Casting body material and preparation method thereof

Abstract

The invention relates to a casting body material and a preparation method thereof, and the preparation method comprises the following steps: a silica gel protective film is subjected to primary punching, the silica gel protective film comprises a silica gel base film, a silica gel layer and an auxiliary material surface film which are stacked in sequence, and a punched silica gel inner frame is arranged on a silica gel mold; the silica gel protective film is punched through a silica gel mold, then the auxiliary material surface film is pulled down, waste, in the silica gel inner frame, of the silica gel layer is taken away and discharged, then the silica gel base film is completely discharged, and a casting body is attached to the remaining reserved area exposed out of the silica gel layer; a casting body is subjected to secondary punching, the casting body comprises a casting base film and a casting layer, the casting base film, the casting layer and the silica gel layer are sequentially stacked, and a casting inner frame for punching is arranged on the casting mold; and punching the casting body by using a casting mold, directly tearing off the silica gel layer to take away the waste material area of the casting layer outside the casting inner frame, and leaving the product area of the casting layer to obtain the casting body material. Compared with the prior art, the waste material area of the casting body is smoothly discharged, the casting body is not easy to break, and the productivity and the yield are improved.

Description

Technical Field

[0001] This invention belongs to the field of die-cutting technology and relates to a cast film material and its preparation method. Background Technology

[0002] Cast films are non-stretched, non-oriented flat-extruded films produced by rapidly cooling melt casting. The materials mainly include polymers, ceramics, or metals. Polymers, due to their excellent mechanical properties, chemical stability, and processability, are among the most commonly used materials for cast films. This type of film boasts high production speed and yield, exhibiting excellent transparency, gloss, and thickness uniformity. There are two main methods for producing cast films: single-layer casting and multi-layer co-extrusion casting. Compared to blown films, cast films offer significant advantages in quality and appearance, making them favored in many applications. Cast films have a wide range of applications, playing a vital role not only in packaging materials but also in electronics, medical, and other fields.

[0003] Furthermore, tape casting is a relatively mature method for obtaining high-quality, ultra-thin ceramic sheets, and it has been widely used in the production of advanced ceramics such as monolithic capacitor ceramic sheets, thick-film and thin-film circuit substrates. This technology involves casting a mixture of ceramic powder, solvent, binder, and plasticizer onto a planar substrate using a scraper. After uniform spreading and solvent evaporation, a ceramic sheet (green sheet) with a certain strength and flexibility is formed. The tape casting process includes the preparation of the initial slurry and the adjustment of subsequent process parameters. The composition of the tape slurry not only determines the specific process parameters of the subsequent tape casting process but also affects the appearance morphology of the green sheet, co-firing compatibility, and the overall performance of the final product.

[0004] The material of the cast film is very brittle, and it is prone to breakage after being die-cut into product shapes and scrap material is removed from the edges. This seriously affects production capacity during the manufacturing process. For example Figures 1 to 3 As shown, the existing process punches the casting layer 22 on the casting base film 21 with a casting die. After continuous punching, the dark shaded area is the product area 221, and the light shaded area is the waste area 222. Because the material of the casting body is too brittle, it often breaks when removing the outline waste in the waste area 222 surrounding the product area 221 of the casting layer 22. Although the process design is simple, it cannot remove the waste smoothly. The machine cannot achieve online waste removal. The operator can only manually remove the outline waste during production, and it is also easy to break, which seriously affects the production capacity.

[0005] Patent CN109401663A discloses a manufacturing process for double-sided adhesive on silicone pads, which includes the following steps: bonding a fluoropolymer release film, double-sided adhesive, and a matte film together; punching out positioning holes and adhesive-free areas; punching out a partial outline of the grooved adhesive and forming a blue release film with a handle on the surface; punching out the complete outline of the grooved adhesive to form a first punched product; taking a silicone protective film and a fluoropolymer release film respectively, and punching out an opening to expose the handle; attaching the silicone protective film and the fluoropolymer release film to the upper and lower surfaces of the first punched product respectively to obtain a grooved double-sided adhesive composite layer; making a dustproof mesh double-sided adhesive composite layer; attaching the grooved double-sided adhesive composite layer to the groove of a silicone pad, and attaching the dustproof mesh double-sided adhesive composite layer to the other bottom surface of the silicone pad to obtain the final silicone pad double-sided adhesive product. However, the final product structure mentioned in the patent is "double-sided adhesive + silicone pad + double-sided adhesive + mesh + double-sided adhesive + handle film." The grooved double-sided adhesive layer is determined by the product structure and needs to be adhered to the groove of a silicone pad. The product manufacturing method involves first making the double-sided adhesive on one side of the silicone pad, then making the double-sided adhesive + mesh + double-sided adhesive on the other side of the silicone pad, and then assembling these two sets of semi-finished products onto the corresponding two sides of the silicone pad. Furthermore, the silicone protective film mentioned in the patent is an auxiliary material used to adhere to the blue release film surface forming the first die-cut product, serving a positioning and support function, and is unrelated to the processing of the cast body. Summary of the Invention

[0006] The purpose of this invention is to overcome at least one defect of the prior art by providing a cast material and its preparation method. This invention smoothly removes waste material from the cast material, making it less prone to breakage and improving production capacity and yield.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] One of the technical solutions of the present invention is to provide a method for preparing a cast film material, the method comprising the following steps:

[0009] S1. Silicone protective film is rinsed off.

[0010] The silicone protective film comprises a silicone base film, a silicone layer, and an auxiliary material film stacked sequentially. The silicone mold is provided with a silicone inner frame for punching, and the edge of the silicone inner frame serves as the silicone cutting line.

[0011] First, use a silicone mold to punch and cut the silicone protective film, then pull down the auxiliary material film to remove the waste material of the silicone layer inside the silicone frame. Then remove all the silicone base film and attach the casting to the remaining area of ​​the exposed silicone layer.

[0012] S2, two strokes of the cast body

[0013] The cast body includes a cast base film and a cast layer, wherein the cast base film, the cast layer and the silicone layer are stacked in sequence, and the silicone layer is tightly bonded to the waste area of ​​the cast body. The casting mold is provided with a casting inner frame for punching, and the edge of the casting inner frame serves as the casting cutter line.

[0014] First, use a casting die to punch the cast body, then directly peel off the silicone layer and take away the waste area of ​​the cast layer outside the inner frame of the casting layer. The remaining product area of ​​the cast layer is used to obtain the cast body material.

[0015] Furthermore, in step S1, a silicone mold is used to punch a silicone protective film from top to bottom, with the silicone base film placed above the silicone mold.

[0016] As a preferred technical solution, silicone is first coated onto a silicone base film and then cured to form a silicone layer, and then an auxiliary material mask is attached to the silicone layer.

[0017] Furthermore, in step S1, the silicone base film is made of oriented polypropylene (OPP) or polyethylene terephthalate (PET), serving as both a substrate and a transparent film to protect the adhesive surface.

[0018] The thickness of the silicone base film is 25-100μm.

[0019] Furthermore, the thickness of the silicone layer in step S1 is 5-20 μm;

[0020] The tack of the silicone layer should be 20-30G. If the tack is too low, the silicone layer will not stick to the surface of the cast material. If the tack is too high, the silicone base film on the silicone layer will not be easy to peel off.

[0021] Furthermore, in step S1, the material of the auxiliary mask is oriented polypropylene or polyethylene terephthalate, which serves as a transparent protective adhesive surface to hold the waste material of the silicone layer inside the silicone frame after the silicone protective film is ejected, so that the waste material adheres to the auxiliary mask and does not fly around. When the auxiliary mask is removed, the waste material can be taken away with it.

[0022] The thickness of the auxiliary mask is 25-100μm.

[0023] Furthermore, in step S2, the casting body is punched from bottom to top using a casting die, and the casting base film is placed above the casting die facing away from it.

[0024] As a preferred technical solution, a flat extruded film without stretching and without orientation is formed by rapidly cooling the melt after casting onto the base film as a casting layer.

[0025] Furthermore, in step S2, the material of the cast base film is oriented polypropylene or polyethylene terephthalate as the substrate;

[0026] The thickness of the cast base film is 25-100μm.

[0027] Furthermore, the thickness of the cast layer in step S2 is 30-40 μm.

[0028] Furthermore, in step S2, when the silicone mold and the casting mold are matched, there is a 0.1-1mm drop between the silicone cutting line and the casting cutting line. Since the silicone protective film and the casting body are attached together, when the silicone protective film is peeled off, the casting body will be taken away. Theoretically, the casting inner frame is located inside the silicone inner frame, that is, the casting cutting line is located inside the silicone cutting line.

[0029] On the one hand, this drop distance is to prevent the first and second strokes from overlapping when they are matched. If the drop of the blade line is too small, when the first and second strokes overlap when they are matched, fuzz will be generated. Even when the inner frame of the cast film appears outside the inner frame of the silicone, after the waste is discharged, there will be a silicone layer on the product area that cannot be removed. Once it is manually removed, there will be a shortage of product material.

[0030] On the other hand, this drop distance allows the cast layer without silicone support at the drop point to be easily carried away when the auxiliary material film is pulled down and the waste material in the silicone inner frame is taken away. If the drop of the cutting line is too large, the cast layer without silicone support may not be completely removed when the waste is discharged, resulting in the cast layer breaking.

[0031] One of the technical solutions of the present invention is to provide a cast body material, which is prepared by the method described above.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The present invention removes the waste area of ​​the cast body by means of the attached silicone protective film, which can realize machine waste removal without human interference, making the process smoother, increasing production capacity and yield.

[0034] (2) The inner frame cutter line of the present invention has a certain drop through two punching. When the silicone protective film removes the waste area of ​​the cast body, the remaining waste area of ​​the cast body without silicone protective film can be easily removed together. It is not easy to break and the product area of ​​the cast body is clearly preserved. Attached Figure Description

[0035] Figure 1 This is a schematic cross-sectional view of the cast body before continuous punching in the prior art of this invention;

[0036] Figure 2 This is a schematic cross-sectional view of the cast body after continuous punching in the prior art of this invention;

[0037] Figure 3 This is a top view of the structure of the cast body after continuous stamping in the prior art of this invention;

[0038] Figure 4 This is a schematic diagram of the structure of the silicone mold in an embodiment of the present invention;

[0039] Figure 5 This is a schematic cross-sectional view of the silicone protective film before punching in an embodiment of the present invention;

[0040] Figure 6 This is a schematic cross-sectional view of the silicone protective film after one punching in an embodiment of the present invention;

[0041] Figure 7 This is a top view of the silicone protective film after punching and unloading in an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the casting mold in an embodiment of the present invention;

[0043] Figure 9 This is a schematic diagram of the structure when the silicone mold and the casting mold are matched in an embodiment of the present invention;

[0044] Figure 10 This is a schematic cross-sectional view of the cast body with a silicone protective film attached before the second punch in an embodiment of the present invention;

[0045] Figure 11 This is a schematic cross-sectional view of the cast body with a silicone protective film attached after two punching in an embodiment of the present invention;

[0046] Figure 12 This is a top view of the cast body after two punching, with a silicone protective film attached, in an embodiment of the present invention.

[0047] Explanation of markings in the diagram:

[0048] 11—Silicone base film, 12—Silicone layer, 121—Retention area, 13—Auxiliary material mask;

[0049] 21—Cast base film, 22—Cast layer, 221—Product area, 222—Waste area;

[0050] 3—Silicone mold, 31—Silicone inner frame, 32—Silicone cutting line;

[0051] 4—Casting mold, 41—Casting inner frame, 42—Casting cutter line. Detailed Implementation

[0052] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0053] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," "third," etc., used to describe a common object only indicate different instances of the same object, and do not imply that the objects described in this way must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] Unless otherwise specified, the equipment used in the following embodiments is conventional equipment in the art; unless otherwise specified, the reagents used are commercially available products or prepared by conventional methods in the art. In the following embodiments, unless otherwise described in detail, conventional experimental methods in the art can be used.

[0056] Example:

[0057] A cast film material and its preparation method, the specific steps of which are as follows:

[0058] S1, such as Figures 4 to 7 As shown, the silicone protective film is punched once.

[0059] The silicone protective film includes a silicone base film 11, a silicone layer 12 and an auxiliary material film 13 stacked in sequence. The silicone mold 3 is provided with a silicone inner frame 31 for punching, and the edge of the silicone inner frame 31 serves as a silicone cutting line 32.

[0060] First, use the silicone mold 3 to punch the silicone protective film from top to bottom. Place the silicone base film 11 above the silicone mold 3. Then pull down the auxiliary material film 13 to remove the waste material of the silicone layer 12 in the silicone inner frame 31. Then remove all the silicone base film 11 and attach the casting to the remaining area 121 (shaded area) of the exposed silicone layer 12.

[0061] First, silicone is applied to the silicone base film 11 and cured to form a silicone layer 12. Then, the auxiliary material film 13 is attached to the silicone layer 12.

[0062] The silicone base film 11 is made of oriented polypropylene (OPP) or polyethylene terephthalate (PET), and in this embodiment, PET is preferred, serving as both a substrate and a transparent film to protect the adhesive surface.

[0063] The thickness of the silicone base film 11 is 25-100μm, with 50μm and 75μm being commonly used. In this embodiment, 50μm is preferred.

[0064] The thickness of the silicone layer 12 is 5-20 μm, and is preferably 10 μm in this embodiment;

[0065] The viscosity of the silicone layer 12 is 20-30G, preferably 25G in this embodiment. If the viscosity is too low, the silicone layer 12 will not stick to the surface of the cast body. If the viscosity is too high, the silicone base film 11 on the silicone layer 12 will not be easy to peel off.

[0066] The auxiliary material 13 is made of OPP or PET, and in this embodiment, PET is preferred. It serves as a transparent protective adhesive surface to carry the waste material of the silicone layer 12 inside the silicone inner frame 31 after the silicone protective film is punched, so that the waste material adheres to the auxiliary material 13 and does not fly around. When the auxiliary material 13 is removed, the waste material can be taken away with it.

[0067] The thickness of the auxiliary material mask 13 is 25-100μm, with 50μm and 75μm being commonly used. In this embodiment, 50μm is preferred.

[0068] S2, such as Figure 8 , Figures 10 to 12 As shown, the tapered body is two-stroke.

[0069] The cast body includes a cast base film 21 and a cast layer 22. The cast base film 21, the cast layer 22 and the silicone layer 12 are stacked in sequence. The silicone layer 12 is tightly attached to the waste area 222 of the cast body. The casting mold 4 is provided with a casting inner frame 41 for punching. The edge of the casting inner frame 41 serves as the casting cutter line 42.

[0070] First, use the casting mold 4 to punch the casting body from bottom to top. Place the casting base film 21 above the casting mold 4 facing away from it. Then, directly peel off the silicone layer 12 and take away the waste area 222 outside the casting inner frame 41 of the casting layer 22. The remaining product area 221 (black position) of the casting layer 22 is obtained.

[0071] After the melt is cast onto the base film 21, it is rapidly cooled to form a flat extruded film without stretching or orientation as the cast layer 22;

[0072] The material of the cast base film 21 is OPP or PET, and in this embodiment, PET is preferred as the substrate.

[0073] The thickness of the cast base film 21 is 25-100μm, with 50μm and 75μm being commonly used. In this embodiment, 50μm is preferred.

[0074] The thickness of the cast layer 22 is 30-40 μm, and is preferably 35 μm in this embodiment;

[0075] like Figure 9 As shown, when the silicone mold 3 and the casting mold 4 are matched, there is a drop of 0.1-1mm between the silicone cutting line 32 and the casting cutting line 42. In this embodiment, it is preferably 0.5mm. Because after the silicone protective film and the casting body are attached together, when the silicone protective film is peeled off, the casting body will be taken away. Theoretically, the casting inner frame 41 is located inside the silicone inner frame 31, that is, the casting cutting line 42 is located inside the silicone cutting line 32.

[0076] On the one hand, this drop distance is to prevent the first and second strokes from overlapping when they are matched. If the drop of the blade line is too small, when the first and second strokes overlap when they are matched, fuzz will be generated. Even when the inner frame 41 of the casting appears outside the inner frame 31 of the silicone, after the waste is discharged, there will be a silicone layer 12 on the product area 221 that cannot be removed. Once it is manually removed, there will be a shortage of product material.

[0077] On the other hand, this drop distance allows the cast layer 22, which is not supported by the silicone layer 12, to be easily carried away when the auxiliary material film 13 is pulled down and the waste material of the silicone layer 12 in the silicone inner frame 31 is taken away. If the drop of the cutting line is too large, the cast layer 22, which is not supported by the silicone layer 12, may not be completely removed when the waste is discharged, causing the cast layer 22 to break.

[0078] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A method for preparing a cast film material, characterized in that, The method includes the following steps: S1. Silicone protective film is rinsed off. The silicone protective film includes a silicone base film (11), a silicone layer (12) and an auxiliary material film (13) stacked in sequence. The silicone mold (3) is provided with a silicone inner frame (31) for punching, and the edge of the silicone inner frame (31) serves as a silicone cutting line (32). First, use a silicone mold (3) to punch and cut the silicone protective film, then pull down the auxiliary material film (13) to remove the waste material of the silicone layer (12) in the silicone inner frame (31), then remove all the silicone base film (11), and attach the casting to the remaining area (121) of the exposed silicone layer (12). S2, two strokes of the cast body The casting body includes a casting base film (21) and a casting layer (22), wherein the casting base film (21), the casting layer (22) and the silicone layer (12) are stacked in sequence, and a casting inner frame (41) for punching is provided on the casting mold (4), the edge of which serves as the casting cutter line (42). First, use the casting mold (4) to punch the casting body, then directly peel off the silicone layer (12) and take away the waste area (222) outside the casting inner frame (41) of the casting layer (22). The remaining product area (221) of the casting layer (22) is obtained to obtain the casting body material.

2. The method for preparing a cast film material according to claim 1, characterized in that, In step S1, a silicone mold (3) is used to punch a silicone protective film from top to bottom, and a silicone base film (11) is placed above the silicone mold (3).

3. The method for preparing a cast film material according to claim 1, characterized in that, In step S1, the silicone base film (11) is made of oriented polypropylene or polyethylene terephthalate. The thickness of the silicone base film (11) is 25-100 μm.

4. The method for preparing a cast film material according to claim 1, characterized in that, In step S1, the thickness of the silicone layer (12) is 5-20 μm; The adhesiveness of the silicone layer (12) is 20-30g.

5. The method for preparing a cast film material according to claim 1, characterized in that, In step S1, the auxiliary material mask (13) is made of oriented polypropylene or polyethylene terephthalate; The thickness of the auxiliary mask (13) is 25-100μm.

6. The method for preparing a cast body material according to claim 1, characterized in that, In step S2, the casting die (4) is used to punch the casting body from bottom to top, and the casting base film (21) is placed above the casting die (4) facing away from it.

7. The method for preparing a cast body material according to claim 1, characterized in that, In step S2, the material of the cast base film (21) is oriented polypropylene or polyethylene terephthalate; The thickness of the cast base film (21) is 25-100 μm.

8. The method for preparing a cast film material according to claim 1, characterized in that, The thickness of the cast layer (22) in step S2 is 30-40 μm.

9. The method for preparing a cast body material according to claim 1, characterized in that, In step S2, when the silicone mold (3) and the casting mold (4) are matched, there is a 0.1-1mm drop between the silicone cutting line (32) and the casting cutting line (42), and the casting cutting line (42) is located inside the silicone cutting line (32).

10. A cast body material, characterized in that, The material is prepared by the method described in any one of claims 1 to 9.

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