**I. Introduction** The concept of vortex has been known for a long time, with the first patents in vortex technology dating back to the early 20th century. However, due to technological limitations at the time, it was not possible to manufacture vortex mechanisms, and the idea gradually faded from attention. In 1973, the scroll mechanism was reintroduced, leading to the creation of the first model agency, which made the practical application of this technology feasible. The high reliability, smooth operation, low noise, and energy-saving potential of the scroll mechanism quickly captured the attention of the refrigerator industry, gaining strong support from industry leaders and rapidly entering industrial applications. Scroll compressor technology, developed by well-known companies such as Trane, Hitachi, and Copeland, led the global trend in applying vortex technology. This advancement significantly contributed to technological progress and product upgrades across industries like refrigerators and air conditioners. Over time, vortex technology expanded beyond compressors and entered the vacuum pump manufacturing industry. It now enables oil-free vortex vacuum pumps that operate smoothly, produce less noise, and are more energy-efficient. These pumps provide a clean vacuum environment without polluting the equipment or surroundings, offering superior pumping speed, longevity, and energy efficiency compared to conventional oil-based pumps. In the early 1990s, the world's first scroll vacuum pump was introduced to the market, marking the beginning of the global promotion of scroll technology as a new type of vacuum access solution. Today, major manufacturers of vortex vacuum pumps are located in the United States, Japan, and Europe, with companies like Anest-Wahl (Japan), Varian (U.S.), and Busch (Germany) leading the way. Products range from 0.25 L/s to 10 L/s, with some models reaching up to 15 L/s or higher currently in pilot stages. **II. Characteristics and Application Areas of Oil-Free Scroll Vacuum Pumps** Creating a clean vacuum environment has always been the ideal goal for scientists and businesses. From the earliest attempts to generate a vacuum, people have sought various methods to achieve a clean vacuum environment. Over time, clean vacuum access equipment has evolved into types such as condensate pumps, liquid ring pumps, claw pumps, scroll pumps, and diaphragm pumps. Among these oil-free vacuum pumps, oil-free scroll vacuum pumps stand out due to their unique advantages: 1. No oil, no friction – no oil in the vacuum chamber, non-contact operation, no wear, and no particulate pollution. 2. High pumping capacity – double-scroll design offers twice the pumping capacity of single-stage pumps of the same diameter, saving energy. 3. Efficient pumping – with 3-4 pumping stages, low pressure loss and minimal leakage due to O-ring sealing. 4. Non-contact operation, good balance, low torque, reduced noise, and minimal vibration. 5. Simple and compact structure, small moving radius, and stable operation. 6. Small size, easy maintenance, and low maintenance costs. 7. Air-cooled, eliminating the need for water cooling. Current applications of oil-free scroll vacuum pumps include: - Semiconductor industry: thin film deposition equipment, semiconductor packaging systems. - Scientific instruments: synchrotron radiation beam lines, electron microscopes, analytical testing equipment. - Machinery and equipment: material preparation systems, vacuum testing, material purification devices. - Chemical industry. - Medical equipment: dental tools, dialysis machines, biologics, and pharmaceutical preparation. - Packaging industry: food, medical, and biological product packaging equipment. **III. Working Principle, Technical Specifications, and Comparison with Ordinary Pumps** An oil-free scroll vacuum pump consists of five main components: 1. Fixed scroll and orbiting scroll. 2. Crankshaft. 3. Gasket. 4. Anti-rotation mechanism. 5. Motor. The non-oil scroll vacuum pump is constructed using one or more involute helical scrolls, with one end connected to a plane. A fixed scroll and an orbiting scroll interact through an anti-rotation mechanism, creating symmetrical crescent-shaped cavities. As the orbiting scroll rotates around the fixed scroll, gas is drawn in, compressed, and expelled through the suction and exhaust ports. Compared to traditional rotary vane vacuum pumps, oil-free scroll vacuum pumps offer significant improvements in performance and efficiency. For example: | **Technical Indicators** | **Rotary Vane Oil Vacuum Pump** | **Vortex Oil-Free Vacuum Pump** | |-------------------------------|--------------------------------|----------------------------------| | Pumping Speed (L/s) | 2.0, 4.0, 8.0 | 2.0, 4.4, 8.7 | | Ultimate Vacuum (Pa) | 0.6 | 1.0 | | Service Life (h) | 40,000 | 40,000 | | Overhaul Interval (h) | 8,000 | 8,000 | | Cooling Medium | Oil | Air | | Noise (dB) | 75 | 60 | | Weight (kg) | 70 | 41 | | Motor Phase | 3/1 | 1 | | Voltage (V) | 220/380 | 220 | | Power (kW) | 1.1 | 0.6 | | RPM | 1,400 | 1,437 | **IV. Advantages and Issues of Oil-Free Scroll Vacuum Pumps** 1. **Superior Performance** - Excellent sealing, no direct connection between suction and exhaust chambers, making it easier to achieve a higher vacuum level. - Smaller rotating radius, reducing sliding speed and extending the pump’s lifespan. - Slow compression process, multiple compression stages, and symmetrical compression chambers ensure smooth operation, low noise, and minimal vibration. 2. **Solving Pollution and Vibration Problems** - Unlike traditional rotary vane pumps, oil-free scroll pumps eliminate oil pollution, noise, and vibration issues. They are especially beneficial in sensitive industries like semiconductors and biomedical research. 3. **Reducing System Costs** - Eliminating the need for cold traps, oil replacement, and frequent cleaning reduces operational costs. Their lighter weight, lower energy consumption, and stable performance make them ideal replacements for traditional oil pumps. **V. Structure of Oil-Free Scroll Vacuum Pumps** The main components include the scroll, crankshaft, gaskets, and anti-rotation mechanism. The fixed and orbiting scrolls work together to create a continuous pumping cycle. Proper heat management and minimizing clearance between scrolls improve pumping speed and ultimate vacuum. To address issues like bearing wear and contamination, oil-free scroll pumps often feature ballast valves and sealed bearings. These improvements enhance durability and reliability. **VI. Usage and Maintenance of Oil-Free Scroll Vacuum Pumps** 1. **Safety Precautions** - Ensure the pump is used within safe limits, avoiding toxic, flammable, or corrosive gases. - Install in a dry, well-ventilated area away from flammable materials. - Maintain proper grounding and use qualified electricians for wiring. 2. **Installation Methods** - Check the orientation and condition of the pump before installation. - Ensure the installation surface is level and free from debris. - Connect the pump to the vacuum chamber with clean pipes and avoid blocking the exhaust port. 3. **Operation – Pumping Dry Gas** - Initial start-up may take longer to reach ultimate vacuum. Open the intake valve periodically during the first few hours. - Avoid high humidity environments to prevent water vapor buildup. 4. **Operation – Pumping Steam** - Use a gas ballast valve to prevent water vapor condensation inside the pump. - Follow specific procedures for starting and stopping the pump when handling steam. 5. **Inspection and Maintenance** - Regularly check bearings and seals for wear and replace them after 8,000 hours of operation. - Monitor for abnormal noises, vibrations, and leaks, and perform timely repairs. 6. **Troubleshooting** - Refer to a fault diagnosis table to identify and resolve common issues such as pump failure, inability to reach ultimate vacuum, and unusual noise or vibration. **VII. Conclusion** With increasing demand for clean, oil-free vacuum environments in sectors like semiconductors, scientific research, and medical equipment, the development of affordable and high-performance oil-free scroll vacuum pumps is essential. While imported models face challenges in price and awareness, domestic production is growing. With further advancements, oil-free scroll vacuum pumps are poised to become a key player in the Chinese market, driving innovation and technological improvement in the vacuum industry.

PC polycarbonate Film

PC film is the abbreviation of polycarbonate film, which is an amorphous, odorless, non-toxic, highly transparent colorless or yellowish thermoplastic engineering plastic.

advantage
It has excellent physical and mechanical properties, especially excellent impact resistance, high tensile strength, bending strength, and compression strength; good heat resistance and low temperature resistance, stable mechanical properties in a wide temperature range, and size Stability, electrical properties and flame retardancy, can be used for a long time at -60~120℃; no obvious melting point, in a molten state at 220-230℃; high rigidity, high resin melt viscosity; low water absorption, low shrinkage , Small creep, high dimensional accuracy, good dimensional stability, low permeability of the film; self-extinguishing material; stable to light, but not resistant to ultraviolet light, good weather resistance; oil and acid resistance.

Disadvantage
The fatigue strength is poor, stress cracking easily occurs, and the wear resistance is poor. Poor resistance to solvents, not resistant to strong alkalis, oxidizing acids, amines and ketones, soluble in chlorinated hydrocarbons and aromatic solvents, and prone to hydrolysis and cracking in water for a long time.

pc film classification
PC films are divided into: halogen-free flame-retardant PC, black flame-retardant PC, transparent flame-retardant PC, frosted PC, transparent PC, hardened PC, scratch-resistant PC, scratch-resistant PC, printing-grade PC, optical-grade PC

pc film use
1. Flame-retardant pc film is used for power system insulation, disk drive insulation, keyboard insulation, TV/display insulation, and computer motherboard insulation. It is widely used in electronic components, electrical enclosures, switch panels, junction boxes and charger enclosures, automotive instrumentation and panel printing with flame-retardant requirements.

2. Printing grade frosted pc film is suitable for special printing, helmets, signs, nameplates, protective covers, etc.

3. Anti-scratch pc film Uses: window lenses for mobile phones, MP3, MP4, DVD, backlight and other electronic products

Pc Film,Pc Sheet Film,White Pc Film,Printing Pc Film

Shandong Top Leader Plastic Packing CO., LTD , https://www.sdzlplastic.com