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Method of manufacturing a food container

  • US 7,507,195 B2
  • Filed: 06/27/2007
  • Issued: 03/24/2009
  • Est. Priority Date: 06/23/2005
  • Status: Expired due to Fees
First Claim
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1. A method of manufacturing a food container or covers, comprising:

  • forming a board of a predetermined size from a material including at least one of pulp or vegetable fiber material other than pulp;

    coating one surface of the paperboard article with thermoplastic resin having a heat sealing property;

    forming substantially V-shaped foldout pieces each for connecting an adjacent pair of sidewall pieces at a respective one of four corners of the paperboard article; and

    forming the food container or cover by hot-pressing the paperboard article between a pair of male and female press dies;

    wherein one pair of the sidewall pieces opposed to each other is configured to be erected ahead of a remaining pair of the sidewall pieces opposed to each other; and

    wherein each of the V-shaped foldout pieces includes a V-shaped foldout portion shorter than other portions of the paperboard article that are adjacent to both sides of the foldout piece, and at least a portion of the V-shaped foldout piece is overlapped or stuck to at least one of an adjacent one side of the V-shaped foldout piece or one of the sidewall pieces.

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