CN212331646U - Injection mold structure with double IMR surfaces - Google Patents
Injection mold structure with double IMR surfaces Download PDFInfo
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- CN212331646U CN212331646U CN202020746187.0U CN202020746187U CN212331646U CN 212331646 U CN212331646 U CN 212331646U CN 202020746187 U CN202020746187 U CN 202020746187U CN 212331646 U CN212331646 U CN 212331646U
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Abstract
The utility model discloses a double-sided IMR injection mold structure, which is divided into a front mold part and a rear mold part from a parting surface, wherein the front mold part and the rear mold part are respectively provided with a group of diaphragm pressing frames; in the area where the rear mold membrane is conveyed in the vertical direction, the front mold membrane pressing frame is lower than the mold parting surface or the mold parting surface is parallel and level and protrudes towards the front mold side, a step is formed with the mold parting surface and is in smooth transition, and two front mold membranes are respectively pressed below the area; outside the area where the rear die membrane is conveyed in the vertical direction, the front die membrane pressing frame is provided with a left protruding part and a right protruding part which are higher than the parting surface of the die and protrude towards the rear die side, and the rear die plate is provided with a clearance groove for accommodating the two protruding parts; the rear mold film pressing frame is similar. The requirement that the front side and the back side of a product need to be subjected to IMR in-film transfer printing is met, and the difficulty that the existing single-side IMR injection mold cannot be suitable for occasions where the front mold side and the back mold side of the mold need to press the membrane simultaneously is overcome.
Description
Technical Field
The utility model relates to an injection mold of IMR mould internal transfer printing especially relates to a two-sided IMR's injection mold structure.
Background
IMR, i.e., in-mold transfer, is one of in-mold decoration techniques, in which ink attached to a film is transferred onto an appearance surface of a product by injection molding, and the film is uncovered by a mold opening process. The IMR product transfer printing pattern is vivid, high in production efficiency and good in automation degree, and can be widely applied to decoration of small and medium-sized plastic products, such as mobile phone keys, mobile phone shells, various decorations, decoration panels and the like.
Conventionally, an IMR mold is generally referred to as an in-mold transfer mold for one surface.
The structure of a common single-sided IMR injection mold is shown in figures 1 and 2, a product cavity is positioned on a plane shown by a parting surface, and the mold is divided into a front mold and a rear mold from the parting surface. The film printed with the decorative pattern is transferred from the upper direction and the lower direction of the die and is attached to the parting surface of the rear die.
The front mold part mainly comprises a front mold fixing plate 10, a front mold plate 11, a front mold core 12, a positioning ring 14, a hot nozzle 15 and a front mold ejection system. The front mold ejection system mainly includes a front mold ejector pin base plate 131, a front mold ejector pin panel 132, a front mold ejection cylinder 133, a front mold reset rod 134, and an ejector pin 135.
The rear mould part mainly comprises a rear mould plate 21, a rear mould core 22, square iron 23, a bottom surface plate 24, a rear mould ejection system and an air suction system. The rear mold ejection system includes a rear mold ejector pin panel 251, a rear mold ejector pin base plate 252, a membrane press frame 253, and a rear mold reset rod 254. The suction system mainly includes a suction hole 261 and a packing 262. The bottom of the diaphragm pressing frame 253 and the bottom of the rear mold core 22 are provided with sealing rings 262.
Before the common single-sided IMR injection mold is molded, a front mold part and a rear mold part of the mold are opened from a parting surface, a rear mold ejection system ejects upwards for a certain distance, a membrane pressing frame 253 is separated from the parting surface, and under the conveying action of a membrane conveying device, a membrane 100 moves along the vertical direction of the mold and positions a region printed with a pattern on the membrane to a cavity position. After the position of the membrane is fixed, the membrane pressing frame 253 returns to press the membrane 100 and is attached to the parting surface, the air suction device sucks air between the membrane 100 in the two layers of sealing rings 262 and the surface of the rear mold cavity out through the air suction hole 261, and the vacuum effect enables the membrane 100 to be attached to the surface of the rear mold cavity of the mold evenly and tightly according to the shape of the rear mold cavity side of the mold.
After the diaphragm is properly attached, the mold front and back mold sections are closed and filling begins through hot nozzle 15. And (3) opening the front mold and the rear mold after the injection molding is finished, printing the pattern printed on the diaphragm on the outer surface of the rear mold side of the product, leaving the molded product on the front mold side, and still adsorbing the diaphragm 100 on the surface of the cavity of the rear mold. The molded product is driven by the front mold ejection cylinder 133 to be ejected out by the front mold ejection system. The back mold ejection system then ejects a distance, releases the membrane pressing frame 253 that presses the membrane, and the next pattern area of the membrane 100 is rolled to the cavity position, beginning the next molding cycle.
The disadvantages of the prior art are as follows:
the diaphragm that current single face IMR injection mold used conveys in the position of back mould die joint, and the die joint top of back mould side is equipped with the diaphragm and presses the frame for compress tightly and loosen the diaphragm. The diaphragm presses the parting surface that the frame is higher than the mould and projects to the front mould side, and the corresponding front mould side position need set up the protruding portion that the groove was pressed to the diaphragm and hold to the front mould.
The diaphragm pressure frame of the existing single-side IMR injection mold is higher than the parting surface of the mold, and the characteristic determines that the existing single-side IMR injection mold can only carry out in-mold transfer printing decoration on the appearance surface of one side of a product. Because if the diaphragm pressure frame protruding towards the rear mold is arranged on the front mold side of the mold, the diaphragm pressure frame will interfere with the diaphragm pressure frame protruding towards the front mold arranged on the rear mold side, so that the common single-sided IMR injection mold cannot be applied to occasions where the diaphragm needs to be pressed simultaneously on the front mold side and the rear mold side of the mold, and the requirement of IMR in-mold transfer printing on the front side and the back side of a product cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a two-sided IMR's injection mold structure.
The utility model aims at realizing through the following technical scheme:
the utility model discloses a two-sided IMR's injection mold structure, the concrete implementation mode of its preferred is:
the front die part and the rear die part are divided from a parting surface and are respectively provided with a group of membrane pressing frames 343 and 443;
the front mould part mainly comprises a front mould fixing plate 30, a front mould plate 31, a front mould core 32, front mould square iron 33, a front mould ejection system, a front mould suction system, a positioning ring 36 and a hot nozzle 37;
the front mold ejection system mainly comprises a front mold ejector pin panel 341, a front mold ejector pin base plate 342, a front mold membrane pressure frame 343, a front mold reset rod 344, an ejector rod 345 and a front mold ejection cylinder 346;
the front mold suction system mainly comprises a front mold suction hole 351 and a front mold sealing ring 352, wherein the front mold sealing ring 352 is arranged at the bottom of the front mold membrane pressing frame 343 and the bottom of the front mold core 32;
the rear mould part mainly comprises a rear mould fixing plate 40, a rear mould plate 41, a rear mould core 42, rear mould square iron 43, a rear mould ejection system and a rear mould suction system;
the rear mold ejection system mainly comprises a rear mold ejector pin panel 441, a rear mold ejector pin bottom plate 442, a rear mold membrane pressing frame 443 and a rear mold reset rod 444;
the rear mold suction system mainly comprises a rear mold suction hole 451 and a rear mold sealing ring 452, and the rear mold sealing ring 452 is arranged at the bottom of the rear mold film pressing frame 443 and the bottom of the rear mold core 42.
By the above-mentioned the technical scheme provided by the utility model, the embodiment of the utility model provides a two-sided IMR's injection mold structure has satisfied the demand that the positive and negative two sides of product all need carry out IMR intramembrane rendition, has overcome this difficulty of occasion that current single face IMR injection mold can't be applicable to the front mould side and the back mould side of mould and need push down the diaphragm simultaneously.
Drawings
Fig. 1 and fig. 2 are a schematic structural view and a schematic cross-sectional view of a single-sided IMR injection mold in the prior art, respectively;
fig. 3 is a schematic side view of a front mold of a double-sided IMR injection mold according to an embodiment of the present invention;
fig. 4a and fig. 4b are a schematic cross-sectional view of the front mold side of a double-sided IMR injection mold and an enlarged schematic view of a part a thereof, respectively, according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a rear mold side structure of a double-sided IMR injection mold according to an embodiment of the present invention;
fig. 6a and fig. 6B are respectively a schematic cross-sectional view and an enlarged schematic view of part B of a rear mold side structure diagram of a double-sided IMR injection mold according to an embodiment of the present invention;
fig. 7 is a schematic axial view of a front mold diaphragm pressing frame of a double-sided IMR injection mold according to an embodiment of the present invention;
fig. 8 is an axial schematic view of a rear mold film pressing frame of the double-sided IMR injection mold according to an embodiment of the present invention.
In the figure:
10. the front mold comprises a front mold fixing plate, 11 front mold plates, 12 front mold cores, 131 front mold ejector pin base plates, 132 front mold ejector pin panels, 133 front mold ejector oil cylinders, 134 front mold reset rods, 135 ejector rods, 14 positioning rings and 15 hot nozzles;
21. the die comprises a rear die plate, 22 parts of a rear die core, 23 parts of square iron, 24 parts of a bottom plate, 251 parts of a rear die ejector pin panel, 252 parts of a rear die ejector pin bottom plate, 253 parts of a diaphragm pressing frame, 254 parts of a rear die reset rod, 261 parts of an air suction hole, 262 parts of a sealing ring and 100 parts of a diaphragm;
30. the front mold comprises a front mold fixing plate, 31, a front mold plate, 32, a front mold core, 33, front mold square iron, 341, a front mold ejector pin panel, 342, a front mold ejector pin bottom plate, 343, a front mold sheet pressing frame, 344, a front mold reset rod, 345, an ejector rod, 346, a front mold ejection oil cylinder, 351, a front mold suction hole, 352, a front mold sealing ring, 36, a positioning ring, 37, a hot nozzle, 311, a rear mold sheet pressing frame convex part clearance groove, 3431, a front mold sheet pressing frame convex part and 200, a front mold sheet;
40. the mold comprises a rear mold fixing plate, 41, a rear mold plate, 42, a rear mold core, 43, rear mold square iron, 441, a rear mold ejector pin panel, 442, a rear mold ejector pin base plate, 443, a rear mold membrane pressing frame, 444, a rear mold reset rod, 451, a rear mold suction hole, 452, a rear mold sealing ring, 411, a front mold membrane pressing frame convex part clearance groove, 4431, a rear mold membrane pressing frame convex part and 300, a rear mold membrane.
Detailed Description
Embodiments of the present invention will be described in further detail below. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art.
The utility model discloses a two-sided IMR's injection mold structure, the concrete implementation mode of its preferred is:
the front die part and the rear die part are divided from a parting surface and are respectively provided with a group of membrane pressing frames 343 and 443;
the front mould part mainly comprises a front mould fixing plate 30, a front mould plate 31, a front mould core 32, front mould square iron 33, a front mould ejection system, a front mould suction system, a positioning ring 36 and a hot nozzle 37;
the front mold ejection system mainly comprises a front mold ejector pin panel 341, a front mold ejector pin base plate 342, a front mold membrane pressure frame 343, a front mold reset rod 344, an ejector rod 345 and a front mold ejection cylinder 346;
the front mold suction system mainly comprises a front mold suction hole 351 and a front mold sealing ring 352, wherein the front mold sealing ring 352 is arranged at the bottom of the front mold membrane pressing frame 343 and the bottom of the front mold core 32;
the rear mould part mainly comprises a rear mould fixing plate 40, a rear mould plate 41, a rear mould core 42, rear mould square iron 43, a rear mould ejection system and a rear mould suction system;
the rear mold ejection system mainly comprises a rear mold ejector pin panel 441, a rear mold ejector pin bottom plate 442, a rear mold membrane pressing frame 443 and a rear mold reset rod 444;
the rear mold suction system mainly comprises a rear mold suction hole 451 and a rear mold sealing ring 452, and the rear mold sealing ring 452 is arranged at the bottom of the rear mold film pressing frame 443 and the bottom of the rear mold core 42.
In the area where the rear mold membrane 300 is conveyed in the vertical direction, the front mold membrane pressing frame 343 is lower than the mold parting surface or is flush with the mold parting surface and protrudes towards the front mold side, a step is formed with the mold parting surface and is in smooth transition, and the two front mold membranes 200 are respectively pressed below the area;
outside the area where the rear mold film 300 is transferred in the vertical direction, the front mold film bezel 343 is provided with two front mold film bezel convex portions 3431 on the left and right which are higher than the mold parting surface and convex toward the rear mold side, and the rear mold plate 41 is provided with a clearance groove 411 for accommodating the two convex portions 3431.
In the area where the two front mold membranes 200 are conveyed in the horizontal direction, the rear mold membrane pressing frame 443 is flush with the mold parting surface or the mold parting surface and protrudes towards the rear mold side, a step is formed on the mold parting surface and is in smooth transition with the mold parting surface, and the rear mold membrane 300 is pressed below the area;
outside the area where the two front mold sheets 200 are conveyed in the horizontal direction, the rear mold sheet pressing frame 443 is provided with two rear mold sheet pressing frame convex portions 4431 which are higher than the mold parting surface and protrude toward the front mold side, and the front mold plate 31 is provided with a clearance groove 311 for accommodating the two convex portions 4431.
The utility model discloses a two-sided IMR's injection mold structure has satisfied the product tow sides and all needs to carry out the demand of IMR intramembrane rendition, has overcome this difficulty of occasion that current single face IMR injection mold can't be applicable to the front mould side and the back mould side of mould and need push down the diaphragm simultaneously.
The specific embodiment is as follows:
the double-sided IMR injection mold is divided into a front mold part and a rear mold part from a parting surface.
As shown in fig. 3, fig. 4a and fig. 4b, the front mold part mainly includes a front mold fixing plate 30, a front mold plate 31, a front mold core 32, a front mold square iron 33, a front mold ejecting system, a front mold suction system, a positioning ring 36 and a hot nozzle 37. Front mold two front mold membranes 200 for IMR in-mold transfer are horizontally transferred to the mold cavity in the left-right direction of the mold.
The front mold ejection system mainly includes a front mold ejector pin panel 341, a front mold ejector pin base plate 342, a front mold membrane pressing frame 343, a front mold reset rod 344, an ejector rod 345, and a front mold ejection cylinder 346.
The front mold suction system mainly includes a front mold suction hole 351 and a front mold sealing ring 352. The bottom of the front mold membrane pressing frame 343 and the bottom of the front mold core 32 are both provided with front mold sealing rings 352.
As shown in fig. 5, fig. 6a and fig. 6b, the rear mold part mainly includes a rear mold fixing plate 40, a rear mold plate 41, a rear mold core 42, a rear mold square iron 43, a rear mold ejection system, and a rear mold suction system. The rear mold membrane 300 for the IMR in-mold transfer is vertically transferred to the mold cavity in the up-down direction of the mold.
The rear mold ejection system mainly includes a rear mold ejector pin panel 441, a rear mold ejector pin base plate 442, a rear mold membrane pressing frame 443, and a rear mold reset rod 444.
The rear mold suction system mainly includes a rear mold suction hole 451 and a rear mold seal 452. The bottom of the rear mold film pressing frame 443 and the bottom of the rear mold core 42 are both provided with rear mold sealing rings 452.
As shown in fig. 4a and 4b, the front mold film frame 343 is significantly different from the film frame of the conventional single-sided IMR injection mold in that the front mold film frame 343 is not higher than the mold parting surface and does not protrude toward the back mold side of the mold in the region where the back mold film 300 is transferred in the vertical direction, so that this region does not interfere with the film frame on the back mold side and does not affect the transfer of the film 300 on the back mold side. The front mold diaphragm pressing frame 343 protrudes toward the front mold side, forms a step with the parting surface of the mold and smoothly transits, and the two front mold diaphragms 200 are respectively pressed below the region.
Outside the area where the back mold film 300 is transferred in the vertical direction, the front mold film bezel 343 is provided with two right and left areas which are higher than the mold parting surface and are protruded to the back mold side, and these two areas are used to reinforce the strength of the film bezel, as shown in fig. 3, and the front mold film bezel-convex portion 3431. The rear mold 41 is provided with a clearance groove for accommodating the two raised areas, and the front mold film frame is provided with a raised portion clearance groove 411, as shown in fig. 5. An isometric view of the front mold membrane pressure frame 343 is shown in fig. 7.
As shown in fig. 6a and 6b, the film frame 443 of the rear mold is significantly different from the film frame of the conventional single-sided IMR injection mold in that in the region where two front mold films 200 are transferred in the horizontal direction, the film frame 443 of the rear mold is not higher than the parting surface of the mold and does not protrude toward the front mold side of the mold, so that this region does not interfere with the film frame of the front mold side and does not affect the film transfer of the front mold side. The rear mold diaphragm pressing frame 443 protrudes toward the rear mold side, forms a step with the parting surface of the mold and smoothly transitions, and the rear mold diaphragm 300 is pressed below this region.
Outside the region where the two front mold sheets 200 are transferred in the horizontal direction, the rear mold sheet pressing frame 443 is provided with two upper and lower regions which are higher than the mold parting surface and protrude toward the front mold side, and these two regions serve to reinforce the strength of the sheet pressing frame, as shown in fig. 5, and a rear mold sheet pressing frame convex portion 4431. A relief groove 311 is provided in the front mold plate 31 to accommodate the two raised areas and a relief groove 311 is provided in the raised portion of the rear mold plate pressing frame, as shown in fig. 3. An isometric view of the rear mold film platen 443 is shown in fig. 8.
Before the injection mold of the double-sided IMR is molded, a front mold part and a rear mold part of the mold are opened from the position of a parting surface, a front mold ejection system ejects upwards for a certain distance under the action of a front mold ejection oil cylinder 346, a front mold membrane pressing frame 343 and the parting surface are separated, two front mold membranes 200 are conveyed along the horizontal direction of the mold under the conveying action of a membrane conveying device, and an area printed with patterns on the membranes is positioned to the position of a cavity. After the front mold membrane is fixed, the front mold membrane pressing frame 343 returns to press the front mold membrane 200 and attach to the parting surface, the air suction device sucks air between the membrane 200 in the two layers of front mold sealing rings 352 and the surface of the front mold cavity through the front mold air suction hole 351, and the vacuum effect enables the front mold membrane 200 to be attached to the surface of the front mold cavity of the mold evenly and tightly according to the shape of the front mold cavity side of the mold.
When the mold is opened to adsorb the front mold membrane, the rear mold ejection system ejects upwards for a certain distance, the rear mold membrane pressing frame 443 and the parting surface are separated, and under the conveying action of the membrane conveying device, the rear mold membrane 300 moves along the vertical direction of the mold, and the area printed with the patterns on the membrane is positioned to the position of the cavity. After the position of the rear mold membrane is fixed, the rear mold membrane pressing frame 443 returns to press the rear mold membrane 300 and attach the rear mold membrane to the parting surface, the air suction device sucks air between the membrane 300 in the two layers of rear mold sealing rings 452 and the surface of the rear mold cavity through the rear mold suction holes 451, and the vacuum effect enables the rear mold membrane 300 to be attached to the surface of the rear mold cavity of the mold evenly and tightly according to the shape of the rear mold cavity side of the mold.
After the front and back mold membranes are properly attached, the mold front and back mold portions are closed and the molten plastic begins to be injected through the hot nozzle 37 and the runner. And (3) opening the front mold and the rear mold after injection molding is finished, respectively printing the patterns printed on the front mold and the rear mold on the outer surfaces of the front mold and the rear mold of the product, leaving the molded product on the side of the front mold, and ejecting the product by a front mold ejection system under the driving of a front mold ejection oil cylinder 346. And then ejecting the front and rear mold ejection systems for a certain distance, releasing the diaphragms of the front and rear molds by the diaphragm pressing frames of the front and rear molds, continuously conveying the next pattern area of the diaphragms of the front and rear molds to the cavity position, and starting to perform the next molding cycle.
The utility model discloses a two-sided IMR's injection mold presses the frame through setting up a set of diaphragm respectively in front mould side and back mould side, and its advantage mainly has following several aspects:
(1) the limitation of the existing single-face IMR injection mold is overcome. This injection mold of two-sided IMR has set up a set of diaphragm pressure frame respectively in front mould side and back mould side, and these two sets of pressure frames do not have the part of protrusion die joint in the transfer area of diaphragm, can not interfere each other, can not block the conveying of diaphragm yet, can realize two-sided IMR's injection moulding smoothly.
(2) The patterns on the front and back surfaces of the formed product are vivid, the production efficiency is high, and the automation degree is good.
(3) The membrane uses coiled materials, and continuous and stable production can be realized.
The core utility model is that:
1. and a group of diaphragm pressing frames are respectively arranged on the front die side and the rear die side.
2. The film pressing frame on the front die side is not provided with a part protruding out of the parting surface in the film conveying area, and two convex parts are arranged outside the film conveying area to increase the strength of the film pressing frame.
3. The film pressing frame on the back die side is not provided with a part protruding the parting surface in the film conveying area, and two convex parts are arranged outside the film conveying area to increase the strength of the film pressing frame.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. The utility model provides a two-sided IMR's injection mold structure, is divided into front mould part and back mould part from the die joint, its characterized in that:
the front mould part mainly comprises a front mould fixing plate (30), a front mould plate (31), a front mould core (32), front mould square iron (33), a front mould ejection system, a front mould air suction system, a positioning ring (36) and a hot nozzle (37);
the front mold ejection system mainly comprises a front mold ejector pin panel (341), a front mold ejector pin base plate (342), a front mold membrane pressing frame (343), a front mold reset rod (344), an ejector rod (345) and a front mold ejection oil cylinder (346);
the front mold air suction system mainly comprises a front mold air suction hole (351) and a front mold sealing ring (352), wherein the front mold sealing ring (352) is arranged at the bottom of the front mold membrane pressing frame (343) and the bottom of the front mold core (32);
the rear mould part mainly comprises a rear mould fixing plate (40), a rear mould plate (41), a rear mould core (42), rear mould square iron (43), a rear mould ejection system and a rear mould suction system;
the rear mold ejection system mainly comprises a rear mold ejector pin panel (441), a rear mold ejector pin base plate (442), a rear mold membrane pressing frame (443) and a rear mold reset rod (444);
the rear mold suction system mainly comprises a rear mold suction hole (451) and a rear mold sealing ring (452), and the rear mold sealing ring (452) is arranged at the bottom of the rear mold film pressing frame (443) and the bottom of the rear mold core (42).
2. The double-sided IMR injection mold structure of claim 1, wherein:
in the area where the rear mold membrane (300) is conveyed in the vertical direction, the front mold membrane pressing frame (343) is lower than the mold parting surface or is flush with the mold parting surface and protrudes towards the front mold side, a step is formed on the mold parting surface and is in smooth transition, and two front mold membranes (200) are respectively pressed below the area;
outside the area where the rear mold film (300) is conveyed in the vertical direction, the front mold film pressing frame (343) is provided with a left and right front mold film pressing frame convex part (3431) which is higher than the parting surface of the mold and protrudes to the rear mold side, and a clearance groove (411) for accommodating the two convex parts (3431) is arranged on the rear mold plate (41).
3. The double-sided IMR injection mold structure of claim 2, wherein:
in the area where the two front mold membranes (200) are conveyed in the horizontal direction, the rear mold membrane pressing frame (443) is flush with the parting surface of the mold or the parting surface of the mold and protrudes towards the rear mold side, a step is formed on the parting surface of the mold and is in smooth transition with the parting surface of the mold, and the rear mold membrane (300) is pressed below the area;
outside the area of the horizontal direction conveying of the two front mold film sheets (200), the rear mold film sheet pressing frame (443) is provided with a rear mold film sheet pressing frame convex part (4431) which is higher than the parting surface of the mold at the upper part and the lower part and protrudes towards the front mold side, and a clearance groove (311) for accommodating the two convex parts (4431) is arranged on the front mold plate (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020746187.0U CN212331646U (en) | 2020-05-08 | 2020-05-08 | Injection mold structure with double IMR surfaces |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020746187.0U CN212331646U (en) | 2020-05-08 | 2020-05-08 | Injection mold structure with double IMR surfaces |
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| CN212331646U true CN212331646U (en) | 2021-01-12 |
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| CN202020746187.0U Active CN212331646U (en) | 2020-05-08 | 2020-05-08 | Injection mold structure with double IMR surfaces |
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