Are pp woven bags waterproof? As far as the woven bag itself is concerned, because the woven bag is made of warp and weft tapes, there is only overlap between the tapes, which does not have sealing property. Therefore, the liquid will be left through the gap between the tapes, so the woven bag itself is not waterproof.
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However, due to the special requirements of chemical industry, cement, chemical fertilizer, sugar and other industries for packaging, a considerable number of plastic woven bags must have the function of waterproof and sealing. At present, there are mainly two types of waterproof and sealed woven bags produced and applied in the market: one is the ordinary separate combined packaging bag with outer woven bag and inside liner inserted or stitched bag. The other is the composite woven bag coated with a layer of plastic film on the PP woven cloth, which will include two types also, either polypropylene coated woven bag or pp woven laminated bag.
The production equipment and process of the first kind of separated inner lining membrane woven bag are relatively simple, the equipment investment is low, and the application is very wide. The inner and outer bags are separated. The inner bag is blown film bag, which can be divided into LDPE and HDPE. The outer bag is ordinary PP woven bag, and the length and width of the inner bag are slightly larger than the outer bag. When loading materials, the inner and outer bags are uneven and easy to be damaged. In the early years, the inner and outer bags of the inner lining membrane bag and the outer bag need to be set together manually, and the inner and outer bags at the mouth of the bag need to be aligned and sewed, so the production efficiency is low, the waste of manpower is large, and the continuous and efficient production cannot be carried out. A skilled operator can only complete about bags by hand every day, and only about 300 bags can be sewn by hinge sewing machine every day. Nowadays, with the improvement of all-in-one machine, there are many machinery manufacturers in China that can produce all-in-one machines for bag cutting, sewing and lining. The technology has been widely used and tends to be mature, greatly improving the production efficiency.
Another kind of Coated plastic woven bag production must go through the coating process, using the extrusion coating machine to coat a layer of plastic film with a thickness of about 0.02 ~ 0.04mm on the outside of the woven pp cloth. Or at the same time, to use the coating material as the bonding medium, and then composite a layer of BOPP film on the surface, can achieve better waterproof effect, it was named BOPP
pp woven laminated bag. When doing coating, the temperature of the extruded film is about 300 &#;, and the newly extruded film is combined with the braid by a pair of cooling rollers. However, such high temperature reduces the strength of the cloth surface, reduces the elasticity, increases the brittleness of the bag surface, and makes the bag easier to be damaged in the falling tests.
Updated: 3-8-
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Are Bulk Bags Watertight or Waterproof?
Key Questions to Consider When Choosing Eco-Friendly Packaging SolutionsThere is a lot of bad information out on the web about flexible intermediate bulk containers being watertight/waterproof and we want to set the record straight. Flexible intermediate bulk containers are not waterproof or watertight. FIBCs are made from woven polypropylene and the woven fabric itself is not watertight or waterproof.
Some bags are coated with a polypropylene laminate which can be on the inside of the bag, the outside of the bag, or both. This polypropylene laminate does not make the FIBC waterproof or watertight which is a common misconception. Polypropylene lamination can act as an adequate moisture barrier and can significantly reduce fine material leakage but again, does not make an FIBC waterproof or watertight. Click here to learn more about coated and uncoated bags.
Can You Make Bulk Bags Watertight?
There are a few different types of FIBC bulk bag closures that can help keep your bag watertight. The most common type is the drawstring top. This type of closure uses a piece of rope or string to tighten the top of the bag and keep it closed. Drawstring tops are very effective at keeping liquids out, but they can be difficult to open and close.
Other types of top closures include the flap top, which is a piece of fabric that covers the opening of the bag and is held in place with snaps or buttons, and the valve top, which uses a rubber or plastic valve to keep the contents inside the bag.
The most common type of bottom closure is the spout, which is a hole in the bottom of the bag that allows you to discharge the contents out. Other types of bottom closures include the gusseted bottom, which is a piece of fabric that forms a triangle or diamond shape and helps keep the bag upright, and the tie closure, which uses a piece of cloth or string to close the bottom of the bag.
No matter which type of FIBC bulk bag you are using, it is important to make sure that it is properly closed. This will help keep the contents inside and prevent them from leaking.
Can You Make Bulk Bags Waterproof?
Although bulk bags are not watertight or waterproof, there are many ways to protect your products from leaking. You can use a polyethylene liner to add another layer of protection. A poly liner is a thin piece of plastic that fits into the bulk bag and lines the inside of the bag. These can be a separate liner that you place into the bulk bag or a custom bulk bag pre-lined with one. It helps prevent moisture from getting into the bag. However, it doesn't make the bag completely waterproof.
Form-fit liners, also known as "liquid liners" are a type of liner that fits inside a container perfectly. They are made out of polyethylene and are cube-shaped to properly fit the container (these do come in different sizes). They are perfect for transporting liquids. However, these liners won't make your bag completely waterproof or watertight.
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