#1 Raw Materials for Making Plastic Bottles

The core raw materials for plastic bottle production are resin pellets (e.g., PET, PETG, PP), paired with functional additives — color masterbatch for tinting, UV stabilizers for durability, and recycled content for sustainability. Formulations adapt to end - use needs: food - grade resins meet safety standards, impact - resistant blends integrate toughening agents, and bio - based polymers (e.g., PLA) or rPET enable eco - friendly designs.

#2 Batching & Pre - mixing for Plastic Bottles

Resin pellets (e.g., PET, HDPE) and functional additives (color masterbatch, UV stabilizers) are first dried to remove moisture (critical for clarity and strength). They’re then fed into a loss - in - weight dosing system, which dispenses precise ratios into high - speed mixers.

This pre - mixing stage ensures uniform distribution of additives. Batch size is calibrated to match production volume and mold capacity, while resin moisture content and additive dispersion are tightly controlled — key to avoiding defects like haze or inconsistent performance.

#3 Plastic Resin Melting & Conditioning

Resin pellets (e.g., PET, PP) are fed into a screw - extruder, where staged heating (180–280°C, varying by resin type) and mechanical shear melt them into a uniform fluid. Unlike glass, moisture in pellets is first removed via dehumidification (to avoid bubbles/cracking), while additives (e.g., UV stabilizers) blend uniformly during melting.

Our extrusion lines use smart temperature - control systems, with AI - driven software optimizing melt viscosity for consistent forming — managed remotely by process engineers.

#4 Plastic Bottle Forming Processes

Plastic bottle formation begins with injection - molding preforms: molten resin is injected into cooled molds to create tube - shaped preforms (with built - in threads for caps). These preforms are then sorted and fed into blow - molding systems.

The final shape is achieved through two key methods: Injection Blow Molding (IBM) for wide - mouth containers (e.g., jars, buckets) and Stretch Blow Molding (SBM) for narrow - neck bottles (e.g., beverage, skincare bottles).

Stretch Blow Molding (SBM)

In SBM, preforms are reheated (targeting the body area), then stretched by a rod while air pressure expands them against the mold. This biaxial stretching aligns molecules, enhancing strength and clarity — perfect for PET bottles needing durability and transparency.

#5 Post - Processing for Plastic Bottles

After forming, plastic bottles are first trimmed (laser or mechanical) to remove flash. They then enter a heat - setting tunnel, where gradual temperature cycling (60–180°C, resin - specific) relieves stress from molding/stretching and locks in shape stability.

Key post - processes include:

Surface activation (corona/plasma) for label adhesion Sterilization (UV/hydrogen peroxide for food/medical grades) Leak testing via pressure/vacuum checks

We control these steps to:

• Ensure shape consistency
• Reduce internal stresses
• Boost functional compatibility (printing, sealing)

#6 Plastic Bottle Surface Finishing

Surface finishes on plastic bottles blend branding versatility with functional innovation. Leveraging plastic - specific techniques (digital printing, in - mold labeling, etc.), we deliver treatments for aesthetics, durability, and user experience — backed by advanced equipment and tailored expertise.