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TECHNICAL INFORMATION HDPE BLOW MOLDING GRADE ASRENE UB5206H Prepared by: Teguh Prasetio Approved by: Bayu Herlambang Rev.00 (20 Jan. 2011) PT. CHANDRA ASRI PETROCHEMICAL. Tbk INDONESIA 2011 HDPE Blow Molding Technical Info Asrene UB5206H Introduction Blow Molding is a process of inflating a hot, hollow, thermoplastic preform or parison inside a closed mold so its shape conforms to that of the mold cavity. In the process phase of blow molding, the molten tube is extruded at high pressure and rate through a small die gap and tube thus formed is free hanging in the mold. A wide variety of hollow parts, including plastic bottles, can be produced from many different plastics using this process. Most commodity grade and engineering grade resins may be blow molded, but the most common one is polyethylene, which is used for food, chemical or detergent bottles for instance.Then among of the different types of polyethylene, high density polyethylene (HDPE) is primarily used for blow molding. Generally, a distinction is made between small-part (≤ 5 liters) and large-part (> 5 liters) blow molded articles. Typical small-part blow molded articles are bottles, household and industrial containers while typical large-part blow molded articles are drums, jerrycans, tanks and others bulk containers. Low viscosity at high zero-shear is preferred to enhance extrusion, while high viscosity is preferred to resist sagging in the mold. This combination can be achieved by using broader Molecular Weight Distribution (MWD) resin of relatively high molecular weight. Asrene UB5206H as will be described later has excellent processability,good strength (such as good bottle drop resistance & bottle stacking) and good ESCR then suitable for large-part blow molding application. Technical Department – PT Chandra Asri – Indonesia 1. HDPE Blow Molding Technical Info Asrene UB5206H Asrene HDPE Blow Molding Asrene UB5206H is HDPE Large-Part Blow Molding grade which is produced by PT Chandra Asri (Indonesia) with FI (21.6) = 9.0 gr/min and Density = 0.953 gr/cm3. 1. Characteristic of Asrene UB5206H Asrene UB5206H is produced by using UNIPOL Fluidized Bed Gas Phase Process Technology. By using this technology, its offer relatively high molecular weight with broader MWD (Molecular Weight Distribution) that gives good processability and good strength (good bottle drop resistance and ESCR). Asrene UB5206H uses hexene (C6) as copolymer and its give good physical properties. 2. Regulation Compliance Asrene UB5206H complies with : 1. FDA regulation 21 CFR 177.1520 for food contact application 2. RoHS (Restriction of Hazardous Subtances) referring to EU Directive 2002/95/EC REACH Status With respect to REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) referring to EU Directive 1907/2006/EC: • The polymer like Asrene UB5206H is exempted from the provision as mentioned in article 2(9) • We assure that level of monomer substance(s) or other substance(s) in the form of monomeric units is less than 2% weight by weight (w/w) so that in such as reason Asrene UB5206H is not obligated to register to the agency as expressed in article 6(3) 3. Application → Large-Part Blow molding ( > 5L) → General sized containers (up to 100L) → Drums and industrial parts → Chemical containers Technical Department – PT Chandra Asri – Indonesia 2. HDPE Blow Molding Technical Info Asrene UB5206H 4. Physical Properties of Asrene UB5206H Item Test Method* Unit Value FI (190ºC/21.6 kg) ASTM D1238 g/10 min 9.0 MI (190ºC/2.16 kg) ASTM D1238 g/10 min 0.07 Density ASTM D1505 g/cm3 0.953 Vicat softening temperature ASTM D1525 ºC 130 Brittleness temperature ASTM D746 ºC < -70 ESCR (F50) ASTM D1693 Hrs > 500 Tensile strength @ yield ASTM D638 MPa 30 Elongation @break ASTM D638 % 840 Tensile impact strength ASTM D1822 kJ/m2 360 Flexural modulus ASTM D790 MPa 1,200 *Polyethylene tested per ASTM D1928 5. Processing Asrene UB5206H can be processed in general extrusion blow molding. Recommended processing condition : Melt Temperature : 190 - 220ºC Typical Processing Guidelines: Technical Department – PT Chandra Asri – Indonesia 3. HDPE Blow Molding Technical Info Asrene UB5206H 6. Trouble Shooting HDPE BLOW MOLDING TROUBLE SHOOTING No PROBLEM POSSIBLE CAUSES COUNTER MEASURE 1 DIE LINES 1. Die deposit in die lips a. Clean die lips. b. Increase die temp 2. Damaged die tooling a. Replace with the good one 3. Foreign material lodged in die gap a. clean die gap and remove that material 4. Low temperature a. Increase temperature setting b. Check barrel heater 5. Over heat temperature a. Reduce temperature setting 2 Black spot 1. Degradated resin a. if happen after start-up, do sufficient purging b. if use regrind material, remove that material c. if use pigment, change with other lot or one d. check resin appearance pellet 2. Resin performance a. Change with new one 3 Gel 1. Degradated resin a. if happen after start-up, do sufficient purging b. remove regrind material 2. High molecular weight component a. increase temperature setting b. reduce machine output 3. Poor pigment dispersion a. if use powder pigment change with color masterbatch 4. Poor resin performance a. change with new one 4 Yellowish 1. Overheat machine temperature a. Reduce machine temperature 2. Poor color resin a. Check resin color originally b. Change with new one c. Mix with the good one 3. Excessive regrind material a. Reduce the content or remove it 5 Poor ESCR 1. Poor bottle thickness distribution a. check bottle thickness distribution 2. Improper bottle design a. Eliminate sharp corner b. Eliminate thick section which cool slower than rest of bottle 3. Density resin too high a. Change with lower density resin 4. Machine & mold temperature too high a. Reduce that temperature 6 Excessive Shrinkage 1. Density resin too high a. Change with lower density b. Reduce pigment or color masterbatch content c. Reduce regrind material content 2. Insufficient mold cooling a. Check mold cooling 3. Cooling cycle too short a. Increase blowing time 4. Blowing air realeased too soon a. Increase blowing time 5. Blowing air pressure too low a. Increase blowing air pressure 7 Bottle Odor 1. Hot air trap inside bottle a. Do air flushing into bottle after bottle released from mold 2. Excessive regrind material a. Reduce or remove regrind material 3. Poor resin odor a. Check resin odor and change with new one 4. Overheat machine temperature a. Reduce machine temperature 5. Poor pigment or color masterbatch odor a. Check it odor and change with new one 8 Gloss Bottle 1. Machine & mold temperature too high a. Reduce that temperature 2. Flow Index resin too high a. Change with lower flow index 9 Unmelt Contamination 1. Contamination a. Change resin with other bag or lot b. Check resin appearance c. Place resin with difference melting point in separate place 2. poor regrind material performance a. Reduce or remove that material 10 Unstable Parison Flow 1. Unstable machine temperature a. Check temperature heater 2. Material a. Check resin for contamination with low or high Melt Index b. Change resin with new one c. Reduce or eliminate regrind material Technical Department – PT Chandra Asri – Indonesia 4. HDPE Blow Molding Technical Info Asrene UB5206H 7. Supporting Document 7.1. Material Safety Datasheet (MSDS) UB5206H..………………. (Attachment-1) 7.2. UB5206H FDA Compliance..…………………………………. (Attachment-2) 7.3. RoHS Certificate…………………………………….………… (Attachment-3) 7.4. SNI Compliance………………………………………………. (Attachment-4) Technical Department – PT Chandra Asri – Indonesia 5. HDPE Blow Molding Technical Info Asrene UB5206H Attachment-1 Technical Department – PT Chandra Asri – Indonesia 6. HDPE Blow Molding Technical Info Asrene UB5206H Technical Department – PT Chandra Asri – Indonesia 7. HDPE Blow Molding Technical Info Asrene UB5206H Technical Department – PT Chandra Asri – Indonesia 8 HDPE Blow Molding Technical Info Asrene UB5206H Technical Department – PT Chandra Asri – Indonesia 9. HDPE Blow Molding Technical Info Asrene UB5206H Attachment-2 Technical Department – PT Chandra Asri – Indonesia 10. HDPE Blow Molding Technical Info Asrene UB5206H Attachment-3 Technical Department – PT Chandra Asri – Indonesia 11. HDPE Blow Molding Technical Info Asrene UB5206H Technical Department – PT Chandra Asri – Indonesia 12.
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