Manufacturing line for manufacturing a compostable pod for brewing products and system for measuring and regulating the relative humidity of a biodegradable paper-based material

Abstract

The invention concerns a manufacturing line () for manufacturing a compostable pod () for brewing products (), said pod () being made of two complementary portions (). The manufacturing line () comprises at least one shaping line () for shaping the complementary portions (), the shaping line () comprising: —a handling unit () for handling the sheet () of biodegradable paper-based material with gas barrier biodegradable polymer; —a humidifying unit () for moistening at least one side of the sheet () of biodegradable paper-based material; —an optional pre-drying unit () for drying, at least partially, the at least one side of the sheet () of biodegradable paper-based material; —a forming unit () for shaping the sheet () of biodegradable paper-based material into one of the complementary portions (); and—a drying unit () for drying the at least one side of the sheet () of biodegradable paper-based material forming one of the complementary portions (); According to the invention, the shaping line () comprises at least one humidity sensor (S, S, S, S) for sensing the level of relative humidity of the biodegradable paper-based material forming the pod () said at least one humidity sensor (S, S, S, S) being positioned before or after at least said one of the handling unit (), the humidifying unit (), the optional pre-drying unit (), the forming unit () and the drying unit (). The invention further comprises a system for measuring and regulation the relative humidity of the biodegradable paper-based material forming the complementary portions () of the pod (). Additionally, the invention relates to a manufacturing process comprising the steps of measuring the relative humidity of at least one side of the sheet () of biodegradable paper-based material forming one of the complementary portions () of the pod () and regulating different steps of this process according the relative humidity measured in one or more of the shaping steps.