Engineered raw materials designed for injection molding, medical grade extrusions, rigid thermoforming, and decorative applications.
In contemporary industrial manufacturing, raw polymer processing represents the foundational baseline for global manufacturing quality. Precision engineered plastic pellets (granules) serve as the primary feedstocks across diverse converting processes, including melt extrusion, injection molding, blow molding, and multi-layer calendering. Modern industrial buyers and chemical engineers no longer treat polymer resin purchasing as a commodity transaction; instead, procurement decisions hinge on physical stability, melt flow consistency, exact plasticizer migration control, thermal stabilization, and strict regulatory compliance.
High-quality producing plastic pellet manufacturers utilize specialized co-rotating twin-screw extruders and automated melt filtration systems to process raw Polyvinyl Chloride (PVC), Polyethylene (PE), Polypropylene (PP), and Ethylene-Vinyl Acetate (EVA) resins into standardized uniform pellets. This rigorous thermal processing converts virgin or recycled polymer bases into high-value compounds tailored for demanding end-use markets such as medical device manufacturing, automotive interior components, clear thermoformed blister packaging, and technical footwear soles.
The technical advantage of primary compound pelletization lies in phase dispersion. Direct powder processing often yields inconsistent viscosity profiles, volatile outgassing, and localized optical defects. By pre-compounding additives—such as non-phthalate plasticizers (DOTP, DINP), non-toxic Calcium-Zinc (Ca/Zn) thermal stabilizers, optical clarifyers, and UV inhibitors—into continuous pellet matrices, manufacturers grant downstream converters plug-and-play material stability, reducing process scrap by up to 35%.
Founded in 1996, Jiangsu Dahai Plastics Co., Ltd. stands as a benchmark enterprise in East China’s polymer synthesis and film manufacturing sector. Operating as a premier private technology enterprise, Dahai Plastics integrates large-scale industrial compounding with high-precision sheet calendering and specialized granule production. Spanning an expansive manufacturing footprint of over 120,000 square meters, the company maintains total group assets exceeding $140 million USD and a total registered capital base of $40 million USD.
Driven by continuous technological modernization, Dahai Plastics houses more than 20 advanced environmental production lines operated by a workforce of over 450 skilled employees. Crucially, over 30% of the staff consists of specialized technical management personnel and polymer engineers, establishing a robust E-E-A-T (Experience, Expertise, Authoritativeness, and Trustworthiness) ecosystem across every phase of synthesis and compounding.
Annual sales exceed 1 Billion RMB ($180 Million USD), with over $10 Million in international exports reaching over 10 countries and regions across South America, Southeast Asia, and Africa, while supplying 400+ cities in China.
In response to global health supply demands, Dahai has strategically invested in state-of-the-art intelligent manufacturing projects focusing on bio-compatible medical polymers, ENFit enteral feeding bag films, and sterile urine collection materials.
Features an internal CNAS-standard testing laboratory equipped with Agilent GC analyzers, Universal Mechanical Testers, digital spectrophotometers, and low-temperature impact chambers for absolute quality assurance.
"Make green materials, create a good and healthy life!" — Dedicated to developing eco-friendly, non-toxic polymer formulations that protect both consumers and the global environment.
"To become the domestic polymer material application industry leader, to build a world-class brand!"
"Independent innovation, intelligent future! Team style: People-oriented, safety first!"
"Integrity, pragmatic, efficient, win-win!"
The production of high-performance PVC granules and polymer pellets requires meticulous physical-chemical calibration. Melt Flow Index (MFI), Shore A/D durometer hardness, tensile elongation, and plasticizer migration parameters must be optimized based on final converting equipment specifications.
At Dahai Plastics, polymer raw materials undergo a multi-stage thermal transformation designed to ensure melt homogeneity and prevent thermal degradation:
| Stage | Process Description | Critical Parameters | Quality Verification Standard |
|---|---|---|---|
| 1. High-Speed Dry Blending | PVC resin suspension combined with plasticizers, Ca/Zn stabilizers, and lubricant packages. | Temperature: 115°C - 125°C; High-shear vortex agitation. | Homogeneous dry blend liquid absorption; zero clumping. |
| 2. Twin-Screw Extrusion | Co-rotating intermeshing screws melt, shear, and degas the compound under high pressure. | L/D Ratio 36:1 to 40:1; Multi-zone heating (150°C - 185°C). | Degassing vacuum pressure < -0.09 MPa; uniform melt density. |
| 3. Die-Face Hot Granulation | Melt extruded through precision circular multi-hole dies and sliced by high-speed rotating cutters. | Water-ring cooling temp: 25°C - 35°C; Cutter speed synchronized to melt pressure. | Pellet Geometry: 3.0mm x 3.0mm cylindrical/spherical uniform cuts. |
| 4. Vibratory Fluid Bed Drying | Pellets conveyed through air-fluidized cooling channels to eliminate surface moisture and prevent agglomeration. | Cooling airflow temp < 30°C; Moisture content target < 0.1%. | Zero pellet blocking; Moisture testing via Karl Fischer titration. |
Different application downstream sectors demand specific mechanical profiles. The table below outlines standard target values across our key granule formulations:
| Granule Compound Grade | Hardness (Shore) | Tensile Strength (MPa) | Elongation at Break (%) | Primary Applications |
|---|---|---|---|---|
| Medical Translucent Soft PVC | 65A - 80A | ≥ 16.5 MPa | ≥ 380% | ENFit enteral feeding bags, urine drainage bags, blood tubing. |
| High-Clear Footwear Sole Granules | 60A - 70A | ≥ 14.0 MPa | ≥ 400% | Crystal shoe soles, rain boots, durable outer footwear. |
| Rigid Thermoforming PVC Pellets | 75D - 85D | ≥ 45.0 MPa | ≥ 120% | Pharma blister films, technical rigid sheets (0.15mm - 0.8mm). |
| Flexible General Film Grade | 70A - 85A | ≥ 18.0 MPa | ≥ 350% | Super transparent PVC rolls, bath curtains, inflatable boat skins. |
Custom resin solutions tailored for stringent regulatory, physical, and aesthetic application environments worldwide.
Formulated for medical single-use items, ENFit enteral feeding bags, liquid drainage systems, and soft medical sheet calendering with non-DEHP plasticizers.
Rigid PVC compounds, SPC vinyl flooring wear layers, decorative laminated glass EVA films (1.14mm), and architectural protective membranes.
High-clarity, non-toxic PVC resins designed for toy casting, bath accessories, inflatable boats, and child-safe flexible consumer items.
Extrusion-ready soft PVC granules and super clear film rolls for high-grade zipper bags, waterproof pouches, and protective daily necessities.
When enterprise procurement teams select polymer pellet manufacturers, Total Cost of Ownership (TCO) extends beyond raw material price per metric ton. Unplanned line downtime, nozzle clogging from gel particles, color shifting during thermal processing, and batch non-compliance can escalate manufacturing losses exponentially.
Every polymer batch produced by Jiangsu Dahai Plastics undergoes rigorous lab verification to comply with target market standards worldwide.
To support seamless global trade, Dahai maintains an advanced internal laboratory accredited according to CNAS standards. Testing equipment includes Agilent GC analyzers, digital gloss meters, universal tensile test rigs, and cold-tolerance testing chambers. Our compound formulations strictly satisfy the following international standards:
Strict exclusion of heavy metals (Pb, Cd, Hg, Cr VI) and SVHC (Substances of Very High Concern), ensuring frictionless entry into European markets.
Safety compliance standards for toy manufacturing, guaranteeing non-phthalate formulations safe for child-contact applications.
Model Toxics in Packaging Legislation compliance, certifying that total combined heavy metal concentrations remain below 100 ppm.
Technical insights regarding polymer compounding, MOQs, custom color matching, and global logistics.
For standard transparent and general-purpose extrusion PVC granules, our baseline MOQ starts at 5 Metric Tons. For highly specialized custom-formulated compounds (such as medical non-DEHP grades or specific Pantone-matched translucent colors), our production minimum is typically 10 Metric Tons to accommodate twin-screw purge cycles and CNAS laboratory calibration tests.
We employ continuous loss-in-weight gravimetric feeders on our 20+ automated extrusion lines, maintaining ingredient dosing accuracy within ±0.2%. Every production lot undergoes automated color spectrophotometry testing (Delta E < 0.5) and melt flow index (MFI) verification in our CNAS-certified testing facility before warehouse release.
Yes. All Dahai eco-friendly PVC compound series are formulated using environmental Calcium-Zinc (Ca/Zn) thermal stabilizers and REACH-compliant plasticizers (such as DOTP, DINP, or bio-based esters). Our products strictly adhere to EU RoHS directives, EN-71, ASTM-F-963, and CONEG packaging regulations.
We offer multiple heavy-duty export packaging configurations: 25kg multi-layer kraft paper bags with moisture-proof PE liners, 1,000kg bulk woven jumbo bags (FIBC), and octabin corrugated containers with automated foil sealing for long-distance ocean shipping.
Delivering high-performance polymer compounds to leading manufacturers across North America, Europe, Asia-Pacific, and South America.
Explore our full line of clear compound granules, medical-grade films, rigid sheets, and footwear material solutions.
Dahai Plastic
