TW201332745A - Heat pressure molding method - Google Patents

Abstract

The primary objective of the present invention is to provide a heat pressure molding method, which separates the heating device and the pressing device from the light guide panel manufacturing mold in prior art, so as to preheat the panel outside the mold and then convey the heated panel into the mold via a conveyer. Finally, the pressing procedure could be individually applied inside the mold. By this means, the negative influence led by nonuniform temperature in the mold would be avoided during the panel pressing procedure, and the yield rate of the manufacturing could be efficiently enhanced.

Description

Hot press forming method

The invention relates to a hot press forming method, in particular to a light guide plate forming method which uses preheating and then pressurizes in a mold.

The conventional Light Guide Panel (LGP) hot press forming method mainly places the object to be embossed in a cavity of an imprinting mold, and the imprinting mold comprises a set of first template, the first template Each of the embossing surfaces having an embossed optical grain is formed by placing the embossing between the surfaces of the first stencil having the embossed optical lines, and then the first stencil forms a closed cavity. The embossed material is present in the closed cavity, and after the embossing die is closed, the embossing die is heated to soften the embossed material to a plastic state, and then the embossing die presses the embossed material to make the first template The embossed lines are formed on the embossed material, and finally the embossed material is cooled, and the embossed mold is opened to take out the molded article.

In the prior art, the pressurizing device uses oil pressure, air pressure or other driver as a source of output pressure, and the conventional heating device is configured to drill a water path on the upper first template or the imprinting mold, and then pass the heat. The liquid or the cold liquid heats or cools the embossed material, and since the pressing device and the heating device are integrally disposed, and the above-mentioned conventional heating method, the embossing mold body is heated first, and then the heat energy is transmitted through heat conduction. To the imprinted material, the transfer of thermal energy in this way is easily caused by the size of the imprinting mold, the position of the heating pipe or the waterway embedding, and the size of the imprinted material, etc., and the transfer is not constant, and the imprinted material is pressed. The influence of uneven temperature of the printing mold itself leads to the problem of uneven transfer, so the yield of the imprinted product in mass production is not easy to be improved. Therefore, based on the above reasons, the inventors of the present invention contemplate and design a hot press forming method. In order to improve the lack of existing technology, and to enhance the implementation of the industry.

In view of the above-mentioned problems, the main object of the present invention is to provide a hot press forming method having novelty, advancement and industrial utilization, etc., in order to overcome the difficulties of the prior art.

In order to achieve the above object, the technical means adopted by the present invention is to design a hot press forming method, which comprises:
A. a preheating step of heating a thermoplastic material having the optical properties required for the light guide plate through a heating module to soften it to an embossable state; B. transporting the raw material step The thermoplastic material is transferred from the heating module to an imprinting mold by a transfer module after the A. preheating step, wherein the imprinting mold comprises an upper mold, a lower mold and at least a transfer plate; wherein the upper mold is combinable with the lower mold, and surrounds therein to form an imprint mold cavity for accommodating the thermoplastic material, and the transfer plate is disposed in the imprint mold cavity a top wall surface, a lower wall surface or an upper wall surface and a lower wall surface; C. a clamping step of clamping the upper mold and the lower mold to perform the mold clamping to adhere the thermoplastic material to the stamping mold The step of embossing is to press the upper surface of the embossing cavity against the thermoplastic material and apply a pressing force; E. the step of cooling and hardening, which is preset through the embossing die Cooling system to reduce the temperature of the imprinting cavity F. and the mold opening step, which is based on the E. cool after the hardening step, and further the upper mold and the lower mold separation.

Wherein, the upper mold or the lower mold is provided with at least one vacuum control line for vacuuming the imprinting mold cavity for controlling the imprinting and mold opening; wherein the thermoplastic material is methacrylic acid a block of a material of a methyl ester or a polycarbonate; wherein the heating module is a heating plate; wherein the heating module has at least one temperature control unit, and the temperature control unit performs temperature control by radiant heat or heat convection; The transfer module is a conveyor belt, a holding movable tool or a mechanical arm; wherein the transfer plate has a transfer surface on which a precise pattern is formed; wherein the transfer plate is A separate independent member that is disassembled from the embossing cavity; wherein the cooling system is a means for cooling the mold through liquid temperature or air flow.

The hot press forming method of the present invention is designed to be separated from the pressurizing transfer device by using a heating device which is originally integrated in the hot stamping process of the conventional light guide plate, and can be heated outside the mold first, and then Through a transmission means to convey the material into the mold, and then complete the action of pressure transfer, through such action, the hot stamping process can be affected by the uneven temperature of the imprinting mold itself, resulting in a surface If the product is not evenly transferred, the product yield can be improved, and the production yield can be improved in mass production. In order to make the above objectives, technical features and gain after actual implementation more obvious, it will be better in the following. The implementation examples are accompanied by a corresponding schema for a more detailed description.

The present invention will be described in conjunction with the accompanying drawings in the accompanying drawings, and the drawings The subject matter is only for the purpose of illustration and description. It is not intended to be a true proportion and precise configuration after the implementation of the present invention. Therefore, the scope of the accompanying drawings and the configuration relationship should not be limited to the scope of the invention.

The advantages and features of the present invention, as well as the technical methods of the present invention, are described in more detail with reference to the exemplary embodiments and the accompanying drawings, and the present invention may be implemented in various forms and should not be construed as limited thereby. The embodiments of the present invention, and the embodiments of the present invention are intended to provide a more complete and complete and complete disclosure of the scope of the present invention, and The scope of the patent application is defined.

Unless otherwise defined, all terms (including technical and scientific terms) and proper nouns used hereinafter are used in the same meaning as commonly understood by those skilled in the art to which the invention belongs. Those terms defined by the dictionary should be understood to have the meaning consistent with the relevant fields, and unless explicitly defined in the following text, they will not be understood in terms of excessive idealization or excessive formality.

Referring to the first figure, the present invention proposes a hot press forming method for efficiently improving the mass production of the light guide plate in the process, which may include the following steps:
A. preheating step;
B. The step of conveying raw materials;
C. clamping step;
D. Imprinting step;
E. cooling and hardening step; and
F. The mold opening step.

Please further refer to the second figure. The foregoing A. preheating step is to use a thermoplastic material (10) having good optical properties, for example, the thermoplastic material (10) is methyl methacrylate, polycarbonate, etc. The heating block (20) may be softened to a state in which the mold is embossed by a heating module (20), wherein the heating module (20) may be a heating plate, and the heating mold The group (20) may have at least one temperature control unit, which may be temperature controlled in the form of radiant heat or thermal convection.

Please further refer to the third figure. The B. conveying raw material step is to pass the thermoplastic material (10) after the A. preheating step to the heating module by a transmission module (30). Transferring to an imprint mold (40), which may be a conveyor belt, a holding mover or a robot arm, wherein the imprint mold (40) comprises an upper mold ( 41) a lower mold (42) and at least one transfer plate (43); wherein the upper mold (41) is correspondingly combined with the lower mold (42) and surrounded therein to form an impression cavity (44), The thermoplastic material (10) to which the transfer module (30) is transferred enters the stamping cavity (44), and the transfer plate (43) is disposed in the stamping cavity (44). The upper wall surface, the lower wall surface or an upper wall surface and the lower wall surface are illustrated in the figure as being disposed on the lower wall surface, and the transfer plate (43) has a transfer surface on which the transfer surface is provided. a precision pattern engraving for transferring the precision pattern during imprinting; further, at least one of the upper mold (41) or the lower mold (42) is disposed for the imprinting mold cavity (44) Vacuum control line (45).

Furthermore, the transfer plate (43) may be in a variant embodiment or may be a detachable separate member detachable from the impression cavity (44).

Please further refer to the fourth figure. The C. clamping step is to mold the upper mold (41) and the lower mold (42) to form the mold to close the thermoplastic material (10). Within the stamping cavity (44).

Please further refer to the fifth figure, the D. embossing step is to vacuum the inside of the embossing cavity (44) through the vacuum control line (45), and then let the pressure The upper wall surface and the lower wall surface of the impression cavity (44) are pressed against the thermoplastic material (10) and provide a pressing force, thereby allowing the transfer surface on the transfer plate (43) to be made of the thermoplastic material (10) Imprint of precision graphics.

The foregoing E. cooling hardening step is to reduce the temperature of the imprinting cavity (44) through a preset cooling system in the imprinting mold (40), and the cooling system may be made of liquid temperature or air flow. The means for cooling the mold, which is a conventional technique in the prior art that has ordinary knowledge in the technical field, and therefore does not further add ink to this part in the specification.

Please further refer to the sixth figure, the F. mold opening step is after the E. cooling hardening step, and further inject air into the stamping cavity (44) through the vacuum control line (45). Further, the vacuum state in the imprinting mold cavity (44) is broken, and the upper mold (41) is separated from the lower mold (42), and the transferred thermoplastic material (10) is removed, that is, transferred. Finished light guide finished product.

Through the hot press forming method of the present invention, the design is ingeniously changed, and the heating device originally integrated into the conventional light guide plate hot stamping process is separated from the pressure transfer device, and the temperature rising action can be performed outside the mold. Then, the material is conveyed into the mold through a transmission means, thereby completing the action of pressure transfer, and by such action, the hot stamping process can be prevented from being easily affected by the temperature unevenness of the stamping die itself. As a result of uneven surface transfer and product defects, it is expected that the production yield will be improved in mass production, which is impossible for the prior art, so that the gain is visible.

The embodiments described above are merely illustrative of the technical spirit and the features of the present invention, and the objects of the present invention can be understood by those skilled in the art, and the scope of the present invention cannot be limited thereto. That is, the equivalent variations or modifications made by the spirit of the present invention should still be included in the scope of the present invention.

Looking at the above, it can be seen that the present invention breaks through the prior art first, and has indeed achieved the desired effect, and is also unfamiliar to those skilled in the art, and its progress and practicability have been consistent with patents. The application requirements, 提出 file a patent application according to law, and ask your bureau to approve the application for this invention patent, in order to invent invention, to the sense of virtue.

(10). . . Thermoplastic material

(20). . . Heating module

(30). . . Transmission module

(40). . . Imprinting mold

(41). . . Upper mold

(42). . . Lower mold

(43). . . Transfer board

(44). . . Imprinting cavity

(45). . . Vacuum control line

A to F. . . Process step

The first figure is a schematic flow chart of the hot press forming method of the present invention.
The second figure is a schematic diagram of the continuous flow of the hot press forming method of the present invention.
The third figure is a schematic diagram of the continuous flow of the hot press forming method of the present invention.
The fourth figure is a schematic diagram of the continuous flow of the hot press forming method of the present invention.
The fifth figure is a schematic diagram of the continuous flow of the hot press forming method of the present invention.
The sixth figure is a schematic diagram of the continuous flow of the hot press forming method of the present invention.

A to F. . . step

Claims (9)

A hot press forming method comprising:
A. a preheating step of heating a thermoplastic material having the optical properties required for the light guide plate through a heating module to soften it to an embossable state;
B. The step of conveying the raw material, wherein the thermoplastic material after the A. preheating step is transferred from the heating module to an imprinting mold by a transfer module, wherein the imprinting mold comprises an upper part a mold, a lower mold and at least one transfer plate; wherein the upper mold is combinable with the lower mold, and is surrounded therein to form an impression cavity to accommodate the thermoplastic material, and the transfer plate is disposed at the pressure One of the upper wall surface, the lower wall surface or an upper wall surface and the lower wall surface of the impression cavity;
C. The mold clamping step is to mold the upper mold and the lower mold to form a mold to adhere the thermoplastic material to the impression cavity;
D. an embossing step of pressing a wall surface of the embossing cavity against the thermoplastic material and applying a pressing force;
E. a step of cooling and hardening, which is to reduce the temperature of the imprinting cavity by a predetermined cooling system in the imprinting mold;
F. A mold opening step, after the E. temperature-hardening step, further separating the upper mold from the lower mold. The hot press forming method according to claim 1, wherein the upper mold or the lower mold is provided with at least one vacuum control line for vacuuming the stamping cavity to control the stamping and The means of opening the mold. The hot press forming method according to claim 2, wherein the thermoplastic material is a block of a methyl methacrylate or polycarbonate raw material. The hot press forming method according to claim 3, wherein the heating module is a heating plate. The hot press forming method according to claim 4, wherein the heating module has at least one temperature control unit, and the temperature control unit performs temperature control by radiant heat or heat convection. The hot press forming method according to claim 5, wherein the transport module is a conveyor belt, a holding implement or a robot arm. The hot press forming method according to claim 6, wherein the transfer plate has a transfer surface on which a precise pattern is formed. The hot press forming method according to claim 7, wherein the transfer plate is a separate independent member detachable from the imprint cavity. The hot press forming method according to claim 8, wherein the cooling system is a means for cooling the mold by a liquid temperature or a gas flow.