4 The outer cup is formed made of plastic, it is made through a process known as blow molding. In blow molding, small pellets of plastic resin are heated and forcefully blown into a mold in the desired shape. If the outer cup is made of stainless steel, it pounded into shape from a sheet of stainless steel.
5 In an assembly line process, the formed outer cup is fitted with its inner liner. A glass filter, made outside the factory, or a stainless still filter, pounded from a sheet of stainless steel, is placed inside the outer cup.
6 Next, the insulation is added. For a coldinsulated bottle, foam in a liquid form is sprayed into the space between the cups and allowed to harden. For a hot-insulated bottle, a large vacuuming machine sucks the air from the space between he two cups.
7 A silicone seal coating is sprayed on the cups, holding them together to form a single unit.
8 Steel bottles are then painted.
9 The company logo is pad-printed onto each bottle or a sticker with the company name is placed on the bottle. Pad-printing creates a permanent stamp in the material, rather than on it.
10 After the insulated bottles pass quality inspections, they are wrapped and prepared for shipping.
The top
11 Like the bottle, the top of the insulated bottle is blow molded. If the top has a stopper (many insulated bottled have stoppers that can be pulled upward from the cap. Liquid flows through a small hole in the stopper), that is also blow-molded.
12 A tiny hold is punched in the stopper to allow liquids to flow through it.