The plastic compound, heated to a semifluid state, is squirted into a mold under great pressure and hardens quickly. The mold then opens and the part is released. This process can be repeated as many times as necessary and is particularly suited to mass production methods. Injection molding is used for a wide variety of plastic products, from small cups and toys to large objects weighing 30 pounds or more. In the direct blow-molding method, a partially shaped, heated plastic form is inserted into a mold.
Air is blown into the form, forcing it to expand to the shape of the mold.
In the indirect method, a plastic sheet or special shape is heated then clamped between a die and a cover. Air is forced between the plastic and the cover and presses the material into the shape of the die. Without Them Suppose you could step inside a time machine and go back 60 or 100 years. Little things are often what are missed the most. Milk and shampoo used to be sold in glass bottles, and that wasn't a problem unless you dropped one and it broke.