| STEEL BELT FOR A ROTARY PRESS | | | | example, continuous vulcanisation of rubber webs, a |
| A dark coloured heat-absorbing layer provided on the | | | | web portion which lies adjacent a brightly polished |
| inner face of an endless steel belt in a rotary press | | | | weld of the endless pelleting machine will be |
| for continuous pressing of materials to provide | | | | vulcanised to a lesser degree than a web portion |
| uniform absorption of heat by the belt from the | | | | which lies adjacent another portion of the endless |
| heating means. | | | | steel belt and weak portions of the web may thus |
| The invention relates to steel belts for rotary | | | | be produced. |
| presses. | | | | In the case of continuous pressing of chips to form a |
| Rotary presses incorporating endless flaker belt can | | | | chip-wood plate, portions of the plate which lay |
| be used for continuous pressing of chip-wood plates | | | | adjacent a weld of the endless steel belt during |
| or for continuous vulcanising and/or hardening and | | | | pressing may be visibly distinguishable on the finished |
| cross-linking of webs of rubber and synthetic plastics | | | | chip-wood plate, because these places were |
| material. | | | | subjected to a lower temperature during pressing. |
| Such steel belts may be formed from a steel strip | | | | According to the invention there is provided on an |
| with its ends welded together transversely and, in | | | | endless steel belt in a rotary press for continuous |
| order to obtain a working width of, for example, 2.50 | | | | pressing of chip-wood plates, or for continuous |
| m, may be formed by longitudinally welding together | | | | vulcanising and/or hardening and cross-linking of |
| several narrow steel belts. The welds are | | | | rubber and syntheric plastics material webs, where |
| subsequently ground smooth on the inner and outer | | | | material to be treated is pressed between the |
| faces of the belt to obtain smooth surfaces for the | | | | endless steel belt and a heated rotating drum, a dark |
| steel belt manufacturer. | | | | coloured heat-absorbing coating provided on the inner |
| Steel belts formed by welding together several | | | | face of the endless steel belt. |
| narrow steel belts, have a high tensile strength; | | | | In a further development of the invention, the inner |
| however, they also have the disadvantage that their | | | | side of the endless steel belt may be darkly browned. |
| inner faces do not have a uniform reflecting capacity, | | | | The dark coloured heat-absorbing layer on the inner |
| that is to say the smoothly polished welds are | | | | face of the endless steel belt may be an inorganic |
| brighter than the remainder and therefore they | | | | pigment, for example an iron oxide black. |
| reflect heat radiations more strongly. | | | | Through this measure according to the invention, it is |
| The heat reflection and therefore the heat | | | | achieved that the heat absorption on the entire inner |
| transmission of the steel belts, thus is non-uniform | | | | side of the endless steel belt is uniform, and |
| during heating by means of radiation heating means, | | | | therefore also the material to be treated is subjected |
| and material to be pressed in the rotary press is | | | | to a uniform temperature. |
| heated non-uniformly. Consequently, during, for | | | | |