Mainly used forDrinks, foodsoy sauce pickles, honeyDry Fruits、Edible oil, agricultural and veterinary drugs and other liquid or solid disposable plastic packaging containers.Plastic bottles are not easy to break, low cost, high transparency, food grade raw materials and so on.
currentworld economyIn the change, domesticindustrial structureIt is also in the constant upgrading stage.In the currentIndustrial upgradingIn the process, some lowadded valueOur enterprises are confronted with all kinds of business difficulties, unprecedented challenges and difficulties.Let's talk about the plastic bottle enterprises in the transformation storm.
For plastic bottles, there are various problems at present.Let's make a careful analysis.First, plastic bottles belong toLabor intensive industry, currentLabor costAs for plastic bottle enterprises,Labor costHas become a huge pressure.secondly,raw materialThe price keeps rising. Due to the rising costs in the market, the raw materials have risen significantly, which has caused another layer of pressure to the plastic bottle enterprises.Again, withEuropean debt crisisAs well as the weakness of the world economy, the foreign trade orders of plastic bottles have gradually declined, and many foreign trade enterprises have moved to wardomestic marketThis has brought greater pressure to the already competitive domestic plastic bottle market,price warThe profits of enterprises are getting lower and lower.
For plastic bottle manufacturers, under the current pressure, they should take the road of industrial upgradingPlastic packagingfieldTake the road of innovationAnd strive to improve the added value of plastic bottles.From plastic bottle design, production and sales of all aspects of continuous improvement.
Material Science
Plastic bottles are not easy to break, low cost, high transparency, food grade raw materials and so on.
useplasticBe careful not to touch vinegarCleaning agentAvoid direct sunlight, high temperature, etcchemical reaction。In addition, you are purchasingPlastic tableware Plastic products with PE (polyethylene) or PP (polypropylene) marks, few decorative patterns, colorless and tasteless, and smooth surface shall be selected.
Production method
manufacturepolyethyleneThere are many ways to do this, the most common of which is at 200~300 ℃ and 1000~2000 ℃pressureUnder pressureethylenePolymerized.In polyethylene, no other substances are mixed.Polyethylene made in this waydensityIt is low, soft and has high stability for sunlight, air, moisture and chemical reagents, so it is unnecessary to add stabilizer and plasticizer, which are mostly toxic or highly toxic.
Product features
Plastic bottles are easy to carry, not afraid of falling, acid and alkali resistant, easy to produce, and also conducive to recycling.
problem
(1) When designing the extrusion plastic bottle, if the material isHigh density polyethyleneOr polypropylene, plastic bottlecross sectionShould be rectangular or oval, for materiallow density polyethyleneOr other flexible plastic bottles, whose cross section should be round.This is convenientContentsExtrude from the plastic bottle.The plastic parts used together with the plastic bottle mouth are mainly bottle caps and sealers.The design of plastic bottle mouth should focus on how to make the plastic bottle mouth better match with the cap and sealer.The bottom of the plastic bottle is a plastic bottlemechanical property The weak part of.Therefore, the bottom of the plastic bottle is generally designed to be concave;The corners and recesses of plastic bottles shall be made with large arc transition.To facilitate the stacking of plastic bottlesStackingStability, the bottom of the plastic bottle should be designed with an inner groove.
(2) When the surface of the plastic bottle is labeled, the labeling surface should be flat.A "frame" can be designed on the surface of the plastic bottle so that the label can be positioned accurately without movement.During blow molding,ParisonThe first contact part of inflation always tends to harden first.Therefore, the wall thickness of this part is also larger.The edge and corner are the last contact part of parison inflation, and the wall thickness of this part is small.Therefore, the edges and corners of plastic bottles should be designed as rounded corners.Change the surface shape of the plastic bottle, for example, the middle of the plastic bottle is relatively thin, and increase the surface shape of the plastic bottleCircumferentialGrooves or ribs can improve the rigidity and bending resistance of plastic bottles.Longitudinal groove orStiffener, which can eliminate the deviation, sagging orDeformation phenomenon。
(3) Plastic bottlePrint side, is the most focused part of consumers.The printing surface shall be flat and continuous;If the plastic bottle contains a handle, a groove, a reinforcing rib and other structures, attention should be paid not to inconvenience the printing operation during the design.Oval plastic bottle with high rigidity, butManufacturing expensesHigher.Therefore, in order to ensure the rigidity of plastic bottles, in addition to selecting materials with high rigidityAppearance design，reinforced plastic The rigidity and load resistance strength of the bottle.
Plastic bottle
(4) Because most plastics haveNotchsusceptibilityThe plastic bottle is easy to crack and crack at the sharp corner, the root of the thread at the mouth, the neck and other parts, so these parts should be designed as rounded corners.For the transfer part of the rectangular plastic bottle, it needs to support most of the load of the plastic bottle, so locally increasing the wall thickness at this part is also conducive to improving the rigidity and load resistance strength of the plastic bottle.
Health Notice
The main raw materials for making beverage bottles arepolypropylenePlastic, non-toxic and harmless, used for packagingSodacolaType B beverage has no adverse effect on human body;However, the plastic bottle still contains a small amount ofethyleneMonomer, if wine, vinegar, etc. are stored for a long timeLiposolubilityorganic compound, chemical reaction will occur.Eating food polluted by ethylene for a long time will make peopledizzy、headache, nauseaAnorexia、Memory declineAnd other serious cases may lead toanemia。In addition, use beverage bottles to contain wine, vinegar, etc., and the bottles will be exposed to oxygenultraviolet raysThe wine and vinegar stored in the bottle for a long time will deteriorate due to aging, releasing more ethylene monomer.For the accidental injury event caused by not containing other liquids in the beverage bottle, it is recommended that the beverage company indicate the following warnings on the bottle packaging:
Drink bottles should not be recycled or filled with hot water.
Use: Heat resistant to 70 ℃, only suitable for warm drinks or frozen drinks. It is easy to deform when filled with high temperature liquid or heated, and harmful substances may melt out.Moreover, scientists found that after 10 months of use, No. 1 plastic may releaseCarcinogenDEHP，Toxic to testes.
The cleaning is not complete, and it is recommended not to recycle.
Use: It can be reused after careful cleaning, but these containers are usually difficult to clean, leaving the original cleaning supplies and becoming bacterialhotbedIt is better not to recycle.
Do not wrap the plastic wrap on the food surfaceMicrowave OvenHeat.
use:Heat resistanceNot strong. Generally, the qualified PE fresh-keeping film will melt when the temperature exceeds 110 ℃, leaving some plastic preparations that cannot be decomposed by the human body.In addition, if the food is wrapped with plastic wrap for heating, the oil in the food can easily transform theHazardous substancesDissolve it out.Therefore, when food is put into the microwave oven, the wrapped fresh-keeping film should be removed first.
"No. 5" PP
Microwave oven lunch box
Remove the cover when putting it into the microwave oven.
Use: can be put into the microwave ovenThe plastic box, can be reused after careful cleaning.Special attention should be paid to some microwave oven lunch boxes. The box body is indeed made of No. 5 PP, but the box cover is made of No. 1 PE. Since PE cannot withstand high temperature, it cannot be put into the microwave oven together with the box body.To be on the safe side, remove the cover of the container before putting it into the microwave oven.
Use: It is heat-resistant and cold resistant, but cannot be put into the microwave oven to avoid releasing chemicals due to high temperature.It cannot be used to contain strong acids (such asOrange juice）, strongAlkaline substance, because it will be broken down to be bad for human bodypolystyrene, easy to cause cancer.Therefore, you should try to avoid packing hot food in fast food boxes.
"No.7" PC
Other categories: kettle, cup, milk bottle
PC glue meets bisphenol A
Use: A material widely used, especially in milk bottles, because it containsBisphenol AIt is controversial.City University of Hong KongLin Hanhua, associate professor of the Department of Biology and Chemistry, said that in theory, as long asPCIn the process of,Bisphenol A100% conversion to plastic structure means that the product has no bisphenol A, let alone release.However, if a small amount of bisphenol A is not converted into the plastic structure of PC, it may be released into food or drinks.Therefore, it is important to be careful when using this plastic container.
The higher the temperature is, the more bisphenol A is released and the faster the speed is.Therefore, PC water bottles should not be used to hold hot water to avoid increasing the release rate and concentration of bisphenol A (if any).If your kettle is numbered 7, the following methods can reduce the risk:
● Not useddishwasherClean the kettle with the bowl dryer.
● Do not heat when using.
● Keep the kettle out of direct sunlight.
● Before the first use, useBaking Soda Clean with warm water and dry naturally at room temperature.Because bisphenol A will release more in the first use and long-term use.
● If there is any falling or damage to the container, it is recommended to stop using it, because if there are slight pits on the surface of plastic products, it is easy to hide bacteria.
● Avoid repeated use of aged plastic appliances.
Waste plastics
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As you know, there are three kinds of plastic products used in food packaging:polyvinyl chloride, polyethylene, polystyrene.It is used to hold clothes in a short timeEdible oil, Yeshuman health It is unimpeded.However, using them to contain edible oil for a long time will pollute food and cause harm to human body.
This is because this kind ofPacking bottleIt has the characteristics of high transparency and easy aging. It will produce strong odor under the action of oxygen, ozone and ultraviolet rays in the air. In addition, the polymer itself is aging. If it is used for long-term storage of cooking oil, it is easy to deteriorate these edible products.
In addition, polyvinyl chlorideThe element chloroethylene in is not only toxic, but also easy to decompose in acids and oils, resulting in the release of highly toxicHydrogen chlorideAnd chlorine, added in PVCPlasticizer, such as benzoic acid esters, are toxic, and lead, cadmium andOrganotinIt's all toxic chemistrymaterialIt is highly toxic and easy to dissolve in oil.Plastic polystyrene Although it is a low toxic substance, its components are styrene and volatile componentsethylbenzene、CumeneBoth are toxic and very soluble in grease.Plastic polyethylene itself is not toxic.However, it can be decomposed and separated after contacting with oilLow molecular compoundThese low molecular elements will be toxic if dissolved in oil.
Forming principle
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The plastic bottle is made ofModel gunAfter a certain temperature and pressureBlow molding, can be formed by bottle preform processing, or can be directly formed byInjection blow moldingIt is processed by one machine.
Bottle material development
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The process of manufacturing barrier plastic bottles using coating technology has shown a downward trend, and there have been Krones AG, Tetra PakIllinois）Start to reduce production scale.Krones andCoca Cola CompanyWe jointly developed the BestPET technologySurface coatingcontainSilicon oxideCoating.A spokesman of the company claimed that due to the high cost and insufficient oxygen barrier performance, this technology has become outdated, and Tetra Pak has also terminated its application inPET bottleGlaskin on the inner wallsilicon dioxideplasmaResearch work on coating system.
In addition, Italian SIPA company has developed a new barrier dip coating material for PEN bottlesTrade nameSmart Coattechnological processYes: After the bottle is obtained by blow molding, it goes through the dip coating process, and then it is put into the bottle immediatelyinfraredThe bottle is dried quickly in the oven, and then coated for the second timeultraviolet radiationOne standard dipping device can handle about 12000 plastic bottles per hour.One of the application goals of this PET bottle is to fill carbonated drinks. According to the company's introduction, the dip coated PET bottle with a capacity of 0.5 liter for a single purpose isPackaged goodsOfShelf lifeIt can last up to one year, while the shelf life of goods without dipped PET bottles is only 7 weeks.
Innovative Plastic Technology (AFT) has developed a patentedWater-basedFlow coating process can improve a special barrier propertyThermoplastic resinsystempreform OfOuter surfaceAfter coating, the resin will solidify after the preform passes the coating process, and the preform can be processed on standard processing equipment for the second timeStretch blow molding。APT claims that compared with uncoated PET bottles, this coating process hasCOHeskey is negotiating with APT to transfer technology to obtain the business license to manufacture this coating equipment. The design capacity of the equipment is to process 30000 preforms per hour.Li said.This technology has been purchased by a manufacturer and applied to the processing of non-alcoholic beverage packaging bottles.
GermanyAachenuniversityPlastic processingIKV has developed a plasma coating technology for the inner wall of plastic bottlesPECVD, transferred to Sidel, IKV has also developed a coating technology for the outer wall of plastic bottles, which uses a barrier coating of 20-150nm, similar to the inner wall coating process, and can improve the CO barrier performance of PET bottles by four timesproduction system The processing cycle of the device is 15 seconds. The development goal set by the researchers is to reduce the processing cycle to less than 10 seconds and apply more powerfulVacuum pump, and other improved modelsDetection device。
Crossing the Pacific
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David de Rothschild, a British explorer, has a new challenge, which is to sail a sailboat bound with 12000 discarded plastic bottles to crossthe pacific oceanThe whole journey is more than 17000 kilometers.More than a month later, this plastic ship finally docked for the first time for replenishment.Depart from March 24San FranciscoAfter the port“Plastiki”No. has arrivedPacific Island CountriesKiribatiOfChristmas IslandThis is also the first time for the six crew members on board.Although it is bundled with waste plastic bottlesMeter longThe "Prestige" has proved its ability to fight against wind and waves.The ship is also equipped with severalPortable computer、Global Positioning SystemAnd satellite phones, and the power supply for them is from the shipSolar panelAnd twoSport bike。
We all know that waste plastic bottles can be recycled, but in what way?We are not very clear about this. Plastic bottles have a lot of use value after being recycled. Among them, plastic bottles can also be spun into yarn, which can be transformed intoClothing fabricIs it amazing?
Plastic is one of the great inventions of human beings, but it also becomes a troublesome source of garbage because it is difficult to degrade, and causes harm to the environment.actuallyWaste plasticsIt is not garbage. It can be turned into treasure through environmental protection technology.The main materials of plastic bottles are generally PP (polypropylene) and PET（Polyethylene terephthalate）The latter is one of the important raw materials for making clothing fabrics.
And based onBeijing Textile Science Research InstituteIt is very cool to wear this kind of clothes, because this kind of cloth has the function of "moisture absorption and quick drying", which enables consumers to wear environmentally friendly and comfortable clothes."OurCorporate philosophynamelyGreen and environmental protection, not only usingRenewable resourcesAs raw materials,Production processChina also strives to create emission free standards. "Mao Youjun said, "The traditional way of producing polyester in the world is chemical refining. After our technological innovation, the quality of our products has reached the standard of original products."
Instrument testing
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National professionals use the vertical pressure gauge of plastic bottles to test thecompressive strength, usingSealing testerCheck the sealing leakage strength.
