Many buyers have a headache when they encounter the acceptance of film-coated non-woven bags. Where should the standards of film-coated non-woven bags be checked and accepted?
Because there is a certain difference between coated non-woven bags and ordinary non-woven bags. Let’s first talk about the characteristics of film-coated non-woven bags. Only after understanding the characteristics of film-coated non-woven bags can we understand this bag so that we have targeted inspections during acceptance.
Most of the film-coated non-woven bags are colored patterns or some figures such as landscapes. Since the film-coated non-woven bags need to be made before printing, the quality of the electro-engraving directly affects the printed effect. , Then how to judge the quality of the electric engraving plate?
We look at the color deviation of the printing. The color deviation is mostly due to the depth of the engraving when making the plate. For example, if a pattern is red only 20, then it is engraved into 40 so that the overall pattern is reddish. One element of the inspection of film-coated non-woven bags is the problem of color difference. However, due to the defect of the gravure printing machine, the color value on the document cannot be completely produced when the plate is made. This requires the experience of the plate-making company, so the film is not If the chromatic aberration of the woven bag can be controlled within an acceptable range, it is OK.
If there is no problem with the color, check the registration problem, if the registration is not correct, the pattern is not clear and blurry. If you have the conditions, you can see at a glance whether his set line is aligned or not during the printing process.
Another one is the tension of the film-coated non-woven bag
At present, most of the film-coated non-woven bag fabrics on the market are made of B or C grade materials, which we call film-coated materials in the industry.
As early as 5 years ago, there was no distinction between laminating materials and ordinary fabrics. In recent years, the competition in the non-woven bag industry is too fierce, so laminating materials mixed with many recycled materials have appeared. Since the outer layer of the non-woven fabric is covered with a layer of film, the gloss of the cloth itself is not visible, so under this situation, it can be saved or saved.
It is precisely because the fabric itself is mixed with a large proportion of recycled materials, and the tensile strength of the fabric is directly affected. After the fabric is coated, the flexibility of the fabric is reduced and it is very brittle when it is torn.
We only have to understand the characteristics of non-woven fabrics, so when we inspect and accept laminated non-woven bags, if we find that the load-bearing capacity of the bag is reduced, this is normal, but at this time we have to grasp a standard that is whether it can withstand you. If the weight of the contents cannot bear the weight of the bags, the bags will be scrapped.
Before placing an order, if you know that the items you are loading are heavier, then I suggest that you tell the manufacturer directly that I want to use a new material to cover the film, so that the tensile force will increase a lot.
Another issue is whether the manufacturer cut corners
The current general calculation formula on the market is to increase the weight of the original fabric by about 25 grams for the film. If it is lower than this weight, it can be considered that the material has been stolen. For example, I require 80 grams of non-woven fabric to be coated, and then it should reach 105 grams per square meter after coating.
The last one is the same as a non-woven bag without a film. Check the workmanship of the bag carefully. Is there a straight line at the mouth of the wireless head bag? Also, the edge of the bag does not break off, whether the bag is straightened after being flattened, if the skew is too large, this is a quality problem; there are also packaging problems and so on.
In short, now the competition in the non-woven bag industry is fierce, and some unscrupulous manufacturers use methods to reduce costs. As long as we keep our eyes open, these small methods will not escape our eyes.