Lead-free coating preserved egg production process

The preserved eggs are traditional products of our country and are loved by people. However, in the production of traditional preserved eggs, a certain amount of lead oxide is generally added, resulting in trace lead in the finished product. Lead accumulates in the human body and causes chronic poisoning. At the same time due to the use of muddy coating quality, cumbersome operations, but also affect the clean and beautiful preserved eggs. Introduce the production process of lead-free painted preserved eggs, use zinc salt instead of lead oxide, and use coating technology instead of slime coating. This eliminates the harm of lead to human body and supplements the essential zinc elements of the human body. And it is convenient and hygienic to eat, so it has broad prospects for development. The processing process is as follows: 1. Preparation of feed solution. Formula (to 200 duck eggs): 1.55% soda ash, 4.4kg quicklime, 0.77kg table salt, 50g tea powder, 28.4g zinc chloride, and 22kg water. Matching method: Put the soda ash and black tea in the bottom of the cylinder first, then pour the boiling water into the cylinder, stir it to make it completely dissolved, and then put the quicklime in batches (note that the quicklime can't be put in too much at once to prevent the boiling water from splashing and hurting people. ), stir until after self-dissolving. Take a small amount of the upper solution in a mortar, add zinc chloride and grind thoroughly to dissolve it, then pour it into the liquid, add salt after 3-4 hours, and stir well. After 24-48 hours of standing, stir well and remove the residue. 2, raw material inspection. Raw eggs should be fresh eggs of the same size, complete eggshell and the same color. Wash the selected eggs and dry them before use. 3, cylinder and filling materials. First, add a small amount of liquid at the bottom of the tank, put the qualified raw material eggs into the tank, and put it horizontally, avoid standing upright, layer by layer, and the top layer of eggs should be about 10cm away from the cylinder port in order to seal the cylinder. After the eggs are installed, the cylinder surface is pressed with bamboo to prevent the egg from floating when the liquid is poured. Then, the liquid that is cool to below 20°C is fully stirred and poured into the cylinder while stirring, until the eggs are completely submerged in the liquid. So far, cover the cylinder head. 4, soak management. First of all, to master the indoor temperature, generally 18 - 25 °C; Second, we must regularly check. Generally 25-35 days to get out of the tank. 5, out of the cylinder. After soaking mature preserved eggs, it is necessary to release the cylinder in time to avoid “aging”. Put the preserved eggs out of the bowl into the bamboo basket and use the residue supernatant (do not use raw water) to rinse the dirt on the shell. 6, coating. 1 coating preparation. Formula: 30% liquid paraffin, 2.6% division, 3.9% Tween, 3.5% triethanolamine, 60% water. Put the first three raw materials into the reaction pot according to the formula, slowly heat up, stir slowly, raise the temperature to 92°C, then quickly pour the triethanolamine into the reaction pot, and heat it to make the temperature reach 95°C. Stir. Cooled to room temperature, the resulting white emulsion is a white oil quality coating. Take paint 40%, water 60% into the container, stir, you can use. 2 coating method. The egg to be coated is immersed in the coating solution and immediately removed. The excess coating solution is drained and placed in the egg tart, which can be stored or sold. The preserved eggs produced by this method can be stored for six months.

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