1. A process for manufacture of a reinforcing insert comprising:
forming superposed fiber layers,
joining together an assembly of said superposed layers by stitching without tying off or with tying off and pressing, by means of a joining fiber crossing through said layers so as to form fiber sections, at least some of said sections being rectilinear,
impregnating the assembly thus obtained with a resin,
polymerizing said resin to form a composite material part,
removing said composite material part from a mold,
wherein:
the total fiber density making up the reinforcing insert is comprised of between 50% and 60% of a volume of the reinforcing insert, and fiber sections occupy between 3% and 10% of the volume of the reinforcing insert, and
the impregnation operation is conducted so as not to compress said assembly thus obtained so that said sections remain rectilinear.
2. The process according to claim 1, further comprising that the impregnation operation is conducted by executing the following successive steps:
said assembly is positioned in a flexible closed container having an opening,
this container is placed in a vacuum oven and the container is heated to an impregnation temperature,
said resin is injected in the viscous state into the container opening to impregnate said assembly.
3. The process according to claim 2, further comprising that said assembly is held vertically without stress in said container by two metal plates.
4. The process according to claim 2, further comprising that said oven is placed under vacuum after injection of said resin, and in that atmospheric pressure is re-established once the air is evacuated from the container so that said resin completely impregnates said assembly.
5. The process according to claim 2, further comprising that said container is a heat-sealed plastic film.
6. The process according to claim 1, further comprising that fiber sections occupy between 3% and 6% of the insert volume.
7. The process according to claim 6, further comprising that fiber sections occupy between 4.5% and 5% of the insert volume.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of manufacturing paper in a papermaking machine, the method comprising:
performing a substantially X-shaped cut in a traveling continuous paper web of the papermaking machine, the substantially X-shaped cut forming at least a substantially V-shaped tail for ending a forming roll, an opposite substantially V-shaped start for starting a new spool, a detachable first wing and a detachable second wing;
detaching the detachable first wing and the detachable second wing from the traveling continuous paper web; and
distancing the substantially V-shaped tail from the substantially V-shaped start by allowing the substantially V-shaped start to engage a new spool.
2. The method of manufacturing paper of claim 1, further comprising applying an adhesive on at least a portion of the traveling continuous paper web so that following the defining of the substantially X-shaped cut, there is adhesive applied on at least the detachable first wing and the detachable second wing.
3. The method of manufacturing paper of claim 2, wherein the applying an adhesive is so that following the defining of the substantially X-shaped cut, there is adhesive applied on the substantially V-shaped start, thereby allowing the substantially V-shaped start to engage the new spool.
4. The method of manufacturing paper of claim 1, wherein the detaching is done by allowing the detachable first wing and the detachable second wing to engage a surface of a driving drum of the papermaking machine as a respective detached first wing and a respective detached second wing.
5. The method of manufacturing paper of claim 4, further comprising removing the detached first wing and the detached second wing from the surface of the driving drum.
6. The method of manufacturing paper of claim 5, wherein the removing is done by scraping a surface of the driving drum.
7. The method of manufacturing paper of claim 1, wherein the substantially X-shaped cut further forms a middle strip that connects the V-shaped tail and the V-shaped start.
8. The method of claim 7, further comprising applying an adhesive on at least a portion of the middle strip, thereby allowing the at least portion of the middle strip and the connected V-shaped start to engage the new spool.