B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 1/34 (2006.01) B31B 45/00 (2006.01) B32B 27/10 (2006.01) B65B 43/08 (2006.01) B65D 1/40 (2006.01)
Patent
CA 2624040
The invention relates to a method for manufacturing a board tray (7), to a tray blank feasible for the method, and to a tray obtained by the method. The method comprises moulding a blank of plastic-coated board into the tray (7) comprising a bottom (3), side walls (4), as well as a rim flange (5), the blank being compressed in a direction transverse to the tray's side walls and rim flange. According to the invention, the blank is made thinner on its side opposite to the plastic coating such that, during , the moulding process, the plastic coating double-folds at the compressed parts and stabilizes compressions (8) by becoming sealed to itself. Making the blank thinner is most conveniently effected by carving the board layer with a laser beam for having the fiber material predominantly or completely removed from where the cuts are located. As a result of the moulding process, the tray's rim flange (5) develops a smooth plastic surface which enables closing the tray hermetically with a heat-sealed cover.
L~invention concerne un procédé de fabrication d~une barquette en carton (7), une ébauche de barquette convenant au procédé et une barquette ainsi obtenue. Le procédé comprend l~étape consistant à mouler une ébauche de carton recouvert de plastique pour former une barquette (7) comportant un fond (3), des parois latérales (4) et un rebord (5), l~ébauche étant comprimée dans une direction transversale aux parois latérales et au rebord de la barquette. Selon l~invention, l~ébauche est amincie sur son côté opposé au revêtement de plastique de telle sorte que, lors de l~étape de moulage, le revêtement de plastique forme un double pli au niveau des parties comprimées et stabilise des compressions (8) en se soudant sur lui-même. L~ébauche est de préférence amincie en creusant la couche de carton à l~aide d~un faisceau laser de manière à éliminer une grande partie ou la totalité de la matière fibreuse des découpes ainsi pratiquées. A l~issue de l~étape de moulage, le rebord (5) de la barquette présente une surface en plastique lisse permettant de fermer hermétiquement la barquette par un couvercle thermosoudé.
Hovikorpi Jari
Laakso Petri
Maeaettae Paeivi
Tanninen Panu
Vesanto Risto
Ridout & Maybee Llp
Stora Enso Oyj
LandOfFree
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