Meiki – Injection-Press Machine

Posted by: Eastern Plastics | on June 7, 2013

Injection-Press Machine

Meiki’s Injection-Press Machine allows for easier moulding of larger and thicker products. It simultaneous compresses the material during injection ensuring a more uniform moulding, compared to a conventional clamping method which is unable to mould such large products.

Comparison to Conventional Machines

The Injection-Press machine, unlike conventional machines, delivers this performance by leaving the mould open during the injection phase. It utilises a 4-Axis clamp parallelism and injection volume control to maintain an equal pressure on the material throughout the mould. As a result, the resin flowing pressure and residual stress are drastically reduced, allowing for less warping of flat products. This high performance can be attained even when using edge gate moulds. It even has improved performance with composite/glued mouldings because of its low uniform pressure.

Examples

Under Engine Skirt

Uniform thickness and less distortion/warping
Projection area= 5700cm2
Material: PP
Thickness 1.3~2.0mm
Temperature: 260℃
Centre gate Mould Temperature: 60℃

Injection press moulded Press pressure = 650-ton

Standard injection moulding process Clamping force = 850 ton Injection pressure = 1700kg/cm2

M200C-DM Laptop Chassis

- Glued moulding- Copper foil(35um)
- Material: ABS/PC/PBT+CF15%
- Thickness＝0.9mm

Door Trim

Lower material flowing pressures allows soft inserts to be over moulded.

Glued Fabric insert

Moulding sequence

Injection-Press moulding sequence example

Mould closes to controlled open position
Injection starts
Mould compression
Mould open and ejection

Meiki Pre-Press System (MPPS)

The Meiki Pre-Press System preloads the material in the screw and barrel using a shut-off valve at the nozzle tip. The screw moves forward closing the check valve on the head, trapping the material inside the barrel at a constant pre-injection pressure achieving an even load density. The screw position after pressurisation is taken as the injection shot volume starting point by the MPPS control system. This enables a constant shot volume to be injected into the mould. Removing any unwanted variation in final product quality.