Sekisui process

There has been interest, particularly in Japan, in the production of cross-linked low-density polyethylene foam. Some processes, such as the Furukawa process and the Hitachi process, use chemical cross-linking techniques whilst others, such as the Sekisui process, involve radiation cross-linking. 

A cross-linked polyolefin foam sheet is produced by two methods using chemical cross-linking and by two methods of radiation cross-linking. The two well-established manufacturing processes for polyolefin foams using radiation cross-linking are the Sekisui process and Toray process. The differences between these two manufacturing methods are mainly in the expansion step, which is almost always done separately. However, the... 

Foamed composites appearing on the market include Thermax (Celotex Corp) (35), Elsen Neo-Lumber FFU (Sekisui Chemical Co., Ltd., Japan) (1,3,8,22), Airlite FRU (Nisshinbo Industries, Inc., Japan) (2), and Polywood (Polymetrics, Inc., Michigan, USA) (5). NPC Inc., New Hampshire, USA, has developed foamed composites, a continuous production process, and equipment for the composites (19, 21). Their product is named Synwood. 

A typical example of a monoaxially reinforced foamed composite is that developed by Sekisui Chem. Co., Ltd., Japan. Eslon Nro-Liunber FFU has this structure (22). Its production process has not been disclosed. An example of a two-dimensionally reinforced foamed composite was developed by Nisshinbo Ind. Inc., Japan. The production process employed was the compression-molding process (2). The structure of the... 

Sekisui-Plastics. J6 0259-1% 07-10-1983 JP-187111 21-12-1985. A process for preparing Rauvolfia alkaloids, e.g., reserpine, by tissue culture of Rauvolfia plants, using a culture medium containing 2,4-D and kinetin for callus proliferation and a culture medium containing naphthaleneacetic acid and cytokinins for callus growth deterioration. Chem. Abstr. 104, 147155d. 

The majority of cross-linked polyolefin foam sheet products are made by one of the four Japanese processes Sekisui, Toray, Furukawa, and Hitachi, the first two of which use the radiation method and the latter two a chemical method for cross-linking. 

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