FAQ - Buck blow molding machine

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Equipment Operation & Maintenance

Q How much floor space does the machine need? How large workshop is required?

A Medium‑small fully‑automatic machine occupies about 6‑10 ㎡. Large accumulator‑head machines need larger space. Extra space shall be reserved for auxiliary machines and finished‑goods turnover. You may send your site dimension for our layout suggestion.
Q What is the warranty period?

A
12‑month whole‑machine warranty. Wearing parts (blades, sealing rings, heater bands) are excluded from warranty. Original spare parts can be supplied continuously after warranty expiration.
Q What services are included for exported machines?

A
Pre‑shipment inspection & testing; English operation manual; remote video guidance for installation & commissioning; oversea on‑site technical service available (travel expenses borne by buyer); lifetime technical after‑sales support.
Q Do you supply molds? What is mold service life?

A
Custom‑developed molds are available. Aluminum alloy molds: hundreds of thousands shots; steel molds: more than one million shots, subject to products and raw materials.
Q Can the machine match our local voltage?

A
Yes. Voltage and frequency can be customized according to clients’ local power grid for motors and electric control system.
Q What is your machine lead time?

A
30‑45 working days for standard models; 45‑60 working days for customized and accumulator‑head models, excluding sea freight time.
Q Frequent alarm of chiller, root causes?

A
Filter blocked by impurities in cooling water; insufficient water level; dust‑covered condenser; excessive ambient temperature; blocked circulating pipeline.
Q How often to sharpen crusher blades?

A
Inspect blades every 2‑3 months under normal production. Sharpen blunt blades timely. Over‑large crushed particles will harm finished product quality.
Q Daily maintenance for screw and barrel?

A
Clean barrel thoroughly when switching raw materials; lower temperature for long‑time shutdown; prevent metal hard objects from entering feeding port to avoid screw scratch; inspect wear clearance regularly.
Q What to do if hydraulic oil temperature is too high?

A
Check cooling performance of chiller; replace aged hydraulic oil; reduce excessive relief‑valve pressure; avoid long‑time non‑stop running. Replace hydraulic oil periodically.
Q What pre‑start‑up inspections shall be done for new machines?

A
Check hydraulic oil level, air compressor pressure and chiller water circulation; confirm mold fastening; keep heating zones at target temperature for 30‑minute heat preservation; perform dry clamping test before feeding raw materials.
Q Difficult demolding, plastic sticking to mold cavity?

A
Excessively high mold temperature; insufficient draft angle; rough mold cavity surface; over‑high raw material temperature; appropriate release agent can be added.
Q Products cannot be fully blown out or have local depressions?

A
Insufficient blowing air pressure; blocked blowing nozzle; over‑fast mold cooling; too‑short parison; blocked mold exhaust holes.
Q Obvious parting line and large flash on products, how to fix?

A
Insufficient clamping force; worn mold parting surface; excessive clearance of clamping mechanism; excessive parison material volume.
Q How to solve air‑bubble defects on blow‑molded products?

A
Dry damp raw materials; reduce barrel temperature to avoid material decomposition; check screw compression ratio; remove moisture and impurities inside raw materials.
Q What causes uneven wall thickness of finished parts?

A
① Improper die head gap adjustment; ② Unstable parison extrusion speed; ③ Raw material temperature fluctuation; ④ Inconsistent mold cooling performance; ⑤ Unstable extrusion pressure of accumulator head.
Q Which machine is suitable for 1‑5L plastic bottles?

A
Medium‑small fully‑automatic blow molding machines are recommended for 1‑5L daily‑chemical bottles and oil bottles. Multi‑cavity molds can be matched to improve production capacity.
Q What auxiliary machines are required for a blow molding unit?

A
Chiller, screw air compressor, auto loader, material mixer and plastic crusher. Optional equipment includes mold temperature controller and material dryer based on raw materials and output requirements.
Q What plastic materials can the blow molding machine process?

A
Main materials: HDPE, PP. Some models support LDPE and EVA. For PET bottles, injection‑blow integrated machines are recommended; ordinary hollow blow molding machines are not ideal for PET processing.
Q What products are suitable for accumulator‑head blow molding machines?

A
It is mainly used for large‑capacity hollow articles, such as 20L‑200L chemical drums, water tanks, amusement parts and automotive plastic components. It fits heavy‑weight thick‑wall products which ordinary machines cannot produce.

Equipment Operation & Maintenance

Equipment Operation & Maintenance

Q How much floor space does the machine need? How large workshop is required?

Q What is the warranty period?

Q What services are included for exported machines?

Q Do you supply molds? What is mold service life?

Q Can the machine match our local voltage?

Q What is your machine lead time?

Q Frequent alarm of chiller, root causes?

Q How often to sharpen crusher blades?

Q Daily maintenance for screw and barrel?

Q What to do if hydraulic oil temperature is too high?

Q What pre‑start‑up inspections shall be done for new machines?

Q Difficult demolding, plastic sticking to mold cavity?

Q Products cannot be fully blown out or have local depressions?

Q Obvious parting line and large flash on products, how to fix?

Q How to solve air‑bubble defects on blow‑molded products?

Q What causes uneven wall thickness of finished parts?

Q Which machine is suitable for 1‑5L plastic bottles?

Q What auxiliary machines are required for a blow molding unit?

Q What plastic materials can the blow molding machine process?

Q What products are suitable for accumulator‑head blow molding machines?

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