Company Profile Bags Gallery Compostable Bag PVA Water Soluble Bag & Flushable Film Contact Us
add to favorites
Company Profile
Factories Glance
Product Scope
Company News

Checking Polybags for Quality

From: KatCheung Bags
      Read: 8276     Last Updated: 2011-6-3

A. Ways to Check Polybags for Quality through physical inspection:

1. Hold bags up to direct sunlight and check for areas of non-conformity in texture and color, other areas of weakness.

2. Seam Quality – Fill bags with sand and drop onto a hard floor from 0.5, 1.0 and 2.0 meters.

3. Seam Quality – Cut the bag open at all but one of the seams, pull on the sides of the “opened” bag to determine the seam quality.

4. Fill with water/sand and hang for a prolonged period of time.

5. Take just one face of the bag, and rub/pull on the plastic to determine overall strength.

B. Polybag Lab Testing:

1. Analytic testing to determine if the material used matches the approved material composition.

2. CONEG testing to ensure bag complies with CONEG heavy metal requirements.

Other Security Issues to Consider with Polybags:


- Warning on the polybag

Depending on the product and the export market, it can be a must. This printed warning prevents children for playing with such polybag.

- Holes in the polybag

It is also convenient to have holes, 2 or 4 depending on the size of the polybag, in order to avoid suffocation if kids paly with the bag.

- Dessicant inside the polybag

A small pack of dessicant inside prevents humidity inside the polybag. The proper warning DO NOT EAT in several langages must be printed on it.


In examining and communicating about polybags, it is important that you know the product. You can check out the details on our website c





PE BAG Transparent,
Soft hand feel,
Easy to hot seal,
Acid & alkali resistant,
Low temperature resistant
Packing foods, beverage,
hardware, instruments & meters,
maternity & children hygienic articles
PP BAG Highly transparent,
Stiff hand feel,
Light weight,
Packing foods, garments, arts & crafts, gifts
PVC BAG Transparent,
Soft hand feel,
Light weight
Packing garment, toys, bedding articles, stationery
Moisture-proof, Dioptric,
Preserve the quality & freshness of packed products to boost the sale
Packing sweets, cakes, dehydrated vegetables, dyed & fresh fruits, aquatic products, meet products, seeds, liquid


- Piece of adhesive tape

The simplest way, a piece of tape joins the 2 edges of the polybag to close it. It may damage the polybag when removing though.

- Self Adhesive closed

The edge of the polybag includes a band of adhesive tape, the polybag can be easily opened and closed, several times if needed. It is usually used with small items.

- Heat seal

Both edges of the polybag are pressed and heated in a machine in order to get them melt. It is a one time use only, once opened it cannot close again.

- Shrink wrap

The p[package or product is inserted in a machine that envelops it with a polybag, then the machine heat the polybag to perfectly fit to the product or package, like a new skin.

- Zipper

2 small parts on top of the polybag fit into each other to hermeticly seal the polybag. Frequently used in the kitchen to prevent air from coming inside the polybag to fridge or freeze food.

- Zip Fly

For big items like mattresses or blankets, the polybag may have a zip fly.

KatCheung is a professional packaging-bags manufacturer in China, we manufacture and offer high quality Plastic / Nonwoven / Paper / PVA / PVOH / Canvas bags and bag accessories around the globe. We also focus on bio-degradable eco-friendly packing materials and water soluble and fully bio-degradable products. KatCheung is sincerely looking forward to cooperating with you in development of a green world.

KatCheung Bags Manufacturing Co., Ltd. 
Tel: +86-769-82132658 (DongGuan) +86-755-28753833 (Shenzhen)

>> Back <<

  Shenzhen Jinhaoyuan Plastic Products Co., Ltd.
  Shenzhen Anhesheng Plastic Products Co., Ltd.
  Tel/Whatsapp: +86-15697692434  Email: (+more)
About us  |  Terms of use  |  Careers  |  Contact us  |  Polybag Catalog  
Copyright © 2004~2024 All rights reserved   
*A KatCheung (Group) Member    
TAG: Plastic Bag Manufacturer,Polybag,Plastic Bag,Garbage Bag,Shopping Bag,Custom Plastic Bags,self-adhesive bag,Polypropylene Bags,PVC bag,Drawstring Bag,Water Soluble Bags,Biodegradable Bags,mailing Bags,Degradable Plastic Bags,Ziplock Bags,Carrier Bag, OPP compostable bags,China Polybags
- Certified by ISO/BPI/EN13432/OK COMPOST/ASTM D6400/ASTM D6868/ABA AS4736/AS5810/D2W/EPI/TDP/BDP -