{"id":47278,"date":"2022-12-09T01:43:24","date_gmt":"2022-12-09T01:43:24","guid":{"rendered":"https:\/\/silmantech.com\/?p=47278"},"modified":"2024-04-13T02:09:30","modified_gmt":"2024-04-13T02:09:30","slug":"if-the-fpc-curved-radius-is-unreasonable-this-will-cause-breaks","status":"publish","type":"post","link":"https:\/\/silmantech.com\/pt\/if-the-fpc-curved-radius-is-unreasonable-this-will-cause-breaks\/","title":{"rendered":"Porque \u00e9 que o raio curvo ideal do FPC \u00e9 importante na eletr\u00f3nica"},"content":{"rendered":"
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When the FPC is bent, the types of stress on both sides of the heart line are different. The inner side of the curved surface is pressure and the outer side is tension. The size of the stress is related to the thickness of the FPC and the bending radius. Excessive stress will lead to FPC layers and copper foil breaks. Therefore, the layer pressure structure of the FPC should be arranged reasonably during design to make the layer pressure at both ends of the central line of the curved curved surface as symmetrical. Calculate the curved radius based on different applications.
\nCalculation of bending radius required
\nConditions 1. The curvature of the unilateral flexible line board is shown in the figure below:
\nIts curved radius can be calculated according to the following formulas:
\nR = (c\/2) [(100-eb)\/eb] -D
\nThese:
\nR = bending radius (unit \u03bcM)
\nC = copper skin thickness (unit \u03bcM)
\nD = Cover thickness (unit \u03bcM)
\nEB = copper skin allows deformation (calculated at a percentage rate)
\nThe types of copper and the deformation of copper skin are different.
\nA. The deformation of copper pressing copper plate is \u226416%
\nThe deformation of the copper skin during copper electrolysis is \u226411%.
\nIn addition, the deformation of the same material copper skin on different use occasions is also different. For a bending occasion, the limit of the critical state of the break is used (the value of the delay copper, the value is 16%). In the bending installation design, the deformation values (10%, pair of copper) specified by IPC-MF-150 are used. For dynamic applications, the deformation of copper skin is 0.3%. In magnetic head applications, the deformation of copper skin is 0.1%.
\nAt the same time, the radius of the curved plate is set by setting the deformation allowed by the copper plate.
\nMoving: The scenarios of this type of copper skin can be achieved through deformation. For example, the phosphorus and copper shifts in the IC card seat, that is, the part of contact with the chip after the IC card is inserted. This application scenario is flexible.
\nExample: 50 \u03bcM polytamide, 25 \u03bcm glue, so D = 75 \u03bcm, C = 35 \u03bcM Flexible plate total thickness T = 185 \u03bcm
\nBending at a time, 16%= 16.9\u03bcm, R\/T = 0.09
\nWith 10% R = 80 \u03bcm or R\/T = 0.45 Bend installation
\nDynamic bent, 0.3% R = 5.74 mm, R\/T = 31
\nIn the scene shown above, the connector is needed to be inserted, and the “dynamic bend” is required. The curved radius is controlled to the> 6 mm, and the diameter> 12 mm.
\nGreat algorithm: about 50 times the total thickness.
\n2. Double panel
\nThese:
\nR = bending radius, unit \u03bcM
\nC = copper skin thickness, unit \u03bcM
\nD = coating thickness, unit \u03bcM
\nEB = copper skin deformation, calculate at a percentage rate.
\nThe EB value is the same as the above value.
\nD = The thickness of the medium of each layer \u03bcM
\nfor example:
\nLower substrate thickness: 50 \u03bcM polytamide;
\n2X25 \u03bcM glue;
\n2X35 \u03bcM copper, d = 100 \u03bcm; C = 35\u03bcm
\nCoating thickness: 25 \u03bcM polytamide film; 50 \u03bcm glue layer d = 75\u03bcm
\nTotal thickness: t = 2 d+2+2 c = 320\u03bcm
\nAccording to the equation:
\nBending at one time, EB = 16% R = 0.371\u03bcm, R\/T = 1.16
\nEB = 10% R = 0.690 mm Bend installation,
\nR\/T = 2.15 dynamic bending, EB = 0.3% R = 28.17 mm, R\/T = 88<\/div><\/div><\/div><\/div><\/div><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Quando o FPC \u00e9 dobrado, os tipos de estresse em ambos os lados da linha do cora\u00e7\u00e3o s\u00e3o diferentes. O lado interno da superf\u00edcie curva \u00e9 a press\u00e3o e o lado externo \u00e9 a tens\u00e3o. O tamanho da tens\u00e3o est\u00e1 relacionado \u00e0 espessura do FPC e ao raio de curvatura. O estresse excessivo levar\u00e1 a\u2026<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_stopmodifiedupdate":false,"_modified_date":"","footnotes":""},"categories":[87,1],"tags":[],"class_list":["post-47278","post","type-post","status-publish","format-standard","hentry","category-bonding-machine","category-news","category-87","category-1","description-off"],"_links":{"self":[{"href":"https:\/\/silmantech.com\/pt\/wp-json\/wp\/v2\/posts\/47278","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/silmantech.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/silmantech.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/silmantech.com\/pt\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/silmantech.com\/pt\/wp-json\/wp\/v2\/comments?post=47278"}],"version-history":[{"count":0,"href":"https:\/\/silmantech.com\/pt\/wp-json\/wp\/v2\/posts\/47278\/revisions"}],"wp:attachment":[{"href":"https:\/\/silmantech.com\/pt\/wp-json\/wp\/v2\/media?parent=47278"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/silmantech.com\/pt\/wp-json\/wp\/v2\/categories?post=47278"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/silmantech.com\/pt\/wp-json\/wp\/v2\/tags?post=47278"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}