Description
Polyimide (PI) is a semi-transparent and very thin material with extremely high dielectric strength. When there is space, weight restrictions, or when heating sheets need to come into contact with vacuum, oil, or chemical materials, polyimide (PI) heating elements are good choice.The performance/characteristics of polyimide heating film: It can be used in vacuum environments and can resist most chemical substances.
Flexible polyimide film heating element is a flexible element made of special polymer materials. It is like a transparent sticky note that can generate heat. Its thickness is usually only 0.1-0.3 millimeters, It can be easily bent and fit onto complex or curved surfaces, ensuring effective heat transfer.Yet it can withstand temperatures above 200℃. Its core consists of three layers: two polyimide films on the top and bottom wrap the middle resistance heating layer. This sandwich structure gives it both flexibility and durability.
Polyimide film heaters can physically resist ozone, moisture and fungi. Although most medical devices operate in controlled environments and require great care, this is not always the case. Just like any other industrial equipment, these components are prone to moisture and bacterial or fungal growth if not properly maintained. Thanks to its physical resistance, the film flexible heater components can function effectively.
Are you curious about why some medical devices can precisely control temperature and be ultra-thin and soft? The answer lies in the polyimide film heater! This "black technology" material has advantages such as high temperature resistance, strong flexibility, safety and reliability, and is widely used in surgical insulation blankets, physiotherapy devices, and portable medical equipment.
In fact, polyimide heating films have long been deeply integrated into the high-end medical field👇:
1. Surgical insulation blanket / Intraoperative insulation system: In the operating room, patients' body temperature tends to drop. The PI heating film is embedded in the insulation blanket to achieve uniform and constant temperature heating, avoiding the risk of low temperatures and enhancing surgical safety.
2. Portable therapeutic devices: Shoulder and neck massagers, knee joint patches, etc. With the PI film, they can quickly heat up and precisely control the temperature, preventing local overheating and burns.
3.Ex vivo diagnostic equipment (IVD): Such as PCR detectors, blood sample temperature control modules, which require temperature fluctuations to be controlled within ±0.5℃. The PI heating film responds quickly and has a uniform temperature field, making it an ideal choice.
Polyimide film heater for medical devices can physically resist ozone, moisture and fungi. Although most medical devices operate in controlled environments and require great care, this is not always the case. Just like any other industrial equipment, these components are prone to moisture and bacterial or fungal growth if not properly maintained. Thanks to its physical resistance, the polymide film heater can function effectively.
The temperature control accuracy of medical devices is extremely strict. Choosing the wrong polyimide film heater can easily result in temperature lag or localized overheating.
How to select the polyimide film heater for medical devices? The key lies in precise matching of resistance and power supply voltage, proper size to fit the heat source, and meeting the requirements for temperature resistance and insulation. The focus is on whether the ohmic value is compatible with the driving circuit, and whether the flexible substrate can withstand repeated bending; at the current stage, the selection also needs to take into account biocompatibility and long-term aging stability to avoid rework in the future.
The performance of the polyimide heating film is jointly defined by three elements: the characteristics of the substrate, the layout of the resistance wires, and the electrical parameters. None of these three can be omitted. The resistance wire etching process determines the uniformity of heat generation. Medical-grade products generally require a temperature difference of ≤ ±3℃, and the layout density needs to be dynamically adjusted according to the heat load.
The polyimide film heater is resistant to solvents, thin and lightweight, and has excellent tensile strength, dimensional stability and tear resistance. All these characteristics make them an ideal choice for applications in heating elements of blood, liquids, endoscopes and several other medical devices.
The polyimide heating films in the main price range can already meet the basic requirements of most medical scenarios. Greater investment should be focused on customization and reliability verification.When the equipment enters mass production or is used for Class III medical devices, it is recommended to upgrade to any customized service of the desired specification. Design the irregular contours based on the actual installation space (such as a ring with an outer diameter of 22mm and an inner diameter of 4mm, or a ring with ears of 46mm by 32mm, etc.). Although the unit price will increase, it avoids the risk of subsequent modifications.
Polyimide heating film can heat specific areas that require heating. All you need to do is place it on the surface of the component. Its thin structure can provide a tight thermal coupling between the electric heater and the heat sink. In areas with significant heat loss, a higher power density configuration for heating mode can even be specified. In comparative experiments, when using containers with the same power to boil the same amount of water, the heating film electric cooker saves 50% of electricity compared to the electric stove. The polyimide heating film heater has obvious energy-saving effects.
Choosing a polyimide heater is not merely selecting a heat source; it is also choosing a strategic component that can optimize system design, enhance the performance and reliability of end products. By eliminating the volume and response bottlenecks of traditional heating solutions, it provides engineers with unprecedented design flexibility and thermal control accuracy.
Difference between the PI and PET:
1.The appearance, the PET film is a transparent electric heating film, while the polyimide film heating element is an opaque one.
2.Differences in temperature resistance: PET is a low-temperature electric heating film, and the maximum temperature it can withstand for a long time is relatively low. The maximum temperature of PET film can reach 80°C, but for safety reasons, at this temperature, the electric heating film must be equipped with a temperature controller. Generally, the temperature of the PET electric heating film is 50 + 5°C. PI film is a high-temperature electric heating film, and it can withstand temperatures up to 250°C for a long time. However, for safety reasons, the normal temperature setting for PI film is 120 + 5°C.
Features:
Thin and lightweight design: The heater is made of thin and flexible Kapton polyimide film, making it easy to install and integrate in narrow spaces or complex geometries. It also ensures that heat is quickly and evenly transferred to the target surface or component.
High temperature resistance: The Kapton film has excellent thermal stability and can withstand temperatures up to 200 degrees, depending on the specific model and rated power. This enables the heater to be used in harsh environments or extreme operating conditions.
Customizable size and shape: The heater can be configured to meet the specific requirements of each application in terms of size, power, voltage, and other parameters. It can be cut, bent, or shaped to fit different surfaces or contours.
Performance is safe and reliable: The heater is designed and manufactured using high-quality materials and processes to ensure consistent performance over time. It also includes safety features such as grounding layers, temperature sensors, and insulation coatings to prevent overheating or electrical failures.
Application
Heating for LCD Displays: Flexible polyimide film heating element can be used to maintain the temperature stability of LCD displays, preventing condensation, fogging or icing in low-temperature environments.
Heating for Medical Equipment： This film heater can be used in medical equipment such as incubators, warming blankets or surgical tools, providing local or uniform heating for patients or specimens.
Heating for Aerospace and Defense: This flexible film heater can be used in aircraft components, satellites, missiles or tanks to prevent icing, condensation or thermal shock during operation.
Heating for Laboratory Instruments: It can be used in analytical instruments, microscopes or reaction vessels to maintain precise and stable temperatures for samples or experiments.
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