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Polyether ether ketone (PEEK) film is a linear aromatic polymer film, which has a series of outstanding properties, such as excellent mechanical properties, heat resistance, flame retardancy, abrasion resistance, corrosion resistance, hydrolysis resistance, peel resistance and biocompatibility. Because PEEK film has such excellent performance, so it has become a polyaryletherketone (PAEK) family of the most in-depth research, the most widely used in the classic representative of the commercialisation.
First, the basic characteristics of PEEK film
At present, the production of PEEK film is mainly prepared by extrusion casting method, due to the PEEK film casting equipment has a certain speed, so the film in the longitudinal direction will experience a certain amount of stretching. In addition, the temperature and speed of the PEEK film casting equipment also directly affect the structure, morphology and thickness of the film. When the film thickness is the same, the higher the crystallinity, the lower the transmittance. The haze of the film can also reflect the colour state of the film. The higher the crystallinity, the higher the haze value. When the crystallinity is less than 5%, the film shows high transparency.
Second, PEEK film casting equipment process requirements
To complete the smooth production of PEEK film, the corresponding production equipment will put forward certain requirements, the current requirements of the PEEK film casting equipment screw parameters for the L / D ratio L / D: 24: 1 ~ 30: 1, feed section: > 8D, compression ratio CR: 2 ~ 3, and the recommended type of screw must be a cylinder heating circle must be able to maintain 400 ¡æ, it is recommended to use at least four independent heating zones It is recommended to use at least four independent heating zones, each with independent thermocouples and Proportional Integral Derivative (PID) controllers for precise temperature control, and the temperature should be controlled within ¡À2¡æ.
It is also important to note that extruder size and machine throughput should be matched, ideally with a dwell time of less than 30 minutes. Running at low screw speeds (<10rpm), for example, the extrusion process will result in longer residence times and increase the chances of gel degradation. All internal surfaces should be free of ¡®dead space¡¯ and cleaned and polished before extrusion starts; the head perforated plate helps to create back pressure in the screw and stops the rotation of the melt. The hole size should be proportional to the size of the extruder and designed to eliminate as much dead space as possible, and the holes should be chamfered to enhance flow.
Typically, a strainer set is placed in front of the filter to remove any residual impurities from the material. If the filter is too fine, it can create excessive shear and pressure drop in the melt. Dead spots/low flow rates can lead to localised degradation, resulting in discolouration of the material or black spots in the melt. Therefore the flow through the head, die and mould should have a streamlined transition, the cross-sectional change should be gradual and the joints must be aligned without gaps. Analogue simulations of the system can be performed to ensure that there are no low flow areas.
It is recommended to use individually controlled heaters for each section (head, flange, mould) and to apply insulation wherever possible. Slit dies are commonly used to process natural PEEK flakes and controlling the temperature of the die lip is essential for good surface finish and dimensional control. Thin sheets (<500¦Ìm) can be produced in semi-crystalline or amorphous form by controlling the temperature of the rollers. Roller temperatures below Tg will produce amorphous transparent films, while temperatures above 170¡ãC will produce opaque semi-crystalline films. Thicker films can crystallise under their own retained heat.
Nanjing Suminoe Precision Machinery Co., Ltd. specialises in the production of release paper coating machine, the company is committed to creating a coating machine production line with uniform coating, high flatness and cleanliness. The company mainly deals with coating machine production lines such as release paper coating machine, optical film coating machine, automotive heat insulation film coating machine, water treatment film coating machine, aluminium foil coating machine, dimming glass coating machine, film coating machine, PDLC dimming film coating machine, lithium battery extrusion coating machine, laboratory lithium coating machine and so on.
First, the basic characteristics of PEEK film
At present, the production of PEEK film is mainly prepared by extrusion casting method, due to the PEEK film casting equipment has a certain speed, so the film in the longitudinal direction will experience a certain amount of stretching. In addition, the temperature and speed of the PEEK film casting equipment also directly affect the structure, morphology and thickness of the film. When the film thickness is the same, the higher the crystallinity, the lower the transmittance. The haze of the film can also reflect the colour state of the film. The higher the crystallinity, the higher the haze value. When the crystallinity is less than 5%, the film shows high transparency.
Second, PEEK film casting equipment process requirements
To complete the smooth production of PEEK film, the corresponding production equipment will put forward certain requirements, the current requirements of the PEEK film casting equipment screw parameters for the L / D ratio L / D: 24: 1 ~ 30: 1, feed section: > 8D, compression ratio CR: 2 ~ 3, and the recommended type of screw must be a cylinder heating circle must be able to maintain 400 ¡æ, it is recommended to use at least four independent heating zones It is recommended to use at least four independent heating zones, each with independent thermocouples and Proportional Integral Derivative (PID) controllers for precise temperature control, and the temperature should be controlled within ¡À2¡æ.
It is also important to note that extruder size and machine throughput should be matched, ideally with a dwell time of less than 30 minutes. Running at low screw speeds (<10rpm), for example, the extrusion process will result in longer residence times and increase the chances of gel degradation. All internal surfaces should be free of ¡®dead space¡¯ and cleaned and polished before extrusion starts; the head perforated plate helps to create back pressure in the screw and stops the rotation of the melt. The hole size should be proportional to the size of the extruder and designed to eliminate as much dead space as possible, and the holes should be chamfered to enhance flow.
Typically, a strainer set is placed in front of the filter to remove any residual impurities from the material. If the filter is too fine, it can create excessive shear and pressure drop in the melt. Dead spots/low flow rates can lead to localised degradation, resulting in discolouration of the material or black spots in the melt. Therefore the flow through the head, die and mould should have a streamlined transition, the cross-sectional change should be gradual and the joints must be aligned without gaps. Analogue simulations of the system can be performed to ensure that there are no low flow areas.
It is recommended to use individually controlled heaters for each section (head, flange, mould) and to apply insulation wherever possible. Slit dies are commonly used to process natural PEEK flakes and controlling the temperature of the die lip is essential for good surface finish and dimensional control. Thin sheets (<500¦Ìm) can be produced in semi-crystalline or amorphous form by controlling the temperature of the rollers. Roller temperatures below Tg will produce amorphous transparent films, while temperatures above 170¡ãC will produce opaque semi-crystalline films. Thicker films can crystallise under their own retained heat.
Nanjing Suminoe Precision Machinery Co., Ltd. specialises in the production of release paper coating machine, the company is committed to creating a coating machine production line with uniform coating, high flatness and cleanliness. The company mainly deals with coating machine production lines such as release paper coating machine, optical film coating machine, automotive heat insulation film coating machine, water treatment film coating machine, aluminium foil coating machine, dimming glass coating machine, film coating machine, PDLC dimming film coating machine, lithium battery extrusion coating machine, laboratory lithium coating machine and so on.