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New oven from Smart Machine Technologies.

A nonwoven bonding oven was recently developed by Martinsville, VA firm Smart Machine Technologies.

The oven was developed for bonding a nonwoven material consisting of 20% polyester and 80% cotton. Depending on the loft requirements, the plenum will adjust to accommodate material with a 12 inch loft down to a 2 inch loft. It is also important for the product to cool quickly before it is rolled and shipped. When the product is unrolled by the customer, it must spring back to its original loft.

The 84 inch width, 15 foot length, 11 foot, three 1/4 inch high oven is constructed in two eight foot long sections. The oven is designed to be split for additional sections to be added at a lower cost for future added production needs.

The hot rolled steel structural tubing framework is enclosed with 4 inch thick, 18 gauge panels packed with type II TWI insulation. The lower pressure plenum is constructed of 14 gauge galvanized sheet, formed to provide belt support.

The correct air flow is critical so as not to disrupt material until it is bonded. Air flow is concentrated in a upward flow-through direction.

The upper suction plenum is fabricated with 16 gauge galvanized sheet. The upper plenum is adjustable, allowing for different types of materials to be run with different loft requirements. The face of the plenum has 14 gauge perforated nozzle sheets to provide a smooth face for the conveyor belt. The center of the plenum has a radius slip section to provide belt support to minimize sagging with the plenum face operating at top of product point.

An overhead conveyor is needed to keep material contained using an automatic belt guider located at the oven entrance.

This particular oven uses a Maxon 415 oven pak gas burner for natural gas. The temperature control is an electronic recording circular chart.

The penthouse section houses two backward inclined centrifugal fans, powered by A.C. motors with variable frequency speed adjustment.

At the exit end of the oven, a flow-through cooler section is required for this particular product. Also, at the exit end of the oven is a mounted press roll. The roll is carbon steel constructed and teflon coated to prevent product sticking. A press support roll is also included below the belt.

An electrical pre-wired control panel is provided to house necessary motor starters and burner controls.

"An oven developed specifically for the nonwovens industry is long overdue and Smart Machines takes pride in our ability to custom design any type oven to fit our customers' needs," states Irma Smart, president.
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Title Annotation:10th Annual Show in Print of the International Nonwovens Industry; nonwoven bonding oven
Publication:Nonwovens Industry
Date:May 1, 1992
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