Heat seal start-stop method for bubble film

Abstract

The application discloses a heat sealing start-stop method of bubble film. When the key of the air cushion machine is pressed, the heating wheel starts to decelerate. When the sealing line on the original film collides with the push piece at the inflation nozzle on the air cushion machine, it indicates that the new un-inflated air chamber is ready to start inflation. At this time, the controller controls the heating wheel to start decelerating in a new deceleration mode B. When the linear speed of the heating wheel is decelerated to 0, the sealing line B on the original film is just transmitted to the area of 0-2 cm on the side close to the inflation nozzle of the heat sealing starting position or the area of the distance greater than or equal to 4 cm and less than L1 from the heat sealing starting position on the side close to the inflation nozzle of the heat sealing starting position, so that the air cushion machine can produce the bubble film meeting the requirements next time, the probability of defective products is reduced, the utilization rate of the bubble film is improved, and the cost expenditure is reduced.

Description

Technical Field

[0001] This invention relates to the field of air cushion machines for producing bubble wrap, and particularly to a method for starting and stopping the heat sealing of bubble wrap. Background Technology

[0002] Bubble wrap is a cushioning, protective, shock-absorbing, and impact-resistant material commonly used in logistics and express delivery boxes. It serves to fill the space in the boxes and protect the contents. An air cushion machine is one of the devices used to produce bubble wrap.

[0003] An air cushion machine inflates an open film and heat-seals the inflator to form a three-dimensional bubble film product. An air cushion machine generally includes a pair of driven rollers and an inflation nozzle connected to an air supply device. The film is pulled and conveyed by the rollers. During the pulling process, the inflation nozzle pushes gas into the air chamber of the film. One of the rollers is a heating roller with a heating effect, and the other is a rubber roller. The heating roller and the rubber roller are pressed against the inflation port of the film to inflate the film and then heat-seal it.

[0004] During use, the inflated bubble wrap is placed into the box. Normally, it is inflated and placed in at the same time. Because the bubble wrap itself has a large volume after inflation, it is generally not pre-inflated and is used on-site during production. Therefore, when the box is full of bubble wrap products, the air cushion machine will be gradually stopped and the next box will be used for production.

[0005] After the air cushion machine stops operating, the sealing position of the original film is random. This means it's uncertain whether the air chambers already inflated on the original film are completely heat-sealed by the heating wheel. If the stopping position is still a considerable distance from the heating wheel's complete sealing of the opening, and the inflation nozzle can still inflate the air chamber on the original film, the air cushion machine can continue inflating and heat-sealing the air chamber after restarting. If the stopping position is closer to the heating wheel, but the inflation nozzle can still inflate the air chamber on the original film, the air cushion machine can continue inflating and heat-sealing the air chamber after restarting, but the sealing position of the air chamber on the original film will be uncertain during the time between stopping and restarting. Excessive gas overflow from the air chamber reduces the air volume in that chamber on the original paper guide film, decreasing the three-dimensional effect and reducing the protective, cushioning, and shock-absorbing effects, thus lowering the overall quality. When the stop position is very close to the heating wheel, and the inflation nozzle cannot inflate the air chamber on the original film, the air cushion machine can only heat-seal the air chamber after starting. However, during the time between stopping and restarting, the gas in that air chamber on the original film will overflow, significantly reducing the air volume in the air chamber on the original paper guide film, resulting in poor three-dimensional effect and greatly reducing the protective, cushioning, and shock-absorbing effects, thus significantly lowering the overall quality. In such cases, the air chamber on the original film is generally discarded. Due to the large volume of express delivery, the air cushion machine will inevitably be started and stopped multiple times, resulting in significant waste of bubble wrap, greatly increasing costs and causing unnecessary waste.

[0006] Therefore, overcoming the aforementioned technical deficiencies is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a method for starting and stopping the heat sealing of bubble film to solve at least one of the above-mentioned technical problems.

[0008] According to one aspect of the present invention, a method for starting and stopping the heat sealing of bubble film is provided, comprising the following steps:

[0009] a. A heating wheel used to make bubble wrap heat-seals the inflated original film at a linear velocity of V;

[0010] b. When the power switch of the air cushion machine is pressed, the linear speed of the heating wheel begins to decelerate in deceleration mode A, and the original film continues to be conveyed;

[0011] c. When the sealing line A on the original film touches the lever at the air inlet of the air cushion machine, the linear velocity of the heating wheel is V1;

[0012] d. The controller of the air cushion machine controls the linear speed of the heating wheel to decelerate in deceleration mode B;

[0013] e. When the linear velocity of the heating wheel drops to 0, the sealing line B on the original film is transferred to position C.

[0014] Taking the starting position of the heat sealing of the original film by the heating wheel as the starting point, the distance from the starting point to position C is L, and the width of the air inlet of each air chamber on the original film is L1.

[0015] 0≤L≤2cm, when L is not equal to 0, position C is located on the side of the starting point closest to the inflation nozzle on the air cushion machine, or

[0016] 4cm≤L<L1, position C is located on the side of the starting point near the inflation nozzle on the air cushion machine.

[0017] In the heat-sealing start / stop method of this invention, when the power switch of the air cushion machine is pressed, the heating wheel begins to decelerate in deceleration mode A. When the sealing line on the original film touches the lever at the inflation nozzle on the air cushion machine, it indicates that a new uninflated air chamber is ready to be inflated. At this time, the controller controls the heating wheel to decelerate in a new deceleration mode B. When the linear speed of the heating wheel decelerates to 0, the sealing line B on the original film is just conveyed to the 0-2cm area near the inflation nozzle on the side of the heat-sealing start position. In this case, the inflation port of the first air chamber downstream of the sealing line B may not be heat-sealed for up to 2cm. The small amount of overflow will not render the air chamber unusable, meeting the minimum inflation requirement of the bubble wrap. When the air cushion machine is started again, the inflation nozzle can completely cover the upstream of the sealing line B. The first air chamber to be inflated is filled; or, when the linear speed of the heating wheel decelerates to 0, the sealing line B on the original film is just conveyed to the area near the heat sealing start position on the side close to the inflation nozzle, which is greater than or equal to 4cm and less than L1. In this case, at least 4cm of the inflation port of the first air chamber downstream of the sealing line B is not heat-sealed, ensuring that the first air chamber downstream of the sealing line B has enough width to overlap with the inflation nozzle for the inflation nozzle to continue inflating it. When the air cushion machine starts again, the inflation nozzle can fill the first air chamber downstream of the sealing line B. In this way, it is ensured that the air cushion machine can produce qualified bubble film when it starts again, reducing the probability of defective products, improving the utilization rate of bubble film, and reducing cost expenditure.

[0018] In some embodiments, in step c, the inflation nozzle on the air cushion machine can be a flat, open shape, with the middle part of the lever hinged in the inflation nozzle and one end of the lever extending out of the inflation nozzle, while the other end of the lever can be inserted between the transmitter and receiver of the photoelectric sensor.

[0019] When one end of the paddle touches the sealing line A on the original film, the other end of the paddle retracts from between the transmitter and receiver of the photoelectric sensor, and the photoelectric sensor sends a switch signal to the controller of the air cushion machine.

[0020] Therefore, when the sealing line A on the original film touches the lever extending from the inflation nozzle on the air cushion machine, it indicates that the new uninflated air chamber is ready to start inflating. After one end of the lever is touched by the sealing line on the original film, since the middle of the lever is hinged in the inflation nozzle, the other end of the lever will exit between the transmitter and receiver of the photoelectric sensor. At this time, the photoelectric sensor will send a switch signal to the controller of the air cushion machine, that is, the position of the sealing line between each air chamber on the original film can be detected by the lever. Then the controller of the air cushion machine controls the linear speed of the heating wheel to start deceleration in deceleration mode B.

[0021] In some implementations, the paddle may be located at the end of the inflation nozzle furthest from the heating wheel.

[0022] Therefore, when the uninflated air chamber on the original membrane is conveyed to the flat-opening air nozzle to prepare for inflation, the sealing line of the air chamber near the air nozzle will immediately touch the lever at the end of the air nozzle away from the heating wheel. The lever can detect the sealing line of the air chamber immediately, so that the photoelectric sensor generates a switching signal.

[0023] In some implementations, in step b, deceleration mode A can be the linear velocity of the heating wheel decelerating at deceleration A, and in step d, deceleration mode B can be the linear velocity of the heating wheel decelerating at deceleration B, where deceleration B is less than deceleration A.

[0024] Therefore, when the sealing line on the original film touches the lever at the air nozzle on the air cushion machine, the controller of the air cushion machine controls the linear speed of the heating wheel to decelerate at a smaller deceleration B, so as to ensure that when the linear speed of the heating wheel drops to 0, the sealing line B on the original film is just transmitted to the area of ​​0-2cm on the side of the heat sealing start position near the air nozzle, or the area of ​​the heat sealing start position near the air nozzle with a distance greater than or equal to 4cm and less than L1.

[0025] In some implementations, sealing line A in step c and sealing line B in step e can be the same sealing line. Thus, when the linear speed of the heating wheel decelerates to 0, the sealing line A detected by the paddle is just conveyed to a region of 0-2 cm near the inflation nozzle at the start of the heat sealing. In this case, the inflation port of the first air chamber downstream of sealing line A may not be heat-sealed for up to 2 cm. A small amount of overflow will not render the air chamber unusable, meeting the minimum inflation requirement for bubble wrap. When the air cushion machine starts again, the inflation nozzle can completely fill the first air chamber upstream of sealing line A. Alternatively, when the linear speed of the heating wheel decelerates to 0, the sealing line A detected by the paddle is just conveyed to a region of 4 cm or more and less than L1 from the start of the heat sealing, near the inflation nozzle. In this case, the inflation port of the first air chamber downstream of sealing line A has sufficient width to overlap with the inflation nozzle for subsequent inflation. When the air cushion machine starts again, the inflation nozzle can fill the first air chamber downstream of sealing line A.

[0026] In some embodiments, in step e, the starting position of the heat sealing of the original film by the heating wheel can be: the end of the pressing area between the heating wheel and the rubber wheel near the inflation nozzle when the heating wheel and the rubber wheel of the air cushion machine are pressed together for heat sealing.

[0027] Therefore, the air cushion machine includes a pair of driven rollers, one of which is a heating roller with a heating effect, and the other is a rubber roller. The heating roller and the rubber roller are pressed together at the air inlet of the original film for heat sealing and at the same time, the original film is pulled and transported downstream. Since the heating roller is pressed on the rubber roller, the rubber roller will deform, so there is a deformation pressing area between the heating roller and the rubber roller. This deformation pressing area can heat seal the air inlet of the original film.

[0028] In some implementations, in step e, 0 ≤ L ≤ 1.5 cm, or 8 cm ≤ L < L1. Thus, when the linear velocity of the heating wheel decelerates to 0, the sealing line B on the original film is just conveyed to the 0-1.5 cm region near the inflation nozzle at the heat-sealing start position. In this case, the inflation port of the first air chamber downstream of the sealing line B may not be heat-sealed for up to 1.5 cm. This maximum 1.5 cm unsealed opening will only cause a small amount of gas to escape, meeting the minimum inflation requirement of the bubble wrap. Alternatively, when the linear velocity of the heating wheel decelerates to 0, the sealing line B on the original film is just conveyed to the region near the inflation nozzle at the heat-sealing start position, where the distance from the heat-sealing start position is greater than or equal to 8 cm and less than L1. In this case, it can be further ensured that the inflation port of the first air chamber downstream of the sealing line B has sufficient width to overlap with the inflation nozzle for subsequent inflation. When the air cushion machine starts again, the inflation nozzle can fill the first air chamber downstream of the sealing line B.

[0029] In some embodiments, step f may also be included: when the air cushion machine restarts, the air nozzle of the air cushion machine first inflates the original film for time T1, while the heating wheel of the air cushion machine heats for time T2, and then the heating wheel of the air cushion machine starts to rotate to pull the original film for transport.

[0030] Therefore, when the air cushion machine restarts, it does not start immediately, but first inflates the original film for a time T1. This ensures that when the heating wheel pulls the original film after time T1, it can immediately provide stable inflation to the original film, rather than gradually increasing the inflation amount from 0 to 1. On the other hand, pre-inflating the original film can improve the overall inflation efficiency of the original film. At the same time, the heating wheel is also preheated during time T2 to ensure the temperature stability of subsequent heat sealing.

[0031] In some implementations, T1 = T2 = 80ms.

[0032] Therefore, when the air cushion machine restarts, it first inflates the original film for 80ms. This way, when the heating wheel pulls the original film to be conveyed, it can immediately provide stable inflation to the original film. Pre-inflating the original film for 80ms can improve the overall inflation efficiency of the original film. Moreover, during the 80ms pre-inflating time, the heating wheel preheats simultaneously to ensure the temperature stability of the subsequent heat sealing.

[0033] In some embodiments, when the heating wheel of the air cushion machine begins to rotate to traction the original film for transport, the inflation port of the first air chamber downstream of the sealing line B has a width of at least 0.4*L1 that passes through the inflation nozzle of the air cushion machine for inflation. Thus, when the heating wheel of the air cushion machine begins to rotate to traction the original film for transport, the inflation port of the first air chamber downstream of the sealing line B overlaps with the inflation nozzle by at least 0.4*L1 width, ensuring that the inflation nozzle can fill the air chamber completely.

[0034] In some embodiments, the time required for the linear velocity of the heating wheel to decrease from V1 to 0 is T3, the deceleration B = V1 / T3, and the distance from the position of the sealing line A in step c, from the position of the paddle to the starting position of the heat sealing of the original film by the heating wheel, is L2, where L2 = (V1*T3) / 2. Thus, the deceleration B = V1 2 / (2*L2).

[0035] Therefore, V1 can be monitored in real time by the speed sensor, and L2 can be measured and recorded in the controller of the air cushion machine. When L2 and V1 are determined, the controller of the air cushion machine can calculate T3, and then calculate the deceleration B of the linear velocity of the heating wheel from V1 to 0 according to B = V1 / T3. In this way, the controller of the air cushion machine can control the linear velocity of the heating wheel to decelerate by the deceleration B. In this way, when the linear velocity of the heating wheel decelerates to 0, the sealing line A in step c is just transmitted to the starting position of the heat sealing of the original film by the heating wheel. Attached Figure Description

[0036] Figure 1 A flowchart of a heat-sealing start-up and stop method for bubble film according to one embodiment of the present invention;

[0037] Figure 2 A schematic diagram of an air cushion machine using the heat-sealing start-stop method for bubble film of the present invention;

[0038] Figure 3 for Figure 2 The diagram shows the state of the air cushion machine when the paddle is touched by the sealing line on the original film during the production of bubble wrap.

[0039] Figure 4 for Figure 3 The diagram shows the state when the linear velocity of the heating wheel of the air cushion machine drops to 0. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0042] Figure 1 The flowchart of a heat-sealing start-up and shutdown method for bubble film according to one embodiment of the present invention is illustrated schematically.

[0043] refer to Figure 1 A method for starting and stopping the heat sealing of bubble wrap includes the following steps:

[0044] 101: The heating wheel used to make bubble wrap heat-seals the inflated original film at a linear velocity of V;

[0045] The air cushion machine includes a pair of driven rollers, one of which is a heating roller with a heating effect, and the other is a rubber roller. The heating roller and the rubber roller are pressed together at the air inlet of the original film for heat sealing and at the same time, the original film is pulled downstream. Since the heating roller is pressed on the rubber roller, the rubber roller will deform, so there will be a deformation pressing area between the heating roller and the rubber roller. This area heat seals the air inlet of the original film.

[0046] 102: When the power switch of the air cushion machine is pressed, the linear speed of the heating wheel begins to decelerate in deceleration mode A, and the original film continues to be conveyed.

[0047] When the power switch of the air cushion machine is pressed during operation, the air cushion machine does not stop immediately. That is, the drive device that drives the heating wheel and rubber wheel on the air cushion machine does not stop immediately. Instead, it gradually decelerates. The controller on the air cushion machine controls the linear speed of the heating wheel to start deceleration in deceleration mode A.

[0048] In this embodiment, deceleration mode A is when the linear velocity of the heating wheel decelerates by deceleration A. That is, when the power switch of the air cushion machine is pressed, the controller of the air cushion machine controls the linear velocity of the heating wheel to start decelerating by deceleration A.

[0049] In other embodiments, deceleration mode A may also decelerate unevenly or in a non-uniform manner, depending on the need.

[0050] 103: When the sealing line A on the original film touches the paddle at the air inflator on the air cushion machine, the linear velocity of the heating wheel is V1;

[0051] The original membrane has one air chamber after another distributed along its conveying direction. The two adjacent air chambers are connected by a sealing line. Each air chamber has an inflation port facing the inflation nozzle of the air cushion machine.

[0052] The air nozzle on the air cushion machine is flat and open. The middle part of the lever is hinged in the air nozzle, and one end of the lever extends out of the air nozzle. The other end of the lever is inserted between the transmitter and receiver of the photoelectric sensor. When the end of the lever that extends out of the air nozzle is touched by the sealing line on the original membrane, it indicates that the new uninflated air chamber is ready to start inflating. Since the middle part of the lever is hinged in the air nozzle, the other end of the lever will exit between the transmitter and receiver of the photoelectric sensor. At this time, the photoelectric sensor will send a switch signal to the controller of the air cushion machine. At this time, the linear speed of the heating wheel of the air cushion machine is V1. V1 can be detected in real time by the speed sensor on the air cushion machine and sent to the controller of the air cushion machine. The position of the sealing line between each air chamber on the original membrane can be detected by the lever in the air nozzle on the air cushion machine.

[0053] In this embodiment, the detection of the paddle being touched by the sealing line is achieved by a photoelectric sensor. In other embodiments, other types of sensors can also be used to detect when the paddle is touched by the sealing line, such as microswitches, ultrasonic sensors, capacitive sensors, pressure sensors, etc., as long as it can ensure that a switching signal is generated when the end of the paddle protruding from the inflation nozzle is touched by the sealing line on the original film to send to the controller's sensor.

[0054] In addition, the paddle is located at the end of the inflation nozzle furthest from the heating wheel. In this way, when the uninflated air chamber on the original membrane is transported to the flat-opening inflation nozzle to start inflation, the sealing line of the air chamber near the inflation nozzle will immediately touch the paddle at the end of the inflation nozzle furthest from the heating wheel. The paddle can detect the sealing line of the air chamber immediately so that the photoelectric sensor generates a switching signal.

[0055] 104: The controller of the air cushion machine controls the linear speed of the heating wheel to begin deceleration in deceleration mode B;

[0056] When the sealing line A on the original film touches the lever at the air inflation nozzle on the air cushion machine, it indicates that the new uninflated air chamber on the original film is ready to start inflating. At this time, the controller controls the linear speed of the heating wheel to start decelerating in a new deceleration mode B.

[0057] In this embodiment, deceleration mode B is that the linear speed of the heating wheel is reduced by deceleration B, and the deceleration B is less than the deceleration A in step 102. That is, when a sealing line on the original film touches the paddle at the air nozzle on the air cushion machine, the controller of the air cushion machine controls the linear speed of the heating wheel to decelerate by a smaller deceleration B, so as to ensure that when the linear speed of the heating wheel drops to 0, the air chamber on the original film downstream of the sealing line is heat-sealed by the heating wheel, and the air inlet of the first air chamber to be inflated upstream of the sealing line has a sufficient width to overlap with the air nozzle on the air cushion machine for subsequent inflation by the air nozzle.

[0058] In other embodiments, depending on the magnitude of V1 in step 103, the deceleration B can be less than or equal to the deceleration A, as long as it is ensured that when the linear velocity of the heating wheel drops to 0 in the subsequent step 105, the sealing line B mentioned in step 105 is just delivered to position C.

[0059] 105: When the linear velocity of the heating wheel drops to 0, the sealing line B on the original film is transferred to position C;

[0060] The air cushion machine includes a pair of driven rollers, one of which is a heating roller with a heating effect, and the other is a rubber roller. The heating roller and the rubber roller press against the air inlet of the original film to perform heat sealing and simultaneously pull the original film downstream. Since the heating roller is pressed on the rubber roller, the rubber roller will deform, so there is a deformed pressing area between the heating roller and the rubber roller. This area heat seals the air inlet of the original film. Therefore, the starting position of the heat sealing of the original film by the heating roller of the air cushion machine is: when the heating roller and the rubber roller of the air cushion machine press together to heat seal the original film, the end of the pressing area between the heating roller and the rubber roller is closer to the air inlet.

[0061] The sealing line A mentioned in step 103 is used for detection by the paddle on the air cushion machine. The sealing line B in step 105 can be the same as the sealing line A in step 103, or they can be different. As long as it is ensured that when the linear speed of the heating wheel drops to 0, a certain sealing line on the original film is transmitted to position C, the area of ​​position C can be limited. In this embodiment, the sealing line A in step 103 and the sealing line B in step 105 are the same sealing line.

[0062] Taking the starting point of the heat sealing of the original film by the heating wheel as the starting point, the distance from the starting point to position C is L, and the width of the air inlet of each air chamber on the original film is L1. In this embodiment, 0≤L≤2cm; when L=0, it means that the sealing line A on the original film has just been transferred to the starting point of the heat sealing of the original film by the heating wheel. In this case, the air chamber on the original film downstream of the sealing line A is just completely heat-sealed by the heating wheel, and the air inlet of the first air chamber to be inflated upstream of the sealing line A has enough width to overlap with the air inlet for subsequent inflation by the air inlet. L=0 is the most preferred solution; when 0<L≤2cm, it means that the sealing line A on the original film has just been transferred to the area of ​​0~2cm (excluding 0) near the air inlet on the side of the heat sealing starting point. In this case, the sealing line At most 2cm of the air inlet of the first air chamber downstream of A may not be heat-sealed by the heating wheel. The small amount of overflow will not render the air chamber unusable, which meets the minimum inflation requirement of the bubble wrap. When the air cushion machine is started again, the inflation nozzle can completely fill the first air chamber to be inflated upstream of the sealing line A. Preferably, 0 < L ≤ 1.5cm. When the linear speed of the heating wheel decelerates to 0, the sealing line A on the original film is just transferred to the 0-1.5cm (excluding 0) area near the inflation nozzle side of the heat sealing start position. In this case, at most 1.5cm of the air inlet of the first air chamber downstream of the sealing line A may not be heat-sealed by the heating wheel. The maximum 1.5cm of unsealed opening will only cause a small amount of gas to overflow, which can ensure the minimum inflation requirement of the bubble wrap.

[0063] Taking the starting point of the heat sealing of the original film by the heating wheel as the starting point, the distance from the starting point to position C is L, and the width of the air inlet of each air chamber on the original film is L1. In other embodiments, 4cm≤L<L1, and the width L1 of the air inlet of each air chamber on the original film is greater than 4cm. Position C is located on the side of the starting point near the air nozzle on the air cushion machine. When the linear velocity of the heating wheel decelerates to 0, the sealing line B on the original film is just transferred to the area on the side of the starting point near the air nozzle, which is at least 4cm away from the starting point and less than L1. In this case, at least 4cm of the air inlet of the first air chamber downstream of the sealing line B at position C is not heat-sealed, ensuring that the first air chamber downstream of the sealing line B has sufficient width to overlap with the air nozzle. The air inflator will continue to inflate the air cushion machine. When the machine starts again, the air inflator will fill the first air chamber downstream of the sealing line B. Preferably, 8cm ≤ L < L1. In this case, at least 8cm of the air inlet of the first air chamber downstream of the sealing line B at position C will not be heat-sealed, ensuring that the first air chamber downstream of the sealing line B has enough width to overlap with the air inflator for the air inflator to continue inflating it. When L = L1, when the linear speed of the heating wheel decelerates to 0, the sealing line B on the original film is just transmitted to the position L1 away from the starting point on the side near the air inflator. That is, the first sealing line downstream of the sealing line B is just transmitted to the starting position of the heat sealing of the original film by the heating wheel, which is the same as the case of L = 0.

[0064] 106: When the air cushion machine restarts, the air nozzle of the air cushion machine first inflates the original film for time T1, while the heating wheel of the air cushion machine heats for time T2. Then the heating wheel of the air cushion machine starts to rotate to pull the original film to be conveyed.

[0065] When the air cushion machine restarts, it does not start immediately. Instead, it first inflates the original film for a time T1. This ensures that when the heating wheel pulls the original film after time T1, it can immediately provide stable inflation to the original film, rather than gradually increasing the inflation amount from 0 to 1. On the other hand, pre-inflating the original film first can improve the overall inflation efficiency of the original film. At the same time, the heating wheel is also preheated during time T2 to ensure the temperature stability of subsequent heat sealing.

[0066] In this embodiment, T1 = T2 = 80ms. Pre-inflating the original film for 80ms first can improve the overall inflation efficiency of the original film. When the heating wheel pulls the original film to be conveyed, it can immediately provide stable inflation to the original film. Moreover, during the 80ms pre-inflating time of the original film, the heating wheel also preheats to ensure the temperature stability of subsequent heat sealing. In other embodiments, T1 and T2 may not be equal. When T1 > T2, the heating wheel of the air cushion machine starts to rotate to pull the original film to be conveyed after the time of T1 ends. When T1 < T2, the heating wheel of the air cushion machine starts to rotate to pull the original film to be conveyed after the time of T2 ends.

[0067] The width of the inflation port of each air chamber on the original membrane is L1. In other embodiments, when the heating wheel of the air cushion machine starts to rotate to pull the original membrane to be conveyed, it is ensured that the inflation port of the first air chamber downstream of the sealing line B in step 105 has a width of at least 0.4*L1 that will pass through the inflation nozzle of the air cushion machine for inflation. In this way, when the heating wheel of the air cushion machine starts to rotate to pull the original membrane to be conveyed, the inflation port of the first air chamber downstream of the sealing line B and the inflation nozzle overlap by at least 0.4*L1, ensuring that the inflation nozzle can fill the air chamber.

[0068] In the heat-sealing start / stop method of this invention, when the power switch of the air cushion machine is pressed, the heating wheel of the air cushion machine begins to decelerate at a deceleration rate A. When the sealing line on the original film touches the lever at the inflation nozzle on the air cushion machine, it indicates that a new uninflated air chamber is ready to be inflated. At this time, the controller of the air cushion machine controls the heating wheel to decelerate at a new deceleration rate B. When the linear velocity of the heating wheel decelerates to 0, the sealing line B on the original film is just conveyed to the 0-2cm area near the inflation nozzle on the side of the heat-sealing start position. In this case, the inflation port of the first air chamber downstream of the sealing line B may not be heat-sealed for up to 2cm. The small amount of overflow will not render the air chamber unusable, meeting the minimum inflation requirement of the bubble wrap. When the air cushion machine is started again, the inflation nozzle can completely cover the sealing line. The first air chamber upstream of seal line B is filled; or, when the linear velocity of the heating wheel decelerates to 0, the sealing line B on the original film is just transferred to the area near the heat sealing start position on the side close to the inflation nozzle, which is greater than or equal to 4cm and less than L1. In this case, at least 4cm of the inflation port of the first air chamber downstream of seal line B is not heat-sealed, ensuring that the first air chamber downstream of seal line B has sufficient width to overlap with the inflation nozzle for subsequent inflation. When the air cushion machine starts again, the inflation nozzle can fill the first air chamber downstream of seal line B. In this way, it is ensured that the air cushion machine can produce qualified bubble wrap when it starts again, reducing the probability of defective products, improving the utilization rate of bubble wrap, and reducing cost expenditure.

[0069] Figure 2 The structure of an air cushion machine using the heat-sealing start-stop method of the bubble film of the present invention is schematically shown.

[0070] refer to Figure 2The air cushion machine 100 includes a pair of driven rollers, one of which is a heating roller 110 with a heating effect, and the other is a rubber roller 120. The air cushion machine 100 has a flat opening 130. A lever 140 is hinged in the middle of the air cushion machine 130, with one end of the lever 140 extending out of the air cushion machine 130 and the other end of the lever 140 inserted between the transmitter and receiver of a photoelectric sensor. The photoelectric sensor is installed inside the air cushion machine 130. The air cushion machine 100 carries a roll of raw film 150. The raw film fed from the raw film roll 150 is clamped by the heating roller 110 and the rubber roller 120 after passing through the air cushion machine 130. There are adjacent air chambers distributed on the raw film along its conveying direction, and adjacent air chambers are connected by a sealing line. Next, each air chamber has an inflation port facing the inflation nozzle 130 of the air cushion machine 100. The heating wheel 110 and the rubber wheel 120 press against the inflation port of the original film for heat sealing and simultaneously pull the original film to the left. During the operation of the air cushion machine 100, when the power switch of the air cushion machine 100 is pressed, the air cushion machine 100 controls the heating wheel 110 to start decelerating in deceleration mode A (such as deceleration A), and the original film continues to be transported to the left. When one end of the lever 140 extending out of the inflation nozzle 130 is touched by the sealing line A on the original film, it indicates that a new uninflated air chamber is ready to start inflating. Since the middle part of the lever 140 is hinged in the inflation nozzle 130, the other end of the lever 140 will retract from between the transmitter and receiver of the photoelectric sensor. At this time, the photoelectric sensor... A switch signal is sent to the controller of the air cushion machine 100, and at this time the linear speed of the heating wheel 110 of the air cushion machine 100 is V1. Then the air cushion machine 100 controls the heating wheel 110 to start decelerating in a new deceleration mode B (such as deceleration B). When the linear speed of the heating wheel 110 decelerates to 0, the sealing line B on the original film is just transmitted to the 0-2cm area near the air inlet 130 on the side of the heat sealing start position. In this case, the air inlet of the first air chamber downstream of the sealing line B may not be heat sealed for up to 2cm. The small amount of overflow will not lead to the air chamber being unusable, which meets the minimum air volume requirement of the bubble wrap. When the air cushion machine 100 is started again, the air inlet 130 can completely fill the first air chamber upstream of the sealing line B. Alternatively, when the linear velocity of the heating wheel 110 decelerates to 0, the sealing line B on the original film is just conveyed to the area near the heat-sealing start position on the side close to the air inlet, which is greater than or equal to 4 cm and less than L1. In this case, at least 4 cm of the air inlet of the first air chamber downstream of the sealing line B is not heat-sealed, ensuring that the first air chamber downstream of the sealing line B has sufficient width to overlap with the air inlet 130 for the air inlet 130 to continue inflating it. When the air cushion machine 100 starts up again, the air inlet 130 can fill the first air chamber downstream of the sealing line B. In this way, it is ensured that the air cushion machine 100 can produce qualified bubble wrap when it starts up again, reducing the probability of defective products, improving the utilization rate of bubble wrap, and reducing cost expenditure.

[0071] Figure 3 schematically shown Figure 2 The image shows the state of the paddle being touched by the sealing line on the original film when the air cushion machine is making bubble wrap.

[0072] Figure 4 schematically shown Figure 3 The image shows the state of the heating wheel of the air cushion machine when its linear velocity drops to 0.

[0073] refer to Figure 3 and Figure 4 The original film has a series of air chambers distributed along its conveying direction. In this embodiment, sealing line A and sealing line B are the same sealing line 400. When the linear speed of the heating wheel 110 decelerates to 0, the sealing line 400 on the original film is just conveyed to the starting position of the heat sealing of the original film by the heating wheel. Figure 4 (The state shown).

[0074] Taking two adjacent air chambers A200 and B300 as examples, air chamber A200 is located upstream of air chamber B300, and air chamber B300 is located downstream of air chamber A200. Air chambers A200 and B300 are connected by a sealing line 400. Both air chambers A200 and B300 have inflation ports facing the inflation nozzle 130 of the air cushion machine 100, and the width of the inflation port is L1. Figure 3 As shown), heating wheel 110 and rubber wheel 120 Figure 2 As shown, Figure 3 and Figure 4 (Not shown) The original membrane is pressed and heat-sealed at the air inlet while simultaneously being pulled and transported along the F direction.

[0075] During operation, when the power switch of the air cushion machine 100 is pressed, the air cushion machine 100 controls the heating wheel 110 to decelerate at a speed of A, while the original film continues to be conveyed along the direction F. (Reference) Figure 3 When one end of the protruding inflation nozzle 130 of the lever 140 touches the sealing line 400 on the original membrane, it indicates that the air chamber A200 on the original membrane is ready to start inflation. At this time, the photoelectric sensor sends a switch signal to the controller of the air cushion machine 100, and the linear velocity of the heating wheel 110 of the air cushion machine 100 is V1. Then, the air cushion machine 100 controls the heating wheel 110 to start decelerating at a new deceleration B. When the linear velocity of the heating wheel 110 decelerates to 0, the reference... Figure 4 When the sealing line 400 of the lever 130 is just about to be transmitted to the starting position of the heat sealing of the original film by the heating wheel 110, the linear velocity of the heating wheel 110 drops from V1 to 0. Figure 3 The state shown → Figure 4The time required for the state shown is T3. During the time T3, the distance that the sealing line 400 is transmitted is L2. Moreover, when the sealing line 400 is transmitted to the starting position of the heat sealing of the original film by the heating wheel 110, the length of the overlapping area between the air inlet of the air chamber A200 and the air nozzle 130 is L3 (L3 can be greater than 0.4*L1). In this way, when the heating wheel 110 stops completely (the linear speed of the heating wheel drops to 0), the air chamber B300 downstream of the sealing line 400 has been heat-sealed by the heating wheel 110, and the air inlet of the air chamber A200 upstream of the sealing line 400 also has enough width to overlap with the air nozzle 130 for the air nozzle 130 to continue to inflate it. When the air cushion machine 100 starts again, the air nozzle 130 can fill the air chamber A200 upstream of the sealing line 400.

[0076] refer to Figure 3 and Figure 4 The time required for the linear velocity of the heating wheel to decrease from V1 to 0 is T3. During this time, the distance traveled by the sealing line 400 is L2. According to the deceleration calculation formula, deceleration B = (V1 - 0) / T3, i.e., deceleration B = V1 / T3. V1 can be monitored in real time by the speed sensor installed in the air cushion machine 100. L2 can be measured and recorded in the controller of the air cushion machine 100. Given that L2 and V1 are determined, according to the formula...

[0077] L2=V1*T3-(B*T3 2 ) / 2=V1*T3-{V1 / T3)*T3 2} / 2=V1*T3-(V1*T3) / 2

[0078] = (V1*T3) / 2, we can calculate T3 = (2*L2) / V1, and thus obtain the deceleration.

[0079] B=V1 / T3=V1 / {(2*L2) / V1}=V1 2 / (2*L2) can be used to calculate the deceleration B of the linear velocity of the heating wheel 110 from V1 to 0. In this way, the controller of the air cushion machine 100 can control the linear velocity of the heating wheel 110 to decelerate by the deceleration B.

[0080] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A method for starting and stopping the heat sealing of bubble wrap, characterized in that, Includes the following steps: a. A heating wheel used to make bubble wrap heat-seals the inflated original film at a linear velocity of V; b. When the power switch of the air cushion machine is pressed, the linear speed of the heating wheel begins to decelerate in deceleration mode A, and the original film continues to be conveyed; c. When the sealing line A on the original film touches the lever at the inflation nozzle on the air cushion machine, the linear velocity of the heating wheel is V1. The air cushion machine has a flat, open inflation nozzle. The middle of the lever is hinged into the inflation nozzle, with one end of the lever extending out of the nozzle. The other end of the lever can be inserted between the transmitter and receiver of the photoelectric sensor. When one end of the paddle touches the sealing line A on the original film, the other end of the paddle is pulled out from between the transmitter and receiver of the photoelectric sensor, and the photoelectric sensor sends a switch signal to the controller of the air cushion machine. d. The controller of the air cushion machine controls the linear speed of the heating wheel to decelerate in deceleration mode B; e. When the linear velocity of the heating wheel drops to 0, the sealing line B on the original film is transferred to position C. Taking the starting position of the heat sealing of the original film by the heating wheel as the starting point, the distance from the starting point to position C is L, and the width of the air inlet of each air chamber on the original film is L1. 0≤L≤2cm, when L is not equal to 0, position C is located on the side of the starting point closest to the inflation nozzle on the air cushion machine, or 4cm≤L<L1, position C is located on the side of the starting point closest to the inflation nozzle on the air cushion machine; f. When the air cushion machine restarts, the air nozzle of the air cushion machine first inflates the original film for time T1, while the heating wheel of the air cushion machine heats it for time T2. Then the heating wheel of the air cushion machine starts to rotate to pull the original film to be transported.

2. The heat-sealing start-stop method according to claim 1, characterized in that, The lever is located at the end of the air inlet furthest from the heating wheel.

3. The heat-sealing start-stop method according to claim 1, characterized in that, In step b, deceleration mode A is when the linear velocity of the heating wheel is reduced by deceleration A. In step d, deceleration mode B is when the linear velocity of the heating wheel is reduced by deceleration B, where deceleration B is less than deceleration A.

4. The heat-sealing start-stop method according to claim 3, characterized in that, The sealing line A in step c and the sealing line B in step e are the same sealing line.

5. The heat-sealing start-stop method according to claim 1, characterized in that, In step e, the starting position of the heat sealing of the original film by the heating wheel is: when the heating wheel and the rubber wheel of the air cushion machine are pressed together for heat sealing, the end of the pressing area between the heating wheel and the rubber wheel is closer to the air nozzle.

6. The heat-sealing start-stop method according to claim 1, characterized in that, In step e, 0 ≤ L ≤ 1.5 cm, or 8 cm ≤ L < L1.

7. The heat-sealing start-stop method according to claim 1, characterized in that, In step f, T1=T2=80ms.

8. The heat-sealing start-stop method according to claim 1, characterized in that, In step f, when the heating wheel of the air cushion machine starts to rotate to pull the original film to be conveyed, the air inlet of the first air chamber downstream of the sealing line B has a width of at least 0.4*L1 and passes through the air inlet of the air cushion machine for the air inlet to be inflated.

9. The heat-sealing start-stop method according to claim 4, characterized in that, heating wheel wire The time required for the speed to decrease from V1 to 0 is T3, and the deceleration B = V1 / T3. The distance from the position of the sealing line A in step c, which is transmitted from the position of the lever to the starting position of the heat sealing of the original film by the heating wheel, is L2. L2 = (V1 * T3) / 2, thus the deceleration B = V1 2 / (2*L2).

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