Vacuum forming machine and method of making vacuum formed product

A vacuum forming machine for attaching a decorative sheet onto a base member, the vacuum forming machine comprising:

• a holder arranged to hold the decorative sheet;
• upper and lower boxes separated by the decorative sheet and the holder;
• a pressure reducer arranged to reduce pressures inside the upper and lower boxes;
• a first valve arranged to adjust a degree of pressure reduction inside the upper box;
• a second valve arranged to adjust a degree of pressure reduction inside the lower box;
• a heater arranged to heat the decorative sheet;
• a temperature information collector arranged to collect temperature information about the temperature of the decorative sheet;
• and
• a controller programmed to control opening/closing operations of the first and second valves based on the temperature information while the pressure reducer is operating.