This article just tries to discuss the industrial scale production of non-woven bags, for small-scale manual production, we will introduce them in subsequent articles.
I. CHOOSE THE MACHINE FROM THE BAGS
Before discussing what machines are needed, you need to have some basic understanding from the manufacturer’s point of view for the non-woven bags you want to produce. This can also be helpful if you need to purchase non-woven bags.
In production, the most basic ones we need to consider are three aspects: Bag Type, Material, Size.
1.1 CLASSIFICATION OF BAG TYPES
Regarding the bag types of the non-woven bag, there are with different names in different countries and regions, and the classification can be based on the usage, such as shoe bags, nursery bags, garment bags, promotional bags, etc.; if discussing the models and specifications of the corresponding bag making machine, it is recommended to classify according to the appearance of the bags. The following five types of bags are the most common on the market, and thye are the first to know when purchasing a machine:
NO.1 W-CUT BAG (T-SHIRT or U-CUT, or VEST BAG)
The most popular type of polythene bags, instead of polythene, here it’s made of polypropylene non woven fabric. Simple and practical, low cost, it is the most commonly used bag type in the banned country as well.
NO.2 D-CUT BAG(or FLAT BAG)
The same very common bag type is often used as a supplement to W-cut. In the banned countries, these two types of bags are conservatively estimated to account for more than 80% of the entire market.
NO.3 DRAWSTRING BAG(SHOES BAG)
Usually used for the internal packaging of shoes, so it is also called shoes bag.
NO.4 HANDLE BAG(LOOP HANDLE BAG)
In fact, all bags with handles including the handle box bag below(NO.5) can be called handle bags. But practically we call it “Handle Bag” only when it’s not handle box bag.
NO.5 HANDLE BOX BAG
A handle bag with both bottom and side gusset, we call it Handle box bag.
|Bottom Gusset||Side Gusset|
|Handle Box bag||√||√|
In addition, there are some other types of bags: zipper bags, home textile bags, organ bags, date palm bags, etc., which are derived from the use, craftsmanship, style, or added value. For reasons of space, we are no longer expanding.
Non-woven bag making machines can handle a variety of materials, the most common of which is: spunbond non-wovens . We are only discussing the spunbond non-wovens here, such as the water-spun non-wovens, which require a custom-made bag making machine.
We usually have two standards for measuring non-woven fabrics:
The unit of measure is GSM(grams per square meter), which is how many grams per square meter. The range of fabric thickness affects the choice of machine.
thickness of fabric (from left to right: 25/45/65/85/120gsm)
The theoretically producible fabric thickness range for most machines on the market is the same 30-120 gsm, but the “comfort range” varies from different configurations. A common configuration is 300mm ultrasonic with a comfort range of 50-120gsm. On MJ machine, the 200mm ultrasonic developed by itself is used by default, which comfort range is about 30-80gsm. Only the fabric needs to use most of the time is more than 80gsm, 300mm ultrasonic is recommended. If you produce thinner fabrics most of the time, you can choose 153mm ultrasonic mould, the comfort range is about 20-50gsm.
Therefore, there are specific requirements for the thickness of the fabric. Please communicate with the supplier to confirm the configuration before purchasing the machine.
The ratio of PP granule will have a significant impact on the cost of the finished non-woven fabric, and will also affect the quality of the fabric, which in turn affects the quality of the finished bag. Poor quality bags have poor tensile strength and are more susceptible to breakage.
The measurement methods for different bag sizes are as follows:
Due to the limitation of machine feeding width and ultrasonic sealing width, MJ standard models can do as the following table::
|Bag Type||Width (mm)||Height (mm)||Gusset (mm)|
|Box bag – MJNBH Series||100-640||200-570||60-160|
|Box bag – BEYONDER||200-500||180-450||80-200|
Note: The width, height, and side widths have its own principle to match each other.
In fact, after more than 10 years of improvement, the standard models are enough to cover most of the common sizes on the market.
If you have a size requirement outside of this range, please contact us for the relevant custom model
II. CHOOSE THE BAG MAKING MACHINE
There are three main factors to consider:
2.1 BAG TYPE CORRESPONDING BAG MAKING MACHINE
For the bags you want to produce, we mainly have these corresponding schemes as your choice.
Note: Other vendors have different machine model names, but the correspondence is the same, you can also consult them to get the relevant files to decide models.
2.2 BAG TYPE CORRESPONDING MACHINE CAPACITY
And here is the corresponding capacity to those schemes.
|Scheme||Monthly Output (million pcs) |
|W-cut||D-cut||Shoes bag||Handle bag||Box bag|
 The machine can only produce one bag type at the same time. For capacity calculation and its influencing factors, check here.
 A single machine can match multiple manual punches, and 0.8 is a capacity for configuring a manual punch, If 2sets, 1.6million pcs.
 A single machine can match multiple hanlde sealing machines, and 0.3 is the capacity when configuring a single 4-point sealing, If 2sets, 0.6million pcs.
If you are new in this industry, and want to start with one set. The selection of the bag making machine can be determined with reference to these chart above.
If buying more than one set, the third factor is very important.
2.3 EXPECTED MARKET ORDER VOLUME
Reasonable solution based on the expected number of orders that can be obtained in your market.
Example: The estimated order quantity of customer “M” is as follows:
|Bag Type||W-cut||D-cut||Handle bag||Box bag|
According to the table in 2.2, we’ll find that the scheme of selecting H*1+C*2+A*2 is an economical and reasonable solution
However, if it is expected that the Handle Bag or Handle Box Bag will grow considerably in the future, you can reduce A or C as appropriate, and increase H. It not only takes into account the existing order requirements, but also reserves more room for your future development. Such as: H*3+C*2
III. OTHER AUXILIARY MACHINES
In the process of producing bags, other machines are needed to assist in the production of bag making machines:
3.1 Air compressor (required)
Necessary air source, select the corresponding power according to the number of models and machines.
Air compressors are divided into piston and screw, which are mainly reflected in the difference between the purchase cost and the use cost. The screw type is expensive, but durable and energy efficient.
Example: Customer M chooses H*1+C*2+A*2 scheme, it is recommended to choose air compressor with more than 40HP. Considering the increase of bag making machine in the future, 50HP can be considered.
3.2 Manual Bag Making Machine (Recommended)
There are two kinds of lace machines and spot welders, which are corresponding to edge welding and handle welding. Usually used in the following two situations:
The customer asks for the proofing, and if the machine is produced, it will cost a lot. This can be done using a manual machine.
Repair Defective Bag
In actual production, there will be defective products caused by production errors. If there is a manual machine that can repair the bag, it can recover losses and reduce costs.
3.3 Slitting Machine (Optional)
Fabric suppliers have a long supply and shipping cycle. In the face of changes in order specifications, or when the handle reel needs to be made by yourself, a slitting machine is required.
3.4 Stabilizer (Optional)
In some countries, the voltage supply is unstable. It is recommended to purchase a voltage regulator to protect the stable operation of the machine.
The regulator is normally depleted. A general regulator, in an environment where the voltage change is not stable, it may take a 1-2 year to replace it.
3.5 Generator (Optional)
Considering that the construction of grid facilities in individual countries is not perfect, or the power supply is insufficient, it will face more frequent power outages. In order to guarantee orderly production, temporary power supply can be provided by the generator.