WO2020177780A2

WO2020177780A2 - Composite prism light guide film production apparatus

Info

Publication number: WO2020177780A2
Application number: PCT/CN2020/095400
Authority: WO
Inventors: 刘勇; 李永刚
Original assignee: 南京贝迪电子有限公司
Priority date: 2019-09-16
Filing date: 2020-06-10
Publication date: 2020-09-10
Also published as: JP3231392U; CN211000058U; WO2020177780A3; DE212020000091U1

Abstract

Provided is a composite prism light guide film production apparatus, relating to the technical field of thin film production. A prism web is provided between two punches; a rolling shaft set is used to adhere the raw material outputted from the two punches to the prism web separately from two sides; a transfer printing structure on the surface of the rolling shaft set is used to press designed dots onto the composite prism light guide film on the side away from the prism web. The structure is simple, and the production efficiency is high. A prism web is directly adhered to and a dot structure is provided on the surface of a light guide film, thereby forming integrally a composite prism light guide film, thus substantially enhancing the optical condensation performance of the prism light guide film product. A metallic shaping roller is used to shape the molded composite prism light guide film. The stress in the film is removed, and the warping caused by the singular cylindrical rolling shaft is avoided, enhancing the quality of the produced composite prism light guide film product.

Description

Compound prism light guide film production device

Technical field

This application relates to the technical field of thin film production, in particular to a composite prism light guide film production device.

Background technique

The prism light guide film is an important part of the backlight module and is a kind of optical film. Usually, a small prism unit is arranged on one side of a transparent material and a coating is arranged on the other side, which has the effect of improving brightness. Because the prism film has excellent light-gathering performance, it can change the direction of light and greatly improve the front brightness of the backlight module. The front brightness of the backlight module using two orthogonal prism films will increase by more than 100%. Because the brightness of the backlight module is provided by the lamp beads arranged on the back or on both sides or the lamp bar with multiple lamp beads, the same brightness can be achieved. When the prism film is used, the use of lamp beads can be reduced, thereby Energy saving.

The prior art prism light guide film production equipment basically uses a single material, generally after injection molding into a common light guide film, then prism attachment and dot design are carried out, and finally the prism light guide film is made. The preparation process is carried out separately. The multiple processes of the prism cannot be formed in one piece; for the more complex composite prism light guide film, the production process and steps are more complicated, which greatly increases the production time and cost of the prism light guide film.

Summary of the invention

The purpose of this application is to provide a composite prism light guide film production device. During the molding process of the composite prism light guide film, prisms are directly arranged in the light guide film and dots are designed on both sides of the light guide film to integrally form the composite prism light guide film , The processing speed is fast, the production efficiency and production cost are significantly reduced.

In order to achieve the above objective, this application proposes the following technical solution: a composite prism light guide film production device, including a first feed port, a first melting and stirring zone, a first punch, a second feed port, and a second melting Stirring zone, second punching head, prism discharge device, coating device, rolling shaft group, shaping wheel and finished product collection device;

The first feed port and the second feed port are parallel and correspondingly arranged, the first feed port is connected to the first melting and stirring zone through a conveying pipe, and the second feed port is connected to the second through a conveying pipe. Melting and stirring zone; The second melting and stirring zone and the first melting and stirring zone have the same structure, and both include a stirring box, a stirring drive device respectively arranged in the stirring box, and a stirring blade spindle connected to the output end of the stirring drive device, and a connection The mixing blade on the main shaft of the mixing blade;

The bottom surface of the mixing box is provided with through holes, the through hole on the bottom of the mixing box in the first melting and stirring zone is connected to the first punch, and the through hole on the bottom of the mixing box in the second melting and stirring zone is connected to The second punching head; the first punching head and the second punching head are respectively used for supplying the melted and stirred raw materials to the rolling shaft group at a slow speed;

The prism unwinding device is arranged above the first feed port and the second feed port, and includes a prism roll material and a prism roll material mounting shaft, and the prism roll material comes from the first feed port and the second feed port Between extending downward; the coating device includes two, respectively corresponding to the two sides of the prism roll, used for coating glue on the side of the prism roll;

The rolling shaft group is arranged below the first feeding port and the second feeding port, and includes two cylindrical rolling shafts corresponding in parallel and abutting against each other and a rolling shaft group driving device that drives the cylindrical rolling shafts to rotate respectively; The two cylindrical rolling shafts are respectively parallel to the prism roll material mounting shaft, and the extended end of the prism roll material located below corresponds to the contact line where the two cylindrical rolling shafts abut against each other; the rolling shaft group driving device Drive the cylindrical rolling shaft to roll, drive the raw material at the exit of the first punch and the raw material at the exit of the second punch to be extruded from the two sides of the prism roll material and fit the prism roll material coated with glue on both sides to make Into a composite prism light guide film;

The shaping wheel is arranged on the side of the rolling shaft group, and the axis of the shaping wheel is parallel to the cylindrical rolling axis, and is used to remove the thermal stress of the composite prism light guide film formed by the rolling shaft; the finished product collection device is arranged in the shaping The wheel is away from the side of the rolling shaft group, and is used to collect the composite prism light guide film after the shaping wheel.

The composite prism light guide film production device of the present application directly prepares an integrated composite prism light guide film through the cooperation of a prism discharging device and a rolling shaft group, which has a simple structure, convenient operation, saves production procedures, and significantly reduces production costs.

Further, the two cylindrical rolling shafts in the rolling shaft group are both set as metal rolling wheels, and the surface of the metal rolling wheel is provided with a transfer structure for arranging dots of the prism light guide film.

Further, the cylindrical rolling shaft in the rolling shaft group close to the prism discharge device is a rubber elastic wheel, and the cylindrical rolling shaft in the rolling shaft group far from the prism discharge device is a metal rolling wheel, and the surface of the metal rolling wheel is The ring is used to arrange the transfer structure of the dots of the prism light guide film; the transfer structure on the surface of the metal rolling wheel allows the surface of the prism light guide film to form a variety of dot structures, increasing the optical characteristics of the prism light guide film product.

Further, a first heating device is arranged inside the metal rolling wheel along the axial direction, and the first heating device is beneficial for the raw materials extruded from the first punch and the second punch to be more easily squeezed and rolled into the prism. Attach it into a composite light guide film.

Further, the shaping wheel is a metal wheel with a smooth surface, and a second heating device is arranged inside the metal wheel along the axial direction; by heating and the first heating device on the rolling shaft group, a production environment with alternating cold and heat is formed, eliminating The internal stress of the prism light guide film output by the rolling shaft group and the warpage of the product are improved.

Further, a tension control device is provided between the prism discharging device and the coating device, and the tension control device is used to adjust the surface tension of the prism roll conveyed between the prism discharging device and the rolling shaft group.

Further, the prism light guide film production equipment further includes a control unit, which is electrically connected to the stirring drive device and the rolling shaft group drive device.

Further, the raw materials entered by the first feed port and the second feed port include PC, PMMA, PS and MS.

It can be seen from the above technical solution that the composite prism light guide film production device provided by the technical solution of the application has the following beneficial effects:

The composite prism light guide film production device disclosed in the present application, by adjusting the forming process of the prism light guide film production, directly attaches prisms and sets the dots on the surface of the light guide film, and integrally forms the composite prism light guide film. The technical solution is reasonable in design and structure Simple; this application sets the prism roll material between the two punch heads, and uses the rolling shaft group to attach the raw material at the exit of the two punch heads to the prism roll material from both sides, and then transfer the surface of the rolling shaft group The structure is designed to print dots on the side of the composite prism light guide film away from the prism roll material, and simultaneously achieve different technical effects on the composite prism light guide film product, which greatly improves the light-gathering performance of the composite prism light guide film product. Reduce the production cost of the film. In addition, the present application uses a rolling shaft group with two cylindrical rolling shafts to extrude the raw materials during the shaping stage of the light guide film, and the metal shaping wheel is used to shape the shaped composite prism light guide film. While avoiding the film warping caused by a single cylindrical roller while reducing the internal stress of the film, the composite prism light guide film produced is of high quality.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings may be obtained based on these drawings, without exceeding the scope of protection claimed in this application.

Fig. 1 is a structural diagram of a composite prism light guide film production device of this application.

In the figure, the specific meaning of each mark is:

1-first feed port, 1-1-second feed port, 2-conveying pipeline, 3-first melting and stirring zone, 3-1-2 second melting and stirring zone, 4-first punch, 4 -1-Second punch head, 5-prism discharging device, 6-coating device, 7-metal rolling wheel, 8-shaping wheel, 9-finished product collection device.

detailed description

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of this application.

Based on the prior art, the production of composite prism light guide film is mainly made of a single material. First, it is injection molded into a common light guide film, then prism attachment and dot design are performed, and finally a composite prism light guide film is made, so that the composite prism light guide film The technical problems of numerous production processes, inability to integrally form, and low production efficiency. This application aims to propose a new composite prism light guide film production device, which integrally forms a composite prism light guide film with fast processing speed, high production efficiency, and products Good quality.

In the following, the composite prism light guide film production device of the present application will be further described in detail with reference to the embodiments shown in the drawings.

As shown in Figure 1, a composite prism light guide film production device includes a first feed port 1, a first melting and stirring zone 3, a first punch 4, a second feed port 1-1, a second melting Stirring zone 3-1, second punching head 4-1, prism discharge device 5, coating device 6, rolling shaft group, shaping wheel 8 and finished product collection device 9; the first feed port 1 and the second The feed ports 1-1 are parallel and correspondingly arranged, the first feed port 1 is connected to the first melting and stirring zone 3 through a conveying pipe 2, and the second feed port 1-1 is connected to the second through a conveying pipe 2. Melting and stirring zone 3-1; the second melting and stirring zone 3-1 and the first melting and stirring zone 3 have the same structure, and both include a stirring box, a stirring drive device respectively arranged in the stirring box, and an output connected to the stirring drive device The mixing blade main shaft at the end and the mixing blade connected to the mixing blade main shaft; the first feed port 1 is connected to the mixing box of the first melting and stirring zone 3, and the second feed port 1-1 is connected to the second melting and stirring zone The mixing tanks in the zone 3-1 are respectively used for conveying raw materials into the mixing tank; the raw materials entering the first feed port 1 and the second feed port 1-1 include PC, PMMA, PS and MS.

A through hole is provided on the bottom surface of the mixing box body, the through hole on the bottom surface of the mixing box body of the first melting and stirring zone 3 is connected to the first punch 4, and the bottom surface of the mixing box body of the second melting and stirring zone 3-1 The through hole of is connected to the second punch head 4-1; the first punch head 4 and the second punch head 4-1 are respectively used to feed the molten and stirred raw materials to the rolling shaft group at a slow speed; The prism discharging device 5 is arranged above the first feed port 1 and the second feed port 1-1, and includes a prism roll material and a prism roll material mounting shaft. The prism roll material flows from the first feed port 1 and The second feeding port 1-1 extends downward; the coating device 6 includes two, respectively corresponding to the two sides of the prism roll material, used to coat glue on the side of the prism roll material; the rolling shaft The group is arranged below the first feed port 1 and the second feed port 1-1, and includes two cylindrical rolling shafts corresponding in parallel and abutting against each other and a rolling shaft group driving device that drives the cylindrical rolling shafts to rotate respectively; The two cylindrical rolling shafts are respectively parallel to the prism roll material mounting shaft, and the extended end of the prism roll material located below corresponds to the contact line where the two cylindrical rolling shafts abut against each other.

The rolling shaft group driving device drives the cylindrical rolling shaft to roll, and drives the raw material at the outlet of the first punch 4 and the raw material at the outlet of the second punch 4-1 to squeeze and fit the two sides of the prism roll material respectively The prism roll material coated with glue is extruded into a composite prism light guide film.

The shaping wheel 8 is arranged on the side of the rolling axis group, and the axis of the shaping wheel 8 is parallel to the cylindrical rolling axis, and is used to remove the internal stress of the composite prism light guide film composed of the rolling axis, that is, the thermal stress; The finished product collection device 9 is arranged on the side of the shaping wheel 8 away from the rolling shaft group, and is used to collect the composite prism light guide film after the internal stress is removed by the shaping wheel 8.

In combination with specific embodiments, the rolling shaft set is used to attach the prism roll material between the ordinary guide dies for extrusion molding and design the dot structure on the side of the guide mold away from the prism roll material. Therefore, as shown in the drawings In an embodiment, the two cylindrical rolling shafts in the rolling shaft group are both set as a metal rolling wheel 7, and the metal rolling wheel 7 is provided with a transfer structure for arranging dots on the prism light guide film on the surface circumference of the metal rolling wheel 7; The structure allows the surface of the composite prism light guide film to form multiple forms of dot structures, such as uniform point-shaped convex structures or wave-shaped convex structures, which are used to increase the optical characteristics of the composite prism light guide film products. Of course, the model of the prism roll material can also be adjusted to adapt to each dot structure.

In another embodiment, in order to facilitate the extrusion of the raw material extruded by the punching head to be more easily extruded into the light guide film sheet, that is, to maintain the thermoplasticity, the metal rolling wheel 7 is provided with a first heating device. The shaping wheel 8 is also set as a metal wheel with a smooth surface, and a second heating device is arranged inside the metal wheel. The second heating device and the first heating device can be set to have a temperature difference to eliminate the composite prism by heating or alternating cold and heat. The internal stress of the light guide film and the improvement of the warpage phenomenon of the product, eliminate the unevenness of the light guide film caused by the uneven force of the light guide film during the cutting process or the thermal expansion and contraction during the transportation process. Generally, the first heating device and the second heating device are both set as resistance heating devices, and the resistance heating method is safer, more reliable and convenient to control than the oil heating method.

In order to prevent insufficient surface tension of the prism roll material, the prism roll material is inclined or accumulated on the surface when the raw material forming sheet at the exit of the two punching heads is squeezed by the rolling shaft group, resulting in poor light-gathering effect of the composite prism light guide film Phenomenon, a tension control device is provided between the prism discharging device 5 and the coating device 6. The tension control device is used to adjust the surface tension of the prism roll conveyed between the prism discharging device 5 and the rolling shaft group, such as electromagnetic Tension adjustment device, spring tension adjustment device, and tension sensor.

In the embodiment shown in the drawings, the composite prism light guide film production device further includes a control unit that is electrically connected to the stirring drive device and the rolling shaft group drive device; in the specific implementation process, the control unit should also It is electrically connected to the first heating device and the second heating device to achieve the effect of heating and temperature control.

The composite prism light guide film production device disclosed in the present application adopts two conflicting metal rolling wheels 7 with a dot transfer structure at the outlet of the first punch 4 and the raw material at the outlet of the second punch 4-1 The sides far away from each other are pressed separately, so that the raw materials are attached to the two sides of the prism roll material coated with glue from both sides to form a composite prism light guide film. The two metal rolling wheels 7 with dot transfer structure are synchronized on the composite prism guide The dot structure is transferred on both sides of the light film away from the prism roll material to realize the integrated molding of the composite prism light guide film; in addition, a metal shaping wheel 8 is used to remove the internal stress and curling of the molded composite prism light guide film The device of this application has a reasonable design, a simple structure, and a variety of raw materials are used. The light-gathering performance of the extruded composite prism light guide film product is greatly improved, the product quality is high, the processing speed is fast, the production efficiency is high, and the production cost is significantly reduced.

The embodiments of the present application are described in detail above, and specific examples are used in this article to illustrate the principles and implementation manners of the present application. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application. At the same time, changes or modifications made by those skilled in the art based on the ideas of the application, the specific implementation and the scope of application of the application, are all within the protection scope of the application. In summary, the content of this specification should not be construed as a limitation on this application.

Claims

A composite prism light guide film production device, which is characterized by comprising a first melting and stirring zone, a first punch, a second melting and stirring zone, a second punch, a prism discharge device, a coating device, and a rolling shaft Group and shaping wheel;

The first melting and stirring zone and the second melting and stirring zone have the same structure, and both include a stirring box, a stirring drive device respectively arranged in the stirring box, a stirring blade main shaft connected to the output end of the stirring drive device, and a stirring blade main shaft The mixing blade is provided with a through hole on the bottom surface of the mixing box;

The through hole of the first melting and stirring zone is connected to the first punch, and the through hole of the second melting and stirring zone is connected to the second punch; the first punch and the second punch The punch heads are respectively used to feed the melted and stirred raw materials to the rolling shaft group at a slow speed;

The prism unwinding device includes a prism roll material and a prism roll material mounting shaft, and the prism roll material extends downward from between a first feed port and a second feed port;

The coating device includes two coating devices, respectively corresponding to the two sides of the prism roll material, for coating glue on the sides of the prism roll material;

The rolling shaft group arrangement includes two cylindrical rolling shafts corresponding in parallel and abutting against each other and a rolling shaft group driving device that drives the cylindrical rolling shafts to rotate respectively; the two cylindrical rolling shafts are installed parallel to the prism roll material respectively Shaft, and the extended end of the prism roll material located below corresponds to the contact line where the two cylindrical rolling shafts abut against each other;

The cylindrical rolling shaft rolls, and drives the raw material at the outlet of the first punch and the raw material at the outlet of the second punch to be squeezed from both sides of the prism roll material and attached to a prism roll coated with glue on both sides Material to make composite prism light guide film;

The shaping wheel is arranged on the side of the rolling axis group, and the axis of the shaping wheel is parallel to the cylindrical rolling axis, and is used to remove the thermal stress of the composite prism light guide film formed by the rolling axis.
The composite prism light guide film production device according to claim 1, wherein the two cylindrical rolling shafts in the rolling shaft group are both set as metal rolling wheels, and the metal rolling wheel surface circumference is provided for Arrange the transfer structure of the prism light guide film dots.
4. The composite prism light guide film production device according to claim 2, wherein a first heating device is arranged inside the metal rolling wheel along the axial direction.
The composite prism light guide film production device according to claim 1, wherein the shaping wheel is a metal wheel with a smooth surface, and a second heating device is arranged inside the metal wheel along the axial direction.
The composite prism light guide film production device according to claim 1, wherein a tension control device is provided between the prism discharging device and the coating device, and the tension control device is used to adjust the prism discharging device and the coating device. The surface tension of the prism roll conveyed between the rolling shaft groups.
4. The composite prism light guide film production device according to claim 1, further comprising a control unit electrically connected to the stirring drive device and the rolling shaft group drive device.
The composite prism light guide film production device according to claim 1, further comprising: a first feed port and a second feed port, the first feed port and the second feed port being parallel and corresponding It is provided that the first feed port is connected to the first melting and stirring zone through a conveying pipe, and the second feed port is connected to the second melting and stirring zone through a conveying pipe.
The composite prism light guide film production device according to claim 7, wherein the raw materials entered by the first feed port and the second feed port include one or more of PC, PMMA, PS, and MS .
The composite prism light guide film production device according to claim 1, further comprising: a finished product collection device, which is arranged on the side of the shaping wheel away from the rolling shaft group, and is used to collect the composite after the shaping wheel acts. Prism light guide film.