Guidebook
Raw material
Manufacturing
Converting
Sanding methods
Sanding faults: causes and actions
Product recommendation
1. Raw material 1.1 Principles of the construction of coated abrasives1. Raw material
1.2. Backing material
1.2.1. Paper
1. Raw material
1.2. Backing material
1.2.2. Cloth 1. Raw material
1.3. 1st binder
1.3.1. Animal glue
1. Raw material
1.3. 1st binder
1.3.2. Synthetic resin
1. Raw material
1.4. Grains
1.4.1. Aluminium oxide
1. Raw material
1.4. Grains
1.4.2. Silicon carbide
1. Raw material
1.4. Grains
1.4.3. Grit sizes
1. Raw material
1.4. Grains
1.4.4. Grit sizes
1. Raw material
1. Raw material
1.5. 2nd binder
1.5.1. Synthetic resin
1. Raw material
1.6. Sanding active fillers
1.6.1. Antistatic abrasives
1. Raw material
1.6. Sanding active fillers
1.6.2. Stearated abrasives
Raw material
Manufacturing
Converting
Sanding methods
Sanding faults: causes and actions
Product recommendation
2. The manufacturing process
2. The manufacturing process 2.1. Raw material of paper or cloth
Raw material
Manufacturing
Converting
Sanding methods
Sanding faults: causes and actions
Product recommendation
3. Converting 3.1. Slitting of rolls
3. Converting 3.2. Cutting of material for endless belts
3. Converting 3.3. Joint skiving
3. Converting 3.4. Joint pressing
Raw material
Manufacturing
Converting
Sanding methods
Sanding faults: causes and actions
Product recommendation
4 Sanding methods
4. Sanding methods 4.1. Calibration 4.1.1. Description and recommendations
Calibrate to the right thickness.
Chatter marks from planer, if any, are removed.
Sanding machines equipped with sanding pads are not suitable for calibration.
The efficiency of the stock removal is effected by the diameter and the hardness of the rollers.
4. Sanding methods 4.1. Calibration 4.1.2. Stock removal recommendations
4. Sanding methods 4.2. Cross sanding 4.2.1. Description and recommendations
Cross sanding minimizes the fibre to rise.
Cross sanding facilitates remove veneer tape, glue and filler.
Reduced sanding costs since the cross belt prolongs the life time of the wide belts.
Cross sanding gives a plain surface to the softer and harder parts of the working piece.
4. Sanding methods 4.2. Cross sanding 4.2.2. Stock removal recommendations
4. Sanding methods 4.3. Surface sanding 4.3.1. Description and recommendations
The required surface must be achieved without large stock removal.
The conveyor belt should have a hardness of approx. 40-50 durometers.
4. Sanding methods 4.3. Surface sanding 4.3.2. Stock removal recommendations
4. Sanding methods 4.4. Lacquer sanding 4.4.1. Description and recommendations
Normally a product with grains of silicon carbide is used.
Use as low sanding pressure as possible to reduce friction.
The lacquer must be well cured. When sanding hard lacquers a product with grains of aluminium oxide is recommended.
4. Sanding methods 4.4. Lacquer sanding 4.4.2. Recommendations
4. Sanding methods 4.4. Grit combinationRaw material
Manufacturing
Converting
Surface sanding
Sanding faults: causes and actions
Product recommendations
5. Sanding faults: causes and actions 5.1. Chatter marks
Description
Transverse sanding faults on the work piece
5. Sanding faults: causes and actions 5.1.a. Chatter marks
5. Sanding faults: causes and actions 5.1.b. Chatter marks
5. Sanding faults: causes and actions 5.2. Blank lines
Description
Longitudinal, oscillating blank lines, no ridges
5. Sanding faults: causes and actions 5.2.a. Blank lines
5. Sanding faults: causes and actions 5.3. Blank lines
Description
Longitudinal, oscillating short narrow
blank lines, no ridges
5. Sanding faults: causes and actions 5.3.a. Blank lines
5. Sanding faults: causes and actions 5.4. Unbroken ridges
Description Longitudinal, unbroken and narrow oscillating ridges
5. Sanding faults: causes and actions 5.4.a. Unbroken ridges
5. Sanding faults: causes and actions 5.5. Broken ridges
Description
Longitudinal, short and narrow oscillating ridges. Sometimes only following the oscillation in one direction. See the picture
5. Sanding faults: causes and actions 5.5.a. Broken ridges
Causes
1. Too big removal because of to high sanding pressure
2. Too low belt speed
3. Too hard pad
4. Too wide pad
5. Poor dust extraction or poor function of the air jet blower. Sometimes both
Actions
1. Decrease the sanding pressure
2. Increase the belt speed
3. Change to more soft pad
4. Try with a pad there the width is 80-90mm
5. Check the dust extraction and the air jet blower
5. Sanding faults: causes and actions 5.6. Straight short ridges
Description
Longitudinal, 10 – 50mm long and straight ridges.
Mostly appear when you are sanding lacquer
5. Sanding faults: causes and actions 5.6.a.
Straight short ridges
Causes
1. Too big removal because of to high sanding pressure
2. Too low belt speed
3. Too low conveyor speed
4. Poor dust extraction or poor function of the air jet blower. Sometimes both
Actions
1. Decrease the sanding pressure
2. Increase the belt speed
3. Increase the conveyor speed
4. Check the dust extraction and the air jet blower. Not: With good dust extraction and good cleaning of the belt, generally this type of problem do not appear
5. Sanding faults: Causes and actions 5.7. Straight ridges
Description
Longitudinal, straight ridges. Not oscillating.
This type of sanding fault is created by the sanding machine
5. Sanding faults: Causes and actions 5.7.a. Straight ridges