BEST PRACTICES IN PET INTERMEDIATE PROCESSING
Storage: Baled PET
Issue: Properly stored bales help maintain the quality of prepared post-consumer PET plastics prior to sale and help improve workplace safety. Improperly stacked bales can fall causing serious injury to workers or damage to equipment at PET processing facilities.
Best Practices: In general, baled PET plastics should be stored in a fashion that keeps them clean and dry with limited exposure to sunlight (which can cause ฟtra-violet degradation of the PET plastic). Bales should be stored indoors. If they must be stored outdoors, they should be covered to limit exposure to moisture or sunlight. Bales should be stored on pallets or on clean, diy surfaces to avoid the introduction of contaminants. This is particularly true for plastic recycling facilities that handle more than one resin type of plastic.
When transporting bales throughout a facility, caution should be taken against pushing bales directly across the floor surface as this may embed unwanted contaminants into the bale. Bales should always be transported in a fashion that keeps them elevated off the floor surface. PET bales should not be stored in proximity to plastic granulators or other processing equipment to prevent the introduction of contaminants.
Proper stacking of bales is imperative to safe operations within a facility. Improperly stacked bales can fall, causing serious injury to workers or damage to plant equipment. The safe stacking height in a facility is a function of bale integrity, bale dimensions and ceiling height. In addition, there may be a number of regulatory limits to stack height and configuration based on local fire codes or buildings department regulations. For example, fire codes will require such things as proper clearances from sprinkler heads, that stored materials do not block aisles or points of exit or egress. Building codes may have limits on the amount of floor space that can be occupied with stored materials, or the load capacity for storage floors that are not on grade. Finally, the federal Occupational Safety and Health Administration (OSHA) requires compliance with all local requirements.
When stacking bales against a solid wall, it is important that the bottom bale of the first stack placed against the wall is not pushed flush against the wall, but set out about 6 inches so that the
upper bales on a stack can lean into the wall and not away from it. When bale stacks are not placed against a stationaiy wall, many facilities will ‘build” their stacks sequentially. That is, a forklift operator will not go to full height on an individual stack before starting another stack. In this way subsequent stacks reinforce the integrity and help brace the previous stack.
Baled material should be weighed and “tagged” with those weights prior to storage. This can help in weight determination when loading out truckload shipments (and ensuring that legal shipping weights for over-the-road transport are not exceeded) or in resolution of possible disputes regarding shipment weights.
Facilities that receive bales should store them in distinct “lots.” This is usually done in lots based on the material supplier. By storing materials in lots, it is easier to identify the source if inferior quality material is discovered during processing or if punitive price adjustments need to be made based on material quality or weight discrepancies. If the receiving facility is equipped with a platform or forklift scale, it is good practice to weigh a representative number of bales to verify the accuracy of packing list weights in the absence of weight tickets from certified truck scales.
BEST PRACTICES IN PET INTERMEDIATE PROCESSINGStorage: Baled PETIssue: Properly stored bales help maintain the quality of prepared post-consumer PET plastics prior to sale and help improve workplace safety. Improperly stacked bales can fall causing serious injury to workers or damage to equipment at PET processing facilities.Best Practices: In general, baled PET plastics should be stored in a fashion that keeps them clean and dry with limited exposure to sunlight (which can cause ฟtra-violet degradation of the PET plastic). Bales should be stored indoors. If they must be stored outdoors, they should be covered to limit exposure to moisture or sunlight. Bales should be stored on pallets or on clean, diy surfaces to avoid the introduction of contaminants. This is particularly true for plastic recycling facilities that handle more than one resin type of plastic.When transporting bales throughout a facility, caution should be taken against pushing bales directly across the floor surface as this may embed unwanted contaminants into the bale. Bales should always be transported in a fashion that keeps them elevated off the floor surface. PET bales should not be stored in proximity to plastic granulators or other processing equipment to prevent the introduction of contaminants.Proper stacking of bales is imperative to safe operations within a facility. Improperly stacked bales can fall, causing serious injury to workers or damage to plant equipment. The safe stacking height in a facility is a function of bale integrity, bale dimensions and ceiling height. In addition, there may be a number of regulatory limits to stack height and configuration based on local fire codes or buildings department regulations. For example, fire codes will require such things as proper clearances from sprinkler heads, that stored materials do not block aisles or points of exit or egress. Building codes may have limits on the amount of floor space that can be occupied with stored materials, or the load capacity for storage floors that are not on grade. Finally, the federal Occupational Safety and Health Administration (OSHA) requires compliance with all local requirements.When stacking bales against a solid wall, it is important that the bottom bale of the first stack placed against the wall is not pushed flush against the wall, but set out about 6 inches so that the upper bales on a stack can lean into the wall and not away from it. When bale stacks are not placed against a stationaiy wall, many facilities will ‘build” their stacks sequentially. That is, a forklift operator will not go to full height on an individual stack before starting another stack. In this way subsequent stacks reinforce the integrity and help brace the previous stack.Baled material should be weighed and “tagged” with those weights prior to storage. This can help in weight determination when loading out truckload shipments (and ensuring that legal shipping weights for over-the-road transport are not exceeded) or in resolution of possible disputes regarding shipment weights.Facilities that receive bales should store them in distinct “lots.” This is usually done in lots based on the material supplier. By storing materials in lots, it is easier to identify the source if inferior quality material is discovered during processing or if punitive price adjustments need to be made based on material quality or weight discrepancies. If the receiving facility is equipped with a platform or forklift scale, it is good practice to weigh a representative number of bales to verify the accuracy of packing list weights in the absence of weight tickets from certified truck scales.
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