`HDPE-‐A-‐01
`
`The Association of Post Consumer Plastic Recyclers (APR) recognizes that packaging innovation
`drives the growth of bottles available for recycling and that growth in the supply of these
`bottles is essential to the well being of the plastic bottle recycling industry. APR also recognizes
`that some innovations may create bottles that present technical challenges for recycling. This
`document represents a tool to help the innovator understand the approximate effect of the
`innovation on high density polyethylene (HDPE) plastic bottle recycling processes.
`
`The APR encourages Innovators to perform comprehensive recycle evaluation studies on new
`innovation materials intended to be introduced into the HDPE bottle stream. This Applications
`Guidance Document describes the protocols to be followed to evaluate the mechanical
`recyclability of the following Innovation materials that are intended to be made into or
`incorporated onto HDPE bottles:
`
`1. HDPE Resins
`2. Additives
`3. Coatings
`4. Labels
`5. Adhesives
`6. Multilayer resins
`
`In particular, a comprehensive recycling evaluation is accomplished by following a step-‐wise
`process involving the evaluations of the innovation using Testing Protocols that have been
`developed by APR. APR recognizes accomplishment and allows upon petition for the Innovator
`to publicize that they have completed each step. The steps include:
`
`STEP 1 1.00 CRITICAL GUIDANCE DOCUMENT
`1.10 Resins, Additives, Coatings, Labels, Adhesives and Multilayer Resins Evaluation
`Protocol, Critical Guidance
`
`STEP 2 2.00 APPLICATIONS GUIDANCE DOCUMENT
` 2.10 Bottle-‐To-‐Bottle Evaluation, (BtB)
`
`Upon the completion of all parts of STEP 2, meeting or exceeding all of the strictest guidance,
`APR would consider a petition for full Recycling Guidance Recognition.
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`Page 1 of 12
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`Champions for Change®
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`EPL LIMITED EX1014
`U.S. Patent No. 10,889,093
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`The screening tool referred to above in STEP 1 as the HDPE Critical Guidance document (CGD) is
`intended to help identify possible technical challenges that a new Innovation might create for
`the HDPE recycle stream. An Innovator is requested to first test an innovation material
`following the CDG before proceeding to STEP 2 and the more extensive Bottle-‐to-‐Bottle
`evaluation.
`
`When coupling the CGD screening protocol with a Bottle-‐to-‐End-‐Use evaluation, it is necessary
`to increase the quantity of the Control and Innovation materials used in the CGD protocol to
`produce sufficient material for making the final test bottles
`
`The guidance contained in this document does not include time as a variable. Innovations
`which include time as a factor will require additional considerations.
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`THIS DOCUMENT IS NOT A SPECIFICATION AND DOES NOT IMPLY IN ITS DEFINITIONS,
`PROCEDURES, OR VALUES FITNESS FOR USE, MARKET ACCEPTABILITY, SAFETY, OR ANY
`GUARANTEE OR WARRANTY. MEETING THESE GUIDELINES DOES NOT OBLIGATE APR
`MEMBERS TO BUY BOTTLES CONTAINING THE INNOVATION.
`
`
`Moreover, the inability of an innovation to meet specified values does not imply recycling
`failure, but should be a clear message that significant technical challenges might exist under
`certain circumstances and mitigation of the issue may be needed to avoid degrading the value
`of the stream of recyclable bottles.
`
`THE FOLLOWING PROTOCOLS DO NOT PURPORT TO ADDRESS ALL OF THE SAFETY ISSUES, IF
`ANY, ASSOCIATED WITH THEIR USE. IT IS THE RESPONSIBILITY OF THE USER TO ESTABLISH
`APPROPRIATE SAFETY AND HEALTH PRACTICES AND DETERMINE THE APPLICABILITY OF
`REGULATORY LIMITATIONS PRIOR TO USE.
`
`
`1.0 CRITICAL GUIDANCE DOCUMENT (CGD)
`Introduction
`The CGD is intended to be a screening tool that can be used by Innovators to gain a quick
`understanding on the impact of their innovation on the HDPE recycle stream before proceeding
`to the more extensive Bottle-‐to-‐Bottle Protocol and other end use protocols. While the CGD
`protocol is designed as a recycle screening protocol, the material that has been processed in
`the CGD study can then be used as the starting material to continue the recycle evaluation
`through a Bottle-‐to-‐Bottle study.
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`Page 2 of 12 Champions for Change®
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`Testing Procedures
`The procedures needed for performing the tests called for in the recycling protocols are listed
`below:
`• Color (ASTM D6290)
`• Melt Index (ASTM D1238)
`• Density (ASTM D1505, ASTMD792, or equivalent)
`• Melt filtration
`• % polypropylene in HDPE (ASTM D7399)
`
`
`Testing Protocols
`The detailed protocols to be followed are listed below and are described in detail in this
`document.
`
`
`• 1.10 Resin, Additives, Coatings, Labels, Adhesives, and Multilayer Resins, Critical
`Guidance
`
`
`Control Resins
`The virgin control resins that can be selected for use following the CGD are listed below. The
`Innovator is requested to select a Control resin based upon its intended end-‐use application.
`These resins are to be used to make both the Control flake and the Innovation bottle flake that
`will contain the additive, coating, label, adhesive or multilayer resin for the recycle study.
`
`
`Homo Polymer HDPE
`Chevron Phillips Marlex® EHM 6007
`Dow UNIVAL™ DMDH-‐6400 NT 7
`Exxon-‐Mobil Paxon™ HDPE AD60-‐007
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`Copolymer HDPE
`Chevron Phillips Marlex® HHM 5502BN
`Chevron Phillips Marlex® 9505H
`Dow UNIVAL™ DMDA-‐6230 NT 7
`Dow UNIVAL™ DMDA-‐6200 NT 7
`ExxonMobil Paxon™ HDPE AB50-‐003
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`Labels and Adhesives
`If the innovation does not involve labels or adhesives, and if it can be correctly argued that
`labels and adhesives have no impact on the innovation, the innovation samples can be made
`and processed without the presence of labels or adhesives.
`
`1.10 Resins, Additives, Coatings, Labels, Adhesives and Multilayer Resins Evaluation Protocol,
`CRITICAL GUIDANCE
`
`
`Background
`The control bottles required for this test must be made from one of the APR-‐named control
`resins. The bottles can be supplied from commercial sources or blown as a separate test set and
`do not have to be of any special design or size. The additive, coating, label, adhesive or
`multilayer resin to be evaluated should be incorporated into or onto bottles made using the
`same control resin.
`
`Resins, Additives, Coatings, Labels Adhesives, and Multilayer Resins Test Protocol
`For all extrusion and molding steps, the process should first be established on the Control resin
`and then used without changes for the innovation materials. Any required processing changes
`for the innovation material content samples should be documented and reported. It is
`recognized that minor process changes may be needed and these will not be considered
`significant when judging the innovation materials suitability for recycling.
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`Page 4 of 12 Champions for Change®
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`Resins, Additives, Coatings, Labels, Adhesives, and Multilayer Resins
`Evaluation Flow Schematic
`HDPE Resins, Additives, Coatings, Labels, Adhesives and Multilayer Resin Protocol
`GENERAL APPLICATIONS GUIDANCE
`
`
`
`Control Bottles
`
`Innovation Bottles
`
`Grind, Elutriate
`
`Grind, Elutriate
`
`Wash, sink/float, air dry, elutriate
`
`Wash, sink/float, air dry, elutriate
`
`Control Flakes A0
`
`Test Flakes I0
`
`Flake Blending
`
`Sample A1, a dry blend of
`100% Control Flakes, A0
`0% Innovation Flakes, I0
`Air dry, 24 hours, room temperature
`Measure volatiles
`
`Sample B1, a dry blend of
`75% Control Flakes, A0
`25% Innovation Flakes, I0
`Air dry, 24 hours, room temperature
`Measure volatiles. Compare to Sample A1
`
`Sample C1, a dry blend of
`50% Control Flakes, A0
`50% Innovation Flakes, I0
`Air dry, 24 hours, room temperature
`Measure volatiles, compare to A1
`
`Sample A2, pellets
`
`Sample B2, pellets
`
`Sample C2, pellets
`
`Melt filter and pelletize, measure pressure
`drop
`
`Melt filter and pelletize, measure pressure
`drop. Compare to Sample A2
`
`Melt filter and pelletize, measure pressure
`drop. Compare to Sample A2
`
`Measure Volatiles
`
`Measure Melt
`Index
`
`Measure Density
`
`Bottle-to-Bottle
`Sample Blends
`
`Sample D
`50% Sample A2
`50% Control
`pellets
`
`Bottle Blowing
`Sample D4
`
`Bottle Testing,
`Evaluation
`
`Measure Volatiles
`Compare to A2
`
`Measure Melt
`Index
`
`Measure Density
`Compare to A2
`
`Measure % PP
`
`Bottle-to-Bottle
`Sample Blends
`
`Sample E
`50% Sample B2
`50% Control
`pellets
`
`Bottle Blowing
`Sample E4
`
`Bottle Testing,
`Evaluation
`
`Measure Volatiles
`Compare to A2
`
`Measure Melt
`Index
`
`Measure Density
`Compare to A2
`
`Measure % PP
`
`Bottle-to-Bottle
`Sample Blends
`
`Sample F
`50% Sample C2
`50% Control
`pellets
`
`Bottle Blowing
`Sample F4
`
`Bottle Testing,
`Evaluation
`
`Prepare plaques, Sample
`A3, from pellet Sample
`A2 for Homopolymer
`only
`
`Prepare plaques, Sample
`B3, from pellet Sample
`B2 for Homopolymer
`only
`
`Prepare plaques, Sample
`C3, from pellet Sample
`C2 for Homopolymer
`only
`
`Measure Hunter
`Melt blend
`
`Sample D and L*,A*, B*
`test Sample
`test either pellet or
`G5 molding for
`plaque,
`Homopolymer only
`stress crack
`evaluation
`
`Measure Hunter
`Melt blend
`
`Sample E and L*,A*, B*
`test Sample
`test either pellet or
`H5 molding for
`plaque,
`Homopolymer only
`stress crack
`evaluation
`
`Measure Hunter
`Melt blend
`
`Sample F and L*,A*, B*
`test Sample J5
`test either pellet or
`molding for
`plaque,
`Homopolymer only
`stress crack
`evaluation
`
`
`
`
`Control and Innovation/Variant Bottle Manufacture
`1. Control bottles should be made from one of the named resins listed in the APR Bottle
`Recycle Evaluation Protocol. The Innovation bottles should be made with this same resin
`incorporating the resin, additive, coating or multilayer resin at the intended use level.
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`Page 5 of 12 Champions for Change®
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`Flake Preparation
`The Reclaim Processing Test Protocol is to include but is not limited to the following:
`1. The Control bottles and Innovation bottles should be dry-‐ground to nominal ¼” to ½”
`size flake.
`2. Air elutriate to remove light fractions with one pass and with less than 2% loss set for
`the Control Flake. (Note: This step may be eliminated if these samples are wet ground.
`If omitted, more innovation failures may occur.)
`3. Wash in highly agitated water at least 60° C for 10 to 15 minutes. Water may contain
`surfactants and have a pH of 12 to 13. Report wash solution composition.
`4. Specific gravity separation in water of materials with density greater than 1.0.
`5. Skim off and collect any material that is floating after the wash.
`6. Air-‐dry flakes with no heat or vacuum
`7. A second air elutriation to remove light fractions with one pass and with less than 2%
`loss set for the Control Flake may be carried out on the dried washed flake
`
`
`Extrude, including melt filtration, to produce product pellets as below.
`
`
`Sample Blending
`Washed flake from number 6 or 7 above will be used to make the required Samples.
`1. Prepare samples A0 and I0 above. Air dry A0 and I0 at room temperature for 24 hours,
`no vacuum or heat applied either as number 6 above or after number 7 above.
`2. Create the following three test blends from the washed flake for study:
`Sample A1:
` 100% Control Material, A0
` 0% Innovation Material, I0
`Sample B1:
`75% Control Material, A0
`25% Innovation Material, I0
`Sample C1:
`50% Control Material, A0
`50% Innovation Material, I0
`3. Measure volatiles on flakes. For 10 grams of air-‐dried flake Samples A1, B1, and C1
`exposed to 160°C for 10 minutes,
`
`
`
`
` Guidelines comparing Samples B1 and C1 to Control A1
`a. Less than 0.2% absolute difference after exposure for Samples B1 and C1
`compared to Sample A1. Use moisture analyzer for measurement.
`
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`Extrusion/Pelletization
`1. Dry samples A1, B1 and C1 at no more than 150 F for 10 minutes before extrusion.
`2. Extrude under conditions determined by the control sample, Sample A1, using a
`40/150/40 mesh screen pack.
`3. Pelletize each of the sample blends, giving each its second melt history. Make Sample A2
`from flake blend A1, Sample B2 from flake blend B1 and Sample C2 from flake blend C1.
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`Guidelines comparing Samples B2 and C2 to Control A2
`a. No more than 10% higher pressure required on extrusion of the Innovation
`Samples B2 and C2 compared to the Control Sample A2 after 30 minutes of
`extrusion.
`b. The extrusion rate should be at least 500 gm/cm2 per hour.
`c. No additional fuming, smoking or odors should be noticed when extruding the
`Innovation Samples compared to the Control.
`d. No build up on screen
`e. Resin pellets or flakes should not stick together during drying.
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`Pellet evaluation
`1. Measure volatiles on pellets after extrusion.
`For 10 grams of air-‐dried pellets Samples A2, B2, and C2 exposed to 160°C for 10
`minutes.
`Guidelines comparing Samples B2 and C2 to Control A2
`a. Less than 0.1% absolute difference after exposure for Samples B2 and C2
`compared to Sample A2. Use moisture analyzer for measurement.
`
`
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`2. Measure melt index for samples A2, B2, and C2
` Guidelines
`
`a. For copolymer HDPE, 0.2 to 0.7 gm/10 minutes, Samples A2, B2, and C2
`b. For homopolymer HDPE, 0.2 to 0.9 gm/10 minutes, Samples A2, B2, and C2
`
`
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`3. Measure density for samples A2, B2, and C2
`Guidelines
`a. For copolymer and homopolymer HDPE, Samples B2 and C2 are +/-‐ 0.010
`gm/cm3 compared to Sample A2. C2 always less than 0.995 gm/cm3.
`
`
`4. Measure percentage polypropylene for samples B2, and C2
`Guidelines
`a. For copolymer and homopolymer HDPE, Samples B2 and C2 are less than 2%
`polypropylene (total percent polypropylene in innovation bottles less than 4%).
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`
` Plaque Molding (natural homopolymer)
`1. Dry samples A2, B2, and C2 at no more than 150 F for 10 minutes before extrusion.
`2. Injection mold 3mm plaques from the control Sample A2 first. Then mold 3mm plaques
`from Samples B2 and C2 under identical conditions if possible to form plaque samples
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`A3, B3, and C3. If the processing conditions need to be changed, then these changes
`must be documented and reported.
`Guidelines comparing Samples B2 and C2 to Control A2 or comparing Samples B3
`and C3 to Control A3
`a. 3mm Plaque Color for Sample Plaques A3, B3 and C3 or Pellets A2, B2, and C2.
`i. For natural HDPE, L* should be >63 for Samples A3 and C3 or Samples A2
`and C2
`ii. a* greater than -‐4.5 for Samples A3 and C3 or Samples A2 and C2
`iii. b* less than 13 for Samples A3 and C3 or Samples A2 and C2
`NOTE: color can be measured on plaques or pellets
`
`NOTE: This completes the Critical Guidance Document requirements. If a Bottle-‐to-‐Bottle
`study is being performed, then continue with the following steps.
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`2.0 APPLICATIONS GUIDANCE
`2.10 Bottle-‐to-‐Bottle Protocol (BtB)
`
`The Bottle-‐to-‐Bottle evaluation program is designed to show processing and bottle
`performance differences between a control material and that control material containing
`recycle-‐content Innovation material. It is a generally comparative study that does not rely on
`the final blown bottles meeting absolute performance criteria other than minimums listed.
`
`Since the Bottle-‐to-‐Bottle program is designed to use a one quart generic monolayer motor oil
`bottle the optimal study will be one where the initial control resin selected for use in the
`Critical Guidance Document screening will be selected from the list of APR-‐named control HDPE
`resins. The Control homopolymer virgin resin called for in Step 1 below ideally would be
`identical to the Critical Guidance Document control resin. It is recognized that if the Innovation
`being studied in the Critical Guidance Document is a copolymer resin or an additive
`incorporated into a copolymer resin, it may not be ideal for motor oil bottle performance.
`However this non-‐base material can still be blended with a control (selected from the table
`above) to begin the Bottle-‐to-‐Bottle evaluation. When this is the case, it is important to
`recognize that the resulting control bottles and Innovation recycle-‐content bottles may not
`perform ideally in all of the tests. Since the bottle test performance of the Innovation recycle-‐
`content bottles will be compared to the control bottles, it will still be possible to judge the
`Innovation's compatibility for the recycle stream if the bottle test criteria are met. Because the
`non control materials are currently found in the recycle stream, it can be presumed then any
`new material similar to these that does not result in significant differences in recycle-‐content
`bottle performance are, therefore, also expected to be compatible.
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`1. Create the following test blends of Samples A2, B2 and C2 by blending each at 50% with
`the Control virgin resin pellets.
`Sample D: 50% Virgin HDPE control resin pellets + 50% Sample A2. (0% innovation)
`Sample E: 50% Virgin HDPE control resin pellets + 50% Sample B2. (12.5% innovation)
`Sample F: 50% Virgin HDPE control resin pellets + 50% Sample C2. (25% innovation)
`
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`Examination One: Blow Molding of Bottles
`The blends of Samples D, E and F should be blow molded into one quart straight-‐wall generic
`base monolayer “motor oil bottles”. The cross-‐section can be rectangular or square. The
`bottom corners should have radii as small as commercial motor oil bottles. Bottle height should
`be typically for one quart motor oil bottles. Neck may be offset. The bottle must weigh 50 + 5
`grams.
`
`Control Sample D Resin should be blown first and followed by Samples E and F each blown
`under the identical conditions used for Sample D if possible. If the processing conditions need
`to be changed, then these changes must be documented and reported.
`
`
`Guidelines comparing Samples E and F to Control Sample D
`a. There should be no significant differences required when processing Samples E
`and F compared to Control Sample D. Small differences in blow mold settings
`are acceptable.
`b. A reduction in performance of bottles made from Samples E and F should not
`exceed the specified test limits when compared to Sample D bottles for the
`following tests:
`
`i. Visual inspection for surface defects including ‘orange peel’ and other
`surface roughness
`ii. Bottle integrity
`iii. Bottle height
`iv. Bottle weight
`v. Capacity
`vi. Top load
`vii. Drop impact
`viii. Stress crack resistance
`ix. Fouling on tooling
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`Page 9 of 12 Champions for Change®
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`Guidance
`No more than what seen for.
`Control D4 bottles, minimum
`10 bottles.
`
`No more than what seen for
`Control D4 bottles, minimum
`10 bottles.
`
`± 5% of Control D4
`
`0.012 inch minimum thickness
`0.012 inch minimum thickness
`0.012 inch minimum thickness
`
`± 5% of Control D4
`
`± 5% of Control D4
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`No more than 5% decrease
`from Control D4
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`No less than “95”% mean
`failure height vs. Control D4
`
`None observed vs. control for
`two hours of bottle making
`
`
`Test
`Appearance
`
`Bottle Integrity
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`Bottle Dimensions
`
`Thickness
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`
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`Total Bottle Weight
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`Capacity
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`Top Load
`
`Drop Impact
`
`Additional observation
`
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`Bottle Test Guideline Criteria
`
`Measurement
`Visual defects including surface
`roughness
`
`Examination for incomplete
`bottles, blowouts or pinholes
`or parison curling or excessive
`die lines or excessive flash or
`weak weld line or bottle
`warping, or incomplete pinch
`off
`Height
`
`Shoulder
`Top, mid, bottom side wall
`Base corner
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`Weight
`
`Brimful
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`ASTM D2659
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`Mean failure height per ASTM
`D2463, procedure B, Bruceton
`Staircase
`
`Deposits on tooling
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`
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`Examination Two: Stress Crack Testing
`Stress cracking is an important issue for bottles which might hold various liquids. Testing
`bottles themselves for stress crack performance can easily become a test of the method rather
`than a test of material because of how sensitive the outcome can be to how a bottle is made.
`For that reason testing is done per ASTM D 1693 in the latest version. A test sample must be
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