Reinforcement-free injection molding of Chimei KIBISAN SAN PN-117L200 for transparent blender jars, food-processor bowls, and juice collector cups begins with desiccant drying to 0.05 wt-% residual moisture. The pellets are processed on a reciprocating screw machine with a single-flight general-purpose screw having 20:1 L/D and compression ratio 2.4:1; barrel settings from rear to nozzle are 210/215/220/225 °C, and the melt temperature measured at the nozzle is controlled at 220 ±5 °C. Material lot acceptance includes melt volume-flow rate at 220 °C/10 kg by ISO 1133-1:2022; production lots are held within a ±4 cm³/10 min window around the supplier certificate value to maintain fill reproducibility. For a 2.3 mm nominal wall, the mold temperature is held at 55–65 °C, injection velocity is set to 180–220 mm/s, and packing pressure is maintained at 60–70 bar for 3.5–4.0 s. A direct-edge gate with land length 1.0 mm and thickness equal to 65% of the wall creates a melt front without jetting; the resulting light transmittance is 88% or higher at 2.3 mm when tested to ASTM D1003-13, with haze below 2.0%. The standard formulation is 99.7 wt-% PN-117L200, 0.2 wt-% internal mold release, and 0.1 wt-% hindered phenolic antioxidant; no impact modifier is used because rubber modification reduces transmittance below 80%. For repeated food-contact service, finished articles are tested under FDA 21 CFR 177.1040 and EU Regulation 10/2011; total migration in 10% ethanol at 40 °C for 10 days and in 3 wt-% acetic acid at 70 °C for 2 h remains below 10 mg/dm². A 1.5 L blender jar with 620 g shot weight typically requires 1,800–2,200 kN clamp force and a cooling time of 24–28 s before ejection is triggered at a part surface temperature below 80 °C.

What Limits PN-117L200 in Cosmetic Closure Thread Forming When Fragrance Esters Are Present?

Fragrance-containing cream-jar closures, serum caps, and outer caps for lipstick tubes are molded from this SAN grade only when the packaged formula has an ester solvent content below 8 wt-% or when a liner isolates the polymer from the product. Benzyl acetate, linalool, limonene, and dipropylene glycol monomethyl ether diffuse into SAN and lower the critical strain for environmental stress cracking; in-plant validation is required because published data for specific fragrance mixtures is limited. Thread design uses a rounded buttress profile with a root radius at least 1.5× the wall thickness rather than a sharp ISO metric V-thread, reducing notch stress at the thread root. A 2.0 mm wall closure with M43 buttress thread is molded in a valve-gated hot runner; pack pressure is set to 55–65 bar for 0.8 s to replicate thread apexes without overpacking. Mold temperature is kept at 45 °C to limit cycle time, but ejection is delayed until the thread root surface reaches 70 °C; early ejection below that temperature produces radial microcracks in the root. Post-mold annealing at 70 °C for 30 min lowers molded-in stress and improves thread root resistance. The compound is 99.8 wt-% PN-117L200 with 0.2 wt-% amide-based slip additive; no plasticizer is used because plasticizer migration into the cosmetic is unacceptable. Under EU Regulation 1223/2009, packaging compatibility is assessed as part of cosmetic product safety, and closure compatibility with the finished cosmetic is verified by extended contact tests at 40 °C for 30 days rather than by short-term immersion alone. The absence of heavy metals is confirmed by IEC 62321 screening.

A separate downstream segment is interior control-panel lenses for air purifiers, HVAC remote displays, and home-appliance touch interfaces, where PN-117L200 is compounded with ultraviolet stabilizers and processed under high-gloss cavity conditions to avoid visible flow lines across the display window. Pre-compounding is carried out on a co-rotating twin-screw extruder with 40 L/D at 190–210 °C, 300 rpm, and 15 kg/h throughput to disperse the UV stabilizer. The blend is 99.5 wt-% PN-117L200, 0.3 wt-% 2-(2H-benzotriazol-2-yl)-p-cresol ultraviolet absorber, 0.15 wt-% hindered amine light stabilizer, and 0.05 wt-% optical brightener, pre-dried at 80 °C for 4 h before molding. A 1.5 mm lens is molded with melt temperature 225 ±5 °C, hot-runner tip temperature 230 °C, and mold temperature 70 °C to reproduce the high polish of the cavity; gate sequencing from the non-visible edge prevents a weld line in the display area. Ultraviolet ageing is evaluated to ASTM D4459-21 with 500 h exposure in a xenon arc apparatus, and the change in yellowness index is held below 3.0. Flame retardance of unmodified PN-117L200 is limited; at 1.5 mm thickness the material is rated HB in the IEC 60695-11-10 glow-wire ignition test, so lens geometry must be separated from live parts by the clearance and creepage distances required in IEC 60335-1. The terminal parts are air-purifier control dial lenses and HVAC display covers.

Cold-Water Carafe and Filter Housing Processing Without Post-Mold Annealing

Transparent cold-water carafe bodies, coffee-maker water tanks, and filter housings are produced from neat PN-117L200 using a cold-runner two-plate mold when the service fluid remains below 65 °C and cleaning agents are limited to neutral aqueous solutions. The material is not recommended for continuous hot-water pressure vessels because the modulus retention curve and hydrolytic ageing boundary for this SAN grade are not established above 65 °C; published data for this specific configuration is limited. A 2.8 mm wall carafe is gated with a fan gate from the base to avoid visible gate blush above 0.5 mm depth. Processing uses barrel temperatures 205/210/215/220 °C, mold temperature 60 °C, packing pressure 70 bar for 5 s, and cooling time 28–32 s. For a 1.2 L carafe, clamp force is 2,000–2,400 kN. Because mold temperature is above 55 °C, post-mold annealing is unnecessary; transparent parts can be moved directly to ultrasonic welding of the base ring without warpage exceeding 0.3 mm across 150 mm length. Potable water contact is evaluated under NSF/ANSI 61 or the corresponding regional regulation; migration testing under EU Regulation 10/2011 for repeated use is documented for the neat resin.

If PN-117L200 Is Extruded Into High-Clarity Sheets for Stationery Products, Chill-Roll Temperature Sets the Haze Floor

Sheet extrusion of PN-117L200 for transparent file folders, ruler stock, refrigerator shelf trims, and control-panel inlays is run on a single-screw extruder with 30 L/D, a barrier screw, and a 240 mm flat die. A formulation of 99.8 wt-% PN-117L200 and 0.2 wt-% processing aid is dried to 0.05 wt-% moisture; die exit melt temperature is 220 °C. The three-roll stack is set with top roll 85 °C, middle roll 75 °C, and bottom roll 65 °C. If the top roll falls below 70 °C, the SAN surface solidifies before contact replication is complete, and haze exceeds 3% at 1.2 mm sheet thickness when measured to ASTM D1003-13. For thin sheet below 0.8 mm, line speed must be reduced to keep contact time above 0.6 s on the top roll. Printed and die-cut sheet stock is RoHS-compliant under Directive 2011/65/EU and screened for SVHCs under REACH. The terminal article is high-clarity file-folder stock or a refrigerator shelf trim profile.

When Insert Molding Metal Threaded Sleeves Into Cosmetic Collars, What Prevents PN-117L200 Cracking?

Insert molding of PN-117L200 around knurled aluminum or brass sleeves for cosmetic collars and detachable lipstick tubes requires the metal insert to be preheated to 110 °C before placement. A cold insert at 25 °C quenches the adjacent melt, creating a high-temperature gradient that drives hoop stress into the SAN collar and produces radial cracks within 24 h. The molded collar wall is 2.0 mm; the metal sleeve has a knurl depth of 0.2 mm and an interference region not exceeding 0.1 mm. Barrel temperature is limited to 210–220 °C, and injection fill is slowed to 100–140 mm/s to prevent metal-to-metal gate impingement wear. The assembled part is stress-relieved at 70 °C for 45 min before threading onto the jar; this anneal reduces residual tensile stress below 2 MPa as verified by solvent-stress testing in accordance with ASTM D638-14 using a 0.3% strain fixture and methanol immersion. Published data for the specific metal-SAN interface is limited; pre-production capability runs are used to establish the actual crack-free processing window for each collar design.