Transfer printing device capable of preventing pattern from falling off

Abstract

The utility model relates to a transfer printing device for preventing a pattern from falling off, which comprises a support table, a film supply mechanism and a hot pressing mechanism, the film supply mechanism comprises a film unwinding roller and a film winding roller, and the film unwinding roller and the film winding roller are respectively positioned on two sides of the hot pressing mechanism; a preheating box is arranged between the film unwinding roller and the hot pressing mechanism, a preheating channel penetrating through the preheating box is arranged in the preheating box, and first heating mechanisms are arranged above and below the preheating channel. The transfer printing film is preheated through the preheating box, the temperature of the transfer printing film is increased, then the transfer printing film is subjected to hot-pressing printing through the hot-pressing mechanism, the temperature of the hot-pressing film can be increased to the printing temperature more quickly, and the transfer printing efficiency is improved. In addition, the initial temperature of the hot-pressing film is increased when the hot-pressing film is in contact with the hot-pressing mechanism, and the temperature difference of the hot-pressing film from the initial temperature to the transfer printing temperature is reduced, so that the temperature difference of all parts of the hot-pressing film can be reduced, the heating uniformity of the transfer printing film is improved, and patterns or coatings are prevented from falling off.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of transfer printing equipment, especially a transfer printing device capable of preventing pattern peeling. BACKGROUND

[0002] Film transfer printing is a technology that transfers patterns or text from a transfer film to the surface of a substrate. It is widely used in the decoration and marking of various materials, such as plastics, metals, glass, ceramics, wood, etc. Specifically, film transfer printing transfers patterns on the transfer film to the surface of the substrate through hot or cold pressing. The transfer film is usually composed of a carrier film (such as PET film) and a pattern layer (such as ink or coating). During the transfer process, the pattern layer is combined with the surface of the substrate, and the carrier film is peeled off.

[0003] The existing hot transfer printing device can refer to the utility model patent with application number CN202022730027.X, which provides a novel automatic transfer printing machine. The machine frame is provided with a film placing roller, a film collecting roller, and a transfer printing device. The transfer printing device is located between the film placing roller and the film collecting roller. The transfer film is placed on the film placing roller and wound around the transfer printing device bottom end and the film collecting roller. A transfer plate for placing the to-be-transferred object is arranged below the transfer printing device. The transfer printing device can move longitudinally to transfer the pattern on the transfer film to the to-be-transferred object.

[0004] During the transfer process, the pattern or coating transferred to the surface of the substrate may peel off or fall off due to insufficient adhesion, which not only affects the appearance and quality of the product, but also may reduce its durability. When using the hot transfer printing process, pattern or coating peeling is usually caused by uneven heating of the transfer film. The existing technology cannot solve this problem. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a transfer printing device capable of preventing pattern peeling, which can improve the uniformity of the heating of the transfer film and prevent pattern or coating peeling.

[0006] To solve the above problems, the utility model adopts the following technical scheme: a transfer printing device capable of preventing pattern peeling, comprising a support table, a film supply mechanism, and a hot pressing mechanism. The film supply mechanism comprises a film unwinding roller and a film winding roller. The film unwinding roller and the film winding roller are respectively located on the two sides of the hot pressing mechanism.

[0007] A preheating box is arranged between the film unwinding roller and the hot pressing mechanism. A preheating channel penetrating the preheating box is arranged in the preheating box. First heating mechanisms are arranged above and below the preheating channel.

[0008] Further, two guide rollers are arranged at the inlet and outlet of the preheating channel, and the two guide rollers have a film passing distance therebetween.

[0009] Further, the support table is provided with a positioning frame, the positioning frame is provided with a positioning platform in sliding fit with the positioning frame, and the positioning platform is connected with a first lifting mechanism for driving the positioning platform to lift.

[0010] Further, the upper surface of the positioning platform is provided with a detachable positioning plate, and the upper surface of the positioning plate is provided with a printing object positioning groove.

[0011] Further, the upper surface of the positioning platform is provided with a groove, the groove bottom is provided with a vertical positioning hole, the lower part of the positioning plate is located in the groove, the lower surface of the positioning plate is provided with a guide rod, the guide rod extends into the positioning hole and is in sliding fit with the positioning hole, and the groove bottom is provided with a plurality of pressure sensors.

[0012] Further, the hot pressing mechanism comprises a second lifting mechanism, and the lower end of the second lifting mechanism is connected with a hot pressing head.

[0013] Further, the hot pressing head comprises a pressing block, the pressing block is internally provided with a heating cavity, the heating cavity is provided with a second heating mechanism, and the top wall and the side wall of the pressing block are provided with a first heat insulation layer.

[0014] Further, the second heating mechanism is an electric heating wire.

[0015] Further, the outer wall of the preheating box is provided with a second heat insulation layer, and the first heating mechanism comprises a plurality of electric heating wires.

[0016] The beneficial effects of the present application are as follows: the present application first preheats the transfer film through the preheating box, improves the temperature of the transfer film, then adopts the hot pressing mechanism to perform hot printing on the transfer film, the hot pressing film can be heated to the printing temperature more quickly, and the transfer efficiency is improved. In addition, since the initial temperature of the hot pressing film increases when the hot pressing film contacts the hot pressing mechanism, the temperature difference of the hot pressing film from the initial temperature to the transfer temperature is reduced, so that the temperature difference of each part of the hot pressing film can be reduced, the heating uniformity of the transfer film is improved, and the pattern or coating is prevented from falling off. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a front view of the present application embodiment one;

[0018] Figure 2 is an enlarged schematic view of the preheating box;

[0019] Figure 3 is a front view of the present application embodiment two;

[0020] Figure 4 is an enlarged schematic view of the positioning platform;

[0021] Reference numerals: 1—Support platform; 2—Film unwinding roller; 3—Film rewinding roller; 4—Preheating box; 5—Preheating channel; 6—First heating mechanism; 7—Guide roller; 8—Positioning frame; 9—Positioning platform; 10—First lifting mechanism; 11—Positioning plate; 12—Substrate positioning groove; 13—Second lifting mechanism; 14—Pressure block; 15—Heating chamber; 16—Second heating mechanism; 17—First insulation layer; 18—Guide rod; 19—Pressure sensor; 20—Second insulation layer. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] The transfer device for preventing pattern fading in this embodiment, such as Figure 1 and Figure 2 As shown, the system includes a support platform 1, a film supply mechanism, and a hot-pressing mechanism. The support platform 1 is made of a horizontally arranged metal plate, such as stainless steel, with multiple vertical support legs at the bottom to ensure it is at a suitable height. The film supply mechanism is used to supply and recycle the transfer film, specifically including a film unwinding roller 2 and a film take-up roller 3, which are located on opposite sides of the hot-pressing mechanism. The transfer film is wound on the film unwinding roller 2, and the transferred film can be wound onto the film take-up roller 3. A stand can be installed on the support platform 1, and the film unwinding roller 2 and film take-up roller 3 are rotatably mounted on the stand. The film unwinding roller 2 and film take-up roller 3 are horizontally arranged, and the film take-up roller 3 is connected to a rotation drive mechanism. The rotation drive mechanism can use existing equipment such as a servo motor to drive the film unwinding roller 2 and film take-up roller 3 to rotate, thereby unwinding or rewinding the transfer film. The film unwinding roller 2 and the film take-up roller 3 work together to continuously transport the transfer film to the area below the hot pressing mechanism for transfer, while simultaneously winding the transferred film onto the film take-up roller 3.

[0025] A preheating box 4 is installed between the film unwinding roller 2 and the hot pressing mechanism. A preheating channel 5 runs through the preheating box 4, and a first heating mechanism 6 is installed above and below the preheating channel 5. The preheating box 4 is used to preheat the transfer film. Specifically, the transfer film passes through the preheating channel 5, and the first heating mechanism 6 can simultaneously heat the upper and lower surfaces of the transfer film, increasing its temperature. The outlet of the preheating channel 5 is located close to the hot pressing mechanism, allowing the preheated transfer film to quickly reach the hot pressing mechanism, preventing it from cooling down due to prolonged exposure to air.

[0026] The operation process of the utility model discloses: the transfer film is wound to the membrane unwinding roller 2, and one end of the transfer film is sequentially threaded through the preheating channel 5, the lower part of the hot-pressing mechanism and is wound to the membrane winding roller 3. When transferring, the first heating mechanism 6 preheats the transfer film, and the preheated transfer film is transported to the lower part of the hot-pressing mechanism, and then the support table 1 under the hot-pressing mechanism is used to fix the printing object, and then the hot-pressing mechanism is moved downward, the transfer film is heated to the transfer temperature when the hot-pressing mechanism contacts the transfer film, and the transfer film is moved downward, when the transfer film contacts the printing object, the hot-pressing mechanism applies appropriate pressure to the transfer film, and the pattern on the transfer film is transferred to the printing object. Then the hot-pressing mechanism resets upwards, the membrane winding roller 3 rotates by an appropriate angle, the transfer film is wound, and the membrane unwinding roller 2 is pulled to rotate, and the transfer film is unwound. The above process is repeated, and continuous transfer can be realized.

[0027] In the utility model, the transfer film is preheated, so that when the transfer film contacts the hot-pressing mechanism, the temperature difference between the transfer film and the required transfer temperature is reduced, therefore, the non-uniformity of the hot-pressing mechanism during the heating process of the transfer film is reduced, the heating uniformity of the transfer film is improved, and the pattern or coating is prevented from falling off. At the same time, the hot-pressing mechanism can quickly heat the transfer film to the transfer temperature, and the transfer efficiency can be improved.

[0028] In order to prevent the transfer film from being damaged by contacting the port, top wall or side wall of the preheating channel 5, two guide rollers 7 are arranged at the inlet and outlet of the preheating channel 5, and the two guide rollers 7 have a film passing space therebetween. The guide roller 7 can be rotatably installed in the preheating box 4, and the transfer film passes through the film passing space between the two guide rollers 7 and does not directly contact the preheating box 4.

[0029] In the embodiment, the hot-pressing mechanism includes a second lifting mechanism 13, which can be a gas cylinder or a hydraulic cylinder, and the lower end of the second lifting mechanism 13 is connected with a hot-pressing head. The lower surface shape of the hot-pressing head is matched with the printing surface shape of the printing object, so that the transfer film can be attached to the printing surface of the printing object.

[0030] The hot-pressing head specifically includes a pressing block 14, the inside of the pressing block 14 is provided with a heating cavity 15, the heating cavity 15 is provided with a second heating mechanism 16, and the top wall and side wall of the pressing block 14 are provided with a first heat insulation layer 17. The pressing block 14 is made of a material with high thermal conductivity, such as metal, which can quickly transfer the heat of the second heating mechanism 16 to the transfer film. The first heat insulation layer 17 can be made of existing materials such as heat insulation cotton, which can reduce the heat loss of the pressing block 14. The second heating mechanism 16 does not directly contact the bottom wall of the heating cavity 15, the heat generated by the second heating mechanism 16 is transmitted to the bottom wall of the pressing block 14 through the air in the heating cavity 15, which can improve the uniformity of the bottom wall temperature of the pressing block 14 and further ensure the uniformity of the heating of the transfer film.

[0031] The second heating mechanism 16 is an electric heating wire, and a plurality of electric heating wires can be arranged and uniformly distributed in the heating cavity 15.

[0032] The preheating box 4 can be a metal box, and a second heat insulation layer 20 is arranged on the outer wall of the preheating box 4 to reduce heat loss. The first heating mechanism 6 includes a plurality of electric heating wires, which are uniformly distributed to ensure uniform preheating. An insulating layer can be arranged on the inner wall of the preheating channel 5 to prevent electric leakage of the electric heating wires.

[0033] Embodiment Two

[0034] In the existing transfer printing device, the heat pressing mechanism is usually moved downward to push the transfer film downward until the transfer film contacts the printing object. Since the transfer film has low strength, the transfer film is easily damaged and deformed when the heat pressing mechanism pushes the transfer film downward, thereby affecting the transfer printing quality.

[0035] The transfer printing device for preventing pattern falling off in the embodiment, as shown in Figure 3 and Figure 4 , is based on the embodiment one, and a positioning frame 8 is arranged on the support table 1. The positioning frame 8 is a plurality of vertical columns, and the lower ends of the columns are fixed on the support table 1. The positioning frame 8 is provided with a positioning platform 9 which is in sliding cooperation with the positioning frame 8, and the positioning platform 9 is connected with a first lifting mechanism 10 which drives the positioning platform 9 to lift. The first lifting mechanism 10 can be a cylinder, a hydraulic cylinder or the like. During transfer printing, the printing object is placed on the upper surface of the positioning platform 9, and then the first lifting mechanism 10 pushes the positioning platform 9 and the printing object upward until the printing object contacts the transfer film. Then, the heat pressing mechanism moves downward, and the heat pressing mechanism contacts the transfer film to heat and apply appropriate pressure to the transfer film. After the transfer printing is completed, the first lifting mechanism 10 pushes the positioning platform 9 and the printing object downward to reset, and the heat pressing mechanism moves upward. During the transfer printing process, the transfer film does not need to be pushed downward, which can prevent the transfer film from being deformed and damaged due to force during movement.

[0036] In order to facilitate the fixation of the printing object, the upper surface of the positioning platform 9 is provided with a detachable positioning plate 11, and the upper surface of the positioning plate 11 is provided with a printing object positioning groove 12. The profile of the printing object positioning groove 12 is matched with the outer profile of the printing object. After the printing object is placed in the printing object positioning groove 12, the printing object can be kept stable. The positioning plate 11 can be detachably installed, which is conducive to the replacement of the positioning plate 11 with the printing object positioning groove 12 having different shapes, so as to be applicable to transfer printing of various printing objects.

[0037] Specifically, in order to facilitate the disassembly and assembly of the positioning plate 11, a recess is arranged on the upper surface of the positioning platform 9, a vertical positioning hole is arranged on the bottom of the recess, the lower part of the positioning plate 11 is located in the recess, and a guide rod 18 is arranged on the lower surface of the positioning plate 11, the guide rod 18 extends into the positioning hole and is in sliding fit with the positioning hole, and a plurality of pressure sensors 19 are arranged on the bottom of the recess. When the positioning plate 11 is installed, the positioning plate 11 is placed into the recess, and the guide rod 18 is inserted into the positioning hole. The positioning plate 11 is supported by the pressure sensors 19, the pressure applied by the hot-pressing mechanism on the transfer film during the transfer can be detected, and thus the transfer pressure is ensured to be consistent with the process requirements.

[0038] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A transfer device for preventing pattern detachment, comprising a support platform (1), a film supply mechanism, and a hot pressing mechanism, wherein the film supply mechanism comprises a film unwinding roller (2) and a film take-up roller (3), the film unwinding roller (2) and the film take-up roller (3) being located on opposite sides of the hot pressing mechanism; characterized in that: A preheating box (4) is provided between the film unwinding roller (2) and the hot pressing mechanism. A preheating channel (5) is provided inside the preheating box (4) and a first heating mechanism (6) is provided above and below the preheating channel (5).

2. The transfer device for preventing pattern fading as described in claim 1, characterized in that: The preheating channel (5) is equipped with two guide rollers (7) at both the inlet and outlet, and there is a film-passing gap between the two guide rollers (7).

3. The transfer device for preventing pattern fading as described in claim 1, characterized in that: The support platform (1) is provided with a positioning frame (8), and the positioning frame (8) is provided with a positioning platform (9) that slides with the positioning frame (8). The positioning platform (9) is connected to a first lifting mechanism (10) that drives the positioning platform (9) to rise and fall.

4. The transfer device for preventing pattern fading as described in claim 3, characterized in that: The upper surface of the positioning platform (9) is provided with a detachable positioning plate (11), and the upper surface of the positioning plate (11) is provided with a substrate positioning groove (12).

5. The transfer device for preventing pattern fading as described in claim 4, characterized in that: The upper surface of the positioning platform (9) is provided with a groove, and the bottom of the groove is provided with a vertical positioning hole. The lower part of the positioning plate (11) is located in the groove, and the lower surface of the positioning plate (11) is provided with a guide rod (18). The guide rod (18) extends into the positioning hole and slides with the positioning hole. The bottom of the groove is provided with multiple pressure sensors (19).

6. The transfer device for preventing pattern fading as described in claim 1, characterized in that: The hot pressing mechanism includes a second lifting mechanism (13), and the lower end of the second lifting mechanism (13) is connected to a hot pressing head.

7. The transfer device for preventing pattern fading as described in claim 6, characterized in that: The hot press head includes a pressing block (14), a heating chamber (15) is provided inside the pressing block (14), a second heating mechanism (16) is provided inside the heating chamber (15), and a first heat insulation layer (17) is provided on the top wall and side wall of the pressing block (14).

8. The transfer device for preventing pattern fading as described in claim 7, characterized in that: The second heating mechanism (16) is an electric heating wire.

9. The transfer device for preventing pattern fading as described in claim 1, characterized in that: The preheating box (4) has a second heat insulation layer (20) on its outer wall, and the first heating mechanism (6) includes multiple electric heating wires.

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