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Principle: The material undergoes chemical changes in the extrusion heating process, reorganized, and the water molecules vaporize instantaneously at the outlet, thus expanding.
Characteristics: The process is simple, the production is continuous, the coarse grains are meticulous, the taste is good, it is not easy to be regenerated, and it is easy to preserve.
Equipment: single-screw extruder (Dalian Shuiyuan 948).
Uses: Processing and organization of low-value fish.
7. Membrane Separation Technology Ultrafiltration: The solution is forced through a microporous semipermeable membrane using pressure (1 MPa) and the molecules in the solution are trapped.
Features: No phase change, low energy consumption, continuous production.
Application: Concentration, sterilization.
Nanofiltration: Desalination.
Ion membrane: Deacidification.
Inorganic membrane: processing wastewater treatment.
Eight, supercritical fluid extraction in the supercritical state extraction and separation process.
Rationale: Under supercritical conditions, slight changes in temperature or pressure can cause large changes in fluid density. The fluid entrained material is increased or decreased to achieve the purpose of extraction or separation.
Features: good selectivity, low residue, no toxicity.
Applications: DHA, EPA, active substances, spices.
Equipment: Atmospheric pressure supercritical, low pressure supercritical equipment.
Nine Biotechnology
1, thrombin, increase the gel strength; 2 glutamyl transferase, improve the gel strength; 3 lipase, alkaline lipase remove fat from high fat fish; 4 non-specific chitosanase, papain Preparation of low molecular weight chitosan.
Introduction to New Technology of Aquatic Products Processing (II)
6. After the pretreatment and mechanical action of the extruded material, it is forced through a die opening to form a product that is in a shape and in an organized state.