PDF Publication Title:
Text from PDF Page: 012
Plate 1. Preparation of end matched boards Plate 2. End coated and labelled boards One-half of the end–matched boards remained on–site for industry standard conventional drying. The conventional drying treatment differed between trials depending on each site’s general practice (i.e. kiln drying from green or a combination of air and final kiln drying). We wrapped the other half of the boards in impermeable plastic to prevent drying during transportation and dispatched to the DEEDI Salisbury Research Centre (SRC) for vacuum drying. The conventionally dried material was transported to SRC for dried quality assessment upon the completion of drying. For each trial 100 end–matched sample boards were randomly1 chosen for detailed wood property and quality assessment. We chose this number of boards based on our experience to account for the natural variation of wood properties. 3.1.2 Drying properties and quality Table 2 outlines the wood properties and dried quality assessments performed on the 100 sample boards for both conventional and vacuum drying trials. Figure 1 illustrates the sampling breakdown, showing length of samples and properties measured, for each trial. We conducted all tests in accordance with: • Australian and New Zealand standards AS/NZS 1080.1:1997 Timber–Methods of test– Method 1: Moisture content (Standards Australia, 1997), • AS/NZS 1080.3:2000 Timber–Methods of Test–Method 3: Density (Standards Australia, 2000), • AS 2796:1999 Timber–Hardwood–Sawn and milled products (Standards Australia, 1999) and AS/NZS 4787:2001 Timber–Assessment of drying quality (Standards Australia, 2001). We did not measure wood properties on the conventionally dried boards in the green condition as we assumed that over a sample size of 100 boards the average end–matched sample properties would be similar to those measured for the vacuum dried boards in the green condition. All properties measured for the vacuum dried sample boards were on the undressed timber, except for surface checking which were undertaken after dressing. Boards were evenly dressed on both wide faces to the common strip flooring thickness of 19 mm. For the purpose of this study, dried quality in accordance with AS/NZS 4787:2001 (Standards Australia, 2001) was deemed acceptable if 90% of samples fell into quality class B or better, unless otherwise stated. 1 Numbers randomly generated using Research Randomizer internet program, see http://www.randomizer.org/form.htm. 5PDF Image | Evaluation of super-heated steam vacuum drying
PDF Search Title:
Evaluation of super-heated steam vacuum dryingOriginal File Name Searched:
PN08_2047_Vacuum_Drying_Reviewed_Report.pdfDIY PDF Search: Google It | Yahoo | Bing
5,000 BF Shipping Container Lumber Dry Kiln For Quality Lumber The 5,000 BF container kiln consists of one 40 foot high-cube aluminum shipping container... More Info
Shipping Container Lumber Dry Kilns by Global Energy Global Energy designed and developed the container kiln back in 1991. The purpose is to give access to portable sawmill owners, furniture makers, and small business the value added profit of dry kiln lumber and quality hardwoods... More Info
Vacuum Kiln Conversion Kit for Lumber and Wood Dry Kilns Convert your existing conventional dry kiln into a fast drying vacuum kiln. Similar to vacuum bagging in the boat building and aircraft industry, we have come up with a proprietary process which allows you to build a very simple vacuum kiln at a fraction of the price, and without the intensive conventional metal chamber structure... More Info
Vacuum Pump Cart System for Bagging Clamping Wood Drying and more Vacuum Cart with 2HP Pump and Dual Pistons with multiple multiplex vacuum ports and liquid reservoir... More Info
Vacuum Bagging Basics Vacuum bagging is a method of clamping, which has traditionally been used in the composites industry, but can also be used for vacuum drying materials, including wood products... More Info
CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com (Standard Web Page)