IGN & OPERATIONBASIC MOLD DES TYPE OF MOLDS FLOW OF MELT CAVITY MELT NUMBER OF CAVITIES CLAMPING FORCE

TYPES OF MOLDS TWO PLATE MOLD THREE PLATE MOLD COLD RUNNER HOT RUNNER etc.

“B” SERIES TWO PLATE MOLD ONLY ONE PARTING LINE NOT SUITABLE FOR AUTOMATE OPERATION LESS EXPENSIVE THAN “A” SERIES

“T” SERIES THREE PLATE MOLD CORE CAVITY STRIPPER

SHUTTLE MOLDS B-MOVING DIRECTION

STACK MOLDS MULTI CAVITIES MOLD REQUIRE LESS CLAMPING FORCE TYICALLY USED FOR HOT RUNNER

MOLD ACTION FOR “A” SERIES

MOLD ACTION FOR “B” SERIES

MOLD ACTION FOR “T” SERIES

MOLD ACTION FOR SHUTTLE MOLDS

MOLD ACTION FOR STACK MOLDS

MOLD ACTION FOR “AX” SERIES

MOLD TYPES AND ACTION QUIZ 1. WHICH ITEM IS THE "B" PLATE IN THE DIAGRAM?

MOLD TYPES AND ACTION QUIZ 3. WHICH OF THE FOLLOWING MOLD SERIES IS SHOWN IN THE DIAGRAM? (a) B SERIES (b) A SERIES (c) T SERIES

FLOW OF PLASTIC MELT SPRUE: TAPERED ROUND AND HAS UNDERCUT (PULLER) IS USED FOR PASSAGEWAY OF MELT FROM NOZZLE TO RUNNER RUNNER: USED FOR PASSAGEWAY OF MELT FROM SPRUE TO GATE GATE :RESTICTED PASSAGEWAY USED FOR OF MELT TRAVEL FROM RUNNER TO MOLD CAVITY COLD SLUGE WELL: USED TO RECEIVE AND PREVENT COOL MATERIAL TO ENTER THE RUNNER. IT IS ABOUT 1 TO 1.5 TIME THE DIMATER IN DEPTH.

FLOW OF PLASTIC MELT NOTE:AIR CAN BE RELEASED THROUGH VENT AND EJECTOR.

RUNNER SYSTEMS “ BALANCED H RUNNER PATTERN ” (SECONDARY) TERTIARY RUNNER (PRIMARY)

HOT RUNNER SYSTEMS INTERNAL HEATEDEXTERNAL HEATED

HOT RUNNER SYSTEMS

RUNNER TYPES FULL ROUND RUNNER TRAPEZOIDAL RUNNER

ROUND RUNNER LEAST FRICTION LEAST PRESSURE DROP BEST FLOW EASIEST TO EJECT DIFFICULT TO MATCH BOTH HALF OF THE MOLD LARGER RUNNER REDUCE STRESS,  = 3/16” – 3/8” WARPING AND SINK MARK. HOWEVER INCREASE SHOT SIZE (WASTE OF MATERIALS).

TRAPERZOIDAL RUNNER EASIEST TO MACHINE GREAT FLOW RESTRICTION NORMALLY USED IN THREE PLATE MOLD OR MOLD DOES NOT ALLOW ROUND RUNNER

RUNNER SYSTEMS

BASIC RUNNER CALCULATION

BALANCED RUNNER LAYOUT

UNBALANCED RUNNER LAYOUT

BRANCHED RUNNER EACH TIME A RUNNER IS BRANCHED, THE DIAMETER OF THE BRANCH RUNNERS SHOULD BE SMALLER THAN THE MAIN RUNNER, BECAUSE LESS MATERIAL FLOWS THROUGH THE BRANCHES AND IT IS ECONOMICALLY DESIRABLE TO USE MINIMUM MATERIAL IN THE RUNNERS. WHERE N IS THE NUMBER OF BRANCHES, THE RELATIONSHIP BETWEEN THE MAIN RUNNER DIAMETER (D MAIN ) AND THE BRANCH RUNNER DIAMETER (D BRANCH ) IS; D MAIN = D BRANCH X N 1/3

INTERMITTION QUIZ 1. THE FOLLOWING RUNNER SYSTEM IS UNBALANCED H PATTERN. BALANCING THE SYSTEM BY USING THE APPROXIMATE EQUATION; 55 g 60 g 3.0 cm 1.0 cm

BALANCING RUNNER 1.THE FOLLOWING RUNNER SYSTEM IS UNBALANCED. BALANCING THE SYSTEM BY USING THE APPROXIMATE EQUATION;

INTERMITTION QUIZ 2. WHICH OF THE FOLLOWING IS CONSIDERED THE BEST RUNNER SHAPE? (a) A ROUND RUNNER SHAPE. (b) A TRAPEZOIDAL RUNNER SHAPE. (c) A HALF-ROUND SHAPE. 3. THE MAIN PURPOSE OF BALANCING A MULTI-CAVITY MOLD IS TO: (a)SAVE PLASTIC RESIN DURING THE MOLDING CYCLE (b) TAKE THE MOST DIRECT PATH FROM THE SPRUE TO THE GATE. (c) FILL ALL CAVITIES SIMULTANEOUSLY, CONTINUOUSLY, AND UNIFORMLY.

INTERMITTION QUIZ (a)RESTRICT THE PLASTIC FLOW IN A RUNNER SYSTEM. (b) SHORTEN THE LENGTH OF THE RUNNER SYSTEM. (c) TRAP THE LEADING COOLED PLASTIC TRAVELING THROUGH THE RUNNER PATHS. 4. THE MAIN PURPOSE OF COLD SLUG WELLS ARE TO: (a)BALANCING THE RUNNER SYSTEM BY INCREASING THE RUNNER LENGTH. (b) REMOVING THE COLD SLUG WELLS TO SHORTEN THE RUNNER LENGTH. (c) INCREASING THE RUNNER DIAMETER OR VENTING OF THE MOLD BASE. 5. DURING THE TRYOUT OF A MOLD IT IS DISCOVERED THAT NONE OF THE 4 CAVITIES FILL COMPLETELY. IF IT ISN'T THE MOLDER'S FAULT, WHAT IS A POSSIBLE SOLUTION TO THE PROBLEM?