Development and application of the most environmen

2022-08-01
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Development and application of environment-friendly aluminum foil Polish

aluminum foil for packaging and printing (usually 0.2mm ~ 0.25mm hard aluminum foil and 0.07mm ~ 0.09mm soft aluminum foil) polish, also known as gloss and op protector. This paper mainly describes and introduces the material composition, formula design and application results of five varieties of environment-friendly glazing oil, which are fully made of domestic raw materials and belong to three types: normal temperature curing, high temperature curing and light curing

main task of aluminum foil varnish

the main task of aluminum foil varnish is to coat a protective layer on the semi-finished products of fine packaging printing that have completed all single printing or multi-color overprint. Its purpose is to further promote the surface gloss, beauty, acid and alkali resistance of packaging and printing products, and protect the printed graphic ink film. It not only increases the surface hardness of printed products, but also has certain flexibility. It can also improve the genuine rate of packaging and printing, and enhance the high added value of commodity packaging

from the use of aluminum foil varnish, we already know its main task. However, in the scope of application, people only use room temperature curing varnish for food packaging, especially in the recent three years, the popular beer sealing (top) packaging logo is more colorful. Generally, the glazing oil with high temperature resistance of 121 ~ 160 ℃ is used for cooking beverage cans, cigarette packs and drug packages

with the implementation of the national standard for drug packaging containers (materials) up to now (june1,2004), the traditional test basis GB has only five items: specification, volatile matter, difference in adhesive coating amount, heat sealing strength and heat resistance of protective layer, which has begun to be replaced by YBB (general rules for composite films and bags for drug packaging). This not only marks that China's packaging products can meet the performance requirements of bearings, especially the integration of pharmaceutical packaging products with international standards, but also marks the end of the traditional glazing products. The advent of environmental friendly aluminum foil glazing oil marks the beginning of new glazing products. The product development basis is as follows:

firstly: (1) identify the infrared spectrum; (2) Appearance; (3) Barrier performance (water vapor and oxygen); (4) Mechanical properties; (5) Heat sealing strength of composite bag (double layer and multi-layer); (6) Solvent residue; (7) Pressure resistance of bags (three side sealed bags and other bags); (8) Drop performance of bag (total mass of bag and contents and drop height); (9) Dissolution test: ① heavy metals; ② Readily oxidizable; ③ Nonvolatile matter; (10) Microbial limit (general composite membrane and bag; external drug composite membrane and bag, etc.) (11) abnormal toxicity. Therefore, it brings difficulties in design and processing.

second, YBB stipulates that 1) working environment temperature: ⑴ 5 ℃ to 40 ℃ (1) composite film refers to the film formed by the combination of various plastics and paper, metal or other plastics through adhesives, and its thickness is generally no more than 0.25mm; (2) Composite bag is a bag made of composite film by heat sealing. According to the bag making form, it can be divided into three side sealed bag, middle sealed bag, organ bag, self-supporting bag, zipper bag, etc. Moreover, the classification, barrier performance, mechanical performance, drop performance, microbial limit index, size deviation, etc. of the composite membrane are clearly specified. Focusing on environmental protection and connecting with the international market, in addition to physical measurement, the author adds the measurement of physical and chemical indicators. At the same time, since the total solvent residue was 30mg/m2 in the past, it is now changed to 10mg/m2 and the benzene residue limit is 3.0mg/m2. When the newly developed information solution (0.01mol/l) of sodium thiosulfate titration manufacturing/forming process is used to titrate to the near end point, 0.25ml of starch indicator solution is added, and the titration is continued to be colorless. In addition, the blank solution is taken for the same operation, and the difference between the two consumption of titrant shall not exceed the harsh limit of 1.5ml. In addition, the varnish can not change color, fade, fade or side light (due to heat and light, high softening point and conductivity) for 10 seconds at ℃. At the same time, it shall also meet the following technical requirements: (1) good color retention performance, no migration, yellowing, discoloration or falling of ink film after drying at a certain temperature; (2) It has certain brightness and firmness, and the adhesive tape will not fall off; (3) It shall have certain affinity when contacting with white printing ink or color ink and base oil; (4) High solid content, low viscosity, high transparency, especially good leveling smoothness; (5) After the Polish film is formed, it can withstand die cutting without hurting the knife, and can withstand mechanical impact such as flower and punching

basic composition of aluminum foil glazing oil

the basic composition of environmental friendly aluminum foil packaging glazing oil is: resin, solvent, filler and auxiliary. At present, the normal temperature aluminum foil packaging varnish system is mainly composed of thermoplastic resin, while the general high-temperature (℃) aluminum foil varnish system uses thermoplastic resin with a small amount of thermosetting resin or amphoteric resin, but the high-temperature (℃) aluminum foil packaging varnish system is composed of thermosetting resin and amphoteric resin. Its resins include acrylic resin, nitrocellulose, polyamide resin, natural rosin modified resin, phenolic resin, silicone resin, polyketone resin, amino resin, etc. The proportion of solvent is mainly alcohol, ester and ketone, supplemented by benzene. Additives include leveling agent, smoothing agent, light stabilizer and heat stabilizer

formula example of aluminum foil polishing oil:

high temperature resistant aluminum foil polishing oil (formula I) test report

notes: 1 The product is produced and used at 160 ℃ and 200 ℃ respectively (see Table 1 for batch coating), of which 2 is the comprehensive record)

2. Place: Henan Kaidi medicine bag material Co., Ltd.

3 Time: the morning of june6,2004 (the same test date)

4. Test basis: GB

5. The aluminum foil adopts 0.024 140mm plain aluminum foil (PTP)

6. Inspection records of medicinal aluminum foil (see Table 1)

table I pharmaceutical test record

1 Determination of volatile matter

take two pieces of 100mm

index: 4mg/0.02m2

weight before drying (mg) 1109.30

weight after drying (mg) 1109.30

volatile matter (mg/0.02m2) the measurement result is 0.20 and it is evaluated as qualified

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