PET Wankai WK‑801

PET Zhejiang Wankai WK‑801 is a high‑transparency polyester plastic with high rigidity, low acetaldehyde content, excellent drop‑resistance and barrier performance.

Main Applications

Beverage packaging: mineral‑water bottles, carbonated‑drink bottles, tea‑drink bottles. Food containers: condiment bottles, edible‑oil bottles, sauce jars. Daily‑chemical packaging: cosmetic bottles, shampoo bottles, detergent bottles. Pharmaceutical packaging: oral‑liquid bottles, tablet bottles (additional certification required).

Physical Properties

Property Category	Test Standard	Unit	Typical Value WK‑801
Basic Properties
Density	ASTM D792	g/cm³	1.33‑1.38
Intrinsic Viscosity (IV)	ISO 1628‑5	dL/g	0.80±0.02
Mechanical Properties
Tensile Strength	ASTM D638	MPa	55‑70
Elongation at Break	ASTM D638	%	100‑200
Flexural Modulus	ASTM D790	MPa	2500‑2800
Notched Impact Strength (23℃)	ASTM D256	J/m	30‑45
Thermal Properties
Melting Point (DSC)	ISO 11357	℃	250‑260
HDT (0.45 MPa)	ASTM D648	℃	70‑80
Optical & Sanitary Properties
Light Transmittance (2 mm)	ASTM D1003	%	≥90
Acetaldehyde Content	GC method	ppm	≤1.0
Heavy‑metal leaching	GB 31604.9	mg/kg	＜0.01

Blow‑molding Process

Process Step	Parameter Range	Key Control Points
Pre‑drying
Drying temperature	150‑165℃	Moisture content ＜0.005% is mandatory
Drying time	4‑5 h	Dew point ≤‑40℃
Extrusion blow‑molding temperature
Barrel zone 1	240‑250℃	Prevent thermal degradation & acetaldehyde generation
Barrel zone 2	255‑265℃
Barrel zone 3	265‑275℃
Die‑head temperature	270‑280℃
Mold temperature	10‑30℃	Low‑temperature fast cooling for high transparency
Pressure parameters
Parison pressure	20‑35 MPa	Avoid uneven wall‑thickness
Blow pressure	0.8‑1.5 MPa	Stable pressure to prevent deformation
Cycle time
Cooling time (500 ml bottle)	2‑5 s	Too short‑easy deformation; too long‑low efficiency

Note: All information above is for reference only!