How to distinguish between CPP and BOPP?

The difference between CPP film and BOPP film: polypropylene used on the packaging.

There are two kinds of films: cast polypropylene (CPP) and biaxially oriented polypropylene (BOPP), and their properties are quite different due to their different manufacturing methods.

CPP film has good heat sealability and elongation.

Large, mostly used for the inner layer of composite packaging bags, especially for high temperature resistant (more than 121) retort bags, it can also manufacture 145 high temperature resistant to short-term sterilization and cooking of composite bags, and can also be vacuum-plated and then compounded with BOPP, PET, OPA, PT, etc.

BOPP film has very good transparency, heat resistance, barrier and mechanical strength are better than CPP film, and the heat sealability is poor. It is often used for the outer layer of software package composite bags, with LDPE, EVA or aluminum foil with good heat sealability.

and other composite uses.

In addition to BOPP and CPP, there is also a kind of high-transparency polypropylene manufactured by blow-down water cooling, which has the same transparency as BOPP and has good heat sealability.

Summary. Hello, although BOPP and OPP are only one letter apart, they are actually different. The difference between BOPP and OPP is that one is longitudinal stretching, and the other is stretching both longitudinally and transversely.

Hello judging the mountain, although BOPP and OPP are only one letter apart, but there is actually a difference between them. The difference between BOPP and OPP is that one is longitudinal stretching, and the other is stretching both longitudinally and horizontally.

This is related to the molecular structure, and polymers generally do not have anisotropy, so there is no difference in the use of materials. There are some differences between unidirectional and bidirectional stretching. In the unidirectional stretching process, the injected film material is formed through the nozzle rubber section into the stretching unit consisting of a number of rolls with different rotation speeds.

As a result, the thickness of the film can be changed accordingly as the length changes. Unidirectional stretching increases the tear strength of the film, so braided threads for ropes, packing tapes or bags are produced using this process. The thickness of the film is between 25 and 800 m.

In biaxially stretching, the film that has been pre-stretched in the meridional direction is stretched in the orthogonal direction at the same length as the extrusion direction. With the development of linear motors, it is possible to flexibly connect the above-mentioned stretching and sencheng processes together and to form high-efficiency longitudinal and horizontal bidirectional stretching, which is the so-called bidirectional stretching"Sync"Stretching, without the need for complex conveyors and chain structures. Manufacturers of this synchronous tensile machine believe that the higher the uniformity of polymer stress, the higher the coefficient of elasticity, tear strength and tensile strength of the product.

I hope mine can help you, oh, and I wish you a happy life.

It is difficult to distinguish CPP and BOPP purely from the appearance, especially when it comes to ** in practice, it is easier to distinguish, because the performance of CPP and BOPP is significantly different in the way to distinguish CPP and BOPP in reality:

One is to tear by hand, it is CPP that is easy to tear, and it is BOPP that is not easy to tear The second is to do heat sealing, which can be sealed is CPP, and what cannot be sealed is BOPP, because BOPP has no heat sealability.

The third is hand rubbing, CPP is softer, hand rubbing is basically no sound, BOPP is harder, hand rubbing has a sound.

There are other ways to distinguish between CPP and BOPP, which I won't go into here.

I heard that adding this ingredient to milk powder can promote calcium absorption, but she wants to know what this ingredient is, what role does it play in milk powder, and what benefits will it do to the baby?

What is CPP?

Casein phosphopeptides (CPP), ** from high-quality bovine milk casein, are a new type of functional nutritional enhancer prepared through biotechnology. It can effectively improve the absorption and utilization rate of bivalent minerals such as calcium, iron, zinc and so on, and is known as the "king of mineral carriers".

Can CPP in Milk Powder Really Promote Calcium Absorption?

The answer is yes, CPP is a nutritional fortifier, which is an optional nutrient in infant formula, which can be said to be a special nutritional fortification formula. Traditional calcium supplementation mostly adopts the method of increasing calcium intake and supplementing vitamin D, but the absorption receptor of calcium is affected by phytic acid and oxalate, and because the human body absorbs calcium mainly in the lower part of the small intestine, and the lower part of the small intestine is weakly alkaline, calcium is easy to precipitate, affecting absorption.

Mineral carrier casein phosphopeptide CPP is a natural physiologically active peptide isolated from milk protein by biotechnology, which can form soluble casein complex with calcium in the weak alkaline environment of the human small intestine, prevent calcium precipitation, and promote the absorption of calcium by the human body.

Scientific studies have proven that under normal conditions, the absorption rate of various calcium sources is almost the same. The reason why dairy products are one of people's favorite calcium supplements is that in addition to the rich calcium content of milk, it is also because the milk enzyme protein can generate part of CPP through the action of intestinal protease in the body, and CPP can promote the absorption and utilization of calcium.

Which milk powders contain CPP?

Nowadays, more and more milk powder brands are adding CPP to their formulas, such as Hypnuokai Hezhi, Wandashan Qinbei, Yashili Jingpo, Ausnutrito, Feihe Xingfeifan, Renzhizhijia Beibi, Gaopei Bingzhen, Meilu Youpei, Xi'an Zhihengyue, Shiyoule, Junlebao Zhizhen, Corolla Gaojie, etc.

Standards for the addition of CPP to milk powder:

According to China's "National Food Safety Standard for the Use of Food Nutrition Enhancers GB14880-2012", casein phosphopeptides must be added to infant formula, that is, 300mg 100g; 

Hello, casein phosphopeptide (CPP) is a biologically active polypeptide prepared by biotechnology with bovine milk casein as raw material, which is mainly used in nutritional health foods and dairy products fortified with calcium, iron and zinc.

Calcium deficiency is a worldwide nutritional problem, and to solve the problem of calcium deficiency, we must start from two aspects at the same time, one is to increase calcium intake, and the other is to improve the absorption and utilization of calcium. Many people know that vitamin D can promote calcium absorption, but CPP has more advantages than CPP.

Hello, BOPP and OPP are both polypropylene film materials, and their differences mainly lie in the production process and performance characteristics. BOPP stands for Biaxially Oriented Polypropylene Film, which is a film material made of polypropylene as raw material and biaxially stretched. BOPP film has excellent transparency, high strength, abrasion resistance, moisture resistance, oxygen insulation, chemical corrosion resistance and other characteristics, and is widely used in food packaging, pharmaceutical packaging, stationery packaging, electronic product packaging and other fields.

OPP stands for Unidirectional Stretching Polypropylene Film (Oriented Polypropylene Film), which is a film material made of polypropylene as raw material through unidirectional stretching. OPP film has good transparency, flatness, abrasion resistance, anti-static and other characteristics, and is widely used in tobacco packaging, gift packaging, wide lead audio and video product packaging, paper lamination and other fields. To sum up, although BOPP and OPP are both polypropylene film materials, they are also different in application fields due to different production processes and performance characteristics.

Summary. BOPP (biaxially extended polypropylene film) and OPP (polypropylene film) are two types of plastic films that are widely used in the packaging industry. The differences between them are as follows:

Manufacturing process: BOPP is manufactured by a two-way extension process, which gives the film better mechanical strength and transparency. OPP, on the other hand, is manufactured by unidirectional extension or direct extrusion.

Physical properties: Compared with OPP, BOPP has high tensile strength, flexural strength and tear resistance. This makes the BOPP film more robust and durable in packaging.

Transparency: Due to the bi-directional extension of the manufacturing process, BOPP film performs better in terms of transparency, which can provide clearer, brighter packaging results. OPP films may be slightly less transparent than BOPP films.

BOPP (biaxially extended polypropylene film) and OPP (polypropylene bonding film) are two types of plastic films that are widely used in the packaging industry. The differences between them are as follows: Manufacturing Process:

BOPP is manufactured by the process of two-way extension of the canopy, which gives the film better mechanical strength and transparency. OPP, on the other hand, is manufactured by unidirectional extension or direct extrusion. Physical Characteristics:

Compared with OPP, BOPP has higher tensile strength, flexural strength and tear resistance. This makes the BOPP film more robust and durable in packaging. Transparency:

Due to the bi-directional manufacturing process, BOPP films perform better in terms of clarity and can provide a clearer, brighter packaging effect. OPP films may be slightly less transparent than BOPP films.

Application field: BOPP film is often used in high-demand food packaging, tobacco packaging, book covers, etc. OPP film is often used in the packaging of daily items, such as potato chip bags, candy packaging, etc.

Applications: BOPP film is usually used in high-profile food packaging, tobacco, packaging, book covers, etc. The OPP film is often used in the packaging of daily items, such as potato shake bags, candy spine packaging, etc.

It should be noted that although BOPP and OPP are different in manufacturing and physical properties, both are variants of polypropylene film. The choice of which embedded film to use depends on factors such as the specific packaging needs, cost-effectiveness and product characteristics.