Method and device for manufacturing a fibre moulding and a fibre moulding manufactured using these
A method and a device for manufacturing a fiber molding for drinks packaging containers having an improved structure and surface quality. The method includes the following steps: dipping of a forming wire arranged on a toolholder into a pulp slurry, lifting of the toolholder in order to move the covered forming wire completely out of the pulp slurry, compressing of the fiber material in an area of the circumferential edge of the forming wire through inflating of a circumferential collar, relaxing of the pressure in the collar, and removing of the fiber molding. A device for manufacturing of a fiber molding is also provided.
1. A method for manufacturing a head or base element for drinks packaging containers formed from a fibre moulding, the method comprising the following steps:
dipping of a moulding screen arranged on a toolholder, said moulding screen extending along an outer contour of a moulding tool, into a fibre-containing pulp slurry in order to cover the moulding screen with fibre material,
lifting of the toolholder in order to move the moulding screen covered with fibre material completely out of the pulp slurry,
compressing the fibre material in an area of a peripheral edge of the moulding screen through expansion of a sleeve arranged around the moulding tool and going all the way around the moulding screen,
relaxing pressure in the sleeve,
removing fibre moulding from the moulding screen,
transferring the fibre moulding onto a press tool, and
mechanically compacting the fibre moulding on the press tool with a geometry corresponding to the fibre moulding.
2. The method according to claim 1 , wherein an upper edge of the fibre moulding is sprayed with water before it is removed from the moulding screen.
3. The method according to claim 1 , wherein the moulding screen is adapted to have air applied to it from an inside in such a way that both an underpressure, for precipitation of the fibre material, and an overpressure for releasing and removing the fibre moulding can be applied.
4. The method according to claim 1 , wherein the fibre moulding is dried after removal.
5. The method according to claim 4 , wherein the drying takes place using compressed air.
6. The method according to claim 4 , wherein the drying takes place using thermal energy supplied.
7. The method according to claim 1 , wherein an inner and an outer surface of the fibre moulding are coated so as to be gas-tight and/or liquid-tight.
8. The method according to claim 1 , wherein an edge all the way around the fibre moulding is cut to length and an opening located in the fibre moulding is introduced.
9. The method according to claim 8 , wherein the cutting to length of the edge or introduction of the opening take place by die-cutting or by laser cutting.
10. The method according to claim 1 , wherein the toolholder with the moulding screen and the sleeve is cleaned by being sprayed with water.