A bag for containing produce and the like which comprises a central section and two end sections. The end sections they each comprise sections of thermoplastic sheeting, sealed together to provide a pair of facing bag walls defining a bag interior. The central section of the bag comprises at least one plastic mesh sheet. The central section defines a pair of facing, peripherally sealed walls, at least one of the walls comprising the plastic mesh sheet to further define the bag interior.
Bags for produce or the like are prepared by advancing a thermoplastic sheet and a mesh sheet, each having an upper edge, along a process line. The plastic sheet has a bottom portion which is folded to define a lower edge of the thermoplastic sheet at the fold line. One seals the folded portion of the solid-wall thermoplastic sheet to a lower edge of the mesh sheet. Transverse slits are then formed in the sheets, and the sheets are heat sealed together near edges of the slits to form separate bags between the slits. The slits extend across both lower edges of the bags, but are preferably spaced from the upper edges. One drops produce between the sheet upper edges into the bags, and the bags are then heat sealed adjacent to the upper edges thereof, and subsequently separated by cutting. A novel heat seal die is also shown.
A heat seal die assembly for heat sealing plastic sheets, both solid wall and mesh, which comprises the following: first and second heat seal bars forming heat seal lines in said plastic sheets, with the bars being spaced from each other. Each heat seal bar faces a separate backing plate, against which the plastic sheet heat sealing is effected by the heat seal bars. The separate backing plates are respectively carried by a single support plate. The backing plates are connected to the support plate by threaded members which permit adjustable spacing of each backing plate from the support plate, to correspondingly adjust the spacing of each backing plate and heat seal bar during heat sealing operations. Also, optionally, a third, separate backing plate faces a heated cutter, with the third backing plate being adjustably carried in similar manner on the support plate to provide adjustable spacing, and corresponding adjustment of cutting conditions.
A plastic bag for produce and the like, which comprises: a single plastic sheet, folded in one embodiment to define two generally parallel bag walls connected at one end by an integral fold line, and peripherally sealed together. Alternatively, the fold line may be replaced by a seal line between the two sheets. A transverse heat seal is formed between the bag walls in a line generally parallel to the integral fold line, to define a separate bag section having an interior that is separate from the rest of the bag. A line of tearing weakness is defined in the bag and positioned generally parallel to the integral fold line. The line of tearing weakness is positioned between the transverse heat seal and the integral fold line, to permit at least a portion of the separate bag section to be removable from the rest of the bag by tearing, without opening the rest of the bag.
Eugene H. Stys - Washington MI, US Michael J. Recchia - Roselle IL, US
International Classification:
B65D 30/02 B65D 33/04
US Classification:
426410, 383106, 383113
Abstract:
A plastic bag for produce such as potatoes comprises first and second plastic walls peripherally bonded together. A central plastic wall is positioned between the first and second walls, being peripherally bonded to them. The central plastic wall is opaque to substantially block the passage of light therethrough. Thus, potato greening can be avoided while they are stored in the bag even under bright, fluorescent light.
A supplemental label may be attached to a bag having a wire loop closure by the steps of: forming a bag neck of a filled, flexible bag by collapsing bag material about the mouth of the bag. The filled, flexible bag is advanced along a process line to a wire loop closure applying station. An elongated neck of a label is placed against the bag neck, and the wire loop closure is applied tightly around the bag neck and the elongated label neck to close the bag, and to simultaneously attach the label to the bag by wire loop closure attachment. The labels may be fed to the system in strip form. Also, they may be printed after being unwound from a storage roller assembly and before being applied to the bag.
A method is provided for bagging produce in sealed bags in an automated manner. The method comprises the following steps. A pair of thermoplastic sheets are advanced along a process line with the sheets being in parallel, abutting relation. A longitudinal seal line is formed between the sheets near to but spaced from the lower edges thereof to define a bag header. Transverse slits are formed in both of the sheets together, with the edges of the slits being heat sealed, as with a hot knife, to form separate bags between the slits. The slits extend across the lower edges of the sheets, but are spaced from the upper edges. Thus, the sheets remain integral despite the formation of multiple bags therein. Produce is dropped between the thermoplastic sheet upper edges into the bag. The bags then may be horizontally slit to substantially intersect the transverse slits and to separate a horizontal strip of the sheets including the upper edges, while bottom-supporting the bags.
Bags for produce or the like are prepared by advancing a thermoplastic sheet and a mesh sheet, each having an upper edge, along a process line. The plastic sheet has a bottom portion which is folded to define a lower edge of the thermoplastic sheet at a fold line. One seals the folded portion of the solid-wall thermoplastic sheet to a lower edge of the mesh sheet. Transverse slits are then formed in the sheets, and the sheets are heat sealed together near edges of the slits to form separate bags between the slits. The slits extend across both lower edges of the bags, but are preferably spaced from the upper edges. One drops produce between the sheet upper edges into the bags, and the bags are then heat sealed adjacent to the upper edges thereof, and subsequently separated by cutting. A novel heat seal die is also shown.