Method for improving loss in chip film turning operation

Abstract

The invention relates to a method for improving loss in chip film turning operation, which belongs to the field of subsequent film turning operation of an LED (light-emitting diode) manufacture procedure, and is characterized in that a cloth hammer is added to press a film, and the position where a chip is staggered in the step (5) is manually pressed by the cloth hammer or pressed by the cloth hammer while the film is uncovered until the film turning is finished. According to the method for improving the loss in the chip film turning operation, one-step operation of film pressing by a self-made cloth hammer and film pressing and film uncovering at the same time is added on the basis of the condition of chip dislocation loss occurring in film turning after film pressing by an original film pressing machine, so that the condition of chip dislocation loss occurring in the operation of an original pure film pressing machine is effectively solved; the problems existing in the production process are effectively solved, and the actual output number is effectively increased. On the basis of the existing mature conventional operation method, the process method is further optimized and updated according to the film turning operation principle, the advantages are made up for the disadvantages, the existing abnormal problems are effectively solved, and the process improvement effect is obvious.

Description

Technical Field

[0001] The invention relates to a method for improving chip film flipping operation loss, belonging to the technical field of post-film flipping operation of LED manufacturing process. Background Art

[0002] As a new lighting source in the 21st century, LED consumes only 1 / 10 of the power of ordinary incandescent lamps at the same brightness, but its life span can be extended by 100 times. LED devices are cold light sources with high luminous efficiency, low operating voltage, low power consumption, small size, flat packaging, easy development of thin and light products, strong structure and long life. The light source itself does not contain harmful substances such as mercury and lead, no infrared and ultraviolet pollution, and will not cause pollution to the outside world during production and use. Therefore, semiconductor lamps have the characteristics of energy saving, environmental protection, and long life. Just as transistors replace electron tubes, semiconductor lamps will replace traditional incandescent lamps and fluorescent lamps, which will also be the general trend. Whether from the perspective of saving electricity, reducing greenhouse gas emissions, or reducing environmental pollution, LED as a new lighting source has great potential to replace traditional lighting sources. LED chips have high luminous efficiency, wide color range, and long service life. They have been widely used in various fields such as large-screen display, backlight, landscape lighting, traffic lights, and car status display.

[0003] In the LED chip preparation process, after the chip is cleaned, evaporated, photolithography, ground, cut and other processes, it is transformed into independent tube cores and adhered to the blue film. Then, it is further turned into finished products for storage after turning over the film, inspection, grading and other steps. Therefore, it can be seen that the process operations at the back end of the chip are directly related to the blue film. In the actual turning over process, it mainly relies on manual action to turn over the film. There are differences in the adhesion between the film and the chip, and between the films. In the turning over process, the chip often adheres to the original blue film and does not turn over. The chip that is not turned over will cause the position of the chip to be misaligned, resulting in chip loss. Therefore, how to effectively avoid this loss during the turning over process has become an urgent problem to be solved in the turning over operation. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for improving the chip loss in the film turning operation. In the case of chip misalignment loss caused by turning the film after the original film laminating machine, an additional step of pressing the film with a homemade cloth hammer and pressing and peeling the film at the same time is added, which solves the chip misalignment loss problem caused by the original simple film laminating machine operation and effectively solves the problems existing in the production process.

[0005] Terminology explanation:

[0006] 1. Film turning: In chip operation, it refers to the operation of turning the chip from one film to another, with the front and back of the chip reversed.

[0007] 2. Misalignment: When the chip is flipped from one blue film to another, some chips remain on the original blue film, causing abnormal loss.

[0008] The technical solution of the present invention is as follows:

[0009] A method for improving chip film loss during film turning operation, comprising the following steps;

[0010] (1) Cutting the blue film for film turning: Cut the blue film for film turning according to the size of the chip after cutting and expanding the film;

[0011] (2) Select a suitable mask for film turning: The mask is a pre-prepared auxiliary tool for film turning that separates two blue films. There is a hole in the center of the mask, and the shape of the hole is consistent with the shape of the chip;

[0012] (3) Applying blue film to the chip: Place the chip to be flipped on the platform, and then apply the shielding plate and the blue film for flipping the film on the blue film where the chip to be flipped is located in sequence. At this time, the chip is embedded in the hole in the center of the shielding plate, and the chip is in contact with the blue film for flipping the film;

[0013] (4) placing the chip with the blue film applied in step (3) on a laminator, pressing the chip with the laminator for a certain period of time, and then removing the chip;

[0014] (5) Film turning: After the blue film cools down, turn the film from the diagonal position on one side of the chip. During the film turning process, press the film with a hammer while turning the film until the blue film is completely peeled off the chip. The film turning is completed.

[0015] (6) After the mold is turned over, the cloth hammer is used again to manually press the film at the chip misalignment point, which can serve as a double insurance for step (5) to prevent abnormalities.

[0016] In the prior art, during the film turning process, uneven force is often applied to the chip during the film pressing process or slight differences in the thickness of the blue film cause the chip to be misaligned. The present invention adds a cloth hammer to press the film. For the chip misalignment that occurs in step (5), a cloth hammer is used to manually press the film or to press the film while peeling off the film until the film turning is completed.

[0017] Preferably, in step (1), the size of the blue film used for film turning is 0.8-1 times the diameter of the blue film on which the chip to be turned is located, and the specific size can be determined according to the actual film turning situation.

[0018] Preferably, in step (2), the baffle is a pre-prepared auxiliary tool for film turning that separates two blue films. The baffle is sandwiched between the two blue films. The center of the baffle is empty to facilitate direct contact between the chip and the other blue film. The size of the hole in the center of the baffle is 1-1.2 times the diameter of the chip.

[0019] Preferably, in step (4), the time for pressing the chip by the laminator is between 40-90 seconds.

[0020] Preferably, in step (4), the parameters of the laminating machine are set as follows: the temperature is maintained at 45° C.-65° C., and the pressure is 0.4-0.6 MPa.

[0021] Preferably, in step (5), after the blue film is cooled, the film is flipped from the diagonal position on one side of the chip until the blue film is completely peeled off from the chip, that is, the blue film on which the chip was originally located is peeled off from one side, and the chip is turned over to another film;

[0022] The cloth hammer is made of dust-free cloth bound layer by layer.

[0023] Preferably, in step (6), for chip misalignment, the peeled blue film is supported with one hand and the blue film is squeezed hard with a cloth hammer with the other hand to increase the adsorption and adhesion between the new blue film and the chip, until the blue film is completely peeled off.

[0024] The beneficial effects of the present invention are:

[0025] The present invention is a method for improving chip loss during film turning operation. In the case of chip misalignment loss caused by turning over the film after the original film laminator has pressed the film, a step of pressing the film with a homemade cloth hammer and simultaneously peeling off the film is added, which effectively solves the chip misalignment loss caused by the original simple film laminator operation, effectively solves the problems existing in the production process, and effectively improves the actual output number. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0027] Figure 1 It is a schematic diagram of a laminating machine;

[0028] Figure 2 This is a schematic diagram of the film turning operation after film pressing in the present invention;

[0029] Figure 3 It is a schematic diagram of adding a cloth hammer operation to turn over the film in the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of the present invention are clearly and completely described, but not limited to this. Anything not fully described in the present invention shall be based on conventional techniques in the art.

[0031] Example 1

[0032] A method for improving chip film loss during film turning operation, comprising the following steps;

[0033] (1) Cutting the blue film for film turning: Cut the blue film for film turning according to the size of the chip after cutting and expanding the film. The size of the blue film for film turning is 0.8 times the diameter of the blue film on which the chip to be film turned is located;

[0034] (2) Select a suitable film turning mask: The mask is a pre-prepared auxiliary tool for separating two blue films. There is a hole in the center of the mask. The shape of the hole is consistent with the shape of the chip. The size of the hole in the center of the mask is 1 times the diameter of the chip.

[0035] (3) Applying blue film to the chip: Place the chip to be flipped on the platform, and then apply the shielding plate and the blue film for flipping the film on the blue film where the chip to be flipped is located in sequence. At this time, the chip is embedded in the hole in the center of the shielding plate, and the chip is in contact with the blue film for flipping the film;

[0036] (4) placing the chip with the blue film applied in step (3) on a laminator, pressing the chip with the laminator for 40-90 seconds, and removing the chip;

[0037] The parameters of the laminating machine were set as follows: the temperature was maintained at 45°C and the pressure was 0.6MPa;

[0038] (5) Film turning: After the blue film cools down, turn the film from the diagonal position on one side of the chip. During the film turning process, press the film with a hammer while turning the film until the blue film is completely peeled off the chip. The film turning is completed.

[0039] (6) After the mold is turned over, the cloth hammer is used again to manually press the film at the chip misalignment point, which can serve as a double insurance for step (5) to prevent abnormalities.

[0040] The cloth hammer is made of dust-free cloth bound layer by layer (purely homemade). For the place where the chip is misaligned, hold the peeled blue film with one hand and use the cloth hammer to squeeze the blue film hard with the other hand to increase the adsorption and adhesion between the new blue film and the chip until the blue film is completely peeled off.

[0041] Example 2

[0042] A method for improving the loss in chip film turning operation, as described in Example 1, the difference is that:

[0043] In step (1), cutting the blue film for film turning: cutting the blue film for film turning according to the size of the chip after cutting and expanding the film, the size of the blue film is 0.9 times the diameter of the blue film where the chip to be turned is located;

[0044] In step (2), a suitable film turning shield is selected: the middle shape of the shield is consistent with the shape of the chip, and the size of the hole is 1.1 times the diameter of the chip;

[0045] In step (4), the parameters of the laminating machine are set as follows: the temperature is maintained at 55° C. and the pressure is 0.5 MPa.

[0046] Example 3

[0047] A method for improving the loss in chip film turning operation, as described in Example 1, the difference is that:

[0048] In step (1), cutting the blue film for film turning: cutting the blue film for film turning according to the size of the chip after cutting and expanding the film, the size of the blue film is 0.9 times the diameter of the blue film where the chip to be turned is located;

[0049] In step (2), a suitable mask for film turning is selected: the middle shape of the mask is consistent with the shape of the chip, and the size of the hole is 1.2 times the diameter of the chip;

[0050] In step (4), the parameters of the laminating machine are set as follows: the temperature is maintained at 60° C. and the pressure is 0.45 MPa.

[0051] Comparative Example 1

[0052] The existing technology is adopted, namely, cutting the blue film for film turning - the mask for film turning - the chip is attached with the blue film - the film turning machine presses the film - the film turning process does not use the cloth hammer to press the film.

[0053] Comparing the methods in Example 1 and Comparative Example 1, the data obtained are shown in Table 1:

[0054] Table 1 Output data of the method of Example 1 and Comparative Example 1

[0055]

[0056]

[0057] From the comparison in Table 1, it can be seen that the output of the method in Example 1 is significantly higher than that of the original Comparative Example 1. The present invention significantly solves the chip misalignment loss in film turning and effectively increases the output number of a single chip.

[0058] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for improving the loss in chip film turning operation, characterized in that: The method comprises the following steps: (1) Cutting the blue film for film turning: Cut the blue film for film turning according to the size of the chip after cutting and expanding the film; (2) Select the mask for film turning: The mask is a pre-prepared auxiliary tool for film turning that separates two blue films. There is a hole in the center of the mask, and the shape of the hole is consistent with the shape of the chip; (3) Applying blue film to the chip: Place the chip to be flipped on the platform, and then apply the shielding plate and the blue film for flipping the film on the blue film where the chip to be flipped is located in sequence. At this time, the chip is embedded in the hole in the center of the shielding plate, and the chip is in contact with the blue film for flipping the film; (4) placing the chip with the blue film applied in step (3) on a laminator, pressing the chip with the laminator for a certain period of time, and then removing the chip; (5) Film turning: After the blue film cools down, turn the film from the diagonal position on one side of the chip. During the film turning process, press the film with a hammer while turning the film until the blue film is completely peeled off the chip. The film turning is completed. (6) After the mold is turned over, the cloth hammer is used again to manually press the film at the chip misalignment point.

2. The method for improving chip film loss during flipping operation according to claim 1, characterized in that: In step (1), the size of the blue film used for film flipping is 0.8-1 times the diameter of the blue film on which the chip to be flipped is located.

3. The method for improving chip film loss during film turning operation according to claim 1, characterized in that: In step (2), the size of the hole in the center of the shield is 1-1.2 times the diameter of the chip.

4. The method for improving chip film loss during film turning operation according to claim 1, characterized in that: In step (4), the chip is pressed by the laminating machine for a period of 40-90 seconds.

5. The method for improving chip film loss during flipping operation according to claim 4, characterized in that: In step (4), the parameters of the laminating machine are set as follows: the temperature is maintained at 45°C-65°C and the pressure is 0.4-0.6MPa.

6. The method for improving chip film loss during film turning operation according to claim 1, characterized in that: In step (5), the cloth hammer is bound layer by layer using dust-free cloth.

7. The method for improving chip film loss during flipping operation according to claim 1, characterized in that: In step (6), for chip misalignment, hold the peeled blue film with one hand and squeeze the blue film with a cloth hammer with the other hand to increase the adsorption and adhesion between the new blue film and the chip until the blue film is completely peeled off.

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