Starch-based films

MATER-FOLIO (packaging film) Starch-based copolyester ASAHI SOGYO... 

Desizing by chemical decomposition is applicable to starch-based sizes. Since starch and its hydrophilic derivatives are soluble in water, it might be assumed that a simple alkaline rinse with surfactant would be sufficient to effect removal from the fibre. As is also the case with some other size polymers, however, once the starch solution has dried to a film on the fibre surface it is much more difficult to effect rehydration and dissolution. Thus controlled chemical degradation is required to disintegrate and solubilise the size film without damaging the cellulosic fibre. Enzymatic, oxidative and hydrolytic degradation methods can be used. 

Castronuovo D, Candido V, Margiotta S, Manera C, Miccolis V, Basile M, D Addabbo T (2005) Potential of a corn starch-based biodegradable plastic film for soil solarization. Acta Hort (ISHS) 698 201-206... 

An edible film should have good water vapor barrier properties (low or no water permeation and diffusion through film), which should not increase or increase very little with increasing relative vapor pressure (Lawton, 1996). Films should withstand mechanical stress and strain to such an extent that they do not break easily under a decent mechanical force (Talja et al, 2008). Thus, composition of starch-based films is an important factor influencing its barrier and mechanical properties. Also, starch-based edible films may have an impact on the sensory and textural characteristics of the food. 

Bertuzzi, M. A., Castro Vidaurrea, E. F., Armadaa, M., Gottifredia, J. C. (2007). Water vapor permeability of edible starch based films. Journal of Food Engineerings 80s 972-978. 

Rodriguez, M., Osels, J., Ziani, K., Mate , J. 1. (2006). Combined effect of plasticizers and surfactants on the physical properties of starch based edible films. Food Research International, 39, 840-846. 

Talja, R. A., Heleln, H., Roos, Y. H., Jouppila, K. (2008). Effect of type and content of binary polyol mixtures on physical and mechanical properties of starch-based edible films. Carbohydrate Polymers, 71, 269-276. 

The focus of this work was to determine if a glyco-peptide or a simple dextrinized, oxidized starch could be produced which would enhance the behavior of a starch-based polymer for spray dried flavoring production. Enhancement of a starch s lipophilic/hydrophilic balance was anticipated to maintain the polymer s film forming" and cohesive wall development during the spray drying process while improving its emulsifying/interfacial activity capabilities. 

There is also US research interest in using pectin in polymer applications. Pectin is a complex plant cell wall heteropolysaccharide (based on galactose, rhamnose, arabinose and xylose) that can be blended with synthetic polyvinyl alcohol (PVA) to produce biodegradable polymers with a wider range of properties than those of starch-based polymers alone. The new pectin/PVA biodegradable polymer should be capable of replacing conventional PVA applications in blow-moulded, extruded, film and injection-moulded applications. 

Since starch is biodegradable, it has found use as filler in polymers, such as extruded films applied to paperboard for use in packaging.295,296 The starch is incorporated in granular form,297 as an octenylsuccinate derivative298 and in other forms. Starch-based blown films are prepared from starch-poly(ethylene-co-acrylic acid) formulations.299... 

Historically, chemical modification of starch was the first widely-investigated method for producing starch-based plastics. Attempts at forming cast films from starch or amy-lose showed that the properties were highly dependent on relative humidity the films became brittle at low humidities.4 Figure 19.2 shows data for films of various amylose/ amylopectin ratios conditioned at 50% relative humidity and 23°C. Efforts to overcome... 

Most of the things you can see about you at this moment are made of organic polymers. Skin, clothes, paper, hair, wood, plastic, and paint are among them. Teeth, muscle, glue, cling film, starch, crab shells, and marmalade are all polymer-based too. In this chapter we will explore the world of polymers. We will ask questions like these ... 

Following the sale of the film business to Novamont in 2000, Biotec offers starch-based materials for foodservice products and pharmaceutical applications. 

Under the Mater-Bi trademark, Novamont produces different classes of starch-based biodegradable materials and blends of starch with synthetic polymers. Each class is available in several grades to meet the needs of specific applications. Classes include grades for film and sheet extrusion, injection moulding and foams. 

Wemterra blown films are starch-based biodegradable and compostable materials. They are certified in accordance with DIN V 54900 (Germany) OK Compost and VGS-Tabel (including OK-Compost-Label, Belgium). Wenterra film is used for manufacture of bio-waste disposal bags and sacks. 

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