Processing Conditions
The optimum processing conditions for a plastic are determined by the nature
of the plastic. It is important that the recommended processing conditions
be followed, subject to the experience of the molder. Molding conditions can
affect the performance of the polymer, especially toughness, mold shrinkage,
weld lines, post-mold shrinkage and surface appearance of the molded part.
You can find more detailed processing information on our processing data sheets page.
Injection Molding of Engineering Plastics
Because most engineering thermoplastic parts are fabricated by injection molding,
it is important to understand the molding process, its capabilities and its
limitations. The basic process is very simple. Thermoplastic resins such
as Delrin® acetal resins, Crastin® and Rynite® thermoplastic
polyester resins, or Zytel® nylon resins, supplied in pellet form, are
dried when necessary, melted, injected into a mold under pressure and allowed
to cool. The mold is then opened, the parts removed, the mold closed and
the cycle is repeated. (more)
Blow Molding Techniques
High performance Engineering Plastics are the material of choice for parts
requiring advanced blow molding techniques. Parison manipulation and suction
blow molding have been developed in order to produce scrapless parts (ie no
pinch weld on the finished part itself) which has led to this procedure being
termed 3D blow molding. Sequential extrusion, co-extrusion, or a combination
of both is sometimes used in order to produce a part with 2 plastic components.
At DuPont, we have the people who can help you determine the possibilities
for your blow-molded application. (more)
Extrusion
The excellent properties and processing characteristics of DuPont Engineering
Plastics qualify for many demanding applications. Properties such as mechanical
strength, dynamic flex performance, fluid and chemical resistance, and wide
service temperature range have led to the use of Engineering Plastics in many
extruded products, including hose and tubing, belts, extruded profiles, rope
and cable covers, sheeting and films. (more)
Foaming Techniques
Foam molding offers the possibility of increasing the size of a part without
increasing weight and reducing the weight of a part with controlled change
of properties. Other valuable advantages for foaming are cycle time reduction,
improved dimensional uniformity, and increase cavitation in a mold. All of
the attributes can be used to increase the productivity of an application.
All of EP’s products can be foamed using one or more standard foaming
techniques. Common foaming techniques are chemical foaming, MuCell®¹ micro-cellular
foaming and structural foaming. (more)
MuCell®¹ is a registered trademark of Trexel Inc.
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