1. Venpap System for Paper Machine
PRESS FELT CLEANING AND CONDITIONING
Sunday, April 16, 2017

2. What is the Importance of Press NIPs?
Mechanical Dewatering is 10 Times Cheaper than Thermal Drying
Without a specific vacuum system designed to remove all of the shower water
and appropriate felt conditioning,  definite press  inefficiencies can occur.

4. Sunday, April 16, 2017

5. The VenPap phenomenon is illustrated in this animation.
A Venpap Blow Box blowing a mixture of hot air and steam is fixed above the vacuum box.
Here, we subject felt to extreme conditioning along with its preheating.
At the same time better permeability is accomplished and felt impurities are loosened.
From there on, past the VenPap zone, a washed, dewatered and well prepared to absorb water felt runs to the press process.
Vcuum
Sunday, April 16, 2017

6. Animation beside illustrates a running Blow Box within the VenPap System. Air-steam mixture blown through the vacuum slot automatically penetrates the inside structure of felt. Blow Box preheats felt while thoroughly conditioning it.
The diagram illustrates a typical steam box. A stream of pure steam flows through the slots that can be seen in the chart. The steam box operates just above the paper sheet and treats paper with hot steam in the widest possible range. The device’s main function is to pre-heat paper.
A Steam box virtually does not impact the felt and does not affect its conditioning.

7. VenPap
Install
VenPap
Exemplary balance of steam: Use for VenPap System = lb /h
( one felt conditioning) Saving in the dryer = lb/h
Net Saving = lb/h
Sunday, April 16, 2017

8. A major problem for contemporary, high-speed paper machines is the variable condition of the felt. After several days of work felts are characterized by varying permeability profile. Scanning felts in the cross direction to its movement shows in which sections the felts are inadequately prepared for the pressing process.
The above diagram shows the control window for Venpap Blow Box operation. The PM’s operator sees the graph profile of water permeability of the felt. To regulate and improve the conditioning of weaker sections move Blow-Box sliders controllers under the graph. More at
Sunday, April 16, 2017

9. Change of the steam consumption for PM 220,000 t/year
Sunday, April 16, 2017

10. Sunday, April 16, 2017

11. VenPap Procedures for Press Section
STEP 1 – Check parameters of the felts:
moisture, permeability, temperature STEP 2 - VenPap Project for a specific Press STEP 3 - Supply of equipment, running and adjustment
STEP 4 – Measurements of the paper
dryness, overview of results