McMINNVILLE, Oreg. (Dec. 28)—RB Rubber Products Inc. announced a rise in earnings in the second quarter and six-month period ended Oct. 31. RB said sales in the quarter increased 10.7 percent to $2,787,000, with net income of $149,000 or 5 cents per diluted share, versus sales of $2,518,000, and net income of $117,000 or 4 cents per share, for the corresponding quarter of 1999. For the six-month period, sales were $5,269,000, with net income of $287,000 or 10 cents per diluted share, contrasted with sales of $5,318,000, and net income of $224,000 or 8 cents per share for the comparable six months of 1999. RB President Ronald L. Bogh cited higher sales in the company´s Matting and Molded Products Divisions as contributing to increased earnings. Equipment upgrade costs at the firm´s Recycling Division in Portland, Oreg., affected profitability in the second quarter, but higher output efficiency at the site is expected at the completion of the project, Bogh said.