Blast treatment device and blast treatment method

A blast treatment device comprising:

• an injection part that injects media toward a workpiece made with a composite material comprising a resin, the media each having a weight difference from resinic particles departing from the composite material due to contact of injected media with the composite material;
• and
• a circulating system that recovers the injected media and supplies recovered media to the injection part,
• wherein the circulating system has an impurity separation part that removes, from the recovered media, media that is reduced in size following contact with the composite material and that has a particle size falling below a first threshold value, as well as impurities that have a particle size falling above a second threshold value higher than the first threshold value, wherein reduced in size media and impurities removed by the impurity separation part are precluded from being injected by the injection part,
• wherein the impurity separation part has a first stage removal section based on the weight difference between injected media and resinic particles, and a second stage removal section that is downstream from the first stage and separates, from the recovered media, selected media designed for return to the injection part, with the selected media having a predetermined size range that does not fall below or exceed, respectively, the first and second threshold values,
• wherein the first stage removal section includes a cyclone separator for separation of resinic particles from injected media based on weight differential, and
• wherein the second stage removal section includes a plurality of sieve trays supported on a vibrating body.

A blast treatment device comprising:

• an injection part that injects media toward a workpiece made with a composite material comprising a resin, the media each having a weight difference from resinic particles departing from the composite material due to contact of injected media with the composite material;
• and
• a circulating system that recovers the injected media and supplies recovered media to the injection part,
• wherein the circulating system has an impurity separation part that removes from the recovered media, media that is reduced in size following contact with the composite material and that has a particle size falling below a first threshold value,
• wherein the injection part has:
• at least one nozzle that injects the media toward the workpiece;
• a first tank that supplies the media to the at least one nozzle;
• a movement structure that moves the at least one nozzle and the first tank;
• and
• a second tank that supplies the media to the first tank, the second tank being configured not to be moved by the movement structure, and
• wherein the circulating system is configured such that the movement structure moves the first tank and the at least one nozzle while a supply line from the second tank to the first tank is disconnected.