Composition of biodegradable plant fiber raw material grains, and production method thereof

A method for producing biodegradable plant fiber raw material grains, comprising the following steps A to H:

• A. a raw materials acquiring step of acquiring raw materials of a composition comprising:
• 40 to 60% plant fiber powder;
• 20 to 30% starch;
• 10 to 20% vegetable gum powder obtained by fermenting starch;
• 2 to 15% water-soluble polymer glue;
• and 1 to 10% water-soluble cellulose derivative, and adjusting a ratio of each raw material depending on a planned processed product of the raw material grains and a processing and molding method;
• B. a fiber powder kneading step of putting the plant fiber powder into a first kneader, and rotating and kneading the plant fiber powder at a high speed under conditions of 10 to 30 minutes, 40 to 60° C., and 600 to 1200 RPM to soften the plant fiber powder;
• C. a starch kneading step of putting the starch and the water-soluble cellulose derivative into a second kneader, and rotating and kneading the starch and the water-soluble cellulose derivative at a high speed under conditions of 10 to 20 minutes and 600 to 1200 RPM to activate fluidity of the starch and the water-soluble cellulose derivative;
• D. a vegetable gum powder kneading step of putting the vegetable gum powder into a third kneader, and rotating and kneading the vegetable gum powder under conditions of 10 to 40 minutes and a rotation speed of 100 RPM or less to make the vegetable gum powder viscous;
• E. an overall kneading step of putting the plant fiber powder, the starch, and the vegetable gum powder kneaded, and the water-soluble polymer glue, into a fourth kneader, and agitating the plant fiber powder, the starch, the vegetable gum powder, and the water-soluble polymer glue for 10 to 40 minutes while setting a temperature to 40 to 80° C. to uniformly knead a mixed raw material;
• F. a strand molding step of loading the mixed raw material into a molding device including a raw material inlet provided at one end, a raw material outlet provided at another end, and a transport unit provided between the raw material inlet and the raw material outlet, rotating and agitating the mixed raw material while transporting the mixed raw material from an end of the raw material inlet to an end of the raw material outlet by using the transport unit and also heating the mixed raw material, and extrusion-molding the mixed raw material into a plurality of string-shaped strands through the raw material outlet;
• G. a cutting granulation step of first cooling the plurality of string-shaped strands by using a first cooling system, and then cutting the plurality of string-shaped strands into granular raw material grains by using a cutting unit;
• and
• H. a raw material grain cooling step of cooling the raw material grains cut, by using a second cooling system and transporting the raw material grains to a storage tub, and then packaging the raw material grains into a product.