STONE

Top quality standards

STONE is a unique Company able to design, manufacture and start up top green-performing machines qualified by 25 years of experience of Asian team and by the whole ST Group technical department competence.

Extrusion section

Special screw/barrel design allowing:

intensive usage of recyclates granting a minimum energy consumption and best performances in output
exceptional process stability
high maximum througoutput capacities
excellent melt homogeneity
top energy efficiency in running HDPE, HMWPE or PA or barrier materials
homogeneous material and better colour mix (thanks to the extruder with long screw lengths in combination with improved mixing zones)

Low energy & green-performing best-matched extrusion solution

Technology gives the possibility to install either adiabatic extruders (by the heritage of the top ST technology ) or even - unique into BMM industry - DTSE Direct Twin Screw Extruders to reach best melt homogenization with recycled chips and perfect mix of masterbatch/additives.

The extruder drive is electro-mechanical and speed controlled using an energy efficient direct drive from the motor and transmission.

STONE COEXTRUSION HEADS FOR CONTINUOUS EXTRUSION

Spiral mandrel extrusion heads offer short, less shearing and uniform flow channel design with consistent melt and temperature homogeneity.

Advantages:

uniform wall thickness distribution over 360° around the article

improved quality and reduced weight, as no thin spots and weld seams have to be compensated for

reduced material and colour change times

no temperature-related influence on the die position (which reduces the setting times and the adjustment effort when starting production and reduces material usage)

article weight optimisation and prototype sampling by the process team before selecting the best machine size

Multi-cavity or tandem blown units guarantee best rates and a high overall system efficiency for packaging, bottles and containers of different sizes.
Smaller packaging units can also be manufacturer reliably and in very high volumes using.

Molded parts with best thickness distribution

Our strong and fruitful collaboration with the highly specialized companies in this segment, gives an undiscussed warranty of a reliable, high quality repeatable production with optimization of the wall thickness distribution and quick colour changing times, also in its co-extrusion version.

Mould easy change procedures

Quick Change System for Mould and Pins to support on fast production format changes (disassembly and assembly until/from integrated roller table in few minutes per clamping unit - without tools).
Mould transportation with forklift or crane, without a special mould cart Requires only a small amount of space Blow pins can be changed just as easily and without additional centering effort.

Innovative clamping press

The unique clamping unit concept enables completely symmetrical clamp force distribution along the entire mould area, while maintaining high parallelism of the mould platens.
The full clamp force is available independent of the mould thickness without adjustment.
A precise clamp force distribution during the clamping process results in ideal article weld formation.
STONE high degree of production experience makes our machines particularly flexible.
Patented clamping unit with symmetrical clamping force distribution with almost 100% closing plate parallelism O ST

Top electrical architecture & complete digitalization of machine parameters

New machine HMI with total process control allows an easy operation of the machine by intuitive user interface including - on demand - an Industry 4.0 ready up-to-date information overview in a customizable dashboard including full visualization of throughout values and energy costs.

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Continuous Extrusion Consumer Packaging Machines

MEDIUM AND SMALL MACHINES ( even multi-cavities)

Available as all-electric, hydraulic and hybrid versions. Both single and double stations, fast machines for containers up to 25/30 litres for multi-purpose applications as well as for sterile and multilayer packaging.

Continuous extrusion process.

Clamping force gap (kN): 60 - 300
Mould width gap (mm): 270 - 1260
Carriage stroke gap (mm): 280 – 1.280
Production Example per Mould (litres): 2 x 1; 3 x 1; 4 x 1; 1 x 10;2 x 5; 2 x 10; 3 x 6; 3 x 10; 4 x 5.

Industrial Packaging Machines

MEDIUM AND BIG MACHINES

Innovative concept to produce Stackable Jerrycans, L-RING drums and IBC containers with fast cycle and best physical & mechanical performance with minimum weight.

From 20 lts and above liquids containers capacity (canister/jerrycans, drums & IBC’s, future mobility & CPV and technical parts).

Continuous & Accumulator Head extrusion process.

Clamping force gap (kN): 400 - 1500
Mould width gap (mm): 780 - 2200
Carriage stroke gap (mm): 400 – 1.150
Production Example per Mould (litres): 1 x 25; 1 x 30; 1 x 60; 1 x 250; 1 x 1.000; 1 x more than 1.000

Auxiliary downstreams

The configuration of the machines can include the standard deflashing system, with the masks attached on the moulds and post-cooling stations, or customized layout and solutions, for example with a cooling tunnel and a deflashing station external to the machine, to remove the flashes in the horizontal position and collect them by gravity.Stone Process Quality Control System (SPQCS) is placed in-line with the machine, as a stand-alone control island, offering different layout options, based on Customer’s space limitation.

In line quality check

The ancillary equipment can be completed by several options as:

Leak detection by pressure differential
Weighting station for net weight measurement
Vision control with multi camera system, for aesthetical defects on the walls of the containers, for example black dots
Scanner to check neck ovality and diameter, handle shape and dimension, presence of eventual residual material inside the neck or flash in sunken handles, shape of the product, etc

The station offers a diversified reject direction based on the defect, as an example to avoid that some products with black dots end up into the grinder and therefore into the extruder again. Both vision system and scanner can be customized based on different needs, during the definition stage of the project, to fully comply with the requirements and to offer a tailored-made solution. Those extra QC ancillaries are fully integrated to the machine HMI, through dedicated pages, allowing a constant control of the production process.

THE STONE MACHINE TECHNICAL FEATURES & QUALITY STANDARDS

A complete range of blow-moulding machines for several applications and industries.