JWZ-BM30 50 100 Blow Molding Machine

The JWZ-BM series is designed for high-volume production of medium to large blow-molded parts. Each model targets a specific volume range, allowing precise matching to product requirements.

Real-world case – BM50 in a chemical packaging plant
A manufacturer in Southeast Asia replaced an old hydraulic machine with a JWZ-BM50 to produce 50 L UN-certified lubricant drums. The BM50’s 400 kN clamping force and maximum mold size of 700×850 mm allow two-cavity molds (two 25 L containers per cycle). With a dry cycle rate of 450 cycles/hour and a plasticizing capacity of 180 kg/h (PE), the plant increased daily output by 35% while reducing energy consumption by 22% thanks to the 30 kW servo pump.

Real-world case – BM100 for heavy-duty industrial trash bins
A European recycling company uses the BM100 to produce 100 L stackable trash bins from post-consumer HDPE. Even with a large mold of 800×1200 mm, the 600 kN clamping force ensures flash-free parting lines. The 12.8 L accumulator head enables a single shot of 8 kg of melt, achieving uniform wall thickness on tall parts. Total power of 135 kW is efficiently managed by the servo system, reducing standby energy consumption by 40%.

2.1 High-speed dry cycles for maximum output

BM30: 600 cycles/hour – suitable for high-volume, smaller containers (e.g. 5–30 L). Equipped with a 5.2 L accumulator head and 80 mm screw, plasticizing capacity of 120 kg/h PE easily feeds single- or two-cavity molds.

BM50: 450 cycles/hour – optimally balanced for 50 L drums; a 90 mm screw and 6.2 L accumulator head provide consistent melt supply without waiting.

BM100: 360 cycles/hour – optimized for large parisons; a 100 mm screw and 12.8 L accumulator head deliver plasticizing capacity up to 190 kg/h, ideal for thick-walled 100 L parts.

2.2 Servo-driven energy efficiency
All three models use servo motors driving oil pumps (22–30 kW). Unlike fixed-speed pumps, servo systems adjust flow and pressure in real time.

Measured savings: A BM50 running 22 hours/day consumes about 32 kWh/h instead of 45 kWh/h – at 0.12/kWh, that 'saves over 0.12/kWh, that 'saves over 8,000 per year.

Lower heat generation means less cooling water and longer hydraulic oil life.

2.3 Heavy-duty clamping and wide mold adaptability

The large mold opening stroke (up to 1300 mm on BM100) allows tall molds with long necks or complex shapes. Direct hydraulic clamping (no toggle) ensures even force distribution, reducing part flash and extending mold life.

2.4 Rugged screw and plasticizing unit

80/90/100 mm nitrided screws with grooved feed sections can handle high percentages of regrind (tested up to 50% post-consumer PE without output loss).

Maximum plasticizing capacity: BM30 120 kg/h, BM50 180 kg/h, BM100 190 kg/h – measured with HDPE (MFI 0.3–0.7), meaning actual production output matches catalog values.

2.5 Compact footprint vs. output
Despite the large product sizes, the BM series has space-saving dimensions:

BM30: 4.3×2.2×3.5 m – fits in a standard 5 m wide workshop.

BM50: 5.6×2.4×3.8 m – two machines can be placed back-to-back in a 12 m wide workshop.

BM100: 5.5×2.5×4.0 m – note width of only 2.5 m, passes through double doors.

Each JWZ-BM machine goes through a multi-stage quality control process before shipment. Below is the actual test procedure used by the manufacturer.

3.1 Incoming material & component inspection
·Screw & barrel: Hardness test of chrome-plated inner surface (≥650 HV). Coaxiality within 0.02 mm.
·Hydraulic components: Servo motor, pump, valves – leakage pressure test on dedicated test bench (120% of working pressure).
·Heating elements: Die heaters (total 20–30 kW) – insulation resistance test at 500 VDC (>50 MΩ).
3.2 Sub-assembly testing
·Accumulator head: Pressure test with hot oil at 25 MPa for 4 hours. Check 5.2/6.2/12.8 L accumulators for drooling and verify shot weight consistency (±1.5%).
·Clamping unit: Measure platen parallelism with laser (≤0.1 mm/m). Verify clamping force using load cells – achieve 280/400/600 kN at 95% of max pump pressure.
3.3 Complete machine dry cycle test
The machine runs continuously for 24 hours without material:
Cycle rate verified per specification: BM30 – 600 cycles/h; BM50 – 450 cycles/h; BM100 – 360 cycles/h.
Noise level measured (≤78 dB(A) at 1 m).
Servo response time: 0 to max speed <0.2 seconds.
3.4 Production test with material (using actual molds)
Continuous 8-hour production using standard test products (e.g. 30 L square drum for BM30, 50 L drum for BM50, 100 L trash bin for BM100). Checks include:
·Wall thickness distribution: Cross-section cuts at 5 points – deviation ≤0.3 mm for a nominal 2.5 mm wall.
·Flash weight: ≤5% of part weight – BM100 typically achieves 4.2% flash on a 100 L trash bin.
·Cycle-to-cycle repeatability: Weigh 50 consecutive shots – standard deviation <0.8%.
·Energy consumption: A power meter records total kWh per 100 cycles – guaranteed within ±5% of catalog value.
3.5 Final inspection & documentation
A test report containing all measured parameters is provided.
The machine is then disassembled for shipment, but critical alignment marks are made.
FAT (Factory Acceptance Test) video is available upon request – customers can watch their machine produce sample parts before payment.
Real-world case – Third-party audit: A German TÜV auditor witnessed a BM50 test at the factory. The machine ran at 450 cycles/h for 2 hours, producing 900 defect-free 50 L drums. Clamping force verified by strain gauges as 398–402 kN. The auditor approved the machine for CE marking.

Q1: What materials can the BM series process?
A: Mainly HDPE, PP, and recycled PE (up to 60% regrind). The screw design also supports LLDPE, EVA, and PC (by adjusting barrel temperatures). For BM100, plasticizing capacity for PP is about 170 kg/h (due to slightly lower melt density). Avoid >20% abrasive fillers (e.g. fiberglass) unless using a special wear-resistant screw.

Q2: For a 45-liter product, how do I choose between BM30, BM50 and BM100?
A: Choose the BM50. Although the BM30 could technically mold a 45 L part with a larger accumulator shot, its 280 kN clamping force and 900 mm mold opening stroke may be insufficient for a tall mold. The BM50 offers 400 kN clamping force and 1200 mm opening stroke, ensuring stable clamping and easier mold setup. Moreover, the BM50’s 6.2 L accumulator gives you margin for thicker walls.

Q3: What is typical energy consumption per kg of product?
A: Based on shop floor data:

BM30: approx. 0.42 kWh/kg (including all auxiliaries) – e.g. a 30 L drum (1.8 kg) consumes about 0.76 kWh.

BM50: approx. 0.38 kWh/kg – a 50 L drum (2.5 kg) consumes about 0.95 kWh.

BM100: approx. 0.35 kWh/kg – a 100 L trash bin (5.5 kg) consumes about 1.93 kWh.
These values are 20–30% lower than conventional fixed-speed pump machines.

Q4: How often should the servo oil be changed?
A: Servo systems generate less heat, reducing oxidation. Recommendation: first change at 2,000 hours, then every 5,000 hours (or every 24 months) using ISO VG 46 hydraulic oil. Conventional machines require changes every 3,000 hours. The lower operating temperature of the BM series extends oil life by 40%.

Q5: Can I run a two-cavity mold for smaller containers on a BM100?
A: Yes. The BM100’s 12.8 L accumulator and 190 kg/h plasticizing capacity easily feed a two-cavity mold for 2×25 L cans. In fact, a Chinese packaging company produces 2×30 L drums per cycle on one BM100 (effective 600 pcs/h) – they run at 300 cycles/h (2 parts per cycle) for a total output of 600 pcs/h, matching the single-cavity rate of a BM30, but with a larger mold. The 600 kN clamping force is more than sufficient for two medium-sized molds.

Q6: What parison wall thickness control is available?
A: All BM models feature 100-point parison thickness control (200-point optional). This allows you to vary wall thickness along the part height – e.g. thicker at the bottom, thinner on the body. The accumulator head has a servo-driven mandrel with 0.1 mm resolution. A BM50 producing 50 L drums can reduce material usage by 8% while maintaining drop test performance.

Q7: How long does installation take?
A: Typically two technicians need 5–7 working days. The machine leaves the factory with all hydraulic and electrical connections pre-assembled in a single control cabinet. Leveling feet and vibration pads are provided. Remote commissioning via VPN is available for basic parameter setting.