An apparatus for the perforation of tracks of goods which are transportable approximately in their plane, particularly of thermoplastic synthetic material foils, with at least one sleeve-shaped punching tool which is moveable back and forth relative to the track of goods perpendicularly to the plane of transportation and parallel to its longitudinal axis, with a coaxially arranged pin which engages in the hollow punching tool for discarding the stamping cuttings, with a carrier of the track of g...

Various arrangements are disclosed for perforation by laser of cigarettes carried on a fluted drum without rolling. In one arrangement (FIGS. 1-3) rings of reflectors (8, 14) movable with the drum (12) intercept and direct a continuous laser beam (18). In another arrangement (FIGS. 4,5) cigarettes (28) are perforated while being conveyed past a fixed focus pulsed beam (32) which has a selected profile and is redirected between passing cigarettes to perforate cigarette at other positions. Other a...

A web is electrically perforated at high hole density by applying alternating-current voltage across an electrode pair facing the web while pressurized gas is supplied to the electrode gap. Voltage amplitude level and gas flow and direction thereof are selected to provide for the striking of multiple arcs per half-cycle, thereby enabling reduction in spacing between adjacent perforations in the web. Perforation practice involving preselection of cigarette filter tipping paper based on chemical c...

Methods and apparatus for fracturing a subterranean formation which use a fracturing tool. The fracturing tool includes a hydrajet tool, with at least one fluid jet and at least one fracturing port extending through the liner. The fracturing tool further includes a rotating sleeve with at least one interior fracturing port and at least one interior fluid jet port. Finally, the fracturing tool may include a power unit capable of changing the orientation of the rotating sleeve. During fracturing o...

A perforating blade for creating extremely fine perforations in plural plies of a multiply ply paper construction including a perforating edge defined by a plurality of perforating elements separated by notches. Preferably there are about 50 or more of each of the elements and the notches per lineal inch with the notches having a length along the cutting edge of no more than about 0.010 inches. A relatively small number of the perforating elements, at generally uniformly spaced locations along t...

An improved apparatus for releasing a perforation gun from a tubing string in a well casing is disclosed. The explosion of a detonator that fires the perforation gun opens a previously sealed passageway through a wall of the apparatus of the invention. The passageway transmits bottom hole well pressure to a piston that actuates means for releasing the perforation gun. A secondary release sleeve is also provided to mechanically release the perforation gun when the piston fails to function properl...

A perforation apparatus is coupled to a tubing string and is eccentrically positioned in a casing in a well bore by eccentering devices so that annular sealing rings along the length of the apparatus sealingly engage the casing. Shaped charge devices are arranged in pairs so that a pair of shaped charges produces, when detonated, a horizontal and an inclined perforation which intersect in the earth formations behind the casing. One of the perforations extends through a sealing ring to the interi...

A measuring plate (10) supports successive rows of perforation fingers (24i-k) on its upper side, the spacing and diameter of which respectively correspond to the perforations of a postage stamp. By laying .the postage stamp on a row of perforation fingers (22i), the conformity of the postage stamp perforations and measuring perforations can be checked in a tactile manner. The measuring plate (10) is connected by way of a hinge (30 to 34) to a trough-like lid member (12), which can be used for c...

A device for perforating a film web while wrapping a load which the film web includes a web dispenser for dispensing the film web and an arrangement for providing relative rotation between the load and the web dispenser to wrap the film web on the load. It also includes electrodes positioned proximate to the film web and an arrangement for generating an arc at the electrodes to perforate the film web with the arc.

The invention relates to a well perforation device comprising a support (25) and encapsulated shaped charges (26) fixed unidirectionally on this support, usually on the back side of a support bar whose front side is to be applied against the casing. Positioning rings (35, 36) are snapped onto the charges (26) at regular intervals along the support (25). These rings have a rounded external surface on which the perforation device can swivel up to a correct balanced position for which the front sid...