stretch film,polyolefin shrink film 12 standards

stretch film,polyolefin shrink film 12 standards:

stretch film and polyolefin shrink film is made of polyethylene particles, processed by 

blowing or casting, and processed into a membrane shape of a thickness of 0.002-0.3mm. With 

the popularization of plastic packaging products, the share of stretch film and polyolefin 

shrink film in the market is more and more large, widely used in hardware machinery, 

automobile parts, logistics express, furniture and household appliances, food and medicine, 

clothing and chemical industry and other walks of life. These products have brought great 

convenience to people's life.

The performance of different varieties of stretch film and 

polyolefin shrink film is different, and the selection requires some basic functions that 

we have in accordance with the stretch film and polyolefin shrink film, mainly for the 

protection of the goods, the promotion function, the adaptability to the packaging 

machinery, and the special needs of other applications. Consider, the following 12 

sections:

1. protection function

As a packaging material, stretch film and polyolefin shrink film is 

the most important and basic function to protect products. If the plastic film does not 

have a reliable protective effect on the goods packaged, it causes the goods to be damaged 

or devalued, and then it loses the use value of the packaging material. The protection 

function of stretch film and polyolefin shrink film is multifaceted, different commodities, 

different packaging forms, for stretch film and polyolefin shrink film protection function 

requirements are not the same.

2. mechanical protection

Prevent the leakage of goods in the packaging or the damage and 

pollution of the external substances into the packaging. The performance index of the 

mechanical protection function of stretch film and polyolefin shrink film is directly 

related to the mechanical strength of stretch film and polyolefin shrink film, such as 

tensile strength, tearing strength, falling body impact strength (drop impact), and 

resistance to puncture strength and so on.

3. good welding strength

Welding strength is also a necessary condition for stretch film and 

polyolefin shrink film bag to reliably protect commodities. If the weld strength is 

insufficient, the weld will become a fatal weakness of the stretch film and polyolefin 

shrink film bag, which causes the stretch film and polyolefin shrink film bag to lose the 

protection of the commodity because of the rupture of the weld.

4. barrier performance

Barrier performance refers to the performance of stretch film and 

polyolefin shrink film to prevent oxygen, carbon dioxide, nitrogen and other gases, as well 

as substances such as aroma and water vapor. In the undefined range, it usually refers to 

the barrier of non polar gases, such as oxygen, carbon dioxide and nitrogen. The effect of 

stretch film and polyolefin shrink film is closely related to the light transmittance, fog, 

glossiness, antistatic and printability of the film itself.

5. transmittance and fog

Transmittance and haze are important indicators that determine the 

visibility and clarity of packaged goods, and the relationship between the display and the 

effect is particularly large. The transmittance and fogging are expressed as percent, the 

greater the transmittance, the better the transparency of stretch film and polyolefin 

shrink film; the greater the fog, the greater the stretch film and polyolefin shrink film, 

the greater the turbidity of the object, that is, the worse the clarity.

6. glossiness

Glossiness indicates the reflectivity of stretch film and polyolefin shrink 

film at IRCON, with the percentage expressed in the positive reflection direction relative 

to the standard surface reflected luminance.

7. antistatic property

With the rapid development of electronic industry, the integration of 

electronic circuit boards is getting higher and higher. Packaging products using antistatic 

stretch film and polyolefin shrink film can avoid static damage to integrated circuits.

8. good smoothness

Good smoothness is beneficial to the smooth movement of stretch film and 

polyolefin shrink film on the packing line when packing, to avoid the excessive resistance 

in its movement. The smoothness of stretch film and polyolefin shrink film can be described 

by its friction coefficient. The smaller the friction coefficient, the better the 

smoothness.

9. high temperature resistance

It is often necessary to consider the high and low 

temperature properties of stretch film and polyolefin shrink film, such as refrigeration, 

especially for frozen food using stretch film and polyolefin shrink film, which requires 

good low temperature resistance. Wait。

10. health performance

When packaged food or pharmaceutical products, the selected plastic 

packaging film must have good health performance, meet the requirements of the relevant 

national health standards, to ensure that stretch film and polyolefin shrink film will not 

cause pollution to the packaged goods.

11. air tightness

Good air tightness, stretch film and polyolefin shrink film can 

effectively block the exchange of gas inside and outside the packaging container, which is 

necessary for most products.

12. moistureproof

Good moisture resistance is an effective means of protecting goods. The 

moisture resistance of stretch film and polyolefin shrink film increases with the increase 

of thickness, and decreases with the decrease of temperature.