Plastic Strapping Machines - How they work
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An article is placed on a strapping machine table (31) - a slide anvil (32) is used for releasing the article from the table (31) after the strapping operation is completed and is movable in the transversal direction and the lower surface (32') of the slide table forms a horizontal surface.
A micro-lever (33) is placed under and to the slide anvil (32) under to detect when a plastic strap (B) is taken over a package andits leading end is inserted back under the anvil
A center guide (34) is used to guide the plastic band (B) into an arch guide in the automatic system; or a band projection guide in a semi automatic system; the center guide (34) is movable in the transversal direction.
A first gripper (35) grips the end of the plastic band (B) between the underside of the anvil (32) and the gripper when the plastic band (B) is fed so as to contact with the micro-lever (33).
A feeding and tightening mechanism (36) for the plastic strapping band (B) comprises a feed roller (37), a return roller (38). When the band (B) is pressed on the feed roller (37) by a rocker roller (39), the band (B) is fed out. When the band (B) is pressed on the return roller (38) by a rocker roller (40), the band (B) is tightened. A compression plate (41) has flat horizontal surface (41') as its upper surface and is pivoted to the shaft (42') of a compression rod (42). A stopper for the compression plate (41) is adjusted to give an angle β for feeding the band (B) by the horizontal surface (41'). The compression rod (42) is hollow and a spring (52) and a leg (43) are kept in it and a roller (44) is connected at a lower end of the leg (43). The roller (44) is always contacted with the cam ring (46) connected to a cam shaft (45). A tensile spring (48) is fitted between the rod (42) and a pin (47) mounted on a frame. A second gripper (42") is projected at the upper end of the rod (42). The band is gripped between the second gripper (42") and the slide table (32) by the elevation of the rod (42) depending upon the cam ring (46) after tightening the band (B)
The spring (52) is used for the gripping. A cutter plunger (49) has a hollow part and a leg (50) and a spring (52) are kept in the hollow part. A roller (44) connected to the lower end of the leg (50) is contacted with a cam ring (51). A tensile spring (53) actuates to pull down the cutter plunger (49). The upper surface of the cutter plunger (49) is contacted with the compression plate (41). When the plunger (49) is elevated by the cam shaft, the compression plate (41) is pulled up by its upper surface. A cutter (54) is projected upwardly from one side of the plunger (49) and the band (B) is cut between the cutter and the side surface of the first gripper (35). The first gripper (35) has a hollow part and a spring (52) and a leg (55) are kept in the hollow part. A roller (44) connected to the lower end of the leg (55) is always contacted with a cam ring (57). A tensile spring (56) is fitted.
Although one embodiment of the band-feeding and tightening system has been illustrated, it is possible to modify the band feeding and tightening system as desired in view of the conventional structures.
Referring to FIGS. 1 and 2, one embodiment of the semiautomatic-automatic strapping machine in the form of the automaticsystem will be illustrated.
A casing (2) is covered by a table (3) having a longitudinal gap (4) for passing a plastic band (B). A heat-pressing part (5) is located in front of the feed roller (7) so as to melt-bond the end of the plastic band (B) overlapped on the other end of the plastic band (B) by pressing and heating the overlapped part of the plastic band (B) between the receiving part (6) and the heat pressing part (5). The feed rollers and the return rollers (7), (7') and a band roller (8) are used for feeding and tightening the plastic band (B). A package (G) is strapped by the plastic band (B). An arch (11) is fitted on the upper side of the casing (2) with a fitting such as a nut and a bolt or a key. The arch (11) has an arch guide (13) which is opened by the tightening force of the plastic band (B) wound along the arch guide. The lower part (13'), (13') of the arch guide (13) has a space (14') in which a band gripper is located. One end of the lower part (13') of the arch guide (13) is adjacent to a center guide (34) as shown in FIG. 7.
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In this guide to strapping machines, we will be focusing on the types of machines available on the market today. Strapping is used to secure loads to pallets or join parcels and cartons together for security during shipping. There are a few types of strapping used for shipping and transport: baling strap, composite strapping, PET (polyester) strapping, PP (polypropylene) strapping, steel/stainless steel strapping and woven strapping.
Strapping machines are usually used at the manufacturing end of the supply chain by companies assembling their goods for transport out of the factory floor to customers across the country or overseas. Strapping machines cut down the time and simplify the strapping process and improve efficiency.
Powered by electricity, strapping machines eliminate the use of handheld tensioners and cutters. The hard work is done by the strapping machine within seconds and provides a secure consistent application on bulky loads or securing seals on cartons and binding odd-shaped items together.
The machine is preset by an operator, so the correct tension and strength are customised for the consignment.
There are fully automated, semi-automated machines and handheld strapping tools. In this guide to strapping machines, we will focus on electrically operated versions.
Automatic strap machines are a big investment but if you have a busy operation, they will save you time and money, paying for themselves within months. A premium machine can apply a maximum of 65 straps per minute. In one quick action, they strap, seal and cut within the preset parameters by the operator. Once the parcel is set in place, the tension is set, a press of the button completes the strapping process in seconds.
Semi-automated machines are less expensive than fully automated machines. It’s a viable option if you have a lower volume operation. They can strap up to 24 times per minute with some operator participation. These machines will strap, tension and cut to preset parameters after the operator feeds the strapping manually around the parcel or load. It takes longer to strap a parcel than the automated machine but still simplifies the strapping process in one simple action.
Both the semi and fully automated machines operate in the same manner. From a reel dispenser, the strapping is fed into the machine. Once the consignment is placed in the correct position on the machine, a button is pushed and the strap is applied. Semi-automated machines require the operator to feed the strap over the other side of the parcel and back into the machine to complete the second strap. Automated machines do the whole process for you and take less time. Once the parcel is complete it gets removed and the next one is placed in position for the strapping process. And on it goes, till all your consignments are ready to hit the loading dock ready for departure.
Strapping machines eliminate strap damage such as splitting and bending with a feed system, a strap tensioning device and cams to prevent scratching. Most strapping machines are portable, mounted on casters they can be wheeled around to different workstations as needed. They can come in different sizes, from light-weight to heavy-duty.
There are various types of strap machines available. Low table strapping machines are built closer to the ground to allow easy strapping and shifting of tall or heavy boxes. Tabletop strapping machines are for easy to lift, smaller boxes and parcels, saving a lot of back bending. The higher-end models come with an adjustable table height. Side action strapping machines have the strapping head mounted on the side of the machine frame to protect it from dust and water which means it is great for dusty, moist or harsh working environments such as sawmills, brick and tile plants.
Arch strapping machines can be either automatic or semi-automated. Their strapping time is much quicker than tabletop strappers and they are less reliant on an operator. They are a bigger investment and are more suitable for large supply chain operations.
The dimensions of the arch are dependent on the size of the goods being strapped. The internal dimensions of the arch will inform your choice of machine. To determine the speed of the machine you need, working out the strapping rate you require to keep up or grow your operations is essential.
Strapping tables are usually semi-automated and require some form of manual operation. They are more suitable for low to medium volumes of production. Position the goods on the table, manually placing the strap in position and pressing the button or foot pedal to strap the goods, remove the item from the table and repeat the process over. These machines are less expensive and highly versatile. Because these machines don’t have an arch which predetermines the maximum size of the items, volumes can vary.
If your business is ready to move on from hand-held strapping tools, then strapping machines are your answer to speeding up your processes and increase your efficiency. Coupled with portable flexible conveyor belts, your strapping process will be streamlined, safer and faster. Your staff can be assigned to other processes in your operations while your machine does the heavy work for you.
We hope this guide to strapping machines has helped you to decide on how soon you need to upgrade your strapping processes and what type of machine you require to make it happen.
Contact us to discuss your requirements of Strapping Machine Supplier. Our experienced sales team can help you identify the options that best suit your needs.