Preparation method of dustproof zipper of automobile seat slide rail

Abstract

The preparation method of the dustproof zipper of the automobile seat slide rail comprises the following steps: preparing the dustproof plate; preparing a zipper strip; preparing a dustproof zipper finished product, enabling the dustproof plates to move towards a station where a high-frequency welding machine is located through a traction device or a conveying device in the state that the dustproof plates are arranged in pairs and a distance is kept, and enabling a pair of coiled zipper belts to move towards the station where the high-frequency welding machine is located through the traction device, the surface, provided with the TPU layer, of the edge portion of the side, deviating from the zipper teeth, of the pair of zipper belts is in contact with the lower portion between the opposite sides of the pair of dustproof plates in an attached mode. The lower surfaces of the opposite sides of the pair of dustproof plates in the length direction and the edge portions of the zipper strips with the surfaces of the TPU layers in the length direction are welded into a whole through a high-frequency welding machine, cutting is conducted according to needs through the high-frequency welding machine, a zipper head is installed, and the dustproof zipper is obtained. The method has the advantages that the waterproof and dustproof effects of zipper teeth are guaranteed, energy loss is reduced, preparation efficiency is improved, and quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automobile seat accessory preparation, and particularly relates to a preparation method of a dustproof zipper of an automobile seat slide rail. BACKGROUND

[0002] The aforementioned automobile seat slide rail refers to a lower slide rail, which is also called an outer slide rail or a static slide rail. The upper slide rail (also called "inner slide rail" or "dynamic slide rail") of the automobile seat forms a sliding pair with the lower slide rail. As known in the industry, the screw, ball or ball retainer usually provided inside the lower slide rail of the automobile seat is a precision transmission component for the forward and backward adjustment of the automobile seat. Foreign matter such as dust, sand, hair and even water intrusion into the inside of the lower slide rail will mix with the grease inside the lower slide rail for protecting the smooth operation of the screw, ball or ball retainer to form a "abrasive paste effect" substance, resulting in increased sliding resistance, producing abnormal noises such as squeaking and jamming, and even causing a jamming situation, which affects the forward and backward adjustment function of the automobile seat. The zipper with dustproof and waterproof functions is the key or important defense line to ensure smooth movement throughout the vehicle life cycle. In addition, in addition to the function of preventing foreign matter from invading, the zipper provided for the lower slide rail of the automobile seat also has the following positive significance: preventing corrosion and wear, for example, in a humid or high-salt environment, dust with moisture can accelerate the electrochemical corrosion of the internal components of the slide rail; improving the durability of the slide rail, prolonging the service life of the entire seat slide rail assembly; improving the user's good experience effect, because a quiet, smooth and silky adjustment feel is a manifestation of high-quality interior parts, and the like.

[0003] It is the zipper of the automobile seat slide rail that has the aforementioned advantages, not limited to the foregoing, and thus its configuration on luxury cars such as Mercedes-Benz S-class, BMW 7-series, Audi A8, luxury SUV (Porsche, Land Rover Discovery), high-end MPV (Toyota Alphard, Lexus LM), etc. has become the industry consensus. In particular, it is currently expanding to commercial vehicles (such as high-end trucks, long-distance buses), taxis, rental cars, pick-ups, etc., because the use scenarios of such vehicles often involve non-paved roads, sandy land, soil and other relatively harsh external environments, the risk of dust and mud intrusion is much higher than that of ordinary road vehicles, so the protection level requirements for various components including the seat slide rail are also higher.

[0004] As mentioned above, dustproof zippers serve as a barrier to protect car seat rails and are increasingly considered an indispensable standard feature in the industry. Although technical information related to dustproof zippers for car seat rails can be found in published Chinese patent documents, such as CN217791730U (zipper structure for seat rails) and CN222891913U (a waterproof and dustproof zipper for long vehicle seat rails), no technical information regarding the manufacturing method or processing technology of dustproof zippers has been found in any published Chinese or foreign patent and non-patent documents to date.

[0005] As automotive parts manufacturing continues to evolve towards intelligent and efficient processes, the automated assembly of dustproof zippers onto the sliding rails of car seats has become a key focus for modern car seat manufacturers. Theoretically, the general process flow might be as follows: rail positioning, zipper assembly (i.e., the aforementioned dustproof zipper feeding), automated assembly and fixing, and online inspection and quality control. The aforementioned zipper assembly feeding should involve supplying pre-produced dustproof zipper assemblies, cut to standard lengths (i.e., lengths compatible with the car seat sliding rails) and with zipper heads installed, in the form of a tray or bin. A robot then picks up and releases these assemblies above the car seat sliding rails.

[0006] Existing technologies typically use hot air welding to weld the zipper strips to a fixing plate, also known as a dustproof plate, which serves as the base material or carrier. Specifically, a pair of zipper strips (equipped with zipper heads that are connected to and driven by the upper slide rail) with zipper teeth on opposite sides and fixed at the base or one end are hot air welded to a dustproof plate (also known as a "dustproof plate") set on the lower slide rail of the car seat as a carrier. One drawback of this processing method is that, because the externally heated "hot air gun" mode generates high-temperature gas through heating elements to heat the material surface from the outside, melting it and then bonding it under pressure, energy is dispersed and energy loss is large. Secondly, the processing speed is relatively slow, requiring several seconds or even tens of seconds for preheating and fusion, thus affecting production efficiency. Thirdly, because hot air welding relies to some extent on the operator's skill, it is prone to problems such as incomplete welds and over-welds, resulting in large fluctuations in strength. Fourthly, because hot air welding is performed using a hot air gun, it is prone to leaving marks, uneven surfaces, and even a high probability of scorching. Fifthly, it is not suitable for continuous, scaled-up production requirements.

[0007] Therefore, it is of positive significance to explore a method for preparing a dustproof zipper for automotive seat slide rails that can fully compensate for the above-mentioned deficiencies. Summary of the Invention

[0008] The objective of this invention is to provide a method for preparing a dustproof zipper for automotive seat slide rails that helps ensure good waterproof and dustproof performance, including the zipper teeth; facilitates the instantaneous generation of heat within the material through a microwave oven effect, thereby reducing energy loss; facilitates instantaneous fusion, thereby improving preparation efficiency; helps avoid the influence of human factors, thereby ensuring consistent strength; and prevents surface marks, unevenness, or even scorching.

[0009] The objective of this invention is achieved by providing a method for preparing a dustproof zipper for an automotive seat slide rail, comprising the following steps: A) To prepare a dustproof sheet, TPU solid granules are fed into the barrel of a screw extruder through a feeding cylinder. The screw inside the barrel melts and plasticizes the granules into a viscous flow state and extrudes them into a mold with the same cross-sectional shape as the dustproof sheet. The extruded material is then cooled and drawn out of the mold to obtain the dustproof sheet. B) To prepare the zipper strip, first, unwind a strip-shaped and coiled base strip made of nylon or polyester, and pass one side of the base strip along its length through a tooth injection mold. Molten TPU melt is introduced into the tooth injection mold, and the base strip exits the tooth injection mold. A tooth made of TPU, integral with the base strip, is attached to one side of the base strip along its length, resulting in a base strip with attached teeth. Then, while the base strip with attached teeth moves in the direction of winding by the take-up roller, a TPU layer is applied to the surface of the base strip with attached teeth facing upwards through an extrusion coating process, and this TPU layer covers the side of the base strip facing upwards. When the base strip with attached teeth passes between two power-driven rollers, the rollers press the material constituting the TPU layer and allow it to penetrate into the base strip, resulting in a coiled zipper strip collected by the take-up roller. C) To prepare the finished dustproof zipper, the dustproof plates obtained in step A) are paired and parallel to each other while maintaining a distance between them, and are moved to the station of the high-frequency welding machine by a traction device or conveyor. At the same time, a pair of coiled zipper strips obtained in step B) are also moved to the station of the high-frequency welding machine by a traction device at the same speed as the dustproof plates. The edges of the pair of zipper strips opposite to the zipper teeth and the surfaces with the TPU layer are in contact with the lower part between the opposite sides of the pair of dustproof plates. When entering the high-frequency welding machine, the high-frequency welding machine welds the lower surfaces of the opposite sides of the pair of dustproof plates along the length direction to the edges of the pair of zipper strips with the TPU layer surface along the length direction, and then cuts them according to the length of the car seat slide rail and attaches the zipper head to obtain the dustproof zipper for the car seat slide rail.

[0010] In a specific embodiment of the present invention, the TPU solid granules mentioned in step A) are dried TPU solid granules that have been dried at a drying temperature of 110-130°C, a drying time of 120-240 min, and dried to a moisture content of <0.07%.

[0011] In another specific embodiment of the present invention, the screw extruder mentioned in step A) is a single-screw extruder, and the screw temperature is: zone 1 170-180℃, zone 2 190-210℃, zone 3 190-210℃, zone 4 180-200℃ and the die temperature is 225-230℃; the screw speed of the screw extruder is 13-33 rpm.

[0012] In another specific embodiment of the present invention, the cooling in step A) is water cooling and the water temperature is 10-20°C, and the traction speed is 2-3.3 m / min.

[0013] In another specific embodiment of the present invention, the dustproof strip in step A) has a Shore hardness of 65-75D, the width of the dustproof plate is 1 to 2 times the width of one side of the car seat sliding rail, and a sliding rail positioning flange strip for positioning with the car seat sliding rail is formed on the downward side of the dustproof plate.

[0014] In another specific embodiment of the present invention, the thickness of the base tape made of nylon or polyester in step B) is 0.5-3mm and the width is 1.8-2.5cm; the thickness of the TPU layer is 0.05-0.5mm.

[0015] In a more specific embodiment of the present invention, the injection mold cavity of the chain tooth injection mold described in step B) is configured with a chain tooth cavity adapted to the shape and size of the chain tooth.

[0016] In a further specific embodiment of the present invention, the rollers mentioned in step B) are heated rollers, the heating temperature of which is 80-150°C and the pressure of which is 0.22-0.28 MPa.

[0017] In yet another specific embodiment of the present invention, the winding speed of the take-up roller in step B) is consistent with the unwinding speed of the baseband and is 5-20 m / min.

[0018] In yet another specific embodiment of the present invention, the zipper belt and dustproof plate mentioned in step C) travel at a speed of 2-8 m / min toward the workstation where the high-frequency welding machine is located; the welding time of the high-frequency welding machine is 1.5-3 s, and the working frequency of the high-frequency welding machine is 25-30 MHz.

[0019] The technical advantages of the present invention are as follows: Because the dustproof plate is made of TPU material, and because a TPU layer is formed on the upper surface of the base strip (made of nylon or polyester with zipper teeth) through an extrusion coating process to fully cover the surface of the base strip and zipper teeth, and because the zipper strip is welded to the opposite side of a pair of fixed plates along the length direction using a high-frequency welding process, and then cut and fitted with a zipper head, the resulting dustproof zipper for the car seat rail helps ensure the waterproof and dustproof effect, including the zipper teeth area; it facilitates the instantaneous generation of heat within the material during processing using a microwave oven effect, thereby reducing energy loss; it facilitates the instantaneous fusion of the zipper strip and the dustproof plate, thereby improving manufacturing efficiency; it helps avoid human intervention during processing, thus ensuring consistent quality; and it avoids surface marks, unevenness, or even scorching. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the dustproof zipper of the car seat slide rail obtained by the method of the present invention; Figure 2 for Figure 1 The diagram shows an application example of the structure.

[0021] In the diagram: 1. Dustproof plate, 11. Positioning flange strip; 2. Dustproof zipper, 21. Base belt, 211. TPU layer, 22. Chain tooth; 3. Zipper head; 4. Car seat slide rail; 5. Clamp. Detailed Implementation

[0022] In order to better understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the present invention. Any formal but not substantive equivalent transformations made based on the concept of the present invention should be considered within the scope of the present invention.

[0023] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the position of the diagram being described, and therefore should not be construed as a special limitation on the technical solution provided by this invention.

[0024] Example 1: Preparation of... Figure 1 The shown and satisfied are not limited to being provided by Figure 2 The method for preparing the dustproof zipper 2 of the automotive seat slide rail shown in the application case includes the following steps: A) Preparation of dustproof plate 1, which may also be called dustproof sheet, dustproof strip, or other similar component names. TPU solid granules are fed into the barrel of the screw extruder through the feed hopper (i.e., feed bucket). The screw inside the barrel melts and plasticizes the granules into a viscous flow state and extrudes them into a die with the same cross-sectional shape as the dustproof plate 1. After exiting the die, the granules undergo cooling and traction to obtain dustproof plate 1. The TPU solid granules mentioned in this step are dried TPU solid granules dried at a drying temperature of 110℃, a drying time of 240 minutes, and dried to a moisture content of 0.06%. The screw extruder is a single-screw extruder. The screw temperatures are: 170℃ in zone 1, 210℃ in zone 2, 200℃ in zone 3, 180℃ in zone 4, and 230℃ in the die head. The screw speed of the screw extruder, which is connected to the screw drive mechanism and driven by the screw, is 20 rpm. The cooling is water cooling at a temperature of 10-20℃. The traction speed, i.e., the exit speed of the dustproof plate, is 2 m / min. The Shore hardness of the dustproof strip 1 is 65D. The width of the dustproof strip 1 is twice the width of one side of the length direction of the car seat sliding rail as shown in the figure. A positioning flange strip 11 for positioning with the car seat sliding rail 4 is formed on the downward-facing side of the dustproof plate 1.

[0025] B) To prepare the zipper strip, first, unwind a strip-shaped nylon base strip 21 (purchased from the market) in coil form, with a thickness of 3mm and a width of 2.5cm. Then, move one side of the base strip 21 along its length through a zipper tooth injection mold. Molten TPU melt is introduced (i.e., "injected") into the zipper tooth injection mold. The base strip 21 exits the zipper tooth injection mold, and a TPU tooth 22, integrally formed with and inseparable from the base strip 21, is attached to one side of the base strip 21 along its length, resulting in a base strip 21 with the attached tooth 22. Then, while the base strip 21 with the attached tooth 22 moves in the direction of winding by the take-up roller, an extrusion coating process is used to coat the upward-facing surface of the base strip 21 with the attached tooth 22 with a layer of TPU. 211, and the TPU layer 211 covers the side of the chain tooth 22 facing upward. When the base strip 21 with the chain tooth 22 is passed between the power-driven rollers, the material constituting the TPU layer 211 is compressed by the rollers and penetrates into the base strip 21, resulting in a coiled zipper strip that is taken up by the aforementioned take-up roller. The thickness of the TPU layer 211 in this step is 0.2 mm. The mold of the chain tooth injection mold has a chain tooth cavity that is adapted to or consistent with the shape and size of the chain tooth 22. The rollers are heated rollers with a heating temperature of 120°C and a pressure of 0.28 MPa. The take-up roller has a take-up speed that is consistent with the unwinding speed of the base strip 21 and is 5 s. C) To prepare the dustproof zipper, the dustproof plates 1 obtained in step A) are paired up, parallel to each other and spaced apart, and are moved towards the high-frequency welding machine station by a traction device or a conveying device such as a curtain conveyor or roller conveyor. At the same time, a pair of coiled zipper tapes obtained in step B) are also moved side by side by a traction device towards the high-frequency welding machine station at the same speed as the dustproof plates 1. The edges of the pair of zipper tapes opposite to the zipper teeth 22 have the TPU layer. The surface of the base strip 211 is in overlapping contact with the lower part of the opposite side of the pair of dustproof plates 1, with the degree of contact being one-third or one-quarter of the width of the base strip 21. When entering the high-frequency welding machine, the high-frequency welding machine welds the lower surface of the opposite side of the dustproof plate 1 along its length to the edge of the pair of zipper strips (also called "base strip 21") with the TPU layer 211, i.e., the overlapping contact part, into one piece. After exiting the high-frequency welding machine, it is cut according to the length of the car seat slide rail 4 and the zipper head 3 is installed to obtain the product made of... Figure 1 and Figure 2 The dustproof zipper is shown for the car seat slide rail.

[0026] Example 2: Preparation of... Figure 1 The shown and satisfied are not limited to being provided by Figure 2 The method for preparing the dustproof zipper 2 of the automotive seat slide rail shown in the application case includes the following steps: A) Preparation of dustproof plate 1, which may also be called dustproof sheet, dustproof strip, or other similar component names. TPU solid granules are fed into the barrel of the screw extruder through the feed hopper (i.e., feed bucket). The screw inside the barrel melts and plasticizes the granules into a viscous flow state and extrudes them into a die with the same cross-sectional shape as the dustproof plate 1. After exiting the die, the granules undergo cooling and traction to obtain dustproof plate 1. The TPU solid granules mentioned in this step are dried TPU solid granules dried at a drying temperature of 130℃ for 120 minutes until the moisture content is 0.02%. The screw extruder is a single-screw extruder. The screw temperatures are: Zone 1 175℃, Zone 2 195℃, Zone 3 210℃, Zone 4 185℃, and the die head temperature is 225℃. The screw speed of the screw extruder, which is connected to and driven by the screw drive mechanism, is 13 rpm. The cooling is water cooling at a temperature of 10-20℃. The traction speed, i.e., the exit speed of the dustproof plate, is 1.3 m / min. The Shore hardness of the dustproof strip 1 is 75D. The width of the dustproof strip 1 is 1.5 times the width of one side of the length direction of the car seat sliding rail as shown in the figure. A positioning flange strip 11 for positioning with the car seat sliding rail 4 is formed on the downward-facing side of the dustproof plate 1.

[0027] B) To prepare the zipper strip, first, unwind a strip-shaped base strip 21 (purchased from the market) made of polyester, with a thickness of 0.5 mm and a width of 1.8 cm, and move one side of the base strip 21 along its length through a zipper tooth injection mold. Molten TPU melt is introduced (i.e., "injected") into the zipper tooth injection mold. The base strip 21 exits the zipper tooth injection mold, and a zipper tooth 22, made of TPU and integrally formed with the base strip 21, is attached to one side of the base strip 21 along its length, resulting in a base strip 21 with the zipper tooth 22 attached. Then, while the base strip 21 with the zipper tooth 22 is moving in the winding direction of the take-up roller, a TPU layer is coated onto the upward-facing surface of the base strip 21 with the zipper tooth 22 attached through an extrusion coating process. 211, and the TPU layer 211 covers the side of the chain tooth 22 facing upward. When the base strip 21 with the chain tooth 22 is passed between the power-driven rollers, the material constituting the TPU layer 211 is compressed by the rollers and penetrates into the base strip 21, resulting in a coiled zipper strip that is collected by the aforementioned take-up roller. The thickness of the TPU layer 211 in this step is 0.06 mm. The mold of the chain tooth injection mold has a chain tooth cavity that is adapted to or consistent with the shape and size of the chain tooth 22. The rollers are heated rollers with a heating temperature of 150°C and a pressure of 0.22 MPa. The take-up roller has a take-up speed that is consistent with the unwinding speed of the base strip 21 and is 8 s. C) To prepare the dustproof zipper, the dustproof plates 1 obtained in step A) are paired up, parallel to each other and spaced apart, and are moved towards the high-frequency welding machine station by a traction device or a conveying device such as a curtain conveyor or roller conveyor. At the same time, a pair of coiled zipper tapes obtained in step B) are also moved side by side by a traction device towards the high-frequency welding machine station at the same speed as the dustproof plates 1. The edges of the pair of zipper tapes opposite to the zipper teeth 22 have the TPU layer. The surface of the base strip 211 is in overlapping contact with the lower part of the opposite side of the pair of dustproof plates 1, with the degree of contact being one-third or one-quarter of the width of the base strip 21. When entering the high-frequency welding machine, the high-frequency welding machine welds the lower surface of the opposite side of the dustproof plate 1 along its length to the edge of the pair of zipper strips (also called "base strip 21") with the TPU layer 211, i.e., the overlapping contact part, into one piece. After exiting the high-frequency welding machine, it is cut according to the length of the car seat slide rail 4 and the zipper head 3 is installed to obtain the product made of... Figure 1 and Figure 2 The dustproof zipper is shown for the car seat slide rail.

[0028] Example 3: Preparation of... Figure 1 The shown and satisfied are not limited to being provided by Figure 2The method for preparing the dustproof zipper 2 of the automotive seat slide rail shown in the application case includes the following steps: A) Preparation of dustproof plate 1, which may also be called dustproof sheet, dustproof strip, or other similar component names. TPU solid granules are fed into the barrel of the screw extruder through the feed hopper (i.e., feed bucket). The screw inside the barrel melts and plasticizes the granules into a viscous flow state and extrudes them into a die with the same cross-sectional shape as the dustproof plate 1. After exiting the die, the granules undergo cooling and traction to obtain dustproof plate 1. The TPU solid granules mentioned in this step are dried TPU solid granules dried at a drying temperature of 120℃, a drying time of 180 minutes, and dried to a moisture content of 0.05%. The screw extruder is a single-screw extruder. The screw temperatures are: 180℃ in zone 1, 205℃ in zone 2, 205℃ in zone 3, 195℃ in zone 4, and 228℃ in the die head. The screw speed of the screw extruder, which is connected to and driven by the screw drive mechanism, is 26 rpm. The cooling is water cooling at a temperature of 10-20℃. The traction speed, i.e., the exit speed of the dustproof plate, is 2.6 m / min. The Shore hardness of the dustproof strip 1 is 70D. The width of the dustproof strip 1 is twice the width of one side of the length direction of the car seat sliding rail as shown in the figure. A positioning flange strip 11 for positioning with the car seat sliding rail 4 is formed on the downward-facing side of the dustproof plate 1.

[0029] B) To prepare the zipper strip, first, unwind a strip-shaped base strip 21 (purchased from the market) made of polyester, 1.5 mm thick and 2 cm wide, and in coil form. Then, pass one side of the base strip 21 along its length through a zipper injection mold. Molten TPU is introduced (i.e., "injected") into the zipper injection mold. The base strip 21 exits the mold, and a TPU tooth 22, integrally formed with the base strip 21 and inseparable from it, is attached to one side of the base strip 21 along its length, resulting in a base strip 21 with the attached tooth 22. Then, while the base strip 21 with the attached tooth 22 moves in the direction of winding by the take-up roller, an extrusion coating process is used to coat the upward-facing surface of the base strip 21 with the attached tooth 22. 211, and the TPU layer 211 covers the side of the chain tooth 22 facing upward. When the base strip 21 with the chain tooth 22 is passed between the power-driven rollers, the material constituting the TPU layer 211 is compressed by the rollers and penetrates into the base strip 21, resulting in a coiled zipper strip that is taken up by the aforementioned take-up roller. The thickness of the TPU layer 211 in this step is 0.4 mm. The mold of the chain tooth injection mold has a chain tooth cavity that is adapted to or consistent with the shape and size of the chain tooth 22. The rollers are heated rollers with a heating temperature of 80°C and a pressure of 0.38 MPa. The take-up roller has a take-up speed that is consistent with the unwinding speed of the base strip 21 and is 20 s. C) To prepare the dustproof zipper, the dustproof plates 1 obtained in step A) are paired up, parallel to each other and spaced apart, and are moved towards the high-frequency welding machine station by a traction device or a conveying device such as a curtain conveyor or roller conveyor. At the same time, a pair of coiled zipper tapes obtained in step B) are also moved side by side by a traction device towards the high-frequency welding machine station at the same speed as the dustproof plates 1. The edges of the pair of zipper tapes opposite to the zipper teeth 22 have the TPU layer. The surface of the base strip 211 is in overlapping contact with the lower part of the opposite side of the pair of dustproof plates 1, with the degree of contact being one-third or one-quarter of the width of the base strip 21. When entering the high-frequency welding machine, the high-frequency welding machine welds the lower surface of the opposite side of the dustproof plate 1 along its length to the edge of the pair of zipper strips (also called "base strip 21") with the TPU layer 211, i.e., the overlapping contact part, into one piece. After exiting the high-frequency welding machine, it is cut according to the length of the car seat slide rail 4 and the zipper head 3 is installed to obtain the product made of... Figure 1 and Figure 2 The dustproof zipper is shown for the car seat slide rail.

[0030] Example 4: Preparation of... Figure 1 The shown and satisfied are not limited to being provided by Figure 2 The method for preparing the dustproof zipper 2 of the automotive seat slide rail shown in the application case includes the following steps: A) Preparation of dustproof plate 1, which may also be called dustproof sheet, dustproof strip, or other similar component names. TPU solid granules are fed into the barrel of the screw extruder through the feed hopper (i.e., feed bucket). The screw inside the barrel melts and plasticizes the granules into a viscous flow state and extrudes them into a die with the same cross-sectional shape as the dustproof plate 1. After exiting the die, the granules undergo cooling and traction to obtain dustproof plate 1. The TPU solid granules mentioned in this step are dried TPU solid granules dried at a drying temperature of 130℃, a drying time of 140 minutes, and dried to a moisture content of 0.04%. The screw extruder is a single-screw extruder. The screw temperatures are: 176℃ in zone 1, 190℃ in zone 2, 190℃ in zone 3, 200℃ in zone 4, and 226℃ in the die head. The screw speed of the screw extruder, which is connected to and driven by the screw drive mechanism, is 33 rpm. The cooling is water cooling at a temperature of 10-20℃. The traction speed, i.e., the exit speed of the dustproof plate, is 3.3 m / min. The Shore hardness of the dustproof strip 1 is 68D. The width of the dustproof strip 1 is 1 times the width of one side of the length direction of the car seat sliding rail as shown in the figure. A positioning flange strip 11 for positioning with the car seat sliding rail 4 is formed on the downward-facing side of the dustproof plate 1.

[0031] B) To prepare the zipper strip, first, unwind a strip-shaped nylon base strip 21 (purchased from the market) in coil form, with a thickness of 2.5 mm and a width of 2.2 cm. Then, move one side of the base strip 21 along its length through a zipper tooth injection mold. Molten TPU melt is introduced (i.e., "injected") into the zipper tooth injection mold. The base strip 21 exits the zipper tooth injection mold, and a TPU tooth 22, integrally formed with and inseparable from the base strip 21, is attached to one side of the base strip 21 along its length, resulting in a base strip 21 with the attached zipper tooth 22. Then, while the base strip 21 with the attached zipper tooth 22 moves in the winding direction by the take-up roller, an extrusion coating process is used to coat the upward-facing surface of the base strip 21 with the attached zipper tooth 22 with a layer of TPU. 211, and the TPU layer 211 covers the side of the chain tooth 22 facing upward. When the base strip 21 with the chain tooth 22 is passed between the power-driven rollers, the material constituting the TPU layer 211 is compressed by the rollers and penetrates into the base strip 21, resulting in a coiled zipper strip that is collected by the aforementioned take-up roller. The thickness of the TPU layer 211 in this step is 0.5 mm. The mold of the chain tooth injection mold has a chain tooth cavity that is adapted to or consistent with the shape and size of the chain tooth 22. The rollers are heated rollers with a heating temperature of 100°C and a pressure of 0.32 MPa. The take-up roller has a take-up speed that is consistent with the unwinding speed of the base strip 21 and is 15 s. C) To prepare the dustproof zipper, the dustproof plates 1 obtained in step A) are paired up, parallel to each other and spaced apart, and are moved towards the high-frequency welding machine station by a traction device or a conveying device such as a curtain conveyor or roller conveyor. At the same time, a pair of coiled zipper tapes obtained in step B) are also moved side by side by a traction device towards the high-frequency welding machine station at the same speed as the dustproof plates 1. The edges of the pair of zipper tapes opposite to the zipper teeth 22 have the TPU layer. The surface of the base strip 211 is in overlapping contact with the lower part of the opposite side of the pair of dustproof plates 1, with the degree of contact being one-third or one-quarter of the width of the base strip 21. When entering the high-frequency welding machine, the high-frequency welding machine welds the lower surface of the opposite side of the dustproof plate 1 along its length to the edge of the pair of zipper strips (also called "base strip 21") with the TPU layer 211, i.e., the overlapping contact part, into one piece. After exiting the high-frequency welding machine, it is cut according to the length of the car seat slide rail 4 and the zipper head 3 is installed to obtain the product made of... Figure 1 and Figure 2 The dustproof zipper is shown for the car seat slide rail.

[0032] Depend on Figure 2As shown, the positioning flange strip 11 of the dustproof plate 1 obtained in Examples 1 to 4 is located on the outside of the lower rail 4 of the car seat and is limited by clamps 5 that are added separately at intervals. The upper end of the zipper head 3 is... Figure 2 The zipper head 3 is not shown in the diagram, but it is fully understandable based on common sense. It is driven by the car seat upper slide rail. That is to say, the upper end of the zipper head 3 is connected to the car seat upper slide rail, and the lower end or base of the zipper head 3 is engaged with the zipper tooth 22.

[0033] Since the working mechanism of the upper slide rail and the lower slide rail 4 of the car seat are existing technologies, for example, see CN222891913U (a waterproof and dustproof zipper for a long slide rail of a vehicle seat), the applicant will not elaborate further. However, it should be noted that the structural form of the lower slide rail 4 of the car seat is not subject to change. Figure 2 The limitations shown.

[0034] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

Claims

1. A method for preparing a dustproof zipper for an automotive seat slide rail, characterized in that: Includes the following steps: A) To prepare a dustproof sheet, TPU solid granules are fed into the barrel of a screw extruder through a feeding cylinder. The screw inside the barrel melts and plasticizes the granules into a viscous flow state and extrudes them into a mold with the same cross-sectional shape as the dustproof sheet. The extruded material is then cooled and drawn out of the mold to obtain the dustproof sheet. B) To prepare the zipper strip, first, unwind a strip-shaped and coiled base strip made of nylon or polyester, and pass one side of the base strip along its length through a tooth injection mold. Molten TPU melt is introduced into the tooth injection mold, and the base strip exits the tooth injection mold. A tooth made of TPU, integral with the base strip, is attached to one side of the base strip along its length, resulting in a base strip with attached teeth. Then, while the base strip with attached teeth moves in the direction of winding by the take-up roller, a TPU layer is applied to the surface of the base strip with attached teeth facing upwards through an extrusion coating process, and this TPU layer covers the side of the base strip facing upwards. When the base strip with attached teeth passes between two power-driven rollers, the rollers press the material constituting the TPU layer and allow it to penetrate into the base strip, resulting in a coiled zipper strip collected by the take-up roller. C) To prepare the finished dustproof zipper, the dustproof plates obtained in step A) are paired and parallel to each other while maintaining a distance between them, and are moved to the station of the high-frequency welding machine by a traction device or conveyor. At the same time, a pair of coiled zipper strips obtained in step B) are also moved to the station of the high-frequency welding machine by a traction device at the same speed as the dustproof plates. The edges of the pair of zipper strips opposite to the zipper teeth and the surfaces with the TPU layer are in contact with the lower part between the opposite sides of the pair of dustproof plates. When entering the high-frequency welding machine, the high-frequency welding machine welds the lower surfaces of the opposite sides of the pair of dustproof plates along the length direction to the edges of the pair of zipper strips with the TPU layer surface along the length direction, and then cuts them according to the length of the car seat slide rail and attaches the zipper head to obtain the dustproof zipper for the car seat slide rail.

2. The method for preparing the dustproof zipper for the automobile seat slide rail according to claim 1, characterized in that: The TPU solid granules mentioned in step A) are dried TPU solid granules that have been dried at a drying temperature of 110-130℃, a drying time of 120-240 min, and dried to a moisture content of <0.07%.

3. The method for preparing the dustproof zipper for the automobile seat slide rail according to claim 1, characterized in that: The screw extruder mentioned in step A) is a single-screw extruder with the following screw temperatures: Zone 1 170-180℃, Zone 2 190-210℃, Zone 3 190-210℃, Zone 4 180-200℃, and Die temperature 225-230℃; the screw speed of the screw extruder is 13-33 rpm.

4. The method for preparing the dustproof zipper for the automobile seat slide rail according to claim 1, characterized in that: The cooling described in step A) is water cooling with a water temperature of 10-20°C, and the traction speed is 2-3.3 m / min.

5. The method for preparing the dustproof zipper for the automobile seat slide rail according to claim 1, characterized in that: The dustproof strip mentioned in step A) has a Shore hardness of 65-75D, the width of the dustproof plate is 1 to 2 times the width of one side of the car seat sliding rail, and a sliding rail positioning flange strip is formed on the downward side of the dustproof plate for positioning with the car seat sliding rail.

6. The method for preparing the dustproof zipper for the automobile seat slide rail according to claim 1, characterized in that: The base tape, made of nylon or polyester, described in step B), has a thickness of 0.5-3 mm and a width of 1.8-2.5 cm; the TPU layer has a thickness of 0.05-0.5 mm.

7. The method for preparing the dustproof zipper for the automobile seat slide rail according to claim 1, characterized in that: In step B), the injection mold cavity of the chain tooth is formed with a chain tooth cavity adapted to the shape and size of the chain tooth.

8. The method for preparing the dustproof zipper for the automobile seat slide rail according to claim 1, characterized in that: The rollers mentioned in step B) are heated rollers, with a heating temperature of 80-150℃ and a pressure of 0.22-0.28MPa.

9. The method for preparing the dustproof zipper for the automobile seat slide rail according to claim 1, characterized in that: The winding speed of the take-up roller in step B) is consistent with the unwinding speed of the baseband and is 5-20 m / min.

10. The method for preparing the dustproof zipper for the automobile seat slide rail according to claim 1, characterized in that: In step C), the zipper belt and dustproof plate move towards the station of the high-frequency welding machine at a speed of 2-8 m / min; the welding time of the high-frequency welding machine is 1.5-3 s, and the working frequency of the high-frequency welding machine is 25-30 MHz.

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