{"id":1358,"date":"2025-05-23T14:14:16","date_gmt":"2025-05-23T06:14:16","guid":{"rendered":"https:\/\/old.jbrplas.com\/?p=1358"},"modified":"2025-05-23T14:14:18","modified_gmt":"2025-05-23T06:14:18","slug":"basics-of-plastic-mold-knowledge","status":"publish","type":"post","link":"https:\/\/old.jbrplas.com\/ru\/basics-of-plastic-mold-knowledge\/","title":{"rendered":"Basics of Plastic Mold Knowledge"},"content":{"rendered":"<h4 class=\"wp-block-heading\" id=\"i-definition-of-mold\"><strong>I. Definition of Mold<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Mold<\/strong>: A tool that shapes materials into products with specific dimensions. It determines manufacturing quality and cost, serving as the core tool for mass production, often referred to as the &#8220;Mother of Products.&#8221;<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"ii-overview-of-plastic-injection-molds\"><strong>II. Overview of Plastic Injection Molds<\/strong><\/h4>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Working Principle<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Injection Process<\/strong>: Clamping \u2192 Plasticizing (feeding, decompression) \u2192 Injection (filling, packing) \u2192 Cooling \u2192 Ejection.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Development Trends<\/strong>\n<ul class=\"wp-block-list\">\n<li>Larger molds, higher precision requirements, multi-functional composite molds.<\/li>\n\n\n\n<li>Increased use of hot runner systems, standardization of components, and advanced technological integration.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"iii-classification-and-applications-of-plastic-molds\"><strong>III. Classification and Applications of Plastic Molds<\/strong><\/h4>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Two-Plate Mold<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Structure<\/strong>: Direct separation of male and female molds. Suitable for single-cavity direct gates or multi-cavity edge gates.<\/li>\n\n\n\n<li><strong>Applications<\/strong>: Simple products, e.g., parts with single-point gates.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Three-Plate Mold<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Structure<\/strong>: Adds a runner plate for automatic gate separation. Suitable for multi-point gates (pin-point gates).<\/li>\n\n\n\n<li><strong>Applications<\/strong>: Complex products requiring automatic gate cutting.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Two-and-a-Half-Plate Mold<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Features<\/strong>: Heated runner system to maintain molten plastic, reducing waste and injection pressure.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Hot Runner System<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Advantages<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Shortens cycle time, improves efficiency;<\/li>\n\n\n\n<li>Reduces material waste;<\/li>\n\n\n\n<li>Lowers injection pressure, enhances product quality.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Components<\/strong>: Hot nozzles, manifold, temperature controller, valve gate sequencer.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<div class=\"wp-block-greenshift-blocks-image gspb_image gspb_image-id-gsbp-7e44e40\" id=\"gspb_image-id-gsbp-7e44e40\"><img decoding=\"async\" src=\"https:\/\/old.jbrplas.com\/wp-content\/uploads\/2025\/05\/mold.webp\" data-src=\"\" alt=\"\" loading=\"lazy\" width=\"543\" height=\"651\"\/><\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"iv-key-components-functions-and-layout\"><strong>IV. Key Components: Functions and Layout<\/strong><\/h4>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Guide Pins (G.P.)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Function<\/strong>: Ensure precise alignment of male and female molds to prevent core damage.<\/li>\n\n\n\n<li><strong>Placement<\/strong>: Symmetrically at four corners; guide bushings on the female mold, pins on the male mold; includes vent slots.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Ejector Guide Pins (E.G.P)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Function<\/strong>: Guide movement of ejector plates.<\/li>\n\n\n\n<li><strong>Quantity<\/strong>: Typically 4 (2 for small molds), placed near Return Pins (R.P.).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Support Pillars (S.P.)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Function<\/strong>: Reinforce male mold plate strength, prevent ejector plate deformation.<\/li>\n\n\n\n<li><strong>Placement<\/strong>: Near high-pressure injection zones, avoiding interference with other components.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Stopper Pins (STP)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Function<\/strong>: Align injection nozzle with sprue bushing, reducing setup time.<\/li>\n\n\n\n<li><strong>Specifications<\/strong>: Diameter \u03a6100 (small molds) to \u03a6150 (large molds), with tolerance (-0.10\/-0.30 mm).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Locating Ring &amp; Sprue Bushing<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Locating Ring<\/strong>: Ensures nozzle alignment with mold runner.<\/li>\n\n\n\n<li><strong>Sprue Bushing<\/strong>: Heat-treated for wear resistance; runners require draft angles.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Small Pull Rods &amp; Mold Locks<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Small Pull Rods<\/strong>: Utilize nylon friction for locking, suitable for low-volume or low-temperature molds.<\/li>\n\n\n\n<li><strong>Mold Locks<\/strong>: Includes resin-type (high durability) and mechanical types for large or precision molds.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"v-injection-machine-selection-and-guidelines\"><strong>V. Injection Machine Selection and Guidelines<\/strong><\/h4>\n\n\n\n<div class=\"wp-block-greenshift-blocks-image gspb_image gspb_image-id-gsbp-21fb5c2\" id=\"gspb_image-id-gsbp-21fb5c2\"><img decoding=\"async\" src=\"https:\/\/old.jbrplas.com\/wp-content\/uploads\/2025\/05\/injection-molding-1.gif\" data-src=\"\" alt=\"\" loading=\"lazy\" width=\"556\" height=\"208\"\/><\/div>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Clamping Force Calculation<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Formula<\/strong>: Clamping&nbsp;Force&nbsp;(T) = 330\u2009kg\/cm2 \u00d7 Product&nbsp;Length&nbsp;(cm) \u00d7 Product&nbsp;Width&nbsp;(cm) \u00d7 1.5 \/ 1000<\/li>\n\n\n\n<li><strong>Selection<\/strong>: Machine tonnage must exceed calculated value; ensure compatibility with mold thickness and tie-bar spacing.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Knockout (KO) Holes &amp; Lifting Holes<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>KO Holes<\/strong>: Must align with sprue bushing; no positional deviation allowed.<\/li>\n\n\n\n<li><strong>Lifting Holes<\/strong>: Sized based on mold weight; large molds require holes on all sides.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"vi-additional-notes\"><strong>VI. Additional Notes<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Maintenance<\/strong>: Regularly inspect wear on guide pins, ejector pins, etc.<\/li>\n\n\n\n<li><strong>Hot Runner Control<\/strong>: Strict temperature monitoring to prevent clogging or material degradation.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>I. Definition of Mold II. Overview of Plastic Injection Molds III. Classification and Applications of Plastic Molds IV. Key Components: Functions and Layout V. Injection Machine Selection and Guidelines VI. Additional Notes<\/p>","protected":false},"author":1,"featured_media":1364,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"#gspb_image-id-gsbp-21fb5c2,#gspb_image-id-gsbp-7e44e40{text-align:center}#gspb_image-id-gsbp-21fb5c2 img,#gspb_image-id-gsbp-7e44e40 img{vertical-align:top;display:inline-block;box-sizing:border-box;max-width:100%;height:auto}","footnotes":""},"categories":[19],"tags":[],"class_list":["post-1358","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"blocksy_meta":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/posts\/1358","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/comments?post=1358"}],"version-history":[{"count":3,"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/posts\/1358\/revisions"}],"predecessor-version":[{"id":1365,"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/posts\/1358\/revisions\/1365"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/media\/1364"}],"wp:attachment":[{"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/media?parent=1358"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/categories?post=1358"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/old.jbrplas.com\/ru\/wp-json\/wp\/v2\/tags?post=1358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}