WELCOME TO MY PROJECT WORK

POLYCHLOPRENE SOLUTION (NEOPRENE) Polychloroprene is a synthetic elastomer with many of the properties of natural rubber. These are prepared in number of grades depending on the crystallization rate. PROPERTIES: High bond strength Limited plasticizer resistance Easy handling Can use with brush or spray Difficult to remove if materials are contaminated Long tack life USES: 1.Fitting, laminating 2.Insole laminating 3.Insole rib attaching 4. Rubber and leather sole laying 5. Lasting 6.Heel covering

POLYURATHANE Polyurethane is produced when a di-isocyanate having two isocyanate groups is reacted with a diol havig two hydroxyl groups. PROPERTIES: Flammable Strong bond with most martial Superior plasticizer resistance Grease and oil resistance High green strength but at least 48 hours needed to reach full strength Difficult to remove if materials are contaminated USES: Sock attaching Sole attaching

CLASIFICATION OF POLYURATHANE

SOLE Properties of an ideal soling material: Processing needs: Low cost raw materials. Cheap to process. Easy to mould with good definition. Form strong bonds with conventional adhesives Can be recycled Wearing needs: Low density High elasticity High resilience High flexibility Good flex crack resistance Good wet and dry slip resistance Good abrasion (wear) resistance. Good water resistance Good rest resistance. Good cushioning ability Good shock absorption Good ageing resistance. Good appearance.

TYPES OF SOLING MATERIALS Leather Leather board Resin rubber Vulcanized rubber-solid -cellular Crepe rubber Thermoplastic Rubber (TR)-1.Solid , 2.Cellular PVC (Solid) PVC (Cellular) PVC (Blends) EVA (Cross-linked) EVA (Thermoplastic) Nylon (PA) Polyester, solid, units Polycarbonate.

ETHYLENE VINYL ACETATE (EVA) Characteristic non-rubbery smell when new but this fades. An extremely lightweight material, Usually soft. Available in all culours, but not translucent. Generally good appearance, Often found as a midsole (shock absorbing) layer in sports shoe,

Test report: For PU Applied adhesive Types of leather Sole Test result (Kg) Types of failure PU Semi aniline corrected grain EVA 1.25 Soling material failure Protein finish 1.0 Bond failure PU based Semi aniline Corrected grain Pigmented patent 0.5 Protein finish bag leather Aniline finish 0.75 Pigment finish corrected grain Semi aniline finish

For Neoprene Applied adhesive Types of leather Sole Test result (Kg) Types of failure Neoprene Semi aniline corrected grain EVA 2.25 Soling material failure Protein finish 2.00 PU based Semi aniline 1.6 Corrected grain Pigmented patent 2.5 Protein finish bag leather Aniline finish 2.0 Pigment finish corrected grain Semi aniline finish 1.0

CONCLUSION In my project-The standard value of EVA sole bonding is 2.25kg/mm2 under the standard pressure. I have experimented on different types of leather at laboratory of Bangladesh College of Leather Technology. I have found the satisfactory result from semi aniline finished leather and corrected grain pigmented patent to the standard value and the results were 2.25&2.50kg/mm2 respectively. So we can say, EVA sole is suitable for corrected grain pigmented patent leather.

THANK YOU