Laminated film and method for laminating films
The inventive concept relates to a laminated film and a method of laminating films, and the disclosed laminated film includes at least two films sequentially stacked and bonded to each other, wherein each of the films may be each independently a gastric film or an enteric film.
1. A laminated film comprising:
at least a gastric film and an enteric film, wherein the gastric film is disposed on and bonded to a surface of the enteric film,
wherein the gastric film comprises at least one selected from a water soluble entrapped material and a first poorly water soluble entrapped material,
wherein the enteric film comprises a second poorly water soluble entrapped material,
wherein the enteric film allows an aqueous medium to permeate therethrough, and
wherein the first poorly water soluble entrapped material and the second poorly water soluble entrapped material are the same or different,
wherein the laminated film is prepared by bonding a gastric film and an enteric film to each other by using an acidic solution as a medium, wherein the gastric film and the enteric film obtain surface adhesiveness when the films contact water,
wherein the bonding comprises
spraying the acidic solution on a first surface of one of the gastric film and the enteric film,
disposing the other of the gastric film and the enteric film on the first surface, and
compressing the gastric film and the enteric film to each other.
2. The laminated film of claim 1 , wherein the number of the films is an odd number, and the gastric film and the enteric film are alternately laminated.
3. The laminated film of claim 2 , wherein one side outermost film and the other side outermost film of the films are both gastric films.
4. The laminated film of claim 2 , wherein one side outermost film and the other side outermost film of the films are both enteric films.
5. The laminated film of claim 1 , wherein the first and second poorly water soluble entrapped materials each independently comprise at least one selected from an active pharmaceutical ingredient (API) and a functional food ingredient.