Method and apparatus for folding and opening-up wipes
Apparatus is provided for manufacturing a wipe in a three-dimensional form out of an essentially flat piece of material. The apparatus produces a blank of essentially flat planar form with a pleat folded on each side. The folded blanks are fed by a conveyor belt to an opening station. The opening station comprises a pair of movable pinch rollers which selectively grab individual blanks from the conveyor belt and feed them via belts to a pair of counter-rotating drums. The blanks are ejected from the drums, which partially opens them up in the process. The partially open blanks are fed onto a shaped former, where the final process of forming the wipe into its chosen three-dimensional form is completed.
1. An apparatus for manufacturing a wipe in a three-dimensional conical form out of an essentially flat piece of material, said apparatus including:
means for folding a continuous web of material to form a folded continuous web of material,
means for cutting a folded blank from the folded continuous web of material and putting at least two creases in the folded blank from opposite sides,
means for folding the folded blank from opposite sides about these creases to create a pleated blank of planar form, and
means for opening out the pleated blank into the three-dimensional conical form,
wherein the means for opening out the pleated blank into the three-dimensional conical form comprises a pair of counter-rotating drums between which the pleated blank is fed to impart an impetus to the blank, and
wherein the pair of counter-rotating drums are perforated with a plurality of holes and are operable to introduce vacuum suction pressure and/or air pressure during the step of opening out the blank.
2. The apparatus as claimed in claim 1 , wherein said means for imparting an impetus to the pleated blank is arranged to do so in the plane of its planar form.
3. The apparatus as claimed in claim 1 , wherein the pleated blank is provided with free, unfolded edges and the impetus that is imparted to the pleated blank is applied with the free edges leading.
4. The apparatus as claimed in claim 1 , wherein the means for opening out the pleated blank further comprises means for selecting individual blanks from a moving line of blanks.
5. The apparatus as claimed in claim 4 , wherein said blank selecting means operates at right angles to the direction of movement of the line of blanks.
6. The apparatus as claimed in claim 4 , wherein said blank selecting means comprises a pair of openable and closable pinch rollers.
7. The apparatus as claimed in claim 1 , further comprising a conically shaped former for setting the blank in the three-dimensional conical form.
8. The apparatus as claimed in claim 7 , further comprising means for deploying vacuum and/or air pressure to assist with holding the blank on the former and/or ejecting the blank from the former.
9. An apparatus for manufacturing a wipe in a three-dimensional conical form out of an essentially flat piece of material, said apparatus including:
means for folding the essentially flat piece of material,
means for cutting a folded blank from the folded essentially flat piece of material,
means for putting at least two creases in the folded blank from opposite sides,
means for folding the folded blank from opposite sides about these creases to create a blank of essentially planar form, and
means for opening out the pleated blank into the three-dimensional conical form.