The desk organiser seen opposite has a steel wire frame and plastic shelves. The selves have been folder on a strip heater. This heats the plastic along a line so that it becomes soft and flexible. It can then be folded to almost any angle. Thermoplastics such as Acrylic (Perspex) are most suitable for this type of product as they can be shaped when heated.

The diagram below shows the ‘disassembled’ desk organiser. The shelves have been removed to reveal the steel frame behind it. When the shelves clip back on to the frame, the organiser it forms can ‘free stand’ on a desk. The desk organiser can be used to hold folders and paper etc.....

STAGES IN THE MAKING OF A SHELF

STAGE ONE: The position of the fold is marked with a china-graph pencil. With this type of pencil line can be removed easily later.

STAGE TWO: The plastic is placed across the rests, above the heating element

STAGE FOUR: When the plastic becomes flexible it is placed in a ‘jig’. The jig is made to the correct angle, 90 degrees in this case. A square section block is then pressed against the plastic to hold it in position as it cools.

STAGE FIVE: A second line can be drawn on the plastic with a china-graph pen, heated and folded in the same jig. The shelf is complete.

QUESTIONS:

1. in the space below, draw a diagram to explain how the shelves can be attached to the steel frame. It must be possible to remove the shelves so that they can be stacked separately.

2. A potential design fault has been noticed. The steel frame is scratching the desk top. This due to the steel frame making direct contact with the desk surface. On the frame seen below, draw an alteration to the design that will prevent this problem occurring.