Preparation method of food grade protein film

Abstract

The invention discloses a preparation method of a food-grade protein film. The weight percentage of gelatin in a food-grade protein film solution is 25-35 percent, the adding quantity of a plasticizer is 20-30 percent of the mass of the gelatin, the adding quantity of a film forming aid containing a weak oxidant is 1-5 percent (w / w) of the mass of the gelatin, and the adding quantity of a food-grade anti-caking agent is 0.01-0.1 percent (w / w) of the mass of the gelatin; the modulated protein film solution can be uniformly coated on a smooth Teflon steel strip and is easy to uncover after being dried and film-formed; after the protein film is placed in a clean workshop with a temperature of 20-40 DEG C and a relative humidity of 40-60 percent for 30 days under the action of the film-forming aid, the tensile strength can be improved. The preparation method disclosed by the invention has the advantages that the food-grade protein film is produced by utilizing the steel strip and is easy to uncover, the mechanical performance of the protein film can also be improved, and further, the industrialized production of the food-grade protein film is promoted.

Description

technical field [0001] The invention relates to a method for preparing a food-grade packaging film, which belongs to the technical field of food packaging material production, in particular to a method for preparing a food-grade protein film that can be easily peeled off and can improve tensile strength. Background technique [0002] With the strengthening of people's awareness of ecological environment protection, the use of natural polymer materials to prepare edible films to replace traditional plastic films has attracted increasing attention. Among them, the production of food-grade protein films using gelatin has become a focus of research scholars and enterprises. However, due to the strong heat sensitivity of gelatin itself, the high viscosity of the aqueous solution, and the high latent heat of evaporation, the formed collagen film is easy to stick to the wall, making it difficult to remove the film, which hinders the large-scale industrial production of collagen film...

AI Technical Summary

Problems solved by technology

However, due to the strong heat sensitivity of gelatin itself, the high viscosity of the aqueous solution, and the high latent heat of evaporation, the formed collagen film is easy to stick to the wall, making it difficult to remove the film, which hinders the large-scale industrial production of collagen films.

Moreover, the gelatin film solution is difficult to be evenly coated on a smooth Teflon steel belt due to its high cohesion.

Although the applicant discloses a preparation method of collagen film in Chinese patent CN102504302A, by adding edible hydrophobic substances, the collagen film is prepared by drying at low temperature and then high temperature, and the film can be peeled off to a certain extent. However, the effect is not ideal enough. In actual application, a scraper is needed to remove the film. This will not only cause the steel strip to be easily damaged, but also the continuous production will be interrupted if the protein film on the steel strip is not peeled off cleanly.