T/XJBSLH 004-2025 Production Technical Specifications for Dried Peeled Walnut Kernels

Scope

Main technical content: 5. Dry peeling production of walnut kernels 5.1 Raw material and auxiliary material management 5.1.1 Factory inspection - Conduct visual inspections of the transported walnut kernels and retain those that pass the initial inspection. 5.1.2 In-warehouse inspection - Inspect the retained walnut kernels in accordance with GB 14881 requirements and handle the warehousing procedures after passing the acceptance inspection. The kernels are then sorted into original conical silos based on their quality. 5.2 Raw material and auxiliary material processing 5.2.1 Wind selection - Use wind separators to remove light impurities and immature kernels. The impurities removed during wind selection must not contain intact normal oilseeds. 5.2.2 Magnetic selection - Use permanent magnetic rollers to remove magnetic impurities. The magnetic metal content must be less than or equal to 0.003 g/kg. 5.2.3 Screening - Use vibratory screens to remove large and small impurities and immature kernels from the oilseeds. The amplitude should be between 4.5 mm and 5.5 mm. The impurity content must be less than or equal to 0.3%. 5.2.4 Stone removal - Use gravity grading stone removal machines to remove parallel stones and impurities. Check whether the sand and stones contain intact normal oilseeds. The sand and stone content must be less than or equal to 0.02%. 5.2.5 Shell removal - Adjust the process and sieve pore size based on the walnut variety characteristics. The removal rate must be 99%, and the internal fan temperature must be controlled within 30 °C. 5.2.6 Color selection - Use photoelectric detection technology to adjust the color selection process and resolution mode based on the optical characteristics of the re-selected oil-producing walnut kernels. Separate the oil-producing walnut kernels from the oilseed shells. The main process indicators of the color selection process are: the content of mixed oil-producing walnut kern

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