The present invention is related to a polymer molding and processing technique, and more particularly to a method for filling a blank into a mold.
Different polymer materials have different properties and polymerization reactions. Therefore, different polymer materials necessitate different molding and processing methods. In some conventional molding and processing techniques for the polymer material, the polymer material is previously made into a fixed amount of blank with a certain shape. Then the blank is placed in a mold and a certain pressure and a certain heat are applied to the blank. Accordingly, the blank of polymer material is polymerized and molded into a specific product with a desired configuration.
However, the above techniques are still not optimal so that the manufacturing efficiency can be hardly enhanced. This is because that the temperature of the mold rises after the blank is filled into the mold. The temperature of the mold rises for giving heat to the polymer material inside the mold so as to provide a necessary reaction temperature. As a result, in the manufacturing procedure, an independent time is necessary for the rise/drop of the temperature of the mold. Therefore, as a whole, the manufacturing efficiency is limited and cannot be promoted.
It is therefore a primary object of the present invention to provide a method for filling a blank into a mold. According to the method, in the polymer molding procedure, the time for rising the temperature of the mold is greatly shortened so that the manufacturing time is shortened. Therefore, the manufacturing efficiency of the polymer product can be enhanced.
It is a further object of the present invention to provide the above method for filling the blank into the mold. When the temperature of the mold rises to a certain temperature, the blank is filled into the mold cavity so as to prevent the blank from melting, bending or deforming due to the excessively high temperature of the mold.
According to the above objects, in the method for filling the blank into the mold, the temperature of the mold is previously risen to a predetermined temperature. When the mold is positioned in a mold-opened position, a fluid is used to cool the surface of the mold cavity of the mold into which the blank is to be filled so as to lower the temperature of the surface of the mold cavity. Then blank is placed into the mold cavity and the mold is positioned in a mold-closed position.
The present invention can be best understood through the following description and accompanying drawings wherein:
Please refer to
It should be noted that in step c, the first blank can be alternatively molded by means of another conventional polymer molding technique such as pressing. In addition, in step f, the lower temperature fluid can be a low temperature gas carbon dioxide, low temperature gas nitrogen or water. All those fluids without public danger can be used as the low temperature fluid. Also, in step g, the second blank can be filled into the mold cavity by means of different measures as necessary. For example, the second blank can be manually placed into the mold cavity or by means of a certain apparatus.
The above method is characterized in that the temperature of the surface of the mold cavity into which the second blank is to be filled is lowered. Accordingly, after the second blank is filled into the mold cavity and before the mold is closed to mold the blank, the blank is prevented from bending or deforming due to the excessively high temperature of the surface of the mold cavity. Therefore, the quality of the product will not be affected. Moreover, in the method of the present invention, the fluid does not lower the temperature of the entire mold, but only lower the temperature of the surface of the mold cavity. Therefore, after the temperature of the surface is lowered, the time for the temperature to restore can be shortened so that the manufacturing procedure will not be delayed. Therefore, the manufacturing efficiency of the polymer product can be enhanced.
It should be especially noted that in the method for filling the blank into the mold of the present invention, the mold is simply locally cooled, that is, only the surface of the mold cavity is lowered. In actual application, such measure can be combined with other known polymer processing techniques such as injection molding technique.
The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiments can be made without departing from the spirit of the present invention.
Number | Date | Country | Kind |
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094112250 | Apr 2005 | TW | national |