In addition, PP wetting tension KV/m is 31, compatibility is 8.1, fatigue-resistant bending can reach 100,000 times, brittle temperature is -35°C, oxygen permeability is 1.50, water absorption is 0.005 or less, water vapor permeability is 0.6 g/m2hr/mm, high shrinkage, slightly impervious flavor, high ultraviolet (366nm) permeability, good oil impermeability, gas impermeability, thermal blocking, non-charged Poor.
Another major factor affecting the quality of packaging is transparency. In order to accelerate the crystallization of PP, the crystal structure of the surface of the product is made uniform to form a fine spherulite structure. Normally, 0.01%-0.05% DBS nucleating agent and antimony trioxide anti-flame retardant are added. The price of domestically produced SKG-Y5988 is not only lower than 2/5 of that of foreign countries, and its quality can be comparable to it.
Stretching (orienting) in PP means that the free surface of its internal structural units (such as talons or grains, etc.) is oriented, following some preferential directions, rather than being completely random. Because it gets a certain degree of orientation when it flows and deforms. Orientation is an important aspect of the structure of the molecule that reflects the state of aggregation. But its performance shows an anisotropy. Properly adjusting the orientation can change the properties and uses of PP stretch film in a wide range - fiber, monofilament, tape, narrow-band orientation and tear film. When we stretch orientation above the melting point and above the glass transition temperature, The quasicrystal obtained due to quenching (low crystallinity) is unstable, while the progressive cooling crystallinity is relatively high and accordingly is stable. For example, it can be transformed into monoclinic crystals at 70°C; only half of the transformations occur at 110°C, while most of the transformations occur at 145°C, whereas monoclinic crystals begin to melt at 170°C. Production always involves the extrusion and stretching of sheets. The orientation is put together because the stretching temperature is set at a temperature between the maximum rate of crystallization and the melting point of -120-150°C. Although ordinary PP can greatly improve weatherability and transparency, branching degree and gloss retention after adding a nucleating agent, it is more important that the crystallization rate in the PP system doubles. As the number of crystal growth increases in the same system and the size of the crystal decreases, the result is that the crystal is smaller than the wavelength of visible light to allow light to pass through, thereby enhancing the transparency and greatly reducing the surface defects of its products. However, the effective temperature of domestically produced SKG-Y5988 is 185-260°C. Then, in practice, we need to mix and disperse the PP resin after it is dispensed. Otherwise, the purpose of adding organic nucleating agents cannot be achieved.
Second, we have a stretch ratio of about 7 in the stretching process. The draw ratio also has a problem of control of the ambient humidity and stretching temperature of the shop. For example, at Shijiazhuang Marine Plastics Packaging Co., Ltd., although at a high draw ratio, the strength of the product can be improved, the residual elongation can be made smaller, but the transparency is affected.
3. The application of additives indicates that the packaging technology has been revitalized in recent years. Practice has proved that there are no packaging materials without additives and no additives without materials. Therefore, in addition to the above examples of the use of additives, we will also introduce the following functions and dosages of additives.
3.1 Stabilizers. 3.1.1 Organic salts, organic tin, and pure organic compounds in stabilizers are divided into: 1 long-acting heat stabilizer, generally used in an amount of 1%-3%, mainly using the molecular weight of MW30N-1200; 2 zinc stearate , calcium stearate, barium stearate and so on. 3.1.2 Light Stabilizer: The dosage is 0.01%-0.05%. The ultraviolet ray receives OV-P, UV-326, UV-327 and so on. 3.1.3 The main antioxidant; The amount of 0.1% -0.5%. 1 General use of DLTP, namely phenolic antioxidants; 2 auxiliary antioxidants: The amount of 0.1% -0.5%, and the use of DSTP to make the white turbidity tends to PP (that is, sulfide esters); 3 optional tetradecyl ester ;4 can also add Sandunovr3212 to improve the oxygen absorption of metallic ink. 3.1.4 Biocides: The amount of 0.1%-0.2%, there are more than 300 kinds of chemicals used for antimicrobial erosion, but PP has not been successfully reported in this area. 3.1.5 In addition to the three major categories that have been described, there are light shielding agents, quenchers, and free radical agents.
3.2 Characteristic additives. 3.2.1 Characteristics Additives; dosage of 100% -30%, the market is often divided into inorganic and organic fillers such as calcium, wood flour, white carbon black, talcum powder and so on. 3.2.2 enhancer: dosage 10% -40%, support mother, wollastonite, silicon carbide flakes, talcum powder, glass fiber, carbon fiber and so on. 3.2.3 coupling agent: often referred to as modifier, the amount of 0.1% -5%. Commercially available and divided: 1 silicon organosilanes, organic aluminum acid lipids, etc.; 2 lanthanides: organic phthalates, Organic aluminates; 3 phosphate esters. 3.2.4 plasticizer and reactive plasticizer: The amount of 0.1% -1%. 1 monomer molecular weight between 200-600. 2 The polymerization type is between 1000 and 8000. Yixiu Industry is divided into: Phosphoric acid esters, phthalic acid, aliphatic dibasic acid esters, epoxy compounds, polyesters, chlorine compounds, all Benzoic acid esters, trioctyl trimellitate and other 11 series. However, most of the PP materials used are phthalate or polyvinyl chloride resins. 3.2.5 Colorant: Inorganic and organic dyes, etc., dosage 30% -0.8% (whitener, titanium dioxide, phthalocyanine blue, benzidine yellow, plastic red, etc.). 3.2.6 Impact Modifiers: The amount of 1%-10%, while most of PP uses polybutadiene and olefin (PE) thermoplastic elastomers to improve the tear strength and brittleness of PP sheets or films. 3.2.7 flame retardant: It is divided into: 1 added type; 2 reactive type. The dosage is 0.1%-0.5%. For example, aluminum hydroxide, antimony trioxide and organic hightata flame retardant tree wax, such as polyvinyl chloride. 3.2.8 antistatic agent, the general amount of 1%-5%.
3.3 Processing additives. Processing additives are generally 0.05%-0.25%, while PP films are rarely used. Usually it is divided into: 3.3.1 foaming agent, 1 physical foaming agent, generally choose low-boiling alcohols, ethers, ketones and aromatic hydrocarbons; 2 chemical foaming agent, sodium bicarbonate, AC and so on. 3.3.2 Lubricants: The amount is 0.01%-0.1%, often fatty amides and hydrocarbons, etc. The addition of this agent can often migrate to the surface of the printing ink film, so use caution. 3.3.3 processing release agent: The amount of 0.01% -0.1%. PP materials often use organic silicon compounds, fluoropolymers, and polyethylene wax as the target. 3.3.4 Aero-Blocking Agent: 1 The traditional method is to add talcum powder at the time of loading, but it often leads to excessive dust and pollutes the workshop environment; 2 most of the fatty acid metal salt can be introduced into the PP film system. 3.3.5 slip agent: 1 often low-cost talcum powder as a post-print additive; 2 is now used more oil, erucamide organic additives directly in the PP ingredients added. 3.3.6 Compatibilizer: PCL, which is often regarded as the third component, can be used in the PP system. 3.3.7 scented agent: P-type which can be applied to PP is preferable. 3.3.8 Tackifier: Suitable for PP packaging and printing auxiliaries are: 1 Dimer wood rosin (softening point 145°C); 2 Poly (B-pinene) terpene resin (softening point 115°C). 3.3.9 Electroneutral superdispersants need to be explored.
3.4 Reaction Control Agents. The dosage is often controlled between 1% and 5%. Such as 3.4.1 catalyst: more than TiCl4 or Ticl3 or AI (C2H5) 3 can be composed of the system. This is a type of substance that can change the speed of a chemical reaction without itself being consumed in the reaction. So far PP has not found one of the most effective additives and stereotypes. 3.4.2 Initiator: Although its role is different from that of 3.4.1, there is still no complete theory to explain PP application. 3.4.3 polymerization inhibitor: The purpose is to remove the PP before polymerization, so as to avoid the post-induction period, the auxiliary phenols, steroids and so on. 3.4.5 Cross-linking agent: Dicumyl peroxide is commonly used in PP materials. 3.4.6 Auxiliary materials are mostly white oil and other deeper agents. 3.4.7 Anti-mold agents: There are 1 pentachlorophenol: 2 organic mercury compounds; 3 copper, etc. to improve the deterioration caused by microorganisms. 3.4.8 Chain transfer agents are thiols and the like used to adjust the molecular weight of PP. 3.4.9 Terminating agents: such as chlorine and simple hydrocarbons to terminate the chain growth of polymer free radicals. 3.4.10 There are chemical reagents that can control the PH value of PP materials, etc. This article will not repeat them.
3.5 The scope and content of the study. (1) Aside from the additives, we remove the chlorine species from ethylene-related molecules to prevent the formation of fog and haze when the PP is exposed to flash (metal) printing inks. Therefore, the more complete the dechlorination, the less chance of fog generation - and the more transparent it is. (2) The use of high-purity aromatic phosphorous ester antioxidants is significantly better than aliphatic pentaphosphates, which suppresses the oxidation of PP dust and pollutes the environment. (3) Incorporation of a small amount of base to improve its storage stability. (4) Adding a certain amount of water-resistant wax or other suitable hydrophobic compound and increasing the molecular weight of the metal purifying agent or introducing into its molecule genes that are compatible with PP to improve its sublimation and blooming properties... ( 5) How to ensure the reuse of PP and improve the extensibility of human resources.
4. Concluding remarks In ancient and modern times, although consumers are ultimately concerned about environmental protection, they accept commodities. But the carrier that becomes the other half of the combination of quality and environmental protection is: the integrity of the art of packaging and printing, so that it can satisfy the competition of the packaged goods; thus it is possible to import internationally certified rivers and stand in the market economy. The tide of competition is to concentrate on high technology, conquer consumers, and achieve the purpose of creating profits. (Wen Liujia Ju He Lizheng)
Another major factor affecting the quality of packaging is transparency. In order to accelerate the crystallization of PP, the crystal structure of the surface of the product is made uniform to form a fine spherulite structure. Normally, 0.01%-0.05% DBS nucleating agent and antimony trioxide anti-flame retardant are added. The price of domestically produced SKG-Y5988 is not only lower than 2/5 of that of foreign countries, and its quality can be comparable to it.
Stretching (orienting) in PP means that the free surface of its internal structural units (such as talons or grains, etc.) is oriented, following some preferential directions, rather than being completely random. Because it gets a certain degree of orientation when it flows and deforms. Orientation is an important aspect of the structure of the molecule that reflects the state of aggregation. But its performance shows an anisotropy. Properly adjusting the orientation can change the properties and uses of PP stretch film in a wide range - fiber, monofilament, tape, narrow-band orientation and tear film. When we stretch orientation above the melting point and above the glass transition temperature, The quasicrystal obtained due to quenching (low crystallinity) is unstable, while the progressive cooling crystallinity is relatively high and accordingly is stable. For example, it can be transformed into monoclinic crystals at 70°C; only half of the transformations occur at 110°C, while most of the transformations occur at 145°C, whereas monoclinic crystals begin to melt at 170°C. Production always involves the extrusion and stretching of sheets. The orientation is put together because the stretching temperature is set at a temperature between the maximum rate of crystallization and the melting point of -120-150°C. Although ordinary PP can greatly improve weatherability and transparency, branching degree and gloss retention after adding a nucleating agent, it is more important that the crystallization rate in the PP system doubles. As the number of crystal growth increases in the same system and the size of the crystal decreases, the result is that the crystal is smaller than the wavelength of visible light to allow light to pass through, thereby enhancing the transparency and greatly reducing the surface defects of its products. However, the effective temperature of domestically produced SKG-Y5988 is 185-260°C. Then, in practice, we need to mix and disperse the PP resin after it is dispensed. Otherwise, the purpose of adding organic nucleating agents cannot be achieved.
Second, we have a stretch ratio of about 7 in the stretching process. The draw ratio also has a problem of control of the ambient humidity and stretching temperature of the shop. For example, at Shijiazhuang Marine Plastics Packaging Co., Ltd., although at a high draw ratio, the strength of the product can be improved, the residual elongation can be made smaller, but the transparency is affected.
3. The application of additives indicates that the packaging technology has been revitalized in recent years. Practice has proved that there are no packaging materials without additives and no additives without materials. Therefore, in addition to the above examples of the use of additives, we will also introduce the following functions and dosages of additives.
3.1 Stabilizers. 3.1.1 Organic salts, organic tin, and pure organic compounds in stabilizers are divided into: 1 long-acting heat stabilizer, generally used in an amount of 1%-3%, mainly using the molecular weight of MW30N-1200; 2 zinc stearate , calcium stearate, barium stearate and so on. 3.1.2 Light Stabilizer: The dosage is 0.01%-0.05%. The ultraviolet ray receives OV-P, UV-326, UV-327 and so on. 3.1.3 The main antioxidant; The amount of 0.1% -0.5%. 1 General use of DLTP, namely phenolic antioxidants; 2 auxiliary antioxidants: The amount of 0.1% -0.5%, and the use of DSTP to make the white turbidity tends to PP (that is, sulfide esters); 3 optional tetradecyl ester ;4 can also add Sandunovr3212 to improve the oxygen absorption of metallic ink. 3.1.4 Biocides: The amount of 0.1%-0.2%, there are more than 300 kinds of chemicals used for antimicrobial erosion, but PP has not been successfully reported in this area. 3.1.5 In addition to the three major categories that have been described, there are light shielding agents, quenchers, and free radical agents.
3.2 Characteristic additives. 3.2.1 Characteristics Additives; dosage of 100% -30%, the market is often divided into inorganic and organic fillers such as calcium, wood flour, white carbon black, talcum powder and so on. 3.2.2 enhancer: dosage 10% -40%, support mother, wollastonite, silicon carbide flakes, talcum powder, glass fiber, carbon fiber and so on. 3.2.3 coupling agent: often referred to as modifier, the amount of 0.1% -5%. Commercially available and divided: 1 silicon organosilanes, organic aluminum acid lipids, etc.; 2 lanthanides: organic phthalates, Organic aluminates; 3 phosphate esters. 3.2.4 plasticizer and reactive plasticizer: The amount of 0.1% -1%. 1 monomer molecular weight between 200-600. 2 The polymerization type is between 1000 and 8000. Yixiu Industry is divided into: Phosphoric acid esters, phthalic acid, aliphatic dibasic acid esters, epoxy compounds, polyesters, chlorine compounds, all Benzoic acid esters, trioctyl trimellitate and other 11 series. However, most of the PP materials used are phthalate or polyvinyl chloride resins. 3.2.5 Colorant: Inorganic and organic dyes, etc., dosage 30% -0.8% (whitener, titanium dioxide, phthalocyanine blue, benzidine yellow, plastic red, etc.). 3.2.6 Impact Modifiers: The amount of 1%-10%, while most of PP uses polybutadiene and olefin (PE) thermoplastic elastomers to improve the tear strength and brittleness of PP sheets or films. 3.2.7 flame retardant: It is divided into: 1 added type; 2 reactive type. The dosage is 0.1%-0.5%. For example, aluminum hydroxide, antimony trioxide and organic hightata flame retardant tree wax, such as polyvinyl chloride. 3.2.8 antistatic agent, the general amount of 1%-5%.
3.3 Processing additives. Processing additives are generally 0.05%-0.25%, while PP films are rarely used. Usually it is divided into: 3.3.1 foaming agent, 1 physical foaming agent, generally choose low-boiling alcohols, ethers, ketones and aromatic hydrocarbons; 2 chemical foaming agent, sodium bicarbonate, AC and so on. 3.3.2 Lubricants: The amount is 0.01%-0.1%, often fatty amides and hydrocarbons, etc. The addition of this agent can often migrate to the surface of the printing ink film, so use caution. 3.3.3 processing release agent: The amount of 0.01% -0.1%. PP materials often use organic silicon compounds, fluoropolymers, and polyethylene wax as the target. 3.3.4 Aero-Blocking Agent: 1 The traditional method is to add talcum powder at the time of loading, but it often leads to excessive dust and pollutes the workshop environment; 2 most of the fatty acid metal salt can be introduced into the PP film system. 3.3.5 slip agent: 1 often low-cost talcum powder as a post-print additive; 2 is now used more oil, erucamide organic additives directly in the PP ingredients added. 3.3.6 Compatibilizer: PCL, which is often regarded as the third component, can be used in the PP system. 3.3.7 scented agent: P-type which can be applied to PP is preferable. 3.3.8 Tackifier: Suitable for PP packaging and printing auxiliaries are: 1 Dimer wood rosin (softening point 145°C); 2 Poly (B-pinene) terpene resin (softening point 115°C). 3.3.9 Electroneutral superdispersants need to be explored.
3.4 Reaction Control Agents. The dosage is often controlled between 1% and 5%. Such as 3.4.1 catalyst: more than TiCl4 or Ticl3 or AI (C2H5) 3 can be composed of the system. This is a type of substance that can change the speed of a chemical reaction without itself being consumed in the reaction. So far PP has not found one of the most effective additives and stereotypes. 3.4.2 Initiator: Although its role is different from that of 3.4.1, there is still no complete theory to explain PP application. 3.4.3 polymerization inhibitor: The purpose is to remove the PP before polymerization, so as to avoid the post-induction period, the auxiliary phenols, steroids and so on. 3.4.5 Cross-linking agent: Dicumyl peroxide is commonly used in PP materials. 3.4.6 Auxiliary materials are mostly white oil and other deeper agents. 3.4.7 Anti-mold agents: There are 1 pentachlorophenol: 2 organic mercury compounds; 3 copper, etc. to improve the deterioration caused by microorganisms. 3.4.8 Chain transfer agents are thiols and the like used to adjust the molecular weight of PP. 3.4.9 Terminating agents: such as chlorine and simple hydrocarbons to terminate the chain growth of polymer free radicals. 3.4.10 There are chemical reagents that can control the PH value of PP materials, etc. This article will not repeat them.
3.5 The scope and content of the study. (1) Aside from the additives, we remove the chlorine species from ethylene-related molecules to prevent the formation of fog and haze when the PP is exposed to flash (metal) printing inks. Therefore, the more complete the dechlorination, the less chance of fog generation - and the more transparent it is. (2) The use of high-purity aromatic phosphorous ester antioxidants is significantly better than aliphatic pentaphosphates, which suppresses the oxidation of PP dust and pollutes the environment. (3) Incorporation of a small amount of base to improve its storage stability. (4) Adding a certain amount of water-resistant wax or other suitable hydrophobic compound and increasing the molecular weight of the metal purifying agent or introducing into its molecule genes that are compatible with PP to improve its sublimation and blooming properties... ( 5) How to ensure the reuse of PP and improve the extensibility of human resources.
4. Concluding remarks In ancient and modern times, although consumers are ultimately concerned about environmental protection, they accept commodities. But the carrier that becomes the other half of the combination of quality and environmental protection is: the integrity of the art of packaging and printing, so that it can satisfy the competition of the packaged goods; thus it is possible to import internationally certified rivers and stand in the market economy. The tide of competition is to concentrate on high technology, conquer consumers, and achieve the purpose of creating profits. (Wen Liujia Ju He Lizheng)
1. Take-out containers: Sugarcane pulp containers are ideal for take-out and food delivery services. They are sturdy and can hold both hot and cold foods. Their natural insulating properties help keep food at the desired temperature longer.
2. Bowls and plates: bagasse pulp containers can be molded into a variety of shapes and sizes, making them suitable for holding bowls and plates. They are sturdy enough to hold heavy, spicy plates without getting wet or leaking.
3. Trays: bagasse pulp trays are commonly used in fast food restaurants and cafeterias to serve meals. They can hold a variety of foods, such as burgers, fries and salads, in different compartments, making them easy for customers to carry and eat.
4. Cups: Bagasse pulp cups are a great alternative to traditional plastic cups. They are suitable for hot and cold drinks, including coffee, tea, smoothies and soft drinks. They also come in different sizes to accommodate different drink servings.
5. Baking and microwaving: Sugarcane pulp box are safe in both ovens and microwaves for easy reheating of food. They can be used to bake individual desserts or to heat up leftovers.
6. Compostable and biodegradable: bagasse pulp containers are fully compostable and biodegradable. They can be easily disposed of in a compost bin or commercial composting facility, where they break down into organic matter. This makes them an environmentally friendly option compared to plastic or styrofoam containers that take hundreds of years to break down.
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EVER GREEN(ZHEJIANG)NEW MATERIAL CO., LTD / KUNSHAN GREENPACK CO.,LTD , https://www.jiaxingevergreen.com