公开(公告)号：CA2624040A1

公开(公告)日：2007-04-05

申请号：CA2624040

申请日：2006-09-28

Applicant: STORA ENSO OYJ

Inventor： VESANTO RISTO ,  MAEAETTAE PAEIVI ,  TANNINEN PANU ,  HOVIKORPI JARI ,  LAAKSO PETRI

IPC: B65D1/34 ,  B29C43/20 ,  B31B45/00 ,  B31B50/59 ,  B32B27/10 ,  B65B43/08 ,  B65D20060101 ,  B65D1/40

Abstract: 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.

公开(公告)号：FI20050975A

公开(公告)日：2007-03-30

申请号：FI20050975

申请日：2005-09-29

Applicant: STORA ENSO OYJ

Inventor： MAEAETTAE PAEIVI ,  VESANTO RISTO ,  TANNINEN PANU ,  LAAKSO PETRI ,  HOVIKORPI JARI

IPC: B65D20060101 ,  B29C43/20 ,  B31B45/00 ,  B31B50/59 ,  B65D1/34 ,  B65D1/40

Abstract: A board tray, a method for manufacturing a board tray and a tray blank from which the board tray is manufactured, said board tray containing side walls and a bottom wall made of a board layer provided on at least one surface thereof with a plastic coating, wherein areas of reduced thickness are formed in the board layer whereby portions of the plastic layer which have been melted and are disposed adjacent to areas of reduced thickness are compressed into such areas forming double-folded linear plastic compressions which seal on themselves.

公开(公告)号：CA2557506A1

公开(公告)日：2005-09-01

申请号：CA2557506

申请日：2005-02-24

Applicant: STORA ENSO OYJ

Inventor： HOVIKORPI JARI ,  LAAKSO PETRI ,  MAEAETTAE PAEVI ,  VESANTO RISTO

IPC: B31B50/64 ,  B65B51/22 ,  B23K26/18 ,  B29C65/16 ,  B31B20060101 ,  B31B50/66

Abstract: The invention relates to a method for sealing a fiber-based material (1, 4) to a counter-surface to be bonded to it by melting polymer present at the sealing point. In accordance with the invention, the sealing is performed by directing a laser beam (8) through the fiber layer (4) of the material to a radiation-absorbing pigment disposed in the sealing area (9), with the absorption heat melting the polymer (5) and generating the sealing. The method allows sealing of plastic-coated paper or board to itself, to another plastic counter-surface or also to paper or board without any plastic coating. It is also possible to seal uncoated paper or board to paper or board containing plastic, such as plastic-coated paper or board, or to a plastic film. The absorptive pigment, e.g. carbon black, may be admixed in the plastic coating of the board or paper or the plastic film formed on the counter-surface, or the pigment may be located on the surface of the material to be sealed or its fiber layer, or on the counter-surface to which the material is sealed, e.g. as a component of printing ink applied to the counter-surface.