Shree Tirupati Polypack
Manufacturer of PP/HDPE Woven Products
"Success Has A Simple Formula; Do Your Best And People May Like It." Sam Ewing
  STP believes that need and emergency can rise anytime, moreover to give an ease to purchase process, we update our stock positions daily, so that electronic capabilities help you to increase order accuracy, save time, and manage your purchasing activities efficiently through JIT delivery.

STP’s website and systems integration efforts provide you with tools to effectively manage your day-to-day needs, as well as your overall procurement requirements. Mostly of our clients use it for ordering and payment purposes.

It consist of 24/7 availability to images of your items, its available stock with STP, your packaging specifications and any orders placed with us. You can place new orders, view orders in progress — all in real time, any time.

Increasing scales, globalization, control of costs, JIT delivery, changing laws and regulations ,quality demands were to name a few, of the challenges that STP has faced. The aim of STP as a developer, supplier and adviser is to offer the best possible solutions for industrial packaging needs. STP now-a-days offer three primary services to its customers; Commercial, Technical & Quality as elaborated below;
At STP, Woven Sacks are generally designed according to the specifications provided by our clientele.

Generally the standard varies upon needs for their specific use and requirements. This process comprises of making tapes according to strength needs, their weaving in fabric form, coating needs such as UV stabilization/lamination/liner/printing/stitching/bailing needs of the end products as desired.

Standards of color combinations and designs are taken care of while manufacturing, to exactly express the customer’s message, meet consistency amongst batches, material characteristics, quality and quantity details, handling instructions etc… Our designing experts suggests / take care of the demands expressed for lamination whom are into manufacturing / dealing of hydroscopic Materials viz. Chemicals, Fertilizers, Food Products to name a few.. Broadly this entire process passes out from following 6 ~ 7 processes.
The process of manufacturing tape yarns starts out from granules (virgin PP or HDPE raw material, with feeler of CaCo3 and pigment and other additives) feeding to Tape Plant, through a feeder tray adjacent to the feed hopper, which acquires material through vacuum suction inside the hopper. After fetching to the extruder of the Tape Plant, it melts by applying controlled heating through barrel. The melted mass is forced out through a die head into cooling tank in form of film of required denier.

After the cooling effect the congealed film made out of these HDPE (High Density Polyethylene) / PP (Polypropylene) granules is converted into 2.5 mm. wide tapes, slit into tape yarn by the slitting unit, stretched and annealed, passing it through the blades to obtain tapes. Passing through stretching and annealing process, it’s ready to wound on cheese winders.

Take-up winder winds the heat oriented tape yarn onto bobbins in Cheese Winder.
Weaving of tape yarns is similar to the weaving of fabrics, done by flat / circular looms which latter offers, higher output in the form of fabric and better retention of mechanical properties. Tapes from the bobbin in the circular loom’s creel stand are woven into flat/circular form, which produce fabric of desired width. Circular weaving is then cut if required into required dimensions.

The process of Weaving is Automatic and Continuous in nature. The fabric produced by each Loom is continuously wound on Rotating Pipes.
Woven fabric is coated (according to requirements) with polymer (LDPE/LLDPE/PP) through extrusion coating process. If reversible coating is required the roll is being cut in required sizes and reversed as desired for further forwarding it to stitching / printing department.
The laminated / un-laminated rolls are then forwarded to printing department for necessary printing as per customer’s desired specifications, which further leads to finishing and stitching department after visual inspection.
  Manufacturing of Liner
The granules of LLDPE/LDPE/HM are fed into the extruder hopper, where they are plasticized and melt flow is passed through a Die. Film thus formed is blown into required size and are wound in cores of the rolls of film obtained are cut into required size and inserted into the Fabrics for manufacturing of Sacks.
  Finishing & Stitching
The fabric/roll is being cutinto desired sizes and stitched. For manufacturing the valve bags, a valve is made in one corner of the cut piece, prior to stitching. The Quality Control check is carried out in stitching also to avoid any mis-stitched / printed bag. The parameters pertaining to the Weight, Denier, Bursting Strength etc. are strictly adhered to customer’s specification.
The printed/unprinted sacks are compressed through hydraulic bail press and then are finally ready for dispatch.
  Process of Manufacturing
  Membership & Affiliations
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