One, the production method of fish scale glue

1, dip material: fish scales should be selected from the larger size of the fish is good. In order to facilitate the processing, must first be selected by class, and then after dipping alkali, dip acid, dip ash, neutralization of four processes. Dip alkali: using a concentration of 5% caustic soda solution soaked for 5 minutes to remove the oil on the scale and make the fish scale expansion. Rinse with water until no alkali odor. Then soak in dilute hydrochloric acid solution for 4 times, called dip acid, time 20-24 hours, of which the first time should be short, the fourth time is long. After the acid immersion with water to wash repeatedly, and then placed in 0.2% -0.4% of the lime water immersion, known as soaking ash, time 10-14 days, and finally washed, neutralized with dilute hydrochloric acid.

2, boiling glue: after the above treatment, you can put the fish scales in the steamer to boil the glue, boiling several times in a row, so that the gelatinous mention net until. Boiling temperature of 60-70 ℃ is appropriate, each boiling time for 2-3 hours, the amount of water for the scale weight of 1-1.5 times.

3, drying: boiled glue, remove the glue, filtered with a filter cloth while hot, packed in a shallow plate, so that it cools, solidified into jelly, with a scraper to scrape the glue into a thickness of 0.5-1 cm of thin slices, placed in the drying room for drying, that is, to get the finished product.

Two, the production method of fish swim bladder glue. Fish bladder is a valuable by-product. It can be removed from the belly when processing fish, and washed and dried after stripping off the blood film. The processing method of swim bladder glue: the swim bladder is first soaked in alum water with a concentration of 1%-1.5% for 5 minutes to remove the mucus. Then use scissors to cut it open and make it into slices. If the swim bladder is salted, it should also be impregnated with water to remove the salt. After washing, spread it on a cloth and place it on a press to remove the water, then stretch the swim bladder slices evenly to form ribbons. Wrap it with a wet cloth, and then use a round wooden stick or other crushing equipment to crush it repeatedly until it is completely fitted and leveled. Finally, it is dried under the sun to become fish glue.