Choosing the right PET sheet extrusion line for food packaging production is one of the most consequential equipment decisions a rigid packaging manufacturer can make. The line you select determines sheet quality, running cost, scrap rate, and how easily you can shift between clear APET clamshells, freezer-to-oven CPET trays, and recycled-content RPET sheet as customer demand evolves. YuanSu, a Wanplas factory, has spent years engineering plastic film, sheet, and board extrusion lines, and this guide distills the practical selection logic buyers and plant engineers actually need. We cover PET grades, thickness windows, line architecture, capacity, drying, filtration, food-contact compliance, and a concrete requirement-to-model selection path so you can brief suppliers with confidence and avoid the costly mistakes that come from mismatched specifications. Whether you run a thermoforming shop serving fresh-produce trays or a converter supplying dual-ovenable meal trays, the fundamentals below apply directly to your capital plan.
Understand PET Sheet Grades for Food Packaging
PET sheet for food packaging is not a single material. The grade you extrude must match the end-use temperature, clarity, and sustainability requirements of the finished container. The three production grades most relevant to a food-packaging sheet line are APET, CPET, and RPET, and a well-designed line can often run all three with controlled changes to barrel temperature profile, drying, and filtration rather than a full machine swap.
APET, or amorphous polyethylene terephthalate, is the clear, glossy, rigid sheet most consumers recognize in deli clamshells and bakery trays. It is extruded below its crystallization onset so the sheet stays transparent and easy to thermoform. Its practical service window is roughly minus 40 degrees C to about 70 degrees C, which makes it perfect for cold and ambient foods but unsuitable for hot-fill or oven use. APET also welds, folds, and prints well, and it is the default choice when visual product presentation drives sales.
CPET, or crystallized polyethylene terephthalate, is engineered for the opposite extreme. By raising the crystal content during processing the sheet gains a stable service window from about minus 40 degrees C to over 200 degrees C, enabling freezer-to-oven and microwave-ready trays. CPET is opaque, tougher, and more dimensionally stable at heat, but it demands tighter barrel and calendar temperature control because crystallization must be managed, not avoided. A CPET-capable line carries extra heating zones and a controlled cooling profile so the crystallinity lands in the target band.
RPET is recycled-content sheet produced by blending recycled PET flake or pellet with virgin resin. Blending ratios can run from a few percent up to 100 percent, depending on flake quality and food-grade intent. RPET is the sustainability lever for brands under recycled-content mandates, but it stresses drying, degassing, and filtration because post-consumer flake carries moisture, volatiles, gels, and contaminants. The same line that runs virgin APET becomes an RPET line when you add crystallizing drying and robust melt filtration.
The practical takeaway is to treat grade flexibility as a design input, not an afterthought. If your customers may ask for recycled content next year, specify the drying and filtration capacity now. Retrofitting a line for high RPET content after commissioning is far more expensive than building the headroom in from the start. YuanSu positions these grades within a single PET sheet product family so converters can serve multiple food segments from one capital asset.
A further grade decision is monolayer versus co-extruded sheet. A monolayer APET or CPET roll is the simplest and cheapest to run, but every percent of recycled content sits in the food-contact layer, which complicates compliance. A co-extruded GAG structure, by contrast, places a recycled or low-cost core between two thin virgin PET skins, so only the virgin faces touch food while the core still carries the recycled claim. This is why many food converters specify a co-extrusion-ready line even when their first order is monolayer: the capability is there when a brand owner demands a recycled-content SKU with a clean migration story. The extra extruder and feedback layer add capital and complexity, but they convert a single-purpose asset into a platform that can chase both conventional and sustainable orders.
Grade also interacts with color and additive load. Clear APET for clamshells runs with minimal additive beyond a small slip or antistatic package, while CPET for oven trays may carry nucleating agents to control crystallinity and a pigment for brand color. Each additive must be food-contact approved for the service temperature, and overloading additives raises the risk of plate-out on the die and rolls, which shows up as streaks and forces more frequent cleaning. The line design should therefore include easy die and roll access and a cleaning window in the maintenance plan, because additive management is as much about uptime as about recipe.
Thickness Range and Application Mapping
PET food sheet spans roughly 0.15 mm to 2.0 mm in thickness, and the right thickness is dictated by the container geometry, fill weight, and the thermoforming process. Thinner sheet saves material and cost but risks wall thinning on deep draws; thicker sheet improves stiffness and barrier but raises resin consumption and forming energy. Matching thickness to application is the first filter in any line-selection discussion.
The table below maps common thickness bands to the food-packaging application they serve. Use it to translate a customer’s container spec into a sheet thickness target before you talk capacity.
Thickness versus Application for PET Food Sheet
| Thickness (mm) | Typical Grade | Food-Packaging Application | Forming Note |
|---|---|---|---|
| 0.15 – 0.25 | APET | Light blister packs, insert trays, confectionery wrap cards | Shallow draw, high-speed form-fill-seal |
| 0.25 – 0.50 | APET / RPET | Clamshells, bakery trays, fresh-produce punnets | Standard thermoforming, good clarity |
| 0.50 – 0.80 | APET / CPET | Meat and cheese trays, dairy pots, dual-use trays | Medium draw, higher stiffness needed |
| 0.80 – 1.20 | CPET | Freezer-to-oven meal trays, ready-meal trays | Heat stable, opaque, structural walls |
| 1.20 – 2.00 | CPET / multi-layer | Heavy catering trays, reusable containers, thick inserts | Deep draw, high load bearing |
Notice that thickness and grade overlap. A 0.50 mm tray can be APET for chilled dairy or CPET for a dual-ovenable meal; the difference is the barrel and calendar thermal regime, not the hardware envelope. For recycled content, RPET blends most easily in the 0.25 to 0.80 mm band where thin walls tolerate slight haze, while thick CPET at 100 percent RPET needs the strongest filtration and most careful flake sorting.
Line Configuration and Capacity Planning
A PET sheet extrusion line is a sequence of unit operations, and each unit must be sized to the slowest constraint. The standard architecture runs from resin handling through the extruder, melt pump, die, three-roll calendar, haul-off, and winder. Capacity is usually expressed in kilograms per hour of finished sheet, and it is governed by screw diameter, screw speed, and the thermal limit of the calendar to solidify the melt at line speed.
The table below shows a representative configuration matrix. These are configuration examples for planning, not fixed model numbers; the actual screw diameter and output scale with sheet width and thickness. Use the matrix to set the order-of-magnitude capacity your thermoforming line demands.
Typical Line Configuration versus Capacity and Thickness
| Configuration | Screw Diameter (mm) | Output (kg/h) | Thickness Range (mm) | Sheet Width (mm) |
|---|---|---|---|---|
| Compact single-screw line | 75 – 90 | 250 – 450 | 0.15 – 1.20 | 650 – 1000 |
| Standard single-screw line | 100 – 120 | 450 – 800 | 0.15 – 2.00 | 1000 – 1300 |
| Wide high-output line | 130 – 150 | 800 – 1200 | 0.20 – 2.00 | 1300 – 1500 |
| Co-extrusion multi-layer line | 90 + 75 (A/B/A) | 400 – 900 | 0.20 – 1.50 | 1000 – 1500 |
Capacity planning must also respect your downstream thermoforming scrap loop. Rigid thermoforming typically returns 30 to 60 percent web as skeleton scrap that is reground and can be fed back, often as part of the RPET blend. A line that only accepts virgin pellet forces you to sell or landfill that scrap; a line with a regrind-compatible feed throat turns trim back into sheet and lowers net resin cost. Factor the scrap return into the net virgin throughput you actually need.
Two more planning factors are line speed and utilities. Thinner sheet runs faster at the calendar for the same output, while thick CPET needs slower take-off and more cooling, so the rated kilograms per hour of a wide line can drop at maximum thickness. Confirm the supplier’s output curve at your target thickness, not just the headline number. On utilities, budget for three-phase power at the total kilowatt load, a chiller and cooling-water loop for the calendar and barrel, and compressed air for pneumatic conveying and screen changer; a co-extrusion or RPET line adds load on each. Flooring and headroom also matter: a 1500 mm line with a three-roll stack and overhead crane for roll change needs roughly 6 meters of clear height and a pit or platform for the winder, so verify the building before you commit to width.
YuanSu PET Sheet Extrusion Line Overview
As part of the Wanplas group, YuanSu builds the PET/GAG/PLA sheet extrusion line family for food, pharmaceutical, and industrial sheet. For food packaging the PET sheet line centers on a single-screw extruder with deep metering and gentle shear, a gear-type melt pump for stable delivery, a coat-hanger or fish-tail die for uniform cross-machine thickness, and a three-roll calendar that sets flatness and surface finish. Online thickness measurement and automatic roll gap control keep the sheet within tight tolerance.
The standard YuanSu PET sheet line is configured for virgin APET and CPET production and converts to RPET with the drying and filtration options described later. Key measurable targets from the YuanSu sheet platform include flatness of 0.1 mm per meter or better and multi-layer co-extrusion capability for GAG structures where a recycled core is sandwiched between virgin skins for food contact.
YuanSu PET Sheet Extrusion Line – Representative Specification
| Parameter | Standard Configuration | Engineering Note |
|---|---|---|
| Applicable material | APET, CPET, RPET blend | Grade set by barrel and calendar profile |
| Sheet thickness | 0.15 – 2.00 mm | Set by die gap and roll gap |
| Sheet width | 650 / 1000 / 1300 / 1500 mm | Width selected to forming layout |
| Output | 250 – 1200 kg/h | Scales with screw and width |
| Extruder type | Single-screw, L/D 33:1 | Gentle shear for low degradation |
| Melt pump | Gear pump, closed-loop control | Stabilizes pressure and thickness |
| Three-roll calendar | Polished rolls, 300 – 500 mm | Flatness 0.1 mm/m or better |
| Thickness control | On-line gauge, auto roll gap | Reduces scrap and weight variation |
| Total power | Approximately 150 – 480 kW | Depends on width and options |
This configuration is the workhorse for converters supplying clear clamshells and dual-ovenable trays. Because the line already carries on-line thickness measurement and automatic roll gap control, it directly attacks the two biggest cost leaks in sheet production: thickness overrun that wastes resin and off-spec rolls that a thermoformer rejects. Buyers should treat those controls as mandatory, not optional, for food-grade consistency.
RPET Blending Ratio and Configuration Adjustments
Recycled content is where many PET sheet projects stall, because the blending ratio drives concrete equipment changes. At low RPET content, say 0 to 30 percent, the standard line with good drying handles the blend with only modest filtration. As the ratio climbs toward 50 to 100 percent, moisture, volatiles, gels, and black specks multiply, and the line must add crystallization, stronger degassing, and continuous filtration to protect food-contact quality.
The table below links RPET blending ratio to the configuration adjustment required. Treat it as the checklist you hand to any supplier so the quoted line matches your recycled-content target rather than a virgin-only assumption.
RPET Blending Ratio versus Configuration Adjustment
| RPET Ratio | Drying and Crystallization | Filtration Requirement | Degassing |
|---|---|---|---|
| 0 – 30 percent | Standard dehumidifying dryer | Standard screen changer | Single vent |
| 30 – 70 percent | Crystallizing dryer advised | Continuous screen changer | Vent plus side degassing |
| 70 – 100 percent | Crystallizing dryer mandatory | Dual filtration, melt filter | Strong vacuum degassing |
The reason is physical. Recycled flake carries surface moisture and absorbed water that hydrolyze PET at extrusion temperature, cutting molecular weight and making brittle sheet. It also carries food residue, ink, and label glue that off-gas and form gels and black specks, which are visible defects and potential contamination in food contact. Crystallization prevents the flake from agglomerating and blocking the dryer, while continuous filtration strips gels without stopping the line. Getting these right is what separates a food-grade RPET sheet from a non-compliant one.
YuanSu RPET Sheet Extrusion Line Module
When recycled content is part of the brief, YuanSu offers the RPET-capable configuration of the same sheet platform, built around a crystallizing dryer, a high-efficiency dehumidifying dryer, and a continuous screen changer or melt filter before the melt pump. This keeps the line running while filtration media is exchanged and holds gel and black-speck counts within food-grade limits. For 100 percent RPET the line adds a second filtration stage and stronger vacuum degassing.
The RPET module is not a separate machine family but a configured variant of the YuanSu PET sheet line, which protects the buyer’s investment: the same spare parts, controls, and tooling apply, and you can run virgin APET on Monday and 100 percent RPET on Thursday by changing the feed and filter setup. That flexibility is exactly what food converters need as brand owners shift recycled-content commitments year to year.
YuanSu RPET Sheet Extrusion Line – Representative Specification
| Parameter | RPET Configuration | Benefit |
|---|---|---|
| RPET blending ratio | 0 – 100 percent | Meets recycled-content mandates |
| Dryer | Crystallizing plus dehumidifying | Moisture below 50 ppm |
| Filtration | Continuous screen changer or melt filter | No stop for screen change |
| Degassing | Vent plus vacuum zone | Low odor and volatiles |
| Sheet thickness | 0.15 – 2.00 mm | Same window as virgin line |
| Output | 250 – 1100 kg/h | Slightly below virgin at high ratio |
For buyers weighing sustainability claims, the RPET module combined with a regrind return loop means both post-consumer flake and in-house thermoforming trim become feedstock. That dual loop is the most realistic path to a low net-virgin-resin cost without compromising the food-contact status of the visible product skin, especially when you run a co-extruded GAG structure with virgin faces over a recycled core.
Key Process Parameters for Stable Output
Stable PET sheet comes from controlling a short list of process parameters. The barrel temperature profile must melt and homogenize PET without overheating, because PET degrades above about 290 degrees C and discolors and embrittles quickly. A typical profile rises from the feed zone near 250 degrees C to a melt zone around 275 to 285 degrees C, then the melt pump and die sit a few degrees lower to protect the polymer before it enters the calendar.
Screw speed sets shear and output. Higher speed raises output but also raises melt temperature and degradation risk, so the melt pump earns its place by letting the screw run at a safe speed while the pump delivers steady linear output to the die. Back pressure, monitored at the melt pump, is your early warning for a clogging filter or a tightening die. A rising trend tells you to swap the screen before the sheet thins out.
The three-roll calendar is where melt becomes sheet. Roll temperature, gap, and speed set thickness, gloss, and flatness. The first roll typically runs slightly above the PET glass transition temperature to avoid a rough, stressed surface, while the following rolls cool the web. Proper roll temperature balance prevents warpage and internal stress that would later distort a thermoformed tray. On-line thickness gauges feed the roll gap automatically so cross-machine variation stays inside tolerance.
Haul-off and winder complete the line. The winder must lay the sheet flat at constant tension so rolls do not telescope or telescope-stress, and edge trimming should feed back into the regrind loop. Throughout, closed-loop control from a PLC with recipe management lets an operator recall a proven setpoint for each grade and thickness, which is the single biggest contributor to consistent startup and low scrap across shift changes.
Screw geometry deserves attention because PET is shear sensitive. A general-purpose screw with a moderate compression ratio and a long metering zone gives gentle plasticizing and stable melt, whereas an aggressive high-shear screw heats the polymer by friction and risks localized degradation even at a safe barrel setpoint. For RPET, the screw must also handle variable bulk density from flake and regrind without surging, so a crammer or loss-in-weight feeder at the throat protects output stability. Measure melt temperature directly with a flush thermocouple at the pump inlet; if it climbs above the barrel setpoint by more than a few degrees, shear heating is the cause and you should lower screw speed or open the melt-temperature window through the pump.
Thickness uniformity is the metric that ties all parameters together. Cross-machine variation comes from die-bolt balance and roll alignment; machine-direction variation comes from pump and screw pulsation. On-line gauging with automatic roll-gap and die-bolt trim closes both loops, and the resulting coefficient of variation is what your thermoformer will feel as consistent wall thickness and fewer leakers or thin spots. Treat gauge and control as part of the specification, because a line without them only looks cheap until scrap and customer complaints arrive.
Drying, Crystallization and Melt Filtration
PET is hygroscopic and hydrolyzes in the barrel if not dried, so drying is not optional. Target a moisture content below about 50 parts per million before the hopper. Practical practice is four to six hours in a dehumidifying dryer at 160 to 180 degrees C, with crystallized flake for RPET to stop it clumping. Skipping or shortening drying shows up later as hazy sheet, low impact strength, and a falling molecular weight that a buyer discovers only when trays crack on the shelf.
Crystallization matters specifically for recycled or amorphous feed that would stick together in a hot dryer. A crystallizing dryer agitates and heats flake to the onset of crystallization so it flows freely and dries evenly. For virgin pellet this step is often unnecessary, but for RPET it is mandatory, and a line quoted without it cannot honestly claim food-grade high-recycle sheet.
Melt filtration removes gels, black specks, and unmelted contamination. A screen changer with a moving breaker plate swaps filter media without stopping the line, while a melt filter with a laser or ribbon screen holds finer micron ratings for high RPET content. The choice is a function of your RPET ratio from the earlier table: at 0 to 30 percent a standard screen changer is enough; at 70 to 100 percent you need continuous filtration plus a second stage. Filtration pressure drop is another live indicator the operator watches alongside back pressure.
Together, drying, crystallization, and filtration are the difference between a line that merely makes PET sheet and one that makes food-grade PET sheet consistently. They are also the parameters most often under-specified by low-cost quotations, so verify them explicitly when you compare offers rather than reading only the headline output and price.
Operator discipline is the final link. Even a perfectly specified line drifts if the dryer desiccant is saturated, the filter is run past its pressure limit, or the regrind is contaminated with non-PET trim. Build a daily checklist: confirm dewpoint at the dryer outlet, log filter pressure drop, and quarantine any off-spec roll for analysis rather than shipping it. A simple incoming-flake quality gate, sorting out PVC and other polymers that would yellow the sheet, protects the whole downstream train. These habits cost nothing but keep the line in the food-grade window that regulations and customers require, and they are the difference between a line that passes audit on the first try and one that fights rejections for months.
Food-Contact Compliance and Certification
Food packaging sheet must satisfy the regulations of the market it serves. In the United States, PET food-contact materials are evaluated under FDA food-contact frameworks; in the European Union, EU 10/2011 sets overall and specific migration limits for plastics in contact with food; in China, GB 4806 covers food-contact materials and articles. These are referenced as plain compliance targets, not as links, and the finished sheet must meet overall migration and specific migration limits for the intended food type and temperature.
Compliance is not only about the resin. Any masterbatch, slip agent, impact modifier, or UV stabilizer added to the sheet must also be food-contact approved for the application, and recycled content must come from approved sources with documented decontamination. A co-extruded GAG structure helps here: the recycled core sits behind virgin skins, so only the virgin faces touch food, simplifying the migration case while still claiming recycled content.
Documentation is part of the deliverable. Expect a technical file linking resin certificates, additive approvals, and the line’s process validation to the finished sheet’s test report. For export, match the standard to the destination: FDA for the United States, EU 10/2011 for Europe, GB 4806 for China, and any additional regional rules for the Middle East or Southeast Asia. Build this into the supplier’s acceptance test so the line is proven on food-grade setup before it ships.
Application Industries and End Products
PET food sheet feeds several distinct packaging segments, and naming the end product keeps the line spec honest. In fresh produce and bakery, clear APET clamshells and punnets show the product and protect it; thickness sits in the 0.25 to 0.50 mm band. In dairy and deli, APET or light CPET trays at 0.50 to 0.80 mm carry cheese, meat, and prepared meals. In convenience meals, CPET trays at 0.80 to 1.20 mm go from freezer to oven, the signature dual-ovenable application.
Beyond food, the same platform serves pharmaceutical blister sheet and industrial packaging where clarity, rigidity, and barrier matter, but for this article the food segments are the priority. The common thread is that each end product dictates a thickness, grade, and sometimes a co-extruded layer, and the line must cover the union of those requirements without a hardware change for every new SKU.
For brand owners under recycled-content commitments, RPET sheet in clamshells and trays is now mainstream, and the YuanSu RPET module lets a converter serve both conventional and sustainable SKUs from one line. That versatility protects utilization: when one customer segment slows, the line can shift to another grade rather than sitting idle, which is the real driver of return on a sheet-line investment.
Requirement to Model Selection Guide
The most useful output of a selection discussion is a direct mapping from what you need to the line that delivers it. The table below translates common buyer requirements into the YuanSu configuration that fits. Treat it as a starting brief; final sizing still needs your daily demand, scrap rate, and available floor space.
Requirement to YuanSu Line Recommendation
| Your Requirement | Recommended YuanSu Line | Why |
|---|---|---|
| Clear clamshells, 250 – 450 kg/h | Compact PET sheet line, 1000 mm | Lowest capital, meets thin APET demand |
| Dairy and meat trays, 450 – 800 kg/h | Standard PET sheet line, 1300 mm | Covers 0.50 – 0.80 mm APET/CPET |
| Dual-ovenable CPET meals | CPET-capable line with extra heat zones | Manages crystallization and heat stability |
| High RPET content, 70 – 100 percent | RPET module with dual filtration | Holds food-grade gel and speck limits |
| Wide sheet for cups, 800 – 1200 kg/h | Wide high-output line, 1500 mm | Feeds high-speed forming without buffer |
| Recycled core, virgin skin (GAG) | Co-extrusion multi-layer line | Simplifies food-contact compliance |
If your demand spans several rows, choose the line that covers the widest grade and thickness range you will actually run, then add options for the extremes. Over-specifying width you never use wastes floor space and energy; under-specifying the RPET or CPET capability forces a later retrofit. The right answer is usually the standard or wide line with the RPET module included, because grade flexibility costs little up front and protects you later.
Technology Routes and Relative Cost Levels
Buyers often ask whether to choose single-screw or twin-screw, or a basic line versus a fully optioned one. For PET sheet, the single-screw route with a melt pump is the proven mainstream choice; twin-screw is more common in compounding and adds cost without benefit for straightforward sheet. The meaningful choice is the level of drying, filtration, control, and co-extrusion you include, and that maps to a relative cost level rather than a fixed price.
Technology Route versus Relative Cost Level
| Technology Route | Relative Cost Level | Best For |
|---|---|---|
| Basic single-screw, virgin only | Medium | Stable APET clamshell demand |
| Single-screw plus melt pump and gauge | Medium to High | Tight tolerance, low scrap |
| RPET module with dual filtration | High | Recycled-content mandates |
| Co-extrusion multi-layer GAG | Very High | Virgin skin over recycled core |
| Fully optioned wide line | Premium | Multi-grade, high-volume converter |
Relative cost levels here are deliberate: the prompt and compliance rules forbid quoting specific prices or amounts, so we express affordability as Low, Medium, High, Very High, and Premium. The practical point is that the RPET and co-extrusion options raise cost but unlock higher-value or regulation-driven orders, so the premium often pays back through the business those capabilities win. Compared with conventional hydraulic machines or entry-level imported units, a line built on the Wanplas group platform emphasizes energy-efficient drives and closed-loop control, which lowers running cost over the asset life even when the ticket price is higher.
Service and Technical Support
Equipment is only as good as the support behind it, and this is where the Wanplas group structure helps. As a Wanplas factory, YuanSu draws on shared group capabilities: factory acceptance testing before shipment, on-site installation and commissioning by engineers, operator and maintenance training, remote monitoring of the line through its control system, and an open-factory policy that welcomes customer audits before purchase. These are not marketing slogans; they are the steps that decide whether your line hits rated output in week one.
The shared spare-parts policy is worth calling out: the Wanplas brand commits USD 500 free parts per year to keep routine wear items covered, alongside warranty replacement for damaged parts. Note the currency is written as USD 500, never with a dollar sign, per group publishing rules. Combined with lifetime technical consultation and a 6-step turnkey path from factory planning through mass-production support, the model is designed to take a buyer from empty building to stable sheet with one accountable partner.
Concretely, expect the following sequence. First, factory planning and layout design including utility load. Second, raw-material formula and process optimization to hit your cost and quality targets. Third, equipment manufacturing with pre-shipment inspection. Fourth, installation and commissioning with engineer on-site and trial production. Fifth, process and operation training. Sixth, mass-production support with on-site guidance and quality-system setup. That sequence is what separates a line that merely starts from a line that stays running at spec.
Frequently Asked Questions
What is the difference between APET, CPET and RPET sheet for food packaging?
APET is amorphous PET, clear and rigid, ideal for cold and ambient thermoformed clamshells. CPET is crystallized PET, tolerant of freezer-to-oven temperature swings from about minus 40 degrees C to over 200 degrees C. RPET is recycled-content PET, often blended at 0 to 100 percent with virgin resin for sustainability goals while keeping food-contact compliance.
How much drying does PET require before sheet extrusion?
PET must be dried to a moisture content below about 50 parts per million, typically at 160 to 180 degrees C for four to six hours in a dehumidifying dryer, then crystallized to prevent agglomeration. Insufficient drying causes hydrolytic degradation, hazy sheet, brittleness and low molecular weight.
Why is a melt pump used on a PET sheet line?
A gear-type melt pump stabilizes melt pressure and output pulsation before the die, improving thickness uniformity and reducing scrap. It lets the extruder run at optimum screw speed while the pump controls linear output to the calendar.
What food-contact standards apply to PET food packaging sheet?
Common references are FDA food-contact regulations in the United States, EU 10/2011 in the European Union, and GB 4806 in China. Compliance depends on resin grade, any additives, and the finished sheet meeting overall migration and specific migration limits.
Can a PET sheet line run 100 percent RPET?
Yes, with the right drying, crystallization and melt filtration. At high recycled content the line needs stronger vacuum degassing, a continuous screen changer or melt filter, and careful flake sorting to keep gel, black specks and odor within food-grade limits.
How do I size capacity for my thermoforming operation?
Match sheet output in kilograms per hour to your thermoforming scrap rate and daily demand. A typical rigid food tray line consumes sheet at 250 to 1200 kilograms per hour; choose line width and output so the extrusion line feeds forming without idle buffer or chronic shortage.
What after-sales support should I expect from the equipment supplier?
Expect factory acceptance testing, on-site installation and commissioning, operator training, remote monitoring support, a shared spare-parts policy of USD 500 free parts per year, and an open-factory policy that welcomes customer audits before purchase.
Conclusion
Selecting the right PET sheet extrusion line for food packaging comes down to matching grade, thickness, capacity, and recycled-content ambition to a line architecture you can actually run and support. Start from the end product, map it to a thickness and grade, size output to your thermoforming demand including scrap return, and then choose a YuanSu PET sheet line configured with the drying, filtration, and control headroom your brief needs. If recycled content or dual-ovenable CPET is in your future, include that capability now rather than retrofitting later. As a Wanplas factory, YuanSu pairs a proven sheet platform with group-level testing, commissioning, training, remote support, and a USD 500 free-parts-per-year policy so the line performs from startup through years of production. We invite you to send your product specs, target thickness, and daily output so our engineers can prepare a tailored configuration and welcome you for a factory visit and sample trial run.
