Air Ring and Die Heads Expert

Q & A

Frequently asked questions

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1. LDPE / LLDPE B.U.R. = 2 ~ 3 ; HDPE B.U.R. = 6 ~ 8 2. B.U.R. Calculation = (Lay Flat Film Width (mm) x 2) ÷ (π) 3.1416 ÷ Die Lip Size (mm) Read More
Our air ring and die head will be designed and manufactured according to your specification and requirement. We need to know your sepcification of blown film extruder as under: Read More
Q1: Problem of air ring exits? A1: Check if Air Ring exits position has been moved away from the last setting up. See if its air flow is to be evenly delivered; find the correct position of lip-height with air pressure properly. (Air ring is designed with Venturi principle which is to make exit air to become a vacuum effect instead of interference by itself, for example, dual air flows. Generally when increasing air flow, the bubble will be sucked up with the wall and become stable; but the thin film might be touched with the wall and scratched. If any question, please consult with our technical service.) Q2: Ambient air flow interference? A2: Check and minimize the surrounding air flow of the ambient interference. Q3: Melt strength too low? A3: Lower the molten temperature; use lower MFI material; and increase LDPE level. Q4: Too high B.U.R.? A4. Increase die head size for suitable B.U.R. Q5: Too high output? A5: Lower output quantity. Q6: Extruder Surging? A6: See "Solution of Extruder Surging" below. Read More
Q1: Incorrect coupling between air ring and die head? A1: Check the position between air ring and die head to be at central line. Q2: Check if air flow from air ring exit not uniformly? A2: Check if air ring exit has been damaged, if any foreign material or dust got into air ring, air entrances to be uniformly distributed. Q3: Die head temperature uneven or unstable? A3: Check die head heater band, thermal couple, temperature indicator to be normally working. Q4: Material feeding unstable? A4: Check rotating speed and feeding area of screw or hopper of any material blockage; nipple roller evenly runs. Exchange filter of screen changer when polymer becomes blockage. Q5: B.U.R problem? A5: Check B.U.R, see if it is too large; or replace with larger die head lip size. Q6: Ambient air flow interference? A6: Stop outer air flow directly coming to working area. Apply ventilation system for air conditioning properly without affect extrusion blown film running. Read More
Q1: Frost line too high? A1: Lower height of the frost line. Q2: Molten temperature too low? A2: Increase temperature of extruder and die head. Q3: Happenings of melt fracture? A3: See "Solution of Melt Fracture". Q4: Too wide of die gap? A4: Exchange narrower gap of die pins. Q5: Formulation issue or additives problem such as too much of anti-block agent? A5: Add higher flow index and lower density polymer and optimize level of additive. Read More
Q1: Too high pressure of die head? A1: Check screen changer blockage, consider to add higher MI polymer, add up die size or gap size or add up extrusion temperature. Q2: Is bubble kept stable? A2: Follow the "Solution of Unstable Bubble" of above. Q3: What about the extruder motor runs? A3: Exchange the malfunction motor; or increase extruder temperature, use of higher MI Polymer. Read More
Q1: Too narrow of die gap? A1: Change larger gap die inserts. Q2: Melt temperature is too low? A2: Increase temperature of extruder and die head. Q3: Formulation issue? A3: Increase more (%) of wider molecular weight polymer(for ex. LDPE) rather than narrower one (for ex. LLDPE). Q4: Additives insufficient problem? A4: Increase additives for the processing requirement. Q5: Too high of output rate? A5: Lower down output rate. Q6: Die head material issue? A6: Choose a suitable material for die head which decreases molten slippage. Read More
Q1: Bubble cooling not enough? A1: Increase cooling air supply. Q2: Too high pressure of nip roller? A2: Release nip roller pressure. Q3: Too high of winding tension? A3: Lower down winding tension. Q4: Rollers exposed at high heat during standby or store A4: Keep the standby rollers away from high heat area. Q5: Is the anti-block level inadequate or improper type? A5: Add up anti-block level; or apply better type of agent. Q6: Polymer formulation issue? A6: Use of higher density polymer or Metallocene PE. Read More
Q1: Too high film thickness variation or gauge incorrect? A1: See "Solution of the blown film thickness variation too high"; follow the standard of B.U.R. as stated above. Q2: Too high of sealing temperature? A2: Decrease sealing temperature. Q3: Too high or too low sealing pressure? A3: Adjust sealing pressure properly; or optimize the choice of sealing knife. Q4: Sealing temperature or dwelling time are not enough? A4: Increase sealing temperature and dwelling time. Q5: Polymer formulation issue A5: Check again that the original polymer type, see if any incorrect blending. Q6: Too much corona treatment? A6: Decrease level of corona treatment at blown film plant. Read More
Q1: Too high of die head temperature? A1: Decrease temperature of die head. Q2: Too high of molten temperature? A2: Reduce temperature of the extruder. Q3: Die lips damaged or scraped? A3: Exchange or repair die lip sets. Q4: Misalignment of die lips? A4: Re-align die lips to be neat and correct position. Q5: Too much anti-block agent? A5: Check type of anti-block agent and its level properly. Read More
Q1: Extruder temperature setting not properly? A1: Readjust and set up properly of extruder temperatures. Q2: Material feeding zone blockage? A2: Check of hopper of feeding zone and expel the blockage. Q3: Material feeding throat cooling insufficient? A3: Make sure of the cooling water for feeding zone properly. Q4: Polymer blending not well done? A4: Check of material blending equipment to be working properly. Read More
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C.Y. Introduction

Chuo Yii Enterprise Co. is Taiwan supplier and manufacturer in Foundry Industry. C.Y. has been offering our customers high quality Dual Lips Air Ring, Low Gauge Variation Air Ring, HDPE / LDPE / LLDPE / MDPE / PP / PVC / PLA Air Ring, Mono-Layer & Multi-Layer (1 / 2 / 3 / 5 / 6 / 7 Layer) Die Heads, IBC System, Down-Stream Air Ring, PLA Die Head, Rotary Mechanism, Manual and Auto Screen Changer, Central Column & Stabilizing Ring, Heat Sealing Blade, Aluminum Sand Casting Foundry OEM since 2009. With both advanced technology and 20 years experience, C.Y. always make sure to meet each customer's demand.


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