Newlong NP-3II Portable Bag Closer

Double-thread, chain-stitch portable designed for geotextiles.

Stitch Length: 8.5 mm (fixed) / 3 stitches per inch
Speed: 1,350 ± 150 r.p.m (~5-8 seconds/bag)
Needle: DNx1 #25
Stitch type: Double Thread Chainstitch
Bag Material: Kraft Paper, Cotton, Hessian, Jute, PP/PE woven cloth and more
Cutter: Automatic Thread Cutter
Oiling System: Oil pump lubrication. Uses Tellus #32 oil. You can also use mineral oil #22-32 cSt at 40°C, readily available at your local store.

Few things are more frustrating than discovering bags splitting open, loose seams, or product loss due to failed closures—especially when dealing with heavy, abrasive, or thick materials in agriculture, chemicals, construction, and industrial packaging. The Newlong NP-3II Portable Bag Closer addresses these common challenges as a durable industrial sewing machine engineered for high-strength double-thread chain-stitch closures. Using a single needle and looper, it produces a two-thread chain stitch that creates tighter, more robust seams than single-thread models, making it well-suited for heavy bags or products subject to rough handling during transport.

STRONGER BAG SEAMS START HERE

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FAQ

Find answers to the most commonly asked questions about the Newlong NP-3II.

What are the recommended maintenance intervals and typical service requirements for the NP-3II?

Routine maintenance includes:

Regular cleaning to remove dust and debris on throat plate, feed dog grooves, and around looper each day.
Use an oil cloth to wipe down easy-to-rust areas.
Check for, and tighten, loose screws, if any, at least once a month.
Inspecting and replacing needles, loopers, and other wearable parts as needed

Proper maintenance ensures long service life and consistent performance.

What support is available after purchase?

What is the importance of the stronger seam provided by the double-thread chainstitch?

What is the difference between the Newlong NP-7A, NP-3II and NP-8?

The table below highlights the features of each machine to help you choose the right machine for your needs.

Feature / Model	NP‑7A	NP‑3II	NP‑8
Stitch Type	Single-thread chain stitch	Double-thread chain stitch	Double-thread chain stitch
Primary Strength	Speed and versatility	Maximum seam strength and durability	Strong seams with higher operational speed
Typical Operating Speed	1,700–1,900 rpm	1,350 ± 150 rpm	1,500–1,600 ± 100 rpm
Oiling / Maintenance	Automatic oiling	Manual oiling	Automatic oiling
Ideal Bag Materials	Paper, woven PP, cotton, jute, burlap	Heavy geotextiles, woven PP, multi-wall kraft paper, jute	Heavy jute, Hessian, woven PP, industrial bags
Common Applications	General industrial, agriculture, feed, spices, fertilizer, construction	Heavy agricultural products, geomembranes, industrial bulk bags	Industrial materials requiring both speed and seam strength
Best For	Fast, versatile bag closing	Durability and seam integrity on heavy/thick bags	Balanced performance: strength + faster throughput

Newlong NP-3II Portable Bag Closer

STRONGER BAG SEAMS START HERE

FAQ

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