Layer-by-layer unpacking machines use claws to grab and lift bags. The claws are set on a single plane with a grabbing depth of 80-100mm. About 80-90 claws are installed to hold the bags securely. For the process to work well, the claws must grab as many bags as possible. Bags are usually stacked in layers of five. However, some stacks can become uneven due to various factors. When the grabbing mechanism moves down, it lands on the highest point of the stack. The grabbing depth is fixed, so if the height difference exceeds 60mm, the claws cannot reach the lower bags. This may result in only a few bags being grabbed, or even just one or two claws holding a bag. If only a few claws grab a bag, material may leak from the hooked area. When the cutting blades open the bag, the cut may be incomplete. This can cause problems like reduced efficiency or bags falling into the hopper. XUNLI’s unpacking machine has a unique design to handle uneven stacks better. It reduces issues caused by uneven surfaces. Still, for the best performance, stacks should be as flat as possible.

Some well-known bag emptying machine manufacturers claim processing capacities of over 1200-1300 bags per hour. They also state emptying rates exceeding 99.98% or 99.99%. These claims suggest their machines can achieve both high speed and high emptying rates at the same time. However, this is not realistic. At 1200 bags per hour, each cycle takes only 15 seconds. At 1300 bags per hour, it drops to 13.8 seconds per cycle. Such short time frames do not allow the machine to fully empty the bags. As a result, material wastage becomes significant. Therefore, processing capacity alone is not meaningful. It must be paired with an achievable emptying rate within the given time. High speed claims are irrelevant if the machine cannot empty bags properly.

The layer bag slitter uses rotating circular blades to cut open bags from the bottom as they pass through. The corners of the bags are also trimmed, creating bag debris of various sizes. This debris can mix with the material and disrupt the transportation system. Additionally, bag debris often contains printed logos or patterns. This can cause minor defects in the final product, especially for plastic manufacturers. In industries like film and blown film, bags are typically made of PE (polyethylene), while the product material is PP (polypropylene). If PE debris mixes with PP material, it can create defects like spots due to their different melting points. To avoid these issues, it is crucial to minimize bag debris during cutting. The equipment must also effectively remove any debris from the material.

There are three main reasons: 1.Dust Accumulation on Components The machine’s top has many mechanical and electrical parts. Fine powder dust spreads easily and accumulates on these components. Due to the machine’s height and complexity, cleaning these parts is difficult. 2.Inefficient Emptying of Powder Materials Most layer bag slitters work well for pellet materials but struggle to fully empty powder materials. This leads to significant material losses. 3.Lack of Dust Control at the Bag Entrance The bag entrance is large, and most layer bag slitters lack proper dust control. This causes dust leakage during operation.