ASO Co., Ltd.

Clean Poly Bag is a clean plastic bag with no visible foreign matter on the inner or outer surfaces. It has been certified to comply with the Japanese Pharmacopoeia and other standards. It is cost effective, and can be widely used as an inner packaging bag for various applications, including the pharmaceutical applications.
Additive-free low density polyethylene (LDPE) is used as the raw material. You could prevent particle formation in the product( bleed-out of additives ) because of using Radical polymerization LDPE. 

※Some of the above test contents are excerpted and tested.

The most common complaints about plastic bag products are defects such as "cuts" and "separation" in the sealed portions due to insufficient heat-seal strength. Our production equipment employs a unique "cut-and-seal method" that provides improved seal strength and stability compared to the conventional heat-seal method.

[Test conditions]
1. Bag size: 0.1mm×550mm×770mm 2. Raw material: Additive-free LDPE 3. The seal strength was measured in three sealed portions of three specimens.
* The above figures are measured, not guaranteed, values.

Common materials for the manufacturing of plastic bags include "low density polyethylene (LDPE)" and "linear low density polyethylene (LLDPE)".

LDPE is a very pure polymer immediately after polymerization. The formation of additive particles is inevitable for LLDPE, which is produced by ion polymerization. However, in order to improve film productivity and efficacy of the bag manufacturing processes, an "antioxidant (BHT)," fatty acid-based "lubricant," silica-based "anti-blocking agent," and other additives are added in quantities of several hundred to several thousand ppm.

Therefore, after the inflation and bag manufacturing processes agglomerated powder starts to form on the inner and outer surfaces of the bag due to the bleed-out of these additives from inside the film. As these surfaces will come in contact with the packaged products, the biggest challenge in standard polyethylene is to prevent additive particles forming as they inevitably contaminate the products at the time of filling or packaging.

These particles continue to bleed out from the plastic film over time. For example, you may have seen white powder adhering to the surface of plastic bags stored for as long as a year. This is due to the bleed-out of these particles.

The following tables compare the numbers of particles measured on a standard plastic bag and our Clean Poly Bag. Relatively new plastic bags produced about one week before testing were selected.

Standard L-LDPE bag

(0.1mm×500mm×850mm)

Clean Poly Bag

(0.1mm×500mm×720mm)

※The above figures are measured, not guaranteed, values.

This product is produced in an ISO class 6 (class 1000) cleanroom.
In the production environment, bacteria inspections (falling and airborne) are conducted periodically. The products are also periodically inspected for microorganisms. Our workers wear clothing that completely covers the skin. Thus, we take all possible measures to ensure that the bags are suitable for use as packaging for pharmaceuticals or semiconductor devices.

Microorganism inspection

(1)Falling bacteria inspection (Koch method)

(2)Airborne bacteria inspection (80 in 320 L)(Number of colonies/L)

(3)Product inspection; washout method (2000cm³)

Packaging is an important factor in maintaining the cleanliness of clean plastic bags. As the inner packaging bag of clean bags, which comes in contact with them, we use a clean bag of the same material to keep them clean. We can also deliver our clean bags in double or triple inner packaging so that they can be unpackaged in order in an anteroom.

As the outmost package, "UV Cut Clean Cloth Sheet" is used. With its excellent shock resistance, "UV Cut Clean Cloth Sheet" protects Clean Poly Bags in transit securely. This UV protection sheet cuts 99% of 380 nm and shorter wavelengths, which promote ultraviolet degradation, and protects plastic bags in storage from degradation by ultraviolet light from ultraviolet germicidal lamps.

The combustion catalysis effect of the sheet makes it an environmentally-friendly, hybrid packaging material that, when incinerated, inhibits the production of dioxins from other waste (of course, this product does not produce dioxins) or reduces NOX in exhaust gas.

※The above figures are measured, not guaranteed, values.