It should be noted that conventional plastic injection machines are used to produce disposable forks & spoons & knives and thick disposable containers such as trays, dessert and ice cream containers and so forth. The only difference is the changeability of molds by which the containers can be produced in different models and cavities (number of products in each press) in accordance with customers’ order.

Generally, all disposable containers are divided in two categories: semi-forming (PS) and thermo-forming (PP). They differ in consuming materials, production stages and price. In all disposable container production machines the raw material melt and then are formed into sheets and get different shapes via pressing and shaping processes. In semi-forming machines, all above-mentioned stages are integrated and the consuming material is polystyrene (PS). These machines generally produce fragile containers. However, these machines produce majority of disposable containers, including bowls, cups, dishes and mushroom container. The reason is the low price of semi-forming machines compared to forming-machines. Since the containers are fragile and harmful, especially in dealing with hot, these machines are not recommended for producing disposable glasses.

The foam sheet unit adopts the double machine series high foam sheet production process. Adding a blowing agent during the extrusion of polystyrene raw materials by using this equipment. After grinding head extrusion, foaming, cooling, shaping, pulling, and winding into the finished sheet. PS foam sheet is a new type of packaging material, which has good thermal insulation and cushioning properties and also has a pearl-like appearance and color. After vacuum forming, the PS foam sheet is made into various types of food containers such as lunch boxes, trays, dishes, etc.

In addition, the insertion of the PS symbol indicates that it is made of polystyrene and such a container is in contact with hot and greasy foods due to the release of styrene carcinogenic monomer; therefore, these containers should not be used for food and hot drinks And fatty acids, and are used only for soft drinks and cold-fat foods. These containers are available in three types of polystyrene foam (EPS), expanded polystyrene (HIPS) and ordinary polystyrene containers (GPPS).

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