| 摘要 |
A puncture preventive sealant is capable of reducing the content of cellulose fibers for suppressing the cost of the sealant while keeping a high sealing performance due to the cellulose fibers. A sealant 8, which is filled in a sealant chamber 7 defined in a tube 2 adjacently to an air chamber 3, contains synthetic fibers and cellulose fibers in a solvent. The content of the synthetic fibers is in a range of from 75 to 90 wt% and the content of the cellulose fiber is in a range of from 25 to 10 wt%. Since the sealant 8 is filled in the sealant chamber 7 having a capacity significantly smaller than that of the air chamber 3, the separation of the synthetic fibers due to a centrifugal force substantially exert no adverse effect on the characteristics of the sealant, and accordingly, the content of the cellulose fibers can be set at such a minimum value as to block a large puncture hole. As a result, it is possible to reduce the cost by reducing the content of the cellulose fibers. <IMAGE> |
