Plastic packaging cut fingers manual#

The system works well with certain materials including non-wovens and foams.

The setting time can be reduced by using an automatic knife-positioning system. Although the knives take longer to position, they stay sharp longer than razor blades. This system is used widely on paper, films and foils. Male and female circular knives engage to give a scissor cutting effect. Although the razor blades are of low cost, they need to be frequently changed to ensure a good quality slit edge. Razor slitting, which is ideal for thin plastic films – the system is very simple and quick to set.The slitting section has four main options: Some machines have a driven unwind which reduces the effect of inertia when starting to unwind heavy rolls or when the material is very tension-sensitive. The unwind stage holds the roll stably and allows it to spin it is either braked or driven to maintain accurate tension in the material. Slitter rewinders are normally used to slit plastic films, paper and metal foils. When the term 'slitter rewinder' or 'slitting machine' is used to describe the machine, the three parts are referred to as the unwind, the slitting section and the rewind. The material is fed from the uncoiler, through the nip between the two circular cutting wheels (one on top and another underneath), and then re-wound in slit pieces on the recoiler. Machinery įor metal coils, the slitter consists of three main parts: an uncoiler, slitter, and recoiler. Also, the geometry of these rolls is determined by specific tolerances in addition to the type of material and workpiece thickness.

However, the occurrence of rough edges known as burrs is commonplace on slit edges. This continuous production process is economical yet precise usually more precise than most other cutting processes. Two cylindrical rolls with matching ribs and grooves are used to cut a large roll into multiple narrower rolls. Instead, a modified form of shearing is used.

Plastic packaging cut fingers manual#

The machines can also incorporate extensive automation to precisely control material tension, automatically position the slitting knives, automatically align the cores onto which the material is wound and to reduce manual handling of the rolls.Įxamples of materials that can be cut this way are: adhesive tape, foam, rubber, paper products, foil, plastics (such as tarps and cling wrap), glass cloth, fabrics, release liner and film.įor harder materials, such as sheet metal, blades cannot be used. Depending on the industry and the product that is being slit these machine can run between 10m/min (special metal webs) and 5000 m/min (paper making process). Some machines have a program that monitors the blades and sharpens the blades often to maintain the quality and precision of the cut. The process is used because of its low cost and high precision for mass production. The slit material is rewound on paper, plastic or metal cores on the exit side of the machine. Some machines have many blades and can produce a number of output rolls at once. The cutting blades can be set to a desired width. Some blades cut through the material while others crush the material against a hard roll. Razor blades, straight, or circular blades are being used. Several methods are available for soft materials like plastic films, textiles, adhesive tapes, and paper. Apart from the stability benefit it is also then possible to put very long lengths, (frequently many tens of kilometres), onto one bobbin. For particularly narrow and thin products, the pancakes become unstable, and then the rewind may be onto a bobbin-wound reel: the rewind bobbins are much wider than the slit width and the web oscillates across the reel as it is rewound. For rewind slitting the machine used is called a slitter rewinder, a slitter or a slitting machine – these names are used interchangeably for the same machines. The multiple narrower strips of material may be known as mults (short for multiple) or pancakes if their diameter is much more than their width. In rewind slitting the web is unwound and run through the machine, passing through knives or lasers, before being rewound on one or more shafts to form narrower rolls. In log slitting the roll of material is treated as a whole (the 'log') and one or more slices are taken from it without an unrolling/re-reeling process. There are two types of slitting: log slitting and rewind slitting. Roll slitting is a shearing operation that cuts a large roll of material into narrower rolls.