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US 5,230,430 AGranted
Sterilizable bag
AssigneeAmycel, LLC
InventorJohn W. Kidder
Life of this patent
Estimating the term…
Abstract
The invention relates to a sterilizable bag including a large transparent, heat-sealable plastic sheet closed by a filter strip comprising a three ply laminate in which a central layer is a microporous plastic, a second layer provides strength and a third layer provides a heat-sealable surface for bonding to the transparent plastic sheet to close and seal the bag.
Claims21
A sterilizable bag, comprising:
- (1) a sheet of transparent, heat-sealable, non-permeable plastic material having side edges folded over to provide adjacent side edges and non-adjacent self-contacting end edges;
- and
- (2) a laminated plastic filter strip in contact with and heat sealed to both of said adjacent edges comprising:
- (a) a central sheet of microporous plastic permeable to gas but impermeable to water,
- (b) an externally facing sheet of permeable plastic, and
- (c) an internally facing sheet of permeable plastic,
- wherein said sheet (a) is bonded to each of (b) and (c) over the entire width of said sheets to provide a permeable laminated strip and at least one of (b) and (c) contacting said transparent sheet is heat sealed to said adjacent side edges, said filter strip being relatively narrow in width compared to its length, said length extending the length of the bag at said adjacent edges;
- and
- wherein one of said self-contacting end edges has been heat sealed to said filter strip, thereby defining an open-ended bag area.
6 more elements
A method of making a mushroom spawn bag which comprises:
- (1) placing mushroom spawn ingredients on a transparent, heat-sealable, non-permeable plastic sheet having on folding adjacent side edges and non-adjacent self-contacting end edges,
- (2) placing a filter strip against the side edge of said transparent plastic sheet before or after folding said transparent sheet,
- said filter strip comprising:
- (a) a central sheet of a microporous plastic sheet permeable to gas and impermeable to water,
- (b) an externally facing sheet of a permeable plastic, and
- (c) an internally facing sheet of permeable plastic, at least one of (b) and (c) contacting said transparent sheet being heat-sealable,
- said filter strip being relatively narrow in width compared to its length, said length extending the length of the side edge of said bag at said adjacent edges;
- and
- (3) heat sealing one of said self-contacting nonadjacent end edges of said transparent plastic sheet and heat sealing the edges of said filter strip to said side edges of said transparent plastic sheet, thereby defining a mushroom spawn bag.
6 more elements
Dependencies are inferred from the claim text.