Device for pneumatically conveying and guiding a multifilament thread

Patent metadata

Field	Value
Publication number	US-2016002830-A1
Application number	US-201414770672-A
Country	US
Kind code	A1
Filing date	Feb 17, 2014
Priority date	Feb 28, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A device for pneumatically conveying and guiding a multifilament thread has a closed conveying channel which has a thread inlet opening at one end and a thread outlet opening at the opposite end. An injector zone having at least one compressed air channel which opens into the conveying channel is formed between the thread inlet opening and the thread outlet opening, wherein the compressed air channel can be connected to a compressed air source. In order to avoid blowing air from flowing back from the injector zone at the thread inlet opening, a return flow channel is formed in a channel section of the conveying channel between the thread inlet opening and the opening of the compressed air channel, which return flow channel connects the conveying channel to ambient atmosphere.

First claim

1 . A device for pneumatically conveying and guiding a multifilament synthetic thread by way of a closed conveying duct which at one end has a thread inlet opening and at the opposite end has a thread outlet opening and which between the thread inlet opening and the thread outlet opening has an injector zone having at least one compressed-air duct which opens into the conveying duct, wherein the compressed-air duct is connectable to a compressed-air source, and wherein a return stream duct opens into a duct portion of the conveying duct, between the thread inlet opening and a mouth of the compressed-air duct, the return stream duct connecting the conveying duct to an ambient atmosphere.

2 . The device as claimed in claim 1 , wherein the return stream duct opens out having an inclination in a conveying direction of the conveying duct.

3 . The device as claimed in claim 2 , wherein the inclination of the return stream duct is defined by an angle in the range of 5° to 40° between the return stream duct and the duct portion of the conveying duct between the thread inlet opening and the mouth of the compressed-air duct.

4 . The device as claimed in claim 2 , wherein the return stream duct and the conveying duct in a mouth region form a transition face which is rounded in a stream direction.

5 . The device as claimed in claim 1 4 , wherein the return stream duct has a duct cross section which is larger than a duct cross section of the conveying duct in the mouth region of the return stream duct.

6 . The device as claimed in claim 1 , wherein an inflow duct opens into the duct portion of the conveying duct in the region of the mouth of the return stream duct, and wherein the inflow duct connects the conveying duct to an ambient atmosphere.

7 . The device as claimed in claim 6 , wherein a mouth of the inflow duct has an opening cross section which is smaller than the mouth of the return stream duct, which is configured so as to be opposite.

8 . The device as claimed in claim 6 , wherein the inflow duct in the mouth region encloses an angle in the range of 80° to 100° with the conveying duct.

9 . The device as claimed in claim 1 , wherein the conveying duct by way of the thread outlet opening opens into a stuffer box, by way of which the thread is compressible to a thread plug.

Assignees

• Oerlikon Textile Gmbh & Co Kg

Inventors

• Stündl Mathias

Classifications

• B65H51/16

  Devices for entraining material by flow of liquids or gases, e.g. air-blast devices (blowing slag wool in molten state C03B37/06) · CPC title

• B65H2701/313

  Synthetic polymer threads · CPC title

• D02J1/08

  Interlacing constituent filaments without breakage thereof, e.g. by use of turbulent air streams · CPC title

• D02G1/122 Primary

  introducing the filaments in the stuffer box by means of a fluid jet · CPC title

• D02G1/161

  yarn crimping air jets · CPC title