Pretreatment method for SAT on special-shaped surface of plastic package body

Abstract

The invention relates to a plastic package body special-shaped surface SAT pretreatment method. The method comprises the following steps that the structure of a package body is analyzed; a proper rough grinding clamp and a proper fine grinding clamp are machined; the packaging body needing to be ground is pasted on a UV film; the UV film is adsorbed in a rough grinding clamp; coarse grinding abrasive paper is used for performing coarse grinding on the packaging body; the UV film is taken down from the rough grinding clamp and loaded into the fine grinding clamp; carrying out fine grinding on the packaging body by using fine grinding abrasive paper; and the UV film is taken down from the fine grinding clamp, and the UV film is degraded, so that the packaging body falls off from the UV film. According to the pretreatment method, the packaging body with a smooth surface is obtained through the processes of analyzing the packaging body, processing a proper clamp, performing rough grinding, performing fine grinding and removing a UV film, so that the requirement of SAT scanning is met.

Description

Technical Field

[0001] The present application relates to a plastic package body processing technology, and in particular to a pre-processing method for SAT of a plastic package body profile surface. Background Art

[0002] SAT (Scanning Acoustic Tomography) ultrasonic scanning is the most commonly used method for checking internal delamination in chip packaging. It is a technology that uses ultrasound to image internal defects in materials. It emits high-frequency ultrasound to the object being tested. When the ultrasound is transmitted to the inside of the workpiece, the acoustic impedance of different materials is different, resulting in different degrees of absorption and reflection of the sound wave by the workpiece. After the reflected or penetrating ultrasonic energy information is processed by the computer, it reflects the image of the inside of the workpiece, thereby helping to detect defects such as delamination, cracks or voids inside the sample.

[0003] When ultrasound encounters a material different from the surrounding material, it is reflected, scattered, absorbed, blocked, etc. The returning sound waves (echoes) are used to image the internal structure. Since sound waves are matter waves, acoustic scanning can reveal package cracks that cannot be detected by X-ray imaging.

[0004] However, when the plastic package has cavities, protrusions on the surface and other irregularities, ultrasonic testing cannot accurately detect the delamination defects between the chip, silver paste and plastic resin in the package, which requires pretreatment of the plastic package. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present application provides a pre-treatment method for SAT of the irregular surface of a plastic package body, which obtains a package body with a smooth surface to meet the requirements of SAT scanning by analyzing the package body, processing a suitable fixture, coarse grinding, fine grinding and UV film removal.

[0006] The technical solution adopted by this application to solve its technical problems is:

[0007] A pre-treatment method for SAT of a plastic package body with an irregular surface, comprising the following steps:

[0008] Analysis: analyzing the structure of the package and defining the size of the package and the irregular-shaped parts of the package;

[0009] Processing fixture: according to the size of the package body, process the appropriate rough grinding fixture and fine grinding fixture;

[0010] Pasting: pasting the package body to be ground on the UV film; first clamping: adsorbing the UV film in the rough grinding fixture, and the special-shaped part of the package body protrudes from the rough grinding fixture;

[0011] Rough grinding: rough grinding the package body with rough grinding sandpaper until the rough grinding sandpaper contacts the rough grinding fixture, and confirming the grinding condition of the package body with a microscope;

[0012] Second clamping: removing the UV film from the rough grinding fixture and placing it into the fine grinding fixture;

[0013] Fine grinding: fine grinding the package body with fine grinding sandpaper until the fine grinding sandpaper contacts the fine grinding fixture, and observing with a microscope to confirm that the package body forms a smooth grinding surface;

[0014] Degrading the UV film: removing the UV film from the fine grinding fixture, and degrading the UV film so that the package falls off the UV film.

[0015] Optionally, the coarse grinding fixture includes a base and a coarse grinding vacuum suction cup installed on the base, and the fine grinding fixture includes a base and a fine grinding vacuum suction cup fixedly installed on the base, and the UV film is adsorbed on the coarse grinding vacuum suction cup or the fine grinding vacuum suction cup.

[0016] Optionally, a first adsorption groove is provided on the coarse grinding vacuum suction cup, and the depth of the first adsorption groove is L1; a second adsorption groove is provided on the fine grinding vacuum suction cup, and the depth of the second adsorption groove is L2, and L1 is greater than L2.

[0017] Optionally, the thickness of the finely ground packaging body is defined as D1, the thickness of the UV film is defined as D2, L2 is equal to the sum of D1 and D2, and the difference between L1 and L2 is 0.1 mm±0.02 mm.

[0018] Optionally, the rough grinding vacuum suction cup is provided with a first vacuum extraction surface and a first adsorption surface which are arranged opposite to each other, the first vacuum extraction surface is provided with a first vacuum cavity, the first adsorption groove is provided with a first adsorption surface, the rough grinding vacuum suction cup is provided with a first suction hole, and the first suction hole is connected to the first vacuum cavity and the first adsorption groove.

[0019] Optionally, the fine grinding vacuum suction cup is provided with a second vacuum extraction surface and a second adsorption surface which are arranged opposite to each other, a second vacuum extraction surface is provided with a second vacuum cavity, a second adsorption groove is provided with a second adsorption surface, a second suction hole is provided with the fine grinding vacuum suction cup, and the second suction hole is connected to the second vacuum cavity and the second adsorption groove.

[0020] Optionally, a vacuum hole is provided on the base, the base is attached to the first vacuum surface or the second vacuum surface, and the vacuum hole is connected to the first vacuum cavity or the second vacuum cavity.

[0021] Optionally, the rough grinding jig and the fine grinding jig are connected to a vacuum generator, and the vacuum generator generates a vacuum in the rough grinding jig and the fine grinding jig to adsorb the UV film.

[0022] Optionally, the coarse sandpaper is 600-grit sandpaper, and the fine sandpaper is 2000-grit sandpaper. During grinding, the coarse sandpaper or the fine sandpaper is placed on a flat stainless steel plate or marble plate.

[0023] Optionally, SAT scanning is also included: the ground package is loaded onto a conventional scanning film and a conventional SAT scanning is performed.

[0024] The beneficial effects of the present application are as follows: the pre-treatment method of the present application obtains a package with a smooth surface to meet the requirements of SAT scanning by analyzing the package, processing a suitable fixture, rough grinding, fine grinding and UV film removal, thereby solving the problem that the package with a special-shaped surface cannot be scanned by SAT. The pre-treatment method provides a grinding positioning method that can be accurately executed through a suitable rough grinding fixture and a fine grinding fixture, and can perform fool-proof and efficient grinding, is simple to operate, has good grinding accuracy and high speed, and the same set of fixtures can be reused for products with the same type of special-shaped surfaces, and the processing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the base in this application;

[0026] Figure 2 One of the structural schematic diagrams of the rough grinding vacuum suction cup in this application;

[0027] Figure 3 This is the second structural schematic diagram of the rough grinding vacuum suction cup in this application;

[0028] Figure 4 This is the third structural schematic diagram of the rough grinding vacuum suction cup in this application;

[0029] Figure 5 This is one of the structural schematic diagrams of the fine grinding vacuum suction cup in this application;

[0030] Figure 6 This is the second structural schematic diagram of the fine grinding vacuum suction cup in this application;

[0031] Figure 7 This is a schematic diagram of the structure of the UV film combined with the packaging body in this application;

[0032] Figure 8 This is a schematic diagram of the structure of the rough grinding fixture after loading the UV film in this application;

[0033] Fig. 9 This is one of the exploded views of the rough grinding fixture after loading the UV film in this application;

[0034] Fig.10 This is the second exploded view of the rough grinding fixture after loading the UV film in this application;

[0035] Fig.11 This is the third exploded view of the rough grinding fixture after loading the UV film in this application;

[0036] In the figure: 10-base, 11-vacuuming hole, 20-coarse grinding vacuum suction cup, 21-first vacuuming surface, 22-first vacuum cavity, 23-first adsorption surface, 24-first adsorption groove, 25-first suction hole, 30-fine grinding vacuum suction cup, 31-second vacuuming surface, 32-second vacuum cavity, 33-second adsorption surface, 34-second adsorption groove, 35-second suction hole, 40-UV film, 50-packaging body. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the embodiments described in the present application are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the following drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0040] like Figure 1-11 As shown, a pre-treatment method for SAT of a plastic package body with an irregular surface includes the following steps:

[0041] Analysis: Analyze the structure of the package body 50 and define the size of the package body 50 and the irregularly shaped part of the package body 50; determine the part of the package body 50 that needs to be ground off, i.e., the irregularly shaped part of the package body, according to the structure of the package body 50, and determine the thickness of the package body 50 that needs to be retained, i.e., the thickness of the package body 50 after fine grinding;

[0042] Processing fixture: Processing a suitable rough grinding fixture and fine grinding fixture according to the size of the package body 50; specifically, designing and processing the rough grinding fixture and fine grinding fixture according to the determined thickness of the package body 50 after grinding, so as to achieve a foolproof effect;

[0043] Paste: Paste the package body 50 to be ground onto the UV film 40; Figure 7 As shown, multiple packaging bodies 50 can be pasted on a UV film 40 at the same time;

[0044] First clamping: the UV film 40 is adsorbed in the rough grinding fixture, and the irregular-shaped portion of the package body 50 protrudes from the rough grinding fixture so as to grind off the irregular-shaped portion on the package body 50;

[0045] Rough grinding: The package body 50 is rough ground with rough sandpaper until the rough sandpaper contacts the rough grinding fixture, and the grinding condition of the package body 50 is confirmed with a microscope; the purpose of rough grinding is to grind off the irregularly shaped part of the package body 50, remove dust after grinding, and then confirm whether the irregularly shaped part has been completely removed by observation with a microscope;

[0046] Second clamping: removing the UV film 40 from the rough grinding fixture and placing it into the fine grinding fixture;

[0047] Fine grinding: Fine grinding the package body 50 with fine grinding sandpaper until the fine grinding sandpaper contacts the fine grinding fixture, and observe with a microscope to confirm that the package body 50 forms a smooth grinding surface; the purpose of fine grinding is to grind the surface of the package body 50 flat to ensure a consistent smooth surface;

[0048] Degrading the UV film: removing the UV film 40 from the fine grinding fixture, and degrading the UV film 40 so that the packaging body 50 falls off the UV film 40 .

[0049] The pre-treatment method in the present application obtains a package 50 with a smooth surface to meet the requirements of SAT scanning by analyzing the package 50, processing a suitable fixture, rough grinding, fine grinding, and UV film removal, thereby solving the problem that the package with a special-shaped surface cannot be scanned by SAT. The pre-treatment method provides a grinding positioning method that can be accurately executed through a suitable rough grinding fixture and a fine grinding fixture, and can perform fool-proof and efficient grinding, grinding to the fixture surface, simple operation, good grinding accuracy, fast speed, the same set of fixtures can be reused for the same type of special-shaped surface products, low processing cost, and can meet the versatility of SAT product pre-treatment with special-shaped surfaces.

[0050] like Figure 1-11 As shown, the rough grinding fixture includes a base 10 and a rough grinding vacuum suction cup 20 mounted on the base 10, and the fine grinding fixture includes a base 10 and a fine grinding vacuum suction cup 30 fixedly mounted on the base 10, and the UV film 40 is adsorbed on the rough grinding vacuum suction cup 20 or the fine grinding vacuum suction cup 30. The UV film 40 is adsorbed by the vacuum suction cup to ensure the stability of the adsorption of the UV film 40. The package body 50 on the UV film 40 faces the open end of the rough grinding vacuum suction cup 20 or the fine grinding vacuum suction cup 30.

[0051] like Figure 3-6 As shown, the rough grinding vacuum chuck 20 is provided with a first adsorption groove 24, the depth of which is L1, and the fine grinding vacuum chuck 30 is provided with a second adsorption groove 34, the depth of which is L2, and L1 is greater than L2. That is, the adsorption groove for fine grinding is shallower than the adsorption groove for rough grinding, so that a little processing margin can be left for the package body 50 after rough grinding, so as to facilitate the subsequent fine grinding process, ensure that the package body 50 has a smooth surface after fine grinding, and improve the accuracy of the SAT scanning result.

[0052] Optionally, the thickness of the package body 50 after fine grinding is defined as D1, the thickness of the UV film 40 is defined as D2, L2 is equal to the sum of D1 and D2, and the difference between L1 and L2 is 0.1 mm ± 0.02 mm. According to the overall size of the package body 50, a processing allowance of about 0.1 mm is left to facilitate fine grinding after rough grinding.

[0053] like Figure 2-4 As shown, the rough grinding vacuum suction cup 20 is provided with a first vacuuming surface 21 and a first adsorption surface 23 arranged opposite to each other, the first vacuuming surface 21 is provided with a first vacuum cavity 22, the first adsorption surface 23 is provided with a first adsorption groove 24, the rough grinding vacuum suction cup 20 is provided with a first suction hole 25, and the first suction hole 25 is connected to the first vacuum cavity 22 and the first adsorption groove 24. During rough grinding, the first vacuuming surface 21 is attached to the base 10, the smooth surface of the UV film 40 is attached to the bottom of the first adsorption groove 24, the external vacuum device is connected to the first vacuum cavity 22, and the first vacuum cavity 22 adsorbs the UV film 40 through the first suction hole 25.

[0054] like Figure 5-6 As shown, the fine grinding vacuum suction cup 30 is provided with a second vacuuming surface 31 and a second adsorption surface 33 arranged opposite to each other, the second vacuuming surface 31 is provided with a second vacuum cavity 32, the second adsorption surface 33 is provided with a second adsorption groove 34, the fine grinding vacuum suction cup 30 is provided with a second suction hole 35, and the second suction hole 35 is connected to the second vacuum cavity 32 and the second adsorption groove 34. During fine grinding, the second vacuuming surface 31 is attached to the base 10, the smooth surface of the UV film 40 is attached to the bottom of the second adsorption groove 34, the external vacuum device is connected to the second vacuum cavity 32, and the second vacuum cavity 32 adsorbs the UV film 40 through the second suction hole 35.

[0055] like Figure 1 As shown, the base 10 is provided with a vacuum hole 11, the base 10 is attached to the first vacuum surface 21 or the second vacuum surface 31, and the vacuum hole 11 is connected to the first vacuum cavity 22 or the second vacuum cavity 32. The base 10 can be applied to fine grinding vacuum suction cups 30 and coarse grinding vacuum suction cups 20 of various specifications.

[0056] The rough grinding fixture and the fine grinding fixture are connected to a vacuum generator, and the vacuum generator generates a vacuum in the rough grinding fixture and the fine grinding fixture to adsorb the UV film 40. That is, the vacuum generator is connected to the vacuum hole 11 of the base 10, and the vacuum hole 11 forms a vacuum in the first vacuum cavity 22 or the second vacuum cavity 32.

[0057] Optionally, the coarse sandpaper is 600 sandpaper, and the fine sandpaper is 2000 sandpaper. During grinding, the coarse sandpaper or the fine sandpaper is placed on a flat stainless steel plate or marble plate to ensure the grinding effect.

[0058] After pre-processing the special-shaped package, directly perform SAT scanning on the package 50: load the polished package 50 onto a conventional scanning film and perform conventional SAT scanning. Through SAT scanning, defects such as silver paste-frame, silver paste-substrate, chip-silver paste, chip-resin, resin-substrate, resin-silver paste, and resin voids near the chip can be noticed inside the package 50.

[0059] Embodiment 1: The pre-treatment method of SAT on the irregular surface of the plastic package body comprises the following steps:

[0060] Step 1: Analysis: Analyze the structure of the package 50 and define the size of the package 50 and the irregular-shaped part of the package 50; the specific process is as follows:

[0061] After analysis, the package 50 is a cavity structure. Since the SAT scan needs to analyze the layering around the chip in the package 50, the cover part is not needed. Therefore, before the analysis, the package does not need to be covered, and the semi-finished package encapsulated with transparent epoxy resin is directly analyzed.

[0062] Since the transparent epoxy has a hemispherical head structure, the hemispherical head structure needs to be processed. From a structural point of view, the chip is at the bottom of the hemispherical head structure. The hemispherical head needs to be ground off during processing. After removing the hemispherical head, the thickness of the package containing the chip is 0.4mm, and the thickness of the ball head is 0.3mm. Therefore, the pre-processing before SAT needs to remove the protrusions and retain the 0.4mm thickness of the package to ensure the integrity of the chip and the bonding point; that is, the thickness of the package 50 after fine grinding is 0.4mm;

[0063] Step 2: Processing fixtures: Processing suitable rough grinding fixtures and fine grinding fixtures according to the size of the package body 50; the details are as follows:

[0064] 2.1 Design Principles

[0065] Usually, each reliability test requires at least 25 products. For common QFN products, a relatively large package size needs to be considered, such as 5mm*5mm. Grind 25 packages at a time, 50 or even more, and grind them flat at the same time. Consider using a 100mm*100mm area size fixture.

[0066] During the test, all products were first pasted on the UV film 40, and then the UV film 40 was adsorbed on the fixture. The thickness of the UV film 40 was 0.12mm;

[0067] In order to ensure the consistency of the ground products, the depth of the adsorption groove where the product on the UV film 40 is sucked into the fixture is designed to be 0.4mm+0.12mm (film thickness), with a convex circle on the edge. In this way, grinding can be carried out based on this thickness distance;

[0068] Manual grinding with sandpaper, when grinding to a given thickness, you can directly see the thickness of the product;

[0069] 2.2 Processing instructions

[0070] In order to improve the consistency of the surface of the package body 50 after grinding, the package body 50 is divided into two processes of rough grinding and fine grinding, and matching rough grinding fixtures and fine grinding fixtures are designed. The rough grinding fixture includes a base 10 and a rough grinding vacuum suction cup 20 installed on the base 10, and the fine grinding fixture includes a base 10 and a fine grinding vacuum suction cup 30 fixedly installed on the base 10. The depth of the first adsorption groove 24 in the rough grinding vacuum suction cup 20 is designed to be 0.5mm+0.12mm (film thickness), and the depth of the second adsorption groove 34 in the fine grinding vacuum suction cup 30 is designed to be 0.4mm+0.12mm (film thickness). The fine grinding fixture is mainly characterized in that the grinding depth is 0.1mm shallower than the rough grinding;

[0071] The coarse grinding vacuum suction cup 20 and the fine grinding vacuum suction cup 30 are made of stainless steel. A vacuum hole 11 is directly provided on the base 10. The vacuum is connected from an external air pipe. A compressed gas vacuum generator is used for the vacuum, which is convenient for subsequent use only in compressed gas occasions.

[0072] Step 3: Paste: Figure 7 As shown, the package body 50 to be ground is pasted on the UV film 40;

[0073] Step 4: First clamping: Use a vacuum generator to adsorb the UV film 40 into the first adsorption groove 24 of the rough grinding vacuum suction cup 20, the irregularly shaped part of the package body 50 protrudes from the rough grinding fixture, and the edge of the UV film 40 can be sealed with tape;

[0074] Step 5: Rough grinding: Place a No. 600 rough grinding sandpaper on a flat stainless steel plate or marble plate, and use the rough grinding sandpaper to rough grind the package 50 until the rough grinding sandpaper contacts the first adsorption surface 23 of the rough grinding vacuum suction cup 20, and use a microscope to confirm the grinding condition of the package 50, and use compressed air to blow away the grinding dust;

[0075] Step 6: Second clamping: remove the UV film 40 from the rough grinding fixture, and use the same method as step 4 to adsorb the UV film 40 into the second adsorption groove 34 of the fine grinding vacuum suction cup 30;

[0076] Step 7: Fine grinding: Using the same method as step 5, the package body 50 is finely ground using 2000 fine grinding sandpaper until the fine grinding sandpaper contacts the second adsorption surface 33 of the fine grinding vacuum suction cup 30, and a microscope is used to observe to confirm that the package body 50 forms a smooth grinding surface, and compressed air is used to blow away the grinding dust;

[0077] Step 8: degrading the UV film: removing the UV film 40 from the fine grinding fixture, and degrading the UV film 40 so that the package 50 falls off the UV film 40. The degradation of the UV film 40 may be performed by ultraviolet irradiation;

[0078] SAT scanning: The ground package 50 is loaded onto a conventional scanning film and subjected to conventional SAT scanning.

[0079] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these modifications and improvements are all within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the attached claims.

Claims

1. A pre-treatment method for SAT of a plastic-encapsulated body with a special-shaped surface, characterized in that: The steps include: Analysis: analyzing the structure of the package (50) and defining the size of the package (50) and the irregular-shaped parts of the package (50); Processing fixture: processing a suitable rough grinding fixture and a fine grinding fixture according to the size of the package body (50); Pasting: pasting the package body (50) to be ground onto the UV film (40); First clamping: the UV film (40) is adsorbed in a rough grinding fixture, and the irregularly shaped portion of the package body (50) protrudes from the rough grinding fixture; Rough grinding: using rough grinding sandpaper to rough grind the package (50) until the rough grinding sandpaper contacts the rough grinding fixture, and using a microscope to confirm the grinding condition of the package (50); Second clamping: removing the UV film (40) from the rough grinding fixture and placing it into the fine grinding fixture; Fine grinding: fine grinding the package body (50) with fine grinding sandpaper until the fine grinding sandpaper contacts the fine grinding fixture, and observing with a microscope to confirm that a smooth grinding surface is formed on the package body (50); Degrading the UV film: removing the UV film (40) from the fine grinding fixture, and degrading the UV film (40) so that the packaging body (50) falls off the UV film (40).

2. The pre-treatment method for SAT of the irregular surface of the plastic package body according to claim 1, characterized in that: The rough grinding fixture comprises a base (10) and a rough grinding vacuum suction cup (20) mounted on the base (10); the fine grinding fixture comprises a base (10) and a fine grinding vacuum suction cup (30) fixedly mounted on the base (10); and the UV film (40) is adsorbed on the rough grinding vacuum suction cup (20) or the fine grinding vacuum suction cup (30).

3. The pre-treatment method for SAT of the irregular surface of the plastic package body according to claim 2, characterized in that: The coarse grinding vacuum suction cup (20) is provided with a first adsorption groove (24), the depth of which is L1; the fine grinding vacuum suction cup (30) is provided with a second adsorption groove (34), the depth of which is L2, and L1 is greater than L2.

4. The pre-treatment method for SAT of the irregular surface of the plastic package body according to claim 3, characterized in that: The thickness of the finely ground packaging body (50) is defined as D1, the thickness of the UV film (40) is defined as D2, L2 is equal to the sum of D1 and D2, and the difference between L1 and L2 is 0.1 mm±0.02 mm.

5. The pre-treatment method for SAT of the irregular surface of the plastic package body according to claim 3, characterized in that: The rough grinding vacuum suction cup (20) is provided with a first vacuum extraction surface (21) and a first adsorption surface (23) which are arranged opposite to each other; the first vacuum extraction surface (21) is provided with a first vacuum cavity (22); the first adsorption surface (23) is provided with a first adsorption groove (24); the rough grinding vacuum suction cup (20) is provided with a first suction hole (25); the first suction hole (25) is connected to the first vacuum cavity (22) and the first adsorption groove (24).

6. The pre-treatment method for SAT of the irregular surface of the plastic package body according to claim 5, characterized in that: The fine grinding vacuum suction cup (30) is provided with a second vacuum extraction surface (31) and a second adsorption surface (33) which are arranged opposite to each other; the second vacuum extraction surface (31) is provided with a second vacuum cavity (32); the second adsorption surface (33) is provided with a second adsorption groove (34); the fine grinding vacuum suction cup (30) is provided with a second suction hole (35); the second suction hole (35) is connected to the second vacuum cavity (32) and the second adsorption groove (34).

7. The pre-treatment method for SAT of the irregular surface of the plastic package body according to claim 6, characterized in that: The base (10) is provided with a vacuum hole (11), the base (10) is attached to the first vacuum surface (21) or the second vacuum surface (31), and the vacuum hole (11) is connected to the first vacuum cavity (22) or the second vacuum cavity (32).

8. The pre-treatment method for SAT of the irregular surface of a plastic package body according to claim 1, characterized in that: The rough grinding jig and the fine grinding jig are connected to a vacuum generator, and the vacuum generator generates a vacuum inside the rough grinding jig and the fine grinding jig to adsorb the UV film (40).

9. The pre-treatment method for SAT of the irregular surface of a plastic package body according to claim 1, characterized in that: The coarse sandpaper is 600# sandpaper, and the fine sandpaper is 2000# sandpaper. During grinding, the coarse sandpaper or the fine sandpaper is placed on a flat stainless steel plate or marble plate.

10. The pre-treatment method for SAT of the irregular surface of a plastic package body according to claim 1, characterized in that: It also includes SAT scanning: the ground package (50) is loaded onto a conventional scanning film and a conventional SAT scanning is performed.

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