Transfer printing mold suitable for special-shaped products

Abstract

The utility model discloses a transfer printing mould suitable for special-shaped products, which relates to the technical field of moulds and comprises a male mould and a female mould, a mould core is arranged on a mould closing surface of the male mould, a mould cavity matched with the mould core in shape is arranged on a mould closing surface of the female mould, and a foil film is arranged between the male mould and the female mould. Two first pressing frames which are horizontally arranged in the front-back direction are fixedly connected to the two ends of the female die in a locked mode respectively, a guide roller is arranged below each first pressing frame, and two second pressing frames which are horizontally arranged in the left-right direction are fixedly connected between the two first pressing frames in a locked mode; each second pressing frame comprises a connecting part which is fixedly locked and connected with the two first pressing frames and an arc-shaped part which is matched with the curvature of the cavity of the female mold; and a plurality of rolling units which are used for assisting the foil film to slide in the cavity are arranged on the opposite surfaces of the two arc-shaped parts. According to the utility model, the problem that a foil film cannot be attached when a traditional mold is used for transfer printing on a complex curved surface is effectively solved, the resolution ratio of a transfer printing pattern is remarkably improved, the risk that the foil film is broken is reduced, and the transfer printing efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a transfer mold suitable for irregularly shaped products. Background Technology

[0002] Current IMR (In-Mold Transfer) technology generally employs a rigid mold structure, and its transfer process relies on the perfect fit between the mold cavity and the foil. In conventional implementations, the mold surface is typically designed as a flat surface or a small-radius surface in a single direction, such as the flat decorative area of ​​a mobile phone casing or the shallow curved surface of a home appliance button. The mold has feeding mechanisms on both sides to deliver the foil into the mold cavity. After the foil is heated and softened, it is evenly spread on the cavity surface through the mechanical pressing action of the mold, thus ensuring that the pattern transfer is completed after the ink layer cures. This type of structure is suitable for products with gentle surface curvature and simple geometric features, such as the casing of flat electronic devices or regular cylindrical parts.

[0003] However, for product surfaces with large curvature, the existing rigid contact mechanism between the mold and the foil has significant drawbacks. For example, in the application of curved frames in smart wearable devices, the abrupt curvature change in the mold cavity that matches the product shape prevents the foil from fully adhering. After the foil is fed in by the film feeding mechanism, due to the stretching limitation of the foil, the foil cannot make sufficient contact with the abrupt curvature change area when the mold is closed, and foil breakage may even occur. This not only leads to a decrease in the resolution and blurring of the transfer pattern, but also reduces the transfer efficiency.

[0004] In view of this, the inventor conducted in-depth research on the above-mentioned problems, which led to the creation of this case. Utility Model Content

[0005] This utility model provides a transfer mold suitable for irregularly shaped products, aiming to solve the problem that in existing transfer molds, the foil cannot fully contact the curvature change area of ​​the mold cavity after mold closing, or even the foil breaks.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A transfer mold suitable for irregularly shaped products includes a male mold and a female mold. The male mold has a core on its mating surface, and the female mold has a cavity on its mating surface that matches the shape of the core. A foil is provided between the male mold and the female mold. The two sides of the transfer mold are respectively provided with a foil feeding mechanism for unwinding the foil and a foil taking-up mechanism for rewinding the foil. With the length direction of the female mold as the left-right direction, two first pressure frames arranged horizontally in the front-back direction are locked to the left and right ends of the female mold. Each first pressure frame has a guide roller for guiding the foil below it. Two second pressure frames arranged horizontally in the left-right direction are locked to the two first pressure frames. Each second pressure frame includes a connecting part locked to the two first pressure frames and an arc-shaped part that matches the curvature of the cavity of the female mold. The opposite sides of the two arc-shaped parts are provided with multiple rolling units for assisting the foil to slide in the cavity.

[0008] Furthermore, the aforementioned rolling unit is a rolling bearing, and there is a gap between the bottom of the aforementioned rolling bearing and the aforementioned female mold.

[0009] Furthermore, each of the above-mentioned connecting parts is provided with a guide unit for the auxiliary foil to enter the cavity below.

[0010] Furthermore, the aforementioned guiding unit includes a mounting plate that is locked to the opposite sides of the two aforementioned second pressure frames. The mounting plate is provided with a rotatable guiding bearing and a guiding roller on the side facing the female mold, and there is a gap between the bottom of the aforementioned guiding bearing and the aforementioned female mold.

[0011] Furthermore, the top surfaces of both ends of the aforementioned master mold are recessed with grooves arranged in the front-to-back direction. Each groove is equipped with a rotating shaft, and multiple auxiliary bearings arranged at intervals along the length of the rotating shaft are rotatably mounted on the rotating shaft. The apex of the auxiliary bearings protrudes from the groove.

[0012] Furthermore, each of the aforementioned first pressure frames has two spaced-apart protrusions at its bottom, and the aforementioned guide roller is provided between the two protrusions.

[0013] As can be seen from the above description of the structure of this utility model, this utility model has the following advantages:

[0014] Firstly, the transfer mold of this utility model sets a first pressure frame and a second pressure frame on the master mold, wherein multiple rolling units are provided below the first pressure frame to ensure that the foil slides smoothly and fits tightly in the cavity. This effectively solves the problem that the foil cannot fit when transferring complex curved surfaces using traditional molds, significantly improves the resolution of the transfer pattern, reduces the risk of foil breakage, and greatly improves the transfer efficiency.

[0015] Secondly, by setting a guiding unit, this utility model can effectively guide the foil into the cavity, greatly reducing the friction of the foil, ensuring that the foil unfolds smoothly and evenly, avoiding the foil from twisting or breaking, and improving the stability of the foil during the transfer process.

[0016] Thirdly, the top surfaces at both ends of the master mold of this utility model are recessed with grooves, and each groove is equipped with a rotating shaft and multiple auxiliary bearings. The apex of the auxiliary bearing protrudes from the groove. In application, the auxiliary bearings effectively support and guide the foil to be transferred more smoothly during rotation, reducing friction and wear, preventing uneven spreading or damage of the foil during the transfer process, ensuring that the foil can be accurately positioned and move smoothly, thereby guaranteeing the quality and resolution of the final product. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a cross-sectional view of the present invention.

[0019] Figure 3 This is a schematic diagram of the core structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the cavity structure of this utility model.

[0021] Figure 5 This is the front view of the cavity of this utility model.

[0022] Figure 6 This is a schematic diagram of the structure of the present invention with the first and second pressure frames removed from one side.

[0023] Reference numerals: 10-male mold; 11-core; 12-gate; 20-female mold; 21-cavity; 22-first pressure frame; 221-convex plate; 222-guide roller; 23-second pressure frame; 231-connecting part; 232-arc-shaped part; 2321-accommodating groove; 24-rolling bearing; 25-groove; 251-rotating shaft; 252-auxiliary bearing; 31-mounting plate; 32-guide bearing; 33-guide roller. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0025] Reference Figures 1 to 5A transfer mold suitable for irregularly shaped products includes a male mold 10 and a female mold 20. The mating surface of the male mold 10 is provided with a core 11, and the mating surface of the female mold 20 is provided with a cavity 21 that matches the shape of the core 11. A foil (not shown in the figure) is provided between the male mold 10 and the female mold 20. A foil-laying mechanism (not shown in the figure) for unwinding the foil and a foil-rewinding mechanism (not shown in the figure) for rewinding the foil are respectively provided on both sides of the transfer mold. A gate 12 is provided at the top of the male mold 10. When injection molding material fills from the gate 12 into the molding space formed after the male mold 10 and the female mold 20 are closed and a plastic part is formed, the pattern on the foil is transferred to the plastic part. Taking the length direction of the female mold 20 as the left-right direction, the left and right ends of the female mold 20 are... Two first pressure frames 22 are locked together and arranged horizontally in the front-to-back direction. Each first pressure frame 22 has two spaced-apart protrusions 221 at its bottom. A guide roller 222 for guiding the foil is provided between the two protrusions 221. Two second pressure frames 23 are locked together and arranged horizontally in the left-to-right direction. Each second pressure frame 23 includes a connecting part 231 that is locked together with the two first pressure frames 22 and an arc-shaped part 232 that matches the curvature of the cavity 21 of the master mold 20. The opposite sides of the two arc-shaped parts 232 are provided with multiple rolling units for assisting the foil to slide in the cavity 21. In this embodiment, the rolling unit is a rolling bearing 24. There is a gap between the bottom of the rolling bearing 24 and the master mold 20.

[0026] During installation, the foil feeding mechanism delivers the foil film. The free end of the foil film, guided by the guide roller 222 below the first pressure frame 22 at one end of the master mold 20, enters the cavity 21 of the master mold 20. (Refer to...) Figure 2 As indicated by the middle arrow, the edge of the foil is now below the second pressure frame 23. As the foil continues to move, the rolling bearing 24 below the second pressure frame 23 allows the foil to slide smoothly within the cavity 21. Finally, the free end of the foil passes through the other end of the master mold 20 and wraps around the foil collection mechanism. During the transfer process, the foil collection mechanism moves the foil within the cavity 21 of the master mold 20. Furthermore, the presence of the first pressure frame 22 and the second pressure frame 23 allows the foil to adhere more tightly to the cavity 21, significantly improving the resolution of the transferred product. Unlike existing technologies that use mold closing followed by pressing to evenly spread the foil within the cavity 21, this solution reduces the risk of foil breakage and indirectly improves transfer efficiency.

[0027] It should be noted that the foil feeding mechanism and foil receiving mechanism are conventional components in the existing transfer printing field, so their structure and principle will not be described in detail, and they are not shown in the figure.

[0028] Reference Figures 1 to 5Each connecting part 231 has a guide unit below it for guiding the foil into the cavity 21. In this embodiment, the guide unit includes a mounting plate 31 locked to the opposite sides of the two second pressure frames 23. The mounting plate 31 has a rotatable guide bearing 32 and a guide roller 33 on the side facing the mother mold 20, and there is a gap between the bottom of the guide bearing 32 and the mother mold 20. In application, the guide unit can effectively guide the foil into the cavity 21, and by setting the rotatable guide bearing 32 and guide roller 33, the friction of the foil can be effectively reduced, ensuring that the foil unfolds smoothly and evenly, avoiding the foil from twisting or breaking. This not only improves the stability of the foil during the transfer process, but also improves the quality and resolution of the final product.

[0029] Reference Figures 1 to 6 The top surface of both ends of the master mold 20 is recessed with grooves 25 arranged in the front-back direction. Each groove 25 is equipped with a rotating shaft 251. Multiple auxiliary bearings 252 are rotatably mounted on the rotating shaft 251 and spaced apart along the length of the rotating shaft 251. The apex of each auxiliary bearing 252 protrudes from the groove 25. In application, the auxiliary bearings 252 can effectively support and guide the foil to be transferred more smoothly during rotation, reduce friction and wear, prevent uneven spreading or damage of the foil during the transfer process, significantly improve the stability of the transfer process, ensure the accurate positioning and smooth movement of the foil, and guarantee the quality and resolution of the final transferred product.

[0030] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A transfer mold suitable for irregularly shaped products, comprising a male mold and a female mold, wherein the mating surface of the male mold is provided with a core, the mating surface of the female mold is provided with a cavity that matches the shape of the core, a foil is provided between the male mold and the female mold, and a foil feeding mechanism for feeding the foil and a foil taking-up mechanism for taking up the foil are respectively provided on both sides of the transfer mold, characterized in that: With the length direction of the master mold as the left-right direction, two first pressure frames arranged horizontally in the front-back direction are locked to the left and right ends of the master mold respectively. Each first pressure frame is provided with a guide roller for guiding the foil film below. Two second pressure frames arranged horizontally in the left-right direction are locked to the two first pressure frames. Each second pressure frame includes a connecting part locked to the two first pressure frames and an arc-shaped part that matches the curvature of the master mold cavity. The opposite sides of the two arc-shaped parts are provided with multiple rolling units for assisting the foil film to slide in the cavity.

2. The transfer mold for irregularly shaped products according to claim 1, characterized in that: The rolling unit is a rolling bearing, and there is a gap between the bottom of the rolling bearing and the female mold.

3. The transfer mold for irregularly shaped products according to claim 1, characterized in that: Below each of the aforementioned connecting parts is a guide unit for the auxiliary foil to enter the cavity.

4. The transfer mold for irregularly shaped products according to claim 3, characterized in that: The guiding unit includes a mounting plate that is locked to the opposite sides of the two second pressure frames. The mounting plate is provided with a rotatable guiding bearing and a guiding roller on the side facing the female mold, and there is a gap between the bottom of the guiding bearing and the female mold.

5. The transfer mold for irregularly shaped products according to claim 1, characterized in that: The top surfaces at both ends of the master mold are recessed with grooves arranged in the front-to-back direction. Each groove is equipped with a rotating shaft, and multiple auxiliary bearings are rotatably mounted on the rotating shaft at intervals along the length of the rotating shaft. The apex of each auxiliary bearing protrudes from the groove.

6. The transfer mold for irregularly shaped products according to any one of claims 1 to 5, characterized in that: Each of the first pressure frames has two spaced-apart protrusions at its bottom, and the guide roller is located between the two protrusions.

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