{"id":3734,"date":"2026-09-30T15:55:19","date_gmt":"2026-09-30T07:55:19","guid":{"rendered":"http:\/\/0"},"modified":"2026-09-22T17:59:10","modified_gmt":"2026-09-22T09:59:10","slug":"flow-marks-injection-molding-causes","status":"publish","type":"post","link":"https:\/\/www.jcinjectionmolding.com\/ko\/blog\/flow-marks-injection-molding-causes\/","title":{"rendered":"\uacf5\uc815 \ubcc0\uacbd \ud6c4 \ud50c\ub85c\uc6b0 \ub9c8\ud06c\uac00 \ub2e4\uc2dc \ub098\ud0c0\ub098\ub294 \uc774\uc720\ub294 \ubb34\uc5c7\uc778\uac00\uc694?"},"content":{"rendered":"
\n

\uc0ac\ucd9c \uc131\ud615\uc5d0\uc11c \ud50c\ub85c\uc6b0 \ub9c8\ud06c\ub294 \uacf5\uc815 \ubcc0\uacbd\uc774 \uba54\ucee4\ub2c8\uc998\uc744 \uc81c\uac70\ud558\uc9c0 \uc54a\uace0 \uac00\uc2dc\uc801\uc778 \uc120\ub9cc \uc774\ub3d9\uc2dc\ud0a4\uae30 \ub54c\ubb38\uc5d0 \uc885\uc885 \ub2e4\uc2dc \ub098\ud0c0\ub0a9\ub2c8\ub2e4. \uc774 \ub9c8\ud06c\ub294 \ucf5c\ub4dc \ud50c\ub85c\uc6b0 \ud504\ub860\ud2b8, \ud5e4\uc9c0\ud14c\uc774\uc158, \uac8c\uc774\ud2b8 \uc81c\ud305, \ubd88\uc548\uc815\ud55c \uc18d\ub3c4, \ub450\uaed8 \uc804\ud658 \ub610\ub294 \ud45c\uba74 \ubcf5\uc81c \ucc28\uc774\ub97c \uae30\ub85d\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub97c \uc601\uad6c\uc801\uc73c\ub85c \uad50\uc815\ud558\ub824\uba74 \uc628\ub3c4\ub098 \uc18d\ub3c4\ub97c \ubcc0\uacbd\ud558\uae30 \uc804\uc5d0 \ub9c8\ud06c\ub97c \ucda9\uc804 \uc704\uce58 \ubc0f \ud615\uc0c1\uacfc \uc5f0\uad00\uc2dc\ud0a4\uc2ed\uc2dc\uc624.<\/p>\n

\n

\uac00\uc7a5 \ube60\ub974\uace0 \uc720\uc6a9\ud55c \ud14c\uc2a4\ud2b8:<\/strong> \uc20f\uc0f7 \uc2dc\ud000\uc2a4\ub97c \ub9cc\ub4e4\uace0 \uc9c4\ud589\ud558\ub294 \ud50c\ub85c\uc6b0 \ud504\ub860\ud2b8 \uc704\uc5d0 \uac00\uc2dc\uc801\uc778 \ub9c8\ud06c\ub97c \uacb9\uccd0 \ubcf4\uc2ed\uc2dc\uc624. \ub9c8\ud06c\uac00 \ud5e4\uc9c0\ud14c\uc774\uc158\uc774\ub098 \uc7ac\uac00\uc18d \uc9c0\uc810\uc744 \ub530\ub77c\uac04\ub2e4\uba74, \ubd80\ud488 \ud615\uc0c1\uacfc \uc18d\ub3c4 \ud504\ub85c\ud30c\uc77c\uc774 \uc774\ubbf8 \uc5b4\ub514\ub97c \uc870\uc0ac\ud574\uc57c \ud558\ub294\uc9c0 \uc54c\ub824\uc8fc\uace0 \uc788\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<\/div>\n

\uc774 \uae00\uc5d0\uc11c:<\/strong><\/p>\n

    \n
  1. \ub9c8\ud06c \uacc4\uc5f4 \uc2dd\ubcc4<\/a><\/li>\n
  2. \uae30\ud558\ud559\uc801 \ud2b8\ub9ac\uac70 \ucc3e\uae30<\/a><\/li>\n
  3. \ud50c\ub85c\uc6b0 \ud504\ub860\ud2b8 \uc548\uc815\ud654<\/a><\/li>\n
  4. \ud45c\uba74 \ubc0f \uc5f4\uc801 \ubcf5\uc81c \ud655\uc778<\/a><\/li>\n
  5. \uacf5\uc815 \uc708\ub3c4\uc6b0 \uc804\ubc18\uc5d0 \uac78\uccd0 \uac80\uc99d<\/a><\/li>\n
  6. \uc790\uc8fc \ubb3b\ub294 \uc9c8\ubb38<\/a><\/li>\n<\/ol>\n

    \ud45c\uba74\uc758 \ubaa8\ub4e0 \uc120\uc774 \uac19\uc740 \uacb0\ud568\uc740 \uc544\ub2d9\ub2c8\ub2e4<\/h2>\n

    \"flow-mark-after-wall-thickness-transition\"<\/p>\n

    \uac8c\uc774\ud2b8 \uadfc\ucc98\uc758 \ubc18\ubcf5\uc801\uc778 \ud30c\ud615\uc740 \uc81c\ud305\uc774\ub098 \ubd88\uc548\uc815\ud55c \ucd08\uae30 \ud750\ub984\uc744 \ub098\ud0c0\ub0bc \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub9ac\ube0c\ub098 \uae09\uaca9\ud55c \ud655\uc7a5 \uc774\ud6c4\uc758 \uc120\uc740 \ud5e4\uc9c0\ud14c\uc774\uc158\uc744 \uae30\ub85d\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ubb34\uad11\uc5d0\uc11c \uad11\ud0dd\uc73c\ub85c\uc758 \uacbd\uacc4\ub294 \ud45c\uba74 \uc811\ucd09\uc774\ub098 \ud50c\ub85c\uc6b0 \ud504\ub860\ud2b8 \uc628\ub3c4\uc758 \ubcc0\ud654\uc5d0\uc11c \ube44\ub86f\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc6f0\ub4dc \ub77c\uc778\uc740 \ud504\ub860\ud2b8\uac00 \ub9cc\ub098\ub294 \uacf3\uc5d0\uc11c \ud615\uc131\ub418\uba70 \ub2e4\ub978 \uad50\uc815 \uacbd\ub85c\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n

    \ubd80\ud488\uc758 \uc591\uba74\uc744 \uac80\uc0ac\ud558\uace0 \uce90\ube44\ud2f0\ub97c \ube44\uad50\ud558\uc2ed\uc2dc\uc624. \uc120\uc774 \uc735\uae30\ub418\uc5c8\ub294\uc9c0, \ud568\ubab0\ub418\uc5c8\ub294\uc9c0, \uad11\ud0dd\uc774 \ub2e4\ub978\uc9c0, \ub610\ub294 \ud2b9\uc815 \uc870\uba85\uc5d0\uc11c\ub9cc \ubcf4\uc774\ub294\uc9c0 \uae30\ub85d\ud558\uc2ed\uc2dc\uc624. \ud22c\uba85 \ubd80\ud488\uc758 \uacbd\uc6b0 \ud22c\uacfc\uad11\uc73c\ub85c\ub3c4 \uad00\ucc30\ud558\uc2ed\uc2dc\uc624. \ubbf8\uc138\ud55c \ud45c\uba74\uc774\ub098 \ubc30\ud5a5 \ubcc0\ud654\uac00 \uc678\uad00\uc0c1\ubcf4\ub2e4 \uad11\ud559\uc801\uc73c\ub85c \ub354 \uac15\ud558\uac8c \ub098\ud0c0\ub0a0 \uc218 \uc788\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/p>\n

    \ub9c8\ud06c\ub294 \uc885\uc885 \ud750\ub984\uc774 \uc6b4\ub3d9\ub7c9\uc744 \uc783\ub294 \uacf3\uc5d0\uc11c \uc2dc\uc791\ub429\ub2c8\ub2e4<\/h2>\n

    \uae09\uaca9\ud55c \ub450\uaed8 \ubcc0\ud654, \uc587\uc740 \uacf3\uc5d0\uc11c \ub450\uaebc\uc6b4 \uacf3\uc73c\ub85c\uc758 \uc804\ud658, \ub9ac\ube0c, \ubcf4\uc2a4 \ubc0f \ud070 \uac1c\ubc29 \uc601\uc5ed\uc740 \uad6d\ubd80 \uc18d\ub3c4\uc640 \ub0c9\uac01\uc744 \ubcc0\ud654\uc2dc\ud0b5\ub2c8\ub2e4. \uc6a9\uc735\uccb4\ub294 \ub2e4\ub978 \uc601\uc5ed\uc774 \ucda9\uc804\ub418\ub294 \ub3d9\uc548 \uc587\uc740 \ubd84\uae30\uc5d0\uc11c \ud5e4\uc9c0\ud14c\uc774\uc158\ud558\ub2e4\uac00 \ub354 \ucc28\uac00\uc6b4 \uc2a4\ud0a8\uc73c\ub85c \uc7ac\uc2dc\uc791\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8 \uc7ac\uc2dc\uc791\uc740 \uacbd\uacc4\ub85c \uac00\uc2dc\uc801\uc73c\ub85c \ub0a8\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

    \uae30\ub2a5\uc774 \ud5c8\uc6a9\ud558\ub294 \uacf3\uc5d0\uc11c\ub294 \uc804\ud658\ubd80\ub97c \ub465\uae00\uac8c \ud558\uace0, \ubcbd \ub450\uaed8 \ubcc0\ud654\ub97c \uc810\uc9c4\uc801\uc73c\ub85c \uc720\uc9c0\ud558\uba70, \ubcbd \uc811\ucd09 \uc5c6\uc774 \uac1c\ubc29 \uacf5\uac04\uc73c\ub85c \uc0ac\ucd9c\ub418\ub294 \uac8c\uc774\ud2b8\ub97c \ud53c\ud558\uc2ed\uc2dc\uc624. \uac8c\uc774\ud2b8 \uc704\uce58 \ubcc0\uacbd\uc740 \ud55c \ud45c\uba74\uc744 \uac1c\uc120\ud558\ub294 \ub3d9\uc2dc\uc5d0 \uc6f0\ub4dc \ub77c\uc778\uc744 \uad11\ud559 \uacbd\ub85c\ub85c \uc774\ub3d9\uc2dc\ud0ac \uc218 \uc788\uc73c\ubbc0\ub85c \uc804\uccb4 \ucda9\uc804 \ud328\ud134\uc744 \ud3c9\uac00\ud558\uc2ed\uc2dc\uc624.<\/p>\n

    Control Velocity at the Defect Location, Not Only at the Machine<\/h2>\n

    \"polished-cavity-surface-under-inspection-light\"<\/p>\n

    Machine screw speed is not the same as flow-front velocity. As the cavity\u2019s projected flow area changes, the front can accelerate or slow even at a constant programmed speed. Use staged filling based on screw position and short-shot evidence to manage the critical transition.<\/p>\n

    Melt and mold temperature influence how long the surface remains able to replicate the steel. Raising them may improve a cold mark, but it also changes cycle, shrinkage and degradation risk. Confirm actual melt and mold conditions and stay within the resin supplier\u2019s processing window.<\/p>\n

    Surface Finish Can Reveal a Thermal Boundary<\/h2>\n

    A polished optical face shows small differences in replication. Uneven mold temperature, contamination, vent deposits or local steel texture can make a flow boundary visible. Clean and inspect the cavity before building a complex process correction around a damaged surface.<\/p>\n

    Venting matters at the region where air is compressed. Restricted vents can change surface contact or create burns and deposits. A vent correction should be confirmed for flash risk across the allowed pressure window.<\/p>\n

    A Cosmetic Fix Must Survive Normal Variation<\/h2>\n

    \"flow-mark-validation-across-process-window\"<\/p>\n

    Once the mark improves, test the solution across realistic material lots, cavities, mold temperatures and cycle interruptions. Track the same lighting and viewing standard. A setting that hides the mark only at one high temperature is not robust production control.<\/p>\n

    For \uad11\ud559 \ubc0f \ud22c\uba85 \uc0ac\ucd9c \uc131\ud615<\/a>, add transmitted-light or functional checks where the part guides, images or distributes light. A visually acceptable boundary can still alter the optical path.<\/p>\n\n\n\n\n\n\n\n
    Evidence<\/th>\nFirst hypothesis<\/th>\nNext check<\/th>\n<\/tr>\n<\/thead>\n
    Waves immediately after gate<\/td>\nJetting or unstable entry<\/td>\n\uac8c\uc774\ud2b8 \ubc29\ud5a5 \ubc0f \ucd08\uae30 \uc18d\ub3c4<\/td>\n<\/tr>\n
    \ub450\uaed8 \ubcc0\uacbd \ud6c4 \ub77c\uc778<\/td>\n\uc9c0\uc5f0 \ub610\ub294 \uc7ac\uac00\uc18d<\/td>\n\uc20f \uc0f7 \ubc0f \ub2e8\uacc4\ubcc4 \ucda9\uc804<\/td>\n<\/tr>\n
    1\uce90\ube44\ud2f0 \uad11\ud0dd \uacbd\uacc4<\/td>\n\uad6d\ubd80\uc801 \ud45c\uba74 \ub610\ub294 \uc628\ub3c4 \ubb38\uc81c<\/td>\n\uce90\ube44\ud2f0, \ubca4\ud2b8 \ubc0f \ub0c9\uac01 \uc810\uac80<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \ucd5c\uc801\ud654\ub85c \uc5c6\uc560\uae30 \uc804\uc5d0 \uac00\uc2dc\uc131\ubd80\ud130 \uc815\uc758\ud558\uc2ed\uc2dc\uc624<\/h3>\n

    \uad11\uc6d0, \uac01\ub3c4, \ubc30\uacbd, \uad00\ucc30 \uac70\ub9ac \ubc0f \uac80\uc0ac \uad6c\uc5ed\uc5d0 \ud569\uc758\ud558\uc2ed\uc2dc\uc624. \ud655\uc0b0 \uc2e4\ub0b4 \uc870\uba85\uc5d0\uc11c\ub294 \ubcf4\uc774\uc9c0 \uc54a\ub294 \ub77c\uc778\ub3c4 \ub300\uc2dc\ubcf4\ub4dc \ubc31\ub77c\uc774\ud2b8\ub098 \ud587\ube5b \uc544\ub798\uc5d0\uc11c\ub294 \ub69c\ub837\ud558\uac8c \ubcf4\uc77c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc548\uc815\uc801\uc778 \uac80\uc0ac \uc870\uac74\uc740 \uacf5\uc815\uc774 \ud2b9\uc815\uc778\uc758 \uad00\ucc30 \uac01\ub3c4\uc5d0 \ub9de\ucdb0 \uc870\uc815\ub418\ub294 \uac83\uc744 \ubc29\uc9c0\ud569\ub2c8\ub2e4.<\/p>\n

    \ubd80\ud488\uc744 \ubb38\uc81c \ud574\uacb0\uc744 \uc704\ud574 \ubcf4\ub0bc \ub54c\ub294 \uc20f \uc0f7, \ubbf8\ud2b8\ub9bc \uc0d8\ud50c, \uce90\ube44\ud2f0 \uc2dd\ubcc4 \uc815\ubcf4, \uac8c\uc774\ud2b8 \ubc0f \ubcbd \ub450\uaed8 \uc815\ubcf4, \uc218\uc9c0 \ub4f1\uae09, \uadf8\ub9ac\uace0 \uc591\ud638\ud55c \uae30\uac04\uacfc \ubd88\ub7c9 \uae30\uac04\uc758 \uc124\uc815\uac12\uc744 \ud3ec\ud568\ud558\uc2ed\uc2dc\uc624. \uc774\ub7ec\ud55c \uae30\uac04 \uac04\uc758 \ub300\ube44\ub294 \ub2e8\uc77c \uae30\uc900 \uc124\uc815 \uc2dc\ud2b8\ubcf4\ub2e4 \uc885\uc885 \ub354 \uc720\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n

    \uacac\uace0\ud55c \uad50\uc815\uacfc \uc678\uad00\uc0c1\uc758 \uac00\ub9bc\uc744 \uad6c\ubd84\ud558\uc2ed\uc2dc\uc624<\/h3>\n

    \ud14d\uc2a4\ucc98, \ucf54\ud305 \ub610\ub294 \ucc29\uc0c9\uc740 \uac00\uc2dc\uc131\uc744 \uc904\uc77c \uc218 \uc788\uc9c0\ub9cc, \uc774\ub294 \uc720\ub3d9 \ubd88\uc548\uc815\uc131\uc744 \uac00\ub9b4 \ubfd0\uc77c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8 \uc790\uad6d\uc774 \uc751\ub825, \uc57d\ud55c \uc6a9\ucc29 \ub610\ub294 \ubd88\ub7c9\ud55c \uc804\uc0ac\ub3c4 \ub098\ud0c0\ub0b8\ub2e4\uba74, \uc774\ub97c \uc228\uaca8\ub3c4 \uae30\ub2a5 \ubb38\uc81c\ub294 \ud574\uacb0\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc678\uad00\uc0c1\uc758 2\ucc28 \uc791\uc5c5\uc744 \uc601\uad6c\uc801\uc778 \ud574\uacb0\ucc45\uc73c\ub85c \ubc1b\uc544\ub4e4\uc774\uae30 \uc804\uc5d0 \uce58\uc218 \ubc0f \uae30\uacc4\uc801 \uacb0\uacfc\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/p>\n

    \uacac\uace0\ud55c \uad50\uc815\uc740 \uc2dc\ub3d9, \uc815\uc0c1 \uc0dd\uc0b0, \uadf8\ub9ac\uace0 \uc218\uc9c0 \ub85c\ud2b8, \uae08\ud615 \uc628\ub3c4 \ubc0f \uc0ac\uc774\ud074\uc758 \uc608\uc0c1 \ubcc0\ub3d9 \uc804\ubc18\uc5d0 \uac78\uccd0 \ud6a8\uacfc\ub97c \uc720\uc9c0\ud574\uc57c \ud569\ub2c8\ub2e4. \uc20f \uc0f7 \uc99d\uac70\uc640 \ubcc0\uacbd\ub41c \uba54\ucee4\ub2c8\uc998\uc744 \ubb38\uc11c\ud654\ud558\uc2ed\uc2dc\uc624. \uadf8 \uae30\ub85d\uc740 \ud5a5\ud6c4 \uae30\uc220\uc790\uac00 \ubb34\uc791\uc704 \uc870\uc815\uc744 \ubc18\ubcf5\ud558\uc9c0 \uc54a\uace0 \uacf5\uc815\uc744 \ubcf5\uad6c\ud558\ub294 \ub370 \ub3c4\uc6c0\uc774 \ub429\ub2c8\ub2e4.<\/p>\n

    \uc790\uc8fc \ubb3b\ub294 \uc9c8\ubb38<\/h2>\n

    \"molding-team-tracing-recurring-flow-marks\"<\/p>\n

    \ub354 \ube60\ub978 \uc0ac\ucd9c\uc774 \ud56d\uc0c1 \uc720\ub3d9 \uc790\uad6d\uc744 \uc81c\uac70\ud569\ub2c8\uae4c?<\/h3>\n

    \uc544\ub2c8\uc694. \uc720\ub3d9 \uc120\ub2e8\uc744 \ub354 \ub728\uac81\uac8c \uc720\uc9c0\ud560 \uc218\ub294 \uc788\uc9c0\ub9cc, \uc81c\ud305, \uc804\ub2e8 \ub610\ub294 \uac07\ud78c \uac00\uc2a4\ub97c \uc720\ubc1c\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4. \uc18d\ub3c4\ub97c \uacb0\ud568 \uc704\uce58\uc5d0 \ub9de\ucd94\uc2ed\uc2dc\uc624.<\/p>\n

    Can polishing the mold remove the mark?<\/h3>\n

    Only if surface condition is the cause. Polishing does not correct hesitation, gate jetting or an unstable thermal boundary and can change optical form.<\/p>\n

    Why does the mark return after maintenance?<\/h3>\n

    Cleaning, reassembly, cooling connection, vent condition or hot-runner balance may have changed. Compare cavity and process records before and after the event.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

    Flow marks in injection molding often return because a process change moves the visible line without removing the mechanism. The mark may record a cold flow front, hesitation, gate jetting, unstable velocity, thickness transition or surface replication difference. To correct it permanently, relate the mark to fill position and geometry before changing temperature or speed. […]<\/p>\n","protected":false},"author":1,"featured_media":3816,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3734","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/posts\/3734","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/comments?post=3734"}],"version-history":[{"count":0,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/posts\/3734\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/media\/3816"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/media?parent=3734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/categories?post=3734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/tags?post=3734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}