Patent DE-102008002392-A1 (DE)
Title: Manufacturing belts for machine to produce fibrous material web e.g. paper and cardboard, comprises producing longitudinal reinforcing layer from helically progressive filaments of thread-like/strip-like longitudinal reinforcing material
Inventor: KOECKRITZ UWE
IPC: D04H3/04
Filed: 2008-06-12
Abstract: The method comprises producing a longitudinal reinforcing layer (2) from helically progressive filaments of a thread-like or strip-like longitudinal reinforcing material (3, 3') in the direction of the width of the belts (1), producing a transverse reinforcing layer (6) by arranging and section-wisely holding in position a thread-like or strip-like transverse reinforcing material (7) extending in its longitudinal extension transverse to the longitudinal extension of the longitudinal reinforcing material by using a holding device, and joining the transverse layer with the longitudinal layer. The method comprises producing a longitudinal reinforcing layer (2) from helically progressive filaments of a thread-like or strip-like longitudinal reinforcing material (3, 3') in the direction of the width of the belts (1), producing a transverse reinforcing layer (6) by arranging and section-wisely holding in position a thread-like or strip-like transverse reinforcing material (7) extending in its longitudinal extension transverse to the longitudinal extension of the longitudinal reinforcing material by using a holding device, joining the transverse reinforcing layer with the longitudinal reinforcing layer, and releasing the transverse reinforcing material from the holding device after the joining. The longitudinal reinforcing material and/or the transverse reinforcing material are formed by threads, a band of threads separated to each other or a web-shaped surface structure with smaller width than the width of the longitudinal reinforcing layer, which extends in the machine direction of the belts. The transverse reinforcing material is laid on the longitudinal reinforcing layer during its arrangement. The transverse reinforcing material extends transverse to the longitudinal extension of the longitudinal reinforcing material in a section-wise manner and is kept in an area of longitudinal edges of the longitudinal reinforcing layer by the holding device. The holding device comprises a first holding hook, which is arranged in the area of one longitudinal edge of the longitudinal reinforcing layer, and a second holding hook, which is arranged in the area of the other longitudinal edge of the longitudinal reinforcing layer, where the transverse reinforcing material extending from one holding hook to the other hook is kept itself through the oppositely-lying holding hooks. An inserting device is used for arranging the transverse reinforcing material and traverses back and forth between the longitudinal edges of the longitudinal reinforcing layer for section-wise arrangement of the transverse reinforcing material perpendicular to the longitudinal reinforcing material. During the back and forth traverse of the inserting device, the transverse reinforcing material is alternatively laid in one hook and the other opposite hook. The transverse reinforcing material is arranged, so that it extends itself to the width of the longitudinal reinforcing layer. The holding hooks are distanced to each other, so that the transverse reinforcing material is arranged on the width of the longitudinal reinforcing layer. Several longitudinal reinforcing layers and transverse reinforcing layers are formed and are arranged to each other. The transverse reinforcing material of the transverse reinforcing layers, which lie one upon the other, intersects in a section-wise manner. The transverse reinforcing material is bound with the longitudinal reinforcing layer by needling, adhering, fusing or welding. The transverse reinforcing layers and the longitudinal reinforcing layers that are bound with one another form a basic structure of a press felt, where the basic structure is needled with a fiber non-woven layer in single- or double-side.