Sling sewing machine

A heavy-duty upholstery sewing machine is designed to handle thick, heavy fabrics such as canvas, denim, leather, and upholstery materials. Unlike standard sewing machines, which may struggle or even break when faced with multiple layers of heavy fabric, heavy-duty machines are equipped with robust motors and specialized features that allow them to sew through these challenging materials with ease. They often come with powerful needle systems and a strong feed mechanism to ensure consistent stitching.

The Art and Efficiency of Swing Needle Sewing Machines

1. Multiple Thread Capability Most industrial sergers are designed to handle multiple threads, allowing for various stitch types. This variability is crucial for different fabrics and ends up reducing the likelihood of fraying or unraveling.

Invented by Elias Howe in 1846, the single lockstitch machine was the first successful sewing machine design, predating the more familiar Singer model. It operates on a principle that involves two threads - one from the needle and another from the bobbin - interlocking to create a secure stitch. The needle thread passes through the fabric, forming a loop, which the bobbin thread then catches, creating the characteristic 'lock' in the stitch. This process not only speeds up sewing but also ensures durability and strength in the final product.

- Tension Settings Pay special attention to the thread tension to ensure it is balanced. Imbalanced tension can result in puckering or excess thread on the fabric surface.

For hydroxypropyl cellulose (E 463), the identified NOAEL corresponded to the highest dose 6,000 mg hydroxypropyl cellulose/kg bw per day (by gavage). The most relevant feeding studies with HPMC (E 464) were performed in rats which tolerated up to 10%, corresponding to 9,000 mg test item/kg bw per day. Rabbits tolerated up to 7,500 mg HPMC/kg bw per day administered via the diet (30 day exposure) and dogs up to 1,500 mg HPMC/kg bw per day, in either case being the highest tested dosages. More studies were conducted using sodium carboxy methylcellulose (E 466). The most relevant ones were conducted in rats, with NOAEL values ranging from 4,500 to 9,000 mg test item/kg bw per day (in all cases the highest dose tested). In these studies, some effects (caecum and colonic enlargement, urothelial hyperplasia, nephrocalcinosis, diffuse epithelial hyperplasia in the urinary bladder) were observed, however, not considered of toxicological concern: the findings in the gastrointestinal tract were considered to be a consequence of the accumulation of poorly absorbed water-soluble material and the findings in kidneys and urinary bladder were attributed to the up to fourfold higher concentration of sodium in the test diet compared with the basal diet. In one further study, rats were daily exposed (gavage) to doses equivalent to 0, 500, 2,500 or 5,000 mg/kg bw per day. Animals treated with ≥ 2,500 mg/kg bw per day had soft and pale faeces, which was attributed to the presence of test material and not considered of toxicological relevance. In the absence of any other adverse effects, also for this study, the identified NOAEL was the top dose (5,000 mg/kg bw per day).

Appearance: White or similar white powder.