Guidebook programa
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Guidebook programa

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

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