Foam lunch box refers to tableware made of disposable expanded polystyrene plastic. The foam lunch box has the characteristics of oil resistance, water resistance, corrosion resistance, heat preservation, and heat insulation. The polystyrene plastic pellets and the blowing agent are heated together, the plastic pellets become soft, and the volume expands up to times at the same time. The expanded polystyrene plastic is cooled, reheated, and shaped using molds to become lunch boxes, plastic cups, plastic dishes, and other products. An expanded polystyrene product weighs times less than a regular polystyrene product of the same size. Therefore, the cost of using expanded polystyrene to make lunch boxes is greatly reduced.

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.

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.

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).

The automatic vacuum forming machine is a new type of thermoforming unit that integrates and cuts. This fully automatic vacuum forming machine is used in the fully automatic PS foamed lunch box production line. The semi-automatic vacuum forming machine does not have the function of cutting. The automatic vacuum forming machine adopts the man-machine interface computer touch screen control system, which is easy to operate. It has the characteristics of large forming area, convenient cutting and fast forming speed. The equipment can be used to produce a wide variety of shaped sheets. The shape of the finished product can be achieved by changing the mold.