Passenger safety is a key requirement of the public transportation sector, and the interiors of trains and subway cars, tram tracks, and bus interiors also need to be protected to prevent wear and tear due to frequent use and damage caused by vandalism. As a result, railway operators and other public transportation companies are increasingly insisting on using highly durable materials for vehicle interiors.In recent years, PC (polycarbonate) sheet production and processing technology has been continuously upgraded. These highly versatile products can ensure the safety and durability of public transportation vehicle interiors, and can also provide effective And significant noise protection.TramEnsure the safety and durability of the interiorPassenger trains are often deliberately vandalized. Vandals took pleasure in scraping windows, scribbling at will, and destroying seats. In addition, passenger trains will also be naturally damaged due to the effects of high and low temperatures. Any necessary repairs may affect the availability of the vehicle and cause additional costs. The use of PC sheets can not only prevent such damage, but also solve usability problems. Even at freezing temperatures, the material still has excellent fracture and chipping resistance and high impact resistance. At the same time, the material can effectively resist severe mechanical impact. Due to the excellent surface quality of the board, the scribble on the surface can be removed with a water pipe.The application advantage of PC board is very significant, and it has been successfully used in trains in some countries. For example, this board has been used in trains in the Netherlands and Germany.PC sheet vehicle interiorLong-lasting glazing effectPC sheets used in rail vehicles can be produced by hot pressing. This can not only save mold manufacturing costs, but also provide designers with a wide range of creative freedom. After all, in addition to safety, train interiors should also have a good appearance. PC board is an ideal material, not only easy to process and shape, but also lightweight and extremely strong.It is for this reason that PC sheets can also be used for glass assembly in the future to replace heavy, fragile glass. In this regard, the advantages of PC board have truly been widely recognized. This material is practically unbreakable and requires no repairs and accompanying services. The transparent polycarbonate also matches the optical quality of the glass.PC sheet vehicle interiorEffective noise protectionPC board and all its advantages can be more widely used for noise protection. After use, the noise level can be reduced by 36dB, which is far more than the 28dB noise reduction value specified by international standards. For railway transportation, PC sheet can also shine. High-speed trains will have a huge dynamic impact on the noise protection wall. For this reason, the German Railway Network AG (DBNetzAG) uses customized PC panels.Different from dark concrete tunnels or other opaque materials, the transparent noise protection wall made of PC board allows drivers and passengers to freely view the surrounding landscape at any time, and because light can pass through the noise protection wall, the noise protection wall The plants inside can also grow lush. Therefore, this type of noise protection wall can more effectively adapt to the surrounding environment. In addition, the PC board can be 100% reused after the expiration date.PC material vehicle seatIn general, as a vehicle interior component, PC board not only meets the needs of different colors and surface treatments, enhances the sense of design, but also makes the train lighter and safer, making it easier for passengers to get on and off the train. At the same time, it can also reduce energy consumption and pollution.
The third phase of Xixi National Wetland Park is connected with the first and second phases of Xixi National Wetland Park. It is located on the westernmost side of the wetland, close to the west line of Hangzhou Ring, with a total area of 3.35 square kilometers. The plan uses a discrete layout to set twelve plots as art collection villages. Each plot is equipped with an artist club of about 4000 square meters, and 12 architects are invited to carry out architectural design. The architectural nature is defined as a discrete creative club, which is intended to be provided to local artists as short-term accommodation and small private exhibitions. Professor Zhang Lei of the School of Architecture and Urban Planning of Nanjing University accepted the invitation of the organizer to undertake the design of the clubhouse.When the designer first came to the base, he was already infected by the beautiful environment of Xixi Wetland. He tried to find an ideal solution to match the environment of the base. His habitual sensitivity to the things around him quickly inspired him from the trees in the base. He hopes that the building can grow out of the base like a tree and coexist harmoniously with the surrounding environment.The final clubhouse was designed into five groups of units, each with an area of 800 square meters. Each group of units is composed of a large Y-shaped volume and two small Y-shaped volumes. The scale of the small Y-shaped volume is exactly half the length, width and height of the large Y-shaped volume. According to the landscape characteristics of the topography around the site, the size is Y The flexible arrangement of "1+2" combination forms a separated tree-like settlement structure that not only conforms to the ecological order but also has the function of natural variation, and interacts with the site landscape through organic growth, thereby forming a strong structure and visual relationship.Judging from the skin materials used in the building, the five clubhouse units can be divided into two basic types. Type 1: Large Y type uses white fair-faced concrete as skin material, small Y type uses milky white translucent Hollow pc sheet as skin material; Type 2: Large Y type and small Y type both use milky white translucent Hollow pc sheet as skin material.So why did Zhang Lei choose a special material like polycarbonate sheet in the club? The answer to this question is still to start with his original concept. In this project, "environmental sensitivity" is the starting point of his thinking, and the core of the design can be summarized as-how to build a building that is born in the environment and is better than the environment. The entire design process is developed around this core.In an interview, Zhang Lei once expressed this attitude towards this project: "...When I received this task, I felt that in such a dim place, the best thing is not to build a house...". Of course, responding to reality with nothingness is obviously not the fundamental way to solve the problem. Faced with the contradiction, Zhang Lei chose such a design strategy-although the volume of the building cannot be reduced (with area and usage requirements), it can weaken its sense of volume by controlling the texture of the material. Therefore, the "ambiguous" material of Hollow pc sheet has become a reasonable choice.It is conceivable that the clubhouse wrapped in milky white translucent Hollow pc sheet does not have obvious volume in the mist of the wetland. The light in the room at night penetrates through this gauze-like skin and diffuses on the quiet shore. From a distance, like a shadowy river lamp scattered on the water.Due to the constraints of objective conditions, the owner and the architect finally chose the flying wing Hollow pc sheet together. The curtain wall manufacturer provided an installation plan—using the primary and secondary keel system as the supporting structure of the Hollow pc sheet curtain wall; the individual panels were sealed with special fasteners. Out of responsibility for the quality of the project, the architect did not directly use the single-layer Hollow pc sheet curtain wall as the building maintenance structure, but designed corresponding composite exterior walls and composite roof systems for different locations according to design needs.All small Y-shaped volumes are covered by Hollow pc sheet except for the 3m*3m viewing window at the end of each branch, including the roof. The wall part is a "Hollow pc sheet (outside) + glass (inside)" type composite curtain wall system, and the roof is an additional layer of Hollow pc sheet on top of ordinary roofing practices.Except that the end of the large Y-shaped volume of Type 2 is designed as a 6m*6m viewing window, the rest of the walls are all "Hollow pc sheet (outside) + aerated concrete block walls (inside)" composite exterior walls system.It can be seen from the combination of Hollow pc sheet and other materials in the above practice that the purpose of this is to use conventional materials and structural measures to ensure the stability and durability of the maintenance structure. Although there is nothing special about the construction node of the Hollow pc sheet in this project, the application of the Hollow pc sheet in different locations fully reflects the architect's rigorous formal logic.First of all, the small Y-shaped exterior wall adopts the "Hollow pc sheet (outer) + glass (inner)" combination method, which takes advantage of the light-transmitting and non-see-through characteristics of the Hollow pc sheet, ensuring indoor privacy at night, and at the same time Allow the light to penetrate the translucent wall, so that the design concept can be fully realized.But if the small Y-shaped roof also chooses to use glass, wouldn't the lighting effect at night be more ideal? But the architect chose the conventional roofing method. Why? This is because the equipment and pipes in the small Y-shape are arranged below the roof and must be sheltered by a suspended ceiling. In this way, even if a glass roof is used, the purpose of light transmission cannot be achieved. So the architect chose the conventional method for the roof of Little Y.Since the conventional roof can meet the functional requirements, why is it necessary to cover it with a layer of Hollow pc sheet? This is because the small Y-shaped roof is only one floor high, and the second floor of the large Y-shaped roof can easily be seen. The overall view of the roof, in order to make the skin of the building have a continuous and coherent appearance, so it is still covered with a layer of exactly the same Hollow pc sheet.In order to express the integrity of the body, the large Y type also chose Hollow pc sheet as the skin material. But why not choose the same glass as the small Y shape inside the Hollow pc sheet, but choose the combination of "Hollow pc sheet (outside) + aerated concrete block wall (inside)"? This is because the architect hopes that the first floor in the large Y has sufficient clear height, so all the equipment and pipes in it are attached to the outer wall. Even if the glass curtain wall is used on the inside of the Hollow pc sheet, it will affect the light penetration due to the shielding of the equipment and pipes during the decoration.In the design of the “Art Collection Village” in the third phase of Xixi National Wetland Park, the architects maintained their sensitivity to the basic elements of the environment, space, and materials and their consistent clear logic, especially in the selection and application of materials. And temperance. The use of a large number of polycarbonate sheets has allowed Xixi National Wetland Park Phase III "Art Collection Village" to achieve good results without using exaggerated shapes and unconventional structures, which is low-key and powerful.
PC (polycarbonate) sheet is an amorphous, highly transparent thermoplastic engineering plastic with excellent physical and mechanical properties, especially excellent impact resistance, high tensile strength, bending strength, compressive strength, and low creep. It is dimensionally stable and can be used in greenhouses, industrial buildings, urban buildings and other fields.With the continuous surge in demand for PC sheets, small and large manufacturers have sprung up like bamboo shoots after a rain. So, how should we judge the strength of these manufacturers? It mainly depends on whether the co-extrusion process used meets the standard.Unique engineering exteriorCo-extrusion molding is currently the most widely used processing method in PC sheet production. The extrusion process can be divided into two stages: the first stage is to plasticize the solid plastic, and under pressure, it passes through a special form of die to become a continuum similar to the shape of the mouth pattern; the second stage is to use Appropriate treatment methods make the extruded continuum lose its plastic state and become solid, that is, the desired product.Generally, extrusion molding can continuously produce semi-finished profiles, pipes, sheets, films, etc. Multi-layer sheet extrusion generally means that two-layer, three-layer or even more sheets are layered together in a certain way to form a multi-layer sheet, so it also has advantages that some single-layer sheets do not have. In the co-extrusion process, several criteria are the key to distinguish the pros and cons of the production process.Factory raw material storage areaMaterial pretreatmentIn the process of processing PC sheets, the drying and degassing of materials is an essential step. Experience has proved that in the sheet extrusion process, degassing is of great help to increase the yield, even in high humidity areas, degassing is necessary. In addition, if the pellets are not well preserved and the water content is large, drying is also an essential step. However, for the protective layer of weather-resistant material with anti-ultraviolet function, degassing treatment is not necessary, because the ultraviolet absorber is a volatile substance, but the pre-drying step cannot be omitted.Tank temperatureFor the main extruder, during processing, the melt temperature at the end of the screw is between 270°C and 300°C. According to the principle of temperature control, from the beginning of the hopper to the end of the nozzle, the temperature of the barrel decreases from 300°C to 270°C, and drops to 250°C-260°C in the degassing zone. Basically, the barrel temperature of the co-extruder is about 20°C lower than the temperature of the base material.Factory production areaThe temperature of the subsequent deviceFor subsequent devices, such as filter screens, melt pumps, co-extrusion adapters, and sheet die heads, all should match the temperature of the last section of the barrel as much as possible.Temperature control equipment temperatureFor thin multilayer sheets, temperature control equipment is essential. After the sheet is shaped, the sheet needs to be reheated to 130°C~140°C by an infrared heating device to avoid stress and distortion.Traction speedThe maximum pulling speed of the multilayer sheet is usually determined by the shaping process, and at the same time depends on the mass or thickness per unit area.Imported production equipmentOf course, these standards are just the basis for the production of PC sheets. If you want to process high-quality PC sheets, you need to optimize the processing methods. Usually the work that needs to be done to optimize the process is: keep the melt temperature as low as possible; keep the accuracy of the upper and lower ends of the nozzle: keep the space between the nozzle and the shaping mold to a minimum; keep the partial vacuum of the first shaping mold as much as possible: keep the shaping area The lowest possible temperature.In addition, at the end of production, the extruder should be idling, and the temperature of all equipment should be maintained between 160°C and 170°C. If cleaning is required after the end of production, it is best to use high-viscosity PE on the extruder, which is conducive to the subsequent cleaning work.
Fuwen Township Central Primary School, Chun'an CountyThis colorful rural elementary school is not a special effect production, but a central elementary school in Fuwen Township, Chun'an County, Hangzhou City, which has the title of "China's Most Beautiful Rural Elementary School". The design of Fuwen Township Central Primary School in Chun'an County is inspired by the image of gray-red sloping roofed mountain village homes and undulating mountains, which are most familiar to school children. A climbing ladder, cable bridge, slope, and curved corridor are like winding mountain trails. The three-dimensional passage is interwoven with bamboo forests, fruit trees, mountain flowers and small ponds.Connecting various themed cabins of different elevations and children's scales-classrooms, reading, games, communication, exploration, observation and other spaces into a miniature mountain village-style magical three-dimensional new world, it is more like children being free in nature A kind home to grow up.The most impressive and dreamy color of Fuwen Township Central Primary School in Chun'an County comes from the innovative environmentally friendly building material-PC board. The color selection of PC board is rich, and products with different colors and different transparency can be selected according to needs, so as to design architectural styles with various artistic effects. The shapes and colors created by different modules give people a beautiful enjoyment.A variety of red and purple series of PC board facades customized by the school in the factory, combined with local fragmented tile inlay technology, terrazzo ground, finished bamboo-like wave plastic wood panels, and freely foldable doors and windows create a bright green mountain and green valley , Colorful, children’s world in dialogue with mountains, sky, breeze and starry sky, health, art, and natural living place. This is exactly what children, teachers and parents want, and it is also the place in most urban or rural schools. missing.In addition, as a public building, the school gathers a large number of people within a certain period of time, and safety is of paramount importance. The outstanding advantage of PC board is that it has high strength and can resist hail damage, mechanical damage and other damage. In addition, the PC board also meets the requirements of flame-retardant materials after testing by the National Fireproof Building Material Quality Supervision and Inspection Center. Conducive to fire prevention. In addition, the surface of the PC board has a 50-micron-thick UV protection layer, which can ensure that children will not be harmed by the sun when they have fun playing without affecting sufficient light.At the same time, the environmental protection characteristics of PC board are also amazing. PC board has excellent light transmittance, which can make full use of natural light and reduce artificial lighting. PC board can also be recycled, can be processed repeatedly, and waste products and leftover materials can be recycled, which will not cause environmental pollution.In fact, not only is the Fuwen Township Central Primary School in Chun'an County, PC panels also play an important role in many well-known buildings. The roofs of the 2006 World Cup in Germany, the main stadium of the 2002 World Cup in Jeonju in South Korea, the Norwegian Stadium and the main stadium of the Athens 2004 Olympic Games opening and closing ceremonies are made of hard, highly transparent PC panels.Especially the roof of the main stadium in Athens in 2004, which also set an "Olympic record" at that time, was the largest open-air stadium roof, the largest transparent roof, and the largest roof that was assembled and then installed. It was hailed as an architectural miracle. It is believed that with the continuous advancement of PC board production technology, more and more dream buildings will appear in front of the world.