{"id":3672,"date":"2023-11-14T06:17:31","date_gmt":"2023-11-13T23:17:31","guid":{"rendered":"https:\/\/asg.vn\/?p=3672"},"modified":"2024-05-18T09:28:37","modified_gmt":"2024-05-18T02:28:37","slug":"elementor-3504-2","status":"publish","type":"post","link":"https:\/\/asg.vn\/en\/elementor-3504-2\/","title":{"rendered":"DESIGN PLASTIC INJECTION MACHINE SCREW ACCORDING TO REQUIREMENTS"},"content":{"rendered":"<p><a role=\"button\">\u00a0<\/a><\/p>\n<h2><strong>I. Why design a plastic injection molding machine screw?<\/strong><\/h2>\n<p>This is the first question that arises when talking about this issue because customers when buying a plastic injection molding machine from a plastic injection molding machine company do not need to pay attention to the design because that need has been met by the plastic injection molding machine company. So in what cases does the need to design a plastic injection molding machine screw appear?<\/p>\n<p>1. Change the production plastic strain.<\/p>\n<p>There are many different strains of plastic on the market, each with different properties, so there will also be a need for screws with different designs to suit each type.<\/p>\n<p>If the design is not suitable, there may be an error of not being able to get the plastic; irregular plastic retrieval time; the plastic has not reached maturity when sprayed into the mold....<\/p>\n<p>2. Screw barrel lifting\/Screw barrel lowering.<\/p>\n<p>Changing the screw diameter and length requires redesign.<\/p>\n<p>3. The old design does not meet the needs of use.<\/p>\n<p>The shaft does not have the color mixing function but starts producing color products.<\/p>\n<p>Plastic adheres to the screw shaft causing black marks on the product<\/p>\n<p>Slow resin extraction time, resin not visible<\/p>\n<p>4. Old design does not guarantee durability<\/p>\n<p>Wear and tear<\/p>\n<h2><strong>II. Plastic injection molding machine screw design<\/strong><\/h2>\n<h3><strong>II.1 Function of plastic injection molding machine screw<\/strong><\/h3>\n<p>The plastic injection screw is an important component in the plastic injection machine. It is a spiral shape that helps transfer raw materials in granular form from the hole to the plastic nozzle in liquid form.<\/p>\n<p>Refer to the following video to clearly understand its uses<\/p>\n<div style=\"width: 640px;\" class=\"wp-video\"><!--[if lt IE 9]><script>document.createElement('video');<\/script><![endif]-->\n<video class=\"wp-video-shortcode\" id=\"video-3672-1\" width=\"640\" height=\"360\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/Injection-Molding-Animation.mp4?_=1\" \/><a href=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/Injection-Molding-Animation.mp4\">https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/Injection-Molding-Animation.mp4<\/a><\/video><\/div>\n<h3><strong>II.2 Structure of plastic injection machine screw<\/strong><\/h3>\n<p>The basic screw is composed of 3 parts:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-1-1024x290.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-1-1024x290.png 1024w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-1-300x85.png 300w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-1-768x218.png 768w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-1.png 1119w\" alt=\"\" width=\"1024\" height=\"290\" \/><\/p>\n<p><strong>\ud83d\udd39 Screw part<\/strong><\/p>\n<p>The screw part is a screw-shaped section consisting of 3 regions: feeding region, compression region, and dosing region<\/p>\n<p>&#8211;<em> <strong>Material region<\/strong><\/em>: The task is to push the plastic particles from the hole down the plastic to go around the cylinder barrel.<\/p>\n<p>&#8211; <em><strong>Compression zone:<\/strong><\/em>: The task is to compress the plastic volume from a large volume to a smaller volume (because the plastic changes from a stacked particle structure to molten plastic)<\/p>\n<p>&#8211; <strong><em>Quantitative area:<\/em><\/strong>: The task is to stabilize the structure of the liquid mass to prepare for injection into the mold.<\/p>\n<p>Depending on the type of plastic, the ratio of the length of these segments to the diameter will be different, and the compression ratio of the compression zone will also be similar.<\/p>\n<p>\ud83d\udd39 <strong>Threaded part and centering hole<\/strong><\/p>\n<p>\u2013 The threaded part is used to assemble the rocket head onto the screw<\/p>\n<p>\u2013 Centering hole to center the rocket head and screw, limiting the phenomenon of rotation when the rocket head rotates.<\/p>\n<p><strong>\ud83d\udd39 Shank &amp; key part<\/strong><\/p>\n<p>This part is to connect and drive the machine capacitor<\/p>\n<p>To handle rotational motion, a key is needed (there are many different types of keys according to the manufacturer's design, the most common are flat key, rectangular key, stem key...)<\/p>\n<p>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-2.png\" sizes=\"(max-width: 831px) 100vw, 831px\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-2.png 831w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-2-300x36.png 300w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-2-768x92.png 768w\" alt=\"\" width=\"831\" height=\"100\" \/><\/p>\n<h2><strong>III. Plastic injection molding machine screw design<\/strong><\/h2>\n<h3><strong>Step 1:<\/strong> Clarify the problem: Clarify the reason for designing the screw shaft according to the reasons mentioned in Part I.<\/h3>\n<h3><strong>Step 2<\/strong> Depending on each problem, different ways of handling will be determined.<\/h3>\n<h4><strong>2.1.<\/strong> Change the plastic type, the current shaft does not meet the pressing mode.<\/h4>\n<p>This case occurs when the two types of plastic before and after are too different in properties.<\/p>\n<p>For example, switching from producing ABS plastic for household appliances to PET plastic for producing cable ties \u279c will not be able to produce cable ties that meet requirements.<\/p>\n<p>\u279c Redesigned screw section to accommodate new plastic<\/p>\n<h4><strong>2.2. <\/strong>Switch to color plastic injection molding, current shaft is discolored<\/h4>\n<p>Because the current shaft does not have the function of mixing plastic, the color is not mixed evenly.<\/p>\n<p>\u279c New design, additional spiral groove and star fruit segment added to increase plastic mixing ability<\/p>\n<h4><strong>2.3. <\/strong>Irregular plastic collection time<\/h4>\n<p>Similar to section 2.1; error occurs due to inappropriate design<\/p>\n<h4><strong>2.4.<\/strong> Plastic adheres to the screw causing black marks on the product<\/h4>\n<p>Caused by design and surface finishing technology. The design has resin retention points that lead to carbonization and cause defects.<\/p>\n<p>Because the plastic has high adhesion, the screw surface is not smooth enough, so the plastic sticks to it a lot, causing carbonization.<\/p>\n<p>\u279c Change the design so that there is no part that causes resin retention, choose the appropriate surface finishing method.<\/p>\n<h4><strong>2.5.<\/strong> Raise \/ Lower shaft diameter<\/h4>\n<p>Does changing the diameter involve changing the type of plastic used? If the type of plastic is not changed, the design remains the same, only the diameter is changed accordingly. If the type of plastic with different properties is changed, the entire design needs to be changed.<\/p>\n<p>Note that changing the shaft diameter must still meet the original assembly size (some cases will use an intermediate flange)<\/p>\n<p>For a better understanding of the case of lifting and lowering the barrel, please refer to the article on lifting and lowering the screw barrel in the related article below.<\/p>\n<h3><strong>Step 3: <\/strong>Design a new screw to meet the given requirements<\/h3>\n<h4><strong>3.1.<\/strong> Parameters related to the screw helix<\/h4>\n<h4>.<\/h4>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-3-1024x290.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-3-1024x290.png 1024w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-3-300x85.png 300w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-3-768x218.png 768w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-3.png 1119w\" alt=\"\" width=\"1024\" height=\"290\" \/><\/p>\n<p>\u2013 L\/D ratio (Length of the helix divided by diameter), this ratio is from 14 to 26 depending on the type of plastic. The ratio of 20.5 is a relatively common ratio.<\/p>\n<p>\u2013 Ratio between the helix parts. Length between the plastic intake part; compression part; quantitative part, this ratio also depends on the plastic codes<\/p>\n<p>\u2013 Compression ratio = (Outer diameter \u2013 inner diameter of the feeding area) \/ ((Outer diameter \u2013 inner diameter of the measuring part). This ratio is between 2 and 4, commonly 2.5<\/p>\n<p>\u2013 Plastic volume for 1 twist: This parameter is related to the load that the screw shaft must withstand and is also related to the shaft feeding speed.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-4.png\" sizes=\"(max-width: 856px) 100vw, 856px\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-4.png 856w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-4-300x278.png 300w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-4-768x711.png 768w\" alt=\"\" width=\"856\" height=\"792\" \/><\/p>\n<h4><strong>3.2.<\/strong> Double twist and starfruit twist<\/h4>\n<p>Double twist is often designed in the quantitative area when the plastic is completely in liquid form, the mixing effect here will be maximized<\/p>\n<p>The starfruit twist will be at the head of the shaft, usually 2 opposite spirals<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-5-1024x249.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-5-1024x249.png 1024w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-5-300x73.png 300w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-5-768x187.png 768w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-5.png 1125w\" alt=\"\" width=\"1024\" height=\"249\" \/><\/p>\n<h4><strong>3.3<\/strong> Screw shaft shank<\/h4>\n<p>The shank will change little because it must ensure the ability to assemble and transmit. The most changes are when lowering the screw shaft diameter because at that time the assembly part should not be made like the original shaft because if so, the shank will be larger The diameter of the helix makes it impossible to remove the screw for maintenance in the usual way (remove the adapter and pull the shaft out) but must remove the entire cylinder and then remove the screw from behind the cylinder.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-6.png\" sizes=\"(max-width: 313px) 100vw, 313px\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-6.png 313w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/11\/anh-6-279x300.png 279w\" alt=\"\" width=\"313\" height=\"337\" \/><\/p>\n<p><strong>ASG Vietnam Engineering Company Limited<\/strong> is a unit specializing in handling plastic injection problems with more than 10 years of experience. We are always ready to listen to your questions 24\/7 according to Hotline <strong>0917.54.88.11<\/strong><\/p>\n<h2><\/h2>\n<h2>Update the latest news in plastic injection industry:<\/h2>\n<h2><a href=\"https:\/\/asg.vn\/en\/tin-tuc\/\">see more<\/a><\/h2>\n<h4><\/h4>\n<h2>Message us now:<\/h2>\n<h2><a href=\"https:\/\/asg.vn\/en\/lien-he\/\">Send Message<br \/>\n<\/a><br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/07\/closeup-business-woman-hand-typing-laptop-keyboard-with-m-min-scaled.jpg\" sizes=\"(max-width: 2560px) 100vw, 2560px\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/07\/closeup-business-woman-hand-typing-laptop-keyboard-with-m-min-scaled.jpg 2560w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/07\/closeup-business-woman-hand-typing-laptop-keyboard-with-m-min-300x200.jpg 300w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/07\/closeup-business-woman-hand-typing-laptop-keyboard-with-m-min-1024x683.jpg 1024w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/07\/closeup-business-woman-hand-typing-laptop-keyboard-with-m-min-768x512.jpg 768w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/07\/closeup-business-woman-hand-typing-laptop-keyboard-with-m-min-1536x1025.jpg 1536w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/07\/closeup-business-woman-hand-typing-laptop-keyboard-with-m-min-2048x1366.jpg 2048w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/07\/closeup-business-woman-hand-typing-laptop-keyboard-with-m-min-930x620.jpg 930w\" alt=\"C\u00f4ng ty TNHH ASG Vi\u1ec7t Nam chuy\u00ean b\u00e1n xi lanh tr\u1ee5c v\u00edt m\u00e1y \u00e9p nh\u1ef1a\" width=\"2560\" height=\"1708\" \/><\/h2>","protected":false},"excerpt":{"rendered":"<p>Ph\u01b0\u01a1ng ph\u00e1p thi\u1ebft k\u1ebf tr\u1ee5c v\u00edt m\u00e1y \u00e9p nh\u1ef1a theo y\u00eau c\u1ea7u<\/p>","protected":false},"author":24,"featured_media":3673,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - 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