Grace Machinery Co., Ltd

Grace Machinery Co., Ltd A World-class Plastic Extrusion and Recycling Machinery Manufacturer

Confused by twin-screw terminology? Let's make it simple. 🧠Two key concepts: Intermeshing & Self-WipingINTERMESHING = tw...
15/08/2026

Confused by twin-screw terminology? Let's make it simple. 🧠

Two key concepts: Intermeshing & Self-Wiping

INTERMESHING = two screws lock together – material moves forward, no backflow. Think of it as positive displacement.

SELF-WIPING = one screw cleans the other – every rotation scrapes off residue. No burnt material. No degradation.

Why it matters for UPVC:

✔ Faster melting
✔ Uniform temperature
✔ Stable output (fluctuation

Labels won‘t peel off your plastic scrap? 😤Hot-melt adhesive is tough. Cold water won‘t touch it.Grace‘s label-removal s...
14/08/2026

Labels won‘t peel off your plastic scrap? 😤

Hot-melt adhesive is tough. Cold water won‘t touch it.

Grace‘s label-removal system:

1️⃣ Hot wash – 85–95°C – chemical + thermal = bond break

2️⃣ Tri-axial friction washer – 3 spindles × 30 m/s – scrubs every surface

3️⃣ Z-type air classifier – removes >98% of label dust

The numbers:
✔ Adhesive residue ≤5ppm
✔ Purity >98%
✔ Profit margin +30%

From dirty scrap to premium pellets. 💪

Got label problems? Drop a comment or message us!

Ever wonder what each section of a single-screw actually does? 🤔Let‘s break it down:1. FEED ZONE – moves material in, st...
07/08/2026

Ever wonder what each section of a single-screw actually does? 🤔

Let‘s break it down:

1. FEED ZONE – moves material in, starts preheating

2. MELTING ZONE – where solid becomes melt (compression happens here!)

3. METERING ZONE – evens out pressure & temperature before the die

Key numbers:

✔ Compression ratio: HDPE 3.5–4.0 / UPVC 2.0–2.5

✔ L/D ratio: 30:1 to 40:1 – more length = better plasticization

✔ Longer screw = better output stability

Grace single-screws: Designed with precise zone allocation for consistent melt quality.

Got a screw question? Drop a comment or message us! 👇

High electricity bills eating your recycling profit? 💸Energy is 30%+ of your OPEX. Cut it by 15–20% – and watch your bot...
31/07/2026

High electricity bills eating your recycling profit? 💸

Energy is 30%+ of your OPEX. Cut it by 15–20% – and watch your bottom line grow.

Grace‘s energy-saving toolkit:

✅ Flywheel on shredders – smooths load spikes → -15% energy, +25% efficiency

✅ Permanent magnet motors → +10% efficiency vs. traditional motors

✅ Infrared heating → -30% energy vs. resistance heaters

✅ SC8000 smart control – no idle running, dynamic load matching

✅ Water reuse >98% – less pumping, less waste

The numbers:
⚡ 24 kW·h/ton (industry: 30–40)
👷 Labor cost -40–50%
💰 ROI ~3.6 months

Stop paying for wasted energy. 💪

Want an energy assessment? Drop a comment or message us!

Screw scoring and flight wear killing your extruder? 🔧Here‘s what‘s causing it – and how to fix it.4 causes:❌ Shaft misa...
30/07/2026

Screw scoring and flight wear killing your extruder? 🔧

Here‘s what‘s causing it – and how to fix it.

4 causes:
❌ Shaft misalignment
❌ Bent screw
❌ Hard contaminants (metal, sand)
❌ Unaddressed barrel wear

3 fixes:

1️⃣ Laser alignment – 0.01mm accuracy
2️⃣ Screw repair – hardfacing + wear coating – restore >90% of original performance
3️⃣ Barrel remanufacturing – cost just 40-60% of a new barrel

Bottom line: Repair costs less than replacement. And performance is close to new.

Got a worn screw or barrel? Drop a comment or message us! 👇

Extruder barrel worn out? That‘s expensive. 💸Replacement can cost 1/3 of your entire machine. Here‘s how to choose the r...
24/07/2026

Extruder barrel worn out? That‘s expensive. 💸

Replacement can cost 1/3 of your entire machine. Here‘s how to choose the right lining and make it last:

Option 1: Nitriding
✔ HV900–1100 hardness, good wear resistance
✔ Best for: HDPE, PP (non-corrosive)

Option 2: Bimetallic
✔ 1.5–3mm Ni/Co alloy layer, HRC55–65
✔ Best for: UPVC, CPVC
✔ 2–3x longer life than nitriding

Option 3: High-Nickel Alloy
✔ 50%+ nickel content – excellent corrosion resistance
✔ Best for: CPVC, halogenated compounds

The payoff: Choose right → barrel life 2–5x longer.

Got a question about barrel selection? Drop a comment or message us! 👇

Black spots in your recycled pellets? That‘s money down the drain. 💸Pellets with black spots sell for $70–200 LESS per t...
23/07/2026

Black spots in your recycled pellets? That‘s money down the drain. 💸

Pellets with black spots sell for $70–200 LESS per ton than clean ones.

Here‘s how Grace Machinery eliminates them:

Two-stage purification:
1️⃣ Primary extruder – removes large impurities (auto-cleaning screen)
2️⃣ Secondary extruder – 80–120 mesh fine screen – catches carbonized particles

Vacuum exhaust:
✔ Removes moisture, ink residue, volatiles
✔ No bubbles, no pinholes

Infrared + AI temp control:
✔ ±0.1°C precision – no localized overheating
✔ 50% faster warm-up

The result: Purity up to 99.8% – film-grade pellets that command a premium.

Stop settling for low-grade prices. 💪

Got a pellet quality problem? Drop a comment or message us!

Torque just spiked to 95%+? 😰Don‘t panic. Here‘s your 5-step rescue plan:1. Reduce screw speed to 50–60% – see if torque...
18/07/2026

Torque just spiked to 95%+? 😰

Don‘t panic. Here‘s your 5-step rescue plan:

1. Reduce screw speed to 50–60% – see if torque drops

2. Check feed system – bridging? feeder issue?

3. Verify heating – all zones at temperature?

4. Check material batch – different batches = different flow behavior

5. Stop and inspect screw – metal contaminants may be lodged

Why it happens:
🔹 Sudden feed surge
🔹 Melt temperature too low
🔹 Metal objects in the material

Grace‘s solution:
✔ Torque sensors ±1% accuracy
✔ Auto deceleration + alarm
✔ Protection response

Wet film killing your pelletizing output? 🎞️💧Traditional centrifuges leave film at ~10% moisture. That means:❌ Screw sli...
18/07/2026

Wet film killing your pelletizing output? 🎞️💧

Traditional centrifuges leave film at ~10% moisture. That means:
❌ Screw slips → low output
❌ Steam overflow → messy, unsafe
❌ Bubbles & yellowing → poor pellet quality

Grace’s squeezer dryer solves it:

✔ Powerful mechanical squeezing – 185kW motor
✔ Moisture down to ≤5%
✔ Frictional heat pre-plasticizes film into ~20mm dense pellets
✔ Smooth feeding, no bridging

The results:
🔹 Pelletizing output +30%
🔹 Purity up to 99.8%
🔹 Labor cost -40%

Stop boiling off water. Squeeze it out instead. 💪

Got a wet film problem? Drop a comment or message us!

Extruder barrel temperature stuck high? 🔥You turn up the cooling – but nothing changes.Here‘s why:❌ Cooling water too co...
12/07/2026

Extruder barrel temperature stuck high? 🔥

You turn up the cooling – but nothing changes.

Here‘s why:

❌ Cooling water too cold = thermal stress, not better cooling
❌ High heating power = wasted energy, not faster warm-up
❌ Cooling only when too hot = overshoot and oscillation
❌ Air cooling vs oil cooling = not interchangeable

Grace‘s solution:
✅ Multi-zone PID control (±1.5°C per zone)
✅ Cooling capacity calculated for maximum load (+ margin)
✅ Smart heating – no wasted energy

Stop fighting your extruder temperature. Get it under control.

Got a hot-running extruder? Drop a comment or message us! 👇

Address

No. 1379 Nanhuan Road, High-tech Zone, Zhangjiagang City, Jingsu Province
Zhangjiagang
215600

Opening Hours

Monday 08:00 - 17:00
Tuesday 08:00 - 17:00
Wednesday 08:00 - 17:00
Thursday 08:00 - 17:00
Friday 08:00 - 17:00
Saturday 08:00 - 17:00

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