Plastic Recycling Machine Quality Control from Drawing to Container

Where it starts

Where Quality Is Actually Decided

Quality control on recycling equipment is mostly not inspection. It is a sequence of decisions, each of which closes off a class of failure that no later check can catch. This page walks that sequence from drawing approval to the container.

Two BKL-MACHINE engineers checking a screw drawing on screen before a plastic recycling machine goes into production — The drawing is walked through on screen and agreed before any steel is cut.

Most cross-border equipment problems are not welding faults. They are misunderstandings from the drawing stage that were built perfectly. A machine sized for the wrong bulk density, wired for the wrong supply or laid out for the wrong building will pass every inspection after that point and still fail on your floor.

So four things are confirmed in writing before steel is cut. Your signature is on that drawing. If your site is 440 V at 60 Hz, or the only space you have is an L shape, this is the step where it becomes a design constraint rather than a problem discovered at installation.

01 Material and contamination What you are recycling and how dirty it arrives when it reaches the line.
02 Throughput target The kg/h the line is sized to, not the peak figure on a brochure.
03 Supply voltage and frequency Locked here, before steel is cut — not adjusted near the shipping date.
04 Workshop layout Your building decides the run of the line. An L-shaped bay is a design input.

In fabrication

Fabrication Checks

Plate thickness, weld quality on frames and tanks, rotor balance, and the machining tolerance on shafts and bearing seats. The first two are visible. The second two are what you are really paying for.

Welded tanks and frames of a plastic washing line standing in the BKL-MACHINE workshop before assembly — Visible **Plate, frames and tanks** Plate thickness on tank walls and frames, and whether weld seams run continuous where the frame carries the rotor. Tanks and troughs are cut and welded in-house, so the seam is ours to answer for.

Worker finishing the knife seats inside a shredder rotor chamber at the BKL-MACHINE factory, sparks visible — What you are paying for **Rotor, knife seats and balance** Rotor shafts, knife seats and bearing housings to the drawing. Balance and clearance are set here and effectively fixed once assembly starts.

Why this stage gets recorded rather than rushed. Balance decides how much the machine vibrates for the rest of its life; clearance decides output particle size and how fast the knives wear. Correcting either after a machine is assembled means taking it apart.

On the bay

Assembly and Electrical Checks

Motor and gearbox alignment, cabinet wiring against your supply, PLC interlocks, emergency stops and guarding. The question worth asking here is blunt: will the cabinet be built to 380 V and 50 Hz because that is what the shop is used to, and arrive wrong.

Control logic is itself an inspection item, not just a power-on test. A twin-shaft shredder with automatic start, stop, reverse and overload reversal is only proven when the overload condition is actually triggered and the rotor is watched to see whether it reverses. Lights coming on is not a passed test. The DS twin-shaft shredder is the machine where this matters most.

Assembled BKL shredder on its base frame with the free-standing control cabinet wired alongside in the workshop — The cabinet is built and wired next to the machine it drives, so a supply mismatch surfaces here rather than on your floor.

Before it is crated

The Test Run

No load first, then material where possible. What gets measured is specific.

Waste film travelling up the infeed conveyor into a BKL shredder during a loaded test run before shipment — A loaded test run — real film going up the infeed conveyor, not an empty machine spinning.

Running current: Against the nameplate, measured while material is going in — not at no load.
Temperature rise: On bearings and gearbox over a sustained run, not a two-minute start-up.
Water flow: Through the washing sections, at the rate the line is specified to.
Discharge: Whether output stays steady or surges. Surging is a feeding problem that shows up here or on your floor.

Hold the machine to your figures, not generic ones. A rigid washing line is specified to 8 to 16 mm flake and a PET bottle line to 12 to 20 mm, with final moisture below 1% after the drying section. Ask for the target that applies to the line you ordered, then ask to see it in the test record. Crusher and granulator output is set by screen aperture, and the centrifugal dryer is what carries the moisture figure.

Test running is recorded as video and photographs, and buyers or their representatives are invited to be present. See the machine run before it ships covers how that is arranged.

What comes off the line

What the Numbers Look Like in the Hand

Flake size and moisture are the two figures a test record turns on. These are trial-run outputs photographed on the floor, so you can see what the targets above actually mean.

Washed clear PP and PE flake after the drying section at BKL-MACHINE — **Washed flake** Rigid lines are specified to 8–16 mm, PET bottle lines to 12–20 mm.

Finished recycled plastic pellets held over a bulk bag at BKL-MACHINE — **Finished pellet** Uniform, no fines and no tails — what a converter actually pays for.

Washed film bagged and stacked after a trial run at BKL-MACHINE — **Trial output** Trial-run material is kept and photographed, not swept away.

In the container

What Ships with the Machine

Operating manualsFor the line as built, not a generic model booklet.
Electrical drawingsThe test below applies: can your own electrician wire from them without calling us.
Machine nameplatesModel, serial, rated power and supply, fixed to the machine.
Spare parts listWith whatever spares your order includes, itemised.
Packing photographsHow the machine was crated and secured.
Container loading recordWhat went into the container and in what order.

Completed HDPE drum washing line loaded and strapped on a flatbed trailer outside the BKL-MACHINE workshop — A finished line strapped down and leaving the yard, photographed for the file you keep.

One test of whether that pack is real: can you hand the electrical drawing to your own electrician and have them wire the machine without calling anyone. A drawing that only makes sense to the person who built the cabinet is not documentation.

On paper

Certification and Warranty

CE certificate for BKL plastic recycling and reprocessing machines under the Machinery Directive — **CE marking** EN ISO 12100:2010, scope: plastic recycling and reprocessing machines.

Utility model patent certificate held by Suzhou Beakeland Machinery — **Utility model patent** Granted on machine structure developed in-house.

Second utility model patent certificate held by Suzhou Beakeland Machinery — **Utility model patent** Granted on machine structure developed in-house.

Third utility model patent certificate held by Suzhou Beakeland Machinery — **Utility model patent** Granted on machine structure developed in-house.

Software copyright registration certificate held by Suzhou Beakeland Machinery — **Software copyright** Registration for the control software running on the lines.

What the certificates cover

CE marking is issued with the order, along with the standard export documents. We do not claim certifications the factory does not hold, so anything beyond CE should be confirmed in writing before you rely on it. That is a deliberately narrow statement, and a narrow statement you can verify is worth more than a wall of logos.

Certificates are a transfer of confidence at the point of purchase. What carries the machine through year three is the process above: a signed drawing, a recorded test run, a document pack your own staff can use, and parts you can still buy.

Warranty as part of quality

The equipment carries a twelve month warranty with wear parts excluded, technical support continues for the life of the line, and once the warranty ends knives, screens and bearings are supplied at cost price.

Read the length as a statement rather than a term. How long a builder is willing to stand behind a machine is a claim about how long they expect it to run without attention, made in a currency they have to honour. The factory behind the machines sets out the terms in full, and what a quotation does and does not cover explains why the spare-parts clause is a cost item rather than a courtesy.

Before you order

Quality Control FAQ

Four questions that come up once the specification is settled.

Want the record for a specific line?

Tell us the model and the material you will run. We will send the test-record format used for that configuration, so you know what you are signing off before the order starts.

Ask for a sample record

Is the electrical cabinet built for my voltage and frequency?

The default build is 380 V, 50 Hz, three phase, and other supplies are configured to order. The important part is when it is decided: your supply is locked in at the drawing approval stage, before any steel is cut, rather than being adjusted somewhere near the shipping date.

Can I see the test-run video before the balance payment?

Test running is recorded for every machine and the file is part of what you receive. When it is released relative to payment milestones is a commercial term rather than a technical one, so raise it while the order terms are being agreed rather than afterwards.

What happens if a part fails during the warranty period?

Send photographs, the nameplate and a description of what the machine was running when it stopped. That determines whether the cause is a component fault or an application issue, which decides how it is handled. Replacement parts then ship directly, and technical support walks your maintenance staff through fitting them.

Which documents ship with the machine?

Operating manuals, electrical drawings, machine nameplates, the spare parts list with whatever spares your order includes, and photographs of both the packing and the loaded container. Check the drawings are in a form your own electrician can work from before the machine leaves.

Ask before you order

Ask what gets checked on your line

The test record is only useful if it holds the machine to figures that apply to your material. Tell us three things and we will tell you what will be in it.

01What you are recycling, and how dirty it arrives. That sets the flake size and moisture targets the line is held to.
02The throughput you need to hold. Without it the current readings in the test record mean nothing against the nameplate.
03Your supply voltage and frequency. Locked at drawing approval rather than adjusted somewhere near the shipping date.

info@bkl-recycling.com +86 18852442182

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