Email:star@hzkangda.com.cn Hangzhou Kangda Bathroom Co.,Ltd

Hangzhou Kangda Bathroom Co.,Ltd

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Hangzhou Kangda Bathroom Co.,Ltd

Add:Dangshan, Guali Town, Xiaoshan District, Hangzhou City, Zhejiang Prov., China

Contact Us:STAR SHI

Tel:86-571-82533381

Mob:86-15858118466

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E-mail:star@hzkangda.com.cn

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Embossed PVC Foam Board Sorted By Processing Method

Embossed PVC Foam Board Sorted by processing method

In some reports or in the eyes of some people, the foam packaging material seems to be toxic, will cause some harm to the environment and human health, and even asked to stop using foam packaging materials, then the fact is what? Here we look at this matter from a professional point of view.

After expert research shows that the foam packaging, although there is a certain risk, but did not reach the level of carcinogenicity or toxicity, the packaging of raw materials is polystyrene, this material can be processed into a foam packaging can withstand the temperature to zero 70 degrees Celsius, in this range the properties of polystyrene is stable, there is no harm, but if the temperature exceeds 70 degrees Celsius, polystyrene will change to produce harmful substances.

If the ambient temperature below 35 degrees, is not volatile harmful substances, in many cases polystyrene molecular structure is not easy to degrade, the nature is stable, but used in disposable fast food box polystyrene is different, Polystyrene will encounter the reaction of high temperature will release toxic substances in the oil and other organic substances soaked under the lunch box will bubble or melt, so that will produce styrene, plasticizers and other substances harmful to the human body. So the use of foam packaging materials when the temperature control in 70 degrees below the basic will not hurt the human body.

How to distinguish between rigid foam and soft foam in foam packaging products

Closed-cell foam refers to the microporous interconnection between the known as open-type foam, closed each other. Foam has two types of hard and soft. According to the American Society for Testing and Materials, at a temperature of 18 to 29 ° C for a period of 5 s, a round bar around 2.5 cm in diameter, if not broken, is a soft foam and vice versa plastic. Foam can also be divided into low foaming and high foaming. Usually the expansion ratio (after the foam is larger than the volume before foaming) is less than 5 called low foaming, and greater than 5 is called high foaming.

First, the rigid foam that is at room temperature, constitute the foam of the polymer is crystalline or amorphous, their glass transition temperature is higher than room temperature, so the foam at room temperature texture hard.

Second, the soft foam that is the composition of the polymer foam melting point is less than room temperature or amorphous polymer glass transition temperature lower than room temperature, the material at room temperature soft texture.

Third, semi-rigid (or semi-soft) foam is between the above two types of foam.

In addition to the above, there are many categories for the classification of the foam. For example, according to the processing method classification, can be divided into two-step method, semi-prepolymer method, one-step method and spray method. According to the foam density can be divided into high, medium and low and ultra-low density foam and the density of great self-crust foam or called the whole skin foam. The latter is a special form of foam which does not have the same density as the previous foams except that a more normal foam is produced inside the foam and no bubbles are generated on the surface portion or little bubbles are generated, Surface density is much higher than the internal foam dense skin layer, from the skin to the center of the core there is a density gradient gradient is very obvious changes. In the polyurethane flexible foam, it is to adapt to the car steering wheel and handrails and bicycles, motorcycle saddle and the development of a semi-rigid molded foam products.

With the soft foam of raw materials, processing technology and the progress of the professional needs of the products, the gradual emergence of product-based classification, such as soft foam, high resilience soft foam, thermal molding soft foam, Cold-molded soft foam, ultra-soft foam, antistatic soft foam, lipophilic soft foam, hydrophilic soft foam, energy-absorbing soft foam, and so the new classification, these are with the market refinement, The development of new varieties of foam, the rapid development of the classification is also very complicated. At present, the classification of soft foam is still the processing method, that is, prepolymer method, semi-prepolymer method and one-step traditional classification is appropriate.


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