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<\/p>\nAmong all ring die parameters, compression ratio is the most critical yet most confusing. Too high, and output drops; too low, and pellets fall apart. Here’s what you need to know to get it right.
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1. What Is Compression Ratio?<\/strong> Compression ratio = Effective hole length \u00f7 Hole diameter<\/strong> It reflects the extrusion intensity on the material: Higher ratio \u2192 denser, harder pellets Lower ratio \u2192 higher output, but looser pellets The goal is to find the right balance for your specific material and product requirements. 2. How to Calculate It<\/strong> The “effective length” varies by hole type: <\/br><\/p>\n Example:<\/strong> Hole diameter 8mm, die thickness 66mm, relief hole 18mm Compression ratio = 48 \u00f7 8 = 1:6<\/strong> 3. Reference Ratios for Common Raw Materials<\/strong> <\/br><\/p>\n Important:<\/strong> These are empirical references only. Always verify through actual testing with your own material.<\/strong> 4. Moisture Content Matters<\/strong> < 12% (dry):<\/strong> Lower compression ratio recommended to prevent excess fines 12% \u2013 18%:<\/strong> Optimal range \u2013 select ratio by material type > 18% (wet):<\/strong> Moderate-to-low ratio to avoid blocking 5. Three Common Mistakes<\/strong> Copying others’ ratios blindly<\/strong> \u2013 different machines, speeds, and designs yield different results Chasing max output with the lowest ratio<\/strong> \u2013 loose pellets create more fines and downstream losses Assuming highest ratio = best quality<\/strong> \u2013 over-dense pellets crack easily and waste energy 6. A Simple Selection Process<\/strong> \uff081\uff09Identify your raw material and typical moisture range \uff082\uff09Use the reference table to pick a starting ratio \uff083\uff09Run a test batch \u2013 measure output, hardness, and fines \uff084\uff09Adjust up or down until both output and quality meet your needs \uff085\uff09Record the optimal ratio for future orders Tip:<\/strong> If you process multiple materials, keep two ring dies with different ratios and swap as needed \u2013 one size rarely fits all. About Us<\/strong> We manufacture ring dies and complete pellet production lines. If you’re unsure about the right compression ratio for your material, send us your raw material details and target output. We can offer initial recommendations based on test data. \ud83d\udce7 Email: sylvia@woodymech.com<\/p>","protected":false},"excerpt":{"rendered":" IntroductionSelecting the right material is one of the most important decisions in CNC manufacturing. Different metals respond differently to cutting…<\/p>","protected":false},"author":1,"featured_media":1443,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[46],"tags":[],"class_list":["post-1045","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/posts\/1045","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/comments?post=1045"}],"version-history":[{"count":6,"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/posts\/1045\/revisions"}],"predecessor-version":[{"id":1446,"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/posts\/1045\/revisions\/1446"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/media\/1443"}],"wp:attachment":[{"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/media?parent=1045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/categories?post=1045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.woodymech.com\/ru\/wp-json\/wp\/v2\/tags?post=1045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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\n Hole Type<\/td>\n Effective Length<\/td>\n<\/tr>\n \n Straight hole<\/td>\n Total die thickness<\/td>\n<\/tr>\n \n Relief-type stepped hole<\/td>\n Total thickness \u2013 relief hole length<\/td>\n<\/tr>\n \n Compression-type stepped hole<\/td>\n Total thickness (usually)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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\nEffective length = 66 \u2013 18 = 48mm
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\n Raw Material<\/td>\n Compression Ratio Range<\/td>\n<\/tr>\n \n Eucalyptus<\/td>\n 1:3.7 \u2013 1:4<\/td>\n<\/tr>\n \n Rosewood<\/td>\n 1:4 \u2013 1:4.5<\/td>\n<\/tr>\n \n Mixed hardwoods<\/td>\n ~1:4.5<\/td>\n<\/tr>\n \n Pine<\/td>\n 1:5 \u2013 1:6<\/td>\n<\/tr>\n \n Poplar<\/td>\n 1:6 \u2013 1:7<\/td>\n<\/tr>\n \n Bamboo shavings<\/td>\n ~1:4<\/td>\n<\/tr>\n \n Corn straw<\/td>\n 1:6 \u2013 1:8<\/td>\n<\/tr>\n \n Grasses<\/td>\n 1:9 \u2013 1:10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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