Draw tape bag

摘要

The plastic bag with a hem and draw tape may include flexible thermoplastic sidewalls that have a network pattern imparted onto them across the side seams. In one embodiment, the network pattern is below the hem seal. In another embodiment, the network pattern covers the hem seal. The bag may also include a ribbed pattern below the network pattern. The network pattern may be continuous or discontinuous.

主权项

1. A thermoplastic bag comprising:
a first sidewall of flexible thermoplastic material; a second sidewall of flexible thermoplastic material overlaying and joined to the first sidewall to form a first sidewall seam along a first side edge, to form a second sidewall seam along an opposite second side edge, and a closed bottom edge, the first and second sidewalls un-joined along respective top edges to define an opening opposite the bottom edge for accessing the interior volume and creating a sidewall interior surface in the interior volume and a sidewall exterior surface opposite the sidewall interior surface; the first and second sidewalls forming a hem having a top length and extending along the open top end disposed opposite the bottom edge, the hem having a bottom length and a hem seal, the hem including one or more draw tape notches and a draw tape within the hem; wherein the thermoplastic material of the first and second sidewalls is oriented such that the orientation of the thermoplastic material from the first side edge to the second side edge is machine direction, or MD, orientation and the orientation of the thermoplastic material from the closed bottom edge to the opening is transverse direction, or TD, orientation; wherein the first and second sidewalls include a first portion with a discontinuous network pattern extending linearly between the first side edge and the second side edge and wherein the first portion with the discontinuous network pattern extends from above the bottom edge to below the hem seal such that there is a top un-patterned portion below the hem seal such that the bag shows an elastic characteristic in the first portion with a discontinuous network pattern; wherein the bag comprises a second portion below the first portion, the second portion with a pattern of adjacent, linear ribs extending linearly between the first side edge and the second side edge, the ribs being substantially parallel and being formed with substantially equal indentations from the sidewall interior surface and the sidewall exterior surface such that the second portion is not elastic and shows decreased average thickness and increased TD tensile energy to yield at a constant or decreased tensile yield compared to the un-patterned portion.