PRODUCTION OF SANDWICHED HOLLOW ARTICLES BY BLOW MOULDING Russian patent published in 2015 - IPC B29C47/04 

FIELD: process engineering.

SUBSTANCE: this invention relates to sandwiched hollow articles produced by blow moulding and to co-extrusion blow moulding for production of said articles. This process allows the production of sandwiched hollow article from thermoplastic polymers that feature the presence of relief and/or visual effect created by curls, waves, colour strips and/or variable light transparency. Note here that at least one layer represents a continuous layer with irregular variable depth which features discretely varying depth in circle and/or longitudinally.

EFFECT: specific surface relief and/or visual colour effect.

14 cl, 4 tbl, 22 ex