{"id":32127,"date":"2024-09-17T08:36:02","date_gmt":"2024-09-17T06:36:02","guid":{"rendered":"https:\/\/www.matrelec.com\/hermetic-welding\/"},"modified":"2026-01-30T18:02:55","modified_gmt":"2026-01-30T16:02:55","slug":"hermetic-welding","status":"publish","type":"page","link":"https:\/\/www.matrelec.com\/en\/hermetic-welding\/","title":{"rendered":"Hermetic welding"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"32127\" class=\"elementor elementor-32127 elementor-31490\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-690e593 e-flex e-con-boxed e-con e-parent\" data-id=\"690e593\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7dc85c8 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"7dc85c8\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Hermetic welding<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-824269a e-flex e-con-boxed e-con e-parent\" data-id=\"824269a\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-518fce4 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"518fce4\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Hermetic welding: the principles<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ab7c0d4 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"ab7c0d4\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>As a reminder, welding is the permanent joining of two parts or elements of the same nature, to ensure the long-term continuity of the material. Welding can be carried out using different technologies to join metal, plastic or wood parts. It should be remembered here that assembly techniques based on adhesion (glue) and brazing (the addition of hot external material to ensure the bond), do not fall within the scope of welding as such.  <\/p><p><span style=\"color: var( --e-global-color-text ); text-align: var(--text-align); background-color: var( --e-global-color-0d23d34 );\">The technologies used to produce hermetic welds depend on the nature of the materials to be joined.<\/span><\/p><p><span style=\"color: var( --e-global-color-text ); text-align: var(--text-align); background-color: var( --e-global-color-0d23d34 );\">For metal parts, the most commonly used assembly techniques are :<\/span><\/p><ul><li><b>electric arc welding (MIG, MAG, TIG&#8230;),<\/b><\/li><li><b>flame welding,<\/b><\/li><li><b>autogenous welding (fusion of the components to be joined) and oxy-fuel cutting,<\/b><\/li><li><b>plasma welding with tungsten electrode.<\/b><\/li><\/ul><p> <\/p><p>For plastic parts, the most commonly used assembly techniques are :<\/p><ul><li><b>high-frequency welding (assembly of different layers or parts by activating the molecules of the surfaces to be welded, without the need for physical contact between the press and the material, thanks to a high-frequency electromagnetic field),<\/b><\/li><li><b>ultrasonic welding (assembly of parts by stirring the molecules in their areas of contact with the press, using ultrasound to generate mechanical vibrations).<\/b><\/li><\/ul><p> <\/p><p>For wood parts, the only existing joining technique is friction welding (rubbing the parts against each other by applying a certain pressure), resulting in a molecular reaction of the lignin that creates the weld.  <\/p><p><span style=\"color: var( --e-global-color-text ); text-align: var(--text-align); background-color: var( --e-global-color-0d23d34 );\">Depending on their intended use, metal or plastic assemblies may be required to be hermetically sealed. Hermetic welds can only be obtained for the assembly of certain thermoplastics (PVC, PET, PS&#8230;) and metals (copper, brass, steel&#8230;). <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e9f51af elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"e9f51af\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What types of plastic can be welded?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c817b08 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"c817b08\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Plastics come in a variety of forms (rigid, semi-rigid, flexible, etc.) and have very different characteristics depending on whether they fall into the thermoplastic, thermoset or elastomer categories. These different categories of plastics have very different thermal and chemical characteristics, which may or may not allow them to be joined by welding. <\/p><p>In fact, only thermoplastics have the technical characteristics required to produce welds that are both resistant and durable. This family of materials accounts for almost 80% of the world&#8217;s plastic production, and includes all plastics that can be welded, remelted or processed without altering their mechanical properties. These manipulations are possible by subjecting thermoplastics to high temperatures, mechanical vibrations or high-frequency energy input.  <\/p><p>The plastics that can be joined by welding and are most frequently used in many sectors of activity are the following:<\/p><ul><li><b>PS or Polystyrene (thermal insulation products, floating objects, etc.),<\/b><\/li><li><b>PP or polypropylene (automotive accessories, mechanical parts, etc.),<\/b><\/li><li><b>PET or polyethylene terephthalate (disposable packaging, textile fibers, bottles, etc.),<\/b><\/li><li><b>PVC or Polyvinyl Chloride (floor coverings, doors and windows, pipes&#8230;).<\/b><\/li><\/ul><p> <\/p><p>When it comes to welding thermoplastic components to achieve a hermetic seal, the choice of welding technique is of particular importance. It will determine the possibility of combining plastics of different natures, the precision of the assembly process, the strength of the joints produced, and production rates. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9a8f3e8 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"9a8f3e8\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/www.matrelec.com\/wp-content\/uploads\/2024\/09\/img-t-1-300x300.png\" class=\"attachment-medium size-medium wp-image-31922\" alt=\"\" srcset=\"https:\/\/www.matrelec.com\/wp-content\/uploads\/2024\/09\/img-t-1-300x300.png 300w, https:\/\/www.matrelec.com\/wp-content\/uploads\/2024\/09\/img-t-1-150x150.png 150w, https:\/\/www.matrelec.com\/wp-content\/uploads\/2024\/09\/img-t-1.png 467w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-66390b7 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"66390b7\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to make hermetic welds for plastics?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-13b9277 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"13b9277\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>There are four main techniques for joining rigid or flexible plastics, as long as they belong to the thermoplastics family:<\/p><ul><li><b>cold welding or bonding (joining of components using epoxy resin or mastic, or adhesives consisting of particles or fibers in suspension to ensure weld strength);<\/b><\/li><li><b>brazing (joining by heating the parts and adding material in the form of a rod at a lower temperature than the parts to be welded, using a heat stripper or hot-air gun, based on a minimum temperature of 300 degrees);<\/b><\/li><li><b>high-frequency electrode welding (assembly of components using an electromagnetic field with a frequency of 27.12 MHz, created by a generator and diffused by one or more electrodes across the surfaces to be welded without physical contact);<\/b><\/li><li><b>ultrasonic transducer welding (assembly of components using an electric current generated by a transducer at a frequency of between 20 and 70 kHz, producing oscillations and then vibrations through direct contact with the surfaces to be welded).<\/b><\/li><\/ul><p> <\/p><p>In order to assemble thermoplastic parts or assemblies with hermetic welds, it is necessary to modify the state of the material. Only high-frequency and ultrasonic welding techniques can fuse the &#8220;lips&#8221; or &#8220;edges&#8221; of the parts or components to be joined, by means of molecular agitation. This creates hermetic welds that are both highly resistant and undetectable to the naked eye.    <\/p><p>Matrelec designs and develops high-frequency welding presses for French and European companies, enabling them to weld thermoplastic components in product or packaging form.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b9b94bb elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"b9b94bb\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What's the difference between hermetic and sealed welding?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ab072fe elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"ab072fe\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>From a technical point of view, there is no significant difference between making a hermetic weld and making a tight weld in the field of thermoplastics.<\/p><p><span style=\"color: var( --e-global-color-text ); text-align: var(--text-align); background-color: var( --e-global-color-0d23d34 );\">The concept of weld-tightness applies to the assembly of components of a container (bag or pouch) which must contain liquids without risk of loss or leakage.<\/span><\/p><p><span style=\"color: var( --e-global-color-text ); text-align: var(--text-align); background-color: var( --e-global-color-0d23d34 );\">The concept of hermetic sealing refers to the assembly of components of a container (pouch or bag) designed to hold solid or liquid products under vacuum, i.e. without the potential ingress of outside air which could damage them if the preservation conditions are not respected.<\/span><\/p><p><span style=\"color: var( --e-global-color-text ); text-align: var(--text-align); background-color: var( --e-global-color-0d23d34 );\">Whatever your company&#8217;s needs for hermetic or airtight thermoplastic welding, Matrelec has a range of welding rails and high-frequency welding presses for high-speed assembly.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b348ce0 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"b348ce0\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/shop.matrelec.com\/fr\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-right\" viewBox=\"0 0 320 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M285.476 272.971L91.132 467.314c-9.373 9.373-24.569 9.373-33.941 0l-22.667-22.667c-9.357-9.357-9.375-24.522-.04-33.901L188.505 256 34.484 101.255c-9.335-9.379-9.317-24.544.04-33.901l22.667-22.667c9.373-9.373 24.569-9.373 33.941 0L285.475 239.03c9.373 9.372 9.373 24.568.001 33.941z\"><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Discover our online store<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Hermetic welding: the principles As a reminder, welding is the permanent joining of two parts or elements of the same nature, to ensure the long-term continuity of the material. Welding can be carried out using different technologies to join metal, plastic or wood parts. It should be remembered here that assembly techniques based on adhesion [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-32127","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.matrelec.com\/en\/wp-json\/wp\/v2\/pages\/32127","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.matrelec.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.matrelec.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.matrelec.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.matrelec.com\/en\/wp-json\/wp\/v2\/comments?post=32127"}],"version-history":[{"count":2,"href":"https:\/\/www.matrelec.com\/en\/wp-json\/wp\/v2\/pages\/32127\/revisions"}],"predecessor-version":[{"id":38286,"href":"https:\/\/www.matrelec.com\/en\/wp-json\/wp\/v2\/pages\/32127\/revisions\/38286"}],"wp:attachment":[{"href":"https:\/\/www.matrelec.com\/en\/wp-json\/wp\/v2\/media?parent=32127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}