Is 5 Plastic Recyclable and Where PP Actually Goes

Number 5 plastic is polypropylene and it is fully recyclable as a material, yet its recovery rate still trails PET and HDPE. This article explains why the gap is on the collection side rather than the technical side, covering the four collection factors that hold PP back, the density band it shares with polyethylene that no float-sink tank can resolve, why multi-material packaging design is the other half of the problem, how rigid, woven and film PP streams each need a different front end feeding a common pelletizing stage, and what colour and odour do to the grade of the finished pellet.

23 Aug

Industry News | SUHUI Machinery

Is PVC Recyclable and What the Process Requires

PVC is recyclable and mechanically recycled PVC is an established industrial material, but it cannot travel through general household recycling. This article explains why PVC behaves unlike every other volume plastic, how rigid and flexible grades are two different feedstocks with different additive recipes, the three independent reasons it needs its own line, what a PVC granulating and pelletizing line actually controls from magnetic separation through gravimetric stabiliser dosing to air-cooled die-face cutting, the four variables that decide pellet quality, and where recycled PVC ends up.

22 Aug

Technology | SUHUI Machinery

How Polypropylene Recycling Sets the Grade of the Pellet

Polypropylene recycling is usually discussed as a collection problem. This article covers the other half — what recycled PP is as a resin. Why chain scission raises its melt flow index while polyethylene does the opposite, why the antioxidant package has to be rebuilt at the compounding step, how homopolymer, random copolymer, impact copolymer and mineral-filled grades all arrive in one bale looking identical, and what each destination for recycled PP actually demands.

22 Aug

Technology | SUHUI Machinery

Why LDPE Recycling Yields Less Than the Bale Weighs

LDPE recycling turns agricultural mulch, greenhouse cover, stretch wrap and packaging film into washed flake or pellet. The polymer is easy; what limits the operation is everything that arrives with it. This article follows the tonnage from bale to pellet — the six places it leaks away, how the three common film streams differ, why the last few points of moisture cost the most, and why printing ink sets the price of the output before the line is even specified.

22 Aug

Industry News | SUHUI Machinery

Is HDPE Recyclable and How LDPE Differs

HDPE is one of the two most recycled plastics in the world, and the reason is handling behaviour rather than chemistry. Rigid containers sit above the screen cut at a sorting facility, survive baling, float clear of PET and PVC in a water tank, and split into a premium natural grade and a coloured grade. LDPE is the same polymer family arriving as film, and it runs on completely different hardware. This article covers what makes rigid HDPE easy to recover, what LDPE is and why it takes a separate route, the four ways a mixed intake breaks both lines, and how a rigid washing line and a film washing line differ stage by stage.

21 Aug

Industry News | SUHUI Machinery

What Is HDPE and Why It Dominates Rigid Packaging

HDPE is high-density polyethylene, a thermoplastic whose almost unbranched chains pack into crystalline regions and give it stiffness, chemical resistance, a strong moisture barrier and toughness below freezing. This article works outward from that structure — what the density band really measures, which grade families exist and why they are not interchangeable, where HDPE wins in rigid packaging and buried pipe, how it behaves on a recycling line, what it cannot do, and how it differs from PVC.

21 Aug

Technology | SUHUI Machinery

HDPE vs LDPE vs PP and How to Tell Them Apart on the Line

HDPE, LDPE and PP are all hydrocarbon polyolefins, they all float in water, and no colour or smell separates them. This article gives the density and melting point bands that do separate them, a nine-line identification table with the field checks that stand in for each number, the point where PP and LDPE density bands overlap and float-sink stops working, how near-infrared sorting reads the difference and where it goes blind, and what a mixed polyolefin melt actually costs in impact strength and pellet grade.

Plastic Recycling Industry Blog

Is 5 Plastic Recyclable and Where PP Actually Goes

Is PVC Recyclable and What the Process Requires

How Polypropylene Recycling Sets the Grade of the Pellet

Why LDPE Recycling Yields Less Than the Bale Weighs

Is HDPE Recyclable and How LDPE Differs

What Is HDPE and Why It Dominates Rigid Packaging

HDPE vs LDPE vs PP and How to Tell Them Apart on the Line

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