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Laminated Veneer Lumber as raw material usage for server ramps

IP.com Disclosure Number: IPCOM000246132D
Publication Date: 2016-May-11
Document File: 8 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

A new raw material's testing period - raw material used for server racks' ramp. The publication proves with testing cycles that the usage of new material available on the market can generate significant cost saving by eliminating elements from a general server rack's ramp with the same or better performance. With latter a more strong solution can be designed which affects human and product safety areas as well.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

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Laminated Veneer Lumber as raw material usage for server ramps

The main objective for developing a new ramp design was • to make it cost effective, • more robust, • ease-of-use - no tool is needed to connect to a pallet
• widely available on the market


• recyclable, built according to current corporate/industrial standards

Nowadays there are several types of ramps available on the market as individual products/accessories of machines and equipments. They can be sorted based on their raw material, as ramps made from steel, plastic and wood. If the equipment returning process is in scope, the wooden ramp is a good solution as offers a light-weight, easy manufacturability and low-cost solution.

General ramps as packaging components are mostly built of commercial plywood - ply direction is alternated with 90° within one board. This material is widely available in all GEOs.

Its major disadvantage is that almost half of the plies withstands against compression considering normal usage (board acts as a ramp, force stands vertically onto the board).

This feature is more than enough for a normal ramp itself, because the typical stress is dynamic - a one-direction moving, compression force. It is because geometrically the ramps are long and narrow packaging elements, ratio of length/width is 4-8.

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Picture 1. Storage Server pallet with ramps

From above facts a clear deduction can be stated - the plywood as raw material is "overdesigned" for relatively long and narrow packaging components.

The perfect plywood would be where the direction of all plies is the same. On the market, within the basket of a supplier NEFAB AB a special type of plywood can be found which fulfills above requirements - this is Laminated Veneer Lumber (later as
LVL) which can be well known for housebuilders as e.g. beams are made of it as they withstand mostly against static forces.

The aim of the publication is to present a clear comparison of raw materials (plywood vs. LVL) and designs made from them.

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Ramp design solution:


1. Previous ramp of DS8000 Storage Server was made of plywood, 2.5 mm thick steel U channel was mounted onto to improve compression strength.

Picture 2. Drawing of DS8k Storage Server plywood ramp


2. Current ramp is made of LVL, no steel channel mounted on it only two cleats as guides for casters.

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Picture 3. Drawing of DS8k Storage Server Laminated Veneer Lumber ramp

Bodies of both, previous and current ramps are 36 mm thick, their length remain unchanged.

The new ramp has a redesigned Z bracket on its ramp's end - no mounting bolts are needed to fix to the pallet, flanges are folded out to act on behalf.

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Comparison:

A general compression strength test can discover weak points of designs. Tests were performed by a local University's accredited lab.

Tester has 30kN measuring limit, that fits to the requirements as:

- maximum weight of the product is cca 1...