{"id":3501,"date":"2026-04-10T06:16:02","date_gmt":"2026-04-10T06:16:02","guid":{"rendered":"https:\/\/kitech-recycling.com\/?p=3501"},"modified":"2026-04-10T06:36:32","modified_gmt":"2026-04-10T06:36:32","slug":"plastic-shredder-guide","status":"publish","type":"post","link":"https:\/\/kitech-recycling.com\/es\/blog\/plastic-shredder-guide\/","title":{"rendered":"Trituradora de pl\u00e1stico: tipos, tallas y gu\u00eda de costos"},"content":{"rendered":"

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Plastic Shredder Buyer’s Guide: How to Choose the Right Type, Size, and Budget for Your Recycling Line<\/strong><\/p>\n

Choosing a plastic shredder is one of the highest-stakes equipment decisions in any recycling plant. Got the wrong type, and it stalls your whole line; get the wrong size, and you\u2019re burning profit on inefficiency. Here are the six questions that will tell you which kind of machinery offers a profitable choice, and which will become a crushing bottleneck: what kind of material do you have, what size do you need, exactly what does the machine cost in five years, how do you maintain the rotor and blades, and what safety certifications does the manufacturer demand before setting down a purchase contract.<\/p>\n


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Quick Specs: Industrial Plastic Shredders<\/p>\n\n\n\n\n\n\n\n\n\n
Shredder Types<\/td>\nSingle Shaft \/ Dual Shaft \/ Granulator<\/td>\n<\/tr>\n
Rotor Speed Range<\/td>\n

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15\u2013500 RPM (type-dependent)<\/td>\n<\/tr>\n
Typical Output Size<\/td>\n

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6\u2013150 mm (screen-dependent)<\/td>\n<\/tr>\n
Motor Power Range<\/td>\n

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37\u2013275 kW<\/td>\n<\/tr>\n
Throughput Range<\/td>\n

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0.3\u20133.0+ T\/hr<\/td>\n<\/tr>\n
Price Range<\/td>\n

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$25,000\u2013$250,000+<\/td>\n<\/tr>\n
Key Standards<\/td>\n

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CE, UL, CSA, ISO 9001<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n


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Why Size Reduction Is the Bottleneck of Every Plastic Recycling Line<\/h2>\n

\"Why<\/p>\n

Pelletizer performance depends on upstream performance, and the best pelletizer in the world is irrelevant if upstream size reduction results in a clogging pain. Every industrial plastic recycling line is composed of what\u2019s called a process chain, and the process chain always follows the same basic sequence: size reduction, wash<\/a>, dry, granulate, pelletize. Each step has an optimal throughput ceiling, and the pressure 9 out of 10 times for plastic recycling is always on the first step\u2014that is, reducing the size of the material.<\/p>\n

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Here is how it works: high-torque, slow-RPM rotor\u2014shredders typically run at 40 to 80 RPM\u2014blows the material past cutaway blades and into a sizing screen. Open screen apertures will determine what particle size emerges from the system: 10 mm would be considered very fine, and 80 mm very coarse. A too-fine output would lead to very high volumes of oversize debris clogging wash tanks, whereas a too-coarse output generates excess by-products.<\/p>\n

Cascade effects are a predictable efficiency killer: a shredder that\u2019s rated for 0.75 T\/hr which is, say, designed to run at 30 RPM will barely be able to do even 0.50 T\/hr if its motor over loads every other minute in a 10-hour shift. For every hour that machine is brought to a halt, the other equipment in the line\u2014washer, dryer, and pelletizer<\/a>\u2014also stalls for the same length of time.<\/p>\n


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\ud83d\udca1 Real-World Example<\/p>\n

A plastic recycling operator in the Philippines manually cuts HDPE cars, trucks and crates to size before feeding a friction washer rated at 2.0 T\/hr throughput and a likewise- rated pelletizer. But the wash line never generated more than 0.90 T\/hr because manual cutting could not match the breakaways. Installing a 75kW single-shaft shredder rated for 2.0 T\/hr in the size reduction step increased downstream throughput to 1.80 T\/hr and allowed the system to crush 200,000 T\/year. Size reduction for this recycler was always the bottleneck; once it was fixed the machine paid for itself in less than a year through better throughput.<\/p>\n<\/div>\n

Knowing how to analyze the process bottleneck is your first step on the road to selecting the right size reduction machinery. Next question: what kind of size-reduction machine do I need?<\/p>\n


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Single Shaft vs Dual Shaft vs Granulator: How to Choose the Right Type<\/h2>\n

\"Single<\/p>\n

Certainly, it would be easy to settle on a single machine design for plastic size reduction, but in reality choosing the wrong design can cause perpetual headaches. Plate, single shaft, twin shaft or continuous flow; which one is right for your operating circumstances? The table below compares commercial single shaft and twin shaft machine designs, with representative specifications so you can see how the various types would perform in a typical process environment.<\/p>\n

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\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nSingle Shaft Shredder<\/th>\nDual Shaft Shredder<\/th>\nGranulator<\/th>\n<\/tr>\n<\/thead>\n
Rotor Speed<\/td>\n

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60\u201380 RPM<\/td>\n

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15\u201340 RPM<\/td>\n

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300\u2013500 RPM<\/td>\n<\/tr>\n
Torque Profile<\/td>\nHigh (hydraulic ram assist)<\/td>\nHighest (counter-rotating shafts)<\/td>\nModerate (speed-dependent)<\/td>\n<\/tr>\n
Output Size<\/td>\n

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20\u201380 mm (screen-controlled)<\/td>\n

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30\u2013150 mm (no screen, shear-cut)<\/td>\n

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6\u201312 mm (precision screen)<\/td>\n<\/tr>\n
Motor Power (typical)<\/td>\n

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37\u2013200 kW<\/td>\n

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22\u2013160 kW (2\u00d7 motors)<\/td>\n

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30\u2013132 kW<\/td>\n<\/tr>\n
Best Material Fit<\/td>\nRigid HDPE, PP crates, purging lumps, thick-wall rejects<\/td>\nBaled mixed plastics, drums, IBC containers, oversized items<\/td>\nPE\/PP film, PET bottles, clean regrind<\/td>\n<\/tr>\n
Feed Mechanism<\/td>\nHydraulic ram pusher<\/td>\nGravity \/ conveyor belt<\/td>\nGravity \/ conveyor belt<\/td>\n<\/tr>\n
Noise Level<\/td>\n

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75\u201390 dB(A)<\/td>\n

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70\u201385 dB(A)<\/td>\n

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85\u2013100 dB(A)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Single shaft shredders are the workhorse of rigid plastic recycling. Hydraulic ram pushes material against a rotating shaft with removable cutting blades. A sizing screen located below the rotor gate breaks the output\u2014material keeps circulating in the cutting chamber until pieces are small enough to pass through the opening.<\/p>\n

This single shaft plastic shredder<\/a> design belts thick-wall HDPE bottles, containers, crates, and boxes made of PP, ABS or similar material, and even push-out lumps that would stop a granulator.<\/p>\n

A dual shaft shredder is designed to operate at the maximum torque at the minimum rpm. It has two shafts turning in opposite directions and fitted with some form of shear cutters that are spaced so they will intermesh. Material is sheared against a counter shaft assembly with no sizing screens, resulting in large lumps with a rough 30-150mm size distribution.<\/p>\n

They are ideal for primary volume reduction of bulky, oversize material e.g. bales of post consumer waste, 200-liter drums, IBC’s before final size reduction with a second stage machine.<\/p>\n

Granulators run at 300-500 RPM and provide the highest quality result: 6-12mm flakes for extrusion. They are the used for clean, pre-sorted streams \u2013 PE \/ PP film, PET bottles, post-industrial regrind etc. \u2013 where the stream is fine enough for the high speed cutting blades of the unit to handle without showing excessive torque. For film types a specific plastic film shredder<\/a> with having a broad cutting chamber and wear resistant anti\u2010Wrap Rotor geometry will give the more optimum result.<\/p>\n

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Material-to-Machine Decision Matrix<\/p>\n

\n\n\n\n\n\n\n\n\n
Your Material<\/th>\nTarget Output<\/th>\nRecommended Type<\/th>\n<\/tr>\n<\/thead>\n
PE\/PP film, PET bottles<\/td>\n6\u201312 mm flakes<\/td>\nGranulator (one-stage)<\/td>\n<\/tr>\n
Rigid HDPE, PP crates, ABS<\/td>\n20\u201350 mm for washing<\/td>\nSingle shaft shredder<\/td>\n<\/tr>\n
Baled mixed plastics, drums<\/td>\n30\u201380 mm coarse reduction<\/td>\nDual shaft shredder<\/td>\n<\/tr>\n
Mixed rigids \u2192 extrusion pellets<\/td>\n6\u201312 mm final<\/td>\nShredder + Granulator (two-stage)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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What is an easy, yet costly mistake: a granulator for thick-wall (8 mm + wall thickness) HDPE drums. You can’t use a granulator for thick wall higher speed is what drives a granulator. Thick wall is very resistant to high speed cutting.<\/p>\n

Also a cheap blade will be prone to chipping. Material over 6-8 mm wall thickness should be put through a single shaft shredder or dual shaft shredder before final sizing with a granulator. Please see the shredder vs granulator discussion and single shaft vs twin shaft shredder<\/a> discussion.<\/p>\n

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\u2714 Single Shaft Advantages<\/p>\n