First, materials, medicines and supplies 1. Fresh or dried rabbit skin or meat rabbit hide 2. Drugs Industrial formaldehyde (formalin), sulfuric acid, salt, meal detergent, Glauber's salt (sodium sulphate), sodium carbonate (white alkali), washing powder, percolator JFC, soft leather white oil or synthetic fatliquor, Formic acid, ammonium sulfate, sodium thiosulfate. 3. Utensils Thermometer, acid and alkali test paper, scraper, semi-circular wood, tile cylinder, glass cylinder, measuring cup, beaker, coarse scale and so on. Second, methods and steps Batch and weighing of raw hides The raw hides are divided into batches according to thickness, area size, fresh or dried raw hides and dryness, and preservation time, and the raw hides with similar properties are divided into one production batch as much as possible, and 20 to 30 batches are suitable for manual operation and weighed. The raw hide weight serves as the basis for water consumption. 2. Inundation The purpose is to make the moisture in the skin close to the fresh skin and improve its softness. The amount of water added is 20 times that of dry weight or 10 times that of fresh skin. The water temperature is room temperature, and it is not less than 20 degrees. It is preferable to add 3 milliliters of detergent per kilogram of water and 0.5 ml of JFC. The soaking time is 24 to 36 hours. During the soaking process, the fur is turned over intermittently and the skin is prevented from exposing to the water surface. 3. Degreasing The purpose is to remove dirt, blood stains, and grease on the fur. The water volume is the same as above, the water temperature is 35-40°C, and the water is soaked in a suitable amount of detergent or laundry detergent for 1 to 2 hours. 4. Re-immersion The purpose is to make the skin more fresh, loose skin fibers to facilitate the removal of meat. Add water as above, add 1 ml sulfuric acid and 1 g sodium thiosulfate per kilogram of water. The re-immersion time is 2 to 5 hours. The skin is swollen and soft, and the re-soaking process is often stirred and turned. 5. Reveal meat After the double leaching, use sodium carbonate solution to neutralize, adjust the pH value to about 7.5 and maintain it for more than 2 hours, and then remove the meat. Method is to start from the tail, to the direction of the head, with a blunt knife or blade spade, can also be used to tear, but to prevent the skin plate. 6. Pickling The purpose is to soften and swell the fibrous tissue of the skin and prepare the tanning process. The amount of water added is 15 to 20 times the tare weight, and the water temperature is about 35°C. Add 50 grams of salt, 50 grams of Glauber's salt, 3 ml of concentrated sulfuric acid, 1 ml of formic acid, and 0.5 ml of JFC per kilogram of water. The pickling time is about 24 hours, and it can extend and flip the skin frequently. Check the effect of pickling the skin is to fold the fur, the skin out, in the fold at the hand squeeze, if the formation of white indentation, skin is very soft, and then the skin picked up and squeeze water until the basic can not be placed after the dripping In the liquid tanned. 7. Tanning The purpose is to loosen and stabilize the fibers of the skin and make the hair more firmly bonded to the dermis. The amount of water added to the liquid preparation is 15 to 20 times the tare weight. To each kg of water, 8 to 10 ml of formaldehyde, 40 g of salt, and 40 g of Glauber's salt are added. The water temperature is preferably kept at 35-37°C. After the acid-soaked skin was put into and stirred for half an hour, the pH of the mash was adjusted to 8-8.5 by slowly dividing it with sodium carbonate 3 to 4 times. The length of time must not be less than 24 hours. Check the tanning effect is to take a small piece of skin into the water, heated to 80 °C above, if the skin does not shrink, it shows that the system is better. After neutralizing, neutralization solution is used to neutralize, that is to say, pick up the good skin, wash it off with clean water, immerse it in water, add 1 g of ammonium sulfate per kilogram of water, 0.2-0.5 ml of formic acid, and adjust the pH value. The range of 5.5 to 6.5 is maintained for about 2 hours. 8. Fatliquoring The fatliquoring liquid is prepared by synthesizing a fatliquor or soft leather white oil, 9 parts of water is mixed, and heated to 50-60 degrees for use. Remove the skin from the neutralization liquid and squeeze the water. After the water is not dripping, roll the skin upwards. Draw the fatliquoring liquid with a clean cloth and spread evenly on the skin board. Allow them to fully absorb after stacking for 2 hours. 9. Shoveling and finishing Put the fur's hair facing inward and the skin board hanging on the bamboo basket, and let it dry in the ventilated place until it reaches 7 to 8 thousand. Then spread the skin on the round wood and use a blunt knife or blade to scrape the skin and make the skin soft. The board is soft and white. After scraping the ash, combing, and then drying to dry skin, put appropriate amount of mothballs on the rough surface to wrap it in a plastic bag. The rabbit skin produced by this method has a soft skin, a small contraction of the skin, and a full and shiny coat. The method is simple in technique, low in investment, low in cost, easy in operation, and free from environmental pollution. It is a rabbit fur tanning method worthy of promotion. Convenience Food
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