A system for monitoring the percentage of stretch of a stretch wrap film in a stretch wrapping machine includes a first sensor associated with the stretch wrap roll and configured to generate a first signal as the film travels from the roll to the pre-stretch roller assembly, and a second sensor associated with the load and configured to generate a second signal as the film is wrapped around the load. A processor is operable to: a) calculate a pre-stretch length of the film based on the first signal during a time interval; b) calculate a stretched length of the film as the film is wrapped around the load on the rotating platform during the time interval; and c) calculate a percentage stretch of the film based on the pre-stretch length and said stretched length.

There is provided a method for wrapping a load comprising an upper portion defining an upper peripheral surface and a lower portion defining a lower peripheral surface. The method includes configuring a first material dispenser including a first material web in a first starting position and a second material dispenser including a second material web in a second starting position. The method includes and providing a rotation between the load and the material dispensers, such that, upon the rotation, the first material dispenser wraps the upper peripheral surface of the load with the first material web and the second material dispenser wraps the lower peripheral surface of the load with the second material web. The first material dispenser wraps the upper peripheral surface of the load simultaneously while the second material dispenser wraps the lower peripheral surface of the load during at least a portion of a wrapping cycle.

Dual and multi-modulator projector display systems and techniques are disclosed. In one embodiment, a projector display system comprises a light source; a controller, a first modulator, receiving light from the light source and rendering a halftone image of said the input image; a blurring optical system that blurs said halftone image with a Point Spread Function (PSF); and a second modulator receiving the blurred halftone image and rendering a pulse width modulated image which may be projected to form the desired screen image. Systems and techniques for forming a binary halftone image from input image, correcting for misalignment between the first and second modulators and calibrating the projector systeme.g. over timefor continuous image improvement are also disclosed.

Control of a load wrapping apparatus may be based at least in part on the relative stability of a load, such as based upon one or more load stability types that categorize the relative stability of the load. A graphical depiction of a wrap profile may also be used in some instances to facilitate operator set up of the wrap profile.

A machine for packaging flexible hoses in a plastic film has a packaging station provided with an operating device for imparting to a coil of flexible hose a rotary motion around a rotation axis, and an orienting device for imparting to the plastic film an oscillatory motion around a fulcrum axis substantially transverse to the rotation axis of the coil.

A method, apparatus and program product may determine load stability for a load to be wrapped based upon sensing the response or reaction of the load to a disturbance applied to the load, e.g., through intentionally moving, shaking, tilting, pushing, impacting or otherwise applying an input force to the load and sensing the response using one or more sensors. The sensed response may then be used to determine a load stability parameter that may be used in the control of a load wrapping apparatus when wrapping the load.

A method for securing a palletized load is provided. The method comprises dispensing a first stretch film vertically inserted over a first support member, dispensing a second stretch film having an upper lateral side edge and a lower lateral side edge and being vertically inserted over a second support member, edging at least one of the upper lateral side edge and the lower lateral side edge of the second stretch film to obtain an edged second stretch film, partially overlapping the edged second stretch film and the first stretch film, passing the combined stretch film through a pre-stretcher, and wrapping the combined stretch film around the palletized load. The height of the stretch film can be adjusted using a height adjustment device. A third stretch film can be dispensed and combined with the first and second stretch films.

Control of a load wrapping apparatus may be based at least in part on packaging material grading and/or factory profiles.

A containment force apparatus and method a containment force apparatus for measuring containment force on a load, the apparatus comprising a first element configured to contact the load; a second element configured to engage at least a portion of a packaging material on the load and move between a first position associated with the first element to a second position perpendicular to the first position and spaced from the first element a measured distance; an actuator configured to urge the second element to move between the first position and the second position; and a force sensor configured to measure a force exerted on one of the first element or the second element.

A method, apparatus and program product control a dispense rate of a packaging material dispenser of a stretch wrapping apparatus by utilizing a combination of a sensed rate of packaging material exiting the dispenser and a predicted geometric relationship between the packaging material dispenser and the load.