Material Research

by 탕원 2023. 1. 3. 01:37

ABOUT EGGSHELLS

[ BACKGROUND ]
Eggs are one of the typical ingredients, and around 250,000 tonnes of eggshells are discarded worldwide every year.
Eggshells account for around 11% of the total weight of eggs and in Korea they are common waste that cannot be separated for recycling.
Recently, several companies in Korea have succeeded in usingdiscarded eggshells to create environmentally
friendly plastic containers. As more and more research and attempts are made to use these
discarded eggshells, waste will be reduced and serve as the basis for building a sustainable environment.

[ CHARACTERISTICS ]
Although light in weight, eggshells have strength and consist of approximately 95% calcium carbonate,
which has the characteristic of being naturally absorbed upon decomposition.
In addition, studies have shown that adding a small amount of eggshell to bioplastics can make soft but unbreakable biodegradable packaging materials

[ PREPARATION ]

Salmonella may be present in eggshells and can cause food poisoning. However, Salmonella is not heat resistant and is almost killed when heated at 70 degrees for more than 3 minutes.
Therefore, when using eggshells, it is recommended to boil or bake them to sterilise them. There is also the disadvantage of mould and insects in the manufacture of bioplastics.

THE WAY TO OPEN EGGS

EGG COLOR

1.Egg inner membrane

2.white

3.creamy-white

4.blue

5.light brown

6.red-brown

7.earthy yellow

8.dark brown

RECIPES

1. Eggshell, Gelatine, Glycerine, Water

2. Eggshell, Water, Glycerol, Agar agar, Eggshell

3. Eggshell, Tapioca starch, Vinegar, Glycerin, Water
4. Eggshell, Vinegar, Water, Sodium Alginate
5. Eggshell, Water, Potato starch, Glycerin
6. Eggshell, Gelatin, Cornstarch, Glycerol, Water
7. Eggshell, Gelatine ,Water
8. Eggshell, plaster, water
9. Eggshell, Water based acrylic resin
10. Eggshell, Water, Glycerol, Salt, Gelatin

This work tries out 10 material formulations and compares various aspects of use such as material hardness

and preservation, durability and water resistance.

The decision was made to use gelatine and water based acrylic resin.
Gelatine: hard, will shrink and deform naturally when dry. A base of egg powder mixed with egg fragments to form a pattern. Water based acrylic resin：hard, waterproof. Colours can be shown and forms can be maintained.