BLADE AND

BUSHING

LUBRICATION

Blade and bushing lubrication can nearly always improve the quality of cutting.

Description of the cutting process

Unlike sawing, a rotary knife cutter displaces material rather than removing it. When the knife blade first contacts the extrudate, it pushes it against the opposite side of the cutter bushings. If there is too much clearance the extrudate may crack or distort before cutting even begins. Tubing may devel- op two distinctive marks related to the compression of the tube.

Once the blade penetrates the part, material is displaced to either side of the blade. This displacement will vary in degree and visibility depending on the type of material, temperature, blade thickness, blade style, and blade speed. As the material is displaced, heat is generated and passed to the blade surface.

Flexible materials (flexible PVC, urethanes, and even LDPE) will generally compress during cutting, leaving little or no sign of displacement. The cut will appear uniformly glossy and free of fracture. However, a closer look will show very fine lines on the cut face. With flexible materials, these lines will typically show an arc or "S" pattern which can be attrib- uted to compression of the part as the blade passed through.

Rigid materials such as rigid PVC and styrene will tend to fracture during cutting. The cut surface changes from glossy to dull, and finally becomes whitened and rough. Whitening occurs when cutting changes to fracturing: the cut begins to extend in front of the cutting blade, which acts as a wedge. At this point, you can only hope the fracture is controlled, allow- ing for a square cut.

Friction and heat during cutting

Because most rotary knife cutters don't travel with the flow of the extrusion line, forward motion is interrupted as the blade passes through the plastic tube or profile. This interruption causes friction, which generates heat in the cutting blade. As the temperature of the blade increases, plastic is melted at the cut site. This melted plastic can adhere to and coat the cutting blade, especially on the upstream side, and be transferred to the next part in the form of hairs or tissue-like film. This will be especially noticeable on the top inside of the tube or pro- file.

D-1 APPENDIX

BLADE AND BUSHING LUBRICATION

UGE059/1003

Page 110
Image 110
Conair SC-5 manual Blade Bushing Lubrication, Description of the cutting process, Friction and heat during cutting

SC-5 specifications

The Conair SC-5 is a powerful and versatile styling tool designed to elevate your hair care routine. Renowned for its innovative technology and user-friendly features, the SC-5 caters to a wide range of hair types and styling needs, making it a favorite among both professional stylists and at-home users.

One of the standout features of the Conair SC-5 is its advanced heat technology. With fast-acting heating capabilities, the device warms up quickly, allowing users to create their desired styles in no time. This is complemented by multiple heat settings that provide optimal temperatures for different hair types, ensuring that whether you have fine, medium, or thick hair, you can achieve a beautiful look without causing damage.

The SC-5 is equipped with a high-quality ceramic plate that distributes heat evenly, reducing the risk of hot spots that can scorch the hair. The ceramic technology also helps to lock in moisture and reduce frizz, leading to smooth, shiny results. Additionally, the device features a built-in ionic generator, which emits negative ions that combat static electricity and enhance hair's natural shine.

Portability is another key aspect of the Conair SC-5. Its lightweight design and compact size make it easy to handle and travel with, catering to those with an on-the-go lifestyle. The swivel cord ensures that you can maneuver freely without the hassle of tangled wires, adding to the ease of use.

Safety is also a priority with the SC-5. It comes with an automatic shut-off feature, providing peace of mind for users who may forget to turn off their devices after use. This is particularly useful for busy individuals, ensuring both safety and energy efficiency.

In conclusion, the Conair SC-5 combines cutting-edge technology, user-friendly features, and safety elements to deliver an outstanding hair styling experience. Whether you seek to achieve sleek straight hair, voluminous curls, or anything in between, the SC-5 is designed to meet your styling needs while maintaining the health and integrity of your hair. With its impressive lineup of characteristics, this device is sure to become an indispensable part of your styling toolkit.