**I. Introduction** The concept of vortex has been around for a long time, with the first patents on 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 was largely forgotten. In 1973, the scroll mechanism was reintroduced, leading to the creation of the first model, making practical applications of this technology feasible. The high reliability, smooth operation, low noise, and energy-saving potential of the scroll mechanism quickly attracted attention from the refrigerator industry. It gained favor among industry leaders and was soon applied in industrial settings. Companies like Trane, Hitachi, and Copeland developed scroll compressor technologies that led the way in applying vortex technology globally. This advancement spurred progress and product upgrades in various industries, including refrigeration and air conditioning. Today, vortex technology has expanded beyond the compressor industry into vacuum pump manufacturing. It has enabled the development of oil-free vortex vacuum pumps that operate smoothly, are quiet, and save energy. These pumps provide a clean vacuum environment without polluting equipment or the surroundings, outperforming conventional oil pumps in terms of pumping speed, lifespan, and energy efficiency. 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 vacuum access method. Currently, major manufacturers of vortex vacuum pumps are based in the United States, Japan, and Europe, with companies like Anest Iwata (Japan), Varian (USA), and Busch (Germany) leading the market. Their products range from 0.25 L/s to 10 L/s, with some models reaching up to 15 L/s or more currently in pilot stages. **II. Characteristics and Application Areas of Oil-Free Scroll Vacuum Pumps** Creating a clean vacuum environment has always been a key goal for scientists and businesses. From the beginning, people have used various methods to achieve a clean vacuum. Today, clean vacuum access equipment includes condensate pumps, claw pumps, scroll pumps, and diaphragm pumps. Among these, oil-free scroll vacuum pumps offer several advantages: 1. **No oil, no friction**: No oil in the vacuum chamber, non-contact design, no wear, and no particulate pollution. 2. **High pumping capacity**: Double-scroll design increases pumping efficiency by about twice compared to single-stage pumps of the same diameter. 3. **High pumping efficiency**: With 3-4 pumping units, low pressure and minimal leakage between atmosphere and vacuum. 4. **Non-contact design**: Good balance, low torque, low noise, and minimal vibration. 5. **Simple and compact structure**: Smaller radius of motion, stable operation. 6. **Easy maintenance**: Small size, low maintenance cost. 7. **Air-cooled**: No need for water cooling. Current applications of oil-free scroll vacuum pumps include: - Semiconductor industry: Film preparation and packaging equipment - Scientific instruments: Synchrotron radiation beam lines, electron microscopes, and analytical devices - Machinery and equipment: Material preparation and purification systems - Chemical industry - Medical equipment: Dental tools, dialysis machines, and pharmaceuticals - Packaging industry: Food, medicine, and biological product packaging **III. Working Principle, Technical Specifications, and Comparison with Ordinary Pumps** An oil-free scroll vacuum pump consists of five main components: the scroll, crankshaft, gasket, anti-rotation mechanism, and motor. The fixed and orbiting scrolls interact to create a vacuum. The orbiting scroll is driven by the crankshaft, rotating around the fixed scroll, creating a series of crescent-shaped cavities that perform suction, compression, and exhaust. Compared to traditional rotary vane pumps, oil-free scroll pumps offer significant advantages. For example, they have higher pumping speeds, better ultimate vacuum, lower noise levels, and require no oil cooling. Table 1 provides a detailed comparison of technical indicators between the two types of pumps. **IV. Advantages of Oil-Free Scroll Vacuum Pumps and Common Issues for Users** Oil-free scroll vacuum pumps offer superior performance, including better sealing, smaller sliding speed, smoother operation, and reduced noise and vibration. They also help eliminate issues like oil pollution, noise, and high energy consumption, which are common with traditional rotary vane pumps. These pumps reduce system costs by eliminating the need for cold traps, regular cleaning, and oil replacement. They also offer lower energy consumption, lighter weight, and improved reliability. These benefits make them an ideal replacement for traditional oil pumps. **V. Structure of Oil-Free Scroll Vacuum Pumps** The main components of an oil-free scroll vacuum pump include the scroll, crankshaft, gaskets, and bearings. The pump’s compression and exhaust mechanisms work without direct contact, ensuring smooth operation. Proper heat management and clearance adjustments are essential to maintain high pumping speed and ultimate vacuum. Structural improvements such as gas ballast valves and sealed bearings enhance performance and durability. Design challenges include optimizing the scroll geometry, surface treatment, and gasket materials to ensure long-term reliability. **VI. Usage of Oil-Free Scroll Vacuum Pumps** Proper installation, safety precautions, and maintenance are crucial when using oil-free scroll vacuum pumps. Users should avoid pumping toxic or corrosive gases, install the pump on a level surface, and ensure proper grounding. Regular inspections and maintenance, such as checking bearings and seals, are necessary to ensure long-term performance. When pumping steam or moisture, special care must be taken to prevent condensation inside the pump. Gas ballast valves are essential for managing vapor and maintaining optimal vacuum conditions. **VII. Troubleshooting and Fault Diagnosis** Common issues with oil-free scroll vacuum pumps include pump failure, inability to reach ultimate vacuum, abnormal noise, and vibration. A fault diagnosis table helps users identify and resolve problems efficiently. If issues persist, contacting a local dealer is recommended. **Conclusion** With growing demand for clean, oil-free vacuum environments in industries such as semiconductors, scientific research, and medical equipment, the development of oil-free scroll vacuum pumps is becoming increasingly important. Despite current challenges in production and market adoption, the technology holds great potential for future growth. As more companies invest in research and development, the market for oil-free scroll vacuum pumps is expected to expand, driving innovation and improving the overall technical level of the vacuum industry.

Folding Box Packaging PVC

PVC Polyvinyl chloride plastic is a polymer formed by free radical polymerization of vinyl chloride monomer. The English name is polyviny chloride, or PVC for short.
PVC is one of the largest plastic products in the world. It is cheap and widely used. PVC resin is white or light yellow powder. Different additives can be added according to different purposes, and PVC plastics can present different physical and mechanical properties. Adding an appropriate amount of plasticizer to the polyvinyl chloride resin can make a variety of hard, soft and transparent products. PVC can be divided into soft PVC and hard PVC. Soft PVC is generally used for floors, ceilings and leather surfaces, but because soft PVC contains softeners (this is also the difference between soft PVC and hard PVC), it is easy to become brittle and difficult to store, so its scope of use is limited. Rigid PVC does not contain softeners, so it has good flexibility, easy forming, not brittle, non-toxic and pollution-free, and has a long storage time, so it has great development and application value. The essence of PVC is a kind of vacuum blister film, which is used for the surface packaging of various panels, so it is also called decorative film and adhesive film, which is used in building materials, packaging, medicine and many other industries. Among them, the building materials industry accounts for the largest proportion at 60%, followed by the packaging industry, and there are several other small-scale applications. According to the molecular weight, PVC can be divided into two types: general-purpose type and high-polymerization type. Our commonly used PVC resins are all universal.

Product name	Printing fold box PVC RIGID SHEET
Thickness	0.08mm – 0.80mm(80micron – 800micron)
Width	75mm – 1300mm
Colors	Transparent ,Glass clear ,Clear with blue tint, White color
Transparency	Transparent,semi-transparency,opaque
Application	Vacuum Forming ,Printing , Folding Box
Surface	Glossy
Form	by roll or cut sheet form
Hardness	Rigid
Dyne	36 Dyne ,38 Dyne ,40 Dyne, 42 Dyne
Processing type	Calender
Features	No Crystal Point / No Waves / Super Clear
Quality Assurance	1)Super Clear 2)Less waves 3)Less fish eyes4)SGS/ROSH certification 5)Trade assurance by Alibaba

Rigid Pvc Film,Printing Fold Pvc Film,Folding Box Packaging Pvc,Pvc Uncoated Card Overlay Film

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