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Laboratory Press

Laboratory press, with 250x250 mm platens and 25 T closure force, for the compression moulding of plates and specimens.

Gibitre Laboratory Press
is currently installed in
37 countries
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The laboratory press is an important tool for the preparing of samples with reproducible characteristics.
Uniform temperature distribution over the platen Surface and mechanical solidity to ensure constant thickness of the sample and consistent closure force are basic elements to ensure this result.

Key Features 
• Mechanical structure with 4 columns (with 60 mm diameter) and sliding platen driven by self-lubricating bushings
• Hydraulic system with 25 tons closure force
• 250x250 mm chrome plated steel platens with 40 mm thickness
• Specifically designed flat heating elements to ensure uniform temperature distribution over the platen surface
• Closed moulding area for easy fume aspiration
• Protection doors with safety lock
• CE Labelling
Automatic Press Control 
The PLC controller for the press is provided with a user-friendly Touch Screen Display and permits the free definition of the moulding cycle by setting:
• The displacements of the moving platen of the press,
• The thermal cycle (different temperatures of the platens and thermal gradients can be set within a moulding cycle)
• The pressure cycle (with the force control option installed).
Three Moulding cycles can be stored. Each cycle includes 24 moulding steps (including displacements, temperatures setups and pressure setups)

Cooling system 
The cooling of the press platens during the molding cycle is necessary for the molding of thermoplastic materials because the material must be cooled to the solidification temperature before opening the mold.

The Gibitre press can be equipped with cooling device that allows the cooling of the platens at controlled speed.

Closure Force Control 
The Digital pressure regulation system is designed for applications that require an accurate control of closure force.
A specific 2-stages hydraulic circuit, which includes proportional regulation valves and continuous fine regulation pumping system, has been designed to ensure accurate pressure control.
The results is a smooth and consistent force control which permit to set the closure force between 10 kN and 250 kN with 10 N set force regulation steps with regulation oscillations lower than 1000 N.
The control of the closing force is performed using the Automatic Press Control that must be installed in combination with the Closure Force Control option.
The Automatic Press Control device permits to set multiple pressure regulation steps within the moulding cycle.

Moulds for producing plates and different types of samples according to international standards are available. Fixing rails with sliding system permit easily handling of the moulds. Mould produced upon customer design and company logo engraving are available on request.

Read more about Gibitre Moulds
Gibitre Press Logger 
The Automatic Press Control device is fitted with a USB port which permits the connection to a Pc. The Gibitre Press Logger program permits the continuous recording of the press conditions (temperature, pressure, moving platen position, cycle step). Both graphical and numerical recording is provided with automatic generation of daily storage files. The program is compatible with Windows 7 and 8 and 10 (64 bits).

Standard Calibration service for Laboratory Press 
Maintenance and Calibration service for your Laboratory Press.
The service includes:
• Ordinaly maintenance of the instrument
• Calibration of the temperature of the platens. The temperature is measured, with the plates closed, in 9 different points of the platens and at 3 different temperatures (140°C, 170°C, 200°C).
• Calibration of the closure Force (50, 100, 150, 250 kN)
• Issue and e-mail shipment of the Calibration Certificate with traceability to primary standards.

Sample Calibration Report

Safety devices 
• Safety protection doors fitted with safety switch.
• Safety Push-button
• CE labelling

Development and production 
The instrument is totally developed and produced in the plant of Gibitre Instruments in Italy.
All the mechanical parts are produced in the company workshop using modern CNC machines.
Components and sensors from well-known brands are selected in order to ensure the maximum reliability in the measures
Internal trained personnel takes care of all the production stages: assembly, start-up, calibration, packing, shipment and installation.

Technical specifications
Reference Standards
Standards the instrument complies with:  ISO 6916-2; ISO 293; ISO 2393; ASTM D3182; ISO 6916-1; UNI 5572;  
Instrument Characteristics
Max useable platen surface  250 mm x 250 mm  Max closure force  25 Tons  Max platen stroke  200 mm  Temperatures  Up to 250°C (300°C optional).
0.1°C Resolution.
Temperature uniformity in the area 200x200mm:
Maximimum deviation from the centre of the platen <0,5°C.
Mean difference of platen temperature from set point <0,5°C. 
Cooling System (Option)  Cooling of the platens with controlled cooling gradient. The cooling is controlled using the Automatic Press control PLC device  Closure force Control(option)  Continuous control of the closing force with regulation between 10 and 250 kN with 10N regulation steps. Max. regulation error: 1 kN. 
Press control device
Touch Screen PLC controller  PLC with touch-screen display. Permits to: • set displacements of the moving plate • set the temperatures • activate the cooling and cooling rate (with cooling option) • set closure force (with force regulation option) 
Safety Devices
Safety Devices  • Safety Pushbutton.
• Doors with safety switch 
Labelling  CE Labelling 
Calibration Report  Calibration report with traceability to primary standards in conformity with the Calibration requirements specified in ISO 2393 standard  Calibrated parameters  The certificate includes the calibration of:
- temperature of the platens. The measure is performed in 9 different points of the platens and at 3 different temperatures (140°C, 170°C, 200°C).
- Closure force (with Pressure control option) 
Construction Characteristics
Platen temperature control  - Electrical heating.
- Independent temperature control of the plates by means of PID controllers 
Power supply  380 VAC ±10%,50 Hz ±3, 10 A,three-phase -Other on request  Electrical power  6 KW  Instrument dimensions (with mounted side drawer)  (Width x Depth x Height) 1200 x 950 x 1800 mm  Instrument dimensions (without side drawer)  (Width x Depth x Height) 650 x 950 x 1800 mm  Weight  520 Kg 
Cooling System
Cooling System  The cooling is perform with the connection too a water source (or a chiller). The control of the cooling and of the cooling rate are controlled by the PLC controller.  Connection to cooling liquid  The water supplied to the Press must be demineralized.
The fittings for the inlet water is 1/4" 
Insulated tank for cooling water (optional)  The hot water, which exits from the cooling circuit, must be cooled before being discharged. The insulated tank permits to store and cool the water before the discharge  Water consumption  The cooling of the platens of the press, starting from 250°C down to 70°C requires approxiametely 30 liters of water. The quantity changes depending from the temperature of the water used. 
Gibitre Press Logger  Software compatible with Windows 7, 8 and 10 for continuous recording of the press conditions (temperature, pressure, moving platen position, cycle step).
The software is connected to the press with USB cable 
Product leaflet

General catalogue

Calibration certificate
CE certificate


How to handle the water outgoing from the cooling system?
The water leaving the press must be cooled before being discharged. An optional reservoir for outgoing water treatment is available.
How much water is needed for a complete cooling cycle?
The cooling of the platens of the press, starting from 250°C down to 70°C requires approxiametely 30 liters of water. The quantity changes depending from the temperature of the water used.
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