Injection mold for transparent decorative sheet

Abstract

The utility model discloses a kind of injection mould of transparent decorative sheet, it is related to injection mould technical field, including upper die and lower die, the upper die has upper die kernel, the lower die has lower die kernel, the upper die kernel and lower die kernel mutually butt joint to form the cavity for forming transparent decorative sheet;First protruding block is protruded on the parting surface of the upper die kernel, second protruding block is protruded on the parting surface of the lower die kernel, when moulding injection, first protruding block and second protruding block interval correspond, to form waste block between first protruding block and second protruding block, and first protruding block and second protruding block cooperate and block the hole to be formed on transparent decorative sheet;The utility model is through, form waste block corresponding with the hole to be formed on transparent decorative sheet when injection molding, subsequent CNC processing removes the waste block, and hole position can be formed, both avoid the problem of fusion mark caused by traditional core directly forming hole position, guarantee the light transmittance and appearance quality of transparent decorative sheet.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold for a transparent decorative sheet. Background Technology

[0002] Transparent decorative sheets are widely used in consumer electronics and home decoration due to their good light transmission and clean appearance. These products typically require mounting holes or clearance holes on their surface to meet assembly needs, and the machining precision of these holes and the surrounding surface quality directly affect the product's usability and aesthetics.

[0003] Currently, in the injection molding process of transparent decorative sheets, if a hole structure needs to be formed on the product, the traditional process often uses a core set inside the mold to directly form the hole. However, because transparent materials (such as PMMA, PC, etc.) are extremely sensitive to weld lines, the setting of the core can easily cause the molten material to form a converging weld line on the side of the hole. This weld line will reduce the light transmittance consistency of the material and even produce defects that are visible to the naked eye, seriously affecting the appearance quality of the transparent decorative sheet.

[0004] Therefore, it is necessary to propose a new technical solution to address the above problems. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] An injection mold for a transparent decorative sheet includes an upper mold and a lower mold. The upper mold has an upper mold core, and the lower mold has a lower mold core. The upper mold core and the lower mold core are joined together to form a mold cavity for molding the transparent decorative sheet. The upper mold core has a first protrusion on its parting surface, and the lower mold core has a second protrusion on its parting surface. During injection molding, the first protrusion and the second protrusion are spaced and correspond to each other to form a waste block between the first protrusion and the second protrusion. The first protrusion and the second protrusion cooperate to seal the hole to be formed on the transparent decorative sheet.

[0007] As a further aspect of this utility model: the cross-sectional shape of the first protrusion is the same as the cross-sectional shape of the second protrusion.

[0008] As a further embodiment of this utility model: the upper mold is also provided with an injection runner, the injection runner includes a main runner and at least two branch runners connected to the main runner, and each branch runner corresponds to a mold cavity.

[0009] As a further embodiment of this utility model: the number of mold cavities is at least two, and each mold cavity is arranged in an array along the mating surface of the upper mold core and the lower mold core; For each mold cavity, the upper mold core is provided with at least two first protrusions, and the lower mold core is provided with a second protrusion that corresponds one-to-one with the first protrusions.

[0010] As a further embodiment of this utility model: among the at least two first protrusions corresponding to each mold cavity, one of the first protrusions is located at the center position of the parting surface of the mold core on the mold cavity, and the first protrusion located at the center position has an injection hole along its axial direction. The injection hole penetrates the upper mold core and is connected to the corresponding runner. Its outlet end is located on the end face of the first protrusion facing the corresponding second protrusion. During mold closing and injection molding, the molten material enters the gap between the first protrusion and the corresponding second protrusion through the injection hole, and the waste block formed has an integrally formed sprue that connects to the mold cavity.

[0011] As a further embodiment of this utility model: the lower mold is also connected to an ejector mechanism, the ejector mechanism includes an ejector plate and an ejector pin connected thereto, and the end of the ejector pin away from the ejector plate is mated and cooperated with the mold cavity.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention utilizes first and second protrusions spaced at intervals on the parting surfaces of the upper and lower mold cores to form a waste block during injection molding, corresponding to the holes to be formed in the transparent decorative sheet. This waste block is then removed via CNC machining to form the holes, avoiding weld lines caused by directly forming holes with traditional cores and ensuring the light transmittance and appearance quality of the transparent decorative sheet. Furthermore, by placing the sprue on the waste block, it is removed along with the waste block, leaving no trace on the product body and further improving the overall appearance. In addition, the multi-cavity array distribution and the corresponding first and second protrusions improve production efficiency and meet the molding requirements of products with multiple holes.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the lower mold and the lower mold core in this utility model; Figure 3 yes Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the upper mold core in this utility model; Figure 5 This is a schematic diagram of a transparent decorative sheet with waste material blocks and a cut-off waste material block.

[0016] The reference numerals and names in the figure are as follows: 1. Upper mold; 2. Lower mold; 3. Upper mold core; 4. Lower mold core; 5. First protrusion; 6. Second protrusion; 7. Scrap block; 8. Main runner; 9. Sub-runner; 10. Injection hole; 11. Ejection mechanism. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-5 In this embodiment of the present invention, an injection mold for a transparent decorative sheet includes an upper mold 1 and a lower mold 2. The upper mold 1 has an upper mold core 3, and the lower mold 2 has a lower mold core 4. The upper mold core 3 and the lower mold core 4 are connected to each other to form a mold cavity for molding the transparent decorative sheet. The transparent decorative sheet is the product injection molded by the injection mold, and the outer contour of the transparent decorative sheet is adapted to the shape of the mold cavity.

[0019] The upper mold core 3 has several first protrusions 5 protruding on its downward-facing parting surface, and the lower mold core 4 has several second protrusions 6 protruding on its upward-facing parting surface. The positions of the first protrusions 5 and the second protrusions 6 correspond one-to-one. When the mold is in the closed state for injection molding, the first protrusions 5 and the second protrusions 6 are spaced apart and positioned opposite each other. The gap between them is filled by molten material during the injection molding process, and the resulting waste block 7 is the solid structure of the hole to be formed on the transparent decorative sheet. Due to the cooperation and sealing of the first protrusions 5 and the second protrusions 6, this position does not form a through hole during the injection molding stage. Instead, the molten material in the gap is directly formed into waste block 7. After removing the waste block 7 by CNC machining, the required hole can be formed on the transparent decorative sheet. Meanwhile, because the hole is sealed by the cooperation of the first protrusion 5 and the second protrusion 6, the molten material at this position during injection molding only fills the gap between the first protrusion 5 and the second protrusion 6 to form a waste block 7. This waste block 7 is connected to the transparent decorative sheet body but is independent of the main molding area of ​​the body. When the molten material flows in the mold cavity, it does not need to be diverted around the core and then merged. Instead, it naturally fills the mold cavity during the overall flow process. Therefore, weld lines will not be formed around the hole of the transparent decorative sheet body. This effectively avoids the weld line problem caused by the diversion and merging of material when the hole is directly molded by the traditional core, ensuring the light transmission consistency and appearance quality of the transparent decorative sheet.

[0020] The cross-sectional shape of the first protrusion 5 is the same as that of the second protrusion 6. The cross-sectional dimensions of the two can be set according to the size of the hole to be formed on the transparent decorative sheet to ensure that the position and size of the waste block 7 are compatible with the position and size of the hole to be formed, so that the required hole can be formed after the waste block 7 is removed by CNC machining.

[0021] The upper mold 1 is also provided with injection runners, which include a main runner 8 and branch runners 9. One end of the main runner 8 is connected to the nozzle of the injection molding machine, and the other end is connected to the branch runners 9. The number of branch runners 9 matches the number of mold cavities, with at least two. Each branch runner 9 corresponds to one mold cavity, so as to achieve simultaneous material supply to multiple mold cavities.

[0022] The mold cavity has at least two cavities, and each cavity is arranged in an array along the mating surface of the upper mold core 3 and the lower mold core 4, such as a rectangular array or a circular array, to improve injection molding production efficiency. For each cavity, the upper mold core 3 is provided with at least two first protrusions 5, and the lower mold core 4 is provided with the same number of second protrusions 6 as the first protrusions 5 and in a one-to-one correspondence. The arrangement of multiple protrusions can meet the processing requirements of multiple holes to be formed on the transparent decorative sheet. Each hole to be formed corresponds to a waste block 7 formed by a set of first protrusions 5 and second protrusions 6.

[0023] Of the at least two first protrusions 5 corresponding to each mold cavity, one first protrusion 5 is located at the center of the parting surface of the upper mold core 3 where the mold cavity is located. This centrally located first protrusion 5 has an injection hole 10 along its axial direction. One end of the injection hole 10 penetrates the upper mold core 3 and communicates with the corresponding runner 9, while the other end serves as the outlet end on the end face of the first protrusion 5 facing the corresponding second protrusion 6. When the mold is closed for injection molding, the molten material flows from the main flow channel 8 of the injection runner into the runner 9, and then enters the gap between the centrally located first protrusion 5 and the corresponding second protrusion 6 through the injection hole 10. Simultaneously, while forming the scrap block 7 at this location, the molten material communicates with the mold cavity through this gap, thereby forming a sprue on the scrap block 7 that connects to the mold cavity, thus enabling material feeding into the mold cavity. Since the sprue is located on the scrap block 7, rather than directly acting on the transparent decorative sheet body, after injection molding, the sprue is removed by CNC machining along with the scrap block 7, leaving no sprue marks on the surface of the transparent decorative sheet, further ensuring the integrity and neatness of the product's appearance.

[0024] The lower mold 2 is also connected to an ejector mechanism 11, which includes an ejector plate and ejector pins. One end of the ejector pin is fixedly connected to the ejector plate, and the other end is a free end that mates with the mold cavity. After injection molding is completed, during the mold opening process, the ejector plate drives the ejector pin to move upward, and the free end of the ejector pin extends into the mold cavity, ejecting the molded transparent decorative piece and the waste blocks 7 connected to it from the mold cavity for easy removal of the product.

[0025] In summary, this invention, by setting corresponding first protrusions 5 and second protrusions 6 at intervals on the parting surfaces of the upper mold core 3 and the lower mold core 4, forms a waste block 7 corresponding to the holes to be formed on the transparent decorative sheet during injection molding. The hole position can then be formed by removing the waste block 7 through CNC machining. This avoids the weld line problem caused by directly forming the hole position with the traditional core, ensuring the light transmittance and appearance quality of the transparent decorative sheet. At the same time, the sprue is set on the waste block 7, so that it is removed along with the waste block 7 without leaving any trace on the product body, further improving the appearance integrity. In addition, the multi-cavity array distribution and the corresponding first protrusions 5 and second protrusions 6 can improve production efficiency and meet the molding requirements of products with multiple holes.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. An injection mold for a transparent decorative sheet, characterized in that, It includes an upper mold and a lower mold, the upper mold having an upper mold core and the lower mold having a lower mold core, the upper mold core and the lower mold core being joined together to form a mold cavity for molding transparent decorative sheets; The upper mold core has a first protrusion on its parting surface, and the lower mold core has a second protrusion on its parting surface. During injection molding, the first protrusion and the second protrusion are spaced and correspond to each other to form a waste block between the first protrusion and the second protrusion. The first protrusion and the second protrusion cooperate to seal the hole to be formed on the transparent decorative sheet.

2. The injection mold for a transparent decorative sheet according to claim 1, characterized in that, The cross-sectional shape of the first bump is the same as that of the second bump.

3. The injection mold for a transparent decorative sheet according to claim 1, characterized in that, The upper mold is also provided with an injection runner, which includes a main runner and at least two branch runners connected to the main runner, with each branch runner corresponding to a mold cavity.

4. The injection mold for a transparent decorative sheet according to claim 3, characterized in that, The number of mold cavities is at least two, and each mold cavity is arranged in an array along the mating surface of the upper mold core and the lower mold core; For each mold cavity, the upper mold core is provided with at least two first protrusions, and the lower mold core is provided with a second protrusion that corresponds one-to-one with the first protrusions.

5. The injection mold for a transparent decorative sheet according to claim 4, characterized in that, Of the at least two first protrusions corresponding to each mold cavity, one of the first protrusions is located at the center of the parting surface of the mold core in the mold cavity, and the first protrusion located at the center has an injection hole along its axial direction. The injection hole penetrates the upper mold core and is connected to the corresponding runner. Its outlet end is located on the end face of the first protrusion facing the corresponding second protrusion. During mold closing and injection molding, the molten material enters the gap between the first protrusion and the corresponding second protrusion through the injection hole, and the waste block formed has an integrally formed sprue that connects to the mold cavity.

6. The injection mold for a transparent decorative sheet according to claim 1, characterized in that, The lower mold is also connected to an ejection mechanism, which includes an ejector plate and an ejector pin connected thereto. The end of the ejector pin away from the ejector plate is engaged with the mold cavity.

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