What is Coating/Film Foaming?
The bag of synthetic materials used for bread packaging has many functional requirements such as being difficult to tear and easy to open, supporting a broad range of temperatures, light permeability, color, and making the slipperiness on the inside and outside different. All of these requirements cannot be met with just one type of material. A number of types of materials that have different characteristics are assembled using multi-layer technology. The selection of materials, the composition ratio of each layer, and their rheological properties (see the page about rheology) are all taken into account, then the overall thickness is controlled and it is turned into a film. Testing methods to verify the demanded performance and the accumulation of measurement standards is also important.
DIC's Coating/Film Foaming
DIC is expanding its supply of coextruded multi-layer films to many product genres like bread packaging, noodles, produce packaging for bean sprouts and other produce, three layer laminates, and easy-peel lid films. DIC provides optimal materials and their combinations with our knowledge for different usage conditions that includes heating and freezing.
Recently in retort packaging, demands are growing stronger to decrease their environmental burden against a background of container recycling and the depletion of oil resources, and there is a trend of further demands for thinner films and volume reductions. We naturally anticipate many problems occurring related to strength and light permeability, and our aim is the further evolution of multi-layer and blending technologies.
Examples of DIC products created by Coating/Film Foaming
Coextruded multi-layer film
We can design products that pay consideration to composition, materials, forms, filling machines, post-processing methods (boiling, etc.), and distribution in order to achieve both performance for securely protecting the package's contents and easy peelability.