tailieunhanh - Warranties, Patents, and Ethical Considerations Warranties and Guaranties

185 6 Warranties, Patents, and Ethical Considerations Warranties and Guaranties When a mold maker builds a mold, it is expected to perform as quoted and to last without breakdowns for a long time. It is also expected to make the product to specifications and dimensionally correct, and at a productivity that has been estimated to the best knowledge of the designer and mold maker. Guaranteed Quality Normally, a mold maker will guarantee the quality of the mold for six months or for one year, covering materials and labor. In fact, if problems did not arise within the first few weeks or months (or the first. | Copyrighted Materials Copyright 2006 Hanser Publishers Retrieved from I 185 6 Warranties Patents and Ethical Considerations Warranties and Guaranties When a mold maker builds a mold it is expected to perform as quoted and to last without breakdowns for a long time. It is also expected to make the product to specifications and dimensionally correct and at a productivity that has been estimated to the best knowledge of the designer and mold maker. Guaranteed Quality Normally a mold maker will guarantee the quality of the mold for six months or for one year covering materials and labor. In fact if problems did not arise within the first few weeks or months or the first few thousand molding cycles after start of operation a properly designed and built mold well maintained will virtually last forever except for unavoidable wear on tapers gates etc. or when abusing the mold . by improper setup or physical damage due to negligence. Occasionally the mold maker may be asked to guarantee shrinkage cycle time or delivery time. Guaranteed Shrinkage Experienced designers or mold makers can usually foresee the shrinkage especially if they are familiar with the product. Shrinkage affects not only the dimensions of a product but sometimes also its shape by distorting the product. This can be difficult to foresee in particular with non-symmetrical and odd-shaped products. In many cases this requires experimentation before finalizing the mold or testing after some or the entire mold is finished. It could require experimenting with cycle times even changing some steel dimensions or the cooling provisions in all or in certain areas of the mold. Often the molder will provide steel sizes to the mold maker eliminating the need and cost to guarantee the plastic sizes. There are also usually only one or a few dimensions that are critical and these should be the only ones guaranteed. The possibility of the need to experiment to arrive at proper sizes should