Techpap Dynamic Handsheet Former
The uniqueness of the ADF resides in its handsheet formation principle which is completely
different from classic handsheet formers. In fact, the ADF uses a process very similar to
industrial PM sheet production. The sheet is formed by the projection of pulp on a wire
positioned on the ID of a rotating cylindrical jar. The wire is completely submerged in
a water wall. The pulp projection is accomplished using an injector nozzle fixed on a
delivery tube sweeping vertically up and down inside the rotating cylindrical jar. The
final basis weight of the sheet depends on the consistency of the pulp, the number of
nozzle sweeps and the pulp flow. A scoop system bails out the water wall after the sheet
is formed and the water remaining in the sheet is drained by centrifugal force. After the
sheet is drained it can be removed along with the wire from the cylindrical jar for
pressing and drying.
The main advantages include:
The handsheet shape is rectangular.
Sheet lookthrough is excellent.
The fiber orientation is dependent on jet to wire speed ratio (both are adjustable); therefore, it is possible to obtain orientated handsheets.
The retention of fillers, chemicals or dyes is excellent.
The distribution of elements in the sheet thickness is similar to a PM produced sheets.
A large range of fiber types can be used; short or long fibers, synthetic fibers (non hydrophobia), recycled fibers, nonwood fibers, etc.
A large range of basis weight sheets can be made from fine papers to board.
It is easy to make bijet or multi jet sheets with excellent adhesion between the various grades.
Rectangular handsheets can be pressed, dried, calendared, coated or sized, and tested as normal paper.
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Designed to be in exact compliance with ISO Optical Standards, the PROFILE/Plus®
Color Touch® utilizes the same optical design, spectral detectors, and analyzers as
Technidyne’s other spectrophotometers,
Versatility – The PROFILE/Plus® Color Touchv can measure the same sample under
3 different UV sources and calculate color data with 6 color spaces, 10 illuminants and
Configurability - PROFILE/Plus® Color Touch® can be optionally equipped with ERIC 950® technology for measuring recycled content and deinking efficiency.