PVC Tarpaulin

PVC tarpaulin manufacturer like DuraTarps usually grade and measure material by GSM (Grams per Square Metre). This is basically a measure of the weight and thickness of the material from which the tarp is constructed. The higher the GSM number, the heavier, thicker and more robust the tarpaulin. All our tarpaulins are waterproof, rot proof, UV protected.  PVC tarpaulin manufacturer usually produce material like following 3-layer structre with coating or laminating machines:

Gernarlly speaking, there are several types of machines commonly used for the pvc tarpaulin manufacturing process according to the different material specification:

1. Calendering machine: This machine is used to make pvc film. It can stir the pvc raw material to the paste. Then use roller system to calender into different thickness pvc films. Calendared vinyl films are formed from an older process of taking a dough-like material consisting of PVC, pigments, plasticizer and stabilizer, mixing them in an extruder and then rolling it through polished heated rollers which stretches the material to the proper thickness. The film is then fused to a polyester backing. The process is completed when the material is given a gloss, matte or embossed finish.
   
2. Cold lamination machine: This machine is the first generation invented for this industry. It is still wildly used to laminate pvc films onto polyester base fabric. It’s short process, high speed and low running cost. The disadvantage is the drum temprature and pressure is limited so the product quality is for short life time material like flex banner and tarpaulin for low price market.
3. Hot laminateion machine: Hot-melt coated PVC tarpaulin machine can reach much higher temprature and pressure, The PVC film is melted under high temperature, and laminated into the polyester base fabric.  it has much more complex embossing roller and surface treatment system to can make high quality, high gsm material that can be used for tents, covers, inflatables…etc and with it’s surface treatment it can add acrylic coating to make it self cleaning. Also this machine can add extra glue to the film or base fabric to make simi-coated pvc tarpaulin for higher adhesion, the glue applied before the laminating process is to improve the technical data and life-span of the product.     
4. Knife coating machine is not like lamination machine that need calendering machine supply pvc film in big rolls. The PVC raw material is 100% melted into liquid, the base fabric go through the PVC liquid and then go through the gap between 2 doctor blades, to remove the extra PVC raw material. This machine directly coat pvc resin on to the base fabric with a doctor blade. Then the material go through embossing roller to heatcase for drying. Knife coating machine is a kind of luxury option for vinyls, the coating quality have led to significant increases in lifespan over 10 years. And it can make heavy-duty material over 1500gsm for membrane structure or tents. PVC coated vinyl  has excellent tensile strength. This fabric is useful for both permanent and temporary projects. The PVC coated vinyl can be used for things like luggage, bags, cases, and protective coverings. PVC coated vinyl roll widths from 1.0mts -5.1mts, weight From 240gsm -2700gsm, thickness from 0.19mm -2.0mm.

Structures:

Diagram	Structure	Feature	Application
	2-LAYERS 1. PVC Film 2. Base Fabric	Exposed base fabric on backside	Bags, Gymmat
	3-LAYERS 1. PVC Film 2. Base Fabric 3. PVC Film	Most widly used	Banner, Tarps
	4-LAYERS 1. PVC Film 2. Black Layer 3. Base Fabric 4. PVC Film	Blockout light	Banner, Tent

The physical specification is what we used to judge the performance of the fabric in the beginning, three type datas are necessary and required . Breaking strength/tensile strength, tearing strength, adhesion strength. The following sheet is our technical data for the most widly used base fabrics:

Popular types and specs:

We can adjust thickness and structure of pvc film to control weight, by changing formulation to enable FR, anti-static, air tight, chemical resistant…etc. PVC film hardness can also cause different hand feeling. When producing we can use different technology (for example: cold lamination, hot lamination, knife coating) for different application of material. Different embossing roller can make the material surface glossy, matte or embossed pattern. This is how we customize industrail fabrics according to request. So as an OEM manufacturer, Duletai new material has a large selection of materials in different styles and specifications to chose from or 100% custom built according to customer：

Following is our pvc tarpaulins categories for different technology and applications, click image to view product list for each type: