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The DYNAMIC SHEET FORMER and PRESS from CANPA Instruments are used to produce
one-meter by thirty -centimeter sheets
with properties similar to that of paper made on a commercial paper machine.
Sheets of desired fiber orientation are made by setting the variables to obtain the desired
jet - to - wire ratio.
jet - to - wire ratio.
DSF sheets are used to research into
paper properties, forming fabrics, additives and grade development
paper properties, forming fabrics, additives and grade development - under realistic conditions.
The sheets are made in a centrifuge drum
with a forming fabric spread about it's interior.
Multi-layered sheets can be automatically produced from
any combination of stocks in the three 50-liter on-board tanks.
The ADSF is controlled through the use of the operator console.
The console is divided in two sections with distinctly different functions.
The left side contains a means for
entering the paper making configuration,
as well as manual control of individual functions.
as well as manual control of individual functions.
The right side is dedicated to the control of valves for furnish, fresh water and whitewater
The right side is dedicated to the control of valves for furnish, fresh water and whitewater
collection and delivery.
The parameters which are routinely changed
are contained on the Main menu
These include:
the LAYER and TANK selection,
STOCK volume, stock FLOW-rate,
WIRE speed and DEWATERING-time.
The parameters controlling the paper making process
are entered by using the numeric keypad
beside the fluorescent display.
To change a parameter, simply move the cursor to
the appropriate location
and enter the desired numerical value.
The machine is currently set-up:
to make a ONE-LAYERed sheet using three-and-a-half LITERS of stock
from TANK - 1.
The FLOW-rate will be one liter per minute and the WIRE speed is set-up to
eleven hundred meters per minute. DEWATERING time will be thirty seconds.
The second menu is used to turn
the recirculation pumps on and off.
There are other menus which can be used for more detailed setup of the machine.
Manual controls are used to initiate actions outside of the
automatic paper making cycle.
All manual controls are toggle-type switches, which will remain activated
until pressed again - for deactivation.
The upper buttons control the valves for whitewater, fresh water
and stock introduction,
the lower buttons drain the tanks.
The mixer controls for each tank
are located to the right of the main power switch.
This is a demonstration
of the manual control of the nozzle.
Nozzle movement is initiated by pressing the nozzle button,
and stopped by pressing it again.
Free access to the centrifuge is gained by swinging the nozzle mechanism
completely out of the way.
The complete paper making sequence
on the sheet former
can be achieved
using the manual controls.
As the ADSF is a completely automated machine,
performing the paper making process
using the manual controls is not recommended
Manual controls are primarily to be used
for maintenance activity.
What does it take to make a sheet on the ADSF?
If you are making a single layered sheet,
introduce water into one of the three on-board tanks.
To produce a multi-layered sheet,
you will have to fill the other tanks as well.
The machine will make each layer in sequence
automatically.
Add pulp to the water to obtain the desired consistency,
usually between point one and one percent.
Agitate the furnish with the mixer and recirculate it through the mixing chamber.
Verify that the paper making parameters are set as required and initiate
the process by pressing the START button.
The machine takes over at this point
and the complete sheet making process is fully automatic.
The centrifuge drum will start spinning.
When the drum reaches a certain speed, the nozzle moves to the lower position.
A water-wall will be built
to the pre-selected thickness.
The desired volume of stock
will be delivered at the pre-selected flow-rate.
The nozzle moves up and down,
evenly distributing pulp across the width of the drum.
The operator can observe the proper circulation of stock through the transparent mixing chamber.
Status lights on the control console indicate which parts of the machine
are active at a given time.
Once the pre-selected volume of stock
has been delivered
the nozzle is purged
by fresh water to prevent any plugging.
Then the dewatering mechanism is activated.
Water is removed from the centrifuge at a constant rate
as directed by dewatering parameter which is set in the menu one.
Once the sheet has been de-watered
Once the sheet has been de-watered,
the drum increases its rotation
to compact the sheet
at an elevated speed.
The drum then stops
and the sheet is ready for removal.
Over all, it took five minutes to make
this particular sheet, under these preset conditions.
Other setups of the machine
may be stored in memory as well.
This feature
of the CANPA sheet former
insures repeatable
insures repeatable sheet making conditions.
After the nozzle is brought to the upper position, it is swung out of the way.
To make the next sheet the nozzle will be repositioned in the exact same location
relative to the drum
without the need for adjustment,
due to the positioning device.
The operator then removes the sheet
from the drum, with the forming fabric.
Now we have a formed
sheet on the wire.
Subsequent pressing a drying of the sheet can be done in many ways to
achieve a desired product.
The Canpa Sheet press
is a very convenient and user-friendly device,
specifically designed for pressing the long sheets produced by the ADSF.
The press is easy to use and safe to operate.
The press features include
four selectable
pressing speeds
and two selectable pressing forces.
These can be independently adjusted.
Large working surfaces on each side of the rollers
provide convenient working area
to prepare the sheet for pressing.
The press is bench mounted,
to conserve laboratory space.
This installation uses a drum dryer to dry their sheets.
Other types of dryers are available as well.
Today we made
an eight gramm per square meter
sheet
on the Canpa ADSF.
At the end of the working session
the tanks are drained and the machine
should be thoroughly cleaned.
In this video you have seen the main features of the Canpa automatic
Dynamic Sheet Former and Press.
Many new
design features of the Canpa ADSF result in the production of sheets
of superior uniformity and excellent sheet quality.
The automation of the unit allows one operator to press and dry sheets
while the subsequent ones are being formed,
this greatly increasing productivity.