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Medicinal aluminum foil printing and the quality of the material properties and detection
发布时间:2015-1-24 15:12:27 点击次数:

Pharmaceutical blister packaging developed in Europe in the 1930 s, our country in the early 70 s blister packaging and "inhibits PTP" materials are mainly imported. Domestic successively from guangzhou in the 80 s, lianyungang, jinzhou, has introduced Japan's medicinal "inhibits PTP aluminum foil printing and coating equipment, its main raw materials still need to be imported. In the 90 s, our country not only produces monochrome "inhibits PTP medicinal aluminum foil coating equipment, but also mass production of color, golden series" inhibits PTP "products, the main material of aluminum foil, aluminum foil ink and adhesive can meet the needs of domestic production. Medicinal "inhibits PTP" as production of packaging materials manufacturers, select high-quality raw materials is a prerequisite to produce customer satisfaction products, so this article by the domestic "inhibits PTP" material and printing material performance, on the basis of its quality standard and testing method, and using these materials in gravure printing and coating process problems in the analysis of its causes.

1. A medicinal aluminum foil printing principle and material performance standards

1.1 aluminum foil printing works: the aluminum foil printing is conducted on special aluminum foil printing coating machinery, its principle is done through surface concave printing on the surface of the roller printing words or patterns, so called intaglio printing. It is outside the plate cylinder through plate picture and text, picture and text part in roller copper layer on the surface corrosion into ink hole or pit, the graphic part is the copper roller surface itself, plate roller rotation inside the ink tank, in each hole filled with thin ink, ink roller rotating when they spin out from the surface of the ink tank above the excess ink by installed on the plate roller surface of scraping knife scrape, plate roller rotation, when in contact with aluminum foil surface elastic press the aluminum foil embossing roller to the printing plate roller, make the hole of the ink printing ink transferred to the surface of aluminum foil, aluminum foil is complete printing work. The main raw materials used in printing is medicinal aluminum foil, aluminum foil ink and solvent to material and aluminum foil coated with adhesive materials. The following respectively to introduce in simple.

1.2 medicinal aluminum foil material properties and physical mechanical strength test.

Medicinal aluminum foil is use for more than 99% purity aluminium after rolling, non-toxic tasteless, it has excellent electrical conductivity and shading performance, have high moisture resistance, resistance capability and smell of sex. Aluminum foil with high density of metal crystal structure, it can be completely cut off any gas, steam, and the light, and therefore the most effective drugs, in almost all the requirements in the modern packaging not pervious to light or high barrier composite materials adopt aluminum foil as the barrier layer, pharmaceutical packaging, in particular, the physical and mechanical properties of the aluminum foil request for break attack strength should be greater than 90 k p. A, tensile strength of 98 m p a, thickness of 0.02 mm, surface clean and smooth without wrinkles, indentation, damage. No piece fluorescent material, diameter greater than 0.3 mm pinhole per square meters less than 1 a, surface wet tension not less than 32. (1) aluminum foil break attack strength determination: aluminium foil with the attack strength meter rag in finished products take 40 mm x 40 mm sample three pieces, each piece of cracks in the instrument, open the oil pump, depending on the instructions numerical pressure gauge in the attack strength is not lower than 90 k p a. (2) the degree of pinhole detection: use 800 mm * 600 mm * 600 mm or appropriate volume of wooden box, wooden box installed within 30 w fluorescent lamp, the cases on a piece of glass lining black paper and leave 400 x 250 mm space to check for aluminum foil pinhole. In aluminum foil products of 400 mm, 250 mm sample 10 by zhang on the pinhole examination table, check the pinhole in the dark place, whether accord with a standard. (3) aluminum foil determination of fluorescent material, using a 254 mm and 365 mm wavelength of ultraviolet analyzer. In aluminum foil products take 100 mm x 100 mm five line samples, shall be within the above wavelengths respectively to observe the fluorescence plate shaped. Tensile strength of the aluminum foil is in automatic tension test machine, taking a certain size of aluminum foil sample, the sample clamp up and down of the tester, respectively, to start the tensile testing machine, and record test data and standard control whether accord with a standard to ask.

1.3 aluminum foil ink, solvent to material properties and detection methods: (1) the composition of aluminum foil ink: mainly by the pigments, filling material, synthetic resin and solvent composition. (2) the quality of aluminum foil ink standard: color: should with standard color sample approximation (visual) sample, tinting strength, compared with the standard sample for 95-110%. Fineness: 25 microns or less. Viscosity: under the condition of 25 ℃ with 4 cups of 25-70 - s. (3) ink solvent performance: refers to the solvent used in the process of printing and coating its main representative: aromatic hydrocarbons of xylene (C 6 H 4 (OH) 3 (2) is made by distilling coal tar light oil part or light catalytic reforming gasoline by fractional distillation or by toluene disproportionation and made, is colorless transparent liquid, volatile aroma, toxic, insoluble in water. Representatives of ketone solvents for acetone (CH 3 COCH 3) is a colorless, volatile and flammable liquid, melting point 94.6 ° boiling point 56.5 ° ~ 20 ° flash point chemical properties more lively, explosion limit of 2.55-12.8% (volume).

Ester solvent is ethyl acetate (CH 3 COOC 2 H 5), also known as ethyl acetate, colorless, flammable liquid with fruit aroma, is made up of acetic acid with ethanol in the presence of sulfuric acid made by distillation after heating, melting point 83.6 ° boiling point 77.1 °, easy ignition, slightly soluble in water, explosion limit of 7.2 to 11.2%. Five solvents detection: water content must not exceed 0.2% of the solvent, the purity is not less than 99%. Control methods: spectrometer, gas phase with nitrogen as the carrier, thermal conductivity cell detector, make a set of different concentrations of solvent peak, peak height and the effect on concentration, working curve, and then under the same conditions for each batch of solvent sampling accordingly peak height, concentration. Specific detection methods: gas chromatograph, with nitrogen as the carrier, thermal conductivity cell detector, make a set of different concentrations of solvent peak, peak height and the effect on concentration, working curve, and then under the same conditions for each batch of solvent sampling accordingly peak height, concentration. Specific detection methods: gas chromatography, the gasification chamber temperature 250 ℃ measure the room temperature is 200 ℃, column temperature 200 ℃ with polymer porous spheres as column packing. Distillation of chemically purified solvent analysis reagent. Use has been purified of solvent and water mixture moisture content of 0.02%, 0.05%, 0.1%, 0.15%, 0.1% of the standard solvent. Sample quantity 0.1 ml sample, under a certain bridge current and attenuation, get water response peak, to height of the water concentration mapping, working curve. With each batch of raw material sampling, in same conditions, the same sample, with peak height in the corresponding concentrations compared with standard working curve. Every boot detection must work curve, whether conditions like once upon a time, also makes the purity of 100%, 99.8%, 99.5%, 99.2%, 99.5% concentration of sample is 0.1 ml into the quantity, be detected peak height of diluent, to peak high concentration mapping, get work curve, then the sample confirmed by peak height, according to the working curve obtained corresponding concentrations.

1.4 the aluminum foil adhesive properties and testing; Currently used adhesives for two-component polyurethane adhesive, for the Lord agent by contains lots of active hydrogen, such as hydroxyl amino composition, and how isocyanate curing agent is a compound, when the isocyanate curing agent molecules of the base and the main agent contact with active hydrogen, it will automatically addition reaction, generate carbamic acid ester structure, make the main agent and curing agent after the combination of molecular weight multiplied, even with the three-dimensional structure of branched chain structure generated as crosslinking products, high and low temperature resistance, high sticky relay etc. In the isocyanate curing agent (NCO) is a lively group 1 should sex, it besides can react with hydrogen molecules of the main agent and lively, also stay with with is lively hydrogen reaction of the glue material surface material molecules, and to generate chemical bond, the adhesive molecules and bridge role with aluminum foil PVC material at the same time, have a strong adhesive force. Adhesive main indicators measure: (1) solid content determination method: adhesive 5 grams of beaker, beaker in 110 ℃ oven dry 2 hours after weighing, the solid content of 5 g = dry film weight/x 100%. (2) adhesive viscosity measurement, the viscosity of the 25 ℃ is measured by rotary viscometer. Method is: under the condition of 25 ℃, temperature more than 0.5 hours the sample of the glue, according to provide the glue viscosity, viscometer is used to inspect. (3) the acidity according to GB/T1458-83 glass telegraph acidity meter is used to test, precision test paper test the PH value is also available.

2. The main quality problems of medicinal aluminum foil printing easy and analysis

2.1 medicinal aluminum foil printing appearance quality requirements (1) aluminum foil printing surface color bright, uniform, fold right color bright, inky smooth, imprinting edge is bright and clean. (2) printing: color fastness with transparent tape adhesive ink discoloration. (3) design text, line is clear, do not complete the imperfect deformation. (3) design text, line is clear, do not complete the imperfect deformation. 5 printing anilox rich layers, points clear. 5) printing neat appearance, have no obvious smudgy knife silk after 6 managers eventually change detection and the color deviation and density and the batch and poor indicators meet every requirement.

Disability: 2.2 aluminum foil print or design line cause analysis: (1) ink drying too fast, causing dryness. (2) too much wind hot affect printing roller concave surface drying. (3) the thread plate corrosion, less ink adhesion 5 scraping knife on the printing roller and embossing point distance too far. 5. The speed is too slow.

2.3 aluminum foil printing surface colored line (line) : root cause analysis: (1) scraping blade against the printing roller with rigid particles, impurities must be removed. If not fixed lines must sharpen or knife can change. (2) such as fixed lines, printing roller network with embedded hard impurities, must stop to remove. (3) started using the new roller, generally find fixed line mark because of the printing roller coated with aluminium by sanding later or retouching, eye of a needle. 4. Ink resin and paint was fine grinding, can also cause a line mark, must be removed with wire mesh filter. (5) blade Angle and position must be adjusted appropriate, hardness.