Method of manufacturing a food container
First Claim
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.
1 Assignment
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Accused Products
Abstract
Method of manufacturing a food container or cover includes the steps of: forming a paperboard article from pulp and/or other vegetable fiber material; coating front surface or back surface of the paperboard article with heat sealable thermoplastic resin; forming foldout pieces for connecting adjacent sidewall pieces at four corners of the paperboard article; and forming the food container or cover by hot-pressing the paperboard article thus obtained between a pair of male and female press dies. One mutually opposed pair of the sidewall pieces is configured to be erected before the other mutually opposed pair of the sidewall pieces. The V-shaped foldout pieces include a V-shaped foldout portion shorter than portions that are adjacent to both side portions on the foldout piece, and the V-shaped foldout piece is overlapped or stuck to an adjacent one side of the foldout piece or sidewall piece.
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Citations
17 Claims
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1. A method of manufacturing a food container or covers, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of manufacturing a food container or cover, comprising:
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providing a paperboard article of a particular shape which when folded defines a plate and sidewalls extending outward therefrom, said paperboard article being comprised of at least one material selected from the group consisting of pulp and vegetable fiber material other than pulp; applying thermoplastic resin having a heat sealing property to the paperboard article on one side thereof; and defining a foldout portion adjoining each of adjacent ones of the sidewalls, said defining including forming a notch in an outer edge of said foldout portion such that at least a portion of said foldout portion is made shorter than both a first structural portion and a second structural portion present on a respective opposite side of the notch such than when said paperboard is folded at a boundary between said notch and each of said first and second structural portions to create an overlap of said first and second structural portions, a portion of said first structural portion which extends into a region defined by the notch is contactable, across the notch, with another portion of said second structural portion which extends into the region defined by the notch. - View Dependent Claims (17)
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Specification