Synthetic Last ManufacturingDepartment of Leather Engineering, KUET, Khulna-9203

Synthetic Last Manufacture1. Last designing or modeling : This is done in two ways—

a) New Last Design:

-Designed based on the market research and current fashion trends.

-A range of styles is developed by CAD/CAM system and fixed up all

parameters.

-The sample last mould is made and checked according to the desired

parameters.

-The model last is made and graded according to required size ranges.

- Mould of each size is prepared and the sample lasts in all sizes are

made. S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

b) Sample Last Design:

-The sample last is first scanned and

matched with the defaults values of different

dimensions or reset new values for different

dimensions.

-Metal mould is prepared according to

sample last.

-The sample last is graded to required size

ranges.S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

2. Mould Making:

-The raw material HDPP is first mixed up with various ingredients.

-The waste materials are also mixed up with the HDPP pillette.

-The prepared raw materials are poured into the vessel of the injection

moulding machine.

-HDPP melts and fills the cavity of mould.

-The last blocks are picked up and cut the common joint area.

-The last blocks are Cooled in water

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

3. Last Turning or Milling: -The last block is attached vertically to the clamp of the CNC last turning lathe.-The block is first roughly turned or milled gradually.

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

4. Hinge pin hole making: Two pin holes are drilled on the forepart and back part respectively.

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

5. V-cut making: The cone portion is cut vertically and then top plane is cut in angled from top to bottom so that the entire area is removed and the cut shape is V like.

6. Hinge cut making: The last is divided into two parts by cutting it from the middle of the V-cut bottom with a concave curve on top and a convex curve on bottom.

7. Hinge slot making: The hinge is fixed on the middle of the last V-cut and the position of hinge is slotted by a narrow knife on the both parts of the last.

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

8. Hinge fixing:

- The hinge is placed into the hinge slot.

-The hinge pins are usually shorter than the last

width.

-The last is checked by folding.

-Hinge pin holes are filled with molten HDPE

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

9. Last remilling: The flat knives gradually remove the materials from the last surface according to the required dimensions.

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

10. Toe stud and back stud removing: The toe stud and back stud are cut by a cutting machine and are roughed the area to make smooth.

11. Ferrule hole making and thimble fixing:

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

12. Last repairing: Any damage can be recovered by adding molten material into the required area.

13. Toe part and back curve roughing:

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

14. Metal plate making:

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

15. Stamping size, fitting and last code number with a colour.

16. Lasts are covered by paper and pairwise packed in a cartoon to store or dispatch.

S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

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S. M. Murshidur Rahman, Khulna University of Engineering & Technology (KUET).

Presented by:S. M. Murshidur Rahman

Department of Leather Engineering,Khulna University of Engineering & Technology (KUET), Khulna-9203,

Bangladesh.Email: murshidurkhulnabd@gmail.com

https://www.facebook.com/murshidur.rahman.5203

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