![]() ![]() The cracklings are further ground to make meat and bone meal.Ī variation on a dry process involves finely chopping the material, fluidizing it with hot fat, and then evaporating the mixture in one or more evaporator stages. The material is first ground, then heated to release the fat and drive off the moisture, percolated to drain off the free fat, and then more fat is pressed out of the solids, which at this stage are called "cracklings" or "dry-rendered tankage". This may be a batch or a continuous process in which the material is heated in a steam-jacketed vessel to drive off the moisture and simultaneously release the fat from the fat cells. Much of the inedible raw material is rendered using the "dry" method. Materials that for aesthetic or sanitary reasons are not suitable for human food are the feedstocks for inedible rendering processes. Rendering processes for inedible products Most edible rendering is done by meat packing or processing companies. The separated fat may be used in food products, or if in surplus, may be diverted to soap making operations. The solids may be used in food products, pet foods, etc., depending on the original materials. The second stage further separates the fat from the water. The first stage separates the liquid water and fat mixture from the solids. The process usually consists of finely chopping the edible fat materials (generally fat trimmings from meat cuts), heating them with or without added steam, and then carrying out two or more stages of centrifugal separation. Edible rendering is generally carried out in a continuous process at low temperature (less than the boiling point of water). Rendering processes for edible products Įdible rendering processes are basically meat processing operations and produce lard or edible tallow for use in food products. The processing plant may be operated by an independent company that buys input material from suppliers, or by a packing plant that produces the material in-house.Rendering may be done either in discrete batches or in a continuous process.The temperature range used may be high or low.In dry processing, fat is released by dehydrating the raw material.In wet processing, either boiling water or steam is added to the material, separating fat into a floating phase.The material may be processed by wet or dry means.Whether the end products are used as human or animal food depends on the quality of input material and the processing methods and equipment.The rendering process varies in a number of ways: The most common animal sources are beef, pork, mutton, and poultry. This material can include the fatty tissue, bones, and offal, as well as entire carcasses of animals condemned at slaughterhouses and those that have died on farms, in transit, etc. In animal products, the majority of tissue processed comes from slaughterhouses, but also includes restaurant grease, butcher shop trimmings, expired meat from grocery stores. The rendering process simultaneously dries the material and separates the fat from the bone and protein, yielding a fat commodity and a protein meal. It can also be applied to non-animal products that are rendered down to pulp. Rendering can be carried out on an industrial, farm, or kitchen scale. Rendering can refer to any processing of animal products into more useful materials, or, more narrowly, to the rendering of whole animal fatty tissue into purified fats like lard or tallow. Rendering is a process that converts waste animal tissue into stable, usable materials. ( Learn how and when to remove this template message) ( November 2022) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. ![]() This article includes a list of general references, but it lacks sufficient corresponding inline citations.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |