Woven Polymeric Bag with Pinch-Bottom Seal and Method of Making the Same

A flexible bag formed from a tube of material and having a front side and a rear side, and a pair of opposing, inwardly tending gusset folds, each of said folds having front and rear vertical creases, said bag having at least one sealed closure formed by a method comprising the steps of:

• slitting each of said front creases along longitudinal axes thereof, thereby obtaining front and rear plies;
• forming a first rearward fold by rearwardly folding said rear plies together with said rear vertical creases such that an inner surface of said rear ply is visible;
• and
• forming a second rearward fold by rearwardly folding said first fold wherein said inner surface of said rear ply lays against said rear side of said bag.

A method of sealing a bag, said bag formed from a tube of material and having a front side and a rear side, and a pair of lateral, opposing, inwardly tending gusset folds, each of said folds having front and rear vertical creases, said method comprising the steps of:

• parting said material longitudinally along said front crease;
• rolling a rear ply resulting from said step of parting along with rear portion of said bag proximal to said rear ply such that a surface of said rear ply opposes the rear side of said bag;
• and
• applying an adhesive element to said surface, said adhesive being for the bonding of said surface with said rear side.

A method of sealing a bag, said bag formed from a tube of material and having a front side and a rear side, and a pair of lateral, opposing, inwardly tending gusset folds, each of said folds having front and rear vertical creases, said method comprising the steps of:

• a. treating the surface of said tube of material with a jet of plasma so as to pretreat said surface for sealing;
• b. parting said material longitudinally along said front crease;
• c. folding a rear ply resulting from said step of parting along with the rear portion of said bag proximate to said rear ply such that said pretreated surface of said rear ply opposes the pretreated surface of the rear side of said bag;
• and
• d. applying an adhesive element to said pretreated surface of said rear ply a compressing said rear portion of said bag, said adhesive and said rear ply are joined, said adhesive being effective to bond said rear portion of said bag to said rear side of bag.

A flexible bag comprising:

• a tube comprising polypropylene material pretreated at selective areas with plasma treatment, said tube comprising:
• a front side;
• a rear side;
• a pair of opposing, inwardly tending gusset folds, each of said folds having front and rear vertical creases and each of said folds between said front side and said rear side;
• at least one sealed closure comprising:
• a front ply and a rear ply, said front ply and said rear ply being separated by a pair of slits along said front creases along longitudinal axes thereof, and said rear ply having an outer and inner surface;
• a first rearward fold causing said pretreated area of said polypropylene material to form an outer surface of said rear ply which opposes a pretreated second surface of a first portion of the rear side of the bag;
• and
• a second rearward fold causing a pretreated surface of said inner surface of said rear ply to oppose a second pretreated portion of the rear side of the bag.

A flexible reclosable container comprising a tube of polymer material comprising a front side, a rear side and at least one sealed closure;

• said container comprising:
• selected areas of said polymer material being pretreated with plasma;
• a pair of flexible reclosable fastener profiles;
• a bead of hot melt adhesive applied to selectively treated surfaces of said polymer material and said reclosable fastener profiles, one of which is attached to the front side of the bag on said selected surfaces with said hot melt being disposed between said selectively treated surfaces and said reclosable fastener profile;
• and
• the other of said flexible reclosable fastener profiles being affixed to said rear side of said bag with said hot melt adhesive being disposed between said second reclosable fastener profile and said rear side;
• said fastener profiles each being disposed so as to be selectively interlockable and openable as desired by the user of the bag.

A flexible bag comprising:

• a tube comprising polypropylene material pretreated at selective areas with plasma treatment, said tube comprising:
• a front side;
• a rear side;
• a pair of opposing, inwardly tending gusset folds, each of said folds having front and rear vertical creases and each of said folds between said front side and said rear side;
• at least one sealed closure comprising:
• a front ply and a rear ply, said front ply and said rear ply being separated by a pair of slits along said front creases along longitudinal axes thereof, and said rear ply having an outer and inner surface;
• a first rearward fold causing said pretreated area of said polypropylene material to form an outer surface of said rear ply which opposes a pretreated second surface of a first portion of the rear side of the bag;
• and
• a second rearward fold causing a pretreated surface of said inner surface of said rear ply to oppose a second pretreated portion of the rear side of the bag.

A method of sealing a bag, said method comprising the steps of:

• a. treating the surface of said tube of material with a plasma treatment so as to pretreat said surface for sealing;
• b. parting said material longitudinally along said front crease;
• c. folding a rear ply resulting from said step of parting along with the rear portion of said bag proximate to said rear ply such that said pretreated surface of said rear ply opposes the pretreated surface of the rear side of said bag;
• and
• d. applying an adhesive element to said pretreated surface of said rear ply compressing said rear portion of said bag, said adhesive and said rear ply are joined, said adhesive being effective to bond said rear portion of said bag to said pretreated surface.