Method for automatically regulating the size of a slot of a nozzle assembly and control and/or regulation system

Patent metadata

Field	Value
Publication number	US-12059833-B2
Application number	US-201917055019-A
Country	US
Kind code	B2
Filing date	May 15, 2019
Priority date	May 16, 2018
Publication date	Aug 13, 2024
Grant date	Aug 13, 2024

Abstract

The invention relates to a method for automatically regulating the size of a nozzle discharge slot of a nozzle assembly, wherein the nozzle assembly comprises a first and a second nozzle lip and a nozzle discharge slot arranged between the nozzle lips for setting in a controlled manner a thickness profile of a conveyable melt. A plurality of adjusting elements, in particular a plurality of adjusting pins, coupled to a respective thermoelement, is arranged on the first nozzle lip, the thermoelements being controllable by the regulation in such a way that the slot can be adjusted by the action of a mechanical force from the respective adjusting element on the first nozzle lip, as a result of the expansion or contraction of the thermoelements. At least two adjusting elements are adjusted simultaneously. The invention further relates to a control and/or regulation system.

First claim

The invention claimed is:

1. A method for automatically regulating the size of a nozzle discharge slot of a nozzle assembly, wherein the nozzle assembly comprises a first and a second nozzle lip and a nozzle discharge slot arranged between the nozzle lips for setting in a controlled manner a thickness profile of a conveyable melt, wherein a plurality of adjusting elements is arranged at the first nozzle lip, which are coupled to a respective thermoelement, wherein the thermoelements are controllable by the regulation in such a way that the slot adjustment can be realized by the action of a mechanical force from the respective adjusting element on the first nozzle lip as a result of an expansion or contraction of the thermoelements,
wherein
at least two adjusting elements are adjusted simultaneously,
the adjustment of the adjusting elements executed automatically based on measurement signals of at least one infrared sensor, ultrasonic sensor or optical sensor,
wherein the sensor is arranged at the nozzle assembly and configured to measure the thickness profile of the melt, and;
the adjusting elements are adjusted depending on quality criteria, stability criteria or quality and stability criteria of the conveyable melt.

2. The method according to claim 1 ,
wherein
all adjusting elements are adjusted simultaneously.

3. The method according to claim 1 ,
wherein
the adjusting elements are adjusted over an equal stroke, thus enabling parallel adjustment.

4. The method according to claim 1 ,
wherein
at an initial operation of the nozzle assembly for conveying the melt, the adjusting elements for subsequent regulation of the slot size are set uniquely free from play as the initial setting.

5. The method according to claim 1 ,
wherein
the sensor is at least designed or arranged at the nozzle assembly in such a way that the right-hand and left-hand edge region of the melt is monitored by means of the sensor and is controlled or regulated in such a way that the respective edge region is set by adjusting the adjusting elements depending on at least the material or quality criteria or a conveying speed.

6. The method according to claim 1 ,
wherein
at least one clamping blade is respectively arranged in a right-hand and left-hand edge region of the nozzle assembly, wherein the width of the nozzle discharge slot can be variably set, wherein the method comprises the following steps, which are carried out automatically for adjusting the width of the nozzle discharge slot and for clamping the adjusting elements:
unclamping the clamping blade within the nozzle discharge slot;
displacing the clamping blade within the nozzle discharge slot; and
clamping the clamping blade within the nozzle discharge slot for fixing individual adjusting elements.

Assignees

• Windmoeller & Hoelscher

Inventors

• Colell Waldemar
• Groepper Bernd-Alexander
• Schmitz Torsten
• Faustmann Daniel

Classifications

• B05B1/32

  in which a valve member forms part of the outlet opening {(B05B1/3033 takes precedence)} · CPC title

• B05B1/044

  Slits, e.g. narrow openings defined by two straight and parallel lips; Elongated outlets for producing very wide discharges, e.g. fluid curtains (B05B1/046 takes precedence) · CPC title

• B29C2948/92904

  Die; Nozzle zone · CPC title

• B29C2948/92447

  Moulded article · CPC title

• B29C48/08

  flexible, e.g. films · CPC title