{"id":17277,"date":"2022-10-05T03:00:16","date_gmt":"2022-10-05T08:00:16","guid":{"rendered":"https:\/\/www.insta-pro.com\/?p=17277"},"modified":"2026-01-07T13:49:41","modified_gmt":"2026-01-07T19:49:41","slug":"the-importance-of-extrusion-cooking","status":"publish","type":"post","link":"https:\/\/instapro.spinuhost.com\/en\/blog\/engineeringandextrusionprocess\/the-importance-of-extrusion-cooking\/","title":{"rendered":"Part 1: The Importance of Extrusion Cooking"},"content":{"rendered":"<p>Cooking of foods is an everyday operation that finds usefulness in both domestic and commercial settings. In cooking, heat is used to prepare food for consumption. There are several reasons for cooking but at its core, cooking converts food into a more digestible form. This improved digestibility means that the calories and nutrients contained in the food are more easily absorbed by humans and animals. Cooking on an industrial scale requires cooking large quantities of food, in as little time as possible, while still maintaining high quality and adequate food safety standards. One method of achieving this is by applying extrusion technology to the field of cooking.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.insta-pro.com\/en\/blog\/engineeringandmaintenance\/how-does-an-extruder-work\/\">Extrusion<\/a> can be thought of as a continuous process for mixing and pumping material. When shear and heat (and in some cases pressure) are thrown into the mix, the extruder can be used to cook the material. The extrusion cooking process is typically carried out in an extruder which basically consists of a rotating screw housed within a barrel (or compression chamber). \u00a0<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-17337\" src=\"https:\/\/www.insta-pro.com\/wp-content\/uploads\/2022\/10\/Extruder-barrel-1024x448.png\" alt=\"\" width=\"1024\" height=\"448\" srcset=\"https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/Extruder-barrel-1024x448.png 1024w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/Extruder-barrel-300x131.png 300w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/Extruder-barrel-768x336.png 768w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/Extruder-barrel-750x328.png 750w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/Extruder-barrel-564x247.png 564w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/Extruder-barrel-940x411.png 940w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/Extruder-barrel.png 1128w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p><em>Figure 1. Single Screw Extruder<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>The flow of material through the extruder is restricted by placing a die at the discharge end of the extruder (see Figure 1). In some cases, other restrictive elements (such as steam locks) are also placed along the length of the extruder screw. (see Figure 2)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-17333\" src=\"https:\/\/www.insta-pro.com\/wp-content\/uploads\/2022\/10\/steamlock-diagram-1024x577.png\" alt=\"\" width=\"1024\" height=\"577\" srcset=\"https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/steamlock-diagram-1024x577.png 1024w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/steamlock-diagram-300x169.png 300w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/steamlock-diagram-768x433.png 768w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/steamlock-diagram-570x320.png 570w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/steamlock-diagram-750x423.png 750w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/steamlock-diagram-564x318.png 564w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/steamlock-diagram-940x530.png 940w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/steamlock-diagram.png 1236w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p><em>Figure 2. Steamlocks Inside Extruder Barrel<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>These restrictions to flow act to increase the residence time, of the material, within the extruder and cause a pressure build-up along the length of the extruder. The pressure increases from the inlet to the discharge. Since materials naturally tend to flow \u201cdownhill\u201d along a pressure gradient, the pressure build-up forces material to flow back towards the extruder inlet.<\/p>\n<p>&nbsp;<\/p>\n<p>On the other hand, the rotation of the extruder screw \u201cdrags\u201d material from the inlet towards the outlet. The interplay between the forward \u201cdrag\u201d flow and the backward pressure driven flow determines the net flow rate of material and cause the extruder to operate between the two extremes of zero pressure flow (open discharge) on one end, and a blocked discharge (where the pressure driven flow is equal to the forward drag flow) on the other end (see Figure 3). To generate a net flow through the Extruder, the mechanical energy supplied to the screw shaft must be sufficient to overcome the backward pressure driven flow.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17341\" src=\"https:\/\/www.insta-pro.com\/wp-content\/uploads\/2022\/10\/extrusion-graph.png\" alt=\"\" width=\"923\" height=\"506\" srcset=\"https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/extrusion-graph.png 923w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/extrusion-graph-300x164.png 300w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/extrusion-graph-768x421.png 768w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/extrusion-graph-750x411.png 750w, https:\/\/instapro.spinuhost.com\/wp-content\/uploads\/2022\/10\/extrusion-graph-564x309.png 564w\" sizes=\"auto, (max-width: 923px) 100vw, 923px\" \/><\/p>\n<p><em>Figure 3. Pressure vs Flowrate for a Typical Single Screw Extruder<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>In Part 2, we will dive deeper into this process and discuss the key advantages the heat created by friction brings to the output ingredients by combining extrusion and cooking into one unit.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cooking of foods is an everyday operation that finds usefulness in both domestic and commercial settings. In cooking, heat is used to prepare food for consumption. There are several reasons for cooking but at its core, cooking converts food into a more digestible form. This improved digestibility means that the calories and nutrients contained in [&hellip;]<\/p>\n","protected":false},"author":57,"featured_media":17383,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[51],"tags":[147,63,27,60],"class_list":["post-17277","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-engineeringandextrusionprocess","tag-extrusion-cooking","tag-extrusion-equipment-maintenance","tag-extrusion-processing-solutions","tag-extrusion-services"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.2 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Part 1: The Importance of Extrusion Cooking - Insta-Pro<\/title>\n<meta name=\"description\" content=\"How does an extruder work? Not all extruders are created equal. Understanding how time and temperature in the barrel work is key.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/instapro.spinuhost.com\/en\/blog\/engineeringandextrusionprocess\/the-importance-of-extrusion-cooking\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Part 1: The Importance of Extrusion Cooking\" \/>\n<meta property=\"og:description\" content=\"How does an extruder work? Not all extruders are created equal. 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