Block laminated structure

Abstract

The utility model relates to the technical field of ceramic capacitors, in particular to a block laminated structure. The block laminated structure comprises an upper pressing plate, a first plastic film, a block, a second plastic film and a laminated plate which are sequentially laminated from top to bottom, wherein the lower surface, facing one side of the first plastic film, of the upper pressing plate is a flat and smooth plane, the upper pressing plate is an aluminum plate, and the surface of the upper pressing plate is provided with a Teflon layer. According to the block lamination structure provided by the utility model, the block can be prevented from being extruded and deformed in a high-temperature and high-pressure process, the internal compactness and the surface smoothness of the laminated block are improved, the problems of surface cutting deviation and single-side pillow shape of a cut chip are solved, meanwhile, the cutting yield is improved, and the chip crack defect is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic capacitors, in particular to a block laminate structure. Background Art

[0002] The production process of MLCC (ceramic capacitor) is: batching → casting → printing → stacking → lamination → cutting → debinding → sintering, etc. The block forming mainly relies on high-temperature and high-pressure laminators. At present, the lamination method of MLCC mainly adopts isostatic hydropressing and then cutting into chips.

[0003] At present, the packaging and lamination structure of the bar block before lamination is: PET film, bar block, PET film, laminated board are stacked in sequence from top to bottom; then the back-end process will process the laminated structure in sequence through packaging, vacuum sealing, and lamination. For small-sized bar blocks (≤0402 specifications), the existing packaging process and lamination structure are used for vacuum lamination. Due to the small size of the bar block, the gap between the graphics is small, that is, the gap between the printed graphics (electrodes) is small. When subjected to high temperature and high pressure, the organic matter in the bar block will soften and deform due to the temperature and pressure, resulting in bar block deformation and size deviation problems, which will lead to the bar block being cut after forming, and the resulting chip will have problems such as cutting deviation and one-sided pillow shape, and the cutting yield is low, which leads to problems such as cracks after debinding. Utility Model Content

[0004] In order to solve the deficiencies of the prior art in the above background technology, the utility model provides a block laminate structure, and its technical solution is as follows:

[0005] The bar-block laminated structure includes an upper pressing plate, a first plastic film, a bar-block, a second plastic film, and a laminated plate stacked in sequence from top to bottom; wherein the lower surface of the upper pressing plate facing the first plastic film is a flat and smooth plane, and the upper pressing plate is an aluminum plate, and the surface of the upper pressing plate has a Teflon layer.

[0006] In some embodiments, the upper pressing plate is an aviation aluminum alloy plate having a Teflon layer on the surface.

[0007] In some embodiments, the horizontal area of ​​the upper pressing plate is smaller than the horizontal area of ​​the bar block, so that the outer edge of the upper pressing plate is 1-2 mm away from the outer edge of the bar block.

[0008] In some embodiments, the thickness of the upper pressing plate is 0.9-1.1 mm.

[0009] In some embodiments, the upper pressing plate is a rectangular flat plate structure, and its four corners are configured as rounded structures.

[0010] In some embodiments, the chamfer radius R of the rounded corner structure is 4.8-1.1 mm.

[0011] In some embodiments, the first plastic film and / or the second plastic film is made of PET.

[0012] In some embodiments, the horizontal area of ​​the first plastic film and / or the second plastic film is larger than the horizontal area of ​​the bar block, and the outer edges of the first plastic film and / or the second plastic film extend beyond the outer edges of the bar block so that the upper surface and the lower surface of the bar block are completely covered by the first plastic film and the second plastic film respectively.

[0013] In some embodiments, the horizontal area of ​​the laminate is greater than the horizontal area of ​​the bar, such that the outer edge of the laminate extends beyond the outer edge of the bar.

[0014] In some embodiments, the upper surface of the laminate facing the second plastic film is a flat and smooth plane, and the laminate is an aluminum plate with a Teflon layer on the surface.

[0015] Based on the above, compared with the prior art, the block laminate structure provided by the utility model has the following beneficial effects:

[0016] The bar block lamination structure provided by the utility model can prevent the bar blocks from being squeezed and deformed during high temperature and high pressure processes, improve the internal density and surface flatness of the bar blocks after lamination, solve the problems of surface cutting deviation and single-sided pillow shape of cut chips, improve the cutting yield, and effectively reduce chip crack defects.

[0017] Other features and beneficial effects of the utility model will be described in the subsequent description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other beneficial effects of the utility model can be achieved and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The positional relationships described in the drawings in the following description are based on the directions of the components shown in the diagrams unless otherwise specified.

[0019] Figure 1 A schematic diagram of a laminated structure of a block provided in an embodiment of the utility model Figure 1 ;

[0020] Figure 2 A schematic diagram of a laminated structure of a block provided in an embodiment of the utility model Figure 2 .

[0021] Reference numerals: 100 upper pressing plate, 200 first plastic film, 300 bar block, 400 second plastic film, 500 laminated plate. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments; the technical features designed in different implementation modes of the utility model described below can be combined with each other as long as they do not conflict with each other; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that all terms (including technical terms and scientific terms) used in the present invention have the same meanings as those generally understood by ordinary technicians in the field to which the present invention belongs, and cannot be understood as limitations on the present invention; it should be further understood that the terms used in the present invention should be understood to have meanings consistent with the meanings of these terms in the context of this specification and in the relevant fields, and should not be understood in an idealized or overly formal sense, unless explicitly defined in this utility model.

[0024] The existing bar block lamination structure and process are: PET film, bar block 300, PET film, and laminate 500 are stacked in sequence from top to bottom; and the defect of this structure is: during lamination, since there is only PET film on the upper surface of the bar block 300, at high temperature (60-80°C), the organic resin in the bar block 300 will soften. As the lamination pressure increases (greater than 80Mpa), the bar block 300 will gradually extend and deform in the direction without laminate 500 (i.e. upward), eventually causing the chip to be pillow-shaped and cut off-center on one side after cutting, resulting in cracks in the chip after debinding and sintering.

[0025] The utility model is to solve this problem, provide Figure 1-2The block laminate structure shown includes an upper pressing plate 100, a first plastic film 200, a block 300, a second plastic film 400, and a laminate 500 stacked in sequence from top to bottom; wherein the lower surface of the upper pressing plate 100 facing the first plastic film 200 is a flat and smooth plane, and the upper pressing plate 100 is an aluminum plate, and the surface of the upper pressing plate 100 has a Teflon layer.

[0026] Specifically, an aluminum plate (i.e., upper pressing plate 100) is arranged above the bar block 300, and its surface facing the first plastic film 200 is a flat and smooth plane, and has been hardened with Teflon; the surface of the aluminum plate is electroplated with Teflon, which can improve the hardness, increase the surface finish, and improve the service life. The upper pressing plate 100 with this material and structural design makes the interior of the bar block 300 after lamination denser and the surface smoother, and there is no pillow-shaped problem after cutting, and there is no crack problem after product debinding and sintering. In summary, this design can avoid the bar block 300 from being squeezed and deformed during high temperature and high pressure, improve the internal density and surface flatness of the bar block 300 after lamination, solve the problem of cutting deviation and unilateral pillow shape of the surface of the cut chip, improve the cutting yield, and effectively reduce chip crack defects. In addition, the design of the first plastic film 200 and the second plastic film 400 can prevent the bar block 300 from adhering to the upper pressing plate 100, the laminating plate 500 or the laminating bag set on the outside.

[0027] It should be noted that:

[0028] The "aluminum plate" is an existing aluminum plate or aluminum alloy plate. Preferably, the upper pressing plate 100 is preferably an aviation aluminum alloy plate, which is an aviation aluminum alloy plate with a Teflon layer on the surface. The aviation aluminum alloy plate material used in the embodiments of this article is an existing commercially available material, which can be obtained from the market by those skilled in the art.

[0029] Preferably, the horizontal area of ​​the upper pressing plate 100 is smaller than the horizontal area of ​​the bar block 300, so that the outer edge of the upper pressing plate 100 is 1 to 2 mm away from the outer edge of the bar block 300 (i.e. Figure 2 Middle distance L).

[0030] The outer edge size is designed to be 1-2mm smaller than the size of the bar block 300 because: if the upper pressing plate 100 is larger than the bar block 300, its outer edge will extend out, and the upper pressing plate 100 outside the bar block 300 will be suspended in the air, which is easy to deform and scrap under the high lamination pressure; and because after lamination, the cutting line of the bar block 300 extending out of the outer edge of the upper pressing plate 100 will be used as edge material and cut flat by a trimming machine (generally, the outer edge of the bar block 300 is cut 2-3mm after lamination). Designing a 1-2mm spacing can not only prevent the upper pressing plate 100 from being suspended and scrapped, but also does not affect the subsequent quality of the bar block 300.

[0031] The “horizontal plane” mentioned herein refers to a plane perpendicular to the “from top to bottom” direction mentioned herein, wherein the lower surface of the upper pressing plate 100 is parallel to the plane.

[0032] Preferably, the thickness D of the upper pressing plate 100 is 0.9-1.1 mm.

[0033] According to this thickness design, the upper pressing plate 100 after lamination is not easy to deform and has good lamination resilience; if its thickness is too thin, it will not have much effect on suppressing the pillow shape of the product; if its thickness is too thick, there will be a large height difference with the bar block, and after lamination, the laminating bag on the outside will be easily damaged and difficult to recover after deformation.

[0034] The thickness is calculated as the distance between the upper surface and the lower surface from top to bottom.

[0035] Preferably, the upper pressing plate 100 is a rectangular flat plate structure, and its four corners are provided with rounded corner structures. Preferably, the chamfer radius R of the rounded corner structure is 4.8-1.1 mm.

[0036] The chamfer design is adopted to prevent the sharp part of the upper pressing plate 100 from accidentally damaging the block 300, and also facilitates operation.

[0037] Preferably, the first plastic film 200 and / or the second plastic film 400 is made of PET.

[0038] The present embodiment adopts PET material to prevent the block 300 from adhering to the upper pressing plate 100, the laminating plate 500 or the laminating bag set outside. According to the design concept of the present application, other existing plastic materials that can achieve the anti-adhesion function can also be used, including but not limited to PET material.

[0039] Among them, PET plastic is the abbreviation of Poly terephthalate in English, abbreviated as PET or PETP, and in Chinese it means: polyethylene terephthalate plastic.

[0040] Preferably, the horizontal area of ​​the first plastic film 200 and / or the second plastic film 400 is larger than the horizontal area of ​​the block 300, and the outer edges of the first plastic film 200 and / or the second plastic film 400 extend beyond the outer edges of the block 300, so that the upper surface and the lower surface of the block 300 are completely covered by the first plastic film 200 and the second plastic film 400, respectively.

[0041] The above-described design of the first plastic film 200 and / or the second plastic film 400 can effectively prevent the block 300 from adhering to the upper pressing plate 100, the laminating plate 500 or the laminating bag mounted externally.

[0042] Preferably, the upper surface of the laminate 500 facing the second plastic film 400 is a flat and smooth plane, and the laminate 500 is an aluminum plate with a Teflon layer on the surface. It is further preferred that the aluminum plate is an aviation aluminum alloy plate. Preferably, the horizontal area of ​​the laminate 500 is larger than the horizontal area of ​​the bar block 300, so that the outer edge of the laminate 500 extends beyond the outer edge of the bar block 300. The above design is used to improve the quality of the bar block 300 after lamination.

[0043] In order to verify the effect of the block laminate structure provided in the embodiment of the present application, the following verification experiment is provided:

[0044] Verification experiment (experiment number 5-12 in Table 1, experiment number 6-14 in Table 2): The laminated structure provided in the embodiment is an upper pressing plate, a PET film, a bar block, a PET film, and a laminated plate stacked in sequence from top to bottom;

[0045] Comparative experiment (experiment number 1-4 in Table 1, experiment number 1-5 in Table 2): the existing bar block lamination structure is PET film, bar block, PET film, and laminated board stacked in sequence from top to bottom;

[0046] The only difference between the verification experiment and the comparative experiment is the design of the upper pressure plate, and other design parameters such as materials and dimensions remain consistent.

[0047] The upper pressing plate is made of an aviation aluminum alloy plate with a Teflon layer on the surface, and its horizontal area is smaller than the area of ​​the bar block, so that the outer edge of the upper pressing plate is 1.5 mm away from the outer edge of the bar block (i.e. Figure 2 The thickness D of the upper pressing plate is 1 mm; the upper pressing plate is a rectangular flat plate structure, and the four corners thereof are arranged as rounded structures, and the chamfer radius R is 5.0 mm.

[0048] 1. Under the same lamination temperature (take 75℃ as this test), different lamination pressure experiments are compared. The results are shown in Table 1:

[0049] Table 1

[0050]

[0051] 2. Under the same lamination pressure (take 140MPa as this test), the comparative experiment of different lamination temperatures, the results are shown in Table 2:

[0052] Table 2

[0053]

[0054] In the comparative experiment using the existing bar block laminate structure, the bar block had a pillow shape problem after cutting, cracks occurred after debinding, and cracks occurred in the chip after sintering;

[0055] In the verification experiment of the bar-block laminated structure of the embodiment of the present application, no pillow-shape problem occurred after the bar-block was cut, no cracks were generated after debinding, and no cracks were generated after the chip was sintered.

[0056] In summary, combined with the above content, the effect of the embodiment of the present application can be well reflected: the bar block lamination structure provided by the embodiment of the utility model can avoid the bar blocks from being squeezed and deformed during high temperature and high pressure, improve the internal density and surface flatness of the bar blocks after lamination, solve the problems of surface cutting deviation and one-sided pillow shape of the cut chip, while improving the cutting yield and effectively reducing chip crack defects.

[0057] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the utility model can be improved in only one or several aspects, without having to solve all the technical problems listed in the prior art or background technology at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be used as a limitation on the claim.

[0058] Although the terms such as upper pressing plate, first plastic film, block, second plastic film, laminated board, etc. are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model; the terms "first", "second", etc. (if any) in the description and claims of the embodiment of the utility model and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A block laminate structure, characterized in that: It comprises an upper pressing plate (100), a first plastic film (200), a block (300), a second plastic film (400), and a laminate (500) which are stacked in sequence from top to bottom; The lower surface of the upper pressing plate (100) facing the first plastic film (200) is a flat and smooth plane, the upper pressing plate (100) is an aluminum plate, and the surface of the upper pressing plate (100) has a Teflon layer.

2. The block laminate structure according to claim 1, characterized in that: The upper pressing plate (100) is an aviation aluminum alloy plate having a Teflon layer on the surface.

3. The block laminate structure according to claim 1, characterized in that: The horizontal area of ​​the upper pressing plate (100) is smaller than the horizontal area of ​​the bar block (300), so that the outer edge of the upper pressing plate (100) is 1 to 2 mm away from the outer edge of the bar block (300).

4. The block laminate structure according to claim 1, characterized in that: The thickness of the upper pressing plate (100) is 0.9-1.1 mm.

5. The block laminate structure according to claim 1, characterized in that: The upper pressing plate (100) is a rectangular flat plate structure, and its four corners are arranged as rounded structures.

6. The block laminate structure according to claim 5, characterized in that: The chamfer radius R of the rounded corner structure is 4.8-1.1 mm.

7. The block laminate structure according to claim 1, characterized in that: The material of the first plastic film (200) and / or the second plastic film (400) is PET.

8. The block laminate structure according to claim 1, characterized in that: The horizontal area of ​​the first plastic film (200) and / or the second plastic film (400) is larger than the horizontal area of ​​the block (300), and the outer edges of the first plastic film (200) and / or the second plastic film (400) extend beyond the outer edges of the block (300), so that the upper surface and the lower surface of the block (300) are completely covered by the first plastic film (200) and the second plastic film (400), respectively.

9. The bar block laminate structure according to claim 1, characterized in that: The horizontal area of ​​the laminate (500) is greater than the horizontal area of ​​the bar block (300), so that the outer edge of the laminate (500) extends beyond the outer edge of the bar block (300).

10. The bar block laminate structure according to claim 1, characterized in that: The upper surface of the laminate (500) facing the second plastic film (400) is a flat and smooth plane, and the laminate (500) is an aluminum plate with a Teflon layer on the surface.

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