Traditional testing is difficult to meet the depth of the industry. How can Film test high and low temperature box break through?

1. Differentiation of industrial demand: the driving force of reliability upgrade
The three main film application fields of film and television, medical treatment, and industrial flaw detection have given rise to completely different temperature resistance requirements due to differences in scene characteristics. Film and television films travel in the creative scene of changing light and shadow, from outdoor shooting under the scorching sun in the desert to capturing the starry sky on a cold night in the snowy mountains. The temperature difference between day and night is far beyond the conventional laboratory environment. This drastic temperature fluctuation requires the film to maintain color stability at high temperatures and maintain the flexibility of the emulsion layer at low temperatures to avoid brittle cracks and image defects. Medical films are responsible for life diagnosis, especially in the cold chain transportation link. Long-term storage in low-temperature environments must not only ensure that the image clarity is not damaged, but also prevent the film from chemically changing due to changes in temperature and humidity, which affects the accuracy of diagnosis. Industrial flaw detection films focus on the detection of hidden dangers inside the equipment. Stability under high temperature conditions is related to the accuracy of defect identification. Any fluctuations in film performance caused by heat leakage or uneven temperature field of the equipment may cover up key cracks or pores, causing safety hazards.
These differentiated needs are like precise locators, forcing the test standards of Film test high and low temperature box to be refined. Traditional universal testing can no longer meet the requirements of in-depth development of the industry. Only by customizing standards for pain points in various fields can the data output by the equipment truly reflect the temperature resistance performance of the film in real scenes. In this sense, the differentiation of industrial demand is no longer a development shackle, but has become the core engine to promote the reliability upgrade of Film test high and low temperature box.
2. Standard customization: Building an industry adaptability test system
In response to the dynamic temperature difference challenges of film and television films, industry standards have taken the lead in focusing on the temperature change capability of Film test high and low temperature box. The traditional equipment's uniform temperature rise and fall mode has been broken, replaced by a nonlinear temperature change curve that simulates the natural environment. The temperature rise stage needs to simulate the sudden heat of the desert at noon, reaching the high temperature extreme value in a short time with a specific acceleration; the temperature drop in the cold night is reproduced in the cooling stage, requiring the equipment to accurately reach the low temperature threshold within the specified time. This dynamic temperature change assessment not only tests the response speed of the equipment temperature control system, but also puts forward strict requirements on its temperature tracking accuracy. In order to ensure that the film can obtain a real environment simulation at each node during the temperature change process, the standard stipulates that the temperature overshoot during the temperature change process must be controlled within a very small range to eliminate test distortion caused by excessive temperature fluctuations.
The low temperature test standard for medical film revolves around "stability" and "durability". In addition to the conventional low temperature setting, the standard extends the test time dimension, requiring the Film test high and low temperature box to maintain a constant environment at a specific low temperature value for a significantly longer time to simulate the long-term storage state of the film in the cold chain logistics. Humidity control is also included in the core indicators, and the risk of film mildew caused by water vapor condensation is avoided by building a stable low-humidity environment in the box. The temperature uniformity assessment of the equipment is further refined, requiring that the temperature difference between any two points in the box should not exceed a specific range under long-term low-temperature conditions, ensuring that the films tested in the same batch are subjected to uniform environmental tests and improving data comparability.
The high-temperature test standards for industrial flaw detection films focus on "purity" and "precision". In addition to conventional high-temperature tolerance testing, the standard puts forward almost stringent requirements for the sealing of the Film test high and low temperature box. The equipment needs to control the heat leakage rate at an extremely low level under high-temperature conditions to prevent the external environment heat from penetrating into the temperature field of the box. The vibration suppression index was also included for the first time. Considering that there are many mechanical vibration sources in industrial sites, the standard stipulates that the equipment must control the internal vibration intensity within the threshold through a special shock-absorbing structure when running at high temperatures to avoid displacement of the film emulsion layer due to vibration, which affects the clarity of the flaw detection image. These new standards are like precision filters, filtering external interference factors layer by layer to ensure that the test environment is as close to the real high-temperature scene of industrial flaw detection as possible.
3. Performance dimension extension: consolidate the physical foundation of reliability
The upgrade of the local standard for the Film test high and low temperature box not only stays in the optimization of the test process, but also goes deeper into the physical dimension of the equipment performance. The sealing test has been expanded from a single box sealing inspection to a full system airtightness assessment. All possible leaking parts of the equipment, such as the door seal structure, pipeline interface, sensor perforation, etc., must be verified by high-precision detection methods such as helium mass spectrometry leak detection. This all-round sealing control enables the equipment to maintain a stable internal environment under high temperature and high pressure or low temperature and low pressure conditions, and completely eliminates temperature field fluctuations caused by gas exchange.
The specification of vibration suppression performance breaks through the simple application of traditional shock-absorbing pads. The standard requires that the key components inside the equipment adopt a suspended installation structure, which is isolated from the box through elastic support components, and cooperates with the active shock absorption control system to monitor and offset external vibration transmission in real time. During high temperature testing, even if the equipment is placed in a vibration environment, the vibration acceleration of the internal film sample can be controlled within a range that does not affect the performance test. This systematic upgrade from structural design to intelligent control provides an unprecedented stable platform for high temperature flaw detection film testing.
The accuracy requirements of temperature and humidity sensors have also been pushed to new heights. Local standards stipulate that the sensors equipped with the equipment must have higher resolution and repeatability to ensure that reliable data can be provided under extreme temperature and humidity conditions. The calibration cycle of the sensor is greatly shortened, and a multi-point calibration method is required to establish a compensation model for the temperature and humidity characteristics of different areas inside the equipment. This refined sensor control allows the Film test high and low temperature box to capture environmental parameters at a "micro" level, providing accurate data support for test objects that are sensitive to temperature and humidity, such as medical films.