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About Dip Coating
Dip molders plastic is any plastic molded part made
from the dip molding process. Dip molder manufacturers use a thermal
process that involves the preheating, dipping and post-heating of metal
molds. Generally, automatic dip molders machines perform this process.
High-precision is involved in plastic dip molding because the inside
of the part is an exact negative of the mold, with the same surface texture
of the mold. The outside dimensions are also controllable. Using precisely
controlled ovens, dip speeds, dip times and withdraw speeds provides
a range of wall thicknesses. Dip molded plastic is useful in many different
industries, including medical, artistic, automotive, appliances, aviation,
construction, electronics and sporting goods. This process produces many
items, such as colored plastic caps, plugs, grips and handles. It is
also used to coat products like fryer basket handles, tool handles and
outdoor furniture.
Plastisol is the most common plastic compound that is used in plastic
dip coating and with dip molders. It is a liquid at room temperature,
but once it is heated, it becomes solid and never changes its state again.
Plastisol is very good to work with because of its viscous properties
and long shelf life. Dip molder manufacturers can make Plastisol in many
different colors, surface qualities and thicknesses. It survives in radically
different environments. Other less common dip molders that are used in
the dip molding process are latex, neoprene and urethane.
When dip molder manufacturers use plastic, the first step is the heating
of metal molds that have the internal dimensions of the desired part.
The dip molder is then immersed or “dipped” in a tank of
liquid plastisol. The heat in the molders are attracted to the cool plastisol
and gels the material around the mold, forming the part. The mold is
then removed and taken to the curing ovens where the plastisol material
is fused. Lastly, the molded part is cooled, typically in water, and
then stripped from the mold and packed for shipment or secondary operations.
The other basic method, plastic dip coating, also called vinyl coating,
is slightly different, in that it produces a hard coating over an already
made plastic product, but follows basically the same process. In this
method, an item, heated or unheated, is dipped in the plastisol, which
gels around it. The item is then heated, and when it fuses, the coating
is complete.
Dip molding is an effective alternative to other plastic processes. The
expense for dip molding is lower than other processes since most dip
molders are uncomplicated and inexpensive. The automation of the process
makes it competitive with other dip molders processes since it reduces
labor costs. Dip molding produces plastisol end caps and covers a wide
variety of detailed shapes and a multitude of colors. Thermoplastic coatings
supply decorative, functional and multipurpose covers. Overall, dip molders
and coating is an attractive and innovative industry.
Featured
Articles
http://www.devicelink.com/mddi/archive/01/04/002.html
http://www.designnews.com/article/CA253874.html
Types of Dip Coating
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dispensing plastisol into a mold, placing it in an oven and then heating
it so the plastisol fuses into the finished part. This process is capable
of producing multi-colored parts.
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is used mostly for thin coatings of plastisol. In this process, the
object is dipped in plastisol without preheating, and then placed in
a heated chamber.
- is the process of submersing an object in a tank full of coating material.
- is a thermal process by which metal molds are dipped and coated.
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is the process in which an object is heated, dipped in plastisol and
then placed in a heated chamber where fusion takes place.
- are plastic covers formed through the process of dip molding.
- is a process in which metals are coated with plastic.
- are plastic caps formed through the process of dip molding.
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is a method that involves placing a limited amount of plastisol in a
mold and then rotating it as heating takes place so the liquid is equally
distributed. This is used to create hollow products.
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is the method of completely immersing an object in liquid plastisol
and then letting it gel so that the object is totally covered.
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