A process for heat transfer printing on the surface of a resin article

Abstract

The present application relates to a kind of resin product surface heat transfer printing process, it mainly solves the poor adhesion of existing technology heat transfer printing pattern pigment and resin product, easily cause the peeling of pattern pigment problem, 1) by scraper coating mechanism on one surface of base film Coating a layer of resin material layer, again by first baking oven baking;2) continuously punch in the product in step 1);3) the bottom film is compounded on the other surface of base film;4) by pattern forming mechanism, ink is coated on resin material layer;5) the two sides of heat transfer film are preheated;6) resin product is transferred to the heat transfer printing station in second baking oven, and resin product and heat transfer film are heated by second baking oven;7) the image of resin product surface is obtained by image recognition system, and the raised area, recessed area and plane area on the surface of resin product are identified, then control pressing mechanism works;8) tear open base film and bottom film.

Description

TECHNICAL FIELD

[0001] The present application relates to a resin product surface heat transfer printing process. BACKGROUND

[0002] Flower cultivation has become a common leisure and entertainment for people. Flower cultivation not only can cultivate sentiments and make people happy, but also can purify the air. Potted flowers cannot be separated from the tool-flowerpot. According to different production materials, flowerpots can be divided into many types, mainly including ceramic flowerpots, plastic flowerpots, natural stone flowerpots, wooden flowerpots, glass steel flowerpots, and cement flowerpots. Plastic flowerpots have a large share in the current flowerpot market because of their light weight, various shapes and colors, low price, and suitability for industrial mass production. Plastic flowerpots are divided into plastic flowerpots and resin flowerpots. The plastic flowerpot is made of polypropylene as the main raw material, and the resin flowerpot is made of various resins (such as urea-formaldehyde resin and epoxy resin) as the main raw material, and appropriately adding curing agent, filler, and additive. The patent with the name of an environmental protection resin flowerpot and its preparation method, with the authorization announcement number CN114292047B, specifically discloses that the mass ratio of resin raw materials is reduced from more than 50% to less than 15%, which meets the safety and environmental protection production concept, and the mass ratio of the filler is increased to more than 80%, so that the impact strength of the resin flowerpot product is obviously enhanced, and it is not easy to crack. Moreover, the product obtained by simply processing the mine tailings or construction waste is used as the filler, which not only reduces the adverse effects caused by solid waste garbage stacking and landfill, has a positive effect of relieving the pressure of solid waste accumulation, but also realizes the secondary utilization of resources, forming a sustainable utilization and recycling system.

[0003] In subsequent processing, in order to improve the aesthetic degree of the resin flowerpot, patterns need to be added to the surface of the resin flowerpot. The traditional way is to spray paint, that is, to spray primer paint on the surface of the resin flowerpot, and then to spray or brush paint according to the shape and effect of the resin flowerpot after the primer paint is dried. However, this method has poor environmental protection and low efficiency. In further exploration, heat transfer printing is used to add patterns to the surface of the resin flowerpot. For example, the patent with the application publication number CN109878204A discloses a sapphire mobile phone back cover heat transfer printing process, which specifically discloses the following steps: step one, cleaning the sapphire mobile phone back cover; step two, printing patterns on the pet film; step three, the side of the pet film containing the printed patterns is attached to one side of the sapphire mobile phone back cover; step four, the heat transfer machine works to transfer the patterns on the pet film to the sapphire mobile phone back cover by heating; step five, removing the pet film; step six, detecting the printing effect; step seven, drying the sapphire mobile phone back cover; and step eight, uv printing texture.

[0004] The pattern can be added to the surface of the resin flowerpot to a certain extent through the above heat transfer printing process, however, the adhesion of the pattern pigment and the resin flowerpot is poor, the pattern pigment is easily wiped off during the movement of the resin flowerpot, or the pattern pigment is naturally dropped during long time use. SUMMARY

[0005] Therefore, aiming at the above problems, the resin product surface heat transfer printing process provided by the present application mainly solves the problem of poor adhesion of the heat transfer printing pattern pigment and the resin product in the prior art, which easily causes the pattern pigment to fall off.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A resin product surface heat transfer printing process, comprising the following steps:

[0008] 1) The base film in a roll structure is unwound and conveyed through a base film unwinding roller, and a layer of resin material is coated on one surface of the base film through a scraper coating mechanism, the thickness of the resin material layer is 1mm-5mm, and then the resin material layer is baked through a first baking oven to solidify the surface of the resin material layer and form a protective layer, and the resin material clamped between the protective layer and the base film forms a gel state;

[0009] 2) The product in step 1) is continuously punched through a punching mechanism, so that a plurality of through holes in a matrix distribution are formed on the resin material layer, and the through holes penetrate through the resin material layer and the base film;

[0010] 3) The bottom film in a roll structure is unwound and conveyed through a bottom film unwinding roller, and the bottom film is compounded on the other surface of the base film, so that one end of the through hole is closed;

[0011] 4) The ink is coated on the resin material layer through a pattern forming mechanism, so that the ink seeps into the resin material layer in a gel state through the through hole and mixes with the resin material layer, and the excess ink is stored in the through hole to form a heat transfer printing film;

[0012] 5) The two sides of the heat transfer printing film are preheated respectively through a preheating mechanism, so that the resin material layer is softened;

[0013] 6) The resin product is conveyed to the second baking oven through the belt input conveying mechanism, and then the resin product on the belt input conveying mechanism is transferred to the heat transfer printing station in the second baking oven through a mechanical hand, and the resin product is clamped through a clamping mechanism, and the heat transfer printing film is transferred into the second baking oven, and the resin product and the heat transfer printing film are heated through the second baking oven;

[0014] 7) through the image recognition system to obtain the surface of the resin product image, and identify the convex area of the resin product surface, the concave area and the plane area, and then control the pressing mechanism to shift to the concave area first, push the hot transfer film to attach to the concave area of the resin product, and apply pressure to make the resin material layer on the hot transfer film composite on the surface of the resin product, and then control the pressing mechanism to shift to the convex area, push the hot transfer film to attach to the concave area of the resin product, and apply pressure to make the resin material layer on the hot transfer film composite on the surface of the resin product, and finally control the pressing mechanism to shift to the plane area, push the hot transfer film to attach to the concave area of the resin product, and apply pressure to make the resin material layer on the hot transfer film composite on the surface of the resin product, so that the ink is fused into the resin material layer and the resin product;

[0015] 8) tear the base film and the bottom film, and transfer the resin product at the hot transfer position to the belt output conveying mechanism by the mechanical hand.

[0016] Further, in the above step 7), the image recognition system comprises a controller, an industrial camera, a position sensor provided on the pressing mechanism, an input device, the industrial camera and the position sensor are electrically connected with the input end of the controller, the pressing mechanism and the clamping mechanism are electrically connected with the output end of the controller, and the working mode of the image recognition system comprises the following steps:

[0017] a, the controller controls the clamping mechanism to clamp the resin product;

[0018] b, the initial position of the pressing mechanism is determined in advance through the input device, and the position of the pressing mechanism is obtained through the position sensor, and then the pressing mechanism is controlled to return to the initial position;

[0019] c, the controller controls the industrial camera to shoot the surface of the resin product, and transmits the shooting data to the controller;

[0020] d, the controller constructs the wheel corridor of the resin product and identifies the convex area, the concave area and the plane area on the surface of the resin product through the shooting data, and determines the priority level of the pressing area of the pressing mechanism, which is the concave area, the convex area and the plane area in turn.

[0021] Further, in the above step 1), the temperature in the first oven is 70-105℃.

[0022] Further, in the above step 4), the resin material layer in the hot transfer film comprises EVA resin 55%, ink 15%, paraffin 26% and auxiliary agent 4%.

[0023] Further, the resin product surface heat transfer printing process adopts a heat transfer device for processing, the heat transfer device comprises a rack, a control system, an image recognition system, a base film unwinding roller, a scraper coating mechanism, a first oven, a punching mechanism, a bottom film unwinding roller, a pattern forming mechanism, a preheating mechanism, a belt input conveying mechanism, a second oven, a mechanical hand, a clamping mechanism, a pressing mechanism, a belt output conveying mechanism and a winding roller, the scraper coating mechanism is arranged at the output end of the base film unwinding roller, the first oven is arranged at the output end of the scraper coating mechanism, the punching mechanism is arranged at the output end of the first oven, the pattern forming mechanism is arranged at the output end of the punching mechanism and the bottom film unwinding roller, the preheating mechanism is arranged at the output end of the pattern forming mechanism, the mechanical hand is arranged at the output end of the belt input conveying mechanism, the second oven is arranged at the output end of the mechanical hand and the preheating mechanism, the second oven has a heat transfer station in it, the clamping mechanism is arranged on the heat transfer station, the image recognition system and the pressing mechanism are arranged in the second oven and located on the side of the heat transfer station, the belt output conveying mechanism is arranged at the output end of the mechanical hand and the second oven, the winding roller is arranged at the output end of the second oven, and the base film unwinding roller, the scraper coating mechanism, the first oven, the punching mechanism, the bottom film unwinding roller, the pattern forming mechanism, the preheating mechanism, the belt input conveying mechanism, the second oven, the mechanical hand, the belt output conveying mechanism and the winding roller are electrically connected with the control system respectively, and the clamping mechanism and the pressing mechanism are electrically connected with the control system through the image recognition system.

[0024] Further, the preheating mechanism comprises a driving motor, a fan, a preheating roller, a plurality of heating pipes, an upper cover body, a lower cover body, an upper driving cylinder and a lower driving cylinder, the preheating roller has a transmission area and a preheating area, the preheating area of the preheating roller is provided with air permeable holes, the preheating roller is provided with an air outlet, the preheating roller is provided with a flow channel communicating the air permeable holes and the air outlet, the transmission area of the preheating roller is rotatably arranged on the rack through a first bearing, the driving motor is drivingly connected with the preheating roller, each heating pipe is distributed on the side of the preheating roller, a material channel is formed between each heating pipe and the preheating roller, the upper cover body and the lower cover body are respectively arranged on the upper side and the lower side of the preheating roller, the upper driving cylinder is connected with the upper cover body, the lower driving cylinder is connected with the lower cover body, the upper cover body is provided with an inlet and a first air inlet, the lower cover body is provided with an outlet and a second air inlet, the opening and closing of the upper cover body and the lower cover body are respectively driven by the upper driving cylinder and the lower driving cylinder, when the upper cover body and the lower cover body are closed, the preheating area of the preheating roller is distributed in the upper cover body and the lower cover body, the fan is connected with the first air inlet, the second air inlet and the air outlet through an air pipe, and the material channel is connected with the inlet and the outlet respectively.

[0025] Further, the preheating roller comprises a rotating shaft, a roller body, a first sleeve and a second sleeve, the roller body is sleeved on the preheating area of the rotating shaft through a second bearing, the first sleeve is fixedly sleeved on the roller body, a first air cavity is formed between the first sleeve and the roller body, the air outlet is arranged on the first sleeve, the second sleeve is sleeved on the first sleeve and located on one axial side of the first sleeve, one end of the second sleeve close to the preheating area is locked on the rotating shaft through bolts, a second air cavity is formed between the second sleeve and the first sleeve, the first sleeve is provided with a connecting hole communicating the first air cavity and the second air cavity, the first air cavity, the connecting hole and the second air cavity constitute a flow channel, and the air permeable holes are arranged on the second sleeve.

[0026] Further, a plurality of partitions are arranged in the upper cover body and the lower cover body along the radial direction of the preheating roller, so as to divide the heating pipe into a plurality of heating areas.

[0027] Further, the upper cover body is provided with a first air guide plate in an arc structure, the concave surface of the first air guide plate faces the preheating roller, and the first air guide plate is provided with a first air guide opening communicating with each heating area in the upper cover body.

[0028] Further, the lower cover body is provided with a second air guide plate in an arc structure, the concave surface of the second air guide plate faces the preheating roller, and the second air guide plate is provided with a second air guide opening communicating with each heating area in the lower cover body.

[0029] By adopting the foregoing technical scheme, the beneficial effects of the present application are as follows: the resin product surface heat transfer printing process coats a resin material layer on a base film by taking the base film as a carrier, and solidifies the surface through drying to form a protective layer. The resin material layer is provided with through holes through punching, and the through holes are sealed by a composite bottom film. The ink is coated on the resin material layer, so that the ink is fused with the area in the gel state in the resin material layer, and then the heat transfer film carries the pattern ink. The heat transfer film is preheated, so that the protective layer of the heat transfer film is softened while keeping the internal gel state. In the subsequent second baking oven, the surface of the resin product is heated and softened, and the heat transfer film is further heated, so that it is press-combined with the resin product to form a molten state on the surface of the resin product, and is fixedly integrated with the resin product. The ink in the resin material layer is fused with the resin material in the molten state, and forms an integrated structure after cooling. The pattern has good wear resistance, and the ink is inside the resin product, which can present a relatively three-dimensional structure, and prevent the pattern from being distorted and blurred during the transfer process, thereby improving the aesthetic appearance. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structure schematic diagram of a heat transfer printing device in the embodiment of the present application.

[0031] Figure 2 is a front view structural schematic diagram of the preheating mechanism in the embodiment of the present application;

[0032] Figure 3 is a sectional view structural schematic diagram of the preheating mechanism in the embodiment of the present application;

[0033] Figure 4 is a sectional view structural schematic diagram of the preheating roller in the embodiment of the present application;

[0034] Figure 5 is a front view structural schematic diagram of the pressing mechanism in the embodiment of the present application;

[0035] Figure 6 is a left view structural schematic diagram of the support seat, support shaft, mounting frame and first compression roller in the embodiment of the present application;

[0036] Figure 7 is a top view structural schematic diagram of the support frame, swing frame, first compression roller and second compression roller in the embodiment of the present application;

[0037] Figure 8 is a circuit module diagram of the embodiment of the present application.

[0038] Legend of reference signs:

[0039] 1, base film unwinding roller; 2, doctor blade coating mechanism; 3, first baking oven; 4, punching mechanism; 5, bottom film unwinding roller; 6, pattern forming mechanism; 7, preheating mechanism; 8, belt input conveying mechanism; 9, second baking oven; 10, manipulator; 11, clamping mechanism; 13, image recognition system; 14, pressing mechanism; 15, belt output conveying mechanism; 16, winding roller; 17, first bearing; 18, second bearing; 20, control system;

[0040] 71, driving motor; 72, fan; 73, preheating roller; 74, heating pipe; 75, upper cover body; 76, lower cover body; 77, upper driving air cylinder; 78, lower driving air cylinder; 79, inlet; 80, first air inlet; 81, outlet; 82, second air inlet; 83, air outlet; 84, air hole; 85, partition plate; 86, first air guide plate; 87, first air guide inlet; 88, second air guide plate; 89, second air guide inlet; 91, heat transfer printing station;

[0041] 101, transmission zone; 102, preheating zone; 103, flow channel; 104, material channel;

[0042] 131, controller; 132, industrial camera; 133, position sensor; 134, input device;

[0043] 141, first driving cylinder; 142, second driving cylinder; 143, third driving cylinder; 144, lifting cylinder; 145, rotary motor; 146, first guide assembly; 147, second guide assembly; 148, support shaft; 149, first moving seat; 150, second moving seat; 151, support seat; 152, connecting seat; 153, mounting frame; 154, swing frame; 155, return spring; 156, first compression roller; 157, second compression roller;

[0044] 731, rotating shaft; 732, roller body; 733, first sleeve; 734, second sleeve; 735, first air cavity; 736, second air cavity; 737, connecting hole. DETAILED DESCRIPTION

[0045] The application will be further described in conjunction with the drawings and specific embodiments.

[0046] Embodiments of the application are:

[0047] Reference Figure 1 With Figure 8 As shown in the drawings, a resin product surface thermal transfer printing process comprises the following steps:

[0048] 1) The base film in a roll structure is unwound and conveyed by a base film unwinding roller 1, and a layer of resin material is coated on one surface of the base film by a doctor blade coating mechanism 2, the thickness of the resin material layer is 1mm-5mm, preferably 4mm, and the resin material layer is then baked by a first baking oven 3 to solidify the surface of the resin material layer and form a protective layer, and the resin material clamped between the protective layer and the base film forms a gel state, the temperature in the first baking oven 3 is 70-105°C, preferably 85°C;

[0049] 2) The product in step 1) is continuously punched by a punching mechanism 4 to form a plurality of through holes in a matrix distribution on the resin material layer, the through holes penetrating the resin material layer and the base film;

[0050] 3) The bottom film in a roll structure is unwound and conveyed by a bottom film unwinding roller 5, and the bottom film is compounded on the other surface of the base film to close one end of the through hole;

[0051] 4) The ink is coated on the resin material layer by a pattern forming mechanism 6, so that the ink seeps into the resin material layer in a gel state through the through hole and mixes with the resin material layer, and the excess ink is stored in the through hole to form a thermal transfer film;

[0052] 5) The two sides of the thermal transfer film are respectively preheated by a preheating mechanism 7 to soften the resin material layer;

[0053] 6) The resin product is transported to the second baking oven 9 by the belt input conveying mechanism 8, and the resin product on the belt input conveying mechanism 8 is transferred to the hot transfer position 91 in the second baking oven 9 by the mechanical hand 10, and the resin product is clamped by the clamping mechanism 11, and the hot transfer film is transferred into the second baking oven 9, and the resin product and the hot transfer film are heated by the second baking oven 9;

[0054] 7) The image recognition system 13 obtains the image of the surface of the resin product, and identifies the convex region, the concave region and the flat region on the surface of the resin product, and then controls the pressing mechanism 14 to transfer to the concave region first, pushes the hot transfer film to adhere to the concave region of the resin product, and applies pressure to make the resin material layer on the hot transfer film composite on the surface of the resin product, then controls the pressing mechanism 14 to transfer to the convex region, pushes the hot transfer film to adhere to the concave region of the resin product, and applies pressure to make the resin material layer on the hot transfer film composite on the surface of the resin product, and finally controls the pressing mechanism 14 to transfer to the flat region, pushes the hot transfer film to adhere to the concave region of the resin product, and applies pressure to make the resin material layer on the hot transfer film composite on the surface of the resin product, so that the ink is fused into the resin material layer and the resin product;

[0055] 8) The base film and the bottom film are torn off, and the resin product at the hot transfer position 91 is transferred to the belt output conveying mechanism 15 by the mechanical hand 10.

[0056] The base film and the bottom film are PET films.

[0057] The resin product surface hot transfer process uses the base film as a carrier, coats the resin material layer on the base film, and dries it to solidify the surface and form a protective layer. The resin material layer is provided with through holes by punching, and the bottom film is used to block the through holes. The ink is coated on the resin material layer to fuse the ink with the area in the gel state in the resin material layer, and then the hot transfer film carries the pattern ink. The hot transfer film is preheated to soften the protective layer while maintaining the internal gel state. In the subsequent second baking oven 9, the surface of the resin product is heated and softened, and the hot transfer film is further heated to press and composite on the resin product, forming a molten state on the surface of the resin product, and being fixed and integrated with the resin material layer. The ink in the resin material layer is fused with the resin material in the molten state, and after cooling, an integrated structure is formed, which has good wear resistance and good appearance, and the ink is inside the resin product, which can present a more three-dimensional structure, and prevent pattern distortion and blur during transfer, improve the appearance.

[0058] And, in the step 7), the image recognition system 13 comprises a controller 131, an industrial camera 132, a position sensor 133 arranged on the pressing mechanism 14, and an input device 134, the industrial camera 132 and the position sensor 133 are electrically connected to the input end of the controller 131, the pressing mechanism 14 and the clamping mechanism 11 are electrically connected to the output end of the controller 131, and the working mode of the image recognition system 13 comprises the following steps:

[0059] a. The controller controls the clamping mechanism 11 to clamp the resin product;

[0060] b. The initial position of the pressing mechanism 14 is determined in advance through the input device 134, the position of the pressing mechanism 14 is obtained through the position sensor 133, and the pressing mechanism 14 is controlled to return to the initial position;

[0061] c. The controller 131 controls the industrial camera 132 to shoot the surface of the resin product and transmits the shooting data to the controller;

[0062] d. The controller 131 constructs the wheel corridor of the resin product through the shooting data, identifies the convex region, the concave region and the flat region on the surface of the resin product, and determines the priority level of the pressing region of the pressing mechanism 14, which is the concave region, the convex region and the flat region in turn.

[0063] By setting the working mode of the pattern recognition system, the convex part and the concave part on the surface of the resin product are easily identified, and then the pressing mechanism 14 is controlled to press the convex region, the concave region and the flat region of the resin product in turn, so that the heat transfer film is closely attached to the surface of the resin product, and the ink on the heat transfer film can be accurately attached to the surface of the resin product and fused with it during the pressing and fusion process, presenting a clear and three-dimensional pattern, avoiding pattern distortion and improving the aesthetic appearance.

[0064] Meanwhile, in the step 4), the resin material layer of the heat transfer film comprises 55% of EVA resin, 15% of ink, 26% of paraffin and 4% of auxiliary agent, so that the resin material layer can be better attached to the resin product and the base film, improving the transfer effect.

[0065] In this embodiment, reference is made to Figure 1As shown, the resin product surface heat transfer printing process is treated by a heat transfer device, which comprises a rack, a control system 20, an image recognition system 13, a base film unwinding roller 1, a doctor blade coating mechanism 2, a first baking oven 3, a punching mechanism 4, a bottom film unwinding roller 5, a pattern forming mechanism 6, a preheating mechanism 7, a belt input conveying mechanism 8, a second baking oven 9, a mechanical hand 10, a clamping mechanism 11, a pressing mechanism 14, a belt output conveying mechanism 15 and a winding roller 16. The doctor blade coating mechanism 2 is arranged at the output end of the base film unwinding roller 1, the first baking oven 3 is arranged at the output end of the doctor blade coating mechanism 2, the punching mechanism 4 is arranged at the output end of the first baking oven 3, the pattern forming mechanism 6 is arranged at the output end of the punching mechanism 4 and the bottom film unwinding roller 5, the preheating mechanism 7 is arranged at the output end of the pattern forming mechanism 6, the mechanical hand 10 is arranged at the output end of the belt input conveying mechanism 8, the second baking oven 9 is arranged at the output end of the mechanical hand 10 and the preheating mechanism 7, the second baking oven 9 has a heat transfer station 91 inside, the clamping mechanism 11 is arranged on the heat transfer station 91, the image recognition system 13 and the pressing mechanism 14 are arranged inside the second baking oven 9 and located at the side of the heat transfer station 91, the belt output conveying mechanism 15 is arranged at the output end of the mechanical hand 10 and the second baking oven 9, and the winding roller 16 is arranged at the output end of the second baking oven 9. The base film unwinding roller 1, the doctor blade coating mechanism 2, the first baking oven 3, the punching mechanism 4, the bottom film unwinding roller 5, the pattern forming mechanism 6, the preheating mechanism 7, the belt input conveying mechanism 8, the second baking oven 9, the mechanical hand 10, the belt output conveying mechanism 15 and the winding roller 16 are respectively electrically connected with the control system 20, and the clamping mechanism 11 and the pressing mechanism 14 are electrically connected with the control system 20 through the image recognition system 13.

[0066] In particular, referring to Figure 2 、 Figure 3 and Figure 4The preheating mechanism 7 comprises a driving motor 71, a fan 72, a preheating roller 73, a plurality of heating pipes 74, an upper cover 75, a lower cover 76, an upper driving cylinder 77 and a lower driving cylinder 78. The preheating roller 73 has a transmission zone 101 and a preheating zone 102. The preheating zone 102 of the preheating roller 73 is provided with air permeable holes 84. An air outlet 83 is arranged on the preheating roller 73. A flow channel 103 is arranged on the preheating roller 73 and communicates the air permeable holes 84 and the air outlet 83. The transmission zone 101 of the preheating roller 73 is rotatably arranged on the frame through a first bearing 17. The driving motor 71 is drivingly connected with the preheating roller 73. Each of the heating pipes 74 is distributed on the circumferential side of the preheating roller 73. Each of the heating pipes 74 and the preheating roller 73 forms a material channel 104. The upper cover 75 and the lower cover 76 are arranged on the upper side and the lower side of the preheating roller 73 respectively. The upper driving cylinder 77 is connected with the upper cover 75. The lower driving cylinder 78 is connected with the lower cover 76. An inlet 79 and a first air inlet 80 are arranged on the upper cover 75. An outlet 81 and a second air inlet 82 are arranged on the lower cover 76. The upper cover 75 and the lower cover 76 are driven to open and close by the upper driving cylinder 77 and the lower driving cylinder 78 respectively. When the upper cover 75 and the lower cover 76 are closed, the preheating zone of the preheating roller 73 is distributed in the upper cover 75 and the lower cover 76. The fan 72 is connected with the first air inlet 80, the second air inlet 82 and the air outlet 83 through air pipes. The material channels 104 are connected with the inlet 79 and the outlet 81 respectively. The preheating roller 73 comprises a rotating shaft 731, a roller body 732, a first sleeve 733 and a second sleeve 734. The roller body 732 is sleeved on the preheating zone 102 of the rotating shaft 731 through a second bearing 18. The first sleeve 733 is fixedly sleeved on the roller body 732 and forms a first air cavity 735 between the first sleeve 733 and the roller body 732. The air outlet 83 is arranged on the first sleeve 733. The second sleeve 734 is sleeved on the first sleeve 733 and located on one axial side of the first sleeve 733. One end of the second sleeve 734 close to the preheating zone 102 is locked on the rotating shaft 731 through bolts. The second sleeve 734 forms a second air cavity 736 between the second sleeve 734 and the first sleeve 733. The first sleeve 733 is provided with a connecting hole 737 communicating the first air cavity 735 and the second air cavity 736. The first air cavity 735, the connecting hole 737 and the second air cavity 736 constitute the flow channel 103. The air permeable holes 84 are arranged on the second sleeve 734.

[0067] The air in the upper cover 75, the lower cover 76 and the flow channel 103 in the preheating roller 73 forms an internal circulation flow by the operation of the fan 72, and the air is heated by flowing through the heating pipe 74, and then acts on the outer surface of the heat transfer printing film and the preheating roller 73, and then contacts the inner surface of the heat transfer printing film through the preheating roller 73, so that the protective layer on the resin material layer is softened and kept in a gel state, which is beneficial to the subsequent heat transfer printing composite with the resin product. Specifically, the heat transfer printing film is wound on the preheating roller 73, the preheating roller 73 is driven to rotate by the driving motor 71, so as to drive the conveying of the heat transfer printing film, and the fan 72 is started, which extracts the air in the upper cover 75 and the lower cover 76, and then fills the space formed by the upper cover 75 and the lower cover 76 through the first air inlet 80 and the second air inlet 82. The space is heated by the heating pipe 75, so that the air carries heat, a part of the air acts on the outer surface of the heat transfer printing film, and another part of the air enters the second air cavity 736 through the air holes 84 on the second sleeve pipe 734, and heats the second sleeve pipe 734, so as to heat the heat transfer printing film wound on the second sleeve pipe 734. This structure can form a temperature difference between the outer surface and the inner surface of the heat transfer printing film, which is beneficial to the transfer of the resin material layer on the heat transfer printing film on the base film, and is beneficial to the rapid fusion of the ink and the resin material layer, so as to form a more uniform color presentation and improve the transfer effect.

[0068] Further, a plurality of partitions 85 are arranged in the radial direction of the preheating roller in the upper cover 75 and the lower cover 76, the heating pipe 75 is divided into a plurality of heating areas, the first air guide plate 86 in an arc structure is arranged in the upper cover 75, the concave surface of the first air guide plate 86 faces the preheating roller 73, the first air guide plate 86 is provided with the first air inlet 87 which communicates with each heating area in the upper cover 75, the second air guide plate 88 in an arc structure is arranged in the lower cover 76, the concave surface of the second air guide plate 88 faces the preheating roller 73, and the second air guide plate 88 is provided with the second air inlet 89 which communicates with each heating area in the lower cover 76, so as to avoid the air in the upper cover 75 and the lower cover 76 forming turbulent flow, ensure the uniformity of the flow, and make the heat of each area on the outer surface of the heat transfer printing film uniform, thereby ensuring good preheating effect of the heat transfer printing film.

[0069] In this embodiment, reference is made to Figure 5 , Figure 6 and Figure 7As shown, the pressing mechanism 14 comprises a first driving cylinder 141, a second driving cylinder 142, a third driving cylinder 143, a lifting cylinder 144, a rotary motor 145, a first guide assembly 146, a second guide assembly 147, a support shaft 148, a first moving base 149, a second moving base 150, a support base 151, a connecting base 152, a mounting frame 153, two swing frames 154, two reset springs 155, a first pressing roller 156 and two second pressing rollers 157. The first guide assembly 146 is arranged on the frame, the first moving base 149 is arranged on the first guide assembly 146, the first driving cylinder 141 is connected with the first moving base 149 to drive the first moving base 149 to reciprocate along the guide direction of the first guide assembly 146, the second guide assembly 147 is arranged on the first moving base 149, the second moving base 150 is arranged on the second guide assembly 147, the second driving cylinder 142 is connected with the second moving base 150 to drive the second moving base 150 to reciprocate along the guide direction of the second guide assembly 147, the guide direction of the first guide assembly 146 and the guide direction of the second guide assembly 147 are perpendicular to each other, the lifting cylinder 144 is arranged on the second moving base 150, the support base 151 is arranged on the upper end of the lifting cylinder 144, the support shaft 148 is rotatably arranged on the support base 151, the axial direction of the support shaft 148 is perpendicular to the guide direction of the first guide assembly 146, the rotary motor 146 is connected with the support shaft 148 to drive the support shaft 148 to rotate, the mounting frame 153 is fixedly arranged on the support shaft 148, the third driving cylinder 143 is fixedly arranged on the middle part of the mounting frame 153, the connecting base 152 is arranged on the free end of the third driving cylinder 143, the first pressing roller 156 is rotatably arranged on the connecting base 152, the two swing frames 154 are hingedly connected with the mounting frame 153 and are distributed on the two sides of the third driving cylinder 143, the included angle between the two swing frames 154 is 30°-60°, preferably 45°, the two second pressing rollers 157 are rotatably arranged on the free ends of the swing frames 154, and the two ends of the two reset springs 155 are connected with the swing frames 154 and the mounting frame 153 respectively.

[0070] When the hot transfer film is pressed on the concave area of the resin product, the first moving seat 149 is driven to move by the first driving cylinder 141, and then the first pressing roller 156 is moved to the front side of the concave area, and the hot transfer film is pressed in the concave area by the first pressing roller 156 driven by the third driving cylinder 143, and then the mounting frame 153 is driven to move towards the resin product by the second driving cylinder 142, so that the two second pressing rollers 157 press the two sides of the first pressing roller 156, and the mounting frame 153 is continuously fed, and the first pressing roller 156 is retracted by the second driving cylinder 142, so that the first pressing roller 156 always abuts against the concave area of the resin product, so that the second pressing roller 157 swings outward to press and flatten the hot transfer film, and the movement of the mounting frame is repeatedly driven, so that the hot transfer film is compounded on the surface of the resin product, and the hot transfer effect is improved.

[0071] The control system 20 is a PLC controller sold on the market and capable of playing a control role; the scraper coating mechanism 2, the first baking oven 3, the punching mechanism 4, the pattern forming mechanism 6, the second baking oven 9, the mechanical hand 10 and the clamping mechanism 11 are all prior art, and will not be described in detail here; the first baking oven 3 and the second baking oven 9 can also be baking temperature ovens.

[0072] Although the present application is specifically shown and described in connection with preferred embodiments, it should be understood by those skilled in the art that various changes in form and details can be made to the present application without departing from the spirit and scope of the present application as defined in the appended claims, and all such changes are intended to be within the protection scope of the present application.

Claims

1. A process for heat transfer printing onto a surface of a resin article, characterized by: The method comprises the following steps: 1) unwinding the base film in a roll structure through a base film unwinding roller, coating a layer of resin material on one surface of the base film through a doctor blade coating mechanism, the thickness of the resin material layer being 1-5 mm, baking the resin material layer through a first baking oven to solidify the surface of the resin material layer and form a protective layer, and the resin material sandwiched between the protective layer and the base film being in a gel state; 2) continuously punching the product in step 1) through a punching mechanism to form a plurality of matrix-distributed through holes in the resin material layer, the through holes penetrating through the resin material layer and the base film; 3) unwinding the bottom film in a roll structure through a bottom film unwinding roller, and laminating the bottom film on the other surface of the base film to close one end of the through holes; 4) coating ink on the resin material layer through a pattern forming mechanism, allowing the ink to infiltrate into the resin material layer in a gel state through the through holes and mix with the resin material layer, and storing the excess ink in the through holes to form a thermal transfer film; 5) preheating the two sides of the thermal transfer film through a preheating mechanism to soften the resin material layer; 6) conveying the resin product to a second baking oven through a belt input conveying mechanism, transferring the resin product on the belt input conveying mechanism to a thermal transfer station in the second baking oven through a mechanical hand, clamping the resin product through a clamping mechanism, and transferring the thermal transfer film into the second baking oven, and heating the resin product and the thermal transfer film through the second baking oven; 7) acquiring the image of the surface of the resin product through an image recognition system, identifying the raised area, the recessed area and the flat area on the surface of the resin product, and controlling the pressing mechanism to preferentially transfer to the recessed area, pushing the thermal transfer film to adhere to the recessed area of the resin product and applying pressure to make the resin material layer on the thermal transfer film laminated on the surface of the resin product, then controlling the pressing mechanism to transfer to the raised area, pushing the thermal transfer film to adhere to the recessed area of the resin product and applying pressure to make the resin material layer on the thermal transfer film laminated on the surface of the resin product, and finally controlling the pressing mechanism to transfer to the flat area, pushing the thermal transfer film to adhere to the recessed area of the resin product and applying pressure to make the resin material layer on the thermal transfer film laminated on the surface of the resin product, so that the ink is fused into the resin material layer and the resin product; 8) tearing the base film and the bottom film, and transferring the resin product at the thermal transfer station to a belt output conveying mechanism through a mechanical hand.

2. The process of heat transfer printing onto a surface of a resin article according to claim 1, characterized in that: In the above step 7), the image recognition system comprises a controller, an industrial camera, a position sensor provided on the pressing mechanism, and an input device, the industrial camera and the position sensor being electrically connected to the input end of the controller, and the pressing mechanism and the clamping mechanism being electrically connected to the output end of the controller, and the working mode of the image recognition system comprising the following steps: a. The controller controls the clamping mechanism to clamp the resin product; b. The initial position of the pressing mechanism is determined in advance through the input device, the position of the pressing mechanism is acquired through the position sensor, and the pressing mechanism is controlled to return to the initial position. c. The controller controls the industrial camera to take pictures of the surface of the resin product and transmits the picture data to the controller. d. The controller constructs the wheel gallery of the resin product through the picture data and identifies the convex region, the concave region and the flat region on the surface of the resin product, and determines the priority level of the pressing region of the pressing mechanism, which is the concave region, the convex region and the flat region in turn.

3. The process of heat transfer printing onto a surface of a resin article according to claim 2, characterized in that: In the above step 1), the temperature in the first oven is 70-105℃.

4. The process of heat transfer printing onto a surface of a resinous article according to claim 2, wherein: In the above step 4), the resin material layer in the thermal transfer film comprises 55% EVA resin, 15% ink, 26% paraffin and 4% auxiliary agent.

5. The process according to any one of claims 1 to 4, wherein: The resin product surface thermal transfer process adopts a thermal transfer device for processing, which comprises a rack, a control system, an image recognition system, a base film unwinding roller, a scraper coating mechanism, a first oven, a punching mechanism, a bottom film unwinding roller, a pattern forming mechanism, a preheating mechanism, a belt input conveying mechanism, a second oven, a mechanical hand, a clamping mechanism, a pressing mechanism, a belt output conveying mechanism and a winding roller. The scraper coating mechanism is arranged at the output end of the base film unwinding roller, the first oven is arranged at the output end of the scraper coating mechanism, the punching mechanism is arranged at the output end of the first oven, the pattern forming mechanism is arranged at the output end of the punching mechanism and the bottom film unwinding roller, the preheating mechanism is arranged at the output end of the pattern forming mechanism, the mechanical hand is arranged at the output end of the belt input conveying mechanism, the second oven is arranged at the output end of the mechanical hand and the preheating mechanism, the second oven has a thermal transfer station inside, the clamping mechanism is arranged on the thermal transfer station, the image recognition system and the pressing mechanism are arranged in the second oven and located at the side of the thermal transfer station, the belt output conveying mechanism is arranged at the output end of the mechanical hand and the second oven, the winding roller is arranged at the output end of the second oven, and the base film unwinding roller, the scraper coating mechanism, the first oven, the punching mechanism, the bottom film unwinding roller, the pattern forming mechanism, the preheating mechanism, the belt input conveying mechanism, the second oven, the mechanical hand, the belt output conveying mechanism and the winding roller are respectively electrically connected with the control system, and the clamping mechanism and the pressing mechanism are electrically connected with the control system through the image recognition system.

6. The process of heat transfer printing onto a surface of a resinous article according to claim 5, wherein: The preheating mechanism comprises a driving motor, a fan, a preheating roller, a plurality of heating pipes, an upper cover body, a lower cover body, an upper driving cylinder and a lower driving cylinder, the preheating roller has a transmission zone and a preheating zone, the preheating zone of the preheating roller is provided with air permeable holes, the preheating roller is provided with an air outlet, the preheating roller is provided with a flow channel communicating the air permeable holes and the air outlet, the transmission zone of the preheating roller is rotatably arranged on a rack through a first bearing, the driving motor is drivingly connected with the preheating roller, each of the heating pipes is distributed on the circumferential side of the preheating roller, a material channel is formed between each of the heating pipes and the preheating roller, the upper cover body and the lower cover body are arranged on the upper side and the lower side of the preheating roller respectively, the upper driving cylinder is connected with the upper cover body, the lower driving cylinder is connected with the lower cover body, the upper cover body is provided with an inlet and a first air inlet, the lower cover body is provided with an outlet and a second air inlet, the upper cover body and the lower cover body are driven to open and close by the upper driving cylinder and the lower driving cylinder respectively, when the upper cover body and the lower cover body are closed, the preheating zone of the preheating roller is distributed in the upper cover body and the lower cover body, the fan is connected with the first air inlet, the second air inlet and the air outlet through an air pipe, and the material channel is connected with the inlet and the outlet respectively.

7. The process of heat transfer printing onto a surface of a resinous article according to claim 6, wherein: The preheating roller comprises a rotating shaft, a roller body, a first sleeve and a second sleeve, the roller body is sleeved on the preheating zone of the rotating shaft through a second bearing, the first sleeve is fixedly sleeved on the roller body, a first air cavity is formed between the first sleeve and the roller body, the air outlet is arranged on the first sleeve, the second sleeve is sleeved on the first sleeve and located on one axial side of the first sleeve, one end of the second sleeve close to the preheating zone is locked on the rotating shaft through a bolt, a second air cavity is formed between the second sleeve and the first sleeve, the first sleeve is provided with a connecting hole communicating the first air cavity and the second air cavity, and the first air cavity, the connecting hole and the second air cavity constitute the flow channel, and the air permeable holes are arranged on the second sleeve.

8. The process of heat transfer printing onto a surface of a resin article according to claim 7, characterized in that: A plurality of partitions are arranged in the upper cover body and the lower cover body along the radial direction of the preheating roller, so as to separate the heating pipes into a plurality of heating areas.

9. The process of heat transfer printing onto a surface of a resinous article according to claim 8, characterized in that: An arc-shaped first air guide plate is arranged in the upper cover body, the concave surface of the first air guide plate faces the preheating roller, and the first air guide plate is provided with a first air guide opening communicating each of the heating areas in the upper cover body.

10. The process of heat transfer printing onto a surface of a resin article according to claim 9, characterized in that: An arc-shaped second air guide plate is arranged in the lower cover body, the concave surface of the second air guide plate faces the preheating roller, and the second air guide plate is provided with a second air guide opening communicating each of the heating areas in the lower cover body.

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