3,000 Tons Per Year! Equipment Installation and Acceptance of Ultra-Thin Polypropylene (PP) Film Production Line for Capacitors!

On July 20, 2025, an exhilarating piece of news electrified the industry — the "3000-ton-per-year ultra-thin polypropylene film production line project for capacitors equipment installation engineering," meticulously constructed by Sichuan Rongzhi Shenghe Construction Engineering Co., Ltd., successfully passed its inspection in Huangjiagou, Hongzhan West Road, Pidu District, Chengdu (near the Intelligent Computing Center). This not only marks the successful conclusion of a two-year precision installation battle but also signifies a solid and crucial step forward for China in the high-end polypropylene film production field. The successful inspection of this project holds significant importance for the development of Dongcai Technology.

Dongcai Technology, fully named Sichuan Dongcai Technology Group Co., Ltd., is a technology-driven listed company that has been deeply involved in the field of new materials for many years, with the stock code 601208. The company was founded in 1966 and is located in Mianyang, China's Science and Technology City, with a registered capital of 897 million yuan. It has 25 subsidiaries and more than 3,000 employees. As a national high-tech enterprise and a national technology innovation demonstration enterprise, Dongcai Technology relies on innovation platforms such as the National Recognized Enterprise Technology Center, the National Insulation Material Engineering Technology Research Center, the National-Local Joint Engineering Research Center for the Development and Application of Insulation Materials for Power Generation and Transmission Equipment, and a postdoctoral research workstation. Based on new insulation materials, it focuses on the development of optical film materials, environmentally friendly flame retardant materials, advanced electronic materials, and other product series. Its products are widely used in power generation equipment, smart grids, new energy, rail transit, industrial electrical appliances, household appliances, flat panel displays, consumer electronics, 5G communications, environmentally friendly flame retardant fabrics, safety protection, and many other fields, making it a leader in technological innovation. After 58 years of development, the company's insulation materials segment has been ranked first in the nation for 33 consecutive years in the industry and is the leading production and research base for electrical and optical film new materials in China. Its electrical polyester film has been awarded the title of the fourth batch of single champion products in the manufacturing industry by the Ministry of Industry and Information Technology. In recent years, Dongcai Technology has closely aligned with the national strategic emerging industries direction, actively researching solutions to critical bottleneck problems, achieving domestic substitution for several innovative achievements, breaking foreign monopolies, and filling domestic gaps.

The projects accepted in this inspection include two imported production lines, P4/P5, from France's Marchan Company. Their completion will significantly enhance China's independent production capacity of high-end polypropylene film, providing strong support of key materials for fields such as new energy and electronic components, and will have a profound impact on the development of related industries. This achievement will also help Dongcai Technology further consolidate its position in the industry and make great strides toward becoming an industry benchmark.

Reviewing the key milestones of the project, every step embodies the dedication and wisdom of the builders.

Asynchronous Line P4 was the first to begin installation in July 2023. After a year of hard work, the installation was successfully completed in July 2024.

The synchronization line P5 will start installation in May 2024, and after 13 months of effort, the installation will be successfully completed in June 2025.

During the entire installation process, from asynchronous lines to synchronous lines, from equipment hoisting to millimeter-level precision calibration, the team from Sichuan Rongzhishenghe Construction Engineering Co., Ltd. overcame challenge after challenge with professional skills and a spirit of continuous innovation, ultimately delivering a perfect score on their final report.

The project has now successfully passed acceptance and is about to be officially put into operation. This not only serves as a high recognition of Sichuan Rongzhishenghe Construction Engineering Co., Ltd.'s professional capabilities but will also inject new and powerful momentum into Dongcai Technology, helping it to stand out in the industry and promote China's high-end materials industry to new heights.

High-end polypropylene film, as a high-performance film material based on polypropylene, holds an important position in various fields due to its outstanding physicochemical properties. Its preparation typically involves the selection of high-quality polypropylene resin and the use of advanced polymerization processes to ensure a regular molecular chain structure and uniform distribution, laying the foundation for the film's excellent performance. During processing, cutting-edge technologies such as biaxial stretching and multilayer co-extrusion are employed to precisely control the film's microstructure, further enhancing various performance indicators.

High-end polypropylene films boast extremely high transparency and gloss, allowing the shape and texture of the packaged contents to be clearly displayed. The light transmittance can reach over 90%, and the gloss rivals that of glass, making the product stand out on the shelf. Additionally, it possesses excellent mechanical strength, with tensile strength 30%-50% higher than that of ordinary polypropylene films. The longitudinal tensile strength can exceed 150MPa, while the transverse tensile strength surpasses 250MPa. It also features outstanding puncture resistance, with a significantly increased puncture force threshold, effectively protecting the internal items from external pressure and damage.

In terms of chemical resistance, high-end polypropylene films exhibit excellent tolerance to acids, alkalis, oils, and other substances. They are not prone to swelling or degradation, maintaining stability in various complex environments. For instance, they can maintain structural and performance integrity over time when in contact with oily foods in food packaging or with corrosive chemical reagents in industrial packaging, making them suitable for packaging needs in diverse and challenging environments. Moreover, their barrier properties can be precisely adjusted through special processes to meet moisture and oxidation resistance requirements while allowing for breathability as needed. For example, in fruit and vegetable preservation packaging, the permeability of oxygen and carbon dioxide can be reasonably controlled to extend the freshness period of the produce.

High-end polypropylene films are widely used in the fields of food packaging, pharmaceutical packaging, electronic device protection, and industrial material encapsulation. In food packaging, these films effectively extend the shelf life of food and ensure food safety due to their excellent barrier properties and hygiene safety. In pharmaceutical packaging, they meet the stringent requirements for moisture-proof, sterility, and stability, ensuring the quality of medicines. When used for electronic device protection, their outstanding electrostatic protection and insulation properties can prevent electronic components from being affected by static interference and short-circuit risks. In industrial material encapsulation, they protect large machinery parts, metal materials, and more from environmental corrosion during storage and transportation due to their high strength and weather resistance.

With continuous technological advancements, high-end polypropylene films have evolved into various special functional categories such as heat-shrinkable, antibacterial, and high-temperature resistant types. Heat-shrinkable films can closely adhere to packaged items when heated, achieving compact and aesthetically pleasing packaging, and are widely used in beverage bottle labels and electronic product packaging. Antibacterial films inhibit bacterial growth by incorporating antibacterial agents such as nanosilver, and are used in medical consumables and fresh food packaging. High-temperature resistant films can withstand temperatures above 150°C, making them suitable for high-temperature cooking food packaging and industrial high-temperature environment protection. These special functional categories further expand the application boundaries of high-end polypropylene films, making them one of the indispensable high-end materials in modern packaging and industrial fields.