Plastic Recycling business prospect?
Plastic recycling is the process of recovering scrap or waste plastic and reprocessing the material into useful products. Since the vast majority of plastic is non-biodegradable, recycling is a part of global efforts to reduce plastic in the waste stream, especially the approximately 8 million metric tonnes of waste plastic that enters the Earth’s ocean every year.
Compared with lucrative recycling of metal, and similar to the low value of glass recycling, plastic polymers recycling is often more challenging because of low density and low value. There are also numerous technical hurdles to overcome when recycling plastic. Materials recovery facilities are responsible for sorting and processing plastics, but have struggled to do so economically as of 2019. Thus the Governments strongly support the waste plastic recycling plant.
Plastic recycling plant can have much profits on base of low price of waste plastic price. As after plastic recycling process, the waste plastic changes into granules of flakes, they can be used to manufacture many new products made of plastics, which is not very high standard of plastics such as shopping bags, sewage pipe, water basin, etc. And of course if recycle the new plastics, it can be used to manufacture high standard products.
When different types of plastics are melted together, they tend to phase-separate, like oil and water, and set in these layers. The phase boundaries cause structural weakness in the resulting material, meaning that polymer blends are useful in only limited applications. The two most widely manufactured plastics, polypropylene and polyethylene, behave this way, which limits their utility for recycling. Each time plastic is recycled, additional virgin materials must be added to help improve the integrity of the material. So, even recycled plastic has new plastic material added in. The same piece of plastic can only be recycled about 2–3 times before its quality decreases to the point where it can no longer be used.
Seven groups of plastic polymers,each with specific properties, are used worldwide for packaging applications (see table below). Each group of plastic polymer can be identified by its plastic identification code (PIC), usually a number or a letter abbreviation. For instance, low-density polyethylene can be identified by the number “4” or the letters “LDPE”. The PIC appears inside a three-chasing-arrow recycling symbol. The symbol is used to indicate whether the plastic can be recycled into new products.
The PIC was introduced by the Society of the Plastics Industry, Inc., to provide a uniform system for the identification of various polymer types and to help recycling companies separate various plastics for reprocessing. Manufacturers of plastic products are required to use PIC labels in some countries/regions and can voluntarily mark their products with the PIC where there are no requirements.Consumers can identify the plastic types based on the codes usually found at the base or at the side of the plastic products, including food/chemical packaging and containers. The PIC is usually not present on packaging films, since it is not practical to collect and recycle most of this type of waste. PLease refer to the below table for plastic codes of different types and forms:
|Plastic identification code||Type of plastic polymer||Properties||Common packaging applications||Melting- and glass transition temperatures (°C)||Young’s modulus (GPa)|
|Polyethylene terephthalate (PET, PETE)||Clarity, strength, toughness, barrier to gas and moisture.||Soft drink, water and salad dressing bottles; peanut butter and jam jars; ice cream cone lids; small consumer electronics||Tm = 250;Tg = 76||2–2.7|
|High-density polyethylene (HDPE)||Stiffness, strength, toughness, resistance to moisture, permeability to gas||Water pipes, Gas & Fire Pipelines, Electrical & Communications conduit, hula hoop rings, five gallon buckets, milk, juice and water bottles; grocery bags, some shampoo/toiletry bottles||Tm = 130; Tg = −125||0.8|
|Polyvinyl chloride (PVC)||Versatility, ease of blending, strength, toughness.||Blister packaging for non-food items; cling films for non-food use. May be used for food packaging with the addition of the plasticisers needed to make natively rigid PVC flexible. Non-packaging uses are electrical cable insulation; rigid piping; vinyl records.||Tm = 240;Tg = 85||2.4–4.1|
|Low-density polyethylene (LDPE)||Ease of processing, strength, toughness, flexibility, ease of sealing, barrier to moisture.||Frozen food bags; squeezable bottles, e.g. honey, mustard; cling films; flexible container lids||Tm = 120;Tg = −125||0.17–0.28|
|Polypropylene (PP)||Strength, toughness, resistance to heat, chemicals, grease and oil, versatile, barrier to moisture.||Reusable microwaveable ware; kitchenware; yogurt containers; margarine tubs; microwaveable disposable take-away containers; disposable cups; soft drink bottle caps; plates.||Tm = 173; Tg = −10||1.5–2|
|Polystyrene (PS)||Versatility, clarity, easily formed||Egg cartons; packing peanuts; disposable cups, plates, trays and cutlery; disposable take-away containers||Tm = 240 (only isotactic);Tg = 100 (atactic and isotactic)||3–3.5|
|Other (often polycarbonate or ABS)||Dependent on polymers or combination of polymers||Beverage bottles, baby milk bottles. Non-packaging uses for polycarbonate, compact discs, “unbreakable” glazing, electronic apparatus housing, lenses (including sunglasses), prescription glasses, automotive headlamps, riot shields, instrument panels.||Polycarbonate: Tg = 145;Tm = 225||Polycarbonate: 2.6; ABS plastics: 2.3|
Tip 1: Capital
Make a at least five-year invest of plastic recycling business plan, to see how much you can collect to put into the plastic recycling machinery business, then to decide which types of invest project is fit for you.
Tip 2: Machine Auto level
This step depends on if you have enough cheap long time labour for your plastic recycling plant, if the workers are professional for recycling machinery technology. Normally say, the higher auto level the recycling machine will save you cost in long run. It will lower the average cost per metric ton of final products.
Tip 3: Machine feeding system
It relies on the workers quanity you have, if you have enough workers for this position of especially feeding. Most plastic recycling plant run 24 hours a day 3 shifts. It needs one or several workers to feed the material constantly. If your funds permits, suggest you take auto feeding conveyor machine.
Tip 4: Reducer
Plastic Extrusion machinery have reducer to adjust the speed of screw push output, as when the plastic melting in screw and cylinder, the running speed of screw if very fast, if not use reducer, the screw break down easily.
Reducer types include hard tooth, medium hard tooth, round turbine. They distinguish from each other for the effect of melt and the noise. Best we suggest is hard tooth, then medium hard tooth, round turbine. The last type is despairing nowadays as its large noise.
Tip 5: Screw&Cylinder
As acknowledged, the plastic extruder plastic melting effect is decided to screw compress part, measure part, melting part, transport out part. All these parts total effect is very important to your final product quality level. Thus the material of screw&cylinder is important. Most used material is 38CrMoAL Nitriding, 45# stainless steel quenching. The previous one is better and longer life time.
Tip 6: Electrical parts
Plastic machinery electrical parts include the heating system, control parts, motor, convertor. Heating system have stainess steel, ceramic, electro-magnetic. the last one is most expensive and long time power saving, it fits for large capacity line, and power consuming material, like film recycling line. the other two most time mixed usage and more cheap. Motor you can have brand like Simens, some chinese brand also have good effect. electric control parts always Snidier and Omron, chinese famous brand is delixi, xinling., etc.
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