Brother International PR-620 Users Manual - English - Page 181

APPENDIX Creating Beautiful Embroidery The various precautions concerning the thread, embroidery frames and stabilizers (backings) that must be observed in order to create beautiful embroidery are described below. Threads Embroidery thread can be costly, therefore caring for it should be a priority. No matter how well a thread is manufactured, it must be appropriately stored if it is to sew properly. This is especially true when one considers the time that lapses between delivery to the thread user and the moment the thread is actually used on the embroidery machine. It is important that embroidery threads be stored in an environment that is free of damaging agents such as excessive heat, light or moisture. Embroidery threads are best stored in an area that is as clean and dust-free as possible. It is also important that the storage area be free of smoke, fumes and gases. Certain gases may cause the thread to yellow. These fumes originate from such appliances as gas heaters or from gas or diesel engines. Direct sunlight is also extremely destructive for embroidery threads. Boxes of thread should not be left open and exposed to direct sunlight. If possible, skylights and windows should be diffused. The best type of lighting for embroidery thread is tungstenfilament or fluorescent tubes. It is important to remember that prolonged exposure to these harmful sources may also cause the colors of cardboard boxes and other objects to fade. Temperature and humidity also pose a threat to embroidery threads. The ideal conditions are between 59 °F and 77 °F (or 15 °C and 25 °C). Humidity should be between 40% and 60%. These conditions should be kept as constant as possible in order to prevent mildew from forming. Excessive temperatures can also cause lubrication problems that ultimately result in thread breaks. Damp conditions can affect paper bobbins as the cardboard will swell and the thread can become oversized. It is also important to realize that even if the overall storage conditions are good, there may be "spot problems" where a thread is exposed to a heat source or bright lights. Ensuring that thread does not become damaged requires that stock be frequently rotated and that threads are not left in the same place for an extremely long time. Choice of thread is a major factor in improving production time. The thread run ability, strength, consistency and weight all affect output. These qualities determine how well the machine will sew and the number of thread breaks during sewing. Thread breaks have an important influence on production. Each thread break reduces output by at least 0.07% a day (7.5 hours), assuming that it takes 20 seconds to rethread a needle. For every reduction of 14 thread breaks per a day, output can be improved by more than 1.0 %. 164