Disclosed are embodiments of a versatile storage bag and methods of making same. The versatile storage bag may have first and second sidewalls, a double-locking closure mechanism with a first closure element extending along the first sidewall and a second closure element extending along the second sidewall, each closure element having a channel and an elongated member configured for interlocking with one another. A double-seal along three sides of the first sidewall and the second sidewall form a gusset between two seals, leaving an opening through the double-locking closure mechanism. Corner seals may be formed at the corners of the first and second sidewalls, further reinforcing the double-locking closure mechanism for an airtight and hence waterproof seal. The versatile storage bag may be made of a food-grade polyethylene vinyl acetate blend, approximately 90% or less ethylene vinyl acetate and approximately 10% or less polyethylene.

A plastic bag comprising a welded segment at its closure which comprises sealing projections and interlocking projections to form a high integrity seal at the closure edges.

A flexible package having a closure device and a lap or fin seal is provided that reduces or eliminates an air gap present at the fin or lap seal portion of packages. The package can include a film with a closure applied to the film. The flexible package can include a film having a closure device applied to the film transverse to the first and second side edges of the film, with the first side edge portion extending into the fin seal such that at least a portion of the first side edge portion eliminates an air gap between the fin or lap seal and at least one of the first and second side edge portions.

A reclosable pouch that includes a receptacle having a storage chamber and a mouth in communication with the storage chamber, a hermetically sealable closure attached to the mouth, the closure including a first zipper strip and a second zipper strip, the first and second zipper strips being fused together in first and second zones situated at respective ends of the closure, a slider mounted to the closure, and a respective pair of round projections arranged back to back on first and second walls of the receptacle. The round projections are separate and distinct from each other and from zipper terminations of the first and second zippers, and the respective pair of round projections prevents further travel of the slider at opposing ends of the closure upon contact with sidewalls of the slider.

In an apparatus for successively making plastic bags, a laser beam irradiator irradiates laser beam onto webs of panel material and a body of zipper material to heat and melt the webs of panel material and the body of zipper material with the laser beam. The webs of panel material and the body of zipper material are fed intermittently at a speed predetermined to be changed by time. The irradiator is controlled on a feedforward control basis for the laser beam to be regulated in amount, the amount being calculated from the speed predetermined, to obtain a calculated value of amount. The laser beam is regulated in accordance with the calculated value to heat and melt the webs of panel material and the body of zipper material uniformly irrespective of the speed being changed.

Provided is an injection molded element for a slide fastener which retains a high degree of practical strength, which does not cause undulation of a fastener tape after attachment thereto, and which has superior moldability. The present invention is an injection molded element for a slide fastener having as a material a polyamide resin composition containing a polyamide resin having a glass transition temperature from 40 to 70 C., the composition having a melt flow rate from 5 to 40 g/10 min, and containing from 40 to 60 parts by mass of the reinforcing fibers per 100 parts by mass in total of the polyamide resin and reinforcing fibers.

Disclosed are embodiments of a versatile storage bag and methods of making same. The versatile storage bag may have first and second sidewalls, a double-locking closure mechanism with a first closure element extending along the first sidewall and a second closure element extending along the second sidewall, each closure element having a channel and an elongated member configured for interlocking with one another. A double-seal along three sides of the first sidewall and the second sidewall form a gusset between two seals, leaving an opening through the double-locking closure mechanism. Corner seals may be formed at the corners of the first and second sidewalls, further reinforcing the double-locking closure mechanism for an airtight and hence waterproof seal. The versatile storage bag may be made of a food-grade polyethylene vinyl acetate blend, approximately 90% or less ethylene vinyl acetate and approximately 10% or less polyethylene.

A continuous element slide fastener, which includes: a pair of support tapes, arranged in parallel, wherein a gap is formed between the pair of support tapes, each of the support tapes is formed with a first surface and a second surface which are oppositely arranged; and a pair of continuous-type coupling elements, respectively disposed at an inner edge of each of the second surfaces of the pair of support tapes, wherein each of the continuous-type coupling elements is formed with a connection surface and a fastening surface which are oppositely arranged, and the connection surface is formed with a first protrusion; when the slide fastener is in a coupled status, the highest positions of the first protrusions of the pair of continuous-type coupling elements are located in the gap, and the highest positions of the first protrusions are higher than the second surfaces.

A fastener tape includes a first side-edge portion including a core cord and a plurality of first ground warp yarns; and a tape main portion adjacently positioned to the first side-edge portion and including a plurality of second ground warp yarns. A weft yarn and every ground warp yarn of the fastener tape are yarns including plant-derived resin. The first ground warp yarn is FDY (Fully Drawn Yarn) and the second ground warp yarn is DTY (Drawn Textured Yarn) and in accordance with this difference in yarn type, a thermal shrinkage ratio of the first ground warp yarn is greater than a thermal shrinkage ratio of the second ground warp yarn.

A waterproof zipper is provided with two halves, each including a half tape member and a row of protruding teeth along an inner edge of the half tape member; and a waterproof layer is secured to an inner surface of the halves. The waterproof layer coated on the inner surfaces of the halves may prevent the liquid from penetrating into the interior of the waterproof zipper, and simplify the structure of the waterproof zipper. A process of manufacturing the waterproof zipper is also provided.