发明名称 |
SHEET ROOFING MATERIAL |
摘要 |
A composite sheet material especially suited as a roofing material is disclosed. The sheet is a composite of extruded top and bottom layers. The top layer is formed by extrusion of a mixture of cured rubber particles dispersed in a matrix of polypropylene. The bottom layer is formed by coextrusion with the top layer of a mixture of calcium carbonate and cured rubber particles dispersed in a matrix of polypropylene. The method of fabricating the composite sheet material includes trimming longitudinal edges of the material with powered circular blades as it moves between chill rollers and a pull roller assembly. The material is spooled with minimum winding tension so as to prevent tension forces from being set in the material. |
申请公布号 |
AU3327689(A) |
申请公布日期 |
1989.10.26 |
申请号 |
AU19890033276 |
申请日期 |
1989.04.21 |
申请人 |
IMPACT EXTRUSIONS, INC. |
发明人 |
GEORGE D. HOWELL;IRVIN E. HURT;R. MICHAEL MAHAN |
分类号 |
B32B27/18;B29C47/06;B29C47/34;B29C47/56;B29C69/00;B29C70/60;B32B5/30;B32B27/32;B32B37/15;B32B38/10;E04D5/10 |
主分类号 |
B32B27/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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