Shoe Making Technology: Spanish Study On Chrome Free Leather Technology

< p > although the role of chromate in leather making is very important, this substance and its residues are very harmful to the environment. In many countries, the law stipulates that the recycling plant must protect the environment from the harm of highly toxic tannery sewage.

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< p > chromium is a blue white polyvalent metal element. It has two valence chromium, trivalent chromium and six valent chromium.

It is hard, brittle and corrosion resistant, so it is mostly used for stainless steel and other products.

At the same time, chromium is also a necessary trace element of human body. However, excessive intake of chromium causes great harm to human body. Its toxicity is related to the existing valence state. The toxicity of two valent chromium is very slight, and the toxicity of trivalent chromium is very easy to appear in human body.

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< p > at present, the Spanish technology < a target= "_blank" href= "http://www.91se91.com/" > shoes < /a > Technical Association (INESCOP) is leading a new research project, aiming at developing safer leather making technology, adopting a chrome free process called Oxatan, which is based on environmental protection and the method of F zolane tanning.

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< p > the Spanish shoe Technology Association has spent several years looking for new materials to replace chromium used in tanning process.

This research has achieved excellent results. There is no evidence that the use of F zolane tanning < a target= "_blank" href= "http://www.91se91.com/" > leather < /a > will pollute the environment.

The objectives of the project are: < /p >

< p > promote the use of environment-friendly leather in shoemaking and furniture decoration industry < /p >

< p > reduce environmental pollution caused by leather making, shoemaking and furniture decoration industry < /p >

< p > reduce the environmental pollution caused by leather at the end of service life < /p >

< p > to help the shoe making and furniture decoration industry meet legal or voluntary environmental requirements in terms of harmful substances and environmental substances.

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The results and objectives of the P LifeOxatan project will be communicated in the following ways: networking, trade fairs, trade shows, special courses, user manuals and promotional videos for tanning technicians.

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< p > in addition to similar debates about whether the term "synthetic leather" is misused, the work of LeatherNaturally and ICT and CotanceLifeOxatan organizations will also help improve leather making technology to protect the environment and promote leather as a sustainable and biodegradable material suitable for shoemaking, furniture decoration and fashion production.

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< p > < strong > deputy director of enteral nutrition department of Peking Union Medical College Hospital Chen Wei: < /strong > < /p >

< p > if we consume a large amount of trivalent chromium over a long period of time, on the one hand, it will affect the antioxidant system of our body, and will easily get some chronic oxidative diseases, such as diabetes and hypertension. On the other hand, due to the damage of the antioxidant system, it is easy to develop tumors and other abnormal diseases.

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Compared with the trivalent < a href= "http://www.91se91.com/news/index_c.asp" > CR < /a > < p >, the toxicity of six valence chromium is stronger, which is about 100 times of the trivalent chromium.

In clinical practice, six valence chromium and its compounds do harm to human body, usually in three aspects.

First, it damages the skin, leading to dermatitis and pharyngitis; two, it damages the respiratory system, triggers pneumonia, tracheitis and other diseases, and the three is damaging the digestive system, eating or even contacting chromate for a long time. It is very easy to cause gastritis, gastric ulcer and intestinal ulcer.

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< p > experts also stressed that excessive intake of six valent chromium can cause renal failure and even cancer.

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