Intermediate Level Dyehouse Course
INTERMEDIATE LEVEL DYEHOUSE COURSE
LEARNING OBJECTIVES
Lecture 1 Overview of the Leather Industry
The relationship between the meat industry and the tanning industry
The different processing options available to tanneries
The factors that impact on the global tanning industry
Lecture 2 Beamhouse / Tanyard Operations
The different parts of the animal skin
What the beamhouse is in a tannery
The different process steps that take place in the beamhouse and the order in which they occur
The changes that take place to the raw material in the beamhouse
What the tanyard is in a tannery
The different process steps that take place in the tanyard and the order in which they occur
The changes that take place to the raw material in the tanyard
The difference between wet blue and wet white
Lecture 3 Splitting to Neutralization
The reason why hides are split and shaved
The reason why skins are only shaved and not split
The importance of the wetting back process
The reason why wet blue must be wet back properly
The types of chemicals used in the wetting back process
Process problems that can occur during the wetting back process
How to solve process problems during the wetting back process
The effect of rechroming on wet blue
The types of chemicals used in the rechroming process
Process problems that can occur during the rechroming process
How to solve process problems during the rechroming process
The iso-electric point
How pH affects the charge on collagen
The importance of neutralisation prior to the main dyehouse processes
The types of chemicals used in the neutralisation process
Process problems that can occur during the neutralisation process
How to solve process problems during the neutralisation process
The importance of the wash after the neutralisation process
Lecture 4 Retanning
Why leather is retanned
The different types of retanning chemicals
The properties that these different retanning chemicals give to the leather
Process problems that can occur during the retanning process
How to solve process problems during the retanning process
Lecture 5 Dyeing
Why leather is dyed
Different types of dyestuffs and the properties that they have
Colour theory and measurement
Practical methods of dyeing
Process problems that can occur during the dyeing process
How to solve process problems during the dyeing process
Lecture 6 Fatliquoring
Why leather is fatliquored
Some of the properties that fatliquors give to leather
What would happen if leather was not fatliquored
The different types of fatliquoring chemicals
Emulsion chemistry
Fogging of automotive leathers
How fatliquoring is carried out practically in the tannery
Process problems that can occur during the fatliquoring process
How to solve process problems during the fatliquoring process
Lecture 7 Fixation
Why fixation is carried out at the end of the dyehouse processes
What would happen if fixation is not carried out
Process problems that can occur during the fixation process
How to solve process problems during the fixation process
The importance of the final wash in the dyehouse
Process problems that can occur during the final wash
How to solve process problems during the final wash
The different possible processing options in the dyehouse
The properties required by different types of crust leather
How the dyehouse processes are manipulated to achieve the properties required by the crust leather
Lecture 8 Setting, Drying and Milling
Why leathers are set out
Problems that can occur during the setting out process
How leathers are dried
Problems that can occur during the drying process
Why leathers are conditioned
Process problems that can occur during the conditioning process
Why leathers are milled
Problems that can occur during the milling process
Why leathers are staked
Problems that can occur during the staking process
Lecture 9 Crust Leather Testing
The different tests carried out on crust leather
The equipment used to carry out tests
The reason why the different tests are carried out
Reasons why poor test results may be obtained
Unit 10 Post Dyehouse Operations
Why leathers are buffed
Why leathers are finished
The mechanical processes after finishing
The measuring of leather