Method for bonding using adhesive layers with the aid of a laser

Patent metadata

Field	Value
Publication number	US-2016333154-A1
Application number	US-201615223793-A
Country	US
Kind code	A1
Filing date	Jul 29, 2016
Priority date	Jan 31, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

The invention relates to a method and a device for bonding two substrates, wherein an adhesive is applied to a first substrate and a second film-type substrate consisting of a thermoplastic material is converted into a plasticized state by heating before being bonded to the first substrate.

First claim

What is claimed is:

1 . A method for bonding two substrates, wherein an adhesive is applied to a first substrate, a second film substrate consisting of a thermoplastic material is transported in a feed direction and converted into a plasticized state by heating with electromagnetic radiation in the form of a laser beam, wherein the laser beam is guided over the second substrate at an angle with regard to the feed direction, and wherein the side of the first substrate which is coated with adhesive is bonded to the side of the second substrate which is irradiated by the laser beam.

2 . The method according to claim 1 , wherein the laser beam is deflected by means of a polygonal mirror which is rotatably mounted about an axis of rotation, if necessary focused before and/or subsequently by focusing means, and the focused laser beam is guided along a line over the second substrate.

3 . The method according to claim 1 , wherein the two substrates are bonded continuously, wherein the laser beam is guided over the second substrate and matched to the feed speed in so that the time between impingement of the laser beam and the subsequent bonding is substantially the same for each point of the surface of the second substrate to be bonded.

4 . The method according to claim 1 , wherein the laser beam is guided over the second substrate substantially linearly and/or substantially orthogonally to the feed direction.

5 . The method according to claim 1 , wherein the laser beam is a laser beam with IR radiation in the wavelength range from 0.8 to 25 μm.

6 . A device for bonding a first substrate to a second film substrate consisting of a thermoplastic material, having
an applicator device for applying an adhesive to the first substrate; at least one feed device for transporting at least the second substrate in a feed direction; a heating device for heating the surface of the second substrate which is bonded to the first substrate, wherein the heating device is designed and is arranged in such a way that the second substrate can be converted into a plasticized state by heating, wherein the heating device has a laser which emits electromagnetic radiation in the form of a laser beam as a heat source, and wherein the laser beam is guided for heating the second substrate in such a way that its projection on the surface is moved in a relative movement with regard to the surface in a projection movement direction, wherein the projection movement direction is provided at least temporarily at an angle to the feed direction in order to enable heating of the second substrate when the second substrate moves in the feed direction before the two substrates are bonded, and a pressing device for pressing the two substrates after heating the second substrate.

7 . The device according to claim 6 , wherein a beam guide unit, which deflects the laser beam and can guide the projection over the surface, is provided.

8 . The device according to claim 6 , wherein a rotatably mounted polygonal mirror for deflecting the laser beam is provided to guide the projection over the surface for the purpose of heating.

9 . The device according to claim 6 , wherein a focusing device with focusing means is provided in order to focus the laser beam ( 17 ).

10 . The device according to claim 6 , wherein the laser emits IR radiation in the wavelength range from 0.8 to 25 μm.

11 . A method for bonding substrates, comprising:
providing a first material having a first planar surface; applying adhesive to the first material first surface to provide a first material adhesive coated first surface; moving the first material in a feed direction; providing a second material having a first planar surface, the second material being a flexible thermoplastic film material having a plasticizing temperature; irradiating the second material first surface with a laser beam to heat at least a portion of the second material first surface to about the plasticizing temperature to form a second material plasticized first surface; moving the second material in the feed direction; and contacting the adhesive coated first surface and the plasticized first surface to bond the first material to the second material.

12 . The method of claim 11 , wherein the step of irradiating the second material first surface with a laser beam occurs while moving the second material in the feed direction.

13 . The method of claim 11 , wherein the step of applying adhesive to the first material first surface to provide an adhesive coated first surface occurs while moving the first material in the feed direction.

14 . The method of claim 11 , wherein the steps of irradiating the second material first surface with a laser beam and contacting the adhesive coated first surface and the plasticized first surface both occur while both the first material and the second material are each moving in the feed direction.

15 . The method of claim 11 , wherein the step of irradiating the second material first surface with a laser beam heats at least a portion of the second material first surface to a temperature in the range of 40° C. below the plasticizing temperature to 40° C. above the plasticizing temperature.

16 . The method of claim 11 , wherein the step of contacting the adhesive coated first surface and the plasticized first surface to bond the first material to the second material further comprises pressing the adhesive coated first surface and the plasticized first surface into contact with each other.

Assignees

• Henkel Ag & Co Kgaa
• Trumpf Laser & Systemtechnik Gmbh

Inventors

• Kinzelmann Hans-Georg
• Blodau Marcel
• Sauter Martin
• Berger Michael

Classifications

• C08J5/128

  Adhesives without diluent · CPC title

• B29C65/7894

  of continuously moving sheets or webs · CPC title

• B29C66/91216

  enabling contactless temperature measurements, e.g. using a pyrometer · CPC title

• B29C65/1632

  direct heating the surfaces to be joined · CPC title

• B29C66/1122

  Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence) · CPC title