{"id":8327,"date":"2026-04-15T09:00:00","date_gmt":"2026-04-15T08:00:00","guid":{"rendered":"https:\/\/uplastech.com\/thermoforming-cosmetic-packaging\/"},"modified":"2026-04-15T09:00:00","modified_gmt":"2026-04-15T08:00:00","slug":"thermoforming-cosmetic-packaging","status":"publish","type":"post","link":"https:\/\/uplastech.com\/es\/thermoforming-cosmetic-packaging\/","title":{"rendered":"Cosmetic Packaging: Surface Finish as the Product"},"content":{"rendered":"<style>\n.upl-blog{font-size:17px;line-height:1.78;color:#1f2937}\n.upl-blog p{margin:0 0 18px}\n.upl-blog h2{font-size:26px;line-height:1.3;color:#0b2b33;margin:46px 0 14px;font-weight:700;letter-spacing:-.015em}\n.upl-blog h3{font-size:19.5px;color:#0d3b47;margin:28px 0 10px;font-weight:700}\n.upl-blog ul,.upl-blog ol{margin:0 0 20px;padding-left:22px}\n.upl-blog li{margin:0 0 9px}\n.upl-blog figure{margin:0 0 34px}\n.upl-blog figure img{width:100%;height:auto;display:block;border-radius:10px}\n.upl-blog figcaption{font-size:13px;color:#6b7280;margin-top:10px;line-height:1.5}\n.upl-blog .toc{background:none;border:0;border-radius:0;padding:0;margin:0 0 34px}\n.upl-blog .toc .lwptoc{margin:0}\n.upl-blog .toc h4{margin:0 0 10px;font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#0d5563}\n.upl-blog .toc ol{margin:0;padding-left:18px;font-size:14.5px}\n.upl-blog .toc li{margin-bottom:6px}\n.upl-blog table{width:100%;border-collapse:collapse;font-size:14.5px;margin:0 0 10px}\n.upl-blog th{background:#0d3b47;color:#fff;text-align:left;padding:11px 13px;font-weight:600;font-size:13.5px;border:0}\n.upl-blog td{padding:11px 13px;border:0;border-bottom:1px solid #e8ebed;vertical-align:top}\n.upl-blog tbody tr:nth-child(even){background:#fafbfc}\n.upl-blog .tablecap{font-size:12.5px;color:#6b7280;margin:0 0 30px}\n.upl-blog .myth{background:#fff8ef;border:1px solid #f6ddbd;border-radius:8px;padding:16px 20px;margin:0 0 26px;font-size:15.5px}\n.upl-blog .myth b{color:#a85c10}\n.upl-blog .callout{background:#f2f8f9;border-radius:8px;padding:18px 22px;margin:0 0 26px;font-size:15.5px;border-left:3px solid #14707f}\n.upl-blog .faq h3{border-top:1px solid #eceff1;padding-top:22px;margin-top:0;font-size:18px}\n.upl-blog .faq h3:first-of-type{border-top:0;padding-top:0}\n.upl-blog .cta{background:linear-gradient(135deg,#0b2b33,#0d5563);color:#fff;border-radius:12px;padding:34px;margin:48px 0 30px}\n.upl-blog .cta h2,.upl-blog .cta .cta-h{color:#fff;margin:0 0 10px;font-size:24px;font-weight:700;line-height:1.3}\n.upl-blog .cta p{color:#c9dee3;margin:0 0 20px;font-size:16px}\n.upl-blog .btn{display:inline-block;background:#e07a1f;color:#fff;text-decoration:none;font-weight:700;padding:13px 26px;border-radius:8px;font-size:15.5px}\n.upl-blog .rel{border-top:1px solid #e8ebed;margin-top:40px;padding-top:26px}\n.upl-blog .rel h4{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#6b7280;margin:0 0 14px}\n.upl-blog .rel ul{list-style:none;padding:0;margin:0}\n.upl-blog .rel li{padding:11px 0;border-bottom:1px dashed #e8ebed}\n.upl-blog .rel a{text-decoration:none;font-weight:600;font-size:15.5px}\n@media(max-width:640px){.upl-blog h2{font-size:22px}.upl-blog table{font-size:13px}.upl-blog .cta{padding:24px}}\n\/* \u5355\u7bc7\u9875\u9690\u85cf WhatsApp \u95ee\u5019\u5361\uff0c\u53ea\u4fdd\u7559\u5706\u5f62\u6c14\u6ce1\uff0c\u907f\u514d\u906e\u6321\u4fa7\u680f\u8be2\u76d8\u63d0\u4ea4\u6309\u94ae\u3002\n   \u6ce8\u610f\uff1aClick to Chat \u7684\u70b9\u51fb\u903b\u8f91\u662f\u300c\u95ee\u5019\u5361\u5143\u7d20\u5b58\u5728\u5c31\u4e0d\u8df3\u8f6c\u300d\uff0c\u53ea\u9760 CSS \u9690\u85cf\u4f1a\u8ba9\u6c14\u6ce1\u53d8\u6210\u6b7b\u94fe\u63a5\u3002\n   Code Snippets #9\u300cUPL single post: WhatsApp bubble jumps straight to chat\u300d\u8d1f\u8d23\u628a\u8be5\u8282\u70b9\u4ece DOM \u79fb\u9664\uff0c\n   \u4e0b\u9762\u8fd9\u6761 CSS \u53ea\u662f\u79fb\u9664\u524d\u7684\u89c6\u89c9\u515c\u5e95\u3002\u5220 #9 \u524d\u5fc5\u987b\u5148\u5220\u8fd9\u6761\u89c4\u5219\u3002 *\/\nbody.single-post .ht_ctc_chat_greetings_box{display:none !important}\n<\/style>\n<div class=\"upl-blog\">\n<figure>\n<img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/10\/thermoforming-cosmetic-packaging.jpg\" alt=\"A vacuum forming machine with a freshly formed clear PET sheet shaped into a row of shallow cosmetic jar inserts, and a tray of glossy white containers on the outfeed table\" width=\"1536\" height=\"909\"><figcaption>A formed PET insert tray straight off the platen, and the containers it will carry. The surface is what the customer buys.<\/figcaption><\/figure>\n<div class=\"toc\"><\/div>\n<h2 id=\"product\">In cosmetics the surface is the product<\/h2>\n<p>A cosmetic pack is handled before it is opened. It is picked up in a shop, turned over, and judged by how it feels and how it reflects light. A 0.1 mm sink mark on an industrial housing is a defect; the same mark on a cream jar lid is a reason not to buy.<\/p>\n<p>That changes the process window. A thermoformed pack has to be dimensionally correct, which is the easy part, and optically correct, which is not. Gloss, colour depth and the absence of flow marks are all set by the tool surface and the sheet temperature, and both have narrow windows.<\/p>\n<p>It also changes the material choice. Cosmetic packs are usually PET, PETG, PP or PS, and they are usually decorated: hot stamped, screen printed, labelled or sleeved. Every one of those processes needs a surface with a known energy and a known roughness, so the surface is not just a look, it is a process input.<\/p>\n<p>The consequence is that a cosmetic pack is specified on a surface standard, not just a drawing. That standard has to be measurable, and gloss units and texture depth are how it is measured.<\/p>\n<h2 id=\"gloss\">Gloss is a mould temperature decision first<\/h2>\n<p>Gloss comes from how faithfully the plastic replicates the tool surface. A polished tool replicated at the right temperature gives a mirror; the same tool replicated cold gives a surface covered in fine wrinkles that scatter light, which is orange peel.<\/p>\n<p>On a measured PETG jar shell, gloss at 60 degrees went 58 units at a 60 C mould, 66 at 70, 74 at 80, 81 at 90, 87 at 100, 89 at 110, 86 at 120 and 74 at 130. The peak is broad and it sits at 100 to 115 C, which is a 15 degree window rather than a range.<\/p>\n<p>Below the window the sheet touches the tool and freezes before it has flowed into the surface. Above it the sheet stays soft too long, sticks to the tool, and on ejection the surface is dragged. Both ends of the curve look like a surface defect and both are temperature.<\/p>\n<p>The window moves with the material. PET needs a hotter tool than PP, and a 200 micrometre sheet needs a hotter tool than a 500 micrometre one, because the thin sheet loses heat to the tool faster. A tool built for one gauge is not automatically right for another.<\/p>\n<figure>\n<img decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/10\/thermoforming-cosmetic-packaging-chart.jpg\" alt=\"Gloss at 60 degrees peaking at 89 units around 110 degrees C mould temperature and falling to 74 at 130, and gloss falling from 91 units on a smooth tool to 8 units at a 35 micrometre texture depth\" width=\"1536\" height=\"909\"><figcaption>Left: gloss against mould temperature, 89 GU at 110 C and 74 at 130, with a workable window from 100 to 115 C. Right: gloss against texture depth, 91 GU smooth and 8 GU at 35 micrometres.<\/figcaption><\/figure>\n<h2 id=\"texture\">Texture is a gloss dial<\/h2>\n<p>A textured tool is a tool with a controlled roughness, applied by etching or by laser. The depth of that roughness sets the gloss, and the relationship is steep at shallow depths and flattens out.<\/p>\n<p>On a measured set, a smooth tool gave 91 gloss units, a 5 micrometre texture 63, 10 micrometres 41, 15 micrometres 28, 20 micrometres 19, 28 micrometres 12 and 35 micrometres 8. A 20 micrometre texture takes a mirror to a matte, which is the whole range a cosmetic brand usually asks for.<\/p>\n<p>Texture has a second job, which is hiding. A matte surface hides flow marks, minor sink and the fine scratches that a glossy surface shows at once. That is why so many cosmetic packs are matte: not because matte is the fashion, but because matte is forgiving in a way gloss is not.<\/p>\n<p>Texture has a cost. A textured tool is harder to clean, it releases less readily, and it wears: the peaks polish down over tens of thousands of shots and the gloss rises as they do. A tool specified at 20 micrometres will be at 12 micrometres and higher gloss after 100,000 shots, and the customer will notice.<\/p>\n<table>\n<thead>\n<tr>\n<th>Texture depth<\/th>\n<th>Gloss<\/th>\n<th>Look<\/th>\n<th>Hides what<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0 (polished)<\/td>\n<td>91 GU<\/td>\n<td>Mirror<\/td>\n<td>Nothing<\/td>\n<\/tr>\n<tr>\n<td>5 micrometre<\/td>\n<td>63 GU<\/td>\n<td>Semi gloss<\/td>\n<td>Fine flow marks<\/td>\n<\/tr>\n<tr>\n<td>10 micrometre<\/td>\n<td>41 GU<\/td>\n<td>Satin<\/td>\n<td>Flow marks, light sink<\/td>\n<\/tr>\n<tr>\n<td>15 micrometre<\/td>\n<td>28 GU<\/td>\n<td>Matte<\/td>\n<td>Sink, minor scratches<\/td>\n<\/tr>\n<tr>\n<td>20 micrometre<\/td>\n<td>19 GU<\/td>\n<td>Deep matte<\/td>\n<td>Sink, handling marks<\/td>\n<\/tr>\n<tr>\n<td>35 micrometre<\/td>\n<td>8 GU<\/td>\n<td>Coarse matte<\/td>\n<td>Almost everything<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 1 \u2014 Texture depth as a gloss specification<\/p>\n<h2 id=\"sheet\">Sheet, gauge and the draw ratio the surface will take<\/h2>\n<p>A thermoformed pack is made from a flat sheet that is stretched into a shape, so the wall of the finished part is thinner than the sheet. The ratio of the two is the draw ratio, and it decides both how much the surface stretches and how much it thins.<\/p>\n<p>A 500 micrometre PETG sheet formed into a 40 mm deep jar gives a base around 180 micrometres and a wall around 300. That is a draw ratio of about 2.7, which is comfortable. Push the same sheet to 80 mm deep and the base drops to 90 micrometres, the surface stretches beyond its ability to hold a polish, and the gloss falls off a cliff.<\/p>\n<p>That cliff is why deep cosmetic packs are pressure formed and why they are often made from a thicker sheet than the wall would suggest. The extra gauge is there to survive the draw, not to make the part stronger.<\/p>\n<p>The material matters too. PETG replicates a tool surface better than PP because it has a sharper softening range and holds the tool surface as it freezes. PP is more forgiving of draw depth and worse at gloss. A brand that wants a mirror and a deep draw is usually choosing PETG and paying for pressure forming.<\/p>\n<table>\n<thead>\n<tr>\n<th>Material<\/th>\n<th>Gloss potential<\/th>\n<th>Draw depth<\/th>\n<th>Note<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>PETG<\/td>\n<td>Excelente<\/td>\n<td>Moderado<\/td>\n<td>Best surface, narrow window<\/td>\n<\/tr>\n<tr>\n<td>PET<\/td>\n<td>Very good<\/td>\n<td>Moderado<\/td>\n<td>Needs drying, brittle corners<\/td>\n<\/tr>\n<tr>\n<td>PP<\/td>\n<td>Feria<\/td>\n<td>Deep<\/td>\n<td>Forgiving, low gloss<\/td>\n<\/tr>\n<tr>\n<td>PS<\/td>\n<td>Very good<\/td>\n<td>Moderado<\/td>\n<td>Cheap, brittle, glossy<\/td>\n<\/tr>\n<tr>\n<td>PVC<\/td>\n<td>Bien<\/td>\n<td>Deep<\/td>\n<td>Shrinks, needs control<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 2 \u2014 Material against surface and draw<\/p>\n<h2 id=\"tool\">What transfers from the tool, and what does not<\/h2>\n<p>A thermoforming tool transfers its surface only where the sheet actually touches it. On a simple shape that is everywhere; on a deep draw with sharp corners the sheet bridges, and the corner is replicated at lower pressure and lower gloss. That is why a deep cosmetic pack can have a glossy face and a matte corner from the same tool.<\/p>\n<p>The fix is pressure. Vacuum alone gives about one bar, which is enough on a flat face and not enough in a corner. Pressure forming, at 4 to 8 bar, pushes the sheet into the corner and replicates the texture there too. A cosmetic pack with a deep draw and a uniform matte finish is almost always pressure formed.<\/p>\n<p>The second issue is tool material. An aluminium tool conducts heat fast and cools the sheet quickly, which shortens the cycle and narrows the temperature window. A steel tool is slower and more forgiving. For a cosmetic pack where surface is critical, the slower tool is often the better one.<\/p>\n<p>The third is tool maintenance. A polished tool picks up a film of condensed volatiles after a few thousand shots, and the gloss drops. Cleaning restores it, and the cleaning interval becomes part of the quality plan. A tool that is cleaned every shift holds its gloss; one cleaned when somebody notices does not.<\/p>\n<table>\n<thead>\n<tr>\n<th>Forming method<\/th>\n<th>Presi\u00f3n<\/th>\n<th>Corner replication<\/th>\n<th>Lo mejor para<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Vacuum only<\/td>\n<td>1 bar<\/td>\n<td>Poor in sharp corners<\/td>\n<td>Shallow trays, low volume<\/td>\n<\/tr>\n<tr>\n<td>Vacuum plus plug<\/td>\n<td>1 bar<\/td>\n<td>Good with a matched plug<\/td>\n<td>Deep draws, simple shapes<\/td>\n<\/tr>\n<tr>\n<td>Pressure forming<\/td>\n<td>4 to 8 bar<\/td>\n<td>Excelente<\/td>\n<td>Cosmetic packs, deep draws<\/td>\n<\/tr>\n<tr>\n<td>Twin sheet<\/td>\n<td>1 bar each side<\/td>\n<td>Hollow parts<\/td>\n<td>Bottles, cases<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 3 \u2014 Forming method against surface replication<\/p>\n<h2 id=\"handling\">Handling, dust and the last ten metres<\/h2>\n<p>A cosmetic pack that is perfect at the machine can be rejected at packing. The last ten metres of the line are where most surface defects are made: parts stacked while still warm pick up the texture of the part below, parts slid across a table get fine scratches, and parts handled without gloves get fingerprints that only show after printing.<\/p>\n<p>Warm stacking is the most common. A thermoformed part is dimensionally stable when it is cool, and it is not cool when it comes off the platen. Stacking at 40 C instead of 25 C doubles the time to reach stability and marks the surface where the parts touch.<\/p>\n<p>Dust is the second. A glossy surface shows every particle, and a matte one shows fewer but holds more. An ionised air knife before printing is standard on a cosmetic line, and so is a covered conveyor.<\/p>\n<p>The third is gloves. Cotton gloves leave lint; nitrile gloves leave fingerprints if the part is not clean. A cosmetic line usually runs bare hands on the formed part and gloves on the printed one, which is the opposite of what most factories do first.<\/p>\n<div class=\"myth\">Myth: gloss is a tool finish, so a polished tool always gives a glossy part. It gives a glossy part only inside a 15 degree mould temperature window. On a measured PETG shell the same polished tool gave 58 gloss units at 60 C and 89 at 110, and 74 at 130 because the surface was dragged on ejection.<\/div>\n<div class=\"faq\">\n<h3>What mould temperature gives the best gloss?<\/h3>\n<p>On PETG it is 100 to 115 C, peaking at 89 gloss units around 110. Below that the sheet freezes before it replicates; above it the part sticks and the surface is dragged on ejection.<\/p>\n<h3>How deep a texture do I need for a matte finish?<\/h3>\n<p>About 15 to 20 micrometres. A 15 micrometre texture gives 28 gloss units and a 20 micrometre one gives 19, which is the matte range most cosmetic brands specify.<\/p>\n<h3>Why does the corner of my pack look different from the face?<\/h3>\n<p>Because the sheet bridged the corner and never touched the tool there. Vacuum alone gives one bar; pressure forming at 4 to 8 bar pushes the sheet into the corner and replicates the texture.<\/p>\n<h3>Does texture wear out?<\/h3>\n<p>Yes. The peaks polish down over tens of thousands of shots and the gloss rises. A tool specified at 20 micrometres can be at 12 after 100,000 shots, and the customer will see the difference.<\/p>\n<h3>Can I print on a textured surface?<\/h3>\n<p>Yes, and it hides registration errors. A matte surface holds ink well but needs a higher ink film weight than a gloss one, and the print will be matte unless it is varnished.<\/p>\n<h3>Why do parts mark in the box?<\/h3>\n<p>Warm stacking. A part stacked at 40 C instead of 25 C takes twice as long to stabilise and picks up the texture of the part below. Cool before stacking, or stack fewer per layer.<\/p>\n<\/div>\n<div class=\"cta\">\n<p class=\"cta-h\">A cosmetic pack where the surface has to match a standard, not a drawing?<\/p>\n<p>Send the material, the gauge, the draw depth and the gloss or texture target. We will tell you what the tool and the forming method have to be.<\/p>\n<p><a class=\"btn\" href=\"https:\/\/uplastech.com\/es\/formacion-al-vacio\/\">Ask about cosmetic packaging<\/a>\n<\/div>\n<div class=\"rel\">\n<h4>Continue reading<\/h4>\n<ul>\n<li><a href=\"https:\/\/uplastech.com\/es\/thermoforming-mold-texture\/\">Thermoforming Mold Texture: Grain, Depth and Gloss<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/es\/thermoforming-cooling-cycle\/\">Thermoforming Cooling Cycle: Time, Temperature and Warp<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/es\/thermoforming-cnc-trimming\/\">Thermoforming CNC Trimming: Tolerance and Finish<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/es\/thermoforming-trimming-methods\/\">Thermoforming Trimming Methods Compared<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/es\/formacion-al-vacio\/\">Vacuum Forming: Process, Tooling and Tolerances<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>In cosmetics the surface is the product. A 15 C mould temperature window separates orange peel from sticking, and a 20 micrometre texture takes gloss from 91 to 19.<\/p>","protected":false},"author":1,"featured_media":8325,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[],"class_list":["post-8327","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vacuum-forming"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/posts\/8327","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/comments?post=8327"}],"version-history":[{"count":0,"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/posts\/8327\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/media\/8325"}],"wp:attachment":[{"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/media?parent=8327"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/categories?post=8327"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/uplastech.com\/es\/wp-json\/wp\/v2\/tags?post=8327"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}