Method for improving hot melting sealing quality

Abstract

The invention relates to the technical field of plastic bag hot-melting sealing, in particular to a method for improving hot-melting sealing quality, which comprises a press-fit assembly, the press-fit assembly comprises a first press-fit assembly and a second press-fit assembly capable of approaching and leaving, when the first press-fit assembly approaches the second press-fit assembly, a second heating assembly cuts off a plastic bag, and when the second press-fit assembly does not approach the first press-fit assembly, the second heating assembly cuts off the plastic bag; the first heating assembly extrudes the two sides of the notch and conducts heat sealing; the second heating assembly is fixed to the first pressing base, the second electric heating wire is arranged on the thermal cutting base, and the second heat conduction diaphragm covers the outer side of the second electric heating wire to form a knife edge shape. Compared with the prior art, the method for improving the hot-melting sealing quality can ensure that bags on the two sides of a fracture are subjected to heat sealing completeness and do not adhere to equipment under the condition that the plastic bags are cut off, the hot-melting sealing quality is improved, automatic packaging operation of the plastic bags is more stable and reliable, continuous work of the equipment is facilitated, and the maintenance cost is reduced; and the use experience of the user is improved.

Description

[Technical field]

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

[0002] In the prior art waste continuous automatic packaging equipment, cylindrical plastic bags are usually used. When heat sealing and heat cutting are performed, heat sealing and heat cutting integrated heating components are usually used for heating, which easily leads to the following problems:

[0003] 1. There is heat transfer between the heat cutting structure and the heat sealing structure, which makes it difficult to accurately control the temperature. It is difficult to meet the heat sealing temperature and the heat cutting temperature at the same time, which can easily cause overheating or insufficient heat of the plastic bag.

[0004] 2. When hot cutting plastic bags, the plastic bags need to be melted, so a sufficiently high temperature is required; at the same time, the plastic bags and the hot cutting heating wire need not stick together, so a non-stick diaphragm needs to be added. The mainstream methods on the market are:

[0005] a. The heating wire directly heats and melts the plastic bag. The ultra-high temperature of the heating wire easily causes the plastic bag to stick to the heating wire, which needs to be cleaned frequently to ensure normal use. In addition, since the heating wire needs to be relatively thin and long to have sufficient impedance to generate enough heat, the thin and long characteristics result in the heating wire lacking sufficient diameter height to cut the plastic bag;

[0006] b. Combination of heating wire and heat-conducting parts with knife-edge characteristics: There are also heating wires and metal heat-conducting parts with knife-edge characteristics on the market, which are combined for heat sealing and hot cutting. This method overcomes the defect of insufficient diameter height of the heating wire, but because metal is conductive, it is necessary to add an insulating film between the metal heat-conducting parts and the heating wire, which will cause the temperature sensor to be far away from the heating section of the plastic bag, which will increase the difficulty of temperature control and cause poor heat sealing and hot cutting effects. In addition, metal heat-conducting parts will absorb and dissipate a lot of heat, which may easily cause the temperature of the heating wire to fail to reach the ideal hot cutting temperature value, thus causing hot cutting failure. [Summary of the invention]

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

[0008] A technical solution provided by the present invention to solve the above technical problems is: to provide a method for improving the quality of hot melt sealing, including a pressing assembly, wherein the pressing assembly includes a first pressing assembly and a second pressing assembly that can be approached and moved away, and the first pressing assembly and the second pressing assembly are used to close, heat-seal and cut the plastic bag when they are close to each other; 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 the first heating assembly is located on both sides of the second heating assembly. The first heating component and the second heating component are independently arranged without interfering with each other, wherein 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 fracture; when the first pressing component and the second pressing component are brought close to each other, the second heating component cuts the plastic bag, and the first heating component squeezes both sides of the incision and performs heat sealing; the second heating component is fixed on the first pressing base, and the second heating component includes a heat cutting base, a second heating wire, and a second heat conductive diaphragm, the second heating wire is arranged on the heat cutting base, and the second heat conductive diaphragm covers the outer side of the second heating wire to form a knife edge shape.

[0009] Preferably, the first heating component and the second heating component are set at different temperatures, and the temperature of the second heating component is higher than that of the first heating component.

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

[0011] Preferably, in the third direction, the first heat-conductive diaphragm is located above the first heating wire, and the second heat-conductive diaphragm is located above the second heating wire;

[0012] The buffer device is fixed on the second pressing base, and comprises a buffer sheet and a third heat-conducting diaphragm; the buffer sheet is located below the second pressing base in the third direction, and the third heat-conducting diaphragm is located below the buffer sheet.

[0013] Preferably, a buffer elastic member and a heat assembly guide structure are also provided between the first pressing base and the first heating assembly, so that relative position displacement can be generated between the first heating assembly and the second heating assembly. When the first pressing assembly and the second pressing assembly are close together and squeezed, the second heating assembly cuts the plastic bag, and the first heating assembly squeezes both sides of the cut and retreats during the squeezing of the plastic bag. When the first pressing assembly and the second pressing assembly are close together, the first heating assembly is forced to move closer to the first pressing base, and the buffer elastic member provides elastic support force at this time; the first heating assembly is fixed to the first pressing base in a smoothly movable manner, and when the first pressing assembly and the second pressing assembly move closer or farther away, the first heating assembly and the first pressing base also move closer or farther away by 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 temperature-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 include a first temperature sensor and a second temperature sensor, respectively.

[0018] Preferably, the second pressing assembly also includes a third heating wire, which has a heating zone c and a heating zone d parallel or nearly parallel to the first direction in the first direction. When the first pressing assembly and the second pressing assembly are brought closer, the heating zone c and the heating zone d correspond to the heating zone a and the heating zone b respectively.

[0019] The first heat-conducting diaphragm, the second heat-conducting diaphragm and the third heat-conducting diaphragm of the present invention are made of materials with non-stick properties, preferably Teflon materials.

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

[0021] 1. Blocking the heat transfer between the heat sealing structure and the hot cutting structure, providing conditions for achieving precise temperature control;

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

[0023] 3. Make 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 make temperature control more accurate;

[0025] 5. Both sides of the plastic bag are heated at the same time, making the heating more uniform and faster;

[0026] 6. The unique heat cutting and heat sealing can be offset from each other, so that the plastic bag and the heating component are in closer contact and heated more evenly during heat cutting and heat sealing.

Brief Description of the Drawings

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

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

[0029] Figure 3 A schematic diagram of the connection between the first heating assembly and the first pressing base of the method for improving the quality of hot melt sealing of the present invention;

[0030] Figure 4 A schematic diagram of the structure of the second heating component of the method for improving the quality of hot melt sealing of the present invention. [Specific implementation method]

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present 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] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] See also Figures 1 to 4The method for improving the quality of hot-melt sealing of the present invention comprises a pressing assembly, wherein the pressing assembly comprises a first pressing assembly 12 and a second pressing assembly 13 which can approach and move away from each other, and 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 position of the first pressing assembly 12 and the position of the second pressing assembly 13 are relatively arranged.

[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 arranged 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 bags on both sides of the fracture.

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

[0038] The first heating component 17 and the second heating component 18 are set at different temperatures, and the temperature of the second heating component 18 is higher than that of the first heating component 17. It is particularly noted that the first heating component 17 and the second heating component 18 can work independently in time-sharing, that is, only one of the first heating component 17 and the second heating component 18 can work, or they can work at the same time. When the plastic bag needs to be hot-cut, 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 heat-conductive diaphragm 1702; the first heating wire 1701 has two heating zones a 1703 and b 1704 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, preferably the same heating wire.

[0040] The second heating component 18 is movably connected to the first pressing base 16, and the second heating component 18 includes a thermal cutting base 1803, a second electric heating wire 1801, and a second heat-conducting diaphragm 1802;

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

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

[0043] In the third direction 8 , the first heat-conductive diaphragm 1702 is located above the first heating wire 1701 , and the second heat-conductive diaphragm 1802 is located above the second heating wire 1801 .

[0044] The buffer device 20 is fixed on the second pressing base 19, and includes a buffer sheet 2001 and a third heat-conducting diaphragm 2002; the buffer sheet 2001 is located below the second pressing base 19 in the third direction 8, and needs to have the characteristic of flexibility, and can be made of a variety of different materials, preferably using a silicone material. The third heat-conducting diaphragm 2002 is located below the buffer sheet 2001 in the third direction 8.

[0045] The materials used in the first heat-conducting diaphragm 1702, the second heat-conducting diaphragm 1802, and the third heat-conducting diaphragm 2002 of the present invention have non-stick properties, and Teflon materials are preferred.

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

[0047] A buffer elastic member 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 may be a guide rod and / or a guide groove. When the first pressing assembly 12 and the second pressing assembly 13 are brought close to each other, the first heating assembly 17 is forced to move close to the first pressing base 16. At this time, the buffer elastic member 41 provides an elastic support force. The first heating assembly 17 is fixed to the first pressing base 16 in a smoothly movable manner. When the first pressing assembly 12 and the second pressing assembly 13 are brought close to or away from each other, the first heating assembly 17 and the first pressing base 16 are also moved close to or away from each other by sliding.

[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 are squeezed close together, 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 is tightly fitted with the second pressing component 13, thereby achieving the purpose of the first heating component 17 and the second heating component 18 being tightly fitted 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 relatively good results.

[0049] The first heating component 17 is provided with a via hole, and the second heating component 18 passes through the via hole.

[0050] In 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. The temperature sensor is used to detect the temperature of the heating wire in real time, realize accurate temperature control of the hot cutting wire, and avoid dry burning to damage the base and the thermal conductive film.

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

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

[0054] The second pressing component 13 also includes a third heating wire 39, and the third heating wire 39 has a c heating zone 3901 and a d heating zone 3902 parallel or nearly parallel to the first direction 6 in the first direction 6. When the first pressing component 12 and the second pressing component 13 are close to each other, the c heating zone 3901 and the d heating zone 3902 correspond to the a heating zone 1703 and the b heating zone 1704 respectively, thereby achieving simultaneous heating from both sides of the heated section of the plastic bag, shortening the time of hot melt sealing, and heating the plastic bag more evenly.

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

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

[0057] 1. Blocking the heat transfer between the heat sealing structure and the hot cutting structure, providing conditions for achieving precise temperature control;

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

[0059] 3. Make 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 make temperature control more accurate;

[0061] 5. Both sides of the plastic bag are heated at the same time, making the heating more uniform and faster;

[0062] 6. The unique heat cutting and heat sealing can be offset from each other, so that the plastic bag and the heating component are in closer contact and heated more evenly 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 in the patent protection scope of the present invention.

Claims

1. A method for improving the quality of hot melt sealing, characterized in that: The pressing assembly comprises a first pressing assembly and a second pressing assembly which can be approached and moved away from each other. When the first pressing assembly and the second pressing assembly are approached, they are used to close, heat-seal and cut the plastic bag; 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 independently arranged and do not interfere with each other, wherein the second heating component is used to cut off the plastic bag, and the first heating component is used to heat-seal the plastic bag on both sides of the fracture; When the first pressing assembly and the second pressing assembly are brought close to each other, the second heating assembly cuts the plastic bag, and the first heating assembly squeezes both sides of the cut and performs heat sealing; The second heating component is fixed on the first pressing base, and the second heating component includes a thermal cutting base, a second heating wire, and a second thermally conductive diaphragm. The second heating wire is arranged on the thermal cutting base, and the second thermally conductive diaphragm covers the outer side of the second heating wire to form a knife edge.

2. The method for improving the quality of hot melt sealing according to claim 1, characterized in that: The first heating component and the second heating component have different temperature settings, and the temperature of the second heating component is higher than the temperature of the first heating component.

3. The method for improving the quality of hot melt sealing according to claim 1, characterized in that: The first heating component comprises a first heating wire and a first heat-conducting diaphragm; the first heating wire has two heating zones a and b which are parallel or nearly parallel to the first direction in the first direction; In the second direction, the second heating assembly is located between heating zone a and heating zone b; in the third direction, when the first pressing assembly and the second pressing assembly are closed and squeezed, the second heating assembly is higher than heating zone a and heating zone b.

4. The method for improving the quality of hot melt sealing according to claim 3, characterized in that: In the third direction, the first heat-conductive diaphragm is located above the first heating wire, and the second heat-conductive diaphragm is located 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 heat-conducting diaphragm; The buffer sheet is located below the second pressing base in the third direction, and the third heat-conducting diaphragm is located below the buffer sheet.

5. The method for improving the quality of hot melt sealing according to claim 1, characterized in that: A buffer elastic member and a heat component guide structure are also provided between the first pressing base and the first heating component, so that a relative position shift can be generated between the first heating component and the second heating component. When the first pressing component and the second pressing component are squeezed close together, the second heating component cuts off the plastic bag, and the first heating component squeezes both sides of the incision and retreats during the squeezing process of the plastic bag.

6. The method for improving the quality of hot melt sealing according to 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 according to 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 according to claim 3, characterized in that: A temperature-resistant protective film is arranged between the thermal cutting base and the second electric heating wire.

9. The method for improving the quality of hot melt sealing according to 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 component and the second heating component include a first temperature sensor and a second temperature sensor respectively.

10. The method for improving the quality of hot melt sealing according to claim 3, characterized in that: The second pressing assembly also includes a third heating wire, which has a heating zone c and a heating zone d parallel or nearly parallel to the first direction in the first direction. When the first pressing assembly and the second pressing assembly are close to each other, the heating zone c and the heating zone d correspond to the heating zone a and the heating zone b respectively.

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