{"id":38079,"date":"2021-12-23T15:54:44","date_gmt":"2021-12-23T15:54:44","guid":{"rendered":"https:\/\/www.pei.it\/cz-roletove-kryty-standard\/soffietti-di-protezione-piani-cuciti\/"},"modified":"2025-12-10T10:06:46","modified_gmt":"2025-12-10T10:06:46","slug":"flat-stitched-bellows","status":"publish","type":"post","link":"https:\/\/www.pei.it\/en\/products\/flat-stitched-bellows\/","title":{"rendered":"Sewn flat covers"},"content":{"rendered":"<div class=\"wpb-content-wrapper\">[vc_row][vc_column][vc_row_inner element_id=&#8221;595341&#8243;][vc_column_inner width=&#8221;3\/5&#8243;]<div class=\"avt_masterslider_el \" >\n\t\t<!-- MasterSlider -->\n\t\t<div id=\"P_MS697b146556174\" class=\"master-slider-parent ms-thumbs-template ms-parent-id-36\" style=\"max-width:820px;\" >\n\n\t\t\t\n\t\t\t<!-- MasterSlider Main -->\n\t\t\t<div id=\"MS697b146556174\" class=\"master-slider ms-skin-black-2 round-skin\" >\n\t\t\t\t \t\t\t\t \n\t\t\t<div  class=\"ms-slide\" data-delay=\"3\" data-fill-mode=\"fit\"   >\n\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.pei.it\/wp-content\/plugins\/masterslider\/public\/assets\/css\/blank.gif\" alt=\"Soffietti Piani Cuciti\" title=\"soffietti-cuciti\" data-src=\"https:\/\/www.pei.it\/wp-content\/uploads\/2021\/11\/soffietti-cuciti.jpg\" \/>\n\n\n\t<img loading=\"lazy\" decoding=\"async\" class=\"ms-thumb\" src=\"https:\/\/www.pei.it\/wp-content\/uploads\/2021\/11\/soffietti-cuciti-130x80.jpg\" alt=\"Soffietti Piani Cuciti\" \/>\n\t\t\t\t<\/div>\n\t\t\t<div  class=\"ms-slide\" data-delay=\"3\" data-fill-mode=\"fit\"   >\n\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.pei.it\/wp-content\/plugins\/masterslider\/public\/assets\/css\/blank.gif\" alt=\"\" title=\"soffietti_piani_cuciti_2\" data-src=\"https:\/\/www.pei.it\/wp-content\/uploads\/2021\/11\/soffietti_piani_cuciti_2.jpg\" \/>\n\n\n\t<img loading=\"lazy\" decoding=\"async\" class=\"ms-thumb\" src=\"https:\/\/www.pei.it\/wp-content\/uploads\/2021\/11\/soffietti_piani_cuciti_2-130x80.jpg\" alt=\"\" \/>\n\t\t\t\t<\/div>\n\n\t\t\t<\/div>\n\t\t\t<!-- END MasterSlider Main -->\n\n\t\t\t \n\t\t<\/div>\n\t\t<!-- END MasterSlider -->\n\n\t\t<script>\n\t\t( window.MSReady = window.MSReady || [] ).push( function( $ ) {\n\n\t\t\t\"use strict\";\n\t\t\tvar masterslider_6174 = new MasterSlider();\n\n\t\t\t\/\/ slider controls\n\t\t\tmasterslider_6174.control('arrows'     ,{ autohide:true, overVideo:true  });\n\t\t\tmasterslider_6174.control('thumblist'  ,{ autohide:false, overVideo:true, dir:'h', speed:17, inset:false, arrows:false, hover:false, customClass:'', align:'bottom',type:'thumbs', margin:5, width:130, height:80, space:7, fillMode:'fill'  });\n\t\t\t\/\/ slider setup\n\t\t\tmasterslider_6174.setup(\"MS697b146556174\", {\n\t\t\t\twidth           : 850,\n\t\t\t\theight          : 850,\n\t\t\t\tminHeight       : 0,\n\t\t\t\tspace           : 0,\n\t\t\t\tstart           : 1,\n\t\t\t\tgrabCursor      : true,\n\t\t\t\tswipe           : true,\n\t\t\t\tmouse           : true,\n\t\t\t\tkeyboard        : false,\n\t\t\t\tlayout          : \"boxed\",\n\t\t\t\twheel           : false,\n\t\t\t\tautoplay        : false,\n                instantStartLayers:false,\n\t\t\t\tmobileBGVideo:false,\n\t\t\t\tloop            : false,\n\t\t\t\tshuffle         : false,\n\t\t\t\tpreload         : 2,\n\t\t\t\theightLimit     : true,\n\t\t\t\tautoHeight      : false,\n\t\t\t\tsmoothHeight    : true,\n\t\t\t\tendPause        : false,\n\t\t\t\toverPause       : true,\n\t\t\t\tfillMode        : \"fill\",\n\t\t\t\tcenterControls  : true,\n\t\t\t\tstartOnAppear   : false,\n\t\t\t\tlayersMode      : \"center\",\n\t\t\t\tautofillTarget  : \"\",\n\t\t\t\thideLayers      : false,\n\t\t\t\tfullscreenMargin: 0,\n\t\t\t\tspeed           : 20,\n\t\t\t\tdir             : \"h\",\n\t\t\t\tresponsive      : true,\n\t\t\t\ttabletWidth     : 768,\n\t\t\t\ttabletHeight    : null,\n\t\t\t\tphoneWidth      : 480,\n\t\t\t\tphoneHeight    : null,\n\t\t\t\tsizingReference : window,\n\t\t\t\tparallaxMode    : 'swipe',\n\t\t\t\tview            : \"fade\"\n\t\t\t});\n\n\t\t\t\n\t\t\twindow.masterslider_instances = window.masterslider_instances || [];\n\t\t\twindow.masterslider_instances.push( masterslider_6174 );\n\t\t});\n\t\t<\/script>\n\n<\/div>[vc_empty_space height=&#8221;50px&#8221;][\/vc_column_inner][vc_column_inner width=&#8221;2\/5&#8243;][vc_empty_space height=&#8221;20px&#8221;][vc_btn title=&#8221;Contact us for this product&#8221; style=&#8221;outline-custom&#8221; outline_custom_color=&#8221;#1e73be&#8221; outline_custom_hover_background=&#8221;#e34529&#8243; outline_custom_hover_text=&#8221;#ffffff&#8221; shape=&#8221;round&#8221; link=&#8221;url:%23form|title:TMP1-Coperture%20Telescopiche|&#8221; el_class=&#8221;bottone_template&#8221;]<h4 class=\"et-heading text-align-left tablet-text-align-inherit mobile-text-align-inherit animate-false no-animation-type testo_template\" id=\"et-heading-265042\" data-delay=\"0\" data-mobile-font=\"inherit\" data-mobile-line-height=\"inherit\" data-tablet-landscape-font=\"inherit\" data-tablet-portrait-font=\"inherit\" data-tablet-landscape-line-height=\"inherit\" data-tablet-portrait-line-height=\"inherit\" data-parallax=\"false\" data-move=\"false\" data-coordinatex=\"0\" data-coordinatey=\"0\" data-speed=\"10\"><span class=\"text-wrapper\"><span class=\"text\">PEI sewn flat bellows: strong and durable<\/span><\/span><\/h4>[vc_column_text animation_delay=&#8221;0&#8243; el_class=&#8221;testo_template&#8221;]<strong>P.E.I.<\/strong> sewn bellows are very robust and have a very compact closed length in relation to the stroke of the bellows.<br \/>\nThese bellows are manufactured with a double seam on the folds.<br \/>\nSince there is no pleat, the accumulation of chips and emulsions on the bellows is avoided.<br \/>\nIf the application requires special structural rigidity, profiled metal intermediate elements can be provided for a secure support on the guideway.<\/p>\n<p><strong>Bellows data:<\/strong><\/p>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;B = Bellows width&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:6913,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">B = Bellows width<\/span><\/p>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;a = Bellows height&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:6913,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">a = Bellows height<\/span><\/p>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;d = Bellows return&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:6913,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">d = Bellows return<\/span><\/p>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;x = Fold height&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:6913,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">x = Fold height<\/span><\/p>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;AP= Fold opening&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:6913,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">AP = Fold opening<\/span><\/p>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;For this type of bellows, consult our technical department.&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:277249,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:353217},&quot;15&quot;:&quot;Calibri, sans-serif&quot;,&quot;16&quot;:11,&quot;21&quot;:1}\" data-sheets-hyperlink=\"https:\/\/www.pei.it\/it\/contatti\/\">For this type of bellows, consult our <a class=\"in-cell-link\" href=\"https:\/\/www.pei.it\/en\/contact-us\/\" target=\"_blank\" rel=\"noopener\">technical department<\/a>.<\/span>[\/vc_column_text][vc_empty_space height=&#8221;50px&#8221;][\/vc_column_inner][\/vc_row_inner][vc_separator color=&#8221;sky&#8221;][\/vc_column][\/vc_row][vc_row element_id=&#8221;840365&#8243; css=&#8221;.vc_custom_1635159784796{padding-top: 50px !important;}&#8221;][vc_column animation_delay=&#8221;0&#8243; element_id=&#8221;165733&#8243; crp=&#8221;480:i:i,480-768:i:i,768-1024:i:i,1024-1280:i:i,1280-1366:i:i,1366-1600:i:i,1600-1920:i:i&#8221; el_class=&#8221;colonna_tab_template&#8221;]<div class=\"et-tab-wrapper\"><div id=\"et-tab-1\" class=\"et-tab et-clearfix center-false horizontal\"><div data-target=\"tab-formulae\" class=\"active tab et-clearfix\"><h6 class=\"tab-title-tag\">Formulae<\/h6><\/div> <div id=\"tab-formulae-1\" class=\"tab-content et-clearfix\">[vc_row_inner element_id=&#8221;839507&#8243;][vc_column_inner width=&#8221;1\/2&#8243;]<h4 class=\"et-heading text-align-left tablet-text-align-inherit mobile-text-align-inherit animate-false no-animation-type testo_template\" id=\"et-heading-497851\" data-delay=\"0\" data-mobile-font=\"inherit\" data-mobile-line-height=\"inherit\" data-tablet-landscape-font=\"inherit\" data-tablet-portrait-font=\"inherit\" data-tablet-landscape-line-height=\"inherit\" data-tablet-portrait-line-height=\"inherit\" data-parallax=\"false\" data-move=\"false\" data-coordinatex=\"0\" data-coordinatey=\"0\" data-speed=\"10\"><span class=\"text-wrapper\"><span class=\"text\">Formulae for calculating the closed length<\/span><\/span><\/h4>[vc_single_image image=&#8221;51080&#8243; img_size=&#8221;full&#8221; css=&#8221;&#8221; el_class=&#8221;immagine_template&#8221;][\/vc_column_inner][vc_column_inner width=&#8221;1\/2&#8243;][vc_column_text animation_delay=&#8221;0&#8243; css=&#8221;.vc_custom_1680858196921{padding-top: 50px !important;}&#8221; el_class=&#8221;testo_template&#8221;]<strong>Data definition<\/strong><\/p>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;Formula for the calculation of the CLOSED PARCEL of the sewn flat bellows&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:6913,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">Formula for the calculation of the CLOSED LENGTH of the sewn flat bellows<\/span><\/p>\n<ul>\n<li><strong>Closed Length = NP x 2,5 + flange thickness<\/strong><\/li>\n<\/ul>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;Formula for calculating the N \u00b0 of STEPS&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:6913,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">Formula for calculating the N \u00b0 of STEPS<\/span><\/p>\n<ul>\n<li><b><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;NP = Number of steps = P.A. \/ AP + 2&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:23361,&quot;3&quot;:{&quot;1&quot;:0},&quot;9&quot;:0,&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;,&quot;17&quot;:1}\">NP = Number of steps = P.A. \/ AP + 2<\/span><\/b><\/li>\n<\/ul>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;Formula for calculating the OPENING of a step&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:6913,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">Formula for calculating the OPENING of a step<\/span><\/p>\n<ul>\n<li><b><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;AP = 1 step opening = (x-8). 1.41&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:23361,&quot;3&quot;:{&quot;1&quot;:0},&quot;9&quot;:0,&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;,&quot;17&quot;:1}\">AP = 1 step opening = (x-8). 1.41<\/span><\/b><\/li>\n<\/ul>\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;For this type of bellows, consult our technical department&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:6913,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:6381921},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">For this type of bellows, consult our technical department<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Data definitions<\/strong><\/p>\n<ul>\n<li><strong>P.A. = Open Length<\/strong><\/li>\n<li><strong>P.C. = Closed Length<\/strong><\/li>\n<\/ul>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_separator css=&#8221;.vc_custom_1635407629712{padding-top: 50px !important;padding-bottom: 50px !important;}&#8221;]<\/div><div data-target=\"tab-documentation\" class=\"false tab et-clearfix\"><h6 class=\"tab-title-tag\">Documentation<\/h6><\/div> <div id=\"tab-documentation-2\" class=\"tab-content et-clearfix\">[vc_row_inner][vc_column_inner width=&#8221;1\/2&#8243;]<h4 class=\"et-heading text-align-left tablet-text-align-inherit mobile-text-align-inherit animate-false no-animation-type testo_template\" id=\"et-heading-756204\" data-delay=\"0\" data-mobile-font=\"inherit\" data-mobile-line-height=\"inherit\" data-tablet-landscape-font=\"inherit\" data-tablet-portrait-font=\"inherit\" data-tablet-landscape-line-height=\"inherit\" data-tablet-portrait-line-height=\"inherit\" data-parallax=\"false\" data-move=\"false\" data-coordinatex=\"0\" data-coordinatey=\"0\" data-speed=\"10\"><span class=\"text-wrapper\"><span class=\"text\">Documentation<\/span><\/span><\/h4>[vc_single_image image=&#8221;52710&#8243; img_size=&#8221;full&#8221; el_class=&#8221;immagine_template&#8221;][\/vc_column_inner][vc_column_inner width=&#8221;1\/2&#8243;][vc_column_text animation_delay=&#8221;0&#8243; css=&#8221;.vc_custom_1765361203706{padding-top: 50px !important;}&#8221; el_class=&#8221;testo_template&#8221;]<a href=\"https:\/\/www.pei.it\/wp-content\/uploads\/2021\/11\/Sewn_Flat_Covers_2025.pdf\" target=\"_blank\" rel=\"noopener\"><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;Download the Sewn Flat Bellows Questionnaire&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:7041,&quot;3&quot;:{&quot;1&quot;:0},&quot;10&quot;:2,&quot;11&quot;:4,&quot;12&quot;:0,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:104922},&quot;15&quot;:&quot;Calibri, sans-serif&quot;}\">Download the Sewn Flat Bellows Questionnaire<\/span><\/a>[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_separator css=&#8221;.vc_custom_1635407731368{padding-top: 50px !important;padding-bottom: 50px !important;}&#8221;]<\/div><\/div><\/div>[\/vc_column][\/vc_row]\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_row_inner element_id=&#8221;595341&#8243;][vc_column_inner width=&#8221;3\/5&#8243;][vc_empty_space height=&#8221;50px&#8221;][\/vc_column_inner][vc_column_inner width=&#8221;2\/5&#8243;][vc_empty_space height=&#8221;20px&#8221;][vc_btn title=&#8221;Contact us for this product&#8221; style=&#8221;outline-custom&#8221; outline_custom_color=&#8221;#1e73be&#8221; outline_custom_hover_background=&#8221;#e34529&#8243; outline_custom_hover_text=&#8221;#ffffff&#8221; shape=&#8221;round&#8221; link=&#8221;url:%23form|title:TMP1-Coperture%20Telescopiche|&#8221; el_class=&#8221;bottone_template&#8221;][vc_column_text animation_delay=&#8221;0&#8243; el_class=&#8221;testo_template&#8221;]P.E.I. sewn bellows are very robust and have a very compact closed length in relation to the stroke of the bellows. These bellows are manufactured with a double seam on the folds. Since there is no [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[390,634],"tags":[],"class_list":["post-38079","post","type-post","status-publish","format-standard","hentry","category-products","category-soffietti-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sewn flat covers - PEI<\/title>\n<meta name=\"description\" content=\"P.E.I. sewn bellows are very robust and have a very compact closed length in relation to the stroke of the bellows.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pei.it\/en\/products\/flat-stitched-bellows\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sewn flat covers - 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