This section provides an overview for straight core pins as well as their applications and principles. Also, please take a look at the list of 8 straight core pin manufacturers and their company rankings.
Table of Contents
A straight core pin is a type of molding metal fitting used in the manufacture of plastic products, especially those that are straight.
Molds for injection molding are usually made by cutting. While this processing method is suitable for drilling, it is said to be difficult to create protruding shapes due to the amount of work and accuracy. Therefore, straight core pins and other core pins are used when installing protrusions in molds. Straight core pins make it possible to install a straight hole in the molded product, but various other shapes of core pins are also known, including tapered core pins.
Straight core pins are generally used to create holes or slots in molded plastic products. In addition to functional needs such as rotary shafts, bearing holes, and threaded holes, these holes and slots are also used to reduce weight and area, and as venting holes.
Of these cases where gas venting is required, gas generation is often particularly noticeable when new materials containing multiple components are used, and it has been observed that conventional air vents and gas vents cannot be used in areas with minute Structure of or special geometry.
Straight core pins for gas venting are widely used because they can easily and efficiently release gas by placing a core pin at the location where gas venting is required, and by using a thin pin, gas venting is possible even for molded products with minute shapes such as electronic components.
When straight core pins are used for molding applications, they are installed in the core or cavity of the molding fixture. However, depending on the diameter of the hole, the core pin may be pushed or bent by the injection pressure of the resin when filling with molten resin, or the hole may be displaced. For through holes, the length of the hole should be less than twice the diameter of the hole. In the case of a through-hole, the length of the hole can be extended to about 8 times the hole diameter if the hole is fixed on one side and supported on the other Structure of the core and cavity, the risk of breakage can be reduced by installing core pins on both sides of the core and cavity to butt them together. On the other hand, if the accuracy of the metal fittings is low in this Structure of, the hole may not open due to poor alignment, so care must be taken.
In the majority of cases, the forming of holes created with straight core pins is required for the function of the product. On the other hand, hole molding is a Structure of many disadvantages, as it reduces the strength and rigidity of the molded product, increases the possibility of weld lines and other appearance defects, and increases the cost of creating the mold. Therefore, it is important to avoid problems by taking measures such as setting the appropriate structure and distance between the holes when designing.
*Including some distributors, etc.
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