Minigrip LLC

Karl-Heinz Siegel

A closure device, preferably made of plastic, serves for closing bags. It consists of a male section (1) and a female (2, 5 and 6), which are respectively joined to film (3 and 4) and may be detachably connected together. In order to ensure that such a closure device may be readily closed while at the same time being simple and cheap to produce, at least two spaced continuous projections (8) are provided on the side of the film (3) opposite to the male section (1). Similar projections (9) may advantageously be placed on the opposite side of the female section.

Closure device for bags and a method and a tool for producing same

A fastener structure having continuous interlocking flexible plastic profiles on opposing strips adapted to be releasably interlocked to each other, each strip having a pair of ribs and a pair of grooves wherein each rib and each groove of the pairs are of the same size and shape, a blocking boss extending continuously along the outermost of the ribs to engage a rib of the other strip when the strips are misaligned and the wrong rib is pressed into the wrong groove but allowing interlocking when both ribs and grooves are aligned.

Plastic interlocking fastener strips

A pilfer proof hangup bag structure having a bag top separable closure including fastener strips carrying extruded plastic profiles from which pull flanges extend upwardly. One of the pull flanges has an upward hangup header extension. A pilfer proof tongue of thin folded film web is attached in closing relation to the top from the bag attachment to ribs at the top of the pull flanges. Adjacent to the ribs the tongue has fracture lines to facilitate rupturing and removal of the tongue when access into the bag is desired.

Pilfer proof hangup bag structure and method

Method of and apparatus for producing plastic bags having separable plastic fasteners. A strip of bag making material is advanced step-by-step by bag width sections into a tear sealing station where the strip is retained for a dwell interval. In the station, the separable fastener means of the bag material is subjected to ultrasonic tear sealing as by means of a sonotrode along a bag edge defining line extending across the strip. Also in such station, the thinner bag body material is heat tear sealed along the bag side edge defining line as by means of a heat bar coordinated in operation with the ultrasonic sealing. The sonotrode has a profile comprising a tear line edge and material controlling and sealing rib means spaced from the tear line sealing edge.

Method of and means for producing plastic bags having separable plastic

A hang-up container made from thermoplastic synthetic material has a bag or sack body attached to a separable fastener comprising extruded pressure- slide- or push-fastener strips one of which has an upwardly extending reinforced carrying portion which may be provided with a reinforcing bead therealong at juncture with its closure portion and which has attached thereto an upwardly extending hook/handle. Bag type containers as thus described are especially adapted to be produced in an automatic production machine wherein body film material and the fastener strips are brought together and integrally welded, the prefabricated hook/handles are welded onto the carrying portions, the bags are successively separated along tear seals, and the separated bags carried away from the machine. The hook/handle part may be provided with a handhole and an upwardly projecting hanger hook, or with a handhole into which a hanger bar entry slot extends at one side with a central hanger bar recess notch opening downwardly in the handle into the handhole.

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Nuremberg, Germany

Karl-Heinz Siegel