Gas chromatography is a term used to describe the group of analytical separation techniques used to analyze volatile substances in the gas phase. In gas chromatography, the components of a sample are dissolved in a solvent and vaporized in order to separate the analytes by distributing the sample between two phases: a stationary phase and a mobile phase. The mobile phase is a chemically inert gas that serves to carry the molecules of the analyte through the heated column. Gas chromatography is one of the sole forms of chromatography that does not utilize the mobile phase for interacting with the analyte. The stationary phase is either a solid adsorbant, termed gas-solid chromatography (GSC), or a liquid on an inert support, termed gas-liquid chromatography (GLC). For packaging materials, gas chromatography (GC) is used to analyse solvent residues in printing or adhesive layers. If solvent residue levels are too high, this poses a risk, as it could lead to undesirable odours or poor laminate adhesion. That is why we measure each production stage multiple times. A gas chromatograph (GC) is an analytical instrument that measures the content of various components in a sample. The analysis performed by a gas chromatograph is called gas chromatography. Principle of gas chromatography: The sample solution injected into the instrument enters a gas stream which transports the sample into a separation tube known as the "column." (Helium or nitrogen is used as the so-called carrier gas.) The various components are separated inside the column. The detector measures the quantity of the components that exit the column. To measure a sample with an unknown concentration, a standard sample with known concentration is injected into the instrument. The standard sample peak retention time (appearance time) and area are compared to the test sample to calculate the concentration. GBPI Design and Manufacture new GC Gas Chromatography GC9803 on 9th April 2019,its updating function as below,more details please feel free to contact us Standard PC side counter control software, built-in chromatographic workstation, PC side counter control and the host touch screen synchronous two-way control. The main machine adopts 7-inch color touch screen, which displays the flow value and pressure value of the air circuit electronically. Multi-core, 32-bit embedded hardware system ensures the reliable operation of the instrument. One-click start function. It has perfect system self-check function and automatic fault identification function. Quick opening after cooling system, from 250 ° to 50 ° cooling less than 10 minutes Memory function of 20 groups of samples was tested. RS232 communication port, LAM network port FID automatic ignition, no need for igniter

GBPI Packaging Testing Equipment Engineer Mr Yang in our pakistan customers laboratory supply overseas after-sales service and equipment training from 15th March to 29th March 2019. GBPI always pay great attention to our customers after-sales service. our engineer overseas training and services every 3 months to ensure our customers instruments working stable and help their work. This time Mr Yang mainly training and maintenance our pakistan customers water vapor permeability tester,oxygen permeation analyzer,tensile tester,gas chromatography

How to produce the aseptic bags? The production environment of aseptic bags needs to be performed in a clean room above level C. Aseptic bag production process is mainly divided into blown film, cutting, heat sealing bag, vacuum packaging, sterilization and so on. Blown film: Must first open the air purification system in the workshop, disinfect and sterilize the workshop and operating personnel, and then blow the membrane through the purified polyethylene particles at a certain temperature; Cutting: The tubular film obtained after blown film is cut into different size film barrels according to the customer’s requirements; Heat sealed bag: Sealing the film cylinder with a heat sealer; Vacuum packaging: The aseptic packaging bag after sealing is vacuum packed according to a certain amount; Because it is very easy to be polluted during the transportation. Sterilization: The packaged aseptic bags are gamma sterilized to achieve the sterility requirements of the product. Compared with ordinary food packaging bags, the essence of aseptic packaging bags is still a plastic bag, and its material and production process are not much different. However, aseptic bags must be carried out in a clean room, through a complex sterilization process to achieve the strict requirements of aseptic packaging. It is a specialized manufacturing process in which food, pharmaceutical, or other contents are sterilized separately from packaging. The contents are then inserted into the pouches in a sterile environment How to test your aseptic bags water vapor transmission rate WVTR? GBPI W501 Water Vapor Permeability Tester can greatly help you testing your aseptic bags WVTR,below introduce some technical details about our WVTR Tester W501 Application W501 Water Vapor Permeability Analyzer test the water vapor transmission rate of various materials, including: plastic film, composite film, aluminum-plated film, aluminum foil etc.; sheets, such as PP sheet, PVC sheet, rubber, building material, porcelain; other application, such as solar panel, paint film, medical patch etc. It is widely used in packaging, plastic film, food, pharmaceuticals, personal care industries, inspection agency, research institute, college and so on. Working Principle Gravimetric method. Fix the test sample in the middle of test chamber to separate the chamber into upper room and lower room; humid gas flows in upper room, and place desiccant device in lower room; as in lower room it remains dry (0-8%RH) by desiccant, water molecules penetrate through the sample from upper room into lower room, absorbed by desiccant; then the cup weight will increase; system weigh the increasing cup weight so as to calculate the water vapor transmission rate. Testing Standard: GB 1037, GB/T 16928, YBB00092003, ASTM E96, ASTM D1653, ISO 2528, TAPPI T464, DIN 53122-1, JIS Z0208

Before putting much faith in a Chinese factory's test results it makes sense to ensure that the laboratory which conducted the tests has a China laboratory accreditation certificate. Although many factory's have their own laboratories, few of these are independently certified so requesting testing by external testing body is a wise move in many circumstances. These testing bodies should be accredited and you can make sure of this by requesting a copy of their China laboratory accreditation certificate. What is a China Laboratory Accreditation Certificate? The China laboratory accreditation certificate is a certificate issued to test laboratories in Mainland China which have been deemed to conform to the requirements of international laboratory standard ISO/IEC 17025. The certificate is issued in two versions, one in Chinese and the other in English. Either way, the certificate is easily recognizable thanks to the prominently displayed "ilac-MRA" and "CNAS" logos. What Information is Contained in a China Laboratory Accreditation Certificate? China laboratory accreditation certificates are only issued by the China National Accreditation Service for Conformity Assessment (CNAS) and should be similar in appearance to the certificates above. Who Issues a China Laboratory Accreditation Certificate? As Mainland China's only signatory to the International Laboratory Accreditation Cooperation (ILAC) under the Mutual Recognition Arrangement (MRA), CNAS is the only authority which can issue China laboratory accreditation certificates. International Mutual Recognition China national accreditation system for conformity assessment has been a part of international accreditation multilateral recognition system, and is playing an important role in it. CNAS was the accreditation body member of International Accreditation Forum (IAF) and International Laboratory Accreditation Cooperation (ILAC)，as well as the member of Asia Pacific Laboratory Accreditation Cooperation (APLAC) and Pacific Accreditation Cooperation (PAC) GBPI CNAS Laboratory supply water vapor permeability testing,oxygen transmission rate testing,tensile testing,coefficient of friction testing,leakage testing,heat sealing testing etc.

In the food packaging industry, using a material composition that extends shelf life is a key component to ensuring the safety of the product and preserving the taste of the food. In addition, using packaging material that prolongs a products shelf life can drastically cut down on waste of perishable products, and creates a longer window for grocery stores to stock product before it reaches the hands of the consumer. A great way to achieve this is by using a packaging material that reduces the amount of oxygen that permeates the plastic, such as EVOH. So what is EVOH film and how does it contribute to increasing the shelf life of packaged food products? EVOH stands for Ethylene-vinyl alcohol copolymer and is a flexible, crystal clear, glossy thermoplastic copolymer. This material has excellent flex-crack resistance, and exhibits a high resistance to hydrocarbons, oils and organic solvents. EVOH is known for having some of the best barrier resistance to gases such as oxygen, nitrogen, and carbon dioxide which makes it particularly suited for packaging food, drugs, cosmetics, and other perishable products. When compared to other common films, EVOH is considered to have superior barrier properties. You might be thinking so how to test EVOH oxygen transmission rate.GBPI Oxygen Permeability Analyzer Y110 help you find out the answer.This oxygen permeation tester is our GBPI design for EVOH Barrier film oxygen transmission rate testing,popular for our EVOH Barrier material customers. Advanced technology Temperature control: International advanced electromagnetic technology, program controlled, auto heating and cooling; and no need of external accessories. Precision: 0.1℃. Humidity control: Dual gas flow method(dry gas and humid gas), with broad range, high precision (1%RH) and stable flow. Carrying cutting-edge ARM controlling system, can run independently without computer.