摘要:
A method of press moulding a moulding material to form a vehicle body panel of fibre- reinforced resin matrix composite material, the vehicle body panel having a front A-surface and a rear B-surface, the method comprising the steps of: i. providing a heated mould tool having a lower mould part (58) and an upper mould part (60), the upper mould part (60) having a first moulding surface (62) for moulding a front A-surface of the vehicle body panel and the lower mould part (58) having a second moulding surface (70) for moulding a rear B-surface of the vehicle body panel; ii. providing a multilaminar panel of moulding material (66) comprising at least one layer of fibres and at least one layer of resin, the multilaminar panel having first and second opposite major surfaces (68, 70), a surface resin layer of the multilaminar panel being at or adjacent to the first major surface; iii. locating the moulding material (66) in the mould tool; iv. closing the mould tool to define a substantially closed mould cavity containing the moulding material (66); v. applying pressure to the moulding material (66) in the mould cavity to configure the moulding material (66) in a fully moulded shape; and vi. substantially fully curing the resin to form a vehicle body panel from the moulding material (66), the vehicle body panel having a front A-surface formed from the first major surface (68) and a rear B-surface formed from the second major surface (70).
摘要:
A nanoimprint system and methods for separating imprinted substrates with nano-scale patterns from mold for manufacturing. Generally, the system includes means to create, monitor, and control relative movement between the mold and substrate for separation. It is capable of controlling where and when the separation happens and finishes. The relative movement may be generated by motion stages, springs, stage driven flexures, inflatable O-rings, gas flow, and other mechanical means. It may be monitored by separation force, overhead camera, and vacuum/pressures in different area of the system. The relative movement may be any combination of stages movements and movement sequences. The separation speed, direction, and force can be well controlled in the system to achieve fast and reliable separation between mold and substrate, and at the same time maintain the pattern shape and details on the consolidated imprint resist.
摘要:
A method of press moulding a moulding material to form a moulded part of fibre-reinforced resin matrix composite material, the method comprising the steps of: i. providing a mould tool having a lower mould part (58) and an upper mould part (60), the upper mould part (60) having a first moulding surface (62) for moulding a first moulded surface of the moulded part and the lower mould part (58) having a second moulding surface (64) for moulding a second moulded surface of the moulded part; ii. providing a multilaminar panel of moulding material (66) comprising at least one layer of fibres and at least one layer of resin, the multilaminar panel having first and second opposite major surfaces (68, 70); iii. locating the moulding material (66) in the mould tool; iv. progressively closing the mould tool to define a substantially closed mould cavity (90) containing the moulding material (66), the closing step including: a. a preliminary closing phase to achieve mutual engagement between the lower and upper mould parts (58, 60), b. a secondary closing phase after engagement between the lower and upper mould parts with the mould tool partially closed to define a closed intermediate cavity containing the moulding material (66), the closed intermediate cavity (95) being larger than the moulded part (66) and the first moulding surface (62) of the upper mould part (60) being spaced from the first major surface by a spacing distance, in the secondary phase air being at least partially evacuated from the closed intermediate cavity (95) while the first moulding surface (62) of the upper mould part (60) is spaced from the first major surface (68) to provide a vacuum pressure, and c. a tertiary closing phase after the vacuum pressure has been provided in the closed intermediate cavity (95), the tertiary phase having: I. a first stage prior to both the first moulding surface (62) contacting the first major surface (68) and the second moulding surface (64) contacting the second major surface (70), and II. a second compression stage after both the first moulding surface (62) has contacted the first major surface (68) and the second moulding surface (64) has contacted the second major surface (70), the closure speed of relative movement between the lower and upper mould parts (58, 60) being higher in the first stage than in the second compression stage; v. applying pressure to the moulding material (66) in the mould cavity to configure the moulding material (66) in a fully moulded shape; and vi. substantially fully curing the resin to form a moulded part from the moulding material (66).
摘要:
There is provided an apparatus for molding a thermoplastic material into a homogenous sample body having a predetermined shape, the apparatus comprising: (a) a main body (110) comprising a first opening (112), a second opening and a hollow bore (116) connecting the first opening (112) with the second opening, the hollow bore (116) being adapted to receive a separation foil shaped to cover at least a part of the hollow bore surface; (b) a piston (120) adapted to fit moveably into the hollow bore (116) containing the separation foil; (c) a base plate (130) comprising a protrusion, wherein the base plate (130) is adapted to be inserted into the first opening (112) in such a manner that the protrusion extends into a part of the hollow bore (116) containing the separation foil, and wherein the base plate (130) is adapted to transfer heat from a heating unit to a thermoplastic material (150) resting on the protrusion (132); (d) a vacuum connector (142) adapted to be connected to a vacuum source; (e) a lid (140) adapted to fit moveably into the second opening and adapted to apply a force to the piston (120) when the vacuum connector (142) is connected to the vacuum source such that the piston (120) applies a compressing force to the thermoplastic material (150) resting on the protrusion. There are further provided a method and a system for molding a thermoplastic material into a homogenous sample body having a predetermined shape.
摘要:
A method of press moulding a moulding material to form a moulded part of fibre-reinforced resin matrix composite material, the method comprising the steps of: i. providing a mould tool having a lower mould part (58) and an upper mould part (60), the upper mould part (60) having a first moulding surface (62) for moulding a first moulded surface of the moulded part and the lower mould part (58) having a second moulding surface (64) for moulding a second moulded surface of the moulded part; ii. providing a multilaminar panel of moulding material (66) comprising at least one layer of dry fibres and at least one layer of resin, the multilaminar panel having first and second opposite major surfaces (68, 70); iii. locating the moulding material (66) in the mould tool; iv. progressively closing the mould tool to define a substantially closed mould cavity containing the moulding material (66), the closing step having: I. a first stage prior to both the first moulding surface (62) contacting the first major surface (68) and the second moulding surface (64) contacting the second major surface (70) and II. a second compression stage after both the first moulding surface (62) has contacted the first major surface (68) and the second moulding surface (64) has contacted the second major surface (70), the second compression stage causing resin impregnation of the dry fibres,the closure speed of relative movement between the lower and upper mould parts (58, 60) being higher in the first stage than in the second compression stage;v. applying pressure to the moulding material (66) in the mould cavity to configure the moulding material (66) in a fully moulded shape; and vi. substantially fully curing the resin to form a moulded part from the moulding material (66).
摘要:
A process of compression molding an article from a curable resin is provided that includes opening a mold to an open position by displacing an upper die having an upper mold surface from a lower die having a lower mold surface. Resin is placed a mold surface and the dies are closed to an intermediate start position at a rate of from 1 to 10 cm/sec. The dies are then closed to a start position at a rate of between 25 and 60% of the rate of closure to the intermediate position. A shroud volume is evacuated for at least 3 seconds to a reduced pressure of less than 0.16 atmospheres while continuing to press toward a mold cavity volume at a rate of between 12 and 30% of the rate of closure to the intermediate start. The reduced pressure is removed as the full compression is applied.
摘要:
A method of press moulding a moulding material to form a moulded part of fibre-reinforced resin matrix composite material, the method comprising the steps of: i. providing a mould tool having a lower mould part (58) and an upper mould part (60), the upper mould part (60) having a first moulding surface (62) for moulding a first moulded surface of the moulded part and the lower mould part (58) having a second moulding surface (64) for moulding a second moulded surface of the moulded part; ii. providing a multilaminar panel of moulding material (66) comprising at least one layer of fibres and at least one layer of resin, the multilaminar panel having first and second opposite major surfaces (68, 70), a surface resin layer of the multilaminar panel being at or adjacent to the first major surface and a dry fibre layer of the multilaminar panel forming the second major surface; iii. locating the moulding material in the mould tool by disposing the second major surface on the second moulding surface of the lower mould part (58), the lower mould part (58) being at an elevated temperature as compared to the temperature of the moulding material (66); iv. closing the mould tool to define a substantially closed mould cavity containing the moulding material (66); v. applying pressure to the moulding material (66) in the mould cavity to configure the moulding material (66) in a fully moulded shape, and after the applying pressure step v the resin in the multilaminar panel fully impregnates the dry fibres; and vi. substantially fully curing the resin to form a moulded part (66) from the moulding material.
摘要:
A nanoimprint system and methods for separating imprinted substrates with nano-scale patterns from mold for manufacturing. Generally, the system includes means to create, monitor, and control relative movement between the mold and substrate for separation. It is capable of controlling where and when the separation happens and finishes. The relative movement may be generated by motion stages, springs, stage driven flexures, inflatable O-rings, gas flow, and other mechanical means. It may be monitored by separation force, overhead camera, and vacuum/pressures in different area of the system. The relative movement may be any combination of stages movements and movement sequences. The separation speed, direction, and force can be well controlled in the system to achieve fast and reliable separation between mold and substrate, and at the same time maintain the pattern shape and details on the consolidated imprint resist.
摘要:
A method of press moulding a moulding material to form a moulded part of fibre-reinforced resin matrix composite material, the method comprising the steps of: i. providing a mould tool having a lower mould part (58) and an upper mould part (60), the upper mould part (60) having a first moulding surface (62) for moulding a first moulded surface of the moulded part and the lower mould part (58) having a second moulding surface (64) for moulding a second moulded surface of the moulded part; ii. providing a multilaminar panel of moulding material (66) comprising at least one layer of dry fibres and at least one layer of resin, the multilaminar panel having first and second opposite major surfaces (68, 70); iii. locating the moulding material (66) in the mould tool; iv. closing the mould tool to define a substantially mould cavity containing the moulding material (66), the closing step including a compression stage, in which the first moulding surface (62) contacts the first major surface (68) and the second moulding surface (64) contacts the second major surface (70), the compression stage compressing the moulding material (66) to cause progressive resin impregnation of the dry fibres without increasing the resin pressure to a minimum threshold value to cause excessive resin bleed out from the cavity, optionally to reduce any resin bleed out to no more than 600 of resin per square metre of the moulding material; v. applying pressure to the moulding material (66) in the mould cavity to configure the moulding material (66) in a fully moulded shape; and vi. substantially fully curing the resin to form a moulded part from the moulding material (66).