How to Choose Plastic Pelletizing Services for US Molders

Choose a toll pelletizing processor by getting written agreement on accepted regrind, filtration, trial charges and pellet acceptance before authorizing the full lot. Make the following purchasing requirements explicit rather than assuming they are standard service features:

• Require before the trial: an accepted feedstock description, processing specification, measurable pellet limits, itemized quote and trial authorization.
• Require before production release: trial records, pellet tests, molding evaluation, identified retained samples and written customer approval.
• Add as needed: application-specific testing and separately commissioned laboratory work.

Confirm the processor accepts customer-owned regrind

Ask directly: “Will you accept our segregated regrind for toll conversion into feed pellets?” Confirm the business will process customer material—not sell you pelletizing equipment—and agree on the receiving and return-shipping arrangements before booking freight.

Hoehn Plastics is a service example: it advertises toll compounding and melt filtering, strand pelletizing, and processing of customers’ exact formulations in polypropylene, ABS, PC/ABS, polyethylenes, ASA, nylon and PBT. It describes its location as the Midwest. [1] Request the receiving address and confirmation it can handle your inbound shipment and return destination.

Treat the polymer list as a starting point, not approval of your lot. Request written acceptance of the material description, contamination, additive package and regrind condition. Specify whether acceptance covers a sample shipment, trial lot or production quantity.

Hoehn reports an average yield of 98% and annual capacity above 32 million pounds; these are vendor-reported figures, not a yield commitment or reserved capacity for your material. [1] Ask for job-specific material accounting and scheduling commitments.

Write a regrind brief tied to the intended part

Attach the same material brief to each quote request so processors respond to the same input and intended output:

• Material identity: polymer, post-industrial (PIR) or post-consumer (PCR) source, feed form and size. [2][4] Add the lot quantity as a purchasing field.
• Feed condition: bulk density, moisture, known contamination and current pretreatment, such as washing or drying. [2][4]
• Supporting material: photographs and representative samples—not simply a description such as “clean regrind.” [2][4]
• Intended output: intended application and pellet requirements, including size, moisture, contamination and melt flow. [2]

These fields draw on equipment guidance, not a toll-service intake form. Energycle sells pelletizing machinery; AMIGE provides machinery and process guidance. Neither is presented here as a US toll-processing option. [2][4] Ask the processor which additional molding or part requirements it needs before quoting.

Declare labels, paper, metal, sand, oil and incompatible polymers. AMIGE recommends identifying these contaminants and keeping resin streams separated according to resin and application requirements. [4]

Set measurable pellet acceptance limits

Attach an acceptance worksheet to the regrind brief. Organize each entry as characteristic → test method or conditions → agreed limit → sampling basis → decision owner. Define “usable pellets” through results, not simply successful extrusion and cutting.

Jiaxing Anyiju/GRS Plastics, a recycled-resin seller based in Zhejiang Province, China, offers background specification guidance—not a US toll-processing option. Its buying guide recommends these acceptance characteristics: [3]

• Identity: polymer, PIR/PCR source, permitted copolymers and excluded polymers. [3]
• Flow and moisture: MFI/MFR with test temperature, load and tolerance, plus a maximum moisture level appropriate to the polymer and application. [3]
• Physical consistency: bulk density, pellet geometry and a color reference. [3]
• Contamination and odor: black-speck or gel measurement method and limit, metal controls, non-melting contamination limit, and an odor method with acceptance criteria. [3]

The guide’s illustrative melt-flow tolerances and moisture targets are not universal limits; agree on application-specific values and measurement conditions. [3] Do not frame the order as a promise of virgin-equivalent properties or food-contact suitability.

Use the processor’s test menu to refine the worksheet. Hoehn lists melt-flow index, density, ash, tensile, impact, thermal and identity testing; it also says samples may be extruded, molded and visually inspected. [1] Ask which methods, reports and charges apply to your order rather than assuming the entire menu is included.

Keep processor testing separate from any independent laboratory order. Include evaluation in the intended molding process, as AMIGE recommends for downstream use. [4] Agree before the trial who decides whether each result passes.

Agree on extrusion, filtration and changeovers

Translate the acceptance limits into a processing plan. Ask which extrusion route, venting arrangement and filtration setup the processor proposes, and which operating conditions it will document.

Hoehn lists vented single-screw extrusion, melt filtration and strand pelletizing. Its vents are intended to remove moisture, trapped air and volatiles; these capabilities do not establish the operating recipe for your lot. [1]

Energycle’s machinery guidance distinguishes degassing, which reduces gases and volatile components, from filtration, which retains solid particles. Neither should be assumed to remove all ink, odor, gels or mixed polymers. [2]

Put these questions into the proposed specification:

• Filtration: Which filter arrangement and screen rating will apply? Request the rating convention, operating-pressure limits and screen-change triggers.
• Venting: Which venting or degassing arrangement will be used, and which settings will be recorded?
• Changeovers: How will the processor purge between materials or colors, identify transition output and segregate off-spec pellets?
• Formulation control: Will the processor obtain your approval before changing the formulation or adding additives or color?

Make these job-specific commitments part of the trial order. Request records of screen changes and deviations so you can check what ran against what you authorized.

Separate trial, setup and full-run charges

Request separate trial and full-run authorizations. Equipment purchase prices are not fees for converting customer-owned regrind. [2] Use these quote fields as buyer requests, not assumed provider policies:

• Itemized charges: trial processing, setup, purge, color change, filtration consumables, testing, packaging, freight, minimum billing and full-run processing. Ask which charges repeat after the trial.
• Billing basis: clarify whether the rate applies to received input, processed input or accepted pellet output.
• Material accounting: specify how purge, rejected pellets, removed contamination and unused regrind are weighed, charged, returned or disposed of—and who authorizes disposal.
• Trial scope: agree on quantity, duration and material allowance separately from the larger run.

Hoehn lists bulk-truck, gaylord and super-sack shipping formats. [1] Ask which apply to the job, how trial samples will be packaged and labeled, who arranges freight and which costs are included.

Hoehn also lists a typical lead time of 48 hours, but the cited page does not state whether this covers quotations, samples, trials, production or shipping. [1] Have the quote identify the milestone and the event that starts the clock.

Full-run pricing should remain separate from permission to process the remaining lot.

Document the trial and evaluate pellets in molding

Make the paid-trial authorization identify the input lot, quantity, operating scope, sampling plan and success criteria. Agree on trial duration and molding pass thresholds rather than treating pellet production alone as success.

AMIGE recommends documenting trial conditions and evaluating pellets in their intended downstream process. [4] Request a report covering:

• Input: feed composition, moisture and contamination measurements tied to the trial lot. [4]
• Operating conditions: throughput, temperatures, screen mesh, pressure, test duration and test conditions. [4]
• Output: actual pellet yield and evaluation in the intended downstream process. [4]

Add buyer-requested fields for filtration changes, deviations, additives, formulation changes and separately identified transition output. State these as report deliverables rather than assuming the processor routinely records them.

For molding evaluation, agree on operating conditions and relevant part checks before running the pellets. Record processing observations alongside test results, then compare each result with the acceptance worksheet.

Mark missing measurements as not evaluated, separately from failed results. Record the trial’s actual yield rather than substituting a vendor average. Request a report linking the input lot, processing conditions, pellet tests and molding evaluation to an approve, revise-and-retrial or reject recommendation. Keep unresolved results visible.

Link representative and retained samples to the lot

GRS Plastics recommends composite sampling from multiple bags or multiple points in a bulk delivery because a single grab sample can miss within-lot variation. [3] Use that background guidance to agree on how the trial sample will represent the output.

Propose separately labeled retained samples of the trial input and pellet output. Agree on quantities, packaging, storage conditions, retention period, sample holders and access for dispute testing. These are negotiated terms; the guide recommends a retain-sample policy and dispute-resolution path. [3]

Use a shared sample-and-lot register covering:

• Identity: input lot, output pellet lot, sample IDs, sampling points and sampling date.
• Production links: production date, packaging IDs, processing-record reference, test results and certificate of analysis where supplied.
• Retention: sample holder, storage and retention terms, and status of the represented material.

This proposed register implements the guide’s recommendations for lot, packaging, production-date and test-document traceability. If blending is authorized, record blend ratios and changeover timing; the guide cautions against mixing lots in a hopper without that documentation. [3] Ask how transition material and nonconforming output will be identified and segregated.

Confirm commercial terms before release

Ask Hoehn to confirm toll rates, setup or purge charges, minimum-run quantities, trial quantity or duration, minimum contract term, deposits, cancellation or refund terms, customer-material liability, rejection remedies, warranties, insurance and US-state delivery coverage in writing. [1] Confirm these points in the quote and order:

• Scope and price: Hoehn lists materials including Polypropylene, ABS, PC/ABS, Polyethylenes, ASA, Nylon and PBT; confirm trial and production quantities, itemized charges, billing basis, quote expiration and repeat setup costs. [1]
• Booking and coverage: receiving address, return destination, scheduling milestone, deposits, contract duration and cancellation terms.
• Responsibility: material loss or damage, insurance, nonconformance notification, quarantine, dispute testing, rework or replacement, refunds and disposal authority.

Define a nonconforming lot and the dispute-resolution path before production, consistent with GRS Plastics’ buying guidance. [3]

Release the full run after written customer approval

Make the trial order authorize only the trial. Propose holding the remaining material until your designated approver issues a written release; this is a purchasing requirement to negotiate, not an established processor practice.

Have the approver review the trial record, pellet tests and molding evaluation. The release should identify the retained reference sample, input lot, specification revision, processing conditions and production quantity. Sample approval should supplement measurable lot acceptance, not replace it.

Record one decision: approve the defined scope, require correction and another trial, or reject the trial and resolve material disposition under the agreed terms. Name the feedstock, formulation, filtration and other critical changes that would require renewed approval.

Before release: confirm material acceptance, specifications, charges, trial records, downstream results, retained samples and written authorization for the defined production scope.

References

1. Compounding / Pelletizing – Hoehn Plastics (hoehnplastics.com)
2. Plastic Pelletizing Machines for Recycling – Energycle (energycle.com)
3. Recycled Plastic Pellet: Specs, Quality Tests, and Buying Guide (grsplastic.com, 2025)
4. How to Make Recycled Plastic Pellets: Industrial Process (amgplastech.com, 2025)