The invention discloses a hollow
capsule, which comprises the following components in parts by weight: 10 to 30 parts of kappa-
carrageenan, 90 to 180 parts of water-soluble crosslinked
starch, and 20 to 40 parts of
plasticizer. The invention also discloses a preparation of the hollow
capsule, which comprises the following steps of: 1) dissolving gum, wherein
carrageenan and water-soluble crosslinked
starch are stirred, water at a temperature of between 70 and 90 DEG C is added into the mixture, the
plasticizer in the amount of the prescription is added and completely dissolved, and the mixture is stirred uniformly; 2) culturing the gum, wherein the gum liquid obtained in the step 1) is cooled to a temperature of between 40 and 45 DEG C, the gum liquid is insulated and stood for 30 to 60 minutes, and the gum liquid is put into a gum soaking tank; and 3) soaking the gum, wherein when the temperature of the gum liquid in the gum soaking tank is cooled to 35 DEG C, operations of gum soaking,
drying, shell pulling out,
cutting and buckling are automatically carried out through a
capsule template. According to the hollow capsule disclosed by the invention, the transparency and
toughness are remarkably improved, the
friability is remarkably reduced, and the product yield is greatly increased.