Benefits and problems of chrome tanning in leather processing: Approach a greener technology in leather industry

Abstract

Tanning is the process of converting the raw skin and hides from different animals into a sustainable and manageable material called leather. Leather making is a very long process and consists of many different chemical and mechanical process steps. The most important step of the whole leather making process is the tanning step, which is performed commonly either by vegetable or mineral tanning. More than 85-90% of the leather making is performed by chrome tanning, which is the most common type of mineral tanning currently applied.

Physical and Mechanical Properties of Sheepskin Pickled by Recycled Curing Salt

“…ermal stability results of the samples are different. One of the reasons for this difference is the difference in salt content used during samples pickling and another possible reason is that the collagen structure of the skin may vary from sample to sample; if the collagen fiber of the skin is highly crosslinked in nature, it greatly affects the mentioned property [1,4]. Generally, by recycling the salt from cured skin, it is possible to it for pickling purpose and it has a positive effect on tear strength of the treated skin compared to conventionally pickled one.…”

“…Leather processing is a very long process that consists of di erent chemical and mechanical steps including pretanning, tanning, posttanning, and nishing operation [1]. Leather sector and its manufacturing technology are among the emerging and developing sectors and have been highly contributing to the economic development of the world.…”

“…In leather processing, as soon as slaughtering is completed, the skins need to be cured and wait for next process. e pretanning process consists of soaking, eshing liming, deliming, bating, degreasing, and pickling unit operations [1,4]. Pickling process is done to reduce the pH of the bated pelt from 8.5 to 2.2-3.0 for chrome tanning and to about 4.5 for vegetable tanning [4,5].…”

Chemical Investigation and Separation of Chromium from Chrome Cake of BSCIC Tannery Industrial Estate at Hemayetpur, Dhaka, Bangladesh

“…Bangladesh Small and Cottage Industries Corporation (BSCIC) established large units of tannery industries at Hemayetpur, Savar, which is the outskirt of the capital city of Bangladesh [2]. Leather is a strong, fexible, and durable material obtained from tanning, or chemical treatment, of animal skins and hides to prevent decay [3,4]. Turning of skins and hides into leather requires the use of a number of chemicals.…”