WO2002079554A2

WO2002079554A2 - Method for producing woven fabric

Info

Publication number: WO2002079554A2
Application number: PCT/EP2002/003630
Authority: WO
Inventors: Johann Berger
Original assignee: Berger Seiba-Technotex Verwaltungs Gmbh & Co.
Priority date: 2001-03-30
Filing date: 2002-04-02
Publication date: 2002-10-10
Also published as: CZ302560B6; CA2442653A1; PL367699A1; EP1415028A2; PT1415028E; CN1520476A; ES2302804T3; DE10115891A1; WO2002079554A3; EP1415028B1; JP2005503491A; AU2002254970A1; DE50211790D1; CA2442653C; CZ20032628A3; ATE387524T1; JP4439182B2

Abstract

The invention relates to a method for weaving single-layered and/or multi-layered woven fabric, especially airbag fabric. The inventive method is characterised in that warp threads delivered by at least two warp beams (8, 10) are interwoven.

Description

Process for making fabrics

Process for weaving fabrics, in particular airbag fabrics.

In conventional methods for weaving fabrics, different warp threads are incorporated into the warp threads after a change of weave to create loose warp threads, which have a disadvantageous effect on fabric permeability and appearance. In addition, manufacturing processes for weaving double fabrics from a warp sheet supplied by only one warp beam are known, in which, inter alia, Due to the geometry, tension differences between the upper and lower tissues can occur, which are disadvantageous insofar as the physical properties differ between the upper and lower tissues. However, since in the manufacture of fabrics and in particular in the manufacture of airbag fabrics, that is to say safety parts, great importance must be attached to the process reliability of the physical properties within airbags which are made from the corresponding fabrics, these differences between the upper and lower fabric layer to be classified as extremely critical. This is particularly true when the fabrics are used uncoated. In the uncoated area, the uniformity of the physical properties of the various fabric layers is of paramount importance, since the uniformity of defined air permeability significantly influences the function of an airbag.

In addition, the conventional methods are also to be criticized for other reasons. For example, the combination of the warp thread group on the warp beam results in disadvantages in warp production, since in the sizing process the complete thread covering of each thread with sizing cannot be guaranteed due to the high thread occupancy on the warp beam. The size is applied to the warp thread around the To make warp threads in the sizing process more resistant for the weaving process. Correspondingly, if the thread is not completely coated with size, there are enormous losses in quality due to errors caused thereby, such as capillary breaks, deferred lint nests, thread breaks. These errors could be avoided with sufficient and evenly applied sizing. It can also happen in the sizing process that, due to the high thread occupancy per warp beam, several threads stick together over a larger warp distance. These bonds also lead to the quality losses mentioned in the later weaving mill.

In the so-called rear compartment of the weaving machine, the thread density is very high, particularly when producing two- or multi-layer fabrics from only one warp beam. Even under the condition of a theoretically optimal arbitration, the tightness in the back compartment can lead to the mentioned weaving and quality losses.

The invention is based on the object of proposing a method for weaving fabrics, in particular airbag fabrics, in which the disadvantages known from the prior art are avoided or at least greatly reduced.

The object is achieved with a method according to claim 1. If the total warp thread set required for a fabric is distributed over at least two warp beams, it is much better to use sized warp thread material than with conventional methods. In the warp production to be carried out before the process according to the invention, a complete sheathing of the individual threads during sizing can then take place with a double warp spacing, as it were, due to the reduced total number of warp threads per warp beam. Due to the reduced thread occupancy per warp beam possible by the method according to the invention, the risk of individual warp threads sticking together is also reduced to a minimum, whereby both glued warp threads and fluffy warp threads (broken capillaries due to inadequate size coating) are almost avoided. The error rate in weaving can be drastically reduced.

The method according to the invention also has further advantages, in particular if, in multilayer fabrics, for example two-layer fabrics, each fabric layer can be produced separately with a warp thread array of its own warp beam. This achieves a tension equalization across the fabric width, which is comparable to the production of standard single-layer flat fabrics. The process according to the invention can therefore achieve the required, very high tissue quality and in the individual Fabric layers achieve almost identical technical values. In addition, the described procedure minimizes tension differences during the transition from a single-layer P3 / 3 area to a two-layer weave.

In an advantageous development of the method according to the invention, the warp beams are controlled independently of one another on the voltage side. In the case of two-layer fabrics in particular, this leads to a further increase in the uniformity of the fabrics.

In another advantageous development of the method according to the invention, the warp beams are equipped with different warp thread materials. If such a fabric is to be used, for example, for a side airbag in a car, then a warp thread material can be selected for the position of the fabric (in the installed state in the car) facing the passenger, which results in an airbag surface that is gentle on the head of the passenger. The other layer of the fabric facing the window can contain a warp thread material that is particularly resistant to broken glass or the like. This further development of the invention also gives the possibility of using materials of different quality and price range for the warp threads of the two layers, whereby on the "Head side" to protect the passenger higher quality or particularly useful (possibly finer) materials are used, whereas rough, cheaper materials are used on the "window side". This can also reduce manufacturing costs. Depending on requirements, warp threads of different strength, texture, elasticity, fineness or material properties can be used in the two or more layers. It is also conceivable to use elastic warp threads on one warp beam and inelastic warp threads on another warp beam. The advantages of this procedure are very numerous.

To illustrate the method according to the invention, this is briefly described by way of example using a schematic drawing.

The figure shows a very schematic representation of an arrangement of a weaving machine from the side. Warp thread assemblies 9 are delivered to the weaving point from warp beams 8 and 10, the rear shed 6 and the shed 3 being formed in the area of a harness package 5 of a (stylized) jacquard machine 7 due to the up and down movements of the individual warp threads. The reed 4 can be seen in the area of the left end of the shed 3. From here, a and / or multilayer fabric 2 is wound up by a goods take-off roller 1. The use of two or more warp beams according to the invention when weaving single and / or multi-layer fabrics also brings a considerable cost advantage. The use of melter warp beams reduces the frequency of warp changes and the set-up times.

Claims

1. A method for weaving single and / or multilayer fabrics, in particular airbag fabrics, characterized in that warp threads supplied by at least two warp beams (8, 10) are woven.

2. The method according to claim 1, characterized in that the warp beams (8, 10) are controlled independently of one another on the voltage side.

3. The method according to claim 1 or 2, characterized in that the warp beams (8, 10) are equipped with different warp thread materials.

4. The method according to claim 1, 2 or 3, characterized in that it is carried out on a loom equipped with a jacquard machine.

5. loom, in particular for performing the method according to any one of the preceding claims, characterized in that it has at least two warp beams (8, 10).