公开(公告)号：US3927156A

公开(公告)日：1975-12-16

申请号：US33275773

申请日：1973-02-15

申请人： KUREHA CHEMICAL IND CO LTD

发明人： YOSHIKAWA SHINSUKE ,  ENDO HIROYUKI ,  TERASAKI SHUJI

IPC分类号： B43K1/00 ,  B29C1/14

CPC分类号： B43K1/006

摘要： Method for producing a writing core having a porosity in the range of from 30 to 60%, which core is made from polyvinylidene fluoride powder having a bulk density of 0.5 to 1.0 g/ml and a uniform particle size range of 10 to 300 microns, produced by filling a mold with the powder, heating the powder to a temperature of from the melting point thereof to 350*C in a pressure-free state and heat-treating the formed core taken out of the mold at a temperature of from 70*C to a temperature lower than the melting point thereof for more than 3 hours.

摘要翻译： 用于制造孔隙率在30至60％范围内的书写芯的方法，该芯由具有0.5至1.0g / ml的堆积密度和10至300微米的均匀粒度范围的聚偏二氟乙烯粉末制成， 通过用粉末填充模具来制造，在无压力状态下将粉末加热至350℃的温度，并将从模具中取出的成形芯体在70℃的温度下进行热处理 C至低于其熔点的温度超过3小时。