Due to different materials, the production process of biodegradable lunch box is also different. The following takes the biodegradable lunch box of plant fiber and starch as an example to introduce its general production process:
Biodegradable vegetable fiber lunch box
Raw material collection and screening: bamboo, rice husk, bagasse and other plant fiber raw materials shall be selected, and the raw materials shall be free of mildew and impurities. For example, in the production of bamboo fiber lunch boxes, bamboo with appropriate growth years is preferred to ensure fiber strength.
Fiber extraction and treatment: extract fiber from raw materials by mechanical crushing, chemical cooking or biological enzymatic hydrolysis, and conduct purification, bleaching and other treatments to improve fiber purity and performance. For example, bamboo is cooked with sodium hydroxide and other chemicals to separate cellulose.
Pulping and molding: mix the treated fiber with an appropriate amount of water to make a slurry, add environmental friendly adhesives and other additives, pour them into the mold, and form them by molding and hot pressing. Control the pressure, temperature and time to make the lunch box have good shape and strength.
Drying and post-treatment: dry the shaped lunch box to remove moisture, then trim and polish it to make the edge smooth, and then disinfect and package it.
Starch biodegradable lunch box
Starch pretreatment: corn starch and potato starch are selected for impurity removal and drying, and the water content is adjusted to make the starch reach the appropriate processing state.
Additive and mixing: plasticizer, lubricant, cross-linking agent and other additives are added to the starch and fully mixed in the mixing equipment to evenly disperse the additive and starch and improve the processing and physical properties of the starch.
Molding: injection molding, extrusion, blow molding and other molding methods are adopted. For example, during injection molding, the mixed material is heated to the molten state, injected into the mold cavity, cooled and solidified.
Post treatment and packaging: demoulding, trimming, deburring, etc. shall be carried out after forming, and surface treatment shall be carried out according to needs, such as coating oil-proof and waterproof coating, which shall be packaged and warehoused after passing the quality inspection.
