Method and device for improving warping of packaged product
By obtaining the vitrification and softening temperature of the packaged products, conducting systematic warpage improvement tests, and screening out the optimal parameters, solving the problem of warpage of electronic packaging products, achieving cost reduction and production cycle shortening.
Patent Information
- Application Number
- CN202411938813.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-04-15
AI Technical Summary
The prior art is difficult to effectively solve the problem of warping of electronic packaging products, resulting in increased assembly difficulty, high cost, and reduced product reliability and service life.
By obtaining the glass transition temperature and softening temperature of the packaged product, selecting several alternative temperatures, pressures and durations, performing systematic warpage improvement tests, and filtering out the optimal parameters to improve warpage.
It achieves efficient and accurate acquisition of optimal warpage improvement parameters, reduces costs, shortens production cycles, and improves the reliability and service life of packaging products.
Smart Images
Figure CN119833412A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of packaging technology, and in particular to a method and device for improving warpage of a packaging product. Background Art
[0002] Current electronic packaging products are generally made of a variety of materials, such as silicon chips, epoxy molding compounds (EMC), metal materials, polyimide and other materials. Due to the mismatch of the coefficient of thermal expansion (CTE) of these materials, the accumulation of mechanical stress during the packaging process, and the steps of heating, cooling, molding, and curing included in the packaging process, it is easy to cause the packaged product to warp, that is, the packaged product bends or deforms in the plane. Figure 1 A schematic diagram of a warped packaged product 50 is shown. Warping may make it difficult to accurately align the packaged product with the substrate or other components, increasing the difficulty and cost of assembly. It may also cause defects such as cracks and delamination in the packaged product, reducing the reliability and service life of the product. It may also affect the electrical connection and signal transmission in the packaged product, resulting in a decrease in product performance. Although the prior art reduces warping by selecting materials and optimizing processes, it is still difficult to completely avoid it in many cases.
[0003] At present, in order to improve the warpage problem of packaged products, one method is to press a stainless steel pressing block on the surface of the heated packaged product, apply a certain pressure to the product, remove the pressure after a certain period of time, and then manually measure the warpage value of the packaged product. The heating temperature, the weight of the stainless steel pressing block, and the pressing time must be estimated based on the material and experience, and then adjusted continuously according to the results of manual measurement. For example, the estimated temperature is 150 degrees Celsius, the stainless steel pressing block is 2 kilograms, and the pressing time is 4 hours. After completion, if the measurement finds that the packaged product cannot meet the warpage value requirements, the pressing time is increased, such as increased to 5 hours, and then measured again after completion, and so on... If the time is increased to the longest and still cannot meet the warpage value requirements, the weight of the stainless steel pressing block is increased, such as using a 4-kilogram stainless steel pressing block... Due to the existence of three parameters: heating temperature, weight of the stainless steel pressing block, and pressing time, in most cases, it takes many attempts to find a combination of warpage improvement process parameters that meet the warpage value requirements, which is time-consuming and labor-intensive, and there is a large uncertainty, and it is also difficult to find the optimal process parameter combination.
[0004] Application Contents
[0005] The purpose of this application is to provide a systematic method and device for screening parameters for warpage improvement of packaging products, which can efficiently and accurately obtain the optimal parameters, reduce costs, and shorten the production cycle.
[0006] The present application provides a method for improving the warpage of a packaged product, which is characterized by comprising: obtaining the glass transition temperature, softening temperature, minimum pressure, maximum pressure, minimum time and maximum time for stamping of the packaged product; selecting several alternative temperatures between the glass transition temperature and the softening temperature of the packaged product, selecting several alternative pressures between the minimum pressure and the maximum pressure, and selecting several alternative time periods between the minimum time period and the maximum time period, controlling several groups of packaged product samples to be constantly kept at one of the alternative temperatures, and using different combinations of the alternative pressures and the alternative time periods to perform a warpage improvement test on a single packaged product sample in each group of the packaged product samples. The specific test method is: applying the alternative pressure to the front side of any packaged product sample, canceling the alternative pressure after the alternative time period, measuring the warpage value of the packaged product sample, and if it is less than or equal to the warpage threshold, taking the group of alternative pressures, alternative time periods, and alternative temperatures as a group of alternative parameters; obtaining more than one group of alternative parameters after the warpage improvement test of each group of packaged product samples; selecting one group from the multiple groups of alternative parameters as the optimal parameters based on the production parameters, so that the packaged product is kept at a constant optimal temperature, applying a constant optimal pressure to the front side of the packaged product, canceling the optimal pressure after the optimal time period, and completing the improvement of the warpage of the packaged product.
[0007] In some embodiments, obtaining the glass transition temperature and softening temperature of the packaged product includes: adsorbing the back side of the packaged product sample on a platform, applying a constant initial pressure on the front side of the packaged product sample with a pressing block, and continuously measuring the distance between the platform and the pressing block while continuously heating the packaged product sample, and obtaining the glass transition temperature and softening temperature of the packaged product according to the change in the distance.
[0008] In some embodiments, the minimum pressure, the maximum pressure, the minimum duration, and the maximum duration are all preset.
[0009] In some embodiments, the selecting several alternative temperatures between the glass transition temperature and the softening temperature of the packaged product sample includes: selecting several temperatures as the alternative temperatures at fixed intervals between the glass transition temperature and the softening temperature of the packaged product sample.
[0010] In some embodiments, the selecting of several alternative temperatures between the glass transition temperature and the softening temperature of the packaged product sample includes: selecting several temperatures as the alternative temperatures at smaller intervals near the average temperature of the glass transition temperature and the softening temperature of the packaged product sample; selecting several temperatures as the alternative temperatures at larger intervals near the glass transition temperature and the softening temperature.
[0011] In some embodiments, the production parameters include: among the multiple groups of alternative parameters, selecting the group with the smallest alternative pressure as the optimal parameter; or among the multiple groups of alternative parameters, selecting the group with the shortest alternative time as the optimal parameter; or among the multiple groups of alternative parameters, selecting the group with the lowest alternative temperature as the optimal parameter.
[0012] In some embodiments, the production parameter is a function of the alternative temperature, the alternative pressure, and the alternative duration.
[0013] The present application also provides a device for improving the warpage of a packaged product, which is characterized by comprising: a platform, used to carry and adsorb the packaged product, and to heat the packaged product, and to keep the temperature of the packaged product constant; a pressing block, used to apply pressure to the packaged product; a rangefinder, used to measure the distance between the platform and the pressing block, and also used to measure the vertical distance between any point on the front of the packaged product and the platform; and a controller, used to control the platform to adsorb and heat the packaged product, and also used to control the size and duration of the pressure applied by the pressing block to the packaged product.
[0014] In some embodiments, the pressing block also has a heating and temperature control function, and can heat the pressing block itself and maintain it at a preset temperature.
[0015] In some embodiments, there are multiple pressing blocks, and the magnitude and duration of pressure applied by each pressing block to the packaged product are independent of each other.
[0016] The present application selects several alternative temperatures, alternative pressures, and alternative durations, and through different combinations of the three parameters, conducts warpage improvement tests on multiple packaging product samples to obtain one or more sets of alternative parameters that can meet the warpage threshold requirements, and screens the alternative parameters through production parameters to obtain a set of optimal parameters. The present application also provides a packaging product warpage improvement device that can be used in the method of the present application. The method and device of the present application can systematically screen the warpage improvement process parameters, efficiently and accurately obtain the optimal parameters, reduce costs, and shorten the production cycle. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 shows a schematic diagram of a warped packaged product 50;
[0018] Figure 2 A schematic diagram showing an embodiment of a method 100 for improving warpage of a packaged product of the present application;
[0019] Figure 3 A schematic diagram showing an embodiment of a device 1 for improving warpage of a packaged product of the present application;
[0020] Figure 4 A graph showing the height change of the packaged product 50 sample as the temperature rises in one embodiment of step S110;
[0021] Figure 5 A schematic diagram showing another embodiment of the device 1 for improving warpage of a packaged product of the present application;
[0022] Figure 6 Shows Figure 3 A schematic diagram of another embodiment of the intermediate pressure block 20 is shown. DETAILED DESCRIPTION
[0023] The present application is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but are not intended to limit the present application in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present application. These all belong to the protection scope of the present application.
[0024] Figure 2 A schematic diagram of an embodiment of a method 100 for improving warpage of a packaged product of the present application is shown.
[0025] Specifically, the method 100 includes the following steps:
[0026] S100, obtaining the glass transition temperature, softening temperature, minimum pressure, maximum pressure, minimum time and maximum time for stamping of the packaged product.
[0027] The glass transition temperature refers to the temperature at which a material changes from a glassy state to a highly elastic state. Below this temperature, the material is brittle and rigid, while above this temperature, the material is elastic and soft. The softening temperature refers to the temperature at which a material begins to soften and lose its strength under certain conditions. Therefore, the improvement of the warpage of the packaged product is generally carried out above the glass transition temperature and below the softening temperature.
[0028] In some embodiments, the glass transition temperature and softening temperature of the packaged product can be calculated or estimated based on the combination of materials, or obtained from the material or product provider. Even if the calculated or estimated glass transition temperature and softening temperature are not very accurate, they can be further optimized and adjusted according to the change of the warpage value during the subsequent warpage improvement test.
[0029] In other embodiments, the glass transition temperature and softening temperature of the packaged product can be obtained by the following steps: Figure 3 A schematic diagram showing an embodiment of a device 1 for improving warpage of a packaged product of the present application is shown:
[0030] S110, adsorb the back side of the packaged product 50 sample onto the platform 10, apply a constant initial pressure to the front side of the packaged product 50 sample with the pressing block 20, and while continuously heating the packaged product 50 sample, continuously measure the distance between the platform 10 and the pressing block 20, and obtain the glass transition temperature and softening temperature of the packaged product based on the change in distance.
[0031] The initial pressure is generally selected to be a relatively small pressure, such as 5N, which can not only allow the packaged product 50 sample to fully expand as the temperature rises, but also facilitate the determination of its softening state. Figure 3 Reference numeral 30 is a distance meter for continuously measuring the distance between the platform 10 and the pressing block 20 and taking it as the height of the packaged product 50 sample. Figure 4 A curve diagram of the height change of the packaged product 50 sample as the temperature rises in an embodiment of step 110 is shown. The initial height H0 of the packaged product 50 sample in the figure is 2.15 mm, the y-axis is the height difference between the current height H of the packaged product 50 sample and the initial height H0, and the x-axis is the temperature of the packaged product 50 sample. As can be seen from the figure, the curve basically presents three stages: when the temperature is low, the height difference of the packaged product 50 sample increases approximately linearly with the increase of temperature; until around 130 degrees Celsius, the growth of the height difference accelerates, and there is a rapid rising curve; at 210 degrees Celsius, the height difference reaches a peak value and then begins to fall back. The horizontal coordinate of the intersection of the tangents of the first stage and the second stage, 130 degrees Celsius, can be used as the glass transition temperature. In some embodiments, a temperature can be selected as the glass transition temperature in the transition interval between the first stage and the second stage, and it can be further optimized and adjusted according to the change of the warpage value during the subsequent warpage improvement test. In other embodiments, considering the subsequent warpage improvement effect and efficiency, the higher temperature in the transition interval can also be used as the glass transition temperature. The temperature at which the height difference reaches its peak value can be taken as the softening temperature.
[0032] In some embodiments, the minimum pressure, maximum pressure, minimum duration, and maximum duration for stamping can be preset according to the actual requirements of the packaged product. If the pressure is too low, the warpage improvement effect may be poor or a longer duration may be required; if the pressure is too high, the packaged product may be easily damaged. If the duration is too low, the warpage improvement effect may also be poor; if the duration is too long, production efficiency may be affected.
[0033] S200. Select several alternative temperatures between the glass transition temperature and the softening temperature of the packaged product, select several alternative pressures between the minimum pressure and the maximum pressure, select several alternative time periods between the minimum time period and the maximum time period, and control several groups of packaged product samples constantly at an alternative temperature. Use different combinations of alternative pressures and alternative time periods to perform a warpage improvement test on a single packaged product sample in each group of packaged product samples. The specific test method is: apply an alternative pressure to the front of any packaged product sample, remove the alternative pressure after the alternative time period, measure the warpage value of the packaged product sample, and if it is less than or equal to the warpage threshold value, use the group of alternative pressures, alternative time periods, and alternative temperatures as a group of alternative parameters.
[0034] In some embodiments, several alternative temperatures are selected between the glass transition temperature and the softening temperature of the packaged product by the following steps:
[0035] S211. Select several temperatures as candidate temperatures at fixed intervals between the glass transition temperature and the softening temperature of the packaged product sample.
[0036] For example, in an embodiment where the glass transition temperature is 130 degrees Celsius and the softening temperature is 210 degrees Celsius, alternative temperatures can be selected at a fixed interval of 5 degrees Celsius: 135, 140...200, 205 degrees Celsius, or at a fixed interval of 10 degrees Celsius: 140, 150...190, 200 degrees Celsius. The smaller the interval, the more accurate the subsequent warpage improvement test; the larger the interval, the fewer packaged product samples are required, the fewer tests are conducted, and this is conducive to improving efficiency and reducing costs.
[0037] Since the alternative temperature near the softening temperature has the risk of damaging the packaged product, and the alternative temperature near the glass transition temperature is low, the efficiency of warpage improvement may be poor. Considering the cost, efficiency and accuracy, in some embodiments, several alternative temperatures can be selected between the glass transition temperature and the softening temperature of the packaged product through the following steps:
[0038] S212. Select several temperatures as the candidate temperatures at smaller intervals near the average temperature of the glass transition temperature and the softening temperature of the packaged product sample; select several temperatures as the candidate temperatures at larger intervals near the glass transition temperature and the softening temperature.
[0039] For example, in an embodiment with a glass transition temperature of 130 degrees Celsius and a softening temperature of 210 degrees Celsius, alternative temperatures can be selected at intervals of 5 degrees Celsius near the average temperature of 170 degrees Celsius between 130 degrees Celsius and 210 degrees Celsius, and alternative temperatures can be selected at intervals of 15 degrees Celsius near 130 degrees Celsius and 210 degrees Celsius. The final selected alternative temperatures are: 145, 160, 165, 170, 175, 180, 195 degrees Celsius.
[0040] In other embodiments, certain alternative temperatures may be excluded according to special requirements of the packaged product. For example, in order to avoid the risk of damage to the packaged product, alternative temperatures higher than 180 degrees are excluded and the following options are selected: 145, 160, 165, 170, and 175 degrees Celsius.
[0041] In some embodiments, a number of alternative pressures are selected at fixed intervals between the preset minimum pressure and the maximum pressure, and a number of alternative durations are selected at fixed intervals between the preset minimum duration and the maximum duration. For example, between the minimum pressure of 20N and the maximum pressure of 60N, the following are selected: 20, 30, 40, 50, 60N; between the minimum duration of 1h and the maximum duration of 5h, the following are selected: 1, 2, 3, 4, 5h. In other embodiments, alternative pressures and alternative durations may also be selected at different intervals as needed.
[0042] In this way, it is necessary to provide 5 groups of packaged product samples, which are constantly controlled at 5 alternative temperatures (145, 160, 165, 170, and 175 degrees Celsius). Each group of packaged product samples includes 25 samples, and different combinations of alternative pressures and alternative time lengths (i.e., 25 combinations of 20, 30, 40, 50, 60N and 1, 2, 3, 4, and 5h) are used to conduct a warpage improvement test on each packaged product sample in each group of packaged product samples. Figure 5 A schematic diagram of another embodiment of the device 1 for improving the warpage of a packaged product of the present application is shown. The figure schematically indicates a plurality of pressing blocks 20 and a plurality of samples of packaged products 50 on the platform 10 corresponding thereto. Each pressing block 20 applies an alternative pressure on the front of the sample of the packaged product 50 according to different combinations of alternative pressures and alternative durations. For example, the pressing block 20 on the lower left of the figure can apply an alternative pressure of 10N on the front of the corresponding sample of the packaged product 50, which is then removed after 1 hour, and then the warpage value of the sample of the packaged product 50 is measured. In this way, a group of samples of packaged products 50 at the same alternative temperature can be tested for warpage improvement at the same time, which greatly improves efficiency and saves cost and time. In other embodiments, through zone temperature control, samples of packaged products 50 at different alternative temperatures can also be tested for warpage improvement at the same time on the same device 1 for improving the warpage of a packaged product.
[0043] In some embodiments, the vertical distance between the center point of the front of the packaged product 50 sample and the platform 10 is measured by a distance meter or other equipment as the origin height, and the vertical distance between several points around the front of the packaged product 50 sample and the platform 10 is measured as the reference height. For example, one point can be selected at each of the four corners and four sides of the front of the packaged product 50 sample, and a total of eight points can be measured to obtain eight reference heights. The point with the largest difference from the origin height is selected, and the difference is used as the warpage value of the packaged product 50 sample. If the warpage value is less than the warpage threshold, such as 0.2 mm, the set of alternative pressures, alternative durations, and alternative temperatures is used as a set of alternative parameters.
[0044] S300, after the warpage improvement test of each group of packaged product samples, more than one group of candidate parameters are obtained.
[0045] For example, after the warpage improvement tests of five groups of packaged product samples at the above five alternative temperatures, five alternative pressures, and five alternative durations, the following 14 groups of alternative parameters were obtained:
[0046] Serial number Alternative temperature (℃) Alternative pressure (N) Alternative duration (h) 1 175 60 2 2 175 50 3 3 175 40 4 4 175 30 5 5 170 60 3 6 170 50 4 7 170 40 4 8 170 30 5 9 165 60 3 10 165 50 4 11 165 40 5 12 160 60 4 13 160 50 5 14 145 60 5
[0047] Table 1
[0048] In some embodiments, during the warpage improvement test of each group of packaged product samples, each parameter can be further optimized. For example, when the warpage improvement test of the packaged product sample group with the highest temperature of 175 degrees Celsius is first performed, it can be seen that:
[0049] When the alternative temperature is the maximum temperature of 175 degrees Celsius and the alternative time is the maximum time of 5h, the alternative pressure cannot meet the warping threshold requirement after being lower than 30N; then at a lower alternative temperature and / or a shorter alternative time, the alternative pressure lower than 30N is obviously even more unable to meet the warping value requirement, so other warping improvement tests with an alternative pressure of 20N may not be carried out subsequently.
[0050] When the alternative temperature is the maximum temperature of 175 degrees Celsius and the alternative pressure is the maximum pressure of 60N, the alternative time cannot meet the warping threshold requirement after being less than 2h; then at a lower alternative temperature and / or a smaller alternative pressure, the alternative time of less than 2h is obviously even more unable to meet the warping value requirement, so other warping improvement tests with an alternative time of 1h may not be carried out subsequently.
[0051] Then, if we continue to test the warpage improvement of the packaged product sample group at an alternative temperature of 170 degrees Celsius, we can see that:
[0052] When the alternative temperature is 170 degrees Celsius and the alternative pressure is the maximum pressure of 60N, the alternative time cannot meet the warping threshold requirement after being less than 3h; then at a lower alternative temperature and / or a smaller alternative pressure, the alternative time of less than 3h is obviously even more unable to meet the warping value requirement, so other warping improvement tests with an alternative time of 2h may not be carried out subsequently.
[0053] By analogy, the number of warpage improvement tests can be dynamically reduced based on the test results to reduce cost and time.
[0054] However, in some other embodiments, the warpage improvement test of each group of packaged product samples may be performed simultaneously, for example, using multiple Figure 5 The device 1 for improving the warpage of the packaged product can simultaneously perform improvement tests, which can greatly shorten the test time.
[0055] S400, according to the production parameters, select one group from the multiple groups of alternative parameters as the optimal parameter, so that the packaged product is constantly at the optimal temperature, apply a constant optimal pressure to the front of the packaged product, and remove the optimal pressure after the optimal period of time, thereby completing the improvement of the warpage of the packaged product.
[0056] Production parameters are used to further screen multiple groups of candidate parameters based on actual production needs.
[0057] In some embodiments, production parameters include:
[0058] Among multiple groups of alternative parameters, the group with the smallest alternative pressure is selected as the optimal parameter. For example, the minimum alternative pressure in Table 1 is 30N. Correspondingly, the fifth group of alternative parameters (175, 30, 5) and the eighth group of alternative parameters (170, 30, 5) can be screened out. In some embodiments, when the alternative pressure and the alternative duration are the same, a lower alternative temperature can be selected to save temperature control costs and reduce the risk of packaged product breakage. For example, the eighth group of alternative parameters (170, 30, 5) is selected as the optimal parameter among the fifth and eighth groups of alternative parameters.
[0059] Alternatively, among multiple groups of candidate parameters, the group with the shortest candidate duration is selected as the optimal parameter. For example, the shortest candidate duration in Table 1 is 2 hours. Correspondingly, the first group of candidate parameters (175, 60, 2) can be selected as the optimal parameter.
[0060] Alternatively, among multiple groups of candidate parameters, the group with the lowest candidate temperature is selected as the optimal parameter. For example, the lowest candidate temperature in Table 1 is 145 degrees Celsius. Correspondingly, the 14th group of candidate parameters (145, 60, 5) can be selected as the optimal parameter.
[0061] In other embodiments, the production parameters are functions of alternative temperatures, alternative pressures, and alternative durations, such as:
[0062] P(t, f, l)=At+Bf+Cl; (t, f, l) when P is the minimum value is taken as the optimal parameter.
[0063] Where P is the production parameter, t is the alternative temperature, f is the alternative pressure, l is the alternative duration, A, B, and C are the weight coefficients of the alternative temperature, alternative pressure, and alternative duration, respectively, which can be set according to actual needs.
[0064] For example: set A = 1, B = 3.8, C = 40, then according to the production parameter function P(t, f, l) = t + 3.8f + 40l;
[0065] The 14 groups of candidate parameters in Table 1 and the corresponding production parameters are as follows:
[0066]
[0067] Table 2
[0068] Therefore, the 7th group of candidate parameters (170, 40, 4) with the minimum production parameter of 482 can be selected as the optimal parameters.
[0069] After determining the optimal parameters, the warpage of the packaged product can be improved in batches. For example, in the above embodiment, the packaged product is kept at an optimal temperature of 170 degrees Celsius, and a constant optimal pressure of 40N is applied to the front of the packaged product for an optimal duration of 4 hours before being removed, thereby completing the improvement of the warpage of the packaged product.
[0070] The present application also provides a device for improving the warpage of a packaged product, see Figure 3 A schematic diagram of an embodiment of a device 1 for improving warpage of a packaged product of the present application, comprising:
[0071] The platform 10 is used to carry and adsorb the packaged product 50, heat the packaged product 50, and keep the temperature of the packaged product 50 constant. In some embodiments, the platform 10 also includes an air extraction channel, an air extraction pump, and components for heating and temperature control (not shown in the figure) for adsorbing the packaged product 50. In some embodiments, the platform 10 can also perform zone heating and zone temperature control so as to heat and control the temperature of a single or part of the packaged products carried thereon.
[0072] The pressing block 20 is used to apply pressure to the packaged product 50. In some embodiments, the pressing block 20 is connected to the guide rail 60 through a retractable bracket, and can be moved along the guide rail 60 by a motor, so that pressure can be applied to the packaged products 50 at different positions carried on the platform 10. In some embodiments, the pressing block 20 also has a heating and temperature control function, and can heat the pressing block 20 itself and maintain it at a preset temperature. For example, the pressing block 20 can heat itself to the same temperature as the packaged product 50 to be pressed and maintain a constant temperature, and then apply pressure to the packaged product 50 to avoid affecting the warpage improvement effect due to the temperature difference between the pressing block 20 and the packaged product 50. In other embodiments, the temperature difference between the pressing block 20 and the packaged product 50 can also be used to adjust and control its temperature.
[0073] In some embodiments, see Figure 5 There are multiple pressing blocks 20, and the pressure size and duration applied by each pressing block 20 to the packaged product 50 are independent of each other. Pressure can be applied to each packaged product 20 sample according to different alternative pressure and alternative duration combinations, which is convenient for batch warpage improvement testing of packaged product 50 samples.
[0074] The distance meter 30 is used to measure the distance between the platform 10 and the pressing block 20, and also to measure the vertical distance between any point on the front of the packaged product 50 and the platform 10. The distance meter 30 can be a laser distance meter, an infrared distance meter, or other instruments that can meet the measurement accuracy requirements, and can be used to obtain the glass transition temperature and softening temperature of the packaged product 50, and can also be used to measure the warpage value of the packaged product 50. Figure 3 The rangefinder in the embodiment is arranged on the side wall above the platform 10. In some embodiments, the rangefinder may also be arranged on the platform 10.
[0075] In other embodiments, the rangefinder 30 may also be disposed on the pressing block 20 . Figure 6 Shows Figure 3 A schematic diagram of another embodiment of the medium pressing block 20. In the figure, the pressing block 20 is not a separate pressing block, but is composed of a pressing block body 21 and a pressing block box 22. The pressing block body 21 can extend from the pressing block box 22 to apply pressure to the packaged product 50, and a distance meter 30 is also provided in the pressing block box 22.
[0076] The controller 40 is used to control the platform 10 to adsorb and heat the packaged product 50, and is also used to control the size and duration of the pressure applied by the pressing block 20 to the packaged product 50. In some embodiments, the controller 40 also has an input module and an input module, such as a button, a knob, a voice input module, a display screen, a touch screen and / or a speaker, which can be used to set parameters such as temperature, pressure, duration, production, etc., and to observe the curve graph of the height change of the packaged product 50 as the temperature rises, the warpage value of the packaged product 50, etc. In some embodiments, the controller 40 can also be used to calculate the glass transition temperature and the softening temperature, to screen the candidate parameters, and to obtain the optimal parameters according to the production parameters.
[0077] A person skilled in the art may understand and implement other changes to the disclosed embodiments by reading the specification, the disclosed contents, the drawings and the appended claims. In the claims, the wording "comprising" does not exclude other elements and steps, and the wording "a" or "an" does not exclude the plurality. In the practical application of this application, a part may perform the functions of multiple technical features cited in the claims. Any reference numerals in the claims should not be construed as limiting the scope.
Claims
1. A method for improving the warpage of a packaged product, characterized in that: include: Obtaining the glass transition temperature, softening temperature, minimum pressure, maximum pressure, minimum time and maximum time for stamping of the packaged product; Select several alternative temperatures between the glass transition temperature and the softening temperature of the packaged product, select several alternative pressures between the minimum pressure and the maximum pressure, select several alternative time periods between the minimum time period and the maximum time period, and control several groups of packaged product samples to be constantly controlled at one of the alternative temperatures. Use different combinations of the alternative pressures and the alternative time periods to perform a warpage improvement test on a single packaged product sample in each group of packaged product samples. The specific test method is: apply the alternative pressure to the front of any packaged product sample, remove the alternative pressure after the alternative time period, measure the warpage value of the packaged product sample, and if it is less than or equal to the warpage threshold, use the group of alternative pressures, alternative time periods, and alternative temperatures as a group of alternative parameters; After the warpage improvement test of each group of packaged product samples, more than one group of candidate parameters are obtained; According to the production parameters, one group is selected from the multiple groups of alternative parameters as the optimal parameters, so that the packaged product is kept at an optimal temperature, a constant optimal pressure is applied to the front of the packaged product, and the optimal pressure is removed after the optimal pressure is maintained for an optimal period of time, thereby improving the warping of the packaged product.
2. The improvement method according to claim 1, characterized in that: The step of obtaining the glass transition temperature and softening temperature of the packaged product includes: The back of the packaged product sample is adsorbed on the platform, and a constant initial pressure is applied to the front of the packaged product sample with a pressing block. While the packaged product sample is continuously heated, the distance between the platform and the pressing block is continuously measured, and the glass transition temperature and softening temperature of the packaged product are obtained based on the change in the distance.
3. The improvement method according to claim 1, characterized in that: The minimum pressure, the maximum pressure, the minimum duration, and the maximum duration are all preset.
4. The improvement method according to claim 1, characterized in that: The method of selecting a plurality of alternative temperatures between the glass transition temperature and the softening temperature of the packaged product sample comprises: Between the glass transition temperature and the softening temperature of the packaged product sample, several temperatures are selected as the candidate temperatures at fixed intervals.
5. The improvement method according to claim 1, characterized in that: The method of selecting a plurality of alternative temperatures between the glass transition temperature and the softening temperature of the packaged product sample comprises: Near the average temperature of the glass transition temperature and the softening temperature of the packaged product sample, several temperatures are selected as the alternative temperatures at smaller intervals; near the glass transition temperature and the softening temperature, several temperatures are selected as the alternative temperatures at larger intervals.
6. The improvement method according to claim 1, characterized in that: The production parameters include: Among the multiple groups of candidate parameters, the group with the smallest candidate pressure is selected as the optimal parameter; or Among the multiple groups of candidate parameters, the group with the shortest candidate duration is selected as the optimal parameter; or Among the multiple groups of candidate parameters, the group with the lowest candidate temperature is selected as the optimal parameter.
7. The improvement method according to claim 1, characterized in that: The production parameter is a function of the alternative temperature, the alternative pressure, and the alternative time period.
8. A device for improving the warpage of a packaged product, characterized in that: include: A platform, used for carrying and adsorbing the packaged product, heating the packaged product, and maintaining a constant temperature of the packaged product; A pressing block, used to apply pressure to the packaged product; A distance meter, used to measure the distance between the platform and the pressing block, and also used to measure the vertical distance between any point on the front of the packaged product and the platform; as well as The controller is used to control the platform to adsorb and heat the packaged product, and is also used to control the size and duration of the pressure applied by the pressing block to the packaged product.
9. The improvement device according to claim 8, characterized in that The pressing block also has heating and temperature control functions, and can heat the pressing block itself and maintain it at a preset temperature.
10. The improvement device according to claim 8, characterized in that There are multiple pressing blocks, and the magnitude and duration of pressure applied by each pressing block to the packaged product are independent of each other.