Equipment and method for the forming of paper containers

摘要

The invention concerns the equipment for forming of paper containers starting from a continuous wet paper belt. It comprises a mobile semi-mold and a fixed semi-mold defining an impression corresponding to the container to be produced. Around the mobile semi-mold (15) are provided concentrically an upper cutting blade (18), an upper pleating/crimping ring (19) and an upper rim former (20); around the fixed semi-mold (14) are provided a counter cutting blade (21), an upper counter pleating/crimping ring (22) and a counter rim former (23), associated respectively with the cutting blade, the pleating/crimping ring and rim former on board associated with a mobile semi-mold. And this, respectively, to cut from the initial paper tape a length of paper depending on the measurements of the container to be formed, to pleat/crimp a peripheral crown of said blank paper during the closing stroke of the semi-molds, and to form a crimped rim around the lateral wall of the container during the opening stroke of said semi-molds.

主权项

1. Equipment for forming paper containers in the shape of trays or tubs starting from a strip of wetted paper, where each container has a bottom, a pleated lateral wall and a curled peripheral rim, the equipment comprising:
a fixed semi-mold holder table with a fixed semi-mold; a mobile semi-mold holder table with a semi-mold movable with respect to said fixed table from an open position to a closed position, said mobile semi-mold and said fixed semi-mold forming an impression corresponding to the container to be formed by a drawing process when said mobile semi-mold is in the closed position, wherein an upper cutting blade, an upper pleating/crimping ring and an upper rim former are provided concentrically around said mobile semi-mold, said fixed semi-mold being provided with a counter cutting blade, a counter upper pleating/crimping ring and a counter rim former, respectively associated with said upper cutting blade, said upper pleating/crimping ring and said upper rim former associated with said mobile semi-mold, said upper cutting blade and said counter cutting blade being provided to cut from the paper strip a length of blank paper depending on the dimensions of the container to be formed, said upper pleating/crimping ring and said counter upper pleating/crimping ring being designed to pleat/crimp a peripheral crown of said blank paper during a closing stroke of mobile semi-mold, said upper rim former and said counter rim former being provided to form a crimped rim around the lateral wall of the container during an opening stroke of said mobile semi-mold, wherein said upper cutting blade, said upper pleating/crimping ring and said upper rim former on one side, and correspondingly said counter cutting blade, said counter pleating/crimping ring and said counter rim former are in radial order from the outside to the inside and at different levels.