| 摘要 |
This invention relates to articles capable of being heated by magnetically coupled radio frequency energy. Bonding by induction heating can be used to seal bags and pouches, seal window panes, bind books, and the like. Induction heating can be used in situations where microwave heating is not suitable, such as, for example, in cases where the materials to be bonded absorb microwave energy, such as polar polymers, wood, or materials containing non-magnetic conductive particles. In these situations, it may be desirable to heat the bond area only and not the material to be bonded. This invention provides a composition comprising: (1) a susceptor of magnetically coupled radio frequency energy comprising a non-magnetic particulate substrate, e.g., an electrically insulative material in particulate form, bearing a thin magnetic coating, e.g., a magnetic inorganic film, and (2) a matrix that is substantially non-reflective of radio frequency energy, e.g., silicone rubber, which matrix can be heated upon the composition's being subjected to magnetically coupled radio frequency energy. It has been discovered that thin magnetic coatings on non-magnetic particles provide energy transfer with induction heaters equal to or better than many commonly used solid susceptor particles. It has also been discovered that the temperature of the composition of this invention can be regulated so as not to exceed a predetermined temperature. <IMAGE> |
