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Banding |
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Banding is the act of applying multiple wraps of stretch film to a certain area of a load to reinforce and/or unitize a number of layers or products.
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BFR - Conveyor |
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Between Frame Rails: The distance between the (2) outside frames on a conveyor section. Sometimes referred to as effective BFR, which would represent the usable width of the conveying surface.
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Blown Stretch Film |
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A film extruded by the blown (balloon type inflation) system. Typically blown film is a tougher but noisier film than cast films.
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Bottom Wraps |
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The revolutions of film applied by a stretch wrapping system to the lower layers of a pallet or load. Typically more than one revolution is applied to this area to increase the load stability of the unitized load.
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Brake Roller |
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A mechanical roller that provides a resistive force that reduces the film feed rate being supplied to the load. The resulting "drag" will create an increase in tension between the load and the stretch film roll.
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Cast film |
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Molten plastic extruded over full width of a die, then cooled and crystallized over a drum. Cast film typically is quieter, more transparent, and glossier than blown film because of this process.
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Cling (single side - two sided - differential) |
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Cling is a bonding agent added to stretch film to increase the stickiness quality of the film. This is desirable to allow the layers of stretch film applied to bond to the previous layers effectively creating a single wall of stretch film. Depending on the desired effect the bonding agent is applied to one or both sides. It is most commonly applied using co-extrusion where the bonding agent is a layer that is co-extruded during the manufacturing process.
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CRS |
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Cold Rolled Steel.
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Dancer Bar (Dancer Arm) |
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Is a pivoting roller that measures the film feed requirements of the pallet. As the pallet rotates, the stretch film needs to accelerate and decelerate around the corners to maintain a constant film force (or tension) on the load. The dancer bar pivots as the load demands more or less film fed. This is one common method by many manufacturers to measure this film feed requirement.
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EPROM |
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Erasable Programmable Read-Only Memory: An electronic device "chip" that provides a means for storage and communication for a microprocessor program associated with the PLC.
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Film Feed |
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As a film is applied to a load the speed or velocity at which it is applied is called film feed. The feeding of the film is rarely constant as it must be accelerated and decelerated to compensate for the corners of the load to keep the film tension constant. Without this corner compensation feedback the film tension would increase as at the corners causing potential damage or film breakage issues.
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Film Force (Film Tension) |
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Film Force is the retaining force applied by the stretch film on the product being wrapped. This force is typically measured in pounds. Film force is created two ways. The second method is by delaying the film feeding out of the carriage. During wrapping the film is fed out at a constant tension. By delaying the response (speed) of the carriage film feed, you electronically increase the film tension. A film force dial is typically located on the control panel or carriage.
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Film Force Release |
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A feature typically used on automatic stretch wrapping equipment whereby the film force feature is disabled for a time at the beginning and end of the cycle. This feature prevents unwanted tension at the two points during the cycle where added tension would create problems. The stretch film pulling out of the clamp at the beginning of the cycle and the detaching of the trailing tail at the end of the cycle are typically remedied by film force release.
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Film gauge |
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Is the imperial measurement used for measuring film thickness. See the stretch film conversion chart for metric to imperial conversion
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Film Memory |
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Film memory is THE key reason for prestretching stretch film. Prestretching stretch film creates a memory in the film, which causes a continuous elastic effect as the film tries to return to its unstretched self. This ensures that the load integrity is maintained even as the load shifts or settles during transit. It is this film memory that differentiates prestretched film from non-prestretched film or other means of unitizing. For instance, settling that occurs during shipment can loosen other methods of unitizing (strapping) where prestretched film memory takes up the slack and continues to secure the load.
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Film Tail |
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The film tail is the stretch film end piece that is applied to a pallet or load to start a wrapping cycle. It is also the stretch wrap end piece created when cutting the film at the end of the wrapping cycle.
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Hand Wrap |
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Stretch film designed to be post stretched or tensioned stretched by personnel without equipment is called hand wrap. Typically hand wrap does not have the stretching abilities of machine wrap and is wound on smaller and lighter rolls for easier manipulation.
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Home Position |
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Home position is the position of all the moving sub assemblies on a stretch wrapping machine when they are at rest and ready to begin a new cycle.
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Idler Roller |
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Idler rollers are used to bias the stretch film direction as it travels through the prestretch carriage. In some cases it is to ensure that the stretch film is maintained against the prestretch rollers to prevent the film from slipping by the prestretch roller.
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Load Types - A-load, B-Load, C-Load |
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Stretch film and machine manufacturers have divided the types of loads wrapped into three load types based on the degree of difficulty to wrap the load or product.
A-Load: Is the simplest of the load types. Usually a std. pallet with no sharp edges, clean sides without obstructions that may interfere with the application of the stretch film.
B-Load: This load type may have.
C-Load: The most difficult type of load. It may be unstable, with sharp corners that may have an effect on speed
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Load Diagonal |
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Is the measurement of a pallet or product load across the diagonally opposite corners. This dimension is critical in determining the overall size of a stretch wrapper. The difference in this dimension in the largest load to be wrapped and the smallest can also effect how the machine needs to be designed. The equation for determining a load diagonal of any pallet is /(L2 + W2). |
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