaging material, good activation at the edges of the packaging material, strong adhesion, and increased sealing.

[0071] refer to Figure 4 ,like Figure 6 and Figure 7 As shown, since there is a certain gap between the packaging material and the second outer shell, the gap between the edge of the packaging material and the connecting edge of the second outer shell is greater than the gap between the side wall of the packaging material and the side wall of the second outer shell. Therefore, the diameter of the through hole 1413 is larger than the diameter of the third vent hole 1411 in the row near the second end of the second outer shell 141. This allows the air output of the through hole at the connecting edge to be slightly larger, ensuring that the heating temperature at the edge of the packaging material is uniform with the heating temperature at the side wall of the packaging material, ensuring that the overall heating temperature of the top of the packaging material is uniform, ensuring good activation of the top of the packaging material, ensuring tight and firm adhesion during folding and forming, and ensuring airtightness.

[0072] like Figure 7 and Figure 8As shown, to further increase the heating temperature uniformity between the edge area and sidewalls of the packaging material, an oblique through hole 1414 is provided in the edge of each sidewall of the second outer shell 141 near the connecting edge 1412. The oblique through hole 1414 is located on the side of the third vent 1411 facing the first end of the second outer shell 141. In a cross-section perpendicular to the axis of the second outer shell 141, and with the two sidewalls of the second outer shell 141 connected to the same connecting edge 1412 divided into a first sidewall and a second sidewall, the axis of the oblique through hole 1414 on the first sidewall intersects the extension direction of the second sidewall on the side of the first sidewall away from the second sidewall, and the axis of the oblique through hole 1414 on the second sidewall intersects the extension direction of the first sidewall on the side of the second sidewall away from the first sidewall. Adding oblique through holes in the edge of each sidewall of the second outer shell near the connecting edge can further improve the heating uniformity of the top of the packaging material.

[0073] Furthermore, the distribution range of the oblique through holes on the sidewall near the connecting edge allows the distribution of the oblique through holes to correspond to the folded portion of the packaging material's top edge where it is folded and pasted. This adapts the distribution range of the oblique through holes on the sidewall near the connecting edge to the shape to be bent at the top of the packaging material, thus improving the heating of the top edge of the packaging material.

[0074] Regarding the fourth vent on the second inner housing, one possible implementation is as follows: Figure 3 As shown, each side wall of the edge portion of the first end of the second inner housing 142 is provided with at least two rows of fourth vent holes 1422, each row including multiple fourth vent holes 1422, and the arrangement direction of the second vent holes 1322 in each row is perpendicular to the axis of the second outer housing 141. Specifically, two rows of fourth vent holes can be provided to ensure the air volume, ensure sufficient airflow for heating the connecting wall, and better heat the connecting wall.

[0075] Specifically, in the above-mentioned at least two rows of third air outlets 1411, the fourth air outlets 1422 in each of the two adjacent rows are staggered, which can increase the heating uniformity of the connecting wall.

[0076] Method 2:

[0077] like Figure 9 and Figure 10As shown, the jet assembly 1 includes a third jet component 15, which specifically includes a third outer shell 151, a third inner shell 152, and a baffle 155 fitted onto the outer periphery of the third outer shell 151. The third outer shell 151 has a cylindrical structure and is fitted onto the outer periphery of the third inner shell 152. The first end of the third outer shell 151 is aligned with the first end of the third inner shell 152, and the second end of the third outer shell 151 is aligned with the second end of the third inner shell 152. A third ventilation cavity 153 is formed between the periphery of the third inner shell 152 and the third outer shell 151. The first end of the third outer shell 151 is sealed to the first end of the third inner shell 152. A third air inlet 154 is formed between the second end of the third outer shell 151 and the second end of the third inner shell 152. The air supply assembly can communicate with the third air inlet to provide hot air to the third air inlet, and the hot air enters the third ventilation chamber. A fifth air outlet 1511 is provided on the side wall around the periphery of the third outer shell 151, which is distributed around the axis of the third outer shell 151 and communicates with the third ventilation chamber 153. The first end of the third inner shell 152 forms a third concave structure 1521 with an opening, which is used to accommodate the bottle mouth. Structure 3: A sixth vent 1522 is provided on the edge of the first end of the third inner housing 152, distributed around the axis of the third outer housing 151; a shielding plate 155 is movably mounted on the third outer housing 151 along the extension direction of the axis of the third outer housing 151, the shielding plate 155 has a notch 1551 opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material 2, the shielding plate has shielding positions and opening positions arranged along the extension direction of the axis of the third outer housing on the third outer housing, and the shielding plate can be driven to be connected to a drive mechanism, the drive mechanism being used to drive the shielding plate along the extension direction of the axis of the third outer housing. The back-and-forth movement allows the shielding plate to switch between the shielding position and the open position. When the shielding plate 155 is in the shielding position, the fifth air outlet 1511 is exposed at the notch 1551, and the shielding plate 155 covers the remaining fifth air outlets 1511. The exposed fifth air outlets here constitute the first air jet in the first working condition. When the shielding plate 155 is in the open position, the shielding plate 155 avoids all the fifth air outlets 1511, so that all the fifth air outlets 1511 are exposed. All the fifth air outlets constitute the first air jet in the second working condition. The sixth air outlet on the first inner shell is always unobstructed and can constitute the second air jet.When the third jet component heats the packaging material and the bottle neck structure, the base supports the packaging material and the bottle neck structure. The top of the packaging material is fitted onto the outer periphery of the third outer shell from the first end. The bottle neck extends into the third concave structure of the third inner shell, and the first edge of the third inner shell is adapted to the connecting wall of the bottle neck structure. Specifically, the first edge of the third inner shell is parallel to the connecting wall, so the sixth vent can be directly opposite the connecting wall. The sixth vent can spray air directly onto the connecting wall. Furthermore, by using a baffle plate to block part of the fifth vent, the heating of the two parts of the packaging material sidewall by the third jet component is changed. The overall structure is compact, saves equipment space, and can accurately heat the top sidewall of the packaging material and the connecting wall of the bottle neck structure.

[0078] In method two above, such as Figure 9 As shown, the third jet component 15 also includes a third connecting seat 156. The second end of the third outer shell 151 and the second end of the third inner shell 152 are connected to the third connecting seat 156. The third connecting seat 156 is provided with a third air inlet 1561 that communicates with the third ventilation chamber 153. The second ends of the third outer shell and the third inner shell are both sealed to the third connecting seat. The third connecting seat is opposite to the third air inlet and blocks the third air inlet. The third air inlet on the third connecting seat can communicate with the third air inlet, so that hot air can enter the third ventilation chamber. The second ends of the third outer shell and the third inner shell are both fixed to the third connecting seat, and the connection stability is good, ensuring the structural stability between the third inner shell and the third outer shell.

[0079] This embodiment also provides a packaging box forming device, including any of the packaging box top sealing pre-heating devices provided in the above embodiments, and a carrier for carrying the packaging material and bottle mouth structure. The carrier includes a base, the packaging material is sleeved on the outer periphery of the base, the bottle mouth structure is fixed to the top of the base, and the opening of the top of the packaging material faces the same direction as the opening of the bottle mouth.

[0080] Specifically, such as Figure 11 As shown, the above-mentioned packaging box forming equipment also includes a transport device 4 for transporting packaging materials and bottle neck structures, and a support assembly 5 for installing air jet components. The transport device 4 includes a spindle wheel 41 and a plurality of mandrels 42 connected to the spindle wheel 41. The spindle wheel 41 can rotate counterclockwise. One end of each mandrel 42 is connected to the wheel surface of the spindle wheel 41, and the axis of the mandrel 42 is the same as the axis of the spindle wheel 41. The mandrels 42 extend along the radial direction of the spindle wheel 41, and the plurality of mandrels 42 are distributed at intervals on the outer periphery of the spindle wheel 41. The other end of each mandrel is equipped with a base, which is used to support the packaging materials and bottle neck structures. The packaging materials are sleeved on the base, and the bottle neck structures are installed on the top of the base.

[0081] The support assembly 5 includes a first support 21 and a second support 51. The first support 51 and the second support 52 are distributed in the circumferential direction of the spindle wheel 41, and the first support and the second support are respectively opposite to two adjacent spindles. A first jet component is installed on the first support, and a second jet component is installed on the second support. The first end of the first outer shell of the first jet component faces the direction of the corresponding spindle, and the first end of the second outer shell of the second jet component faces the direction of the corresponding spindle. When the first jet component is opposite to the spindle, the axis of the first outer shell coincides with the axis of the corresponding spindle. When the second jet component is opposite to the spindle, the axis of the second outer shell coincides with the axis of the corresponding spindle. The first jet component is movably mounted on the first support along the extension direction of the axis of the first outer shell. A first driving device is used to drive the first jet component to move on the first support along the axis of the first outer shell, and the second jet component is movably mounted on the second support along the extension direction of the axis of the second outer shell. A second driving device is used to drive the second jet component to move on the second support along the axis of the second outer shell. When the mandrel rotates, causing the packaging box at the top of the mandrel to align with the first and second jet components, the first jet component can move toward the packaging box and extend the first end of the first outer shell into the top of the packaging material to heat the connecting wall between the packaging material and the bottle neck structure. The second jet component can move toward the packaging box and extend the first end of the second outer shell into the top of the packaging material to heat the connecting wall between the packaging material and the bottle neck structure.

[0082] Based on the same design concept, this embodiment also provides a method for top heat treatment before sealing the top of a packaging box, using any of the top heat treatment devices provided in the above embodiments, refer to... Figure 1 , Figure 2 and Figure 4 As shown, the method includes:

[0083] First, align the packaging material 2 and bottle mouth structure 3 of the packaging box with the jet assembly 1, so that the first jet port 11 of the jet assembly 1 is opposite to the inner side of the side wall at the top of the packaging material 2, and the second jet port 12 of the jet assembly 1 is opposite to the outer side of the connecting wall 32 of the bottle mouth structure 3.

[0084] Then, the first heating is performed, so that the first jet nozzle 11, which is opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material 2, sprays hot air onto the area where the connecting longitudinal seam is located on the top of the packaging material 2, and the second jet nozzle 12 sprays hot air onto the connecting wall.

[0085] Next, after the first heating is completed, a second heating is performed, in which the first jet nozzle 11 sprays hot air onto the side wall of the top periphery of the packaging material 2, and the second jet nozzle 12 sprays hot air onto the connecting wall.

[0086] Specifically, in the above method, during the first heating, the gas pressure inside the jet assembly 1 is greater than or equal to 9 mbar to 13 mbar, the gas temperature inside the jet assembly 1 is 320℃ to 370℃, and the duration of the first heating is 450ms to 650ms; during the second heating, the gas pressure inside the jet assembly 1 is greater than or equal to 2 mbar to 4 mbar, the gas temperature inside the jet assembly 1 is 290℃ to 340℃, and the duration of the first heating is 450ms to 650ms. By reasonably allocating the temperature and heating time of the airflow during the two heating processes, the packaging material and the connecting wall can be heated to a better degree.

[0087] Furthermore, the interval between the first heating and the second heating is less than or equal to 1500 ms, after the first heating is completed and before the second heating begins. This ensures that the interval between the two heating cycles is not too long, which is beneficial for better heating of the packaging material and connecting walls.

[0088] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A top heat-sealing device for a packaging box before sealing, characterized in that, include: A jet assembly (1) includes a plurality of first jet nozzles (11) corresponding to the side wall of the top of the packaging material (2) of the packaging box, and a plurality of second jet nozzles (12) corresponding to the bottle opening structure (3) of the packaging box. The first jet nozzles (11) are located inside the side wall of the top of the packaging material (2) and opposite to the side wall of the top of the packaging material (2). The second jet nozzles (12) are located outside the connecting wall (32) of the bottle opening structure (3) and opposite to the connecting wall (32). When the jet assembly (1) is in a first working condition, the first jet nozzles (11) opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material (2) spray hot air onto the area where the connecting longitudinal seam is located on the top of the packaging material (2), and the second jet nozzles (12) spray hot air onto the connecting wall (32). When the jet assembly (1) is in the second operating condition, the first jet nozzle (11) sprays hot air onto the side wall of the top periphery of the packaging material (2), and the second jet nozzle (12) sprays hot air onto the connecting wall (32). An air supply assembly is used to supply hot air to the jet assembly (1), wherein the jet assembly (1) includes a first jet component (13) and a second jet component (14). The first jet component (13) includes: a first outer shell (131) and a first inner shell (132). The first outer shell (131) has a cylindrical structure and is sleeved on the outer periphery of the first inner shell (132). The first end of the first outer shell (131) is arranged in the same direction as the first end of the first inner shell (132), and the second end of the first outer shell (131) is arranged in the same direction as the second end of the first inner shell (132). A first ventilation cavity (133) is formed between the periphery of the first inner shell (132) and the first outer shell (131). The first end of the first outer shell (131) is sealed to the first end of the first inner shell (132), and a first air inlet (134) is formed between the second end of the first outer shell (131) and the second end of the first inner shell (132). A first vent (1311) communicating with the first ventilation cavity (133) is provided on the side wall of one side of the housing (131). The first vent (1311) is only used to be opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material (2), so that the first vent (1311) constitutes the first air outlet (11) of the air jet assembly (1) when it is in the first working condition. The first end of the first inner housing (132) forms a first concave structure (1321) with an opening. The first concave structure (1321) is used to accommodate the bottle mouth structure (3). A second vent (1322) distributed around the axis of the first outer housing (131) is provided on the edge of the first end of the first inner housing (132). The second vent (1322) constitutes the second air outlet (12) of the air jet assembly (1) when it is in the first working condition. The second jet component (14) includes: a second outer shell (141) and a second inner shell (142). The second outer shell (141) has a cylindrical structure and is fitted onto the outer periphery of the second inner shell (142). The first end of the second outer shell (141) is aligned with the first end of the second inner shell (142), and the second end of the second outer shell (141) is aligned with the second end of the second inner shell (142). A second ventilation cavity (143) is formed between the periphery of the second inner shell (142) and the second outer shell (141). The first end of the second outer shell (141) is sealed to the first end of the second inner shell (142), and a second air inlet (144) is formed between the second end of the second outer shell (141) and the second end of the second inner shell (142). A third vent (1411) is provided on the side wall of the second outer shell (141) and is distributed around the axis of the second outer shell (141) and communicates with the second vent cavity (143). The third vent (1411) is used to face the side wall of the top periphery of the packaging material (2) so that the third vent (1411) constitutes the first air outlet (11) of the air jet assembly (1) when it is in the second working condition. The first end of the second inner shell (142) forms a second concave structure (1421) with an opening. The second concave structure (1421) is used to accommodate the bottle mouth structure (3). The edge of the first end of the second inner shell (142) is provided with a fourth vent (1422) distributed around the axis of the second outer shell (141). The fourth vent (1422) constitutes the second air outlet (12) of the air jet assembly (1) when it is in the second working condition.

2. The top heating device before sealing the top of the packaging box according to claim 1, characterized in that, The first jet component (13) further includes a first connecting seat (135), the second end of the first outer shell (131) and the second end of the first inner shell (132) are connected to the first connecting seat (135), and the first connecting seat (135) is provided with a first air inlet (1351) communicating with the first ventilation chamber (133). The second jet component (14) further includes a second connecting seat (145), the second end of the second outer shell (141) and the second end of the second inner shell (142) are connected to the second connecting seat (145), and the second connecting seat (145) is provided with a second air inlet (1451) communicating with the second ventilation chamber (143).

3. The top heating device before sealing the top of the packaging box according to claim 1, characterized in that, When the first outer shell (131) is opposite to the side wall of the packaging material (2), the orthographic projection of the area where the first vent (1311) is located on the side wall of the packaging material (2) covers the connecting longitudinal seam on the side wall of the packaging material (2), and the first vent (1311) is located on both sides of the connecting longitudinal seam.

4. The top heating device before sealing the top of the packaging box according to claim 1, characterized in that, The sidewall of the first outer shell (131) is provided with at least two rows of first air vents (1311) arranged along the extension direction of the axis of the first outer shell (131), each row including a plurality of first air vents (1311), and the arrangement direction of the plurality of first air vents (1311) in each row is perpendicular to the axis of the first outer shell (131).

5. The top heating device before sealing the top of the packaging box according to claim 4, characterized in that, In at least two rows of the first vent holes (1311), the diameter of the first vent hole (1311) in the row closest to the first end of the first outer casing (131) is larger than the diameter of the first vent hole (1311) in the other rows.

6. The top heating device before sealing the top of the packaging box according to claim 4, characterized in that, In at least two rows of the first air outlet (1311), the first air outlet (1311) in each adjacent pair of rows are staggered.

7. The top heating device before sealing the top of the packaging box according to claim 1, characterized in that, Each sidewall of the first end edge portion of the first inner shell (132) is provided with at least two rows of second air vents (1322), each row including multiple second air vents (1322), and the arrangement direction of the multiple second air vents (1322) in each row is perpendicular to the axis of the first outer shell (131).

8. The top heating device before sealing the top of the packaging box according to claim 7, characterized in that, In at least two rows of the second air outlets (1322), the second air outlets (1322) in each adjacent pair of rows are staggered.

9. The top heating device for sealing the top of the packaging box according to any one of claims 1-8, characterized in that, Each side wall of the second outer shell (141) is provided with at least two rows of the third vent holes (1411) arranged along the extension direction of the axis of the second outer shell (141), each row including multiple third vent holes (1411), and the arrangement direction of the multiple third vent holes (1411) in each row is perpendicular to the axis of the second outer shell (141).

10. The top heating device before sealing the top of the packaging box according to claim 9, characterized in that, Of the at least two rows of the third vent (1411), the diameter of the third vent (1411) in the row closest to the first end of the second outer casing (141) is larger than the diameter of the third vent (1411) in the other rows.

11. The top heating device before sealing the top of the packaging box according to claim 9, characterized in that, In at least two rows of the third vent (1411), the third vents (1411) in each adjacent pair of rows are staggered.

12. The top heating device before sealing the top of the packaging box according to claim 9, characterized in that, A connecting ridge (1412) is formed between each pair of adjacent sidewalls in the second outer shell (141). The extending direction of the connecting ridge (1412) is parallel to the extending direction of the axis of the second outer shell (141). A plurality of through holes (1413) are provided on the connecting ridge (1412) arranged sequentially along the extending direction of the connecting ridge (1412). The through holes (1413) are connected to the second ventilation cavity (143).

13. The top heating device before sealing the top of the packaging box according to claim 12, characterized in that, The diameter of the through hole (1413) is larger than the diameter of the third vent (1411) in a row near the second end of the second outer casing (141).

14. The top heat-generating device before sealing the top of the packaging box according to claim 12, characterized in that, Each sidewall of the second outer casing (141) has an oblique through hole (1414) near the edge of the connecting edge (1412). The oblique through hole (1414) is located on the side of the third vent (1411) facing the first end of the second outer casing (141). In a cross section perpendicular to the axis of the second outer casing (141), the two sidewalls of the second outer casing (141) connected to the same connecting edge (1412) are divided into a first sidewall and a second sidewall. The axis of the oblique through hole (1414) on the first sidewall intersects the extension direction of the second sidewall on the side of the first sidewall away from the second sidewall. The axis of the oblique through hole (1414) on the second sidewall intersects the extension direction of the first sidewall on the side of the second sidewall away from the first sidewall.

15. The top heating device for sealing the top of a packaging box according to any one of claims 1-8, characterized in that, Each sidewall of the edge portion of the first end of the second inner shell (142) is provided with at least two rows of the fourth vent holes (1422), each row including multiple fourth vent holes (1422), and the arrangement direction of the fourth vent holes (1422) in each row is perpendicular to the axis of the second outer shell (141).

16. The top heating device for sealing the top of the packaging box according to claim 15, characterized in that, In at least two rows of the fourth vent (1422), the fourth vents (1422) in each adjacent pair of rows are staggered.

17. The top heating device before sealing the top of the packaging box according to claim 1, characterized in that, The jet assembly (1) further includes: a third jet component, the third jet component comprising: A third outer shell (151) and a third inner shell (152) are provided. The third outer shell (151) has a cylindrical structure and is fitted onto the outer periphery of the third inner shell (152). The first end of the third outer shell (151) is aligned with the first end of the third inner shell (152), and the second end of the third outer shell (151) is aligned with the second end of the third inner shell (152). A third ventilation cavity (153) is formed between the periphery of the third inner shell (152) and the third outer shell (151). The first end of the third outer shell (151) is sealed to the first end of the third inner shell (152). A third air inlet (154) is formed between the second end of the outer shell (151) and the second end of the third inner shell (152); a fifth air outlet (1511) is provided on the side wall of the third outer shell (151) around the axis of the third outer shell (151) and communicating with the third ventilation cavity (153); a third concave structure (1521) with an open opening is formed at the first end of the third inner shell (152), the third concave structure (1521) is used to accommodate the bottle mouth structure (3), and a sixth air outlet (1522) is provided on the edge of the first end of the third inner shell (152) around the axis of the third outer shell (151). A shielding piece (155) is fitted onto the outer periphery of the third outer shell (151). The shielding piece (155) is movably mounted on the third outer shell (151) along the extension direction of the axis of the third outer shell (151). The shielding piece (155) has a notch (1551) opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material (2). When the shielding piece (155) is in the first shielding position, part of the fifth vent (1511) is exposed at the notch (1551), and the shielding piece (155) covers the remaining fifth vents (1511). When the shielding piece (155) is in the open position, the shielding piece (155) avoids all the fifth vents (1511) so that all the fifth vents (1511) are exposed.

18. A packaging box forming equipment, characterized in that, Includes a top heat treatment device for sealing the top of the packaging box as described in any one of claims 1-17.

19. A method for heat-heating the top of a packaging box before sealing, using the heat-heating device for the top of a packaging box as described in any one of claims 1-17, characterized in that, The method includes: Align the packaging material (2) and bottle neck structure (3) of the packaging box with the jet assembly (1), so that the first jet port (11) of the jet assembly (1) is opposite to the inner side of the side wall of the top of the packaging material (2), and the second jet port (12) of the jet assembly (1) is opposite to the outer side of the connecting wall (32) of the bottle neck structure (3). The first heating is performed so that the first jet nozzle (11) opposite to the area where the connecting longitudinal seam is located on the top periphery of the packaging material (2) sprays hot air onto the area where the connecting longitudinal seam is located on the top of the packaging material (2), and the second jet nozzle (12) sprays hot air onto the connecting wall (32). After the first heating is completed, a second heating is performed, in which the first jet nozzle (11) sprays hot air onto the side wall of the top periphery of the packaging material (2), and the second jet nozzle (12) sprays hot air onto the connecting wall (32).

20. The method for heat-treating the top of a packaging box before sealing according to claim 19, characterized in that, During the first heating, the gas pressure inside the jet assembly (1) is 9 mbar to 13 mbar, the gas temperature inside the jet assembly (1) is 320°C to 370°C, and the duration of the first heating is 450 ms to 650 ms. During the second heating, the gas pressure inside the jet assembly (1) is 2 mbar to 4 mbar, and the gas temperature inside the jet assembly (1) is 290°C to 340°C.

21. The method for heat-treating the top of a packaging box before sealing according to claim 19 or 20, characterized in that, After the first heating is completed and before the second heating begins, the interval between the first heating and the second heating is less than or equal to 1500ms.

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