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Plastic
Product Design
NPI Plastics is a manufacturer of specialty plastic polymers or customized resins for plastic product design. Using recycled post industrial scrap, our specialty polymers include high density polyethylene: NPI – 04HDPE Mixed Color, linear and low density polyethylene: NPI – 01LL/LD Mixed Color and polypropylene polymers: NPI – 10PP212 Mixed Color. All our polymers are manufactured from recycled plastic and offer injection and extrusion processors a quality alternative to virgin resin. If you're looking for a supplier of reprocessed scrap resins to mix with your virgin resin, our products can be used to make new plastic products and are available in pellet material form.
Designing a Plastic Product
The successful design of products using recycled plastic resins not only
requires the right product concept and the right design tools and so on,
but the right materials. More than any other material, products made from
plastic must be designed for the process or method of production. Anybody
can design a plastic product, but it takes an expert knowledge of the
injection molding process and how injection molds work to create a product
that is cost efficient to make and that consumers will want to buy.
It is no great secret that plastics have very different structural characteristics and properties than other materials, i.e., metals. But even a common term like stress has a very different implication for a plastic product than it would have for other materials. The real question is how do these differing material properties and characteristics effect the design process?
Plastics are thought of as a low cost material but in reality they are fairly expensive when viewed from a unit volume or load bearing basis. Plastic components end up being low cost due to the high speed of the injection molding process. With this in mind 100% plastic products are not always the best way to get the most cost effective product. Plastics in general can handle intermittent loads well but will deform permanently under even low levels of long term applied loads. Frequently no reasonable amount of plastic can be added to a design to overcome this characteristic so instead a few load bearing metal components added to a primarily plastic design will result in a superior product.
Plastic Design and Resin Selection
Selecting the right material is critical to your successful design of
a new plastic product. Today's plastic designers are confronted with a
myriad of design considerations, coupled with an ever growing number of
available resins and specialty polymers. The problem lies in fully knowing
what will be required of the product in a wide range of environments along
with understanding the true functional behavior of the polymer. Like many
other materials, plastic has a host of different properties under the
categories of physical, mechanical, thermal, and electrical. There are
also several properties peculiar to plastic that are important for processing
them.
Selecting the Right Resin for the Right Process
The most important processing and physical properties for specialty polymers
include viscosity, shrinkage, and melt flow index.
Blow molding and extrusion processes tend to use lower melt flow index,
while injection molding typically uses a higher melt flow index.
1. Viscosity, a measurement of a fluid's resistance to flow, controls
how well a resin fills the cavities or voids in a mold.
2. Shrinkage is the maximum percentage of linear shrinkage that
occurs after drying, setting, and/or curing.
3. Melt flow index (MFI) is the output flow rate in grams that
occurs during a 10 minute period.
Contact
us today: Toll Free: 1.800.463.6169
The Ownership and Management
Nexcycle Plastics Inc.
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