A plastic shredder buying checklist should define the real feed, required output and operating conditions before a model or motor size is selected. Without these inputs, two quotations may describe completely different machines even when both claim the same hourly capacity.
The eight essential RFQ inputs are material, maximum feed size, required capacity, target output, contamination, duty cycle, line interfaces and site utilities. Buyers should also define how performance will be accepted.
I’m Jacky, CEO of AMIGE. The fastest way to improve a shredder quotation is to send the most difficult representative piece—not only a general material name. The largest, thickest or most contaminated feed often determines the machine configuration.
Eight inputs required for a plastic shredder RFQ
| RFQ input | Information to provide | Why it matters |
|---|---|---|
| 1. Material | Polymer, product form, photos, video and sample | Determines cutting principle and wear risk |
| 2. Maximum feed | Length, width, diameter, wall thickness and piece weight | Sets hopper, chamber and loading method |
| 3. Capacity | Required input and saleable output per hour | Defines the complete line, not only the shredder |
| 4. Output | Target size range and next process | Influences screen, cutters and number of stages |
| 5. Contamination | Metal, sand, liquid, labels, fibres and prohibited items | Affects safety, wear and separation |
| 6. Duty cycle | Hours per shift, shifts per day and planned days | Changes drive, cooling and maintenance requirements |
| 7. Line interfaces | Feeding, discharge, separators and downstream machines | Prevents bottlenecks and control conflicts |
| 8. Site conditions | Voltage, frequency, space, height, access and local standards | Determines installation and compliance scope |
Describe the material beyond its name
“Plastic waste” is not a usable machine specification. LDPE film, PP woven bags, HDPE drums, thick plastic lumps, pipes and mixed rigid scrap behave differently during feeding and cutting.
- State the polymer and whether it is known or mixed.
- Show loose, nested, bundled, baled or rolled feed condition.
- Identify moisture, temperature and abrasive fillers.
- List metal, stones, glass and other prohibited contaminants.
- Provide the largest and most difficult representative piece.
Define capacity with test conditions
Capacity changes with bulk density, piece size, feed consistency, cutter condition, screen opening and downstream restrictions. A quotation should state whether the figure is tested, estimated or guaranteed and describe the conditions behind it.
Ask for both hourly throughput and the planned operating schedule. A machine that meets one short test does not automatically meet the required annual tonnage.
Choose single-shaft, double-shaft or multi-stage reduction
A single-shaft shredder commonly uses a hydraulic ram and screen to create controlled discharge. A double-shaft shredder commonly uses two slow-speed cutter shafts for coarse reduction of bulky or irregular feed. Complex material may justify a coarse pre-shredder followed by a sizing stage.
Review our single-shaft vs double-shaft shredder comparison before selecting an architecture. The decision should follow the material and next process, not a universal rule.
Specify output for the downstream process
Define the acceptable output range and how it will be measured. Cutter width, cutter profile, screen opening, recirculation and material behavior all influence the result.
If the material feeds a granulator, washer, separator or pelletizer, confirm the maximum acceptable piece and required flow stability. Selecting a smaller screen without testing can increase recirculation, heat, fines and energy use.
Compare drive, cutters and maintenance access
- Motor, gearbox and usable torque under the stated feed
- Rotor or shaft arrangement and cutter geometry
- Knife material and heat-treatment specification
- Screen design and replacement access where applicable
- Bearing protection, lubrication and contamination control
- Time and tooling required to inspect, rotate or replace cutters
- Recommended spare and wear parts for the first operating period
Motor power alone cannot show whether the machine is suitable. Compare the complete mechanical system and expected cost per saleable ton.
Review controls, safety and site interfaces
The proposal should define feeding interlocks, load monitoring, overload response, emergency stops, guarding, lockout points and communication with upstream and downstream equipment.
Dust, noise, fire and ejected-material risks depend on the feed and installation. Batteries, sealed containers, cylinders, flammable residues and unknown hazardous material require dedicated acceptance rules.
For larger or difficult feed, use our heavy-duty industrial shredder guide to review the drive, cutter, frame, control and safety boundaries.
Create an acceptance test before ordering
- Agree on the representative material and feed preparation.
- Define the test duration and stable production period.
- Measure input, saleable output, rejects and downtime separately.
- Check output size using an agreed sampling method.
- Record energy under the stated operating condition.
- Confirm stop conditions, prohibited material and safety procedure.
- List which results are guarantees, targets or estimates.
Information AMIGE needs for a shredder quotation
Send material photos or video, polymer, maximum dimensions, wall thickness, piece weight, contamination, hourly input, target output, operating hours, loading method, downstream equipment, voltage, factory layout and applicable local standards.
Frequently asked questions
What is the first specification to confirm when buying a shredder?
Start with the real material, especially the largest and most difficult representative piece. Machine size, cutters, feed system and power cannot be selected reliably without it.
How should shredder capacity be compared?
Compare capacity using the same material, feed dimensions, output size, test duration and downstream conditions. Ask whether the value is measured, estimated or guaranteed.
Is a larger motor always better?
No. Usable performance depends on the complete drive, gearbox, shaft or rotor, cutters, screen, feeding and controls. An oversized motor does not correct the wrong cutting system.
Should buyers request a material test?
Yes when the feed is difficult, variable or commercially important. Agree on the sample, procedure and measurements before treating the test as purchasing evidence.
What should be included in an industrial shredder quotation?
It should define the machine, auxiliaries, performance basis, utilities, controls, safety scope, installation boundaries, documentation, commissioning, training, spares, exclusions and commercial terms.
