Capabilities - Equipment

Capabilities

Equipment

Graham has extensive experience with a wide range of technologies. This ensures that all our customers' needs are met. A high percentage of the bottles Graham manufactures are made using our own high-capability proprietary technology. Our products meet both customer expectations and supply chain requirements.

Extrusion Blow Molding (EBM)

In the extrusion blow molding process a tube of polyolefin plastic is extruded through a pin and die. This plastic tube is then cut and pushed into a chilled blow mold with low pressure air to form the bottle shape.

In order to capably complete this bottle blowing process, Graham uses extrusion blow molding machines consisting of both wheel and shuttle equipment.

  • EBM Wheels: In general, wheels are used for higher volume manufacturing where fast cycle times and higher cavitations are beneficial. The higher output of wheel equipment is ideal for on-site application where the speed of the EBM wheel is a good match for that of the filling line. In addition, wheels are used for multilayer application where the equipment's layer structure capability is better than that of shuttles.
  • Shuttle machines tend to be used for shorter run lengths where higher flexibility may be needed or for bottles with more specific neck designs.

Unlike most plastic bottle manufacturers, Graham has the advantage of having both wheels and shuttles in its EBM machine portfolio. This ensures that the best technology is always available to meet customer requirements.

Injection Stretch Blow Molding

During the injection stretch blow molding process, the material, normally PET, is injected into a mold to form a preform. This preform is then either stretch blown immediately into a plastic bottle using high pressure air (one-stage), or stored and blown into the bottle on a second machine at a later point in time (two-stage).

Graham uses both one and two-stage injection machines dependent upon the product requirement and the number of bottles needed.

  • One-stage PET machines: In general, Graham’s one-stage technology offers higher flexibility and is good for lower volumes and complex products.
  • Two-stage PET machines: Graham’s two-stage technology is used for higher volumes where the economies of scale benefit the bottle economics. Two-stage equipment is also used for on-site manufacture where higher output speeds are needed to match the filling line.