Papers

  • Extra-Large Plant for Just-In-Time

Cannon Maersk

The request for large foam -insulated sandwich panels is on the rise in Europe, and Polyurethane’s characteristics perfectly match the processing difficulties linked with these huge elements. A Cannon - Manni foaming plant has just been delivered in Europe to produce very large building panels in a “just in time” sequence, according to the method used to assemble the final building.

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    Garden chairs: an example of synergy between injection moulding and integral skin Polyurethanes

    During 1997 the Cannon Group incorporated the activities of Sandretto, the largest - and one of the earliest - Italian producers of injection moulding presses. Immediately after the acquisition a series of R&D projects were initiated, to look into all the possible synergies between current and newly acquired technologies. The first project that brought practical results was the study of an injection moulded plastic part over-moulded with flexible Polyurethane. The product, a plastic garden chair with a very comfortable foamed seat, was produced at K’98 in the Sandretto stand. This paper presents the details of the project, and the potential development deriving from the combined use of plastic’s injection moulding and Polyurethane foaming.

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    Innovative Solution for Manufacturing Insulated Curved Roofs for Industrial Buildings

    The replacement of asbestos-based flat and curved roof panels provided the opportunity to replace poorly-insulated roofs with energy-efficient insulating elements, obtained foam-backing various facings (fibrous-concrete, painted steel etc) with a low-density Polyurethane rigid foam. This paper illustrates the innovative equipment supplied recently to manufacture curved insulated roof panels using a very compact, highly automated plant based on rotating mould carrier.

     

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    An Innovative Solution to Fully Automate the Manufacture of Automotive Sound Deadening Parts - “Foam & Film” Technology

    Until now, one of the major limitations in the polyurethane molding process has been the necessity to interrupt the working sequence between each molding, to remove foam scraps and apply release agent prior to foaming. The introduction of the new Cannon-patented “Foam & Film” technology makes manual intervention unnecessary, removes the one factor that has always been a major weakness when working with polyurethanes in comparison to other injected or extruded plastics. The main idea behind this new approach consists of thermoforming a thermoplastic or polyurethane film as part of the molding sequence. By using a vacuum effect, this film adheres perfectly and smoothly to the mold cavity, without any creases or wrinkle formation. The mold is equipped with a dedicated frame device, specifically designed to hold the film. A heating system ensures that the film reaches the desired temperature prior to the thermoforming phase and subsequent injection of polyurethane into the mold. Several industrial applications have been found and a number of fully automated plants currently incorporate this technology. The manufacture of sound deadening parts for the automotive industry represents one of the most exciting applications for this innovative technology.

     

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    Refrigerator cabinet sealing – A robotized solution

    In the production line of domestic refrigerators the accurate sealing of the cabinet before the injection of the PU foam is a necessary operation to avoid material leakage during the cabinet's filling. This cabinet' sealing operation is still completely manual and presents significant disadvantages, such as high labour requirements and non-ergonomic operations. Cannon describes in this paper the recent experiences made in their Italian R&D labs for the sealing of cabinets with a poured-in-place PU system. The use of a flexible system minimises the volume occupied by this non-insulating PU: during its expansion the rigid insulation foam will compress this open-cell sealing material. The use of a robot replaces all manual operations with an automatic process.

     

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    Latest developments in machinery for gasketing and casting for roller-blades wheels.

    Cannon started their Polyurethane dosing unit production with low pressure machines performing all traditional technologies where Polyurethanes were involved. Switching in the early ‘70s to high pressure technology, Cannon have become a leader of this technology, but also went on developing the low pressure series of machines, especially in the direction of low output applications. In Cannon production range today is possible to find low pressure low output machines for different specific applications. The basic model is the B2 machine, a low pressure metering unit with electronic process control. These peculiar technologies required specific performances not only related to very low outputs, but also involving new materials which are definitely different from traditional Polyurethanes. The main special applications where these unit are used for are: * air filters for automotive industry; * industrial gaskets; * slat filling; * elastomer parts. This paper focuses on the development of dedicated equipment for gaskets and cast-elastomer wheels.