Application of plastic film auxiliaries

  Plastic film products are widely used for their advantages of light weight, thin shape, low price, easy to carry and change shape. Especially in food and daily necessities packaging, agricultural covering materials, etc., the quantity and quality of plastic film products are constantly improving, and the functional requirements for new film materials are also increasing. To improve the quality of the film and enhance its functionality, simply relying on the change of the resin matrix and the improvement of the molding process can not meet the needs of market development, adding various functional additives has become a simple and efficient means to achieve the functionalization of the film.

  Biaxially stretched film materials have been playing an important role in film packaging, and biaxially stretched polypropylene (BOPP), polyester (BOPET), nylon (BOPA) and other applications are increasingly widespread. Traditional PVC film is widely used in various vegetable and fruit preservation, long-term frozen food packaging, microwave baking food packaging, electronic components packaging conductive film. In addition, the production of products such as cast polypropylene (CPP) and cast polyethylene (CPE) is also large. The additive products with the above packaging film materials mainly include antistatic agents, smoothing and anti-adhesion agents, stiffeners, heat stabilizers, antioxidants and barrier agents, etc.

 Antistatic agent

  Industrial antistatic agents are mainly single compounds or compounds of non-ionic and ionic surfactants. According to whether the hydrophilic group in its molecules can be ionized, it is divided into ionic and non-ionic types, and ionic types are divided into cationic types, anionic types and amphoteric types. The antistatic principle is to use its hydrophilic base to absorb water vapor in the air on the plastic surface, or to form a conductive layer on the surface to reduce the surface resistance value.

  Cationic antistatic agent has excellent antistatic performance, but it is usually poor thermal stability, easy to decompose and discoloration under high temperature processing conditions, and is generally only used in PVC products. The anionic antistatic agent can not be used for thin film products because it will affect the transparency.

  Non-ionic antistatic agent has the characteristics of low toxicity, good thermal stability, and is not easy to cause plastic aging, which makes it become the main internal additive antistatic agent in packaging materials. The main varieties are fatty acid polyol esters, fatty acids, alcohols, amines of ethylene oxide admixtures and other products.

 Smooth and anti-sticking agent
  Modern plastic processing is developing in the direction of automation, high-speed and high-quality. The faster the processing speed, the easier it is to generate static electricity due to friction, and the easier it is to adhere between the film (plastic products), which seriously hinders the high-speed extrusion; The better the transparency of the film, the higher the processing temperature, the easier the agglomeration and adhesion. Therefore, highly efficient smoothing agents and anti-adhesive agents play an extremely important role in plastic production and automated packaging.

  Domestic common varieties of smoothing agents are amines (oleic acid amine and erucic acid amine), soap (calcium stearate, etc.) and organosilicone (silicone). The latter is liquid, inconvenient to add and expensive. Although soap products are cheap, the effect is not ideal, and the amount of addition is large, and it can not be used in medium and high-end products. The common smoothing agents in packaging films are mostly amines, such as oleate amines used in LDPE films; Erucate amine for PP films.

  And the anti-adhesion agent is also called the opening agent, generally inorganic fine particles, such as: silica and so on. However, because the refraction coefficient of the traditional inorganic opening agent is different from that of the base resin, it often affects the fog degree. The newly developed polymer particles as opening agents have solved this problem.

 Stiffener
  Stiffening agent for packaging materials, also known as stiffening agent, is mainly used in BOPP heat shrink film for tobacco to improve the crispness of BOPP film, improve the appearance of packaged goods, so as to enhance the value of goods. At present, the advantage and disadvantage of stiffening agent is mainly measured by examining the degree of improvement of elastic modulus of film. For tobacco BOPP heat shrink film, the performance requirements of the manufacturer for the stiffener also include: can not affect the film fog degree and other mechanical properties, reduce the heat sealing temperature.

  At present, the research and development of stiffeners are mainly concentrated in two fields. One approach is to alloy PP with polymer containing rigid chain segments in the structure to improve the elastic modulus of BOPP. Commonly used polymers are: polycyclopentadiene and so on. The other way is to implement hardening according to the principle of promoting nucleation, through the existence of fine particles to play the role of heterogeneous nucleation, promote and improve the crystallization of PP, make its grain uniform and fine, to improve the rigidity of the product. Under the influence of this idea, the application of using organic nucleating agents to achieve stiffening has been developed.

Antioxidant
  Because of the particularity of its application, such as packaged food, cosmetics, etc., the hygiene requirements of antioxidants are high, although many common antioxidants have been tested for toxicity, but the application is still difficult to avoid worrying. Vitamin E, a new antioxidant, has excellent thermal oxidation resistance and no toxic side effects, which is favored by the packaging products industry.

 Blocking agent
  In order to prevent all kinds of gas through the film and extend the storage period of the packaging material, the market demand for new barrier packaging films is increasing. In addition to the use of good barrier resin and SiOx vapor surface deposition treatment, adding a certain amount of barrier agent is also an important means to obtain new high barrier packaging materials.

Our Products：

https://www.potop-polymer.com/biaxial-stretcher/biaxial-film-stretcher-manufacturers.html

 Casting film test line is composed of a main machine (twin-screw extruder) and a set of auxiliary machines (casting molding machine). It is mainly used for blending modification of polymer materials, formulation research and development of new materials, process optimization, quality control and small-scale production.The machine can carry out online dynamic testing of the processing parameters of various materials under conditions close to the actual processing, and the test data (including melt temperature, melt pressure, screw speed, motor current, etc.) can be displayed in real time in the form of curves or figures, providing reliable experimental data for users' scientific research.

• Blending modification

• Filling modification

    Adding various inorganic fillers, such as calcium carbonate, talc powder, etc. to the plastic matrix can greatly reduce the cost of products and improve the physical and mechanical properties of materials.

• Functionalization of composite materials

   Mixing various additives in plastics, such as stabilizers, flame retardants, colorants, etc., to obtain new materials with uniform dispersion and specific functions.

• Enhanced modification

   In order to improve the physical and mechanical properties of the composites, reinforced components such as glass fiber and carbon fiber are added to the plastic matrix.

  Related products：https://www.potop-polymer.com/lab-compounding-extruder/specialized-labs-extrusion-laminating-test.html

  POTOP will participate in the upcoming Orlando Plastic and Rubber Industry Exhibition (NPE) in the United States, and will provide you with efficient intelligent polymer experimental analytical instrument solutions!
  David Zhang, sales representative of POTOP Company, will attend this event on behalf of the company. As a leader in the plastics industry, POTOP is committed to continuous innovation, continuous improvement of product quality and production technology.

NPE:(2024.05.06-05.10)

• Duration: every 3 years
• Opening and closing hours: 09:00-18:00

• Host address: 9800 International Drive Orlando, FL 32819-8199 USA

• Exhibition hall: Orange County Convention Center

• Exhibition area: 110,000 square meters

• Number of exhibitors: 24,000

• Audience size: 66,000

  The Orlando Plastics and Rubber Industry Exhibition (NPE) is the largest and oldest plastics exhibition in the United States and the second largest plastics industry event in the world. The total area of the last exhibition is 110,000 square meters, 2396 exhibitors are from China, Japan, South Korea, Italy, Germany, Thailand, Mexico, Australia, etc., the number of exhibitors reached 65,810 people. With a total of 413 exhibitors from China, the country has the largest number of exhibitors outside the United States (1,250 exhibitors).
  Looking forward to meeting you!

Intro

OPP Film

• OPP tape:

• OPP bottle:

• OPP labels:

  Compared with paper labels, it has the advantages of transparency, high strength, moisture-proof, and not easy to fall off, although the cost has been increased, it can get a good label display and use effect. With the development of domestic printing process and coating technology, the production of self-adhesive film labels and printed film labels is no longer a problem, and it is foreseeable that the use of domestic OPP labels will continue to increase.

BOPP Film

  BOPP: bidirectional polypropylene film, also a kind of polypropylene.

  Commonly used BOPP films include: ordinary biaxial polypropylene film, heat seal biaxial polypropylene film, cigarette packaging film, biaxial polypropylene pearlized film, biaxial polypropylene metallized film, dull film, etc.

• Ordinary BOPP film

• BOPP heat sealing film

• BOPP cigarette packaging film

• BOPP pearl film

• BOPP metallized film

• BOPP extinction film

• BOPP anti-fog film

    Uses: Used for vegetables, fruits, sushi, flowers and other packaging.

CPP Film

  CPP: With good transparency, high gloss, good stiffness, good moisture resistance, excellent heat resistance, easy to heat seal and other characteristics.

•   CPP film is printed and bagged, suitable for: clothing, knitwear and flower bags; Film of documents and albums; Food packaging; And metallized film suitable for barrier packaging and decoration. Potential uses also include: food packaging, candy packaging (twist film), pharmaceutical packaging (infusion bag), in the fields of albums, folders and documents instead of PVC, synthetic paper, self-adhesive tape, name card holders, circular folders and standing bag composite materials.
•   CPP has excellent heat resistance. Since the softening point of PP is about 140℃, this kind of film can be used in hot filling, cooking bags, aseptic packaging and other fields. Coupled with excellent acid, alkali and grease resistance, it becomes the preferred material in the field of bread product packaging or laminating materials. It is safe in contact with food, has excellent presentation performance, does not affect the flavor of the internal food, and can choose different grades of resin to obtain the desired characteristics.

  As described above, the casting film production process generally adopts the T-die method.

  Compared with the tubular film method, the casting method eliminates the blowing stage, is simpler to operate, and produces less waste. Secondly, the orderly arrangement of chemical molecules makes the transparency, gloss and uniformity of the film improved, which is very suitable for advanced packaging. The casting part adopts electric up and down swing and forward and backward movement structure, which makes the operation more simple, and the corona part adopts air cooling and water cooling mode, which makes the product more difficult to deformation.

  The advantages of casting film machine with high quality process requirements: high surface finish, mirror roller with hard chrome coating, roll core of 304 stainless steel, reliable quality. The whole machine is driven by servo motor, which runs smoothly and accurately. Each roll of the laboratory small multi-layer co-extruder is independently driven by servo motor and runs stably. Each roll speed ratio can be freely adjusted. Advanced multi-axis synchronization technology ensures that each roll speed is synchronized. Advanced PLC control and mobile touch screen operation ensure system stability and improve operation convenience. In addition, we offer gravity feeders with optional melt pumps, as well as laboratory miniature multi-layer co-extruded calenders and laboratory miniature multi-layer co-extruded laminating machines. In addition, we can also choose the MDO longitudinal tensile unit to form the laboratory small online cast film MDO tensile line.

  Product Recommendation:
https://www.potop-polymer.com/laminating-and-coating-machine/polymers-laminate-and-coat-extrusion.html

 Mixing Technology

Mixing means that in order to improve the physical and mechanical properties of rubber products, improve the processing and molding process, reduce production costs, it is necessary to add various adjuvants in raw rubber or plastic glue, such as fillers, reinforcing agents, accelerators, vulcanizing agents, antioxidants, anti-scorching agents, etc. These adjuvants have solid, liquid and other materials, and the various adjuvants added are dispersed evenly. Make sure the properties of the compound are consistent. Therefore, the process of evenly dispersing various compounding agents to raw rubber or plastic rubber in the rubber mixing machine is called mixing, and the rubber produced by mixing is called mixing rubber.

  Mixing is the process of evenly mixing raw glue or plastic glue with various compounding agents through mechanical action. Poor mixing, the rubber material will have a variety of problems, such as scorch, spray frost, etc., so that the rolling, pressing, gluing, vulcanization and other processes are difficult to carry out normally, and lead to the performance of the finished product.

  The mixing process consists of four stages: mixing, dispersing, mixing and plasticizing. Raw rubber or plastic rubber is subjected to shearing and stretching in the rubber mixing machine to produce rheology and fracture, crushing, and fully contact with the compounding agent, so that it is mixed. This process is called the wetting stage or the powdering stage. The compound mixed with rubber is further broken into fine particles of tiny size under the action of mechanical force, while increasing the contact surface area and further improving the mixing uniformity. So it is also called microscopic dispersion. The process of uniform distribution of various compounds in raw or plasticized rubber. The so-called mixing means that the distribution uniformity of the compounding agent in the compound is only increased without changing the size of its particles.    Therefore, this process is also called macro dispersion or simple mixing. The rubber molecules continue to break under the mechanical force-chemical action, so that the viscosity decreases and uniform mixing is achieved. These processes do not occur in isolation, but alternately at the same time.

  Related process equipment recommendation:

https://www.potop-polymer.com/rheometer/laboratory-torque-rheometer-professional.html

https://www.potop-polymer.com/filter-pressure-value-tester/lab-capillary-rheometer-for-high-polymer.html