PE bag self-adjusting heat sealing mechanism

Abstract

The utility model provides a PE bag self-adjusting heat sealing mechanism which comprises a frame assembly and a power assembly fixed to the frame assembly, the frame assembly comprises a heat sealing frame and a fixing base fixed to the outer wall of the heat sealing frame, and the PE bag self-adjusting heat sealing mechanism further comprises a heat sealing assembly and a transmission assembly. The heat sealing assembly comprises a first heat sealing block, a second heat sealing block arranged opposite to the first heat sealing block, a bearing block connected to the side, opposite to the first heat sealing block, of the second heat sealing block and a connecting block arranged at an interval with the bearing block, a spring is arranged between the bearing block and the connecting block, and sliding connection holes are formed in the two ends of the connecting block correspondingly. The two ends of the bearing block are connected with linkage shafts which are matched with the sliding connection holes in a sliding connection mode, the side, facing the heat sealing frame, of the connecting block is provided with locking nuts which are connected to the linkage shafts in a screwed mode, and heating pipes are arranged in the first heat sealing block and the second heat sealing block correspondingly. The power assembly controls the first heat sealing block and the second heat sealing block to move oppositely or reversely through the transmission assembly, and heat sealing of the PE bag is achieved. The sealing device is good in sealing effect and wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging equipment, in particular to a self-regulating heat-sealing mechanism for a PE bag. Background Art

[0002] During the heat sealing process of PE bags, due to the different thicknesses of the straight bags and M bags, when the M bags are sealed with ordinary heat sealing mechanisms, uneven force will occur when the heating blocks are engaged, resulting in poor heat sealing effects, which in turn limits the scope of application of existing heat sealing mechanisms. Utility Model Content

[0003] Based on the above problems, the purpose of the utility model is to provide a self-regulating heat sealing mechanism for PE bags with good sealing effect and wide application range.

[0004] In view of the above problems, the following technical solutions are provided: a self-adjusting heat-sealing mechanism for PE bags, comprising a frame assembly and a power assembly fixed on the frame assembly, the frame assembly comprising a heat-sealing frame and a fixing seat fixed on the outer wall of the heat-sealing frame, a heat-sealing assembly and a transmission assembly, the heat-sealing assembly comprising a first heat-sealing block, a second heat-sealing block arranged opposite to the first heat-sealing block, a receiving block connected to a side of the second heat-sealing block opposite to the first heat-sealing block, and a connecting block arranged at intervals from the receiving block, a spring is provided between the receiving block and the connecting block, sliding holes are provided at both ends of the connecting block, linkage shafts slidingly matched relative to the sliding holes are connected at both ends of the receiving block, a locking nut screwed on the linkage shaft is provided on the side of the connecting block facing the heat-sealing frame, heating tubes are provided in the first heat-sealing block and the second heat-sealing block, and the power assembly controls the first heat-sealing block and the second heat-sealing block to move toward or in the opposite direction through the transmission assembly to achieve heat sealing of the PE bag.

[0005] In the above structure, when the PE bag is transported to the heat-sealing mechanism, the power assembly controls the first heat-sealing block and the second heat-sealing block to move toward each other through the transmission assembly, and clamps and heat-seals the PE bag mouth. After the heat-sealing is completed, the power assembly controls the first heat-sealing block and the second heat-sealing block to move in the opposite direction through the transmission assembly, loosens the PE bag, and facilitates the PE bag to be transported to the next station. By setting a spring, when the first heat-sealing block and the second heat-sealing block are clamped, the receiving block can drive the second heat-sealing block to perform adaptive displacement adjustment, so that the first heat-sealing block and the second heat-sealing block are more closely fitted when clamping the PE bag, thereby improving the sealing effect and sealing efficiency of the utility model, reducing the scrap rate, and being able to perform adaptive adjustment according to different PE bags, expanding the scope of application of the utility model. Through the sliding cooperation between the linkage shaft and the sliding hole, the stability of the receiving block driving the second heat-sealing block to move back and forth relative to the connecting block can be improved, thereby improving the reliability of the heat-sealing assembly. By setting a locking nut, the linkage shaft can be limited, the stability of the linkage shaft installation is improved, and the preload force of the spring between the receiving block and the connecting block can be adjusted, so that the utility model can be applied to different usage scenarios, expanding the scope of application of the utility model. By setting a heating pipe, the first heat sealing block and the second heat sealing block can be heated, thereby achieving heat sealing of the PE bag mouth.

[0006] The utility model is further configured that the springs are provided with two groups, which are respectively located at two ends of the receiving block.

[0007] The above structure can improve the stability of the receiving block driving the second heat sealing block to move, and can better self-adapt and adjust, thereby improving the reliability of the utility model.

[0008] The utility model is further configured that a mounting hole abutting against one end of the spring is provided on the receiving block, and a positioning hole abutting against the other end of the spring is provided at a position corresponding to the mounting hole on the connecting block.

[0009] The above structure can facilitate the installation of the spring and improve the stability of the spring after installation, thereby improving the reliability of the utility model.

[0010] The utility model is further configured as follows: the power assembly includes a driving cylinder, a rotating seat, a pivot shaft, a connecting plate and a connecting rod; one end of the driving cylinder is connected and fixed to the fixed seat, and the other end passes through the heat sealing frame and is connected to one end of the rotating seat through a fisheye joint; one end of the pivot shaft is connected to the middle part of the rotating seat through a bearing, and the other end is fixed to the heat sealing frame; the connecting rod is connected to the side of the rotating seat opposite to the driving cylinder through a fisheye joint; the connecting plate is connected to one end of the rotating seat opposite to the driving cylinder and is arranged on the same side as the connecting rod; the transmission assembly includes a first transmission shaft, a second transmission shaft, a first transmission plate and a second transmission plate; the first transmission shaft and the second transmission shaft are arranged upper and lower The first transmission plate is arranged to be mounted on the first transmission shaft, and one end of the first transmission plate is connected to one end of the connecting rod relatively rotating seat by a fisheye joint, and the other end is mounted on the second transmission shaft through a first shaft sleeve. The first transmission plate is mounted on one side of the first transmission shaft and is fixed by screws. The second transmission plate is mounted on the second transmission shaft, one end of the second transmission plate is pivotally matched with one end of the connecting plate relatively rotating seat, and the other end is mounted on the first transmission shaft through a second shaft sleeve. The second transmission plate is mounted on one side of the second transmission shaft and is fixed by screws. The first heat sealing block is connected to the outer end of the first transmission shaft, and the connecting block is connected to the outer end of the second transmission shaft.

[0011] In the above structure, the driving cylinder controls its cylinder shaft to be retracted into the cylinder, so that the rotating seat swings relative to the pivot shaft, the first transmission shaft is displaced toward one side of the fixed seat through the connecting rod connected to one end of the rotating seat, and the second transmission shaft is displaced toward the outer end of the heat sealing frame through the connecting plate connected to the other end of the rotating seat, thereby driving the first heat sealing plate and the second heat sealing plate to displace toward each other, thereby achieving heat sealing of the PE bag; after the heat sealing of the PE bag is completed, the driving cylinder controls its cylinder shaft to extend, so that the rotating seat swings in the opposite direction, the first transmission shaft is displaced toward the outer end of the heat sealing frame through the connecting rod connected to one end of the rotating seat, and the second transmission shaft is displaced toward one side of the fixed seat through the connecting plate connected to the other end of the rotating seat, thereby driving the first heat sealing plate and the second heat sealing plate to displace in the opposite direction, thereby achieving the loosening of the PE bag. By setting the pivot shaft, the stability of the swing of the rotating seat can be improved, thereby improving the stability of the overall structure of the power assembly. By setting the first transmission plate, it is convenient for the first transmission shaft to be connected to the connecting rod, thereby achieving the linkage between the first transmission shaft and the connecting rod, thereby improving the stability of the structure of the utility model. The second transmission plate can be provided to facilitate the connection between the second transmission shaft and the connecting plate, thereby realizing the linkage between the second transmission shaft and the connecting plate, and improving the stability of the structure of the utility model. The first transmission plate and the second transmission plate are respectively connected to the second transmission shaft and the first transmission shaft through the sleeve, which can prevent the second transmission shaft from affecting the first transmission plate when it is displaced, and the first transmission shaft from affecting the second transmission plate when it is displaced, thereby improving the stability of the connection assembly and improving the reliability of the utility model.

[0012] The utility model is further configured such that the outer end of the first transmission shaft is connected to a connecting seat, and the first heat sealing block is fixed to a side of the bottom end of the connecting seat facing the heat sealing frame.

[0013] In the above structure, by providing the connecting seat, the first heat sealing block can be easily installed on the same horizontal plane as the second heat sealing block, so that the first heat sealing block and the second heat sealing block are clamped together, thereby improving the reliability of the utility model.

[0014] The utility model is further configured such that the connecting seat includes a side plate and an upper clamping plate, the upper clamping plate and the side plate are respectively located on the upper and lower sides of the end of the first transmission shaft, the two ends of the upper clamping plate are connected and fixed to the side plate by screws, and the first heat sealing block is fixed to the side plate.

[0015] The above structure can facilitate the disassembly and assembly of the connecting seat, and further facilitate the disassembly and assembly of the first heat sealing block, thereby improving the convenience of disassembly and assembly of the utility model.

[0016] The utility model is further configured that a ridge groove is provided on one side of the first heat sealing block facing the second heat sealing block, and a plurality of the ridge grooves are provided in a height direction relative to the first heat sealing block.

[0017] The above structure can improve the sealing and firmness of the PE bag mouth after heat sealing, thereby improving the heat sealing effect of the utility model.

[0018] The utility model is further configured such that a silicone strip is inserted into a side of the second heat sealing block facing the first heat sealing block.

[0019] By adopting the above structure, the first heat-sealing block and the second heat-sealing block can clamp the PE bag opening tightly, thereby improving the heat-sealing effect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the utility model is shown in FIG. Figure 1 .

[0021] Figure 2 The structure of the utility model is shown in FIG. Figure 2 .

[0022] Figure 3 It is a schematic diagram of the top structure of the utility model.

[0023] Figure 4 It is a side structural schematic diagram of the utility model.

[0024] Figure 5 It is a structural schematic diagram of the main structure in the utility model.

[0025] Figure 6 It is a structural schematic diagram of the transmission component in the utility model.

[0026] Meaning of the numbers in the figure: 1-frame assembly; 2-power assembly; 11-heat sealing frame; 12-fixed seat; 3-heat sealing assembly; 4-transmission assembly; 31-first heat sealing block; 32-second heat sealing block; 33-receiving block; 34-connecting block; 5-spring; 341-sliding hole; 331-linkage shaft; 342-locking nut; 6-heating tube; 332-mounting hole; 343-positioning hole; 21-driving cylinder; 22-rotating seat; 23-pivot shaft; 24-connecting plate; 25-connecting rod; 41-first transmission shaft; 42-second transmission shaft; 43-first transmission plate; 44-second transmission plate; 431-first sleeve; 432-second sleeve; 7-connecting seat; 71-side plate; 72-upper clamping plate; 311-rib groove; 8-silicone strip. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] The driving cylinder, fisheye joint, bearing and sleeve mentioned in the article all adopt existing conventional technologies.

[0029] like Figures 1 to 6 The self-adjusting heat-sealing mechanism for PE bags shown in the figure comprises a frame assembly 1 and a power assembly 2 fixed on the frame assembly 1, the frame assembly 1 comprises a heat-sealing frame 11 and a fixing seat 12 fixed on the outer wall of the heat-sealing frame 11, and further comprises a heat-sealing assembly 3 and a transmission assembly 4, the heat-sealing assembly 3 comprises a first heat-sealing block 31, a second heat-sealing block 32 arranged opposite to the first heat-sealing block 31, a receiving block 33 connected to a side of the second heat-sealing block 32 opposite to the first heat-sealing block 31, and a connecting block 34 spaced apart from the receiving block 33, the receiving block A spring 5 is provided between 33 and the connecting block 34, sliding holes 341 are provided at both ends of the connecting block 34, and linkage shafts 331 slidingly matched with the sliding holes 341 are connected at both ends of the receiving block 33. A locking nut 342 screwed on the linkage shaft 331 is provided on the side of the connecting block 34 facing the heat sealing frame 11. A heating tube 6 is provided in the first heat sealing block 31 and the second heat sealing block 32. The power component 2 controls the first heat sealing block 31 and the second heat sealing block 32 to move toward or in the opposite direction through the transmission component 4 to achieve heat sealing of the PE bag.

[0030] In the above structure, when the PE bag is transported to the heat sealing mechanism, the power assembly 2 controls the first heat sealing block 31 and the second heat sealing block 32 to move toward each other through the transmission assembly 4, and clamps and heat-seals the PE bag mouth. After the heat sealing is completed, the power assembly 2 controls the first heat sealing block 31 and the second heat sealing block 32 to move in the opposite direction through the transmission assembly 4, loosens the PE bag, and facilitates the PE bag to be transported to the next station. By setting the spring 5, when the first heat sealing block 31 and the second heat sealing block 32 are clamped, the receiving block 33 can drive the second heat sealing block 32 to perform adaptive displacement adjustment, so that the first heat sealing block 31 and the second heat sealing block 32 are more closely fitted when clamping the PE bag, thereby improving the sealing effect and sealing efficiency of the utility model, reducing the scrap rate, and being able to perform adaptive adjustment according to different PE bags, expanding the scope of application of the utility model. By slidingly cooperating with the linkage shaft 331 and the sliding hole 341, the stability of the receiving block 33 driving the second heat sealing block 32 to move back and forth relative to the connecting block 34 can be improved, thereby improving the reliability of the heat sealing assembly 3. By setting the locking nut 342, the linkage shaft 331 can be limited, the stability of the installation of the linkage shaft 331 can be improved, and the preload force of the spring 5 between the receiving block 33 and the connecting block 34 can be adjusted, thereby making the utility model applicable to different usage scenarios and expanding the scope of application of the utility model. By setting the heating tube 6, the first heat sealing block 31 and the second heat sealing block 32 can be heated, thereby achieving heat sealing of the PE bag mouth.

[0031] In this embodiment, the springs 5 ​​are provided in two groups, which are respectively located at two ends of the receiving block 33 .

[0032] The above structure can improve the stability of the receiving block 33 driving the second heat sealing block 32 to move, and can better self-adapt and adjust, thereby improving the reliability of the utility model.

[0033] In this embodiment, a mounting hole 332 abutting against one end of the spring 5 is formed on the receiving block 33 , and a positioning hole 343 abutting against the other end of the spring 5 is formed on the connecting block 34 at a position corresponding to the mounting hole 332 .

[0034] The above structure can facilitate the installation of the spring 5 and improve the stability of the spring 5 after installation, thereby improving the reliability of the utility model.

[0035] In this embodiment, the power assembly 2 includes a driving cylinder 21, a rotating seat 22, a pivot shaft 23, a connecting plate 24 and a connecting rod 25. One end of the driving cylinder 21 is connected and fixed to the fixed seat 12, and the other end passes through the heat sealing frame 11 and is connected to one end of the rotating seat 22 through a fisheye joint. One end of the pivot shaft 23 is connected to the middle of the rotating seat 22 through a bearing, and the other end is fixed to the heat sealing frame 11. The connecting rod 25 is connected to the side of the rotating seat 22 opposite to the driving cylinder 21 through a fisheye joint. The connecting plate 24 is connected to one end of the rotating seat 22 opposite to the driving cylinder 21, and is arranged on the same side as the connecting rod 25. The transmission assembly 4 includes a first transmission shaft 41, a second transmission shaft 42, a first transmission plate 43 and a second transmission plate 44. The first transmission shaft 41 and the second transmission shaft 42 are arranged upper and lower. The heat sealing frame 11 is arranged in the same direction relative to the driving cylinder 21, and the first transmission plate 43 is sleeved on the first transmission shaft 41, one end of which is connected to one end of the rotating seat 22 of the connecting rod 25 relative to the first transmission shaft 41 through a fisheye joint, and the other end is sleeved on the second transmission shaft 42 through a first shaft sleeve 431, the first transmission plate 43 is sleeved on one side of the first transmission shaft 41 and fixed by screws, the second transmission plate 44 is sleeved on the second transmission shaft 42, one end of which is pivotally matched with one end of the rotating seat 22 of the connecting plate 24 relative to the first transmission shaft 41, and the other end is sleeved on the first transmission shaft 41 through a second shaft sleeve 432, the second transmission plate 44 is sleeved on one side of the second transmission shaft 42 and fixed by screws, the first heat sealing block 31 is connected to the outer end of the first transmission shaft 41, and the connecting block 34 is connected to the outer end of the second transmission shaft 42.

[0036] In the above structure, the driving cylinder 21 controls its cylinder shaft to be retracted into the cylinder, so that the rotating seat 22 swings relative to the pivot shaft 23, the first transmission shaft 41 is displaced toward one side of the fixed seat 12 through the connecting rod 25 connected to one end of the rotating seat 22, and the second transmission shaft 42 is displaced toward the outer end of the heat sealing frame 11 through the connecting plate 24 connected to the other end of the rotating seat 22, thereby driving the first heat sealing plate and the second heat sealing plate to displace toward each other, thereby achieving heat sealing of the PE bag; after the heat sealing of the PE bag is completed, the driving cylinder 21 controls its cylinder shaft to extend, so that the rotating seat 22 swings in the opposite direction, the first transmission shaft 41 is displaced toward the outer end of the heat sealing frame 11 through the connecting rod 25 connected to one end of the rotating seat 22, and the second transmission shaft 42 is displaced toward one side of the fixed seat 12 through the connecting plate 24 connected to the other end of the rotating seat 22, thereby driving the first heat sealing plate and the second heat sealing plate to displace in the opposite direction, thereby achieving the loosening of the PE bag. By setting the pivot shaft 23, the swinging stability of the rotating seat 22 can be improved, thereby improving the stability of the overall structure of the power assembly 2. By providing the first transmission plate 43, it is convenient to connect the first transmission shaft 41 with the connecting rod 25, so as to realize the linkage between the first transmission shaft 41 and the connecting rod 25, and improve the stability of the structure of the utility model. By providing the second transmission plate 44, it is convenient to connect the second transmission shaft 42 with the connecting plate 24, so as to realize the linkage between the second transmission shaft 42 and the connecting plate 24, and improve the stability of the structure of the utility model. The first transmission plate 43 and the second transmission plate 44 are respectively connected to the second transmission shaft 42 and the first transmission shaft 41 through the sleeve, which can avoid the second transmission shaft 42 from affecting the first transmission plate 43 when it is displaced, and the first transmission shaft 41 from affecting the second transmission plate 44 when it is displaced, thereby improving the stability of the connection assembly and improving the reliability of the utility model.

[0037] In this embodiment, the outer end of the first transmission shaft 41 is connected to a connecting seat 7 , and the first heat sealing block 31 is fixed to a side of the bottom end of the connecting seat 7 facing the heat sealing frame 11 .

[0038] In the above structure, by providing the connecting seat 7, the first heat sealing block 31 can be easily installed on the same horizontal plane as the second heat sealing block 32, so that the first heat sealing block 31 and the second heat sealing block 32 are clamped together, thereby improving the reliability of the utility model.

[0039] In this embodiment, the connecting seat 7 includes a side plate 71 and an upper clamping plate 72. The upper clamping plate 72 and the side plate 71 are respectively located on the upper and lower sides of the end of the first transmission shaft 41. The two ends of the upper clamping plate 72 are connected and fixed to the side plate 71 by screws, and the first heat sealing block 31 is fixed on the side plate 71.

[0040] The above structure can facilitate the disassembly and assembly of the connecting seat 7, and further facilitate the disassembly and assembly of the first heat sealing block 31, thereby improving the convenience of disassembly and assembly of the utility model.

[0041] In this embodiment, a ridge groove 311 is formed on one side of the first heat sealing block 31 facing the second heat sealing block 32 , and a plurality of ridge grooves 311 are provided in a height direction relative to the first heat sealing block 31 .

[0042] The above structure can improve the sealing and firmness of the PE bag mouth after heat sealing, thereby improving the heat sealing effect of the utility model.

[0043] In this embodiment, a silicone strip 8 is inserted into a side of the second heat sealing block 32 facing the first heat sealing block 31 .

[0044] With the above structure, the first heat-sealing block 31 and the second heat-sealing block 32 clamp the PE bag mouth tightly, thereby improving the heat-sealing effect of the utility model.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. A self-adjusting heat-sealing mechanism for PE bags, comprising a frame assembly and a power assembly fixed on the frame assembly, wherein the frame assembly comprises a heat-sealing frame and a fixing seat fixed on the outer wall of the heat-sealing frame, characterized in that: It also includes a heat sealing component and a transmission component, the heat sealing component includes a first heat sealing block, a second heat sealing block arranged opposite to the first heat sealing block, a receiving block connected to the second heat sealing block on a side opposite to the first heat sealing block, and a connecting block arranged at a distance from the receiving block, a spring is provided between the receiving block and the connecting block, sliding holes are provided at both ends of the connecting block, and linkage shafts that slide relative to the sliding holes are connected at both ends of the receiving block, a locking nut screwed on the linkage shaft is provided on the side of the connecting block facing the heat sealing frame, heating tubes are provided in the first heat sealing block and the second heat sealing block, and the power component controls the first heat sealing block and the second heat sealing block to move toward or in the opposite direction through the transmission component to achieve heat sealing of the PE bag.

2. A PE bag self-adjusting heat sealing mechanism according to claim 1, characterized in that: The springs are provided in two groups, which are respectively located at two ends of the receiving block.

3. A PE bag self-adjusting heat sealing mechanism according to claim 2, characterized in that: The receiving block is provided with a mounting hole abutting against one end of the spring, and the connecting block is provided with a positioning hole abutting against the other end of the spring at a position corresponding to the mounting hole.

4. A PE bag self-adjusting heat sealing mechanism according to claim 1, characterized in that: The power assembly includes a driving cylinder, a rotating seat, a pivot shaft, a connecting plate and a connecting rod. One end of the driving cylinder is connected and fixed to the fixed seat, and the other end passes through the heat sealing frame and is connected to one end of the rotating seat through a fisheye joint. One end of the pivot shaft is connected to the middle part of the rotating seat through a bearing, and the other end is fixed to the heat sealing frame. The connecting rod is connected to the side of the rotating seat opposite to the driving cylinder through a fisheye joint. The connecting plate is connected to one end of the rotating seat opposite to the driving cylinder and is arranged on the same side as the connecting rod. The transmission assembly includes a first transmission shaft, a second transmission shaft, a first transmission plate and a second transmission plate. The first transmission shaft and the second transmission shaft are arranged up and down and drive relative to each other The cylinder passes through the heat sealing frame in the same direction, the first transmission plate is sleeved on the first transmission shaft, one end of which is connected to one end of the connecting rod relative to the rotating seat through a fisheye joint, and the other end is sleeved on the second transmission shaft through a first shaft sleeve, the first transmission plate is sleeved on one side of the first transmission shaft and fixed by screws, the second transmission plate is sleeved on the second transmission shaft, one end of which is pivotally matched with one end of the connecting plate relative to the rotating seat, and the other end is sleeved on the first transmission shaft through a second shaft sleeve, the second transmission plate is sleeved on one side of the second transmission shaft and fixed by screws, the first heat sealing block is connected to the outer end of the first transmission shaft, and the connecting block is connected to the outer end of the second transmission shaft.

5. A PE bag self-adjusting heat sealing mechanism according to claim 4, characterized in that: The outer end of the first transmission shaft is connected with a connecting seat, and the first heat sealing block is fixed to a side of the bottom end of the connecting seat facing the heat sealing frame.

6. A PE bag self-adjusting heat sealing mechanism according to claim 5, characterized in that: The connecting seat includes a side plate and an upper clamping plate, the upper clamping plate and the side plate are respectively located at the upper and lower sides of the end of the first transmission shaft, the two ends of the upper clamping plate are connected and fixed to the side plate by screws, and the first heat sealing block is fixed to the side plate.

7. A PE bag self-adjusting heat sealing mechanism according to claim 1, characterized in that: A ridge groove is provided on one side of the first heat sealing block facing the second heat sealing block, and a plurality of the ridge grooves are arranged in a height direction relative to the first heat sealing block.

8. A PE bag self-adjusting heat sealing mechanism according to claim 7, characterized in that: A silicone strip is inserted into a side of the second heat-sealing block facing the first heat-sealing block.

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