Process of forming a thermoplastic sheet into a three-dimensional shape by clamping the sheet in a frame, heating it to render it soft and flowable. Then
applying differential pressure to make the sheet conform to the shape of a mold or die positioned below the frame.

• Thermoforming process
• Choosing The proper forming parameters
• Thermoforming tool design guidelines
• Thermoforming Troubleshooting

Types of Thermoforming

• Vacuum Forming
  Vacuum forming is a plastic thermoforming process that involves forming thermoplastic sheets into three-dimensional shapes through the application
  of heat and pressure. In general terms, vacuum forming refers to all sheet forming methods, including drape forming, which is one of the most popular.
  Basically during vacuum forming processes, plastic material is heated until it becomes pliable, and then it is placed over a mold and drawn in by a vacuum until it takes on the desired shape.
• Plug assist forming
  Plug assist forming is a widely used forming technique and requires the use of a female (cavity) mold. The limited depth of draw of female molds is improved by the use of plug assist.
• Vacuum snapback
  Vacuum-snap back is an excellent and often used process for forming deep draw products with uniform wall thickness. Vacuum is used to pre-stretch the
  hot plastic before the mold makes contact with the sheet. Vacuum snapback, while more complex than plug assist, can produce deeper drawn
  products with better wall uniformity and less mark-off. A vacuum pre-stretch box is required.
• Billow Forming
  A method of thermoforming sheet plastic in which the heated sheet is clamped over a billow chamber. Air pressure in the chamber is increased
  causing the sheet to billow upward against a descending male mold.
• Free Forming
  This method of thermoforming does not use a mold.  Instead, an acrylic sheet is clamped in a frame and either a vacuum or compressed air draws
  the material to a desired depth.  An electric eye determines when the proper depth has been reached and cuts off the pressure. Since only air touches the sheet of material, there is no markoff.
• Pressure Forming
  This process is similar to vacuum forming, except with the addition of pressure, which pushes the sheet into the shape of the mold. This process is
  mainly used for parts that require styling and aesthetic qualities because pressure forming creates greater detail, allowing for textured surfaces,
  undercuts and sharp corners, which are not as easily created with vacuum forming.
• Drape Forming
  In drape forming, a sheet of plastic is heated and stretched down, generally over a male mold. Next, depending on the shape of the mold, gravity alone
  will pull the material to the mold or commonly, a vacuum is applied to draw the sheet to the mold which will more detail to the inside of the part.
• Stretch Forming
  A plastic sheet forming technique in which the heated thermoplastic sheet is stretched over a mold and subsequently cooled. It is quick, efficient, and has
  a high degree of repeatability.
• Matched Die Forming
  In this process, both halves of the part are formed by molds with no vacuum or air pressure.  The sheet is heated until it is soft, and then both mold
  halves clamp together to form the part. Used with parts that do not have large draws.
• Inline thermoforming
  In this process the plastic film moves from a roll onto the inline equipment and through the heating section. The heated material advances into the
  forming section where pressure and/or vacuum force the plastic onto a mold. It then proceeds to another station where formed parts are die-cut.