Cleaning alone will not guarantee the integrity of tapes; it must be
coupled with precision winding. Long lengths of thin tape (i.e. 9200 feet x .001
inches and thinner) are susceptible to damage during shipping and handling. The
Department of Defense devised a specification for conditioning tape prior to
handling in order to preserve good physical characteristics. This specification,
covers several aspects of winding including a precision stack and a stable
A precision stack leaves no protruding edges (scatter wind). It centers
the tape between the guiding flanges thereby keeping the tape from rubbing
against the flanges and wearing or curling the edge of the tape. Degaussing
(erasure) and handling can also damage the edges of a non-precision stack. A
scattered wind can contribute to skew on the tape recorder. This is why cleaning
and precision winding is so important before use, degaussing, storage, or
A tight pack inhibits lateral shifting that can occur from shock or
vibration because trapped air has been removed to improve layer-to-layer
friction. A stable conditioned pack inhibits longitudinal shifting which can
occur from changes in temperature and humidity.
Normal winding, that is winding with constant tension or constant torque,
is insufficient for conditioning because it produces areas of negative tension
in the tape pack resulting in poor layer-to-layer friction. This can cause
microscopic shifting which degrades tape performance. If allowed to advance, it
will cause cinching and permanent damage to the tape.
Contaminants and poor winding cause considerable damage to expensive magnetic
tape. BOW Industries protects your investment by eliminating these problems.
CLEANING AND BURNISHING
The BOW sapphire blade provides superior removal of embedded dirt
particles and smoothes abrasive oxide surfaces of new tapes. This very hard
gemstone blade has a long life and is resistant to nicking and wear grooves from
The BOW tissue stations are positioned upstream of the blade
to remove loose dirt, and downstream to remove dirt loosened by the blade.
Designed for maximum efficiency, the tissue stations maintain a firm contact
point with an optimum radius. The tissues are made of special non-shedding long
filament nylon fabric that is automatically advanced, allowing clean tissue to
always contact the tape.
PRECISION STACKING (Reel to Reel Tape Only)
The BOW packwheel permits precision guiding of one layer on top of the
preceding layer. To be effective this wheel has a firm support, a large diameter
(over 6"), 180 degrees of tape wrap around it, and engages a reel that is
also firmly supported.
The packwheel's "air squeegee" affect prevents the air from
affecting the wind so there is good layer-to-layer friction to prevent shifting
in the pack; this is necessary to prevent a scattered wind.
The BOW hubs insure precision locating. The hub holds the reel firmly for
precision stacking and insures parallel positioning with the tape deck. The hub
also has a positive locking feature that gives an over-center single movement
action and an automatic adjustment for variations in reel-hub thickness and
ACTIVE GUIDING (DIGITAL CASSETTES ONLY)
Active guiding has been the subject of many discussion and experiments. It
has long been recognized that flanged guides if not properly aligned will cause
significant edge damage. Further, poor tape stack quality has been traditionally
solved by the use of a packwheel that removes air between layers of tape to
provide a "precision" stack of the tape. Use of a packwheel is not
possible with digital cassettes. BOW Industries’ "active guiding"
system will provide a uniform tape stack by simply sensing where the tape is
coming out of the cassette shell and making minor corrections to guide the tape
through the tape path and onto the other reel.
Using empirical data derived from research, the government developed a
programmed tension winding system that protects against longitudinal pack
shifting aggravated by shock, vibration, temperature, and humidity changes.
Systems developed by BOW Industries conform to this profile.
Virtually every major tape rehabilitation center uses a programmed-tension
winding system on instrumentation tape prior to returning the tape to service.
It is the only known method of meeting government defined temperature/humidity
cycle requirements for 1/2 and 1 inch instrumentation tape.
The benefits of tape maintenance are dramatic when demonstrated through
magnetic certification of the media performance. Flexibility is the key to BOW's
testing systems that duplicate the recording systems demands on the tape and
provide meaningful dropout information.
BOW Industries' system for cleaning, precision stacking, and
programmed-tension winding is essential for eliminating costly dropouts and
promoting safe archival storage.
To see how BOW can save you time and money call (703)361-7704 to talk with one of our
representatives. He will gladly write an analysis of your company's needs and
how BOW Industries can fill them.