Abstract:
A slider-operated fastener comprises first and second opposing tracks including respective first and second interlocking profiles and respective first and second fins extending downward from the respective first and second profiles. The first and second fins are sealed to each other by a plurality of spaced preseals. After generating each preseal, a notch is formed in the profiles and upper portions of the fins at the generated preseal. To install a slider onto the fastener, the slider is initially positioned within the respective notch and then threaded onto the fastener in response to relative movement of the slider and the fastener. Either before or after the steps of forming each preseal and respective notch and installing the respective slider, the fastener is attached to a moving web of plastic film. The fastener-carrying web is later folded and sealed to form individual plastic bags. The preseals are advantageous in that they allow the fastener to be controlled during such downstream operations as notch formation and slider installation and when the fastener is tensioned by various rollers in the bag making machine. The preseals keep the interlocked profiles together and prevent them from moving longitudinally relative to each other. In addition, the preseals generally encompass the respective notches to assist in providing a leakproof barrier to entry into an interior of the fastener between the fins via the notches. This leakproof barrier is effective in the ultimately formed plastic bags.
Abstract:
A method for manufacturing a zipper includes the step of dividing a label into two halves. The two halves are disposed on a cloth strip. Two banks of continuous chain teeth are pressed against one another and then are sewn to the cloth strip. The width between the sewing portion of two banks is equal to the distance between the two halves of the label. A wedge block expands the two banks of chain teeth outwards, so that a space is formed. The cloth strip is melted and cut, so that the cloth strip is cut adjacent to the two chain teeth. A strip separation wheel feeds out the left and right portions of the cloth strip, sewn with the chain teeth, at the same time. Fittings, such as a chain clip, are attached to the chain teeth to finish the zipper.
Abstract:
A method for forming ends of a slide fastener chain wherein, coil-shaped fastener elements such as linear fastener elements are attached and sewed to side edge portions of a pair of fastener tapes with sewing yarns as fixing yarns while a core thread is inserted through the fastener elements. The coil-shaped fastener elements are cut off at leg portions, each of which is in contact with the fastener tape, at ends of the fastener elements, so that cut end portions are formed. These cut end portions are pushed inward of the side edge portions, and then, the leg portions and inverted portions thereof are fused to the fastener tapes by heating. As a result, each end of the fastener elements is stabilized, so that the resultant slide fastener is safe.
Abstract:
An assembly and method for installing sliders and end terminations onto a reclosable zipper for plastic bags is disclosed. The assembly includes a base with a cam path. A rotor is mounted on the base and includes at least one slider installing member and at least one end termination installing member. The rotor includes a cam follower extending into the cam path and secured to one of the slider installing member and end termination installing member which is reciprocally mounted on the rotor and is reciprocated by the interaction of the cam path and cam follower. At a first point in the rotation of the rotor the slider installing member and the termination installing member are supplied with sliders and terminations. At a second point in the rotation of the rotor the slider and terminations are simultaneously installed onto a zipper.
Abstract:
In a pull-assembling unit for automatically assembling a pull onto a slider body of a slide fastener, a slider transporting means includes a slider-body-transportation plate member having rectangular notch portions spaced at intervals of plural assembling sections along a top end edge thereof, each for accommodating the slider body. The slider-body-transportation plate member is adapted to be actuated in the slider-transportation path so as to draw a rectangular trajectory in a vertical plane. An actuation upper limit position of a top end of the rectangular notch portion is set to be above a slider-body-placing surface of the slider-transportation path and an actuation lower limit position of the top end of the notch portion is set to be at a retreat position below the slider-body-placing surface. Therefore, the slider-pull-assembling unit has a simple structure and is capable of assembling a pull onto a slider body accurately and securely at a high speed.
Abstract:
Several embodiments of resilient slider members and methods of assembling such slider members onto interlocking fastening strips are disclosed herein. The slider member (200) comprises a pair of spaced-apart side walls (210, 230) and an intermediate body portion (250) therebetween. In addition, each side wall includes an interior surface (215) with an inwardly projecting shoulder (216) formed thereon, an exterior surface (217), and opposed end surfaces (218). The method of assembling a slider member (200) onto interlocking fastening strips (110) includes the acts of: engaging respective side walls (210, 230) of a slider member with first and second tools (260, 270); moving the first tool (260) away from the second tool (270) to resiliently spread apart the side walls (210, 230) of the slider member; inserting interlocking fastening strips (110) between the spread apart side walls (210, 230) of the slider member; and releasing the first and second tools (260, 270) from engagement with the side walls (210, 230) of the slider member to permit the side walls (210, 230) to resiliently return to a relaxed position wherein the shoulders (216, 236) formed on the interior surfaces of the side walls (210, 230) are positioned to obstruct removal of the slider member (200) from the interlocking fastening strips (110).
Abstract:
A metal mold for molding a slider of a slide fastener is provided. The metal mold comprises upper and lower mold cavities for molding portions of the slider, with the upper and lower molds moving up and down relative to each other in order to open and close the mold. The mold further comprises at least two sliding molds for molding portions of the slider not molded by the upper and lower molds. The sliding molds are capable of being removably introduced into the upper and lower molds from their front and rear sides when the upper and lower molds are in tight contact with each other.
Abstract:
Methods for mounting a slider device on a recloseable package include mounting the slider device by expanding the leg construction of the slider device with an expanding track to allow mounting of the slider on a recloseable zipper construction. A particular method includes providing a slider device to a slider positioner, such as a carousel, moving the slider along an expanding track, and mounting the expanded slider device onto the recloseable mechanism at the end of the track.