CN108407273B

CN108407273B - Thermoplastic film pasting method for device with three-dimensional curved surface

Info

Publication number: CN108407273B
Application number: CN201810321668.4A
Authority: CN
Inventors: 张一凡; 涂晋益
Original assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Current assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Priority date: 2018-04-11
Filing date: 2018-04-11
Publication date: 2020-06-16
Anticipated expiration: 2038-04-11
Also published as: CN108407273A; TW201943610A; TWI658968B

Abstract

The invention provides a thermoplastic film pasting method for a device with a three-dimensional curved surface, which is used for carrying out technical research on appearance design before cutting of the device, utilizing the thermoplastic limit of a film material to form a device pasting film with a large curved surface and being also applied to an irregular three-dimensional curved surface.

Description

Thermoplastic film pasting method for device with three-dimensional curved surface

Technical Field

The present invention relates to the field of touch control, and more particularly, to a thermoplastic film-pasting technique for a device with a three-dimensional structure with a large curvature.

Background

The laminating technology of the touch module gradually evolves from the first plane laminating to laminating on a one-dimensional curved surface and laminating on a two-dimensional curved surface. Finally, the film can be pasted on the larger curved surface by using the technology of outer surface decoration (OMD) of the mold.

The touch module is generally applied as a two-dimensional or three-dimensional film at room temperature, and under special conditions, thermosetting optical adhesive (OCA) is required to be applied as a hot-pressing film. Because two-dimensional or three-dimensional devices with larger curvature need to be used as touch modules in the current market, the laminating application of optical films or other materials inherently needs a thermoplastic molding mode film pasting.

Disclosure of Invention

The invention provides a thermoplastic film pasting method for a device with a three-dimensional curved surface, which comprises the following steps: a. the device comprises a heating device and a clamp, wherein the heating device is used for heating the film to soften the film, and the clamp is used for fixing the film and can execute a pressing action to enable the film to be attached to the device. b. The film is fixed by the fixture. c. The film is heated by the heating device. d. The mold is disposed in the working space with the recess facing the film. e. The device is placed in the groove with the three-dimensional curved surface facing the film. f. The fixture performs the pressing action to make the film fit with the three-dimensional curved surface.

The invention provides a thermoplastic film pasting method for a device with a three-dimensional curved surface, which is used for carrying out technical research on appearance design before cutting of the device, comprises material characteristics, stress distribution, thickness variation and specification and quality of a final finished product, utilizes the thermoplastic limit of a film material to form a device pasting film with a large curved surface, and can be applied to an irregular three-dimensional curved surface.

Drawings

FIG. 1 is a flow chart of a method of thermoplastic film application for a device having a three-dimensional curved surface according to a preferred embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a mold and a device according to a preferred embodiment of the method for thermoplastic film application of a device with a three-dimensional curved surface of the present invention.

FIG. 3 is a cross-sectional view of a mold and a device according to a preferred embodiment of the method for thermoplastic film application of a device with a three-dimensional curved surface of the present invention.

FIG. 4A is a first process diagram illustrating a thermoplastic film-coating method for a device with a three-dimensional curved surface according to a preferred embodiment of the present invention.

FIG. 4B is a second process diagram illustrating a thermoplastic film-coating method for a device with a three-dimensional curved surface according to a preferred embodiment of the present invention.

FIG. 4C is a third schematic view of a preferred embodiment of a method for thermoplastic film application of a device having a three-dimensional curved surface according to the present invention.

FIG. 4D is a fourth process diagram illustrating a thermoplastic film-coating method for a device with a three-dimensional curved surface according to a preferred embodiment of the present invention.

Reference numerals:

film 1

Thermoplastic laminating machine 2

Work space 21

Heating device 22

Clamp 23

Mold 3

Groove 31

Device 4

Three-dimensional curved surface 41

Central region 411

Curved surface region 412

Edge region 413

Pressing action 91

Laser cutting operation 92

Steps 100 to 160

Center point A

Edge point B

Fulcrum C

Height H

Width D

Detailed Description

The technical means and structure adopted by the present invention are described in detail with reference to the following embodiments for better understanding, but it should be noted that the contents do not limit the present invention.

Fig. 1, fig. 2, fig. 3, fig. 4A, fig. 4B, fig. 4C and fig. 4D are a flowchart of a method, a cross-sectional view of a mold and a device, a schematic view of a first schematic view, a schematic view of a second schematic view and a schematic view of a first to a fourth schematic view of a thermoplastic film-pasting method for a device with a three-dimensional curved surface according to a preferred embodiment of the present invention. The invention relates to a thermoplastic film sticking method with a three-dimensional curved surface, which comprises the following steps:

step 100: providing a film 1, a thermoplastic laminating machine 2, a mold 3 and a device 4, wherein the mold 3 is provided with a groove 31 for accommodating the device 4, the device 4 is provided with a three-dimensional curved surface 41, and the thermoplastic laminating machine 2 is used for thermoplastic laminating the film 1 and the device 4. In one embodiment, the film 1 may be a polymer film, a metal oxide film or a nanosol film.

Referring to fig. 4A to 4C, the thermoplastic coating machine 2 has a working space 21 therein, and the thermoplastic coating process can be performed in the working space 21. The thermoplastic laminating machine 2 comprises a heating device 22 and a clamp 23, wherein the heating device 22 can heat the film 1 to a proper temperature to soften the film 1 for subsequent laminating operation. The fixture 23 is used to fix the film 1 and perform a pressing operation 91 to attach the film 1 to the device 4. In the present embodiment, the three-dimensional curved surface 41 is a concave surface, but is not limited thereto, and it may also be a convex surface or an irregular curved surface.

Step 110: the thermoplastic laminating machine 2 fixes the film 1 by the jig 23.

Step 120: the thermoplastic laminating machine 2 heats the film 1 to a proper temperature by the heating device 22. The appropriate temperature can soften the surface of the film 1 without affecting the structural properties of the film 1 itself.

Step 130: the mold 3 is placed in the working space 21 with the recess 31 facing the film 1. Referring to fig. 4A, the fixture 23 can fix the film 1 and heat the film 1 to a suitable temperature by the heating device 22, the mold 3 is disposed right below the film 1 with the concave groove 31 facing the film 1, and the concave groove 31 can assist the thermoplastic laminating machine 2 in thermoplastic laminating the film 1.

Step 140: the device 4 is placed in the recess 31 with the three-dimensional curved surface 41 facing the film 1.

Step 141: the thermoplastic laminating machine 2 fixes the mold 3. Referring to fig. 4B, the position of the mold 3 is fixed to ensure stability during the pressing operation 91.

Step 150: the fixture 23 performs the pressing operation 91 to attach the film 1 to the three-dimensional curved surface 41. Referring to fig. 4C, the film 1 is bonded to the three-dimensional curved surface 41 by high pressure bonding (e.g., Compressed Dry Air (CDA)).

In an embodiment of the present invention, the step 150 further includes: the three-dimensional curved surface 41 defines a central region 411, a curved region 412 and an edge region 413 from the center to the edge of the three-dimensional curved surface 41, and the pressing operation 91 sequentially attaches the film 1 to the three-dimensional curved surface 41 from the central region 411, the curved region 412 to the edge region 413.

Referring to fig. 2 and 3, the edge of the device 4 has a height H and a width D from the edge of the groove 31, so as to avoid the risk of air bubbles between the three-dimensional curved surface 41 and the film 1 in the thermoplastic film, the thermoplastic angle can be greater than 1.6 of the device design angle, and thus the device design angle can meet the requirement of the thermoplastic angle by controlling the height H and the width D, in this embodiment, the center of the central region 411 defines a center point a, the edge region 413 defines an edge point B, the edge of the groove 31 defines a support point C, the connecting direction of the center point a and the edge point B has a first angle α with the horizontal direction, the connecting direction of the center point a and the support point C has a second angle β with the horizontal direction, the second angle β is greater than 1.6 of the first angle α.6 of the three-dimensional curved surface 41, the horizontal distance between the center point a and the edge point B is 25.4 mm (mm), it can be seen from fig. 3 that the horizontal distance between the center point a of the three-edge point 41 a and the support point B is greater than the ideal angle of the groove 4.6, and the horizontal angle between the groove 31.6, the groove design angle can be calculated as the distance between the groove 10.6 mm, the horizontal angle between the groove angle between the center point C and the center point 31.6 mm, the horizontal angle between the center point 3.6 mm, the groove 31.6 mm, the groove 10 mm, the groove angle between the groove 4 mm, the groove angle between the center point C is equal to the horizontal angle between the groove 10 mm.

The pressing sequence can predict the probability of bubble generation of the three-dimensional curved surface film, and the pressing sequence can be effectively controlled by designing the size of the groove 31. In one embodiment, the film is sequentially extended from the central region 411 to the curved region 412 and the edge region 413. By controlling the width and height of the groove 31, the problems of optical abnormality and the like caused by excessive stretching amount of the film 1 in the attaching process can be avoided.

Step 160: a laser cutting operation 92 is performed to make the film 1 and the edge of the three-dimensional curved surface 41 be aligned. Referring to FIG. 4D, after the pressing operation 91 is completed, the film 1 can be aligned with the edge of the three-dimensional curved surface 41 by using a laser cutting technique.

Through the above detailed description, it is fully evident that the objects and effects of the present invention are advanced by practice, and have industrial applicability, and are fully in line with the patent requirements of the invention and the appended claims. It will be appreciated by those skilled in the art that many modifications, variations, and equivalents may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A thermoplastic film pasting method for a device with a three-dimensional curved surface is characterized by comprising the following steps:

a. providing a film, a thermoplastic laminating machine, a mold and a device, wherein the mold is provided with a groove for accommodating the device, the device is provided with a three-dimensional curved surface, a working space is arranged in the thermoplastic laminating machine and is used for thermoplastic laminating the film and the device, the thermoplastic laminating machine comprises a heating device and a clamp, the heating device is used for heating the film to soften the film, the clamp is used for fixing the film and can execute a pressing action to laminate the film and the device;

b. fixing the film by using the clamp;

c. heating the film by the heating device;

d. arranging the mold in the working space, and enabling the groove to face the thin film;

e. placing the device in the groove, and enabling the three-dimensional curved surface to face the thin film;

f. the fixture carries out the pressing action to enable the film to be attached to the three-dimensional curved surface, the three-dimensional curved surface is defined to be provided with a central area, a curved surface area and an edge area from the center of the three-dimensional curved surface to the edge, the pressing action is carried out from the central area, the curved surface area to the edge area in sequence to attach the film to the three-dimensional curved surface, the center of the central area is defined to be provided with a central point, the edge area is defined to be provided with an edge point, the edge of the groove is defined to be provided with a fulcrum, a first included angle is formed between the connecting line direction of the central point and the edge point and the horizontal direction, a second included angle is formed between the connecting line direction of the central point and the fulcrum and the horizontal direction, and the second included angle is larger than 1.6 times of.

2. A method of thermoplastic film application for a device having a three-dimensional curved surface according to claim 1, wherein said step f. is followed by the steps of:

g. performing a laser cutting operation to make the film and the edge of the three-dimensional curved surface aligned.

3. A method for thermoplastic film application to a device having a three-dimensional curved surface according to claim 1, wherein said step e.further comprises the following steps:

e1. the thermoplastic laminating machine holds the mold.