In-mold transfer printing mold

Abstract

The utility model provides an in-mold transfer printing mold which comprises a first mold core, a second mold core, a third mold core and a fourth mold core. The second mold core is provided with a second surface corresponding to the first surface, and the second surface is connected with the first surface, so that the second mold core and the first mold core are closed to form a mold cavity; the pressing frame is arranged between the first mold core and the second mold core, the pressing frame is used for fixing the transfer printing film to the first face of the first mold core, and the pressing frame is opposite to the first sealing structure; the anti-wrinkle structure is arranged on the first mold core, the anti-wrinkle structure is closer to the mold cavity compared with the first sealing structure, the anti-wrinkle structure comprises a protruding part protruding out of the first face, the protruding part is provided with a first side face and a second side face which are opposite, and the first side face and the second side face are gradually away from each other from the top to the bottom of the protruding part; the first side face and the second side face are connected through a first arc face. By means of the in-mold transfer printing mold, the yield can be increased.

Description

Technical Field

[0001] The present disclosure relates to the field of mold technology, and in particular to an in-mold transfer mold. Background Art

[0002] In-mold transfer is a process to reduce the appearance of plastic products. A transfer film with a pattern is placed between the fixed mold and the movable mold. After the mold is closed, the plastic material is injected into the mold to transfer the pattern to the product surface. During the product molding process, the transfer film is prone to wrinkles on the product surface, affecting the product yield. Utility Model Content

[0003] The disclosed embodiment provides an in-mold transfer mold, which can improve the yield rate.

[0004] According to a first aspect of the present disclosure, there is provided an in-mold transfer mold, comprising:

[0005] A first mold core having a first surface, wherein the first surface has a first sealing structure;

[0006] A second mold core has a second surface corresponding to the first surface, the second surface is connected to the first surface, so that the second mold core and the first mold core are molded together to form a mold cavity;

[0007] A pressing frame is disposed between the first mold core and the second mold core, the pressing frame is used to fix the transfer film to the first surface of the first mold core, and the pressing frame is opposite to the first sealing structure;

[0008] An anti-wrinkle structure is arranged on the first mold core. The anti-wrinkle structure is closer to the mold cavity than the first sealing structure. The anti-wrinkle structure includes a protrusion protruding from the first surface. The protrusion has a first side surface and a second side surface opposite to each other. From the top to the bottom of the protrusion, the first side surface and the second side surface gradually move away from each other. The first side surface and the second side surface are connected by a first arc surface.

[0009] In one embodiment, the top of the protrusion has a first groove.

[0010] In one embodiment, the first side surface and the second side surface are connected to the inner wall surface of the first groove through a second arc surface respectively.

[0011] In one possible implementation manner, a second groove is provided on the first surface, and the anti-wrinkle structure includes a base, the base is connected to the protrusion, and the base is embedded in the second groove.

[0012] In one possible implementation manner, the first surface has an air groove, and the air groove is connected to the outside through an air hole, so that the transfer film can be adsorbed on the first mold core by vacuuming.

[0013] In one possible implementation manner, the second groove is communicated with the air groove, an air hole is provided at the bottom of the second groove, and the anti-wrinkle structure has a through hole, and the through hole is opposite to the air hole.

[0014] In one embodiment, the second surface has a first dimension and a second dimension in a first direction on the side where the transfer film is input, the first direction and the conveying direction of the transfer film satisfy a parallel condition, the first dimension is the dimension of the second surface between the pressing frame and the mold cavity, the second dimension is the dimension of the second surface between the air groove and the mold cavity, the first dimension is 23-25mm, and the second dimension is 3-5mm.

[0015] In one possible implementation manner, the pressing frame has a thinning portion on a side where the transfer film is input, and a gap is formed between the thinning portion and the first surface.

[0016] In one possible implementation manner, the difference between the thinned portion and a third surface of the pressing frame is at least 2.5 mm, and the third surface is a surface of the pressing frame that is connected to the first surface.

[0017] In one embodiment, the second mold core comprises:

[0018] A main body, capable of approaching or moving away from the first mold core along a second direction to close or open the mold with the first mold core;

[0019] A plurality of sliders, which are arranged around the main body and can move with the main body in the second direction to approach or move away from the axis of the main body so as to close or open the mold with the first mold core, and the first surface is perpendicular to the second direction;

[0020] The main body is away from the first mold core, the sliders are away from each other, and the second mold core is molded with the first mold core;

[0021] The main body is close to the first mold core, the sliders are close to each other, and the second mold core is molded with the first mold core.

[0022] In the in-mold transfer mold disclosed in the present invention, a first sealing structure and an anti-wrinkle structure are provided on the first surface of the first mold core opposite to the second mold core. The anti-wrinkle structure is located in the area surrounded by the first sealing structure. The anti-wrinkle structure includes a protruding portion protruding from the first surface. The pressure frame opposite to the first sealing structure fixes the transfer film to the first mold core. When the transfer film is adsorbed on the first mold core by vacuuming, the anti-wrinkle structure can increase the tension of the transfer film, effectively improve the wrinkle problem, and improve the product yield. The protruding portion has a first side surface and a second side surface opposite to each other. From the top to the bottom of the protruding portion, the first side surface and the second side surface gradually move away from each other, and the first side surface and the second side surface are connected by a first curved surface. The top of the protruding portion is a curved surface, which can reduce damage to the transfer film and prevent the protruding portion from damaging the transfer film when the transfer film is adsorbed by vacuuming.

[0023] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0025] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0026] Figure 1 A schematic structural diagram of an in-mold transfer mold according to an embodiment of the present disclosure is shown;

[0027] Figure 2 Shows Figure 1 AA cross-sectional structural diagram;

[0028] Figure 3 Shows Figure 2 Schematic diagram of the enlarged structure of part C;

[0029] Figure 4 Shows Figure 1 BB cross-sectional structure diagram;

[0030] Figure 5 The schematic diagram shows the exploded structure of the in-mold transfer mold of the embodiment of the present disclosure. Figure 1 ;

[0031] Figure 6 The schematic diagram shows the exploded structure of the in-mold transfer mold of the embodiment of the present disclosure. Figure 2 ;

[0032] Figure 7A schematic diagram of the cross-sectional structure of the first mold core of the in-mold transfer mold of the embodiment of the present disclosure is shown.

[0033] Explanation of numbers in the figure: 1-first mold core, 11-first surface, 12-first sealing structure, 2-second mold core, 21-second surface, 22-main body, 23-slider, 231-linkage hole, 232-slider seat, 233-slider insert, 3-pressing frame, 31-thinning portion, 4-anti-wrinkle structure, 41-protruding portion, 411-first side surface, 412-second side surface, 42-first arc surface, 43-through hole, 44-first groove, 45-base, 5-mold cavity, 6-air hole, 7-air groove, L1-first size, L2-second size, 8-transfer film. DETAILED DESCRIPTION

[0034] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0035] See also Figures 1 to 7 The embodiment of the present disclosure provides an in-mold transfer mold, including a first mold core 1, a second mold core 2, a pressing frame 3 and an anti-wrinkle structure 4. The first mold core 1 has a first surface 11, and the first surface 11 has a first sealing structure 12; the second mold core 2 has a second surface 21 corresponding to the first surface 11, and the second surface 21 is connected to the first surface 11, so that the second mold core 2 and the first mold core 1 are molded together to form a mold cavity 5. The pressing frame 3 is arranged between the first mold core 1 and the second mold core 2, and the pressing frame 3 is used to fix the transfer film 8 to the first surface 11 of the first mold core 1, and the pressing frame 3 is opposite to the first sealing structure 12. The anti-wrinkle structure 4 is arranged on the first mold core 1. The anti-wrinkle structure 4 is closer to the mold cavity 5 than the first sealing structure 12. The anti-wrinkle structure 4 includes a protrusion 41 protruding from the first surface 11. The protrusion 41 has a first side surface 411 and a second side surface 412 relative to each other. From the top to the bottom of the protrusion 41, the first side surface 411 and the second side surface 412 gradually move away from each other. The first side surface 411 and the second side surface 412 are connected by a first arc surface 42.

[0036] In the in-mold transfer mold disclosed in the present invention, a first sealing structure 12 and an anti-wrinkle structure 4 are provided on the first surface 11 opposite to the first mold core 1 and the second mold core 2. The anti-wrinkle structure 4 is located in the area surrounded by the first sealing structure 12. The anti-wrinkle structure 4 includes a protrusion 41 protruding from the first surface 11. The pressing frame 3 opposite to the first sealing structure 12 fixes the transfer film 8 to the first mold core 1. When the transfer film 8 is adsorbed on the first mold core 1 by vacuuming, the anti-wrinkle structure 4 can increase the tension of the transfer film 8, effectively improve the wrinkle problem, and improve the product yield. The protrusion 41 has a first side surface 411 and a second side surface 412 opposite to each other. From the top to the bottom of the protrusion 41, the first side surface 411 and the second side surface 412 gradually move away from each other, and the first side surface 411 and the second side surface 412 are connected by a first arc surface 42. The top of the protrusion 41 is an arc surface, which avoids the formation of a ridge at the intersection of the first side surface 411 and the second side surface 412, thereby reducing damage to the transfer film 8 and preventing the protrusion 41 from damaging the transfer film 8 when the transfer film 8 is vacuum-absorbed.

[0037] The in-mold transfer mold includes a fixed mold and a movable mold. The movable mold moves relative to the fixed mold to approach or move away from the fixed mold, thereby achieving mold closing or mold opening. One of the fixed mold and the movable mold includes a first mold core 1, and the other includes a second mold core 2. In the mold closing state, a mold cavity 5 is formed between the first mold core 1 and the second mold core 2, and the injection material is injected into the mold cavity 5 to obtain a product of a corresponding shape.

[0038] One of the fixed mold and the movable mold is provided with a guide column, and the other is provided with a guide hole corresponding to the guide column. The guide column and the guide hole cooperate to guide the movement of the movable mold relative to the fixed mold to achieve mold opening or mold closing. The number of guide columns and the number of corresponding guide holes are not specifically limited. In the exemplary embodiment, the number of guide columns and the number of corresponding guide holes are 4 respectively.

[0039] The first mold core 1 is provided with air holes 6 connecting the mold cavity 5 and the outside of the mold, and the gas between the transfer film 8 and the first mold core 1 is extracted through the air holes 6 to form a vacuum, so that the transfer film 8 is adsorbed on the surface of the first mold core 1. The number of air holes 6 and the specific positions of the air holes 6 are not limited.

[0040] In one embodiment, the radius of the first curved surface 42 connecting the first side surface 411 and the second side surface 412 is not less than 1.5 mm.

[0041] In one embodiment, see Figure 7 The top of the protrusion 41 has a first groove 44. The first groove 44 is provided to guide the gas between the transfer film 8 and the first mold core 1 when vacuum is drawn to make the transfer film 8 attached to the first mold core 1, so as to facilitate the gas discharge.

[0042] In one embodiment, see Figure 7 The first side surface 411 and the second side surface 412 are connected to the inner wall surface of the first groove 44 through the second arc surface. When vacuuming, due to the guidance of the first groove 44 to the other parts, the transfer film 8 will be partially embedded in the first groove 44, the first side surface 411 is connected to the inner wall surface of the first groove 44 through the second arc surface, and the second side surface 412 is connected to the inner wall surface of the first groove 44 through the second arc surface, so as to avoid excessive pressure on the transfer film 8 at the connection part, thereby preventing the transfer film 8 from being broken. The radius of the second arc surface is not less than 1.5 mm.

[0043] In one embodiment, see Figure 7 , the angle between the first side surface 411 and the second side surface 412 is 30°-150°. In a specific implementation, the angle between the first side surface 411 and the second side surface 412 may range from 45° to 120°. For example, the angle between the first side surface 411 and the second side surface 412 may be 60°, 80°, 100°, 110°, etc.

[0044] In one embodiment, see Figure 7 The first side surface 411 and the second side surface 412 are connected to the first surface 11 through a third arc surface, respectively. The first side surface 411 and the second side surface 412 are connected to the first surface 11 through a third arc surface, respectively, which is conducive to the discharge of gas and allows the transfer film 8 to be better adsorbed on the first mold core 1.

[0045] In one embodiment, see Figure 7 The first surface 11 has a second groove, and the anti-wrinkle structure 4 includes a base 45, which is connected to the protrusion 41 and embedded in the second groove. The second groove is provided on the first mold core 1, so that the anti-wrinkle structure 4 is embedded in the second groove, which can reduce the milling process and other processes in the mold preparation process and reduce the generation of waste. It is also convenient to replace the anti-wrinkle structure 4.

[0046] In one embodiment, the second groove is provided with an air hole 6 at the bottom, and the anti-wrinkle structure 4 has a through hole 43, which is opposite to the air hole 6. The second groove is provided with an air hole 6 at the bottom, so that the gas between the transfer film 8 and the first mold core 1 can be discharged through the air hole 6 at the bottom of the second groove. The anti-wrinkle structure 4 is arranged in the second groove, and the anti-wrinkle structure 4 can be connected with the air hole 6 at the bottom of the second groove through the through hole 43, so that the gas reaches the air hole 6 at the bottom of the second groove through the through hole 43 on the anti-wrinkle structure 4 and is discharged. The second groove also has the function of the gas groove 7, which guides the gas to be discharged smoothly.

[0047] The second groove is communicated with the air groove 7 , so that the second groove and the air groove 7 can surround the mold cavity 5 , which is beneficial for gas discharge.

[0048] The through hole 43 of the anti-wrinkle structure 4 is arranged in the first groove 44, so that the gas can be discharged smoothly.

[0049] The anti-wrinkle structure 4 may be arranged only on one side of the mold cavity 5 . When the anti-wrinkle structure 4 is arranged on one side of the mold cavity 5 , it may be arranged along the conveying direction of the transfer film 8 or perpendicular to the conveying direction of the transfer film 8 .

[0050] The anti-wrinkle structure 4 may also be arranged on two opposite sides of the mold cavity 5. Specifically, the anti-wrinkle structure 4 may be arranged along the conveying direction of the transfer film 8, or may be arranged perpendicular to the conveying direction of the transfer film 8.

[0051] Alternatively, the anti-wrinkle structure 4 can also be respectively arranged around the mold cavity 5. Specifically, along the conveying direction of the transfer film 8, an anti-wrinkle structure 4 is respectively arranged on both sides of the mold cavity 5, and at the same time, along the conveying direction perpendicular to the transfer film 8, an anti-wrinkle structure 4 is also respectively arranged on both sides of the mold cavity 5.

[0052] In one embodiment, see Figure 3 , the second surface 21 has a first dimension L1 and a second dimension L2 in the first direction on the side where the transfer film 8 is input, the first direction and the conveying direction of the transfer film 8 meet the parallel condition, the first dimension L1 is the dimension of the second surface 21 between the press frame 3 and the mold cavity 5, the second dimension L2 is the dimension of the second surface 21 between the air groove 7 and the mold cavity 5, the first dimension L1 is 23-25mm, and the second dimension L2 is 3-5mm. The first dimension L1 is 23-25mm, which can ensure that the second mold core 2 has sufficient strength to contact with the first mold core 1 for mold closing, and the second dimension L2 is 3-5mm. While ensuring the sealing between the second mold core 2 and the first mold core 1, the size is reduced, so that the length of the transfer film 8 consumed in a single transfer is reduced, the utilization rate of the transfer film 8 is improved, and the production capacity of the transfer film 8 roll of the same length is increased.

[0053] The second surface 21 of the second mold core 2 has a fourth groove for accommodating the pressing frame 3 , and the first dimension L1 may be the dimension of the second surface 21 between the fourth groove and the mold cavity 5 .

[0054] In one embodiment, see Figure 3 The press frame 3 has a thinning portion 31 on the side where the transfer film 8 is input, and a gap is formed between the thinning portion 31 and the first surface 11. After the press frame 3 on the side where the transfer film 8 is input squeezes the transfer film 8, it will be consumed in this transfer. The embodiment of the disclosure provides a thinning portion 31 on the press frame 3 on the side where the transfer film 8 is input, thereby reducing the contact between the press frame 3 on the input side and the transfer film 8, and allowing the press frame 3 to retain sufficient strength, thereby reducing the consumption of the transfer film 8 in a single transfer, improving the utilization rate of the transfer film 8, and increasing the production capacity of the transfer film 8 roll of the same length.

[0055] In one embodiment, the difference between the thinning portion 31 and the third surface of the pressing frame 3 is at least 2.5 mm, and the third surface is the surface of the pressing frame 3 that is connected to the first surface 11. The difference between the thinning portion 31 and the third surface of the pressing frame 3 is at least 2.5 mm, which can ensure that the thinning portion 31 will not squeeze the transfer film 8 during the mold closing process, thereby reducing the consumption of the transfer film 8.

[0056] In one embodiment, see Figure 4 and Figure 6 The second mold core 2 includes a main body 22 and a plurality of sliders 23. The main body 22 can approach or move away from the first mold core 1 along the second direction to close or open the mold with the first mold core 1; the plurality of sliders 23 are arranged around the main body 22 and can approach or move away from the axis of the main body 22 as the main body 22 moves in the second direction to close or open the mold with the first mold core 1, and the first surface is perpendicular to the second direction; the main body 22 is away from the first mold core 1, the sliders 23 are away from each other, and the second mold core 2 is opened with the first mold core 1; the main body 22 is close to the first mold core 1, the sliders 23 are close to each other, and the second mold core 2 is closed with the first mold core 1. When the main body 22 is away from the first mold core 1, the plurality of sliders 23 are away from the axis of the main body 22 to realize the mold opening and reduce the friction between the second mold core 2 and the product. When the main body 22 is close to the first mold core 1, the plurality of sliders 23 are close to the main body 22 to realize the mold closing. The second direction meets the parallel condition with the axis of the main body 22. When the angle between the two is less than the parallel threshold, the second direction meets the parallel condition with the axis of the main body 22. The parallel threshold may be, for example, 0.5°, 1°, 3°, 5°, etc.

[0057] The slider 23 is linked with the main body 22, which can be realized by a linkage rod. At least two linkage holes 231 are provided on each slider 23, and the axis of the linkage hole 231 is inclined. The angle between the axis of the linkage hole 231 and the axis of the main body 22 is an acute angle, and along the direction in which the main body 22 is away from the first mold core 1, the axis of the linkage hole 231 gradually approaches the axis of the main body 22. A corresponding linkage rod is provided in the linkage hole 231, and the linkage rod can move with the main body 22. Since the linkage hole 231 and the corresponding linkage rod are inclined, when the main body 22 approaches the first mold core 1, the linkage rod drives the slider 23 close to the axis of the main body 22, and when the main body 22 is away from the first mold core 1, the linkage rod drives the slider 23 away from the axis of the main body 22.

[0058] The second surface 21 may be located on a slider 23 , and the slider 23 is used for sealing between the second mold core 2 and the first mold core 1 .

[0059] The slider 23 may include a slider 23 seat 232 and a slider 23 insert 233, wherein the slider 23 insert 233 is connected to the slider 23 seat 232. The second surface 21 is located on the slider 23 insert 233.

[0060] Taking the transfer film 8 with a capacity of 400m per roll as an example, when preparing a conventional 14 / 15-inch notebook computer shell, the currently defined standard preparation is: 14 inches = 860 pcs / roll, 15 inches = 842 pcs / roll.

[0061] The use of the in-mold transfer mold of the disclosed embodiment can reduce or even avoid the occurrence of wrinkles on the product surface during the molding production process. In addition, each roll of transfer film 8 can produce 1014 pieces of 14-inch laptop computer shells, and the utilization rate is increased by 17.9%. Each roll of transfer film 8 can produce 923 pieces of 15-inch laptop computer shells, and the utilization rate is increased by 9.6%.

[0062] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of this disclosure can be achieved, and this document is not limited here.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0064] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An in-mold transfer mold, characterized in that: include: A first mold core having a first surface, wherein the first surface has a first sealing structure; A second mold core has a second surface corresponding to the first surface, the second surface is connected to the first surface, so that the second mold core and the first mold core are molded together to form a mold cavity; A pressing frame is disposed between the first mold core and the second mold core, the pressing frame is used to fix the transfer film to the first surface of the first mold core, and the pressing frame is opposite to the first sealing structure; An anti-wrinkle structure is arranged on the first mold core. The anti-wrinkle structure is closer to the mold cavity than the first sealing structure. The anti-wrinkle structure includes a protrusion protruding from the first surface. The protrusion has a first side surface and a second side surface opposite to each other. From the top to the bottom of the protrusion, the first side surface and the second side surface gradually move away from each other. The first side surface and the second side surface are connected by a first arc surface.

2. The in-mold transfer mold according to claim 1, characterized in that: The top of the protrusion has a first groove.

3. The in-mold transfer mold according to claim 2, characterized in that: The first side surface and the second side surface are connected to the inner wall surface of the first groove through second arc surfaces respectively.

4. The in-mold transfer mold according to claim 2, characterized in that: The first surface has a second groove, and the anti-wrinkle structure includes a base, the base is connected to the protrusion, and the base is embedded in the second groove.

5. The in-mold transfer mold according to claim 4, characterized in that: The first surface is provided with an air groove, and the air groove is connected to the outside through an air hole, so that the transfer film can be adsorbed on the first mold core by vacuuming.

6. The in-mold transfer mold according to claim 5, characterized in that: The second groove is communicated with the air groove, an air hole is provided at the bottom of the second groove, and the anti-wrinkle structure has a through hole, which is opposite to the air hole.

7. The in-mold transfer mold according to claim 5, characterized in that: The second surface has a first size and a second size in a first direction on the side where the transfer film is input, and the first direction satisfies a parallel condition with the conveying direction of the transfer film. The first size is the size of the second surface between the pressing frame and the mold cavity, and the second size is the size of the second surface between the air groove and the mold cavity. The first size is 23-25mm, and the second size is 3-5mm.

8. The in-mold transfer mold according to claim 1, characterized in that: The pressing frame has a thinning portion on a side where the transfer film is input, and a gap is formed between the thinning portion and the first surface.

9. The in-mold transfer mold according to claim 8, characterized in that: The difference between the thinned portion and a third surface of the pressing frame is at least 2.5 mm, and the third surface is a surface of the pressing frame that is connected to the first surface.

10. The in-mold transfer mold according to claim 1, characterized in that: The second mold core comprises: A main body, capable of approaching or moving away from the first mold core along a second direction to close or open the mold with the first mold core; A plurality of sliders, which are arranged around the main body and can move with the main body in the second direction to approach or move away from the axis of the main body so as to close or open the mold with the first mold core, and the first surface is perpendicular to the second direction; The main body is away from the first mold core, the sliders are away from each other, and the second mold core is molded with the first mold core; The main body is close to the first mold core, the sliders are close to each other, and the second mold core is molded with the first mold core.

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