A method to improve the quality of heat-sealed seals

Abstract

This invention relates to the field of heat-sealing technology for plastic bags, and particularly to a method for improving the quality of heat-sealing. The method includes a pressing assembly comprising a first pressing assembly and a second pressing assembly that can be approached and moved away from each other. When the first and second pressing assemblies are close together, a second heating assembly cuts the plastic bag, and the first heating assembly presses both sides of the cut and performs heat sealing. The second heating assembly is fixed on a first pressing base, and a second heating wire is disposed on a thermal cutting base. A second thermally conductive diaphragm covers the outside of the second heating wire, forming a knife-edge shape. Compared with existing technologies, this invention's method for improving the quality of heat-sealing ensures complete heat sealing on both sides of the cut when the plastic bag is cut, preventing sticking to the equipment, improving the quality of heat-sealing, making automated plastic bag packaging operations more stable and reliable, facilitating continuous equipment operation, reducing maintenance costs, and enhancing the user experience.

Description

[Technical Field]

[0001] This invention relates to the field of hot melt sealing technology for plastic bags, and in particular to a method for improving the quality of hot melt sealing. [Background Technology]

[0002] In existing continuous automatic waste baling equipment, tubular plastic bags are typically used. During heat sealing and heat cutting, an integrated heat sealing and heat cutting heating assembly is usually employed, which can easily lead to the following problems:

[0003] 1. Heat transfer occurs between the heat-cutting structure and the heat-sealing structure, making it difficult to control the temperature precisely. It is hard to simultaneously meet the heat-sealing temperature and the heat-cutting temperature, which can easily lead to overheating or insufficient heating of the plastic bag.

[0004] 2. Heat-cutting plastic bags requires melting the bag, necessitating sufficiently high temperatures; simultaneously, it's crucial that the plastic bag doesn't stick to the heating wire, requiring the addition of a non-stick diaphragm. Currently, the mainstream method in the market is:

[0005] a. The heating wire directly heats and melts the plastic bag. The extremely high temperature of the heating wire can cause the plastic bag to stick to the heating wire, requiring frequent cleaning to ensure normal use. In addition, because the heating wire needs to be relatively thin and long to have sufficient resistance to generate enough heat, its thin and long characteristics result in the heating wire lacking sufficient diameter and height to cut the plastic bag.

[0006] b. Combination of heating wire and heat-conducting component with blade-like characteristics: Some commercially available solutions combine heating wire with a metal heat-conducting component with blade-like characteristics for heat sealing and cutting. This method overcomes the drawback of insufficient diameter and height of the heating wire. However, because metal is conductive, an insulating film needs to be added between the metal heat-conducting component and the heating wire. This causes the temperature sensor to be further away from the heated section of the plastic bag, increasing the difficulty of temperature control and resulting in poor heat sealing and cutting effects. Furthermore, the metal heat-conducting component absorbs and dissipates a large amount of heat, which can easily cause the heating wire temperature to fall below the ideal cutting temperature, leading to cutting failure. [Summary of the Invention]

[0007] To overcome the above problems, this invention proposes a method for improving the quality of hot melt sealing, which can effectively solve the above problems.

[0008] The present invention provides a technical solution to the above-mentioned technical problems: a method for improving the quality of heat-sealing, comprising a pressing assembly, wherein the pressing assembly includes a first pressing assembly and a second pressing assembly that can be approached and moved away from each other, the first pressing assembly and the second pressing assembly being used to close, heat-seal, and cut a plastic bag when they are close together; the first pressing assembly includes a first pressing base, a first heating assembly, and a second heating assembly; the second pressing assembly includes a second pressing base and a buffer device; the first heating assembly is connected to the first pressing base and is located on both sides of the second heating assembly. The first heating component and the second heating component are set independently and do not interfere with each other. The second heating component is used to cut the plastic bag, and the first heating component is used to heat seal the plastic bag on both sides of the cut. When the first pressing component and the second pressing component come together, the second heating component cuts the plastic bag, and the first heating component squeezes the two sides of the cut and heat seals it. The second heating component is fixed on the first pressing base. The second heating component includes a thermal cutting base, a second heating wire, and a second thermally conductive diaphragm. The second heating wire is disposed on the thermal cutting base, and the second thermally conductive diaphragm covers the outside of the second heating wire to form a knife edge.

[0009] Preferably, the first heating component and the second heating component have different temperature settings, with the temperature of the second heating component being higher than that of the first heating component.

[0010] Preferably, the first heating component includes a first heating wire and a first thermally conductive membrane; the first heating wire has two heating zones a and b parallel or nearly parallel to the first direction in a first direction; in a second direction, the second heating component is located between the heating zones a and b; in a third direction, when the first pressing component and the second pressing component are closed and pressed together, the second heating component is higher than the heating zones a and b.

[0011] Preferably, in the third direction, the first thermally conductive membrane is positioned above the first heating wire, and the second thermally conductive membrane is positioned above the second heating wire;

[0012] The buffer device is fixed on the second pressing base. The buffer device includes a buffer sheet and a third thermally conductive membrane. The buffer sheet is located below the second pressing base in a third direction, and the third thermally conductive membrane is located below the buffer sheet.

[0013] Preferably, a buffer elastic element and a heat assembly guide structure are further provided between the first pressing base and the first heating component, thereby enabling relative positional displacement between the first and second heating components. When the first and second pressing components approach and press, the second heating component cuts the plastic bag, and the first heating component presses both sides of the cut and moves backward during the pressing process. When the first and second pressing components approach, the first heating component is forced to move towards the first pressing base, at which time the buffer elastic element provides elastic support. The first heating component is fixed to the first pressing base in a smoothly movable manner. When the first and second pressing components approach or move away, the first heating component and the first pressing base also move closer or further apart through sliding.

[0014] Preferably, in the third direction, the upper end of the thermal cutting base has a linear groove for limiting and fixing the second heating wire.

[0015] Preferably, the linear groove at the upper end of the thermal cutting base is provided with an NTC mounting hole for mounting a temperature sensor.

[0016] Preferably, a heat-resistant protective film is provided between the thermal cutting base and the second heating wire.

[0017] Preferably, the first heating wire and the second heating wire are respectively connected to independently controllable heating circuits; the first pressing assembly and the second heating assembly respectively include a first temperature sensor and a second temperature sensor.

[0018] Preferably, the second pressing assembly further includes a third heating wire, which has a heating area c and a heating area d parallel or nearly parallel to the first direction. When the first pressing assembly and the second pressing assembly come together, the heating area c and the heating area d correspond to the heating area a and the heating area b, respectively.

[0019] The first, second, and third thermally conductive membranes of this invention are made of materials with non-stick properties, preferably Teflon materials.

[0020] Compared with the prior art, the method of the present invention for improving the quality of hot melt sealing has the following beneficial effects:

[0021] 1. It blocks heat transfer from the heat-sealing and heat-cutting structures, providing conditions for achieving precise temperature control;

[0022] 2. Maximize the transfer of heat from the heating wire to the heated section of the plastic bag to ensure the required heating temperature during the hot cutting process;

[0023] 3. This brings the temperature sensor closer to the heated section of the plastic bag, providing conditions for achieving precise temperature control;

[0024] 4. Independent heating circuits and temperature sensors enable more precise temperature control;

[0025] 5. Heating both sides of the plastic bag simultaneously makes the heating more even and faster;

[0026] 6. The unique heat-cutting and heat-sealing structure allows for staggered positioning, resulting in closer contact between the plastic bag and the heating components and more even heating during heat cutting and heat sealing. [Attached Image Description]

[0027] Figure 1 This is a simplified schematic diagram of the overall pressing assembly of the method for improving the quality of hot melt sealing according to the present invention;

[0028] Figure 2 This is a schematic diagram of the pressing assembly structure of the method for improving the quality of hot melt sealing according to the present invention;

[0029] Figure 3 This is a schematic diagram showing the connection between the first heating component and the first pressing base in the method for improving the quality of hot melt sealing according to the present invention;

[0030] Figure 4 This is a schematic diagram of the second heating component in the method for improving the quality of hot melt sealing according to the present invention.

Detailed Implementation Methods

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0032] It should be noted that in the embodiments of the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are limited to relative positions on the specified view, rather than absolute positions.

[0033] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] Please see Figures 1 to 4The method for improving the quality of hot melt sealing according to the present invention includes a pressing assembly, the pressing assembly including a first pressing assembly 12 and a second pressing assembly 13 that can approach and move away from each other, the first pressing assembly 12 and the second pressing assembly 13 are used to close, heat seal and cut the plastic bag when they approach each other; the positions of the first pressing assembly 12 and the second pressing assembly 13 are arranged opposite to each other.

[0035] The first pressing assembly 12 includes a first pressing base 16, a first heating assembly 17, and a second heating assembly 18; the second pressing assembly 13 includes a second pressing base 19 and a buffer device 20.

[0036] The first heating component 17 is connected to the first pressing base 16. The first heating component 17 is located on both sides of the second heating component 18. The first heating component 17 and the second heating component 18 are independently set and do not interfere with each other. The second heating component 18 is used to cut the plastic bag, and the first heating component 17 is used to heat seal the plastic bag on both sides of the cut.

[0037] When the first pressing component 12 and the second pressing component 13 approach each other, the second heating component 18 cuts the plastic bag, and the first heating component 17 squeezes both sides of the cut and heat seals it.

[0038] The first heating component 17 and the second heating component 18 have different temperature settings, with the temperature of the second heating component 18 being higher than that of the first heating component 17. Specifically, the first heating component 17 and the second heating component 18 can operate independently and in a time-sharing manner; that is, only one of the first heating component 17 or the second heating component 18 can operate, or they can operate simultaneously. When heat cutting of the plastic bag is required, the temperature of the second heating component 18 is higher than that of the first heating component 17.

[0039] The first heating component 17 includes a first heating wire 1701 and a first thermally conductive membrane 1702; the first heating wire 1701 has two heating zones a 1703 and b 1704 that are parallel or nearly parallel to the first direction 6 in the first direction 6; the heating zones a 1703 and b 1704 can also be replaced by two different heating wires, but preferably by the same heating wire.

[0040] The second heating component 18 is movably connected to the first pressing base 16. The second heating component 18 includes a thermal cutting base 1803, a second heating wire 1801, and a second thermally conductive diaphragm 1802.

[0041] The second heating wire 1801 is disposed on the thermal cutting base 1803, and the second thermally conductive diaphragm 1802 covers the outside of the second heating wire 1801 to form a knife edge shape, which is conducive to thermal cutting.

[0042] In the second direction 7, the second heating component 18 is located between heating zone a 1703 and heating zone b 1704; in the third direction 8, when the first pressing component 12 and the second pressing component 13 are closed and pressed together, the second heating component 18 is higher than heating zone a 1703 and heating zone b 1704, that is, the second heating component 18 protrudes from heating zone a 1703 and heating zone b 1704.

[0043] On the third-party direction 8, the first thermally conductive diaphragm 1702 is above the first heating wire 1701, and the second thermally conductive diaphragm 1802 is above the second heating wire 1801.

[0044] The buffer device 20 is fixed to the second pressing base 19. The buffer device 20 includes a buffer sheet 2001 and a third thermally conductive diaphragm 2002. The buffer sheet 2001 is located below the second pressing base 19 in the third direction 8 and needs to be flexible. It can be made of various materials, preferably silicone. The third thermally conductive diaphragm 2002 is located below the buffer sheet 2001 in the third direction 8.

[0045] The first thermally conductive membrane 1702, the second thermally conductive membrane 1802, and the third thermally conductive membrane 2002 of the present invention are made of materials with non-stick properties, preferably Teflon materials.

[0046] The third direction 8 is perpendicular to the pressing surface of the pressing component, the first direction 6 is parallel to the long side of the pressing component, and the second direction 7 is perpendicular to both the first direction 6 and the third direction 8.

[0047] A buffer elastic element 41 and a heat assembly guide structure 42 are also provided between the first pressing base 16 and the first heating assembly 17. The heat assembly guide structure 42 can be a guide rod and / or a guide groove. When the first pressing assembly 12 and the second pressing assembly 13 approach each other, the first heating assembly 17 is forced to move towards the first pressing base 16. At this time, the buffer elastic element 41 provides elastic support. The first heating assembly 17 is fixed to the first pressing base 16 in a smooth movable manner. When the first pressing assembly 12 and the second pressing assembly 13 approach or move away, the first heating assembly 17 and the first pressing base 16 also slide to move closer or further apart.

[0048] Since the second heating component 18 is fixed on the first pressing base 16, and in the third direction 8, the second heating wire 1801 is higher than the first heating wire 1701, the above structure can achieve the following functions: when the first pressing component 12 and the second pressing component 13 come together and are squeezed, the second heating component 18 is embedded in the buffer device 20. Due to the presence of the buffer elastic member 41, the first heating component 17 slides toward the first pressing base 16. Under the elastic force of the buffer elastic member 41, the first heating component 17 and the second pressing component 13 are tightly fitted together, thereby achieving the purpose of both the first heating component 17 and the second heating component 18 being tightly fitted together with the buffer device 20. When there is a plastic bag between the first pressing component 12 and the second pressing component 13, both heat sealing and heat cutting can achieve better results.

[0049] The first heating component 17 has a through hole, and the second heating component 18 passes through the through hole.

[0050] On the third direction 8, the upper end of the thermal cutting base 1803 has a linear groove 1806 for limiting and fixing the second heating wire 1801.

[0051] The linear groove 1806 at the upper end of the thermal cutting base 1803 is provided with an NTC mounting hole 1805 for mounting a temperature sensor. This temperature sensor is used to detect the temperature of the heating wire in real time, so as to achieve precise temperature control of the thermal cutting wire and avoid dry burning and damage to the base and heat-conducting film.

[0052] A heat-resistant protective film 1804 is provided between the thermal cutting base 1803 and the second heating wire 1801 to prevent the thermal cutting base 1803 from overheating when the heating wire heats up.

[0053] The first heating wire 1701 and the second heating wire 1801 are each connected to an independently controllable heating circuit; the first pressing assembly 12 and the second pressing assembly 13 also include at least one temperature sensor, preferably the first pressing assembly 12 and the second heating assembly 18 include a first temperature sensor 1705 and a second temperature sensor 1804 respectively.

[0054] The second pressing assembly 13 also includes a third heating wire 39. The third heating wire 39 has a c heating area 3901 and a d heating area 3902 that are parallel or nearly parallel to the first direction 6. When the first pressing assembly 12 and the second pressing assembly 13 come together, the c heating area 3901 and the d heating area 3902 correspond to the a heating area 1703 and the b heating area 1704, respectively, thereby achieving simultaneous heating from both sides of the heated section of the plastic bag, shortening the heat-sealing time, and making the heating of the plastic bag more uniform.

[0055] The third heating wire 39 can have an independent heating control circuit, or it can share a heating control circuit with the first heating wire 1701. The preferred method is to share a heating control circuit with the first heating wire 1701.

[0056] Compared with the prior art, the method of the present invention for improving the quality of hot melt sealing has the following beneficial effects:

[0057] 1. It blocks heat transfer from the heat-sealing and heat-cutting structures, providing conditions for achieving precise temperature control;

[0058] 2. Maximize the transfer of heat from the heating wire to the heated section of the plastic bag to ensure the required heating temperature during the hot cutting process;

[0059] 3. This brings the temperature sensor closer to the heated section of the plastic bag, providing conditions for achieving precise temperature control;

[0060] 4. Independent heating circuits and temperature sensors enable more precise temperature control;

[0061] 5. Heating both sides of the plastic bag simultaneously makes the heating more even and faster;

[0062] 6. The unique heat-cutting and heat-sealing structure allows for staggered positioning, resulting in closer contact between the plastic bag and the heating components and more even heating during heat cutting and heat sealing.

[0063] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any modifications, equivalent substitutions and improvements made within the concept of the present invention should be included within the patent protection scope of the present invention.

Claims

1. A method for improving the quality of heat-sealed joints, characterized in that, The assembly includes a pressing component, which comprises a first pressing component and a second pressing component that are accessible and removable, wherein the first pressing component and the second pressing component are used to close, heat seal, and cut the plastic bag when they are close together; The first pressing assembly includes a first pressing base, a first heating assembly, and a second heating assembly; the second pressing assembly includes a second pressing base and a buffer device. The first heating component is connected to the first pressing base. The first heating component is located on both sides of the second heating component. The first heating component and the second heating component are set independently and do not interfere with each other. The second heating component is used to cut the plastic bag, and the first heating component is used to heat seal the plastic bag on both sides of the cut. When the first pressing component and the second pressing component come together, the second heating component cuts the plastic bag, and the first heating component squeezes both sides of the cut and heat seals it. The second heating component is fixed on the first pressing base. The second heating component includes a thermal cutting base, a second heating wire, and a second thermally conductive membrane. The second heating wire is disposed on the thermal cutting base, and the second thermally conductive membrane covers the outside of the second heating wire to form a knife edge. The first heating component includes a first thermally conductive membrane, and the first thermally conductive membrane and the second thermally conductive membrane are disposed separately.

2. The method for improving the quality of hot melt sealing as described in claim 1, characterized in that, The first heating element and the second heating element have different temperature settings, with the temperature of the second heating element being higher than that of the first heating element.

3. The method for improving the quality of hot melt sealing as described in claim 1, characterized in that, The first heating component includes a first heating wire; the first heating wire has two heating zones a and b that are parallel or nearly parallel to the first direction. In the second direction, the second heating component is located between heating zone a and heating zone b; in the third direction, when the first pressing component and the second pressing component are brought together and pressed, the second heating component is higher than heating zone a and heating zone b.

4. The method for improving the quality of hot melt sealing as described in claim 3, characterized in that, In the third direction, the first thermally conductive diaphragm is positioned above the first heating wire, and the second thermally conductive diaphragm is positioned above the second heating wire; The buffer device is fixed on the second pressing base, and the buffer device includes a buffer sheet and a third thermally conductive diaphragm. The buffer sheet is positioned below the second pressing base in a third-direction orientation, and the third thermally conductive diaphragm is positioned below the buffer sheet.

5. The method for improving the quality of hot melt sealing as described in claim 1, characterized in that, A buffer elastic element and a heat component guide structure are also provided between the first pressing base and the first heating component, so that the relative position of the first heating component and the second heating component can be misaligned. When the first pressing component and the second pressing component come together to squeeze, the second heating component cuts the plastic bag, and the first heating component squeezes both sides of the cut and moves backward during the squeezing of the plastic bag.

6. The method for improving the quality of hot melt sealing as described in claim 3, characterized in that, In the third direction, the upper end of the thermal cutting base has a linear groove for limiting and fixing the second heating wire.

7. The method for improving the quality of hot melt sealing as described in claim 6, characterized in that, The linear groove at the upper end of the thermal cutting base is provided with an NTC mounting hole for mounting a temperature sensor.

8. The method for improving the quality of hot melt sealing as described in claim 3, characterized in that, A heat-resistant protective film is provided between the thermal cutting base and the second heating wire.

9. The method for improving the quality of hot melt sealing as described in claim 3, characterized in that, The first heating wire and the second heating wire are respectively connected to independently controllable heating circuits; the first pressing assembly and the second heating assembly respectively include a first temperature sensor and a second temperature sensor.

10. The method for improving the quality of hot melt sealing as described in claim 3, characterized in that, The second pressing assembly also includes a third heating wire, which has a heating area c and a heating area d parallel or nearly parallel to the first direction. When the first pressing assembly and the second pressing assembly come together, the heating area c and the heating area d correspond to the heating area a and the heating area b, respectively.

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