INTEGRAL EXTRUDED CONSTRUCTION FOR BAGS AND METHOD OF MAKING SAME

摘要

In several embodiments of the invention a plastic extruded bag construction comprises a unitary one piece plastic extrusion including a thin wall plastic closure web area which may serve as a gusset normally extending into the bag and adapted to be projected from the mouth of the bag as a pouring spout. Pull flange portions of substantial length all in one piece in the extrusion together with the closure web have proximal ends joined respectively to opposite sides of the closure web area. Separable resiliently flexible interlocking complementary fastener profiles integral in one piece in the extrusion with the closure web area and the pull flange portions adjacent to the proximal ends of the pull flange portions are arranged to be interlockingly separably coupled together and separated by manipulation of the pull flange portions and flexing of the closure web area. A bag body has side wall panels with end parts thereof joined to the extrusion adjacent to the profiles whereby the closure web provides a closure for the bag inwardly from the fastener profiles and which closure must be ruptured to gain access into the bag. Corresponding embodiments of the method of making the plastic extruded bag construction have been disclosed. The side wall panels for the bags may be extruded integrally with the closure web area, the flange portions, and the fastener profiles, or the side wall panels may be separately formed and sealed to the collapsibly folded closure web area or the flange portions adjacent to the profiles. The profiles may be extrusion molded on the pull flange portions or may be extrusion molded on the closure web area closely adjacent to the pull flange portions or may, in effect, be extrusion molded to the pull flange portions and the closure web area where they join together. Especially where the profiles are on the pull flange portions, the profiles may be efficiently cooled from both sides of the respective flange portions following the extrusion. The collapsibly folded closure web area may be formed into a funnel spout element for each bag or may serve simply as a hermetic seal until it is desired to open the associated bag which has been formed by hermetically sealing as necessary along edges of the side wall panels.