{"id":14925,"date":"2026-06-09T02:51:24","date_gmt":"2026-06-09T02:51:24","guid":{"rendered":"https:\/\/www.air-classifier-mill.com\/?p=14925"},"modified":"2026-06-09T02:51:26","modified_gmt":"2026-06-09T02:51:26","slug":"acm-grinder-vs-pin-mill-which-offers-better-psd-control","status":"publish","type":"post","link":"https:\/\/www.air-classifier-mill.com\/vi\/acm-grinder-vs-pin-mill-which-offers-better-psd-control\/","title":{"rendered":"M\u00e1y m\u00e0i ACM so v\u1edbi m\u00e1y phay ch\u1ed1t: Lo\u1ea1i n\u00e0o ki\u1ec3m so\u00e1t PSD t\u1ed1t h\u01a1n?"},"content":{"rendered":"<p>In industrial powder processing, particle size distribution (PSD) is one of the most important indicators of product quality. Precise PSD control is essential for the ultrafine grinding of lithium battery cathode and anode materials, as well as non-metallic minerals. It is equally important in the dry enrichment of plant proteins and food processing applications. A narrow and uniform particle size distribution can significantly enhance the performance, consistency, and value of the final product. Among the many types of ultrafine grinding equipment, the ACM grinder (<a href=\"https:\/\/www.air-classifier-mill.com\/vi\/\">Nh\u00e0 m\u00e1y ph\u00e2n lo\u1ea1i kh\u00f4ng kh\u00ed<\/a> ) and the Pin Mill are the two main models frequently mentioned and compared. So, which of these mills is superior in terms of particle size distribution control?<\/p><figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"533\" src=\"https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/ACM-grinder-VS-Pin-Mill.webp\" alt=\"So s\u00e1nh m\u00e1y m\u00e0i ACM v\u00e0 m\u00e1y phay ch\u1ed1t.\" class=\"wp-image-14926\" srcset=\"https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/ACM-grinder-VS-Pin-Mill.webp 800w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/ACM-grinder-VS-Pin-Mill-300x200.webp 300w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/ACM-grinder-VS-Pin-Mill-768x512.webp 768w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/ACM-grinder-VS-Pin-Mill-18x12.webp 18w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/ACM-grinder-VS-Pin-Mill-600x400.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><h2 class=\"wp-block-heading\">Working Principle: How Are Crushing and Material Control Achieved?<\/h2><p>To understand the differences between the two in terms of particle size control, we must first analyze their fundamental differences in material crushing and screening mechanisms.<\/p><h3 class=\"wp-block-heading\">ACM Grinder<\/h3><p>M\u1ed8T <a href=\"https:\/\/www.air-classifier-mill.com\/vi\/danh-muc-san-pham\/air-classifier-mill\/\">nh\u00e0 m\u00e1y ph\u00e2n lo\u1ea1i kh\u00f4ng kh\u00ed<\/a> (such as the MJW series) is a highly efficient crushing device that integrates mechanical impact crushing with built-in centrifugal air classification.<\/p><ul class=\"wp-block-list\"><li><strong>Grinding Mechanism:<\/strong> The material is ground through intense impact, shearing, and collision between the high-speed rotating hammers or blades and the toothed ring.<\/li>\n\n<li><strong>Control Mechanism:<\/strong> The blower draws the crushed material into the built-in air classification wheel located at the top of the mill. The airflow then carries the qualified fine powder through the classification wheel and transports it to the collection system. Meanwhile, the classification wheel rejects the unqualified coarse particles and returns them to the crushing zone for further grinding.<\/li><\/ul><h3 class=\"wp-block-heading\">Pin Mill<\/h3><p>The pin mill is a mechanical mill that relies purely on high-speed relative motion to achieve impact crushing.<\/p><ul class=\"wp-block-list\"><li><strong>Grinding Mechanism:<\/strong> It typically consists of two counter-rotating pin discs (one stationary and one rotating, or both rotating). Each disc surface features multiple rings of steel pins arranged in an interlaced pattern. Material is fed into the center and moves toward the periphery under the action of centrifugal force. It undergoes intense, high-frequency impact and shearing between the high-speed, interlaced steel pins.<\/li>\n\n<li><strong>Control Mechanism:<\/strong> The pin mill does not have a built-in dynamic classification system. The final particle size primarily depends on the rotational speed of the discs, the density of the pins, the feed rate, and the material\u2019s inherent brittleness. A screen is usually installed around the discharge port to intercept coarse particles, but this is a passive interception method.<\/li><\/ul><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/10\/air-classifier-mill-\uff08ACM\uff09.webp\" alt=\"m\u00e1y nghi\u1ec1n ph\u00e2n lo\u1ea1i kh\u00f4ng kh\u00ed (ACM)\" class=\"wp-image-14640\" srcset=\"https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/10\/air-classifier-mill-\uff08ACM\uff09.webp 800w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/10\/air-classifier-mill-\uff08ACM\uff09-300x225.webp 300w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/10\/air-classifier-mill-\uff08ACM\uff09-768x576.webp 768w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/10\/air-classifier-mill-\uff08ACM\uff09-16x12.webp 16w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/10\/air-classifier-mill-\uff08ACM\uff09-600x450.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">m\u00e1y nghi\u1ec1n ph\u00e2n lo\u1ea1i kh\u00f4ng kh\u00ed (ACM)<\/figcaption><\/figure><h2 class=\"wp-block-heading\">In-Depth Comparison of Particle Size Distribution (PSD) Control<\/h2><p>The Air Classifier Mill (ACM) holds a clear advantage in terms of particle size distribution control. We can analyze the reasons behind this from the following key perspectives:<\/p><h3 class=\"wp-block-heading\">Control of Over-grinding<\/h3><ul class=\"wp-block-list\"><li><strong>ACM grinder: <\/strong>Thanks to its built-in air classification wheel, material is immediately carried away by the airflow once it reaches the target fineness. This prevents \u201cover-grinding.\u201d As a result, its particle size distribution curve is very narrow and concentrated, with large particles (D97 or D100) thoroughly cut off and a low proportion of ultrafine powder.<\/li>\n\n<li><strong>Pin Mill:<\/strong> The time material spends moving outward through the pin array is relatively fixed. Even if some material has already reached the desired fineness, it may continue to be impacted before being discharged from the mill. This results in a significant amount of secondary ultrafine particles (over-grinding). Consequently, the tail of the particle size distribution curve becomes elongated (increased ultrafine content).<\/li><\/ul><h3 class=\"wp-block-heading\">Flexibility and Precision of Adjustment<\/h3><ul class=\"wp-block-list\"><li><strong>ACM grinder : <\/strong>Adjusting particle size is extremely convenient. Users do not need to shut down the machine. They can precisely set the target particle size simply by adjusting the speed of the classifier wheel and the system airflow via a variable frequency drive. (For example, precisely controlling D50 to within a few micrometers.)<\/li>\n\n<li><strong>Pin Mill:<\/strong> To change the output particle size, it is usually necessary to adjust the rotational speed of the entire pin disc. If significant adjustments are required, it may even be necessary to shut down the machine to replace the pin disc with one featuring a different pin density or arrangement. Alternatively, the peripheral screen with a different mesh size may need to be replaced. The linearity and precision of adjustment are far inferior to those of the ACM.<\/li><\/ul><h3 class=\"wp-block-heading\">Effect of Temperature Rise on Particle Size<\/h3><ul class=\"wp-block-list\"><li><strong>ACM grinder : <\/strong>A high-volume airflow passes through the grinding chamber, carrying away the majority of the heat generated during grinding. Low-temperature operation not only preserves the material\u2019s properties, such as chemical and physical stability.<br>It also prevents fluctuations in particle size. These fluctuations can occur when the material softens or sticks to the chamber walls due to heat.<\/li>\n\n<li><strong>Pin Mill:<\/strong> Because of its compact design and the lack of high-volume airflow for heat dissipation, high-speed friction and impact generate significant heat. For heat-sensitive materials, such as thermoplastic resins, sugar, and high-fat materials, this temperature rise can easily lead to caking or melting. Such changes severely affect the stability of the particle size distribution.<\/li><\/ul><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/Pin-mill-MJL630-P.webp\" alt=\"Pin mill MJL630-P\" class=\"wp-image-14927\" srcset=\"https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/Pin-mill-MJL630-P.webp 800w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/Pin-mill-MJL630-P-300x225.webp 300w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/Pin-mill-MJL630-P-768x576.webp 768w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/Pin-mill-MJL630-P-16x12.webp 16w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2026\/06\/Pin-mill-MJL630-P-600x450.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><h2 class=\"wp-block-heading\">Application Scenarios and Selection Guide<\/h2><p>Although air-classifying mills offer superior control over particle size distribution, this does not mean that pin mills have no place in the industry. In actual production, the choice of equipment depends on the material properties and the technical specifications of the final product:<\/p><figure class=\"wp-block-table\"><table><thead><tr><td><strong>Dimension<\/strong><\/td><td><strong><a href=\"https:\/\/www.air-classifier-mill.com\/vi\/san-pham\/mjw-a-air-classifier-mill-2\/\">M\u00e1y nghi\u1ec1n ph\u00e2n lo\u1ea1i kh\u00f4ng kh\u00ed (ACM)<\/a><\/strong><\/td><td><strong>Pin Mill<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Particle Size Distribution (PSD)<\/strong><\/td><td>Highly narrow, precise control, sharp top-size cut-off<\/td><td>Relatively broad, prone to generating superfines<\/td><\/tr><tr><td><strong>Fineness Range<\/strong><\/td><td>Down to D97 = 5 ~\u00a015\u03bcm (Ultra-fine range)<\/td><td>Typically D97 = 45 ~\u00a0150\u03bcm (Medium-fine range)<\/td><\/tr><tr><td><strong>Typical Applications<\/strong><\/td><td>Lithium battery cathode\/anode materials, high-end non-metallic minerals (quartz, GCC), plant proteins (soy\/pea protein dry fractionation), chemical raw materials<\/td><td>Moderate-fat food products (cocoa, chemical intermediates), pharmaceuticals, coarse\/medium milling of oily or fibrous materials<\/td><\/tr><tr><td><strong>System Complexity<\/strong><\/td><td>High (requires classifier setup, pulse jet bag filter, fan)<\/td><td>Low (simple structure, small footprint, easy maintenance)<\/td><\/tr><tr><td><strong>Energy Consumption<\/strong><\/td><td>Higher specific energy consumption per ton, but delivers high-value products<\/td><td>Lower energy consumption per unit of output<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">Ph\u1ea7n k\u1ebft lu\u1eadn<\/h2><p>Which mill offers better control over particle size distribution?<\/p><p>The answer is undoubtedly the <a href=\"https:\/\/www.air-classifier-mill.com\/vi\/san-pham\/mjw-w-may-phan-loai-khong-khi-nha-may\/\">Nh\u00e0 m\u00e1y ph\u00e2n lo\u1ea1i kh\u00f4ng kh\u00ed<\/a>.<br>Its closed-loop dynamic control mechanism, which combines grinding and classification, effectively prevents over-grinding. It eliminates large particles from the product and enables precise online adjustment of particle size parameters during production. If your product (such as new materials for lithium batteries or ultrafine mineral powders) has extremely stringent requirements for D50 and D97 specifications, the Air Classifier Mill is the ideal process choice.<br>The Pin Mill, on the other hand, is better suited for applications where particle size distribution requirements are less stringent and the material itself is brittle. It is also suitable for conventional grinding scenarios requiring high cost-effectiveness and high throughput.<\/p><hr class=\"wp-block-separator has-css-opacity is-style-default\"\/><figure class=\"wp-block-image aligncenter size-full is-resized is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" width=\"721\" height=\"721\" src=\"https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/11\/Emily-Chen.webp\" alt=\"Emily Chen\" class=\"wp-image-14704\" style=\"width:150px;height:150px\" srcset=\"https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/11\/Emily-Chen.webp 721w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-300x300.webp 300w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-100x100.webp 100w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-12x12.webp 12w, https:\/\/www.air-classifier-mill.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-600x600.webp 600w\" sizes=\"(max-width: 721px) 100vw, 721px\" \/><\/figure><blockquote class=\"wp-block-quote has-text-align-center is-style-large is-layout-flow wp-block-quote-is-layout-flow\"><p>\u201cC\u1ea3m \u01a1n b\u1ea1n \u0111\u00e3 \u0111\u1ecdc. T\u00f4i hy v\u1ecdng b\u00e0i vi\u1ebft n\u00e0y h\u1eefu \u00edch. Vui l\u00f2ng \u0111\u1ec3 l\u1ea1i b\u00ecnh lu\u1eadn b\u00ean d\u01b0\u1edbi. B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 li\u00ean h\u1ec7 v\u1edbi \u0111\u1ea1i di\u1ec7n ch\u0103m s\u00f3c kh\u00e1ch h\u00e0ng tr\u1ef1c tuy\u1ebfn c\u1ee7a Zelda n\u1ebfu c\u00f3 b\u1ea5t k\u1ef3 th\u1eafc m\u1eafc n\u00e0o kh\u00e1c.\u201d<\/p><cite>                                                                                                                                                                           \u2014 \u0110\u01b0\u1ee3c \u0111\u0103ng b\u1edfi <a href=\"https:\/\/www.linkedin.com\/company\/76603359\/admin\/dashboard\/\">Emily Chen<\/a><\/cite><\/blockquote><hr class=\"wp-block-separator has-css-opacity is-style-default\"\/><div class=\"wp-block-contact-form-7-contact-form-selector\">\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f14015-o1\" lang=\"zh-CN\" dir=\"ltr\" data-wpcf7-id=\"14015\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form 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