PET resin YS-W01 is a bottle-grade polyethylene terephthalate granulate supplied for reheat stretch blow moulding and injection blow moulding operations. The downstream application scenarios below are restricted to packaging categories in which the nominal intrinsic-viscosity specification of 0.80 ± 0.02 dL/g and the acetaldehyde limit of ≤1.0 ppm are used directly. Processing values are stated as typical industrial windows reported in machinery technical bulletins and polymer conversion literature; they require validation on the specific line because dryer residence time, hot-runner balance, and mould cooling circuits modify local thermal history.

Carbonated Beverage Bottles Under High-Pressure CO₂ Retention

In carbonated soft drink lines, YS-W01 is injection moulded into preforms and reheat stretch blow moulded into containers intended to retain internal CO₂ partial pressures of 0.35–0.45 MPa at 20 °C, with bottle burst pressure typically above 1.2 MPa when sidewall thickness and base geometry conform to preform design calculations. Direct food-contact compliance is anchored to FDA 21 CFR §177.1630, EU 10/2011 overall migration limits of ≤10.0 mg/dm², and GB 4806.7-2016 for China market conformity. Formulation addition ratios in the preform feed are commonly 100 wt% virgin YS-W01 where brand-owner specifications prohibit post-consumer recycled input; where qualified, up to 30 wt% food-grade rPET is blended with 70 wt% YS-W01, provided the rPET retains an intrinsic viscosity above 0.72 dL/g after solid-state polycondensation and passes acetaldehyde challenge testing. Downstream production begins with dehumidifying drying at 165–175 °C for 4–6 h to a moisture target below 50 ppm; feed throat temperature is held at 60–80 °C to prevent regranulation and moisture reabsorption. Preform injection uses a screw with L/D ratio 24:1 and compression ratio 2.5:1–3.0:1, melt temperatures of 270–290 °C, injection pressure 120–160 MPa, and holding pressure 70–100 MPa; hot-runner temperature uniformity is maintained within ±2 °C across 48 to 96 cavities to avoid differential crystallinity and gate vestige variation. The upper melt-temperature limit is set by acetaldehyde generation, which increases sharply above 290 °C, while the lower limit is set by incomplete plastication and higher screw torque on high-cavity tools. Blow moulding applies axial stretch ratios of 2.5–3.0 and hoop stretch ratios of 3.0–3.5, with preform surface temperatures between 95 °C and 110 °C and blow pressures of 3.0–4.0 MPa. Preform IV retention is monitored after injection; a drop greater than 0.02 dL/g indicates hydrolytic degradation from residual moisture or excessive thermal history. Terminal finished product types include 330 mL, 500 mL, 1.0 L, 1.5 L, and 2.0 L CSD bottles with petaloid or champagne base geometries and nitrogen-purged filling lines.

In aseptic still water filling lines, preform design is driven by light-weighting and acetaldehyde migration into packaged water rather than internal pressure retention. Food-contact compliance for still water packaging is evaluated under EU 10/2011 and FDA 21 CFR §177.1630, with finished article migration testing referenced to EN 1186-1 and EN 13130-1. Typical formulation addition ratios are 100 wt% virgin YS-W01 for standard still water bottles, or 50 wt% YS-W01 blended with 50 wt% bottle-grade rPET where national food-contact authorisations and brand specifications permit rPET; the blend requires online melt filtration of the rPET stream and verification of intact physical properties after drying. Downstream production involves dehumidifying drying at 160–170 °C to ≤50 ppm moisture, then injection moulding at melt temperatures of 270–285 °C; screw recovery and holding pressure profiles are adjusted to preform wall-thickness distribution to prevent sink marks and sidewall thickness variation above ±0.05 mm. Stretch blow moulding for light-weight water bottles uses preform surface temperatures of 100–112 °C and blow pressures of 2.5–3.5 MPa; mould venting is configured to reduce trapped-air haze. Terminal finished product types include still water bottles from 200 mL to 20 L carboys, with the volume range above 10 L typically produced on two-stage reheat-blow machines with handle-compatible base inserts or integrated carry-handle preform designs.

Why Do Edible Oil Fillers Specify Low Acetaldehyde Bottle Resin?

Edible oil filling lines use PET bottles for olive, sunflower, groundnut, and blended cooking oils where lipid oxidation is limited by packaging that contributes minimal acetaldehyde, low migratory oligomers, and controlled antimony release. The applicable direct food-contact standards are FDA 21 CFR §177.1630, EU 10/2011, and GB 4806.7-2016; specific migration of antimony is monitored under EN 1186-14 and GB 31604.41-2016 at accelerated time-temperature conditions. Formulation addition ratios are commonly 100 wt% YS-W01 for ambient-fill oils requiring long shelf life, or 70–80 wt% YS-W01 blended with 20–30 wt% food-grade rPET where national regulation permits rPET in fatty food contact and the oil brand has completed migration screening. Downstream processing uses extruder melt temperatures of 265–280 °C, preform injection followed by reheat blow moulding, and controlled preform storage not exceeding 72 h before blowing unless moisture-barrier packaging is used; preforms held beyond 72 h are re-dried to ≤50 ppm moisture. Because edible oil does not require high CO₂ barrier, blow moulding orientation is often reduced: axial stretch is lowered to 2.2–2.7 and hoop stretch to 2.8–3.3, which reduces orientation-induced stress in the neck and sidewall and improves drop-impact performance at 18–25 °C fill temperatures. Terminal finished product types include 500 mL, 1 L, 2 L, and 5 L cooking oil bottles, with handle-equipped designs in the 2–5 L range produced on shuttle blow moulding machines or integrated ISBM lines with handle inserts.

Controlling Heat-Set Crystallinity in Hot-Fill Juice and Tea Bottle Production

Hot-fill juice, tea, and sports drink bottles require a heat-set blow moulding sequence that deliberately builds sidewall crystallinity to resist panelling and volume shrinkage after filling at 85–88 °C. Food-contact compliance follows FDA 21 CFR §177.1630, EU 10/2011, and GB 4806.7-2016; migration testing under EN 1186-1 and EN 13130-1 is performed at hot-fill temperature conditions. Formulation addition ratio is usually 100 wt% virgin YS-W01 because rPET content above 30 wt% can widen the heat-set temperature window and increase variability in final crystallinity; where used, food-grade rPET is limited to 20–30 wt% and requires SSP-based intrinsic viscosity above 0.76 dL/g. Downstream production starts with dehumidifying drying to ≤50 ppm moisture, followed by preform injection at melt temperatures of 270–285 °C. Reheat blow moulding is then conducted in moulds held at 120–145 °C; preform surface temperature is stabilised at 105–115 °C before blowing, and the blown bottle is held against the heated mould for 1.5–3.0 s to develop sidewall crystallinity in the target range of 30–35 %. The process conflict lies in the upper mould temperature limit: above 145 °C, PET crystallisation can proceed too rapidly, causing haze and sidewall shrinkage, while below 120 °C, heat-set crystallinity is insufficient and vacuum panels may deform inward after hot fill. Thick sidewall regions such as the neck ring and base push-up are more prone to crystallinity gradients; cooling after demoulding is controlled to below 60 °C to freeze orientation. Terminal finished product types include 300 mL, 500 mL, 1 L, and 2 L hot-fill juice, tea, sports drink, and functional beverage bottles, often with vacuum panel sidewall geometry or panel-less design using nitrogen dosing or sidewall ribbing.

For personal care and household chemical containers, YS-W01 is used in injection stretch blow moulded bottles where surface gloss, neck thread dimensional stability, and compatibility with mild surfactant and fragrance formulations are specified. Non-food packaging compliance is generally benchmarked against REACH Annex XVII for restricted substances and Directive 94/62/EC, Annex II for packaging heavy metal limits; where the bottle is intended for cosmetic product contact, suitability is reviewed under Regulation (EC) No 1223/2009, Article 17 as part of the cosmetic product safety assessment. Formulation addition ratios are 100 wt% virgin YS-W01 for transparent bottles requiring high drop resistance, or 50–80 wt% YS-W01 blended with 20–50 wt% non-food-approved rPET where no food-contact claim is made. Downstream production typically uses preform injection at melt temperatures of 260–275 °C, followed by reheat blow moulding; preform neck specifications for 24/410 and 28/410 closures require holding pressure control to avoid thread root ovality above 0.3 mm. Terminal finished product types include 250 mL, 500 mL, and 1 L bottles for shower gels, hair care products, liquid hand soap, and hard-surface cleaners.

When Pharmaceutical Containers Require Injection Blow Moulding Without Barrier Overmoulding

For oral solid and liquid pharmaceutical packaging, YS-W01 is processed into thick-walled bottles via injection blow moulding where low extractables and controlled surface finish are primary. Compendial compliance is assessed under USP <661.1> and Ph. Eur. 3.1.15, with material test data generated according to USP <661.2> for plastic packaging systems; finished container elemental impurity risk assessments follow ICH Q3D when required by the drug product file. Formulation addition ratio is 100 wt% virgin YS-W01; post-consumer recycled PET is not used in regulated pharmaceutical primary packaging unless a specific regulatory authorisation exists for that drug product and closure system. Downstream production involves drying at 160–170 °C to ≤50 ppm moisture, injection of preforms at melt temperatures of 260–275 °C, and blowing at preform surface temperatures of 100–115 °C; injection blow moulding tooling requires core-rod temperature control to avoid parison sticking and splitting, with clamp force scaled to parison core length and cavity count. Terminal finished product types include 20 mL to 200 mL syrup bottles, 30 mL to 150 mL oral liquid dosing bottles, and desiccant-lined tablet bottles in 30 mL to 250 mL sizes; child-resistant closure systems are validated under ISO 8317 protocols where the finished drug package requires certified child-resistance.