Patent ID: 7993558

Claim:
A sheathing method for continuously sheathing a ply of threads with at least one of a thermoplastic and a viscoelastic material, said ply of threads being formed by an array of approximately mutually parallel threads running in a given direction through a sheathing device that comprises: a thread guide; a coating chamber into which a first feed channel and a second feed channel, which are independent of each other, run; a first feed means connected to the first feed channel configured to deliver a first material under a first pressure and with a defined flow rate; a second feed means connected to the second feed channel configured to deliver a second material under a second pressure and with the defined flow rate; an outlet of the first feed channel arranged above a plane of the ply of threads; an outlet of the second feed channel arranged below the plane of the ply of threads; an output die through which the ply of threads runs when the device is in operation; a controller for controlling the pressure of each of the feed means; and at least two pressure-measuring means each coupled to the controller and located in the coating chamber facing and in line with each other, on either side of the plane of the ply and in an immediate vicinity of the outlet of the respective feed channels, the method comprising: measuring a pressure by each of the at least two pressure-measuring means; and regulating the first and the second feed means such that a pressure difference between the at least two pressure-measurement means located in the coating chamber is zero.