-
公开(公告)号：US6153293A
公开(公告)日：2000-11-28
申请号：US244641
申请日：1999-02-04
IPC分类号： B27N3/00 , B27N3/28 , B29C44/04 , B29C47/00 , B29C47/10 , B29C47/76 , B29C47/94 , C08L97/00 , C08K11/00
CPC分类号： B29C44/22 , B27N3/005 , B27N3/28 , B29C47/0004 , B29C47/0016 , B29C47/0019 , B29C47/003 , B29C47/1045 , B29C47/767 , B29C47/786 , B29C47/822 , B29C47/94 , B29C47/1009 , B29C47/1027 , B29K2105/0005 , B29K2105/06 , Y10S264/913 , Y10S264/92 , Y10T428/249955 , Y10T428/249958 , Y10T428/249961
摘要： An extruded composite structural artificial lumber product is manufactured from wood fiber and polyethylene, including recycled polyethylene, by reducing the wood fiber and polyethylene each to a finely divided particles, mechanically mixing the wood fiber and polyethylene particles together with a measured amount of a powdered endothermic foaming agent, mechanically mixing the mixture, without pre-pelletization, in a twin-screw extruder where it is compressed and heated until it becomes plastic and homogenous, and then extruding the plastic mixture, using vacuum to remove vaporized moisture and other excess volatiles, through a molding die which forms structural profile of the desired product. The endothermic foaming agent ingredient causes greater expansion in the center of the extruded profile, thereby compressing a greater proportion of plastic material against the sides of the extrusion die, increasing the density and strength on the outside of the extrusion, and reducing the density (with no significant loss of overall strength) on the inside. The resulting extruded artificial lumber product has a specific gravity of about 1.0, plus or minus 20%, with no significant variation in dimensions after cooling.
摘要翻译： 挤出的复合结构人造木材产品由木纤维和聚乙烯制成，包括再循环的聚乙烯，通过将木纤维和聚乙烯各自分解成细碎的颗粒，将木纤维和聚乙烯颗粒机械混合在一起并与测量量的粉末吸热 发泡剂，在双螺杆挤出机中机械混合混合物，在其中进行压缩和加热，直至变得塑性均匀，然后使用真空挤出塑料混合物以除去蒸发的水分和其它过量的挥发物， 通过形成期望产品的结构轮廓的成型模具。 吸热发泡剂成分在挤出型材的中心处引起更大的膨胀，从而将较大比例的塑料材料压在挤出模具的侧面上，增加了挤出机外部的密度和强度，降低了密度（与 没有显着的整体实力的损失）。 所得挤出的人造木材产品的比重约为1.0，加或减20％，冷却后的尺寸没有明显变化。
搜索结果
1 条记录 (耗时 0.009 秒)
