Blow‑Molding Equipment
Blow‑Molding Equipment
Multiple domestic factories for bidding. Free promotion. Price to be negotiated between winning bidder and buyer.
Please provide below information for posting:
- New or used; 2. Machine model or product capacity; 3. Screw diameter; 4. Output requirement; 5. Brand scope requirement; 6. Purchase quantity
表格
| Type | Working Principle | Core Advantages | Main Limitations | Typical Applications |
|---|---|---|---|---|
| Extrusion Blow‑Molding Machine | Extruder continuously or intermittently extrudes tubular parison; mold closes and parison is inflated for forming. | Low equipment & mold cost; capable of ultra‑large articles up to 10000 L; suitable for irregular‑shaped and multi‑layer parts. | Post‑processing for flash removal required; moderate neck‑precision; feedstock must possess sufficient melt strength. | Chemical drums above 10 L, automotive air ducts, toys, multi‑layer engine‑oil bottles. |
| Injection Blow‑Molding Machine | Preforms are injection‑molded at injection station; hot preforms are transferred to blow‑molding station for inflation. | Superior dimensional accuracy especially for bottle necks; flash‑free, no trimming required; high‑volume production for small precision containers. | Large capital investment; two sets of molds (injection mold + blow mold); not fit for handled or highly irregular parts. | Pharmaceutical bottles, cosmetic bottles, food‑seasoning bottles and other small‑volume precision containers (normally ＜500 ml). |
| Stretch Blow‑Molding Machine | Axial stretching is applied on extruded or injection‑molded preforms to achieve biaxial orientation. | High mechanical strength, excellent transparency and gas tightness; ideal for carbonated‑drink packaging; high productivity. | Highest investment cost, sophisticated process control; special material requirements e.g. PET. | PET beverage bottles (mineral‑water, carbonated drinks), wide‑mouth jars, heat‑resistant bottles. |
Stretch blow‑molding machines are classified into one‑step and two‑step according to whether preform manufacturing and stretch‑blowing are completed on one machine. ‑ One‑step: high integration, compact footprint, preferred for dedicated production plants. ‑ Two‑step (injection‑molded preform + separate stretch‑blower): extremely high throughput and flexible logistics; current mainstream for PET‑bottle manufacturing.
Key Sub‑classification for Extrusion Blow‑Molding: Continuous vs Intermittent
表格
| Type | Working Principle | Core Features | Application Scenarios |
|---|---|---|---|
| Continuous Extrusion Blow‑Molding | Extruder delivers parison continuously; reciprocating or rotary mold carriers capture parison. | Simple construction; suitable for small‑size high‑volume articles; multi‑die‑head & multi‑station configurations available for high efficiency. | Small bottles, toys, pharmaceutical packaging. |
| Intermittent Extrusion Blow‑Molding | Melt is accumulated inside accumulator head and rapidly discharged to form parison upon set volume. | Enables very large parisons weighing dozens of kilograms; programmable parison wall‑thickness control. | Large‑size chemical drums (20‑1000 L), automotive fuel tanks. |
Core Technical Specifications: Key Selection Indicators
After confirming machine type, select proper specifications with following critical parameters:
Screw Diameter (mm): Governs plasticizing capacity and throughput. Lab scale: 45 mm; industrial grades: 55 mm, 65 mm, 75 mm, 90 mm and larger.
Clamping Force (kN): Resistance capability of clamping mechanism against blowing pressure, ranging from tens kN up to over 1000 kN. Platen Size & Daylight Opening (mm): Define maximum mold dimension and maximum part height.
Accumulator Volume (L): Critical parameter for intermittent extrusion blow‑molding; determines maximum parison weight per shot, ranging from 1 kg to 240 kg.
Parison Wall‑Thickness Control Points: Core technology for wall‑thickness uniformity. Electro‑hydraulic servo controls die‑gap. More control points deliver finer adjustment, saving raw material and shortening cooling cycle. Options: 24‑point, 48‑point, up to 128‑point.
Product Volume Range (ml or L): Equipment capacity ranging from 1 ml micro‑bottles up to 10000 L large storage tanks.
Station & Cavity Count: Determines productivity. Injection‑blow machines commonly adopt 3‑station (preform, blow‑molding, ejection) or 4‑station layout. Extrusion blow‑molding supports dual‑die‑head, triple‑die‑head, quadruple‑die‑head or rotary‑type designs with up to 20 cavities; output can reach 15 000‑20 000 pieces per hour.
Selection Guidelines
Follow clear logic for blow‑molding‑equipment selection:
Determine process according to finished‑product characteristics ‑ Large containers (>5 L), complex‑shape parts or multi‑layer structures: choose extrusion blow‑molding machine. ‑ Small precision bottles (<500 ml) requiring strict neck‑dimensional tolerance: choose injection blow‑molding machine. ‑ High‑strength high‑transparency PET beverage containers: choose stretch blow‑molding machine (injection‑stretch‑blow for nearly all PET applications).
Define production scale based on output targets: Evaluate multi‑die‑head, multi‑station or rotary high‑efficiency configurations according to expected throughput.
Configure hardware according to quality requirements: Equip parison wall‑thickness control system for wall‑thickness uniformity requirements; select full‑electric or servo‑driven models for energy‑saving demands.
Participation Process
Manufacturers: Contact supplier service for supply registration.
Buyers: Click group‑purchase or contact procurement service to submit requirements. The platform filters suppliers from database or releases bidding based on aggregated demands. Buyers select competitive suppliers and sign sales contracts.
