TAIPEI (Reuters) - Taiwan's Acer Inc. said on Tuesday its sales will grow by more than 50 percent this year, raising its previous forecast as demand for laptops grows despite consumers feeling the pinch from an economic slowdown and rising fuel and food prices.

The world No.3 PC vendor said that smaller, cheaper laptops are seeing significant growth from emerging markets, such as China and India, and as many consumers buy additional computers that can connect to the Internet for home and travel.

"The notebook market is growing for at least the next two to three years, and with the entry of new mobile internet devices, the market can easily double in size, changing the profile of the industry dramatically," Acer President Gianfranco Lanci told Reuters in an interview.

"I think all the major PC brands are getting ready to face the change and to manage the change," said Lanci.

Competing against Lenovo, Hewlett-Packard, and Dell Inc., Acer has expanded into fast-growing consumer markets, such as China, India, Russia, Latin America, and the Middle East, and Lanci said the firm could take up 16-18 percent of the global PC market by year end.

To diversify its product line, Acer launched a lightweight 9-inch Aspire One laptop on Tuesday during this year's Computex, the world's second largest computer show, following popular reception for such models from smaller local rival Asustek Computer.

Dell and HP are also expected to launch similar PCs in the second half of this year, and competition could soon heat up as more PC companies enter the race, analysts said.

Acer's Lanci said the company expects to sell 6-7 million units of Aspire One this year, priced at $399-$499, and 15-20 million units in 2009, as the global low-cost PC market looks set to hit 40-45 million units next year.

But many analysts expressed concern that the new less expensive and portable PCs could cannibalize the regular laptop market.

"In my view they are two separate markets and it (smaller low-cost PCs) will not eat into the regular notebook market -- it will only expand the business," said Lanci.

Lanci also added that the company was on track to ship 25-30 million PCs this year, up from 20-21 million last year, excluding the new low-cost models, as consumer demand remained robust in markets like Europe.

Taiwan's Acer, which bought U.S. computer brand Gateway Inc and Paris-based Packard Bell, dethroned Lenovo last year as the third largest PC brand in the world, grabbing market share through the acquisitions.

Forecasts from 18 analysts on Reuters Estimates showed that Acer would gain a net profit of T$12.67 billion ($419 million) this year, slightly lower than T$12.96 billion a year ago.

"Our forecasted full year earnings are above consensus since we are more optimistic about Acer's prospects for profitability and growth, and we prefer companies with greater scope as well as those leveraging off emerging market growth," said Nomura International analyst Ellen Tseng, who rates Acer at "buy".

On Tuesday, Acer shares fell 1.9 percent to T$63.10, while the main TAIEX index ended down 1.7 percent. So far this year, its shares have slipped about 2 percent, underperforming the big board's 1 percent gain.

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