This high impact material is hygienic and capable of retaining heat and its shape when warm water is applied and is commonly used to package taste and odor sensitive products. This is molded around a wood, structural foam or cast or machined aluminium mold, and can form to almost any shape. The most common and easiest to use thermoplastic is high impact polystyrene sheeting (HIPS). Suitable materials for use in vacuum forming are conventionally thermoplastics. Relatively deep parts can be formed if the formable sheet is mechanically or pneumatically stretched prior to bringing it into contact with the mold surface and applying the vacuum. Thermoforming of plastic material A simple visualization of the forming process Vacuum forming machine to produce inner liner/food liner of refrigerator
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