**Machine Model** **Length-to-Diameter Ratio** **Motor Power (kW)** **Specifications (mm)** **Production Rate (m/h)** **SJ-90** 25:1 15 25–80 1,600 **SJ-105** 25:1 22 80–120 2,100 **Applications** This production line is designed for manufacturing edge strips used in advertising lettering. Made from anti‑aging resin with metal inserts embedded in the center, it offers excellent formability, flexibility, and a wide range of vibrant colors. It enables rapid fabrication of illuminated signs with strong three-dimensional effects, while being easy to use, time‑saving, labor‑efficient, energy‑conserving, and environmentally friendly—making it ideal for the advertising industry. Our newly developed edge strip for advertising letters is an ideal solution for today’s illuminated and vacuum‑formed sign industries. No specialized equipment or tools are required; simply wrap it around the lettering by hand. This product ensures quick and effortless edge finishing without shrinking, warping, or thermal expansion/contraction. It can be bent freely, features vivid colors, and delivers fast production speeds. Compared to traditional methods, it increases productivity by over 10%, maintains colorfastness for up to 10 years, and produces aesthetically pleasing illuminated vacuum‑formed signs. **Production Process** The production process for advertising letter edge strips involves using a plastic extruder equipped with a die to coat the desired shape onto the mold, followed by a laminating machine that applies a glossy film to the finished product. The advertising letter edge strip production lines manufactured by Hebei Shuangda Rubber & Plastic Machinery Co., Ltd. have earned widespread acclaim among customers. With a high degree of automation, this process significantly reduces labor requirements and costs. Key components include the plastic extruder die, laminating machine, steel belt reel, and winding machine.

Model Length-to-Diameter Ratio Motor Power (kW) Specifications (mm) Output (kg/h) SJ-45 30:1 7.5 12–40 20 SJ-65 30:1 11 40–200 80 Applications and Features: The SJ series single-screw extruders primarily consist of a barrel and screw assembly, a drive system, heating and cooling mechanisms, and electrical control systems. They are mainly used for processing plastics such as PVC, PE, PP, ABS, and TPE. When equipped with auxiliary machinery, they can directly produce plastic products like profiles, sheets, pipes, and pellets through plasticization and extrusion molding. This equipment features an excellent design, high output, superior plasticization, low energy consumption, and hard-toothed gear transmission. It also boasts low noise, smooth operation, strong load-bearing capacity, and long service life. Plastic Extruders: In terms of functionality, high efficiency is reflected in high productivity, low energy consumption, and reduced manufacturing costs. Screw-type plastic extruders are no longer limited to the extrusion molding and compounding of polymeric materials; their applications have expanded into fields such as food, feed, electrodes, building materials, packaging, pulp, and ceramics. Features: Modular production of plastic extruders allows them to meet diverse user requirements, shorten new product development cycles, and capture larger market shares. Additionally, manufacturers can arrange production or even procure individual system modules and components separately, which helps ensure overall quality, reduce costs, and accelerate capital turnover. High Efficiency and Versatility The high efficiency of plastic extruders is evident in their ability to deliver high output, consume less energy, and lower manufacturing expenses. Functionally, screw-type plastic extruders are no longer confined to polymer extrusion and compounding; their applications now extend to industries including food, feed, electrodes, explosives, building materials, packaging, pulp, and ceramics.

Equipment Installation This equipment can be installed on a pre-cast concrete foundation or placed directly on a flat, level surface. The entire unit is equipped with vibration-damping feet. During installation, ensure proper layout and leave adequate operating space. Equipment Operating Instructions Before conducting a trial run, carefully inspect the following items: 1. Verify that the site’s power supply parameters match those specified in this manual and confirm that all electrical components are correctly connected. 2. Check all connections for looseness; if any are loose, tighten them promptly. 3. Confirm that the gearbox contains the correct type of lubricant and that the oil level is sufficient. Use medium‑pressure gear oil N151 or another gear oil of similar viscosity. The oil level should reach the upper mark on the gearbox oil dipstick. 4. Manually rotate the coupling connecting the main motor to the gearbox in a clockwise direction for at least two full revolutions, ensuring smooth and flexible operation. 5. Verify that the main motor rotates in the correct direction: when viewed from the head end, it should turn clockwise. After completing these checks, proceed with the host machine’s trial run according to the following steps: 1. Increase the host temperature to a level appropriate for the specific material being processed; users may set this value independently. Once the desired temperature is reached, maintain it for 0.5–1 hour. Monitor the temperature control system throughout the heating process to ensure proper functioning. 2. Inspect the cooling water system to confirm it is operating normally and check for leaks; address any issues immediately. 3. After completing the above steps, begin rotating the screw. Do not feed material initially; gradually increase the screw speed to approximately 41 rpm and run the machine idling for about 4–5 minutes. Observe whether the equipment operates smoothly. If any abnormalities occur, stop the machine, troubleshoot the issue, and then restart. 4. Gradually increase both the screw speed and the feed rate until the desired production output is achieved. Maintenance Instructions I. Main Motor 1. The deviation between the actual supply voltage and the rated value should not exceed 5%; similarly, the deviation in supply frequency should not exceed 1%. 2. Replace the motor’s grease every 4,000 hours of operation using No. 3 base grease. If the motor remains idle for an extended period, inspect the bearings for grease before reuse and replenish as necessary, filling the bearing housing to approximately two-thirds of its capacity. 3. During operation, if bearing temperatures become excessively high or the grease deteriorates, replace the grease promptly. Normal operating temperatures for bearings should not exceed 95°C. 4. Store the motor in a clean, cool, and dry environment when not in use. 5. Before reusing a long‑idle motor, measure its insulation resistance; it must be no less than 0.5 MΩ. If the reading falls below this threshold, perform drying treatment, ensuring the winding temperature does not exceed 121°C. II. Gearbox 1. Prior to use, fill the gearbox with lubricant—medium‑pressure gear oil or another gear oil of similar viscosity—until the oil level reaches the marked level on the dipstick. Note: Never operate the gearbox without adequate lubrication. 2. Maintain the gearbox within an ambient temperature range of 1–35°C. If the temperature exceeds this range, install a heating or cooling device as needed. 3. After 300–600 hours of operation, change the lubricant; thereafter, replace it every 4,000 hours. Perform this replacement while the gearbox is stopped and still warm; drain the old lubricant, flush the gearbox thoroughly with fresh lubricant of the same grade, and then refill with the prescribed amount of new lubricant. 4. If the gearbox has been idle for an extended period, run it empty for a short time before loading material to ensure adequate lubrication of the bearings. Regularly inspect all connections and monitor gear wear, addressing any issues promptly. 5. During operation, if abnormal noise, vibration, or overheating occurs, stop the machine immediately, investigate the cause, and resolve the problem before resuming use. III. Screw Removal Instructions 1. Before removing the screw, first dismantle the extruder head and ensure sufficient working space. Drain as much material as possible from the screw prior to disassembly. 2. Perform screw removal only when the host machine is maintained at its normal operating temperature. Take appropriate precautions to protect personnel from burns, and handle the screw carefully to avoid damage.

Model Sj-30 Sj-65 Sj-80 Sj-90 Sj-105 Screw Diameter (mm) 30 65 80 90 105 Length-to-Diameter Ratio 25:1 25:1 25/30:1 25/30:1 25/30:1 Motor Power (kW) 2.2 7.5 11–15 15–18.5 22 Machine Center Height (mm) 850 850 850 1000 1100 Screw Speed (r/min) 60 60 60 60 60 Output (kg/h) 5–8 40–80 80–150 150–250 220–330 Applications and Features: The SJ series single-screw extruders consist primarily of a barrel and screw assembly, a power transmission system, heating and cooling mechanisms, and electrical control systems. They are mainly used for processing plastics such as PVC, PE, PP, ABS, and TPE. When equipped with auxiliary equipment, they can directly produce plastic products like profiles, sheets, pipes, and pellets through plasticization and extrusion molding. This equipment features excellent design, high output, superior plasticization, low energy consumption, and hard-toothed gear transmission. It also boasts low noise, smooth operation, strong load-bearing capacity, and long service life. Plastic Extruders: In terms of functionality, high efficiency is reflected in increased production output, reduced energy consumption, and lower manufacturing costs. Plastic extruders are no longer limited to the extrusion molding and compounding of polymeric materials; their applications have expanded into fields such as food, feed, electrodes, building materials, packaging, pulp, ceramics, and more. Extrusion Principle: The extrusion process typically involves melting plastic at temperatures around 200°C, after which the molten material is forced through a die to form the desired shape. This method requires a deep understanding of plastic properties and extensive experience in mold design, making it a demanding forming technique. Extrusion molding entails continuously feeding heated and pressurized material through a die to achieve a specific shape. Also known as "extrusion," this method offers significant advantages over other forming techniques, including higher efficiency and lower unit costs. Extrusion is primarily used for thermoplastic materials but can also be applied to certain thermosetting plastics. The resulting products are continuous profiles, such as tubes, rods, filaments, sheets, films, and insulation layers for wires and cables. Additionally, extrusion can be employed for blending, plasticizing and pelletizing, coloring, and incorporating additives into plastics. Products formed via extrusion are often referred to as "profiles." Because their cross-sectional shapes are frequently irregular, these products are also called "special-shaped profiles."