RISING sales and market share are pushing San Miguel Brewery into investing in sophisticated technology to enhance brewing efficiency. The company, which raised eyebrows recently when it received a government land grant for its new brewery site in Yuen Long, is looking to import state-of-the-art technology for use in its new plant to increase output and efficiency. The company said yesterday its dominant market share had risen two per cent over the past year and that sales of its principal product, San Miguel pilsner, rose 12.2 per cent in the first four months of this year compared with the same period last year. Managing director Stuart McGregor said increasing sales had contributed to the company's decision to invest in technology to boost output. He said the new plant's four-hectare site, in which the company plans to invest about $1 billion, would start operations in mid-1996. Mr McGregor also said the company had no plans to follow rivals by moving into Guangdong. ''Subject to final approval by our shareholders, the new brewery will be a truly state-of-the-art operation as befits Hong Kong's reputation as a modern and hi-tech centre.'' Mr McGregor said the new technology would be more cost-effective and would allow for maximum flexibility in terms of product packaging and site layout. ''We are producing about 1,500 cans and 800 bottles per minute. With this new technology we could increase that to maybe 1,200 bottles per minute and a lot more cans,'' he said. Yesterday marked the official launch of the company's Blue Ice beer. The beer uses a unique freezing method, which is already popular in North America and Europe, to brew a smoother flavoured beer ideal for the territory's hot weather. Mr McGregor said: ''The Hong Kong beer market is a mature one and we are convinced we must strive to satisfy all tastes. Blue Ice is now available and the take-off has been far beyond our expectations.''