国家/地区 中国（2）
IPC部 B（2）
IPC大类 B29（2） C08（2） F16（2）
IPC小类 B29D（2）
IPC B29D023/00（2）
发明人
公开年 2023（2）
申请年 2022（2） 
专利权人

Double-wall corrugated pipe material outer wall and inner wall, where outer wall comprises e.g. chlorinated polyvinyl chloride resin, grafted polyethylene solubilizer, light shielding agent, ultraviolet light absorber, strengthening agent graphene, lubricant, and nano calcium carbonate.

LUO Q, YE C, ZHENG S, CHEN G, ZHANG S

Preparing internal spiral polyvinyl chloride drainage pipe, comprises e.g. bending and spiraling steel wire, extruding, injecting into brushing mechanism, carrying out spiral groove processing, forming inner spiral groove, spraying, extruding, painting and performing preliminary drying.

LIU Z