Molding system, support arm, resin molding device, method for supporting supported member, mold, and method for producing molded body

A molding system, comprising:

• first and second parison forming devices;
• first and second molds configured to be opened and closed;
• and
• a control unit,
• wherein the first parison forming device comprises a first extruder, a first accumulator, and a first injection head,
• the first parison forming device is configured to form a first parison by injecting a first molten resin from the first injection head after the first molten resin extruded from the first extruder is accumulated in the first accumulator,
• the second parison forming device comprises a second extruder, a second accumulator, and a second injection head,
• the second parison forming device is configured to form a second parison by injecting a
• second molten resin from the second injection head after the second molten resin extruded
• from the second extruder is accumulated in the second accumulator,
• the first and second parisons are injected between the first and second molds,
• the control unit is configured to determine a timing of starting operation of at least one of the first and second parison forming devices and the first and second molds in a next cycle on the basis of history data in a past cycle;
• wherein the first parison is a first resin sheet,
• the first resin sheet is fed by a roller arranged between the first injection head and the first and second molds, and
• the control unit is configured to determine a rotation speed of the roller in the next cycle on the basis of the history data in the past cycle,
• the history data are a length of the first and second resin sheets,
• when a deviation of the length of the first and second resin sheets from a target value is equal to or larger than a threshold value in an immediately preceding cycle, the control unit makes a correction to increase or decrease the rotation speed of the roller in the next cycle.