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AD*STAR® block bottom woven bags are made by extruding polypropylene resin into sheets, cutting the sheets into tapes, and weaving the tapes into the tubular fabric. The tubular fabric is then laminated, cut, and converted into a finished bag. The following information demonstrates the basic steps in manufacturing a poly woven block bottom bag.

Starlinger Company supplies integrated bag converting machinery to produce the woven valve bag from start to finish. Production steps include:

Tape Extrusion: High-strength tapes are produced by stretching after the resin extruding process.

Weaving: Tapes are weaved into tear-proof flat fabric in circular looms.

Coating: A thin layer of PP film is laminated to the woven fabric. Or additional BOPP film applied which can offer more eye-catching print and marketing effect.

Printing: Both flexo print and gravure print up to 8 colors, can be printed on the bag fabric.

Slitting: Top, bottom, and valve patches are pre-cut for the converting line.

Converting: Using Starlinger machines, sacks are assembled by forming the block bottom and applying patches and the valve using hot air sealing technology. No glue is used to seal the bag.

Baling: Bags are palletized and baled. Normally 8,000 bags can be baled in a single pallet.

AD*STAR® Bag Specifications and Sizes

Specifications

Type: Block Bottom Valve
Material: Coated PP Woven fabric
Construction: Single Ply: Woven Poly
Two-Ply: Woven Poly + BOPP

Two-Ply: Woven Poly + Kraft Paper

Tape Width: 2.5mm – 5mm
Fabric Weight 50 – 80 gsm
Coating Weight: 17 – 25 gsm
Valve Material: Woven PP, PE Film, Non-Woven Spunbond
Perforation: Adjustable Levels of Perforation
Valve Type: Standard Internal, Tuck-in, and Ultrasonic Seal
Bag Size Min. & Max.

Width: 11.81 – 23.625 Inches
Length: 17.72 – 35.83 Inches
Bottom Width: 3.15 – 7.00 Inches

Need Customized Woven Poly Valve Bags Now?

If you have any need of these PP woven packages , welcome To contact me any time via the following ways :

Sales Manager:Daniel

Mobile Phone:+86- 13802155833

E-mail:tjwhoking@163.com

QQ:490045876

SKYPE:antonio87455

WeChat:+86-13802155833

WhatsApp:+ 86-13802155833

 Detailed Information and Advantages:

1. Professional manufacturer and direct exporter,we are
2. Lower cost and faster production line, higher extensibility and more environmental production 
3. No leakage, no stitched, no holes
4. AD*STARKON production lines imported from Austria 
5. Production capacity may get 1.5 million per week, we have four sets of completed starlinger production lines 
6. Technology : advanced in the world -----hot air welding technology 

Block bottom bags are used to transport and store a wide variety of dry flowable bulk materials.

There are two basic types: Open Mouth Block Bottom Bags and Valve Block Bottom Bags. An open mouth bag is a tube of laminated PP woven fabric with the bottom end sealed. The bag is filled through the open mouth and then closed by stitching or tape.
Valve bags are packed on equipment that deposits material into the bag via a horizontal filling spout. After filling, forces generated by the product inside the bag allow the valve to open to self-seal.

PP woven block bottom bags are made up of 2-3 layers (plies) of fabric and film. Or can be combined with kraft paper.

·        Production process of 25kg 50kg kraft paper plastic pp woven composite porland cement bags/sack:

·        The following is the whole process to making the Ad*Starkon block bottom valve sack:

·        Extruding PP particle---------Drawing and cutting PP film-------thread the PP tapes-------Weaving pp tapes to tubular fabric-------Coated with PE film- offset or flexo Printing the body-------hot air welding the tubular body and bottom and top patches  and valve--------Inspecting the strength tensile and air permeability-package

·        Advantage of 25kg 50kg kraft paper plastic pp woven composite porland cement bags/sack:

·        Compared with the traditional 3-ply multi-wall paper cement bag and ordinary pp woven plastic bag, the Ad*Starkon  block bottom valve sacks have the following advantages:

·        1. Economical- lower sack weight save raw material as against the paper bag and PE bags.

·        2. Cleaner environment - There is no glue adhesive during the whole production process.

·        3. Less risk of damage - high strength tensile pp woven  and high speed filling.

·        4. Easy handling-the brick shape box shape is easy to palletizing.

·        Quality control of 25kg 50kg kraft paper plastic pp woven composite porland cement bags/sack:

·        In order to produce the high quality Ad*Starkon block bottom valve bags, the following is our effort to control quality:

·        1. From material: using 100% original high strength pp material. not recycled or wasted pp material.

·        2. For fabric: control the strength tensile and density of pp tapes to satisfy the loading capacity.

·        3. Inspection: using the machines to test the strength tensile and tearing function after finish the goods.

·        4.Drop test:  for safe factor, for each batch of products, will test the air permeability.

• Packaging & Shipping

• Packaging:

• Bale packing: 500,1000pcs/bale or      customized. Free of charge.
       Wooden Pallet packing: 5000pcs per pallet.
       Export carton packing: 5000pcs per carton.
       Loading:
       1. For 20ft container, will load about:10-12tons. 
       2. For a 40HQ container, will load about 22-24tons. 

FAQ

Q1. Are you trading company or manufacturer?

A: Yes, we a factory with self-own plant for pp valve bags producing over 20 years.

Q2. What is your best price for this product?

A:The price is negotiable. It can change according to your quantity When you are making an inquiry, please let us know the quantity you want.

Q3. What is the MOQ for your product?

A: Normally our MOQ for each product is 10000pcs.

Q4. Why choose us?

A: Professional and experienced R&D team,reliable and strict quality control system. We test all our products before shipment to make sure everything in perfect condition.

Q5. What's the information should I let you know if I want to get a full quotation?

A: The price is depend on the material, size, weight, printing, quantity etc. When you are making an inquiry, please let us know your specific requestments.Welcome Your Inquiry.

Q6. How long will the shipment be delivered ?

A: Usually about 10-20days.We have good cooperation in the whole manufacturing procedures, which could promise you the punctual delivery.

Q7. How do you ship the products?

A: Shipping Methods: By air or by sea(FOB port:Ningbo Shanghai，Qingdao,etc.),by express (DHL,UPS,TNT,FEDEX).

If you have any need of these PP woven packages , welcome To contact me any time via the following ways :

If you have any need of these PP woven packages , welcome To contact me any time via the following ways :

Sales Manager:Daniel

Mobile Phone:+86- 13802155833

E-mail:tjwhoking@163.com

QQ:490045876

SKYPE:antonio87455

WeChat:+86-13802155833

WhatsApp:+ 86-13802155833