Question 1

The bag seals are weak or inconsistent — some bags split open easily. How do I fix this?

Accepted Answer

This is the most common quality issue in non-woven bag production. Three root causes cover 90% of cases: (1) Ultrasonic horn contamination — fabric residue buildup on the horn surf…

Question 2

What do I need for installation? Can I set it up myself or do I need an engineer?

Accepted Answer

Most installations are completed by the buyer's team with Zhengxin's remote video support — our engineers guide you through each step in real time via WhatsApp/WeChat video call. Y…

Question 3

What should I know before buying a non woven bag making machine?

Accepted Answer

Before ordering a non-woven bag making machine, confirm: your local voltage (220V/380V/415V, 50Hz/60Hz, must be 3-phase), required daily output (determines machine tier), bag style…

Question 4

What auxiliary equipment do I need besides the main bag making machine?

Accepted Answer

Beyond the main bag making machine and printing unit, a professional setup requires 4 categories of auxiliary equipment:

(1) Fabric Slitting — ZXC-A1700: Cuts wide master rolls (1…

Question 5

What printing solution should I add to my bag machine? Flexo or digital?

Accepted Answer

Flexographic (flexo) printing is the correct choice for 95% of non-woven bag production. Digital printing is only justified for ultra-short runs (under 500 bags per design) with ph…

Question 6

I need maximum production capacity — 100,000+ bags per day, running 24/7. Which machine?

Accepted Answer

For 100,000+ bags/day running 24/7, the ZXL-E800 is the recommended high-speed platform. It produces D-cut, W-cut, Drawstring, Roop Handle and Box bags with inline handle attachmen…

Question 7

I'm starting a bag making business with a limited budget. Which machine do you recommend?

Accepted Answer

For a startup with budget constraints, the ZXL-A700 is the clear recommendation. It's a fully automatic machine producing D-cut, W-cut, and Drawstring bags at 80-100 pcs/min — the …

Question 8

What is PLC and HMI? How do they control the bag making machine?

Accepted Answer

PLC (Programmable Logic Controller) is the brain of the bag making machine — a rugged industrial computer that executes the control program: reading sensor inputs, making logic dec…

Question 9

What is a servo motor? Why is it important for bag making machines?

Accepted Answer

A servo motor is a precision electric motor with a built-in position sensor (encoder) that reports its exact rotational angle back to a controller thousands of times per second. Th…

Question 10

What is ultrasonic welding? How does it seal non-woven bags?

Accepted Answer

Ultrasonic welding is a bonding method that uses high-frequency sound vibrations (20,000 cycles per second — above human hearing, hence "ultrasonic") to fuse non-woven fabric layer…

Question 11

What is PP spunbond non-woven fabric? How is it different from woven fabric?

Accepted Answer

PP spunbond non-woven fabric is a sheet material made directly from polypropylene polymer — not woven from yarns like traditional textiles. The manufacturing process: polypropylene…

Question 12

What is GSM in non-woven fabric? What GSM should I choose for shopping bags?

Accepted Answer

GSM stands for Grams per Square Meter — it measures the weight and thickness of non-woven fabric. For shopping bags: 60-70 GSM is standard for lightweight retail bags (good print s…

Question 13

Why are non-woven bags considered eco-friendly? Aren't they still made of plastic (polypropylene)?

Accepted Answer

This is the most common question from end-users, and the answer is nuanced. Yes — non-woven bags are made from polypropylene (PP), the same base polymer as many plastic bags. The e…

Question 14

What is the "no-waste-edge" technology? How does it save fabric material?

Accepted Answer

Traditional non-woven bag making machines produce bags from a continuous fabric roll that is wider than the finished bag. The excess width on both edges — typically 3-8 mm per side…

Question 15

How does the machine know where to cut when the fabric has printed logos? How does registration tracking work?

Accepted Answer

Registration tracking is an automatic positioning system that ensures the cutting blade and sealing die always align with pre-printed logos, even if the fabric stretches or the pri…

Question 16

Why do high-end bag machines use servo motors instead of regular motors? What's the actual benefit?

Accepted Answer

A servo motor is fundamentally different from a traditional clutch motor — it's the difference between driving a car with cruise control (servo) versus driving with only an on/off …

Question 17

How does ultrasonic welding work on non-woven fabric? Why is it better than heat sealing?

Accepted Answer

Ultrasonic welding bonds non-woven fabric by converting high-frequency electrical energy (20 kHz) into mechanical vibration. A piezoelectric transducer inside the ultrasonic genera…

Question 18

What daily and weekly maintenance does the bag making machine need?

Accepted Answer

Regular preventive maintenance is the single most effective way to avoid unplanned downtime. A machine that runs 8-16 hours daily needs consistent care — here is the complete sched…

Question 19

How do I calibrate the photocell tracking so the printed logo aligns correctly on the bag?

Accepted Answer

Photocell tracking ensures the machine cuts and punches in the correct position relative to pre-printed logos on the fabric. Misalignment causes logos to appear off-center, cut off…

Question 20

How do I adjust the ultrasonic welding settings for different fabric thicknesses?

Accepted Answer

Ultrasonic welding quality depends on three parameters working together: amplitude, pressure, and speed. Getting the balance right is critical — wrong settings cause weak seals (ba…

Question 21

What is the daily startup and shutdown procedure for the bag making machine?

Accepted Answer

Daily startup (5-10 minutes, before production begins): (1) Visual walk-around inspection — check for loose bolts, worn belts, oil/fabric debris buildup, and any signs of overnight…

Question 22

How do I switch the machine from one bag size to another? How long does it take?

Accepted Answer

Changing bag size or style involves adjusting 4 mechanical settings and updating the PLC parameters. Total time: 15-30 minutes depending on operator experience.

Step 1 — Mechanica…

Question 23

How do I install and set up a new non-woven bag making machine after delivery?

Accepted Answer

Machine installation follows a 5-step sequence. Step 1 — Unpack the crate carefully: remove steel banding, unscrew the plywood panels, and inspect for any shipping damage before li…

Question 24

What if the machine gets damaged during shipping? Who is responsible?

Accepted Answer

Shipping damage is rare with proper packaging but devastating when it happens. Zhengxin's standard packaging: machines are bolted to a fumigation-free wooden pallet base, wrapped i…

Question 25

What voltage does the machine use? Can it work with my country's power supply?

Accepted Answer

This is a critical risk that can destroy your machine if not handled correctly. Zhengxin machines can be configured for your local voltage and frequency — this must be specified wh…

Question 26

What if the machine breaks down and I can't fix it? Do you provide after-sales support?

Accepted Answer

After-sales is the #1 concern for overseas buyers, and it's a legitimate risk with many small Chinese suppliers who disappear after shipment. Zhengxin's after-sales system: (1) Rem…

Question 27

How long does delivery actually take? What if the supplier delays shipment?

Accepted Answer

Standard lead time for Zhengxin machines is 25-35 working days for standard models, 35-45 days for customized configurations. Sea freight adds 15-45 days depending on destination (…

Question 28

What happens if my bag machine gets stuck at customs? How do I prevent it?

Accepted Answer

Customs rejection is one of the most expensive risks — your machine sits at port accumulating daily demurrage charges ($100-500/day depending on country) while you scramble to fix …

Question 29

How do I avoid buying a low-quality non woven bag making machine from China?

Accepted Answer

The biggest risk in importing machinery from China is receiving a machine that doesn't match the specification or fails within weeks. Red flags: supplier refuses factory visit or v…

Question 30

I need to produce shopping bags for supermarket chains. What machine configuration do you recommend?

Accepted Answer

For supermarket chain supply, you need speed + consistency + printing capability. Recommended configuration: ZXL-A700Ultra (fully automatic, 100-120 pcs/min, ultrasonic sealing) pa…

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Preguntas y respuestas

I need to produce shopping bags for supermarket chains. What machine configuration do you recommend?

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