• Non Standard Technology

    MS4-250-6000

  • Non Standard Technology

    Roto E-2-10000-220

  • Non Standard Technology

    Roto E-10000

  • Non Standard Technology

    Roto E-10000-220

  • Non Standard Technology

    Roto E-16000-5-400

  • Non Standard Technology

    RUBBER Roto R-12

  • Non Standard Technology

    RUBBER RS-1500-8000

  • Non Standard Technology

    RUBBER RS2-300-4000F

  • Non Standard Technology

    RUBBER RV-1600-6000

Machine Series and Information

About Presma

75 Years ago Presma manufactured their first Injection Moulding Machine, now they have thousands operating all around the World.

Presma were the first Italian company to produce a range of Injection Moulding Machines specifically for sandwich moulding for example, products with a compact Thermoplastic Skin but having a Foamed Thermoplastic core.

We can boast 20 different models of Presma rotary injection moulding machines within its “BIC” Range all for the production of Sandwich Moulding with Clamping Forces from 30 Tons – 600 Tons depending on the product.

The experience we have gained over the years in co-operation with our customers has enabled Presma to develop new ideas and Technologies in a field where the applications are still growing.

Co-injection

Co-injection sandwich or two-component moulding is the technique of injecting two materials, one solid and one with chemical foaming agent into a mould in a programmed manner through the same injection nozzle in order to produce a thick moulding with a solid outer skin of regular plastic and an inner core of structural foam. This technique substantially overcome warping, cracking, shrinkage and much of the built-in-stress found in conventionally moulded thick components. Co-injection or bi-component moulding represents the best system of producing thermoplastic items having a section of 5 mm. or more (0,2 inch or more), but requiring a smooth glossy surface.

Considering that first quality material is needed only on the outside and that second quality material can serve as a filler there can be important savings. Furthermore in making coloured items, colour concentrate is needed only for the outer component thus reducing also colouring costs. Co-injection is performed with the “Presma” patented injection head by engulfing first quality material with less costly material.

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Structural Foam

Structural Foam Moulding is used to produce bulky items overcoming warping, cracking, shrinkage and much of the built-in-stress found in conventionally moulded thick components. The surface aesthetic imperfections associated with structural foam moulding often require a finishing operation by painting, laquer spraying, dipping, veneering or covering with fabric materials unless these surface imperfections are exploited to obtain a wood like effect through colouring process.

The “piggy back” injection system extensively used by Presma is the perfect touch in structural foam. A preset quantity of material is extruded into two punching cylinders subsequently injected directly into the cavities of the mould through two or more nozzles

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ROTO HP-HSP-HSSP-HP120

ROTO HP-HSP-HSSP-HP120
Rotary machines with 8-10-18 stations for processing semi-expanded materials and/or for co-injection moulding, clamping power from 70 to 1200 KN.

Structural foam moulding of any thermoplastic material involves the use of foaming agents. This process reduces the density of bulky items and thus allows important savings of material in terms of weight and cost. However thick parts require a long cooling time ranging from 2 or 6 minutes so a multi-station rotary closing system is the appropriate solution.

ROTO BIC HSSP8

ROTO BIC HSSP8

One of the advantages of a rotary closing system is that it provides the best efficiency of the injection group which constantly and regularly fills the moulds one after the other. The residence time into the barrel is reduced to a minimum which assures a better quantity control and greater repeatability from shot to shot. On the carousel one can use dissimilar moulds of items varying in shape and weight since each station can be set up with differing parameters. One or more stations can be skipped automatically whenever a mould is not available or when a given production quantity has been reached.

Due to added environmental pressures from state regulations structural foam as well as co-injection when associated with a multi-station system is an interesting solution to the recycling problems whether industrial scraps or the more difficult mixed plastic or post consumer wastes are involved.

View and download Technical Data

SYSTEM E
SYSTEM E fig 2

SYSTEM E fig 2

SYSTEM E  The biggest rotative in the world

Rotary machines with 4-5-6-8 stations for processing semi-expanded materials and/or for co-injection moulding, clamping power from 600 to 6000 KN.

View and download Technical Data

ROTO R12 in Action

ROTO HP 2500-18 in Action
MS 4 250 6000 in Action
GTS 100 ST TC in Action
Gallery