{"id":938,"date":"2023-03-10T16:22:34","date_gmt":"2023-03-10T09:22:34","guid":{"rendered":"https:\/\/asg.vn\/?p=938"},"modified":"2023-03-13T10:05:29","modified_gmt":"2023-03-13T03:05:29","slug":"danh-sach-loi-hay-gap-trong-qua-trinh-duc-nhua-va-phuong-phap-cai-tien-p1bavia","status":"publish","type":"post","link":"https:\/\/asg.vn\/en\/danh-sach-loi-hay-gap-trong-qua-trinh-duc-nhua-va-phuong-phap-cai-tien-p1bavia\/","title":{"rendered":"List of common errors in plastic molding and improvement methods (P1:BAVIA)"},"content":{"rendered":"<p><\/p>\n\n\n<p><\/p>\n\n\n<p><\/p>\n\n\n<p><\/p>\n\t\t\n\t\t\t<h5>\n\t\t\t\tTable of contents\t\t\t<\/h5>\n\t\t\t<h1>BAVIA ERRORS IN PLASTIC MASTERS<\/h1>\t\t\n\t\t\t<h3>1.DEFINITION<\/h3>\t\t\n\t\t<p style=\"text-align: left;\">\u00a0 \u00a0 \u00a0Molds for engineering plastics have very high precision and meticulousness. The precision of the mold is at the micron level. And the mold is closed by high clamping pressure during injection molding. However, the mold opens slightly and creates a gap when the injection pressure is too high. Burrs arise when the plastic enters that gap. Burrs arise mainly at the PL line, slide core, vents, etc.<\/p>\n<p>\u00a0 \u00a0 \u00a0Bavia is a phenomenon in which plastic enters the middle of the parting surface (PL surface) of the mold and\u00a0 causes an unwanted thin film on the product. Burrs arise when the surface of the mold part opens under the influence of plastic pressure or when the PL surface has a gap in the middle.<\/p>\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t<figure>\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"813\" height=\"187\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/loi-duc-nhua-bavia-burr-flash-\u30d0\u30ea.png\" alt=\"l\u1ed7i \u0111\u00fac nh\u1ef1a bavia - burr - flash - \u30d0\u30ea\" loading=\"lazy\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/loi-duc-nhua-bavia-burr-flash-\u30d0\u30ea.png 813w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/loi-duc-nhua-bavia-burr-flash-\u30d0\u30ea-300x69.png 300w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/loi-duc-nhua-bavia-burr-flash-\u30d0\u30ea-768x177.png 768w\" sizes=\"(max-width: 813px) 100vw, 813px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption>Photo 1: Burr error on 120*120 plate<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t<p>\u00a0 \u00a0 \u00a0When reading the description of Bavia as an accent wall that causes the plastic to touch the dividing line, it may be a bit difficult for the reader to relate. But when you associate it with the leftover nail powder in Taiyaki cake (Photo 2), it will be easy to imagine Dinh lines. With Taiyaki, it is a profit, but with plastic molded products, it will be an NG product<\/p>\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t<figure>\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"490\" height=\"367\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/ay4328_jyusijikenbo06_fig02_w490.jpg\" alt=\"l\u1ed7i bavia s\u1ea3n ph\u1ea9m nh\u1ef1a\" loading=\"lazy\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/ay4328_jyusijikenbo06_fig02_w490.jpg 490w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/ay4328_jyusijikenbo06_fig02_w490-300x225.jpg 300w\" sizes=\"(max-width: 490px) 100vw, 490px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption>Photo 2: The excess edge of the Taiyaki cake looks like a defective product with burrs.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t<h2>2. Cause of bavia error<\/h2>\t\t\n\t\t\t<h3>2.1. Resin application is too high<\/h3>\t\t\n\t\t<p>\u00a0 \u00a0 \u00a0When the plastic pressure is too high, the mold opens and causes burrs. On the other hand, mold clamping force that is too small also causes burrs. Factors that create high plastic pressure include:<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2013 Injection speed is too high<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2013 Injection pressure is too high<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2013 Holding pressure is too high<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2013 V-P position transition is too slow<br \/>\u00a0 \u00a0 \u00a0In general, when product\u00a0surface appearance is highly required, the holding\u00a0pressure is very likely to be pushed\u00a0too high, especially to fix\u00a0dents, it is often set\u00a0higher than the standard. The\u00a0result is burrs.<\/p>\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t<figure>\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"358\" height=\"204\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/nguyen-nhan-gay-loi-bavia-do-ap-luc-nhua-cao..png\" alt=\"nguy\u00ean nh\u00e2n g\u00e2y l\u1ed7i bavia do \u00e1p l\u1ef1c nh\u1ef1a cao.\" loading=\"lazy\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/nguyen-nhan-gay-loi-bavia-do-ap-luc-nhua-cao..png 358w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/nguyen-nhan-gay-loi-bavia-do-ap-luc-nhua-cao.-300x171.png 300w\" sizes=\"(max-width: 358px) 100vw, 358px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption>Photo 3: Bavia caused by too high plastic pressure<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t<h3>2.2. The plastic flow is too high<\/h3>\t\t\n\t\t<p>\u00a0 \u00a0 \u00a0As the flowability of the plastic increases, the tendency for the plastic to enter the gap increases causing larger burrs. In general, as the resin temperature and mold temperature increase, the likelihood of burr defects becomes greater, and as the temperature decreases, the likelihood of burr defects becomes smaller.<\/p>\t\t\n\t\t\t<h3>2.3. Gap between mold parting surface\n<\/h3>\t\t\n\t\t<p>\u00a0 \u00a0 \u00a0Even for two-piece molds, when a defect is formed on the mold due to a mistake during injection molding or the like, burrs are sometimes generated at the defect site. When the core slide is used, special attention should be paid to the gap between the slide surfaces. Although the mold is made of steel and the mold clamping pressure is very large, the plastic pressure is also very large. Therefore, most molds are deformed during the forming process. In particular, mold deformation is evident in large injection molded products, where the presence of Pillar Support affects the formation of burrs (The absence of a Pillar causes larger deformation, larger gap, thus causing larger burrs.<\/p>\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t<figure>\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"666\" height=\"312\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/Anh-chup-Man-hinh-2022-03-08-luc-14_27_32.png\" alt=\"Bavia do khe h\u1edf gi\u1eefa b\u1ec1 m\u1eb7t khu\u00f4n\" loading=\"lazy\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/Anh-chup-Man-hinh-2022-03-08-luc-14_27_32.png 666w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/Anh-chup-Man-hinh-2022-03-08-luc-14_27_32-300x141.png 300w\" sizes=\"(max-width: 666px) 100vw, 666px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption>Photo 4: Burrs due to gaps between mold surfaces<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t<h3>2.4. For the case of PPS plastic\n<\/h3>\t\t\n\t\t<p>\u00a0 \u00a0 \u00a0PPS plastic has the disadvantage of easily forming burrs as the plastic's characteristics of high flowability with low displacement range. Therefore, when using PPS plastic, more attention should be paid to solutions to overcome burrs than other plastics. Mold accuracy is also required at a more stringent level than other plastics.<\/p>\t\t\n\t\t\t<h2>3. Anti-burr solution<\/h2>\t\t\n\t\t\t<h3>3.1. Reduce injection pressure<\/h3>\t\t\n\t\t<p>\u00a0 \u00a0 \u00a0The following methods are used to reduce the plastic pressure:<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2013 Reduce spray speed<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2013 Lower injection pressure<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2013 Lower holding pressure<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2013 Create V-P transitions earlier.<\/p>\t\t\n\t\t\t<h3>3.2. Check mold clamping force<\/h3>\t\t\n\t\t<p>\u00a0 \u00a0 \u00a0Check if there are any errors in the installation conditions. This is a very important step.<\/p>\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t<figure>\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"908\" height=\"472\" src=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/kiem-tra-luc-kep-khuon.png\" alt=\"ki\u1ec3m tra l\u1ef1c k\u1eb9p khu\u00f4n\" loading=\"lazy\" srcset=\"https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/kiem-tra-luc-kep-khuon.png 908w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/kiem-tra-luc-kep-khuon-300x156.png 300w, https:\/\/asg.vn\/wp-content\/uploads\/2023\/03\/kiem-tra-luc-kep-khuon-768x399.png 768w\" sizes=\"(max-width: 908px) 100vw, 908px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption>Photo 5: Check the mold to avoid errors<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t<h3>3.3. Accelerate the solidification process of plastic<\/h3>\t\t\n\t\t<p>\u00a0 \u00a0 \u00a0Bavia are prevented by accelerating the solidification of the resin, such as reducing the Nozzle temperature or the mold temperature. (Both methods can be done simultaneously)<\/p>\t\t\n\t\t\t<h3>3.4. Facial analysis test<\/h3>\t\t\n\t\t<p>\u00a0 \u00a0 \u00a0Check whether there is any gap or defect in the parting surface. The actual deformation degree of the mold can be determined by the dial gauge. When the deformation is too large, the repair of the mold structure should be considered. In large injection molding products, the installation of a Support Pillar should be considered.<\/p>\t\t\n\t\t\t<h3>3.5. For PPS plastic<\/h3>\t\t\n\t\t<p>\u00a0 \u00a0 \u00a0For PPS, you may encounter a wide plastic sheet at the thin part such as gas vent. The maximum thickness for gas vent is around 10\u03bcm. Please increase the number of gas vents. The accuracy of Slide core and Ejector Pin is required to be higher than other plastics.<\/p>\t\t\n\t\t\t<p>Related Articles <\/p>","protected":false},"excerpt":{"rendered":"<p>L\u1ed7i bavia trong \u0111\u00fac nh\u1ef1a, kh\u00e1i ni\u1ec7m, nguy\u00ean nh\u00e2n v\u00e0 ph\u01b0\u01a1ng ph\u00e1p c\u1ea3i ti\u1ebfn.<\/p>","protected":false},"author":24,"featured_media":994,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[31],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Danh s\u00e1ch l\u1ed7i hay g\u1eb7p trong qu\u00e1 tr\u00ecnh \u0111\u00fac nh\u1ef1a v\u00e0 ph\u01b0\u01a1ng ph\u00e1p c\u1ea3i ti\u1ebfn (P1:BAVIA)<\/title>\n<meta name=\"description\" content=\"Danh s\u00e1ch l\u1ed7i hay g\u1eb7p trong qu\u00e1 tr\u00ecnh \u0111\u00fac nh\u1ef1a v\u00e0 ph\u01b0\u01a1ng ph\u00e1p c\u1ea3i ti\u1ebfn. 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