A rubber spreading device for adhesive tape production

Abstract

The application discloses a glue spreading device for adhesive tape production and relates to the technical field of adhesive tape production equipment. The glue spreading device comprises a machine box, a glue spraying mechanism, a glue uniformizing roller, an electric heating roller, and a negative pressure glue suction box. The glue spraying mechanism can spray hot melt adhesive on the upper surface of a strip-shaped base material located in the machine box. The glue uniformizing roller is located at the rear side of the glue spraying mechanism and is adapted with a damping spring. Under the action of the damping spring, the glue uniformizing roller can be pressed and attached to the upper surface of the strip-shaped base material. The electric heating roller is arranged in the machine box and is located above the side of the glue uniformizing roller. The negative pressure glue suction box is arranged in the machine box and is located above the side of the glue uniformizing roller. When glue lumps are attached to the side wall of the glue uniformizing roller, the glue uniformizing roller can compress the damping spring upward, drive the electric heating roller to abut against the side wall of the glue uniformizing roller, move the adsorption port of the negative pressure glue suction box to the side wall of the glue uniformizing roller, and connect the electric heating roller with a power supply and connect the negative pressure glue suction box with a negative pressure source. The glue uniformizing roller with glue lumps can be cleaned online in time.

Description

Technical Field

[0001] This invention relates to the field of tape production equipment technology, and more specifically to a tape application device for tape production. Background Technology

[0002] Commonly used adhesive tapes are hot-melt tapes, which are products made by applying hot-melt adhesive to a strip substrate. In the production process, a gluing machine or other adhesive application device is used to apply the adhesive to the substrate and cool it. The tape is then rolled into a master roll and slit into smaller rolls of varying sizes by a slitting machine to form the final product. In existing technologies, adhesive is mostly applied to the strip substrate using a combination of transfer rollers and / or coating rollers. Some products also incorporate a leveling roller. While this effectively applies the adhesive to the substrate, environmental factors and heat exchange with the strip substrate cause adhesive clumps to form on the transfer rollers, coating rollers, and leveling rollers after a period of production, affecting the uniformity of adhesive application.

[0003] To address the aforementioned issues, the current practice is to install scrapers at specific locations to ensure the proper functioning of the corresponding rubber rollers. However, after prolonged use, these scrapers wear down significantly and require timely replacement. Unfortunately, there are instances where scraper replacement is delayed, necessitating machine downtime and disrupting normal production. Summary of the Invention

[0004] To address the technical problems of untimely scraper replacement and the need for machine shutdown to replace scrapers in existing adhesive tape production equipment, this invention provides an adhesive tape production device that directly sprays hot-melt adhesive onto a strip-shaped substrate through a nozzle, and then uses a spreading roller to evenly distribute the adhesive. Furthermore, it can promptly clean the spreading roller containing adhesive clumps online without requiring machine shutdown for maintenance, ensuring continuous production and thus improving tape production efficiency.

[0005] This invention is achieved through the following technical solution:

[0006] This invention provides a tape application device for tape production, comprising: a housing with an inlet and an outlet on both sides along its length for a strip-shaped substrate to pass through; a glue spraying mechanism disposed within the housing, capable of spraying hot-melt adhesive onto the upper surface of the strip-shaped substrate located within the housing; a glue-spreading roller disposed within the housing, along the feeding direction of the strip-shaped substrate, located behind the glue spraying mechanism, and equipped with a damping spring, capable of pressing against the upper surface of the strip-shaped substrate under the action of the damping spring; an electric heating roller disposed within the housing, located above and to the side of the glue-spreading roller; and a negative pressure glue suction box disposed within the housing, located above and to the side of the glue-spreading roller; wherein, when glue clumps adhere to the side wall of the glue-spreading roller, the glue-spreading roller can compress the damping spring upwards, driving the electric heating roller to abut against the side wall of the glue-spreading roller, and the suction port of the negative pressure glue suction box to move toward the side wall of the glue-spreading roller, and connecting the electric heating roller to a power source and the negative pressure glue suction box to a negative pressure source.

[0007] The adhesive application device for tape production provided by this invention has an inlet and an outlet on both sides of the machine casing along its length for the strip-shaped substrate to pass through. Inside the machine casing are a spraying mechanism, a spreading roller, an electric heating roller, and a negative pressure suction box. The spraying mechanism sprays hot-melt adhesive onto the upper surface of the strip-shaped substrate located inside the machine casing. The spreading roller is located behind the spraying mechanism and is equipped with a damping spring, which can evenly distribute the hot-melt adhesive sprayed onto the strip-shaped substrate by the spraying mechanism. The hot roller is located above and to the side of the spreading roller, and the negative pressure suction box is located above and to the side of the spreading roller. Under normal working conditions, there is no glue clump on the spreading roller, and it is pressed against the upper surface of the strip substrate under the action of the damping spring. The strip substrate moves from the feed port to the discharge port in the machine box under the winding of the rewinding roller. The glue spraying mechanism can spray the hot melt adhesive onto the upper surface of a section of the strip substrate inside the machine box, and then press it evenly by the spreading roller, so that the hot melt adhesive can be evenly distributed on the strip substrate.

[0008] When there are adhesive clumps on the spin coater roller, the clumps cannot be pressed off, and the strip substrate remains taut against the underside of the spin coater roller. Under the action of the clumps, the spin coater roller is pushed upwards, compressing the damping spring. This drives the heated roller to press against the side wall of the spin coater roller, and the suction port of the negative pressure suction box moves towards the side wall of the spin coater roller. Simultaneously, the heated roller is connected to the power supply, and the negative pressure suction box is connected to a negative pressure source. After being connected to the power supply, the temperature of the heated roller rises, and it rotates under the drive of the spin coater roller, heating it. This causes the adhesive clumps on the spin coater roller to fuse into a liquid. Then, the negative pressure in the negative pressure suction box draws away the excess liquid hot melt adhesive, achieving the effect of cleaning the spin coater roller and enabling timely online cleaning. The excess liquid hot melt adhesive is drawn away by the negative pressure suction box, preventing any impact on the uniformity of the hot melt adhesive on the strip substrate.

[0009] The process involves using a glue ball to push the glue-spreading roller upwards and compress the damping spring, thereby driving the heating roller to contact the side wall of the glue-spreading roller and the suction port of the negative pressure suction box to move towards the side wall of the glue-spreading roller. This ensures that the initial distance between the glue-spreading roller and the corresponding heating roller is the sum of the upward movement distance of the glue-spreading roller and the downward movement distance of the heating roller, and the initial distance between the glue-spreading roller and the negative pressure suction box is the sum of the upward movement distance of the glue-spreading roller and the downward movement distance of the negative pressure suction box. This ensures that under normal operating conditions, there is sufficient clearance between the glue-spreading roller and the heating roller and the negative pressure suction box, preventing the heating roller and the negative pressure suction box from affecting the normal operation of the glue-spreading roller.

[0010] In summary, the adhesive application device provided by this invention can evenly apply hot melt adhesive to a strip substrate and can promptly clean the applicator roller containing adhesive clumps online without requiring machine downtime for maintenance, thus ensuring continuous production and improving the production efficiency of the tape.

[0011] In an optional embodiment, the chassis is further provided with a triggering mechanism, which includes: a glue-spreading slide rod, slidably connected to the chassis and capable of sliding up and down; a damping spring sleeved on the outside of the glue-spreading slide rod; and a glue-spreading roller disposed at the lower end of the glue-spreading slide rod; a micro switch disposed above the glue-spreading slide rod, which, when the glue-spreading slide rod moves upward and actuates, connects the heating roller to a power source and the negative pressure glue-absorbing box to a negative pressure source; a heating slide rod, slidably connected to the chassis and capable of sliding up and down; and a heating roller disposed at the lower end of the heating slide rod; and a first connecting rod, one end of which is drivenly connected to the glue-spreading slide rod, and the middle part connected to the inner side wall of the chassis. The first rod is hinged to the second rod, with one end connected to the heating slide rod and the other end connected to the heating slide rod. The second rod is slidably connected to the glue-spreading slide rod and can slide up and down. The negative pressure glue-spreading box is located at the lower end of the glue-spreading slide rod. The third rod is hinged to the inner side wall of the chassis and the other end is connected to the glue-spreading slide rod. When the glue-spreading roller compresses the damping spring upward, the heating slide rod and the glue-spreading slide rod slide downward simultaneously. This causes the heating roller to abut against the side wall of the glue-spreading roller and the suction port of the negative pressure glue-spreading box to move toward the side wall of the glue-spreading roller when the glue-spreading roller compresses the damping spring upward. The heating roller is connected to the power supply and the negative pressure glue-spreading box is connected to the negative pressure source.

[0012] In an optional embodiment, the distance from the hinge point of the first connecting rod to the heating slide rod is greater than the distance to the evenly coated slide rod, so that the distance the heating slide rod slides downward is greater than the distance the evenly coated slide rod slides upward, ensuring that there is sufficient gap between the heating roller and the evenly coated roller under normal operating conditions.

[0013] In an optional embodiment, the distance from the hinge point of the second connecting rod to the suction slide bar is greater than the distance to the evenly distributing slide bar, so that the suction slide bar slides downward a greater distance than the evenly distributing slide bar slides upward, ensuring that there is sufficient gap between the negative pressure suction box and the evenly distributing roller under normal operating conditions.

[0014] In an optional embodiment, the first connecting rod has a first elongated hole and a second elongated hole at both ends, both extending along the length of the first connecting rod; the upper end of the glue-spreading slide rod is provided with a first pin, the rod portion of the first pin being disposed in the first elongated hole, and the first pin being able to slide along the length of the first elongated hole; the upper end of the heating slide rod is provided with a second pin, one end of the second pin being inserted into the second elongated hole, and the second pin being able to slide along the length of the second elongated hole, so as to ensure that when the glue-spreading roller compresses the damping spring upward, the heating slide rod slides downward simultaneously.

[0015] In an optional embodiment, the second connecting rod has a third elongated hole and a fourth elongated hole at both ends, both extending along the length of the second connecting rod; the rod portion of the first pin is inserted into the third elongated hole, and the first pin can slide along the length of the third elongated hole; the upper end of the adhesive suction slide rod is provided with a third pin, one end of which is inserted into the fourth elongated hole, and the third pin can slide along the length of the fourth elongated hole, so as to ensure that when the glue-spreading roller compresses the damping spring upward, the adhesive suction slide rod slides downward simultaneously.

[0016] In an optional embodiment, along the feeding direction of the strip substrate, the negative pressure suction box is located in front of the heating roller, so that after the heating roller heats up the excess hot melt adhesive, a portion of it is sucked away by the negative pressure suction box before the evenly spreading roller contacts the strip substrate again, while the excess hot melt adhesive that is not sucked away flows back to the subsequent strip substrate, thus avoiding affecting the uniformity of the hot melt adhesive on the strip substrate.

[0017] In an optional embodiment, the negative pressure adhesive suction box includes a hollow box body. The side of the box body facing the glue-spreading roller is provided with an adhesive suction slit that communicates with the inner cavity of the box body. The length direction of the adhesive suction slit is parallel to the axial direction of the glue-spreading roller, so as to suck excess hot melt adhesive from the surface of the glue-spreading roller into the box body through the adhesive suction slit.

[0018] In an optional embodiment, a scraper is provided on the lower side of the adhesive suction slit, and the scraper is slidably connected to the body of the negative pressure adhesive suction box; a retaining spring is provided between the scraper and the body of the negative pressure adhesive suction box, and the retaining spring can push the scraper towards the adhesive spreading roller; the scraper is provided with a first magnetic strip, and a plurality of second magnetic strips are evenly distributed on the inner circumference of the adhesive spreading roller, the first magnetic strip and the second magnetic strips have the same magnetic pole, so that under the action of the repulsive force of the first magnetic strip and the second magnetic strip, there is always a gap between the lower side of the scraper and the surface of the adhesive spreading roller.

[0019] By setting a scraper, excess hot-melt adhesive on the spreading roller can be scraped into a pile, making it easier for negative pressure to draw it into the negative pressure suction box. The clamping spring pushes the scraper against the spreading roller, and the repulsive force of the first and second magnetic strips ensures that there is always a gap between the lower side of the scraper and the surface of the spreading roller, avoiding direct contact between the scraper and the spreading roller. On the one hand, this avoids wear on the scraper and the spreading roller, and on the other hand, it ensures that the surface of the spreading roller retains a certain thickness of hot-melt adhesive, without taking away too much hot-melt adhesive from the strip substrate. This saves hot-melt adhesive while ensuring product quality.

[0020] In an optional embodiment, the glue spraying mechanism includes a plurality of glue spraying heads, which are spaced apart along the width direction of the chassis. The glue spraying heads are made of metal and are fitted with induction heating coils to heat the glue spraying heads in real time, thereby preventing the glue spraying heads from overheating and causing the hot melt adhesive to clump and solidify, which would lead to clogging of the glue spraying heads.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects.

[0022] The adhesive application device for tape production provided by this invention has an inlet and an outlet on both sides of the machine casing along its length for the strip substrate to pass through. Inside the machine casing are a spraying mechanism, a spreading roller, a heating roller, and a negative pressure suction box. The spraying mechanism sprays hot-melt adhesive onto the upper surface of the strip substrate located inside the machine casing. The spreading roller is located behind the spraying mechanism and is equipped with a damping spring to evenly distribute the hot-melt adhesive sprayed onto the strip substrate. The heating roller and the negative pressure suction box are located above and to the side of the spreading roller. Under normal operating conditions, the spreading roller is free of adhesive clumps and, under the action of the damping spring, presses against the upper surface of the strip substrate. The strip substrate is then wound up by the rewinding roller... The machine housing moves from the inlet to the outlet. The glue spraying mechanism sprays hot melt adhesive onto the upper surface of a section of the strip substrate inside the machine housing. Then, the adhesive is spread evenly by the glue-spreading roller, ensuring that the hot melt adhesive is evenly distributed on the strip substrate. When there are clumps of adhesive on the glue-spreading roller, the roller pushes upward and compresses the damping spring, thereby driving the heating roller to contact the side wall of the glue-spreading roller. The suction port of the negative pressure suction box moves towards the side wall of the glue-spreading roller. At the same time, the heating roller is connected to the power supply and the negative pressure suction box is connected to the negative pressure source to heat the glue-spreading roller and remove excess liquid hot melt adhesive. This achieves timely online cleaning of the glue-spreading roller without the need for machine downtime maintenance, ensuring continuous production and improving the production efficiency of the tape. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] In the attached diagram:

[0025] Figure 1 This is a schematic diagram of the adhesive application device for tape production according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A magnified structural diagram of part A;

[0027] Figure 3 for Figure 1 A magnified structural diagram of part B.

[0028] The attached diagram shows the markings and corresponding component names:

[0029] 10-Chassis, 20-Glue spraying mechanism, 21-Glue spraying head, 22-Induction heating coil, 30-Glue spreading roller, 31-Second magnetic strip, 40-Heating roller, 50-Negative pressure glue suction box, 51-Box body, 52-Glue suction slit, 53-Scraper, 54-Pressure spring, 55-First magnetic strip, 60-Triggering mechanism, 61-Glue spreading slide bar, 61a-First pin, 62-Damping spring, 63-Micro switch, 64-Heating slide bar, 64a-Second pin, 65-First connecting rod, 65a-First elongated hole, 65b-Second elongated hole, 66-Glue suction slide bar, 66a-Third pin, 67-Second connecting rod, 67a-Third elongated hole, 67b-Fourth elongated hole, 70-Support roller, 80-Strip substrate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0032] Meanwhile, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Example:

[0034] Combination Figure 1This embodiment provides a tape application device for tape production, comprising: a housing 10, with an inlet and an outlet on both sides along its length for a strip substrate 80 to pass through; a glue spraying mechanism 20, disposed within the housing 10, capable of spraying hot melt adhesive onto the upper surface of the strip substrate 80 located within the housing 10; and a glue-spreading roller 30, disposed within the housing 10, along the feeding direction of the strip substrate 80, located behind the glue spraying mechanism 20, and equipped with a damping spring 62, capable of pressing against the upper surface of the strip substrate 80 under the action of the damping spring 62. The surface includes: an electric heating roller 40 disposed inside the housing 10 and located above and to the side of the leveling roller 30; and a negative pressure suction box 50 disposed inside the housing 10 and located above and to the side of the leveling roller 30. When adhesive clumps adhere to the side wall of the leveling roller 30, the leveling roller 30 can compress the damping spring 62 upwards, driving the electric heating roller 40 to abut against the side wall of the leveling roller 30, and the suction port of the negative pressure suction box 50 to move towards the side wall of the leveling roller 30. The electric heating roller 40 is connected to a power source, and the negative pressure suction box 50 is connected to a negative pressure source.

[0035] Understandably, the inner cavity of the chassis 10 serves as the spraying operation room for hot melt adhesives, preventing the adhesives from escaping into the air. At the same time, the chassis 10 is equipped with a heater to heat the air inside, preventing the hot melt adhesives from forming without being evenly pressed. The bottom of the chassis 10 is provided with a collection tank to collect excess hot melt adhesives sprayed by the glue spraying mechanism 20 and squeezed out by the blending roller 30.

[0036] Continue to combine Figure 1 The glue spraying mechanism 20 only needs to be able to spray hot melt adhesive onto the strip substrate 80, and typically includes a pressure pump, a spray head, and corresponding connecting pipes. In this embodiment, the glue spraying mechanism 20 includes multiple glue spray heads 21, which are spaced apart along the width direction of the housing 10. The glue spray heads 21 are made of metal, and each glue spray head 21 is fitted with an induction heating coil 22 to heat the glue spray head 21 in real time, preventing the glue spray head 21 from overheating and causing the hot melt adhesive to clump and solidify, thus preventing the glue spray head 21 from becoming clogged.

[0037] Among them, the electric heating roller 40 can heat up quickly when connected to a power source, and only requires a resistance heating wire with a set power. The negative pressure suction box 50 needs to be equipped with a corresponding negative pressure source (usually a negative pressure pump), and the switch of the negative pressure pump can be directly linked to the glue-spreading roller 30.

[0038] Combination Figure 2Specifically, the chassis 10 is further provided with a triggering mechanism 60, which includes: a glue-spreading slide rod 61, which is slidably connected to the chassis 10 and can slide up and down; a damping spring 62 is sleeved on the glue-spreading slide rod 61; a glue-spreading roller 30 is disposed at the lower end of the glue-spreading slide rod 61; a micro switch 63 is disposed above the glue-spreading slide rod 61, which, when the glue-spreading slide rod 61 moves upward and actuates, can connect the heating roller 40 to the power supply and the negative pressure suction box 50 to the negative pressure source; a heating slide rod 64, which is slidably connected to the chassis 10 and can slide up and down; the heating roller 40 is disposed at the lower end of the heating slide rod 64; and a first connecting rod 65, one end of which is drivenly connected to the glue-spreading slide rod 61, and the middle part is hinged to the inner wall of the chassis 10. The other end is connected to the heating slide rod 64; the glue suction slide rod 66 is slidably connected to the housing 10 and can slide up and down, and the negative pressure glue suction box 50 is located at the lower end of the glue suction slide rod 66; the second connecting rod 67 is connected to the glue leveling slide rod 61 at one end, hinged to the inner side wall of the housing 10 in the middle, and connected to the glue suction slide rod 66 at the other end; so that when the glue leveling roller 30 compresses the damping spring 62 upward, the heating slide rod 64 and the glue suction slide rod 66 slide downward simultaneously, so that when the glue leveling roller 30 compresses the damping spring 62 upward, the electric heating roller 40 abuts against the side wall of the glue leveling roller 30, the suction port of the negative pressure glue suction box 50 moves toward the side wall of the glue leveling roller 30, and connects the electric heating roller 40 to the power supply and the negative pressure glue suction box 50 to the negative pressure source.

[0039] It should be understood that, under the action of the glue ball, the leveling roller 30 is pushed upward and the damping spring 62 is compressed, thereby driving the heating roller 40 to abut against the side wall of the leveling roller 30, and the suction port of the negative pressure suction box 50 to move towards the side wall of the leveling roller 30. This ensures that the initial distance between the leveling roller 30 and the corresponding heating roller 40 is the sum of the upward movement distance of the leveling roller 30 and the downward movement distance of the heating roller 40, and the initial distance between the leveling roller 30 and the negative pressure suction box 50 is the sum of the upward movement distance of the leveling roller 30 and the downward movement distance of the negative pressure suction box 50. This ensures that under normal working conditions, there is sufficient distance between the leveling roller 30 and the heating roller 40 and the negative pressure suction box 50, preventing the heating roller 40 and the negative pressure suction box 50 from affecting the normal operation of the leveling roller 30.

[0040] Furthermore, the distance from the hinge point of the first connecting rod 65 to the heating slide rod 64 is greater than the distance to the evenly coated slide rod 61, so that the distance the heating slide rod 64 slides downward is greater than the distance the evenly coated slide rod 61 slides upward, ensuring that there is sufficient gap between the heating roller 40 and the evenly coated roller 30 under normal operating conditions.

[0041] Correspondingly, the distance from the hinge point of the second connecting rod 67 to the glue suction slide 66 is greater than the distance to the glue spreading slide 61, so that the distance the glue suction slide 66 slides downward is greater than the distance the glue spreading slide 61 slides upward, ensuring that there is sufficient gap between the negative pressure glue suction box 50 and the glue spreading roller 30 under normal working conditions.

[0042] In this embodiment, the first connecting rod 65 has a first elongated hole 65a and a second elongated hole 65b at both ends, and both the first elongated hole 65a and the second elongated hole 65b extend along the length direction of the first connecting rod 65; the upper end of the glue-spreading slide rod 61 is provided with a first pin 61a, the rod part of the first pin 61a is located in the first elongated hole 65a, and the first pin 61a can slide along the length direction of the first elongated hole 65a; the upper end of the heating slide rod 64 is provided with a second pin 64a, one end of the second pin 64a is inserted in the second elongated hole 65b, and the second pin 64a can slide along the length direction of the second elongated hole 65b, so as to ensure that when the glue-spreading roller 30 compresses the damping spring 62 upward, the heating slide rod 64 slides downward at the same time.

[0043] Similarly, the second connecting rod 67 has a third elongated hole 67a and a fourth elongated hole 67b at both ends, both of which extend along the length of the second connecting rod 67. The rod portion of the first pin 61a is inserted into the third elongated hole 67a, and the first pin 61a can slide along the length of the third elongated hole 67a. The upper end of the adhesive suction slide rod 66 is provided with a third pin 66a, one end of which is inserted into the fourth elongated hole 67b, and the third pin 66a can slide along the length of the fourth elongated hole 67b, so as to ensure that when the glue-spreading roller 30 compresses the damping spring 62 upward, the adhesive suction slide rod 66 slides downward simultaneously.

[0044] Generally, bearings are fitted on the rods corresponding to the first pin 61a, the second pin 64a and the third pin 66a to convert the friction between the pin and the wall of the elongated hole into rolling friction, so as to ensure that the triggering mechanism 60 has sufficient sensitivity and improve the service life of the triggering mechanism 60.

[0045] Preferably, along the feeding direction of the strip substrate 80, the negative pressure suction box 50 is located in front of the electric heating roller 40, so that after the electric heating roller 40 heats up the excess hot melt adhesive, a portion of it is sucked away by the negative pressure suction box 50 before the evenly applying roller 30 contacts the strip substrate 80 again, while the excess hot melt adhesive that is not sucked away flows back to the subsequent strip substrate 80, thus avoiding affecting the uniformity of the hot melt adhesive on the strip substrate 80.

[0046] Combination Figure 3 The negative pressure adhesive suction box 50 includes a hollow box body 51. The side of the box body 51 facing the glue-spreading roller 30 is provided with an adhesive suction slit 52 that communicates with the inner cavity of the box body 51. The length direction of the adhesive suction slit 52 is parallel to the axial direction of the glue-spreading roller 30, so that excess hot melt adhesive on the surface of the glue-spreading roller 30 is sucked into the box body 51 through the adhesive suction slit 52.

[0047] Based on this, a scraper 53 is provided on the lower side of the adhesive suction slit 52, and the scraper 53 is slidably connected to the box body 51 of the negative pressure adhesive suction box 50; a retaining spring 54 is provided between the scraper 53 and the box body 51 of the negative pressure adhesive suction box 50, and the retaining spring 54 can push the scraper 53 towards the glue-spreading roller 30; the scraper 53 is provided with a first magnetic strip 55, and a plurality of second magnetic strips 31 are evenly distributed on the inner circumference of the glue-spreading roller 30. The first magnetic strip 55 and the second magnetic strips 31 have the same magnetic pole, so that under the action of the repulsive force of the first magnetic strip 55 and the second magnetic strips 31, there is always a gap between the lower side of the scraper 53 and the surface of the glue-spreading roller 30.

[0048] By setting the scraper 53, excess hot melt adhesive on the spreading roller 30 can be scraped into a pile, which is then drawn into the negative pressure suction box 50 by negative pressure. The clamping spring 54 can push the scraper 53 against the spreading roller 30. Under the repulsive force of the first magnetic strip 55 and the second magnetic strip 31, there is always a gap between the lower side of the scraper 53 and the surface of the spreading roller 30, so as to avoid direct contact between the scraper 53 and the spreading roller 30. On the one hand, this can avoid wear on the scraper 53 and the spreading roller 30. On the other hand, it can also ensure that the surface of the spreading roller 30 retains a certain thickness of hot melt adhesive, without taking away too much hot melt adhesive from the strip substrate. This saves hot melt adhesive while ensuring product quality.

[0049] In addition, to ensure that the triggering mechanism can work properly, a support roller 70 is provided directly below the glue-spreading roller 30 to support the strip substrate 80.

[0050] It should be noted that, under normal operating conditions, the adhesive application device for tape production provided in this embodiment has no adhesive lumps on the glue-spreading roller 30 and is in contact with the upper surface of the strip substrate 80 under the action of the damping spring 62, and is supported by the support roller 80. The strip substrate 80 moves from the feed port to the discharge port in the machine housing 10 under the winding of the rewinding roller. The glue spraying mechanism 20 can spray the hot melt adhesive onto the upper surface of a section of the strip substrate inside the machine housing 10, and then press it evenly by the glue-spreading roller 30, so that the hot melt adhesive can be evenly distributed on the strip substrate.

[0051] When there are glue clumps on the spreading roller 30, the glue clumps cannot be pressed off. The strip substrate 80 is taut and stretched under the spreading roller 30 by the support roller 70. Thus, under the action of the glue clumps, the spreading roller 30 is pushed upward (the support roller 70 provides a reaction force) and the damping spring 62 is compressed, thereby driving the heating roller 40 to abut against the side wall of the spreading roller 30, and the suction port of the negative pressure suction box 50 to move towards the side wall of the spreading roller 30. At the same time, the heating roller 40 is connected to the power supply and the negative pressure suction box 50 is connected to the negative pressure source. The heating roller 40 heats up after being connected to the power supply and rotates under the drive of the spreading roller 30, heating the spreading roller 30 and thus fusing the adhesive clumps on the spreading roller 30 into a liquid. The scraper 53 is suspended outside the spreading roller 30 at a set interval and can scrape off excess hot melt adhesive on the spreading roller 30. Then, the negative pressure in the negative pressure suction box 50 sucks away the excess liquid hot melt adhesive, thus cleaning the spreading roller 30 and achieving timely online cleaning of the spreading roller 30. The excess liquid hot melt adhesive being sucked away by the negative pressure suction box 50 can avoid affecting the uniformity of the hot melt adhesive on the strip substrate.

[0052] In summary, the adhesive application device provided in this embodiment can evenly apply hot melt adhesive to the strip substrate and can promptly clean the applicator roller containing adhesive clumps online without requiring machine downtime for maintenance, thus ensuring continuous production and improving the production efficiency of the tape.

[0053] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tape-applying device for tape production, characterized in that, include: The chassis (10) has an inlet and an outlet on both sides along its length for the strip substrate to pass through. The adhesive spraying mechanism (20) is installed inside the housing (10) and is capable of spraying hot melt adhesive onto the upper surface of the strip substrate located inside the housing (10); The glue-spraying roller (30) is located inside the machine housing (10) along the feeding direction of the strip substrate, behind the glue spraying mechanism (20), and is equipped with a damping spring (62). Under the action of the damping spring (62), it can press against the upper surface of the strip substrate. The electric heating roller (40) is disposed inside the housing (10) and located above and to the side of the coating roller (30); The negative pressure suction box (50) is disposed inside the machine housing (10) and located above the side of the glue-spreading roller (30); When glue clumps are attached to the side wall of the glue-spreading roller (30), the glue-spreading roller (30) can compress the damping spring (62) upwards, and drive the electric heating roller (40) to abut against the side wall of the glue-spreading roller (30), and the suction port of the negative pressure glue suction box (50) moves toward the side wall of the glue-spreading roller (30), and connect the electric heating roller (40) to the power source and connect the negative pressure glue suction box (50) to the negative pressure source; The chassis (10) is also provided with a trigger mechanism (60), the trigger mechanism (60) including: The glue-spreading slide bar (61) is slidably connected to the housing (10) and can slide up and down. The damping spring (62) is sleeved on the outside of the glue-spreading slide bar (61) and the glue-spreading roller (30) is located at the lower end of the glue-spreading slide bar (61). A micro switch (63) is located above the glue-spreading slide bar (61). When the glue-spreading slide bar (61) moves upward and is actuated, it can connect the heating roller (40) to the power source and connect the negative pressure glue-absorbing box (50) to the negative pressure source. Heating slide bar (64) is slidably connected to the housing (10) and can slide up and down. The electric heating roller (40) is located at the lower end of the heating slide bar (64). The first connecting rod (65) is connected to the glue-spreading slide rod (61) at one end, hinged to the inner wall of the chassis (10) in the middle, and connected to the heating slide rod (64) at the other end. The adhesive suction slide (66) is slidably connected to the chassis (10) and can slide up and down. The negative pressure adhesive suction box (50) is located at the lower end of the adhesive suction slide (66). The second connecting rod (67) is connected to the glue-spreading slide rod (61) at one end, hinged to the inner wall of the chassis (10) in the middle, and connected to the glue-absorbing slide rod (66) at the other end. When the glue-spreading roller (30) compresses the damping spring (62) upward, the heating slide rod (64) and the glue-absorbing slide rod (66) slide downward simultaneously.

2. The tape-applying device for tape production according to claim 1, characterized in that, The distance from the hinge point of the first connecting rod (65) to the heating slide rod (64) is greater than the distance to the glue-spreading slide rod (61).

3. The tape-applying device for tape production according to claim 2, characterized in that, The distance from the hinge point of the second connecting rod (67) to the adhesive suction slide (66) is greater than the distance to the adhesive spreading slide (61).

4. The tape-applying device for tape production according to claim 1, characterized in that, The first connecting rod (65) has a first elongated hole (65a) and a second elongated hole (65b) at both ends, and both the first elongated hole (65a) and the second elongated hole (65b) extend along the length direction of the first connecting rod (65). The upper end of the glue-spreading slide bar (61) is provided with a first pin (61a), the rod part of the first pin (61a) is located in the first elongated hole (65a), and the first pin (61a) can slide along the length direction of the first elongated hole (65a). The upper end of the heating slide rod (64) is provided with a second pin (64a), one end of which is inserted into the second elongated hole (65b), and the second pin (64a) can slide along the length direction of the second elongated hole (65b).

5. The tape-applying device for tape production according to claim 4, characterized in that, The second connecting rod (67) has a third elongated hole (67a) and a fourth elongated hole (67b) at both ends, and the third elongated hole (67a) and the fourth elongated hole (67b) both extend along the length direction of the second connecting rod (67). The rod portion of the first pin (61a) is inserted into the third elongated hole (67a), and the first pin (61a) can slide along the length direction of the third elongated hole (67a). The upper end of the adhesive suction slide bar (66) is provided with a third pin (66a), one end of which is inserted into the fourth elongated hole (67b), and the third pin (66a) can slide along the length direction of the fourth elongated hole (67b).

6. The tape-applying device for tape production according to any one of claims 1 to 5, characterized in that, Along the feeding direction of the strip substrate, the negative pressure adhesive suction box (50) is located in front of the electric heating roller (40).

7. The tape-applying device for tape production according to claim 6, characterized in that, The negative pressure adhesive suction box (50) includes a hollow box body (51). The side of the box body (51) facing the adhesive roller (30) is provided with an adhesive suction slit (52) that communicates with the inner cavity of the box body (51). The length direction of the adhesive suction slit (52) is parallel to the axial direction of the adhesive roller (30).

8. The tape-applying device for tape production according to claim 7, characterized in that, A scraper (53) is provided on the lower side of the adhesive absorption seam (52), and the scraper (53) is slidably connected to the box body (51) of the negative pressure adhesive absorption box (50). A retaining spring (54) is provided between the scraper (53) and the box body (51) of the negative pressure adhesive suction box (50), and the retaining spring (54) can push the scraper (53) against the adhesive roller (30). The scraper (53) is provided with a first magnetic strip (55), and a plurality of second magnetic strips (31) are evenly distributed on the inner circumference of the glue-spreading roller (30). The first magnetic strip (55) and the second magnetic strip (31) have the same magnetic poles, so that under the repulsive force of the first magnetic strip (55) and the second magnetic strip (31), there is always a gap between the lower side of the scraper (53) and the surface of the glue-spreading roller (30).

9. The tape-applying device for tape production according to claim 1, characterized in that, The glue spraying mechanism (20) includes a plurality of glue spraying heads (21), which are spaced apart along the width direction of the chassis (10); The glue spray head (21) is made of metal, and an induction heating coil (22) is provided on the outer sleeve of the glue spray head (21).

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