Method for producing single-or multi-layered fiber preforms by the TFP process

A method for producing single- or multi-layered fiber preforms by the TFP process with fiber strands which are aligned such that they are oriented with a flux of force, wherein the fiber preforms have virtually any desired material thickness without troublesome backing layers and have virtually any desired surface geometry, comprising the steps of:

• a) providing a flexible and elastic base and a clamping frame, wherein the flexible and elastic base is accommodated in the clamping frame,
• b) providing supporting elements which are activatable by means of an open-loop and closed-loop control device, changing the surface geometry of the flexible and elastic base for adaptation to a surface geometry that is intended for the fiber preform before the laying and attaching of the fiber strands on the base, the base being formed by a rubber sheet or a silicone sheet,
• c) laying and attaching the fiber strands on the base with a fixing thread led through a sewing head to form the fiber preform, wherein the position of the sewing head with respect to the base is monitored in at least one spatial dimension by an open-loop and closed-loop control device, in order to make virtually any desired laying curves of the fiber strands on the base possible,
• d) inserting the fixing thread into the base by means of a needle arranged on the sewing head, such that the fixing thread is introduced into the base and fixing thread loops formed as a result are firmly held in the base,
• e) in addition to the fixing thread, fixing the fiber preform with an additional binder, wherein the binder is applied at least into or onto the fiber preform, and
• f) lifting the fiber preform off the base.

A method for producing single- or multi-layered fiber preforms by the TFP process with fiber strands which are aligned such that they are oriented with a flux of force, wherein the fiber preforms have virtually any desired material thickness without troublesome backing layers and have virtually any desired surface geometry, comprising the steps of:

• a) laying and attaching the fiber strands on a flexible and elastic base formed by a rubber sheet or a silicone sheet with a fixing thread led through a sewing head to form the fiber preform, wherein the position of the sewing head with respect to the base is monitored in at least two spatial dimensions by an open-loop and closed-loop control device, in order to make virtually any desired laying curves of the fiber strands on the base possible,
• b) providing supporting elements which are activatable by means of an open-loop and closed-loop control device, changing the surface geometry of the flexible and elastic base for adaptation to a surface geometry that is intended for the fiber preform before the laying and attaching of the fiber strands on the base, the base being formed by a rubber sheet or a silicone sheet,
• c) inserting the fixing thread into the base by means of a needle arranged on the sewing head, such that the fixing thread is introduced into the base and fixing thread loops formed as a result are firmly held in the base,
• d) in addition to the fixing thread, fixing the fiber preform with an additional binder, wherein the binder is applied at least into or onto the fiber preform,
• e) changing the surface geometry of the flexible and elastic base for adaptation to a surface geometry that is intended for the fiber preform after fixing the fiber preform, and
• f) lifting the fiber preform off the base.