Moisture streaks

To avoid streaks, the nozzles have a defined spray angle and a defined distance to the sheet. Spray angle and distance are chosen to ensure an overlapping spray pattern. Thus, each nozzle sprays 50% of the water into neighboring control zones. This avoids moisture streaks in the rewetting process. 

The polymers absorb some moisture and at the high moulding temperatures employed this can be very troublesome, leading to streaks and splash marks. 

Tears streamed down my cheeks from the intensity of the beauty. I saw visions of tear-streaked masks of goddesses from Neolithic Old Europe. I felt the sacred moisture of the Goddess, her beauty and love. I anointed my crystals, my partner, and myself with my tears. A huge rainstorm came the next day. I felt very grateful to receive this experience from the mushrooms. 

Plant wilts while soil is moist. Cause Fusarium wilt. Fusarium spp. fungi sometimes infect astilbes, causing wilting unrelated to adequate soil moisture. Young plants wilt quickly, while older ones turn pale green and lower leaves wilt. Stems show brown streaks that darken gradually grayish pink mold may appear. Remove and destroy infected plants... 

Special considerations moisture causes bubbles, streaking, and splay marks compounding with glass fiber has very little effect on PES heat deflection temperature and marginally increases LOI but tensile strength is improved in a broad spectrum of temperatures... 

Special considerations material should have a moisture content below 0.05% to prevent bubbling, surface streaks, etc. 

Many defects in molded sheet can be related to fillers. Blistering may be caused by moisture but also by insufficient wetting of fibers and entrapped air pockets. Inconsistent cure and thickening is caused by the presence of moisture. Improper fiber orientation may initiate Ifacture cracks. Flow marks, streaks, warpage, and protruding fibers are also caused by improper fiber orientation. 

Moisture in the materials during forming can cause problems such as bubbles, voids or streaks. In addition, in condensation polymers such as PA s or PEST s, water can react with the polymers causing molecular weight loss. Moisture level is then particularly critical and, in general, blends... 

Drying requirements of ABS-based blends vary widely, depending on the other components and their concentration. In general, the presence of moisture will produce surface defects such as silver streaks or blisters. With non hygroscopic... 

For papermaking, machines are in use with 50-500 kW of RF at 27.12 or 13.56 MHz. The RF is able to overcome the most common problems encountered at the dry end of the process low efficiency due to moisture distribution through the paper thickness, uneven moisture distribution across the width of the web, temporary unevenness or streaks of moisture due to some failure of the equipment, and cyclic variations in the machine direction. 

The traditional approach taken for wet streaks is to overdry the sheet. However, a 1982 study [26] showed that overdrying from 6% to 4% reel moisture for a typical 800 t/day capacity linerboard machine results in 189,000 additional steam cost and 11,200 t production loss per year because of the reduction in machine speed. Uniform CM moisture profile is obtained by improving dryer pocket ventilation systems and using supplemental drying, such as air impingement or radiant drying. 

Ammonia Vapor and liquid Wood pumped down, exposed to anhydrous ammonia vapor or liquid at ISOpsi treatment time depends upon thickness and moisture content, ranges from minutes to hours loblolly pine requires longer exposure than hardwoods bends in -in, stock up to 90 treated wood darker in color and sometimes streaked Experimental products made snowshoes, picture frames, chair backs, lamps, room dividers... 

Blown film grades of PU are usually easy to process because they are synthesized to have good melt strength. They are generally processed at temperatures between 350 and 400 °F (180 and 205 °C). However, they are highly moisture absorbent and, if not dried adequately, exhibit gels, streaks, and low melt strength. 

Marks or lines found on the surface of the part after molding that may be caused by overheating the material, moisture in the material, or flow paths in the part. Usually white, silver, or gold in color. Also called silver streaking. 

If stored incorrectly the material will pick up sufficient moisture to give streaks, or blisters, on the moldings. It is recommended to reduce the moisture content within the pellets to below 0.1% before use best to dry all ASA for 2 to 4 hours at 80 to 85° C (176 to 185° F) before molding. When using hopper dryers the temperature can be increased to 90° C (194° F) so as to ensure that the material is sufficiently dry prior to being molded. If a circulating air oven is used then dry for 2 hours at 80 to 85° C (176 to 185° F). 

Will absorb 0.08% water in 24 hours at room temperature. This means that drying is not normally necessary. If it is necessary (shown by streaks in the molding), dry in a hot air oven for as short a time as possible and at the lowest temperature, for example, try 1 hour at 60° C (140° F) or 30 minutes at 60° C (140° F) in a desiccant dryer. Regrind tends to absorb more moisture than virgin material and so may require a slightly longer drying time. 

Injection molding. High moisture concentrations in thermoplastics that are injection molded can result in nozzle drool, foamy melt, lower melt viscosity, flow lines and silver streaks in the gate area, rough or scaly part surface, voids in the part, poor dimensional control, and reduced mechanical properties. 

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