Search:

Custom Case Manufacturers Term Glossary

Fragility Index - the fragility of an item is measured and reported numerically as its fragility Index (Expressed in Gs). It provides a basic parameter for packaging engineers to use in the selection of cushioning materials.

The fragility index is the maximum G force that an item to be packaged can withstand without sustaining damage.

Impact Dissipation - the ability of packaging material to provide deceleration, or absorb the force of impact across its available space, thus preventing damage to the product it protects.

G Force - the acceleration of gravity (32.19ft/sec/sec)

Drop Height - based on the probable handling environment of the package and its delivery system, the distance it is likely to be dropped.

Cushioning Curve - a graphical representation of the dynamic cushioning properties of a packaging media. It is determined by dropping varying masses of a specific size from a defined height onto a specimen of the product to be tested.

Defined for each curve is the drop height and the specimen thickness. Throughout the use of varying specimen thickness drop heights, a products dynamic cushioning characteristics are depicted.

Static Loading - the weight of the product distributed over the foam surface area expressed in pounds per square inch (psi).

Loadbearing Area - calculated by dividing the highest static load into the weight of the product.

Internal Dimension (I.D.) - these are the internal dimensions of the case.

Outside Dimension (O.D.) - these are the external dimensions of the case.

Parting Line - the section in which the lid and base separate from each other.

Polyethylene foam (Aka HDPE) - Closed cell, high density foam that is resistant to solvent, oils, greases and most common chemicals.

This material is available in densities ranging from 2.0# density to 9#. This foam meets the PPC-1752D spec and is also available in a special Military grade.

ELE Foam (Ether like Ester) - Open cell, low cost polyurethane foam that has the look and feel of poly-ester foam. Available in 1.6# density.

It is grey in color and is the most common foam used in the shipping case industry.

Anti-Static foam - an open cell polyurethane foam with the addition of anti-static chemical additives. Anti-Static foam is available in 1.2# - 2.0# densities and is pink in color.

Rotationally Molded - The rotational molding process is a high temperature, low pressure plastic forming process that uses heat and biaxial rotation (i.e. rotation on two axes) to produce hollow, one piece parts.

The rotational molding process consists of four distinct phases:

1- Loading a measured quantity of polymer (usually in powder form) into the mold.

2- Heating the mold in an oven whilst it rotates, until all the polymer has melted and adhered to the mold wall.

The length of time the mold spends in the oven is critical- too long, and the polymer will degrade, reducing impact strength. If the mold spends too little time in the oven, melting of the polymer may be incomplete.

The polymer grains will not have time to fully melt and coalesce on the mold wall, resulting in large bubbles in the polymer. This has an adverse effect on the mechanical properties of the finished product.

3- Cooling of the mold, usually by fan.
This stage of the cycle can be quite lengthy too- the polymer must be cooled to a temperature where it solidifies and can be handled safely by the operator. This typically takes tens of minutes. The part will shrink on cooling, coming away from the mold, and facilitating easy removal of the part.

The cooling rate must be kept within a certain range- very rapid cooling (e.g., by water spray) would result in the part cooling and shrinking at an uncontrolled rate, producing a warped part.
4- Removal of the part.

Injection Molded - a manufacturing technique for making parts from plastic material. Molten plastic is injected at high pressure into a mold, which is the inverse of the desired shape and is then clamped together and solidifies into the shape of the mold creating the part.

Blow Molded - a manufacturing process by which hollow plastic parts are formed. In general, there are three main types of blow molding; Extrusion Blow Molding, Injection Blow Molding, and Stretch Blow Molding.

Thermal Formed - see vacuum formed.

Vacuum Formed - a simplified version of thermoforming, whereby a sheet of plastic is heated to a forming temperature, stretched onto or into a single-surface mold, and held against the mold by applying vacuum between the mold surface and the sheet.

TSA Lock - TSA-accepted padlocks work two ways: a combination lock for the owner, and a separate TSA coded keyhole for access by airport baggage screeners. This way they can inspect your baggage without ruining your lock or case they are trying to get into.

Pressure Relief Valve - a purge valve that provides you the ability to release any built-up internal air pressure. A more accurate term would be a pressure equalization valve.

About the Author (text)

Neil Lemons represents Cases By Masco, providers of durable transport best free people finder

Please Rate this Article

Not yet Rated

Click the XML Icon Above to Receive Computers Articles Via RSS!

Additional Articles From - Home | Computers

Tetris epoch or game in glass - By : Tetris Club
Online Computer Training – The Method To Becoming Competitive - By : Matthew12 Peschong12
Review before you buy! Digital Cameras, Electronics, Computers, Accessories etc. - By : tcnmart
How To Avoid Damaging Your Hard Drive - By : Rokai Kolam
Why Online Calculators are Important for Businesses - By : Amit Mazumdar
What's Inside A Computer Hard Drive? - By : Victor Epand
Why Is My Computer Running So Slow? - By : Ben Needles
Checking Your Computer's Capacity And Performance - By : Victor Epand
Updating Your Computer For Gaming - By : Victor Epand
The means to get more out of the PDA phones - By : Steve152 Rastall152

	Print This Article
	Post Comment
	Add To Favorites
	Email to Friends
	Ezine Ready

Visit For Great Skin
Skin Care
Skin Treatments
Skin Care
Acne

More Funstuff
Love & Dating Tips
Personality Tests
Myspace Graphics
Love Quizzes
Myspace Comments
Friendster Layouts
hi5 Layouts
quotes
birthday today
acronyms
dating advisor
cool music videos
bollywood videos