国家/地区 中国（3）
IPC部 B（3）
IPC大类 B05（3）
IPC小类 B05B（3）
IPC B05B013/02（2） B05B013/04（2） B05D003/04（2）
B05D007/02（2） C09D005/08（2）
发明人
公开年
申请年 2021（2） 
专利权人

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

Auxiliary device based on gluing and flattening, has working table is clamped with bottom surface and other is provided with cover surface.

ZHONG Y, ZHANG Y, TIAN G

Corrosion resistant polyethylene water supply pipe material comprises base layer and anticorrosive graphene coating comprising polyethylene, color master batch, epoxy resin and dispersant.

LIU J, WANG J, LI H