DE19719282C2 - Process for producing a connection between two material webs - Google Patents

Description

The invention relates to a method for producing a connection between two materials tracks according to the preamble of claim 1 and claim 2, and a Welded connection according to the preamble of claim 12.

The creation of permanent connections between two material webs, de NEN at least one is not or only partially weldable, is usually done with the help an adhesive. Due to unclean surfaces before gluing the two Material webs significantly affect the quality of the connection. Aging further the adhesives, so that the connection loosens over time.

From DE-PS 11 44 097 it is known to take a thread with thermoplastics Use heat and pressure to form seams. The thread is di right when welding, applied according to liquid solder or adhesive. The at least partially liquefied material of the thread is distributed between the connecting parts with wetting of the surface. This method is disadvantageous the strength of the connection of the material webs produced with this method.

DD 231 484 A1 discloses a method for connecting two material webs threads directly woven into the material web. A suitable one for this procedure Thread is disclosed by DE 30 24 049 A1. The disadvantage of this connection is that only connections running in the thread direction are possible.  

From DE-OS 18 04 988 is a method for connecting two weldable Ma material webs known, but for this, both material webs must ver from each other weldable materials. This limits the areas of application of such measures material webs strongly.

The object of the present invention is therefore to combine two To provide material webs made of any materials that are easy on them che way with sufficient strength.

This object is achieved by a method having the features of claim 1 or Claim 2, and by a welded connection of two material webs with the Features of claim 12 solved.

The method according to the invention provides for the establishment of a connection between two Material webs, of which at least one material web is not or only be there is weldable material, before that each is not or only partially weldable Material web at the point where the weld seam will later run with a seam hen. The thread consists at least partially of a weldable material.

To produce the welded connection, the material webs are stacked on one another in this way positioned so that the seams are on top of each other. If there is a welded connection between a weldable and a non or only partially weldable material web the seam can be positioned as desired. Following the posi welding. This is the preferred welding method High frequency, pulse and heat pulse welding in question. Furthermore, the press welding, heating element welding or source welding possible. This list However, the process is not final.  

As a result of the effects of temperature and / or pressure, the thermo melts plastic. Due to the pressure, the contact surface of the individual thread sections or the thread enlarged with the material web, the thermopla Plastic plastics merge and form a cohesive Ver binding. The connection does not come off even at individual points on the seams the threads are cut through wear, for example.

Compared to a pure seam connection, the weld connection has the advantage that the holes created by the sewing in the material webs due to the Welding process are at least partially closed with the material of the thread. In addition, the holes of the two seams are usually not on top of each other, so that none Light can penetrate through the welded material webs.

The thread can either consist entirely of a weldable material or have a casing made of a weldable material. The use of a Sheathing made of a weldable material enables the combination under various properties, in particular the weldability of the casing combine with a high tensile strength of the thread core.

It is particularly advantageous to use a thermoplastic as a thread, because such materials are particularly well suited for welding.

A thread made of polyester or PVC is preferably used, since such a thread can be welded well on the one hand and on the other hand has sufficient strength points to hold the two material webs together securely. A thread can also be used easy to process from polyester or PVC and is also inexpensive.  

A particularly tear-proof and secure connection can be made with a jacketed Fiber with a core of one or more particularly tear-resistant fibers, e.g. glass fiber manufacture ser.

The threads preferably have a diameter between 0.1 mm and 2.0 mm. Derar threads can be easily sewn with appropriate industrial sewing machines. However, the thread thickness also depends on the thickness of the material web and the required Chen resilience of the welded joint.

A particularly secure connection is achieved in that the seam on the individual surface to be welded diagonally to the longitudinal extent of the seam and parallel to one another other stitches. In particular, there is an angle α of 45 ° to Suitable for longitudinal extension of the seam.

Especially in connection with a second seam, which is welded to the first seam and which is designed according to the first seam can be a particularly secure Welded connection can be achieved. There is a relatively large tolerance in positioning possible, but requires wide seams or several seams next to each other. In the Positioning must be ensured that the individual stitches of the ones to be welded Cross seams.

High-frequency welding and ultrasonic welding are particularly suitable as welding processes designated essen, or suitable for pulse welding.

The present invention is explained below using an exemplary embodiment Reference to the accompanying drawings explained in more detail. Show it:

Fig. 1 is a seamed material web,

Fig. 2 shows a section through a thread,

Fig. 3 shows a section through two prepositioned material webs, and

Fig. 4 shows a section through a finished weld.

Fig. 1 shows a material web 1 , which is provided with a seam 2 . The material web 1 consists of a glass fiber fabric 4 , which is provided with a coating 5 made of silicone 6 . The individual stitches 8 of the seam 2 run parallel to one another and at an angle α of 45 ° to the longitudinal extent of the seam 2 . The seam 2 has a width B of 1 cm. The thread 10 forming the seam 2 consists in the core 12 of a glass fiber. This core 12 is coated with polyester 14 (see Fig. 2).

Fig. 3 shows a section across the seam 2 provided with the material web 1. On this web of material 1, a second web of material 'is pre-positioned, which also with a suture 2' 1 is provided which corresponds to the seam. 2

For the actual welding process, a high-frequency tool, which is connected to a sonotrode, is arranged over the seam 2 'of the material web 1 ', and an abutment is arranged under the seam 2 'of the material web 1 . The material webs 1 and 1 'are pressed together between the high-frequency tool and the abutment. With the aid of the ultrasound, which is emitted by the high-frequency tool due to the excitation by the sunrode, the threads 10 , 10 'forming the seams 2 and 2 ' are heated until they are plastically deformable. As a result of the pressure that is exerted on the material webs 1 and 1 ', the threads 10 , 10 ' deform at the points where they touch and where the highest pressure prevails. These are the places where the threads 10 of the two seams 2 , 2 'cross. At these points, the two threads 10 , 10 'fuse together, so that there is a material connection, as shown in Fig. 4.

Reference list

1

Material web

1

'' Material web

2nd

seam

2nd

'Seam

4th

Fiberglass fabric

5

Coating

6

PTFE

8th

Stitches

10th

thread

10th

'Thread

12th

Fiberglass core

14

polyester
α angle

Claims (13)

1. A method for producing a connection between two material webs ( 1 , 1 '), wherein at least one material web ( 1 , 1 ') consists of a non or only partially weldable material, characterized in that

• a) each material web ( 1 , 1 ') that cannot be welded or can only be welded to a limited extent is provided with a seam ( 2 , 2 ') at the point at which the weld seam later runs,
• b) is used as thread (10, 10 ') for the seam (2, 2') has a thread (10, 10 '), which consists at least partly of a weldable material,
• c) the material webs ( 1 , 1 ') are positioned one on top of the other in such a way that the seams ( 2 , 2 ') lie on one another, and
• d) the threads ( 10 , 10 ') are welded together.

2. A method for producing a connection between two material webs ( 1 , 1 '), wherein a material web ( 1 , 1 ') consists of a material which cannot be welded or can only be welded to a limited extent, characterized in that

• a) each material web ( 1 , 1 ') that cannot be welded or can only be welded to a limited extent is provided with a seam ( 2 , 2 ') at the point at which the weld seam later runs,
• b) is used as thread (10, 10 ') for the seam (2, 2') has a thread (10, 10 '), which consists at least partly of a weldable material,
• c)) terialbahn with the seam (2, 2 ') provided with the material web (1, 1' on the weldable Ma (1, 1 ') is positioned and
• d) the thread ( 10 , 10 ') is welded to the weldable material web ( 1 , 1 ').

3. A method for producing a connection according to one of the preceding claims, characterized in that the thread ( 10 , 10 ') consists entirely of a weldable material or that the thread ( 10 , 10 ') has a sheath made of a weldable material . 4. A process for producing a connection according to one of the preceding claims, characterized in that the thread ( 10 , 10 ') consists of a thermoplastic. 5. A process for producing a connection according to one of the preceding claims, characterized in that the thread ( 10 , 10 ') consists of polyester ( 14 ) or PVC. 6. A method for producing a connection according to one of the preceding claims, characterized in that the thread ( 10 , 10 ') has a core ( 12 ) made of one or more glass fibers. 7. A method for producing a connection according to one of the preceding claims, characterized in that the thread ( 10 , 10 ') has a diameter between 0.1 mm and 2.0 mm. 8. A method for producing a connection according to one of the preceding claims, characterized in that the seam ( 2 , 2 ') individual, on the surface to be welded obliquely to the longitudinal extent of the seam ( 2 , 2 ') and parallel stitches ( 8 ). 9. A method for producing a connection according to one of the preceding claims, characterized in that the individual stitches ( 8 ) of the seam ( 2 , 2 ') have an angle α of 45 ° to the longitudinal extent of the seam ( 2 , 2 '). 10. A method for producing a connection according to one of the preceding claims, characterized in that the individual stitches ( 8 ) of two superimposed seams ( 2 , 2 ') cross. 11. A method for producing a compound according to one of the preceding Claims, characterized in that the high-frequency or pulse welding is used. 12. Welded connection of two material webs ( 1 , 1 '), characterized in that threads ( 10 , 10 ') are provided as welding aids on at least one material web ( 1 , 1 ') that cannot be welded, which seam ( 2 , 2 ') and that the threads ( 10 , 10 ') of the seam ( 2 , 2 ') with threads ( 10 , 10 ') of the seam ( 2 , 2 ') associated with this seam ( 2 , 2 ') or with a weldable material web ( 1 , 1 ') are welded. 13. Welded connection according to claim 12, characterized in that the threads ( 10 , 10 ') in at least one material web ( 1 , 1 ') in the form of a seam ( 2 , 2 ') are provided, the individual stitches ( 8 ) Seam ( 2 , 2 ') are arranged parallel to one another and obliquely to the longitudinal extent of the seam ( 2 , 2 ').