초록 ▼

The block comprises a central channel (2) which feeds a first molten plastic, and at least one secondary channel (5, 10) which feeds a different molten plastic and connects to the central channel (2) upstream of the die, the central channel (2) in the connection zone, being equipped with a flat port

The block comprises a central channel (2) which feeds a first molten plastic, and at least one secondary channel (5, 10) which feeds a different molten plastic and connects to the central channel (2) upstream of the die, the central channel (2) in the connection zone, being equipped with a flat portion (11) which alters the cross-section of the channel, the said flat portion (11) being mounted in a removable piece (12) coaxial with the central channel and arranged in a guide tube (13) which intersects the central channel (2) and runs through the feed block (1), the said block being equipped with means (20), (21) for gradually withdrawing the removable piece (12) via the guide tube (13) and for replacing it by another removable piece (18) equipped with an identical or different flat portion (19). The block is particularly suitable for feeding a flat die which delivers films, sheets or composite panels.

대표청구항 ▼

Feed block for a flat coextrusion die, comprising a central channel possessing an inlet which can be connected to a first feed source of molten thermoplastic, an outlet which can be connected to the flat coextrusion die and at least one secondary channel possessing an inlet which can be connected to

Feed block for a flat coextrusion die, comprising a central channel possessing an inlet which can be connected to a first feed source of molten thermoplastic, an outlet which can be connected to the flat coextrusion die and at least one secondary channel possessing an inlet which can be connected to a second source of molten thermoplastic, a distribution torus surrounding the central channel and an outlet connected to the central channel upstream of the flat coextrusion die, in which the central channel, in the zone where it connects to at least one secondary channel, is equipped with a flat portion which alters its cross-section, characterized in that the flat portion (11) is mounted in a removable piece (12) coaxial with the central channel (2) and arranged in a guide tube (13) which intersects the central channel (2) and runs from one side of the feed block to the other, the said feed block (1) being moreover equipped with means (20)(21) which make it possible gradually to withdraw the removable piece (12) via the guide tube (13) and replacing it by another removable piece (18) equipped with a flat portion (19), the said removable piece (18) having been introduced beforehand into the guide tube (13).