15LT31T: Tanning and Posttanning Operations. Leather Tech 3rd Sem Syllabus for Diploma DTE Karnataka C15 Scheme

Tanning and Posttanning Operations. detail DTE Kar Diploma syllabus for Leather And Fashion Technology (LT), C15 scheme is extracted from DTE Karnataka official website and presented for diploma students. The course code (15LT31T), and for exam duration, Teaching Hr/week, Practical Hr/week, Total Marks, internal marks, theory marks, duration and credits do visit complete sem subjects post given below. The syllabus PDFs can be downloaded from official website.

For all other leather tech 3rd sem syllabus for diploma c15 scheme dte karnataka you can visit Leather Tech 3rd Sem Syllabus for Diploma C15 Scheme DTE Karnataka Subjects. The detail syllabus for tanning and posttanning operations. is as follows.

Pre-requisites:

Knowledge of pre-tanning operations.

Course Objectives:

1. To understand & apply the various non-conventional tanning methods.
2. To understand & analyze the Post-Tanning operations like Neutralization, Dyeing, Fat liquoring, Fixing, etc.
3. To understand the properties developed by various mechanical operations.
4. To understand the principles of E.I. tanning method.

Course Outcomes:

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UNIT – I NON-CONVENTIONAL TANNING METHODS

Chemistry of Zirconium (Zr) tanning – Properties of Zr tanned leather – Various uses of Zr tanned leather – Chemistry of Aluminium (Al) Tanning – Properties of Al tanning – Various uses of Al tanned leather – Chemistry of Aldehyde Tanning – Properties of Aldehyde tanned leather -Various uses of Al tanned leather – Oil tanning – Properties of Oil tanned leather – Various uses of Oil tanned leather.

UNIT – II NEUTRALISATION AND RETANNING

Neutralization: Objectives, Principles, Degree of neutralization, Various Neutralizing chemicals, Effect of neutralization on dyeing and fat liquoring, Ideal conditions of neutralization, Over -neutralization, Re-tanning : Principles , Various re-tanning materials, Semi chroming, Chrome re-tanned leather, Combination tanning: Principles, Difference of properties of mineral and vegetable tan leathers, Problems faced in re-tanning, Mechanism of combination tannage HCHO/Oil, HCHO/Veg,HCHO/leather, Syntans: Definition, Classification, Uses, Dipole theory, Tanning power of syntans.

UNIT-III DYEING

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UNIT- IV FAT LIQUORING

Fat-liquoring -Definition, Objectives, Composition of fat liquor, Classification, Saturated/unsaturated fatty acids, Iodine value – Saponification Value – Acid value, Factors controlling fat liquoring, Effects of different oils on properties of leather, Disadvantages of natural fat liquor, Mechanism of fat liquoring, Currying/Stuffing: Definition, Objectives, Difference between fat liquoring and currying, Selection of oil for currying, Conditioning of oil, Various methods of currying, Stuffing mixtures.

UNIT- V POST TANNING MECHANICAL OPERATIONS

Splitting – Shaving- Sammying – Setting – Property developed by Setting in leather- Vacuum Drying – Over-hang drying – Staking- properties developed by Staking in leather- Different Staking methods- Milling of leather- Methods of Milling operation -properties developed by
Milling- Toggling- properties developed by Toggling- Glazing-Working Mechanism of glazing -Ironing of leather-method of Fur Ironing – Understanding and application of these operations to meet the end product parameters.

UNIT- VI MANUFACTURING OF HEAVY LEATHERS

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Reference Books:

1. Theory and practice of Leather manufacture -K.T. Sarkar.
2. Principles of leather manufacture – S.S.Dutta.
3. Leather Technicians Hand Book – J.H. Sharphouse
4. The manufacture of Upper Leathers, Tropical Product Institute, London-D.H.Tuck
5. A Practical guide to heavy leather processing – Fuel & Leather research Institute (1980) -ChoichiOgiwara.
6. Practical aspects of the manufacture of Upper leather – Indian Leathers Technologists Association (ILTA, 1980) – JyotirmayDey.

SUGGESTED LIST OF STUDENT ACTIVITIES

Note: The following activities or similar activities for assessing CIE (IA) for 5 marks (Any one)

1. Each student should do any one of the following type activity or any other similar activity related to the course and before conduction, get it approved from concerned Teacher and HOD.
2. Each student should conduct different activity and no repeating should occur

1. Collect the different types of tanned leather and make a report on the basis of the physical properties of the leather samples in handwritten form in 2 to 3 pages.
2. Visit the nearest tannery. Observe the various mechanical operations done on leather processing. Make a report on the significance of these operations in handwritten form in 2-3 pages.
3. Collect the various types of leather like shoe upper leather, upholstery leather, garment leather, glove leather, etc. and by manual observation compare the properties on the basis of the degree of neutralization.
4. Collect the information about manufacturing of heavy leather and make a report about the drawbacks in detail in 2-3 pages in hand written form.

Course Delivery:

• The course will be delivered through lectures and Power point presentations/ Video.

MODEL QUESTION PAPER (CIE)

1. Write the basic chemistry of Aldehyde tanning.
2. List out the properties of Zr-tanned leather.
3. Interpret the objectives and reasons of retanning. or Predict the properties difference between mineral and vegetable tanned leather.
4. Dramatize the neutralization operation for the following leathers in terms of pH:
1. Shoe Upper
2. Garment Leather
3. Glove Leather OR

Predict the effect of neutralization on Dyeing &Fat-liquoring.

MODEL QUESTION PAPER (SEE)

NOTE:

1. Answer any 6 questions from Section-A & 7 full questions from Section-B.
2. Each question carries 5 marks in section A.
3. Each question carries 10 marks in section B.

SECTION – A

1. Discuss the chemistry of Zr-tanning.
2. Summarize the properties of Al-tanned leather.
3. Interpret the various objectives of neutralization operation.
4. Define Dye & its characteristics on which it depends on.
5. Define fat-liquors & its objectives.
6. Express the importance of staking operation in detail.
7. Define the meaning of toggling & the properties developed by it.
8. Outline the various properties desired in sole leather.
9. Apply the astringency of tannins in vegetable tanning operation.

SECTION – B

1. Explain the method followed in Oil tanning. (5)
2. Dramatize the process of Al-tanning. (5)
1. Dramatize the neutralization operation for the following leathers in terms of pH:
1. Shoe Upper
2. Garment Leather
3. Glove Leather.
2. Illustrate the meaning of over neutralization of leather. (4)
1. Show the various points on which the tanning power of syntans depends on. (6)
2. Write the mechanism of formaldehyde/ oil tannage. (5)
1. Interpret the chemical principles involved in dyeing. (5)
2. State the uses of Mordant & its classification. (5)
1. Interpret the role of Iso-electric point in Dyeing. (5)
2. Differentiate between organic & inorganic dyes. (5)
1. Interpret the following terms related to oil (6)
1. Iodine Value
2. Saponification Value
3. Acid Value
2. Explain the properties of oil in terms of saturated & unsaturated fatty acids (4)
1. List out the various properties required in an oil used for currying/stuffing. (5)
2. Differentiate between fat-liquoring & currying. (5)
1. Explain the relation between vacuum drying & lowering of boiling point of water. (5)
2. Illustrate the objectives of Setting operations. (5)
1. List out the objectives of milling & various methods of it. (6)
2. Interpret the meaning of glazing operation on leather &its working. (4)
1. Design the modern method for the manufacture of vegetable tanned sole leather. (6)
2. Classify the various types of vegetable tanning materials available in the nature. (4)

For detail syllabus of all other subjects of BE Leather Tech, C15 scheme do visit Leather Tech 3rd Sem syllabus for C15 scheme.

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