A kind of overlay film ironworking equipment
Technical field
The utility model relates to a kind of overlay film ironworking equipment, especially through high temperature chromium plating iron and plastic sheeting is carried out the compound equipment of heat.
Background technology
Mental package is the important component part of China packaging industry, and its output value accounts for 10% of the China packaging industry gross output value, is mainly industries such as food, can, beverage, grease, chemical industry, medicine, cultural goods and cosmetics the packing service is provided.Mainly contain various beverage cans, food product packets tinning/box, metal aerosol jar, gift jar, chemical materials jar/bucket or the like from the product form branch.Mainly contain aluminium pot and iron flask from packing material branch.
In China, most food packing metal can all is to use paint can at present, and this jar inner face also is that the surperficial used coating of direct contact food is base-material with the epoxy resin, and epoxy resin often contains harmful material bisphenol-A.There is very big harm in bisphenol-A to the human reproductive system, can cause that reproductive system dysplasia, women do sth. in advance sexal maturity, sperm quantity reduces and bring out the cancers relevant with hormone such as prostate cancer and breast cancer easily.If bisphenol-A gets into the women uterus, will be prone to cause the fetal disease variation, as being prone to suffer from diabetes and cancer.In addition, also possibly contain harmful substances such as melamine in the additive of coating that this paint can inner face uses.This shows that existing metal food packaging material are very big hidden danger for food security and health, must cause enough attention.
The manufacturing materials of the iron flask in the existing mental package jar mainly contains tinplate (sheet metal of electroplating surfaces with tin) and chromium plating iron (surface is tin plate not).For coating is coated to the metal surface; Need use a large amount of organic solvents in its processing technology; These organic solvents have part to be discharged into to cause in the atmosphere environmental pollution in process of production, and are jar inner in packing, though also have minimal residue through volatilization; Residual organic solvent finally can penetrate in the food and drink, and then is detrimental to health.
In addition, the used rustproof lacquer of paint can comprises primer, whiting and glazing paint, is main with acrylic acid and mylar.The printing ink that the outside printshop of paint can is used must with the supporting use of coating; Be performances such as the color that guarantees printing ink and adhesive force; Often add batchings such as curing agent, thickener, toner in this coating, be dissolved in and use in solvent and the diluent, these all can bring pollution to surrounding enviroment.Therefore, these all are the environmental issues that needs to be resolved hurrily.
Simultaneously,, cause the complex manufacturing of existing mental package jar owing to use a large amount of coating and other organic substance in the existing mental package jar production, the energy and high material consumption, production cost is high.
In order to overcome above technological drawback, in recent years, the another kind of method that goes up direct laminating material film at cold-reduced sheet (mostly being chromium plating iron) has appearred also.Normally in the steel plate upper and lower surfaces layer of plastic film of respectively fitting, the steel plate that posts film is called overlay film iron.Can reduce environmental issue greatly on this technical know-how, but have very high technical threshold.At present, domestic only have minority enterprise can produce overlay film iron, and only limit at low temperatures behind the gluing plastic sheeting and steel plate is compound, and used PUR main component is acrylic resin or other PUR.Because the fusing point of PURs such as acrylic resin is low, therefore the compound product of this mode can't be used the thermophilic digestion sterilization, and also there is certain toxicity in acrylic resin itself, therefore, in packings such as beverage, fruit juice, catsup jar, all can't use.
Summary of the invention
To complex manufacturing, the energy and high material consumption in the prior art, production cost is high, environmental pollution is serious; And human body is existed shortcomings such as healthy hidden danger; The utility model is through providing a kind of brand-new production equipment; Can thoroughly address the above problem, when improving the quality of products, reducing pollution, also can reduce production costs.The utility model is realized through following technical scheme:
A kind of overlay film ironworking process equipment; Comprise clearing and drying device, preheating device, film pressing device; The said cold rolling thin rolling steel plate of handling through chrome-faced is unreeled by the steel plate uncoiler; Be sent to clearing and drying device one by one through deflector roll and carry out cleaning-drying, get into preheating in the preheating device again, through film pressing device steel plate and plastic sheeting are carried out the compound press mold of elevated temperature heat again.
Preferably, said clearing and drying device comprises cleaning device and drying device, and said cleaning device comprises steel plate blown through compressed air and drench or/and the alkali lye rinse bath cleans that the pure water rinse bath cleans that said drying device uses oven drying.
Preferably, said compressed air uses pure air, and pressure is 1.5 ~ 5kg/cm2; Alkali lye in the said alkali lye rinse bath adopts 40 ~ 80 ℃ sodium hydroxide solution, and concentration is 0.1 ~ 5%; Said cleaning adds the ion exchange resin method with pure water employing counter-infiltration and prepares, and resistivity is 1 ~ 5M Ω cm, and temperature is 10 ~ 30 ℃.
Preferably, said steel plate surface temperature after the preheating device preheating reaches 120 ~ 270 ℃.
Preferably, also comprise cooling device or/and compound back drying device, the steel plate after said heat is compound gets into drying device and carries out drying after the cooling device cooling.
Preferably, said cooling device used medium uses pure water, and the temperature of said pure water is 12 ~ 35 ℃.
Preferably, said drying device uses electrothermal tube heat drying mode, and said baking temperature is 50 ~ 100 ℃.
Preferably, said preheating device comprises the experimental process preheating device.
Preferably, said sub-preheating device uses the electromagnetic induction heating roller, and the roll surface temperature of said electromagnetic induction heating roller is 120 ~ 270 ℃, and the said electromagnetic induction heating roller roll surface temperature difference is ± 1 ℃ ~ ± 2 ℃.
Preferably, said film pressing device comprises plastic sheeting unreeling machine and pressing film roller, and said pressing film roller is high temperature resistant rubber roll, and temperature resistant range is 120 ~ 250 ℃.
Preferably, some chill rolls are set around said pressing film roller, to the pressing film roller cooling, the temperature of said chill roll is 18 ~ 35 ℃, and the roll surface temperature difference of said chill roll is ± 2 ℃ ~ 5 ℃.
Preferably, also comprise dewater unit, said dewater unit is a dehydration roll.
Preferably, also comprise steaming plant, said steaming plant uses steam jet that steel plate is carried out boiling, and said boiling employing temperature is 120 ~ 160 ℃ a water vapour, and digestion time is 3 ~ 20 minutes.
Preferably, saidly after detecting, carry out rolling by winder through the steel plate behind the composite drying
By above-mentioned technical characterictic, can be implemented under the prerequisite that does not apply any glue plastic sheeting and the compound technical purpose of chromium plating iron, thereby avoid at the steel plate coating.And, can also realize that through the utility model the elevated temperature heat of steel plate and plastic sheeting is compound, realize the tight bubble-free good result of fitting.The utility model has following effectively effect at least:
1, has functions such as good antirust, decoration, heat insulation, damping, especially anti-punching press, corrosion-resistant;
2, surface pinholes is few, densification, and tensile strength is high;
3, production efficiency is high, and energy resource consumption and material consumption are low, so production cost is lower;
4, do not have organic solvent emission, it is residual also not have little molecule harmful substance, and production process and product be environmental protection more all.
Description of drawings
Through reading the detailed description of non-limiting example being done with reference to following accompanying drawing, it is more obvious that the other features, objects and advantages of the utility model will become:
Fig. 1 illustrates the sketch map of a kind of embodiment of the utility model overlay film ironworking equipment;
Fig. 2 illustrates the film pressing device sketch map of a kind of embodiment of the utility model;
Fig. 3 illustrates the cold water device sketch map of a kind of embodiment of the utility model;
Fig. 4 illustrates the boiling case sketch map of a kind of embodiment of the utility model.
Label declaration among the figure:
1 steel plate uncoiler;
2 compressed air blow and drench the chamber;
3 alkali lye rinse baths;
4 pure water rinse baths;
5 baking ovens;
6 preheating chambers;
7 electromagnetic induction heating rollers;
8 film pressing devices;
9 plastic sheeting unreeling machines;
10 chilling tanks;
11 dehydration rolls;
12 boiling cases;
13 drying machines;
14 detectors;
15 winders;
16 pressing film rollers;
17 chill rolls;
18 water circulating pumps;
19 heat exchangers;
20 steam jets.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:
Fig. 1 is the production line sketch map of a kind of embodiment of the utility model overlay film ironworking equipment.
Be elaborated below in conjunction with the whole process of production of accompanying drawing to the utility model.
Said to need the steel plate of processing be the cold rolling thin rolling steel plate (chromium plating iron) that chrome-faced is handled, and said to be used for compound plastic sheeting can be PP plastics (polypropylene), also can be PET plastics (polyester).
It at first is clearing and drying device.In Fig. 1; Need the cold rolling thin rolling steel plate of handling through chrome-faced (chromium plating iron) of processing after 1 uncoiling of steel plate uncoiler, (to it will be apparent to those skilled in the art that by the deflector roll transmission; Said steel plate is sent to each technological process by one or more deflector rolls after uncoiling; The number of said deflector roll is according to transmission direction, the transmission range decision of steel plate; This point is not the main points of the utility model, in following literal, is omitting) enter into compressed air and blow and drench chamber 2, said compressed air blows and drenches that working pressures are 1.5 ~ 5kg/cm in the chamber 2
2Pure air, through compressed air most floating dust on the steel plate is purged and to remove.Steel plate behind rough dusting enters in the alkali lye rinse bath 3; In the alkali lye rinse bath 3 is alkali lye; Alkali lye can be selected common NaOH, potassium hydroxide etc.; The temperature of alkali lye and concentration are selected according to the situation of surface of steel plate greasy dirt dust, and concentration can be between 0.1 ~ 5%, and to select according to the size of concentration of lye and surface of steel plate greasy dirt situation be the alkali lye of normal temperature attitude or through being heated to the alkali lye of uniform temperature.
In a kind of embodiment of the utility model, selection concentration is 3% sodium hydroxide solution, and temperature is set in 50 ℃.After the greasy dirt removal of alkali lye with the metal foil surface, get into pure water rinse bath 4 again, with pure water surface of steel plate is cleaned.The Reverse Osmosis Water Treatment Technology of cleaning used pure water employing routine adds the ion exchange resin treatment technology and prepares; Resistivity of water and temperature are set according to the surface of steel plate situation; Usually, resistivity can be selected between 1 ~ 5M Ω cm, and temperature is 10 ~ 30 ℃.Among a kind of embodiment of the utility model, selecting resistivity is 3 M Ω cm, and water temperature is controlled at 20 ℃.Steel plate after washing gets in the baking oven 5, through being placed on the infrared lamp water bake drying that surface of steel plate is residual in the baking oven 5.
Steel plate gets into preheating device behind cleaning-drying.Whether preheating device suitablely will determine film pressing device light plate thereafter and compound tight ness rating, firmness, the press mold of film whether to have bubble and stick up abnormal conditions such as skin surface of steel plate is temperature controlled, thus the quality of decision whole film covering iron product.Specific as follows:
Steel plate behind cleaning-drying enters into preheating in the preheating chamber 6.The preheating device of the utility model is one group of electromagnetic induction heating roller 7, and this also is one of key of the utility model.Select the electromagnetic induction heating roller that following several advantage is arranged: the one, can realize good temperature control effect, the temperature of surface of steel plate can be controlled evenly can accomplish accurate control again; The 2nd, higher heating-up temperature can be realized, thereby required steel plate of the utility model and the compound temperature requirement of film surface can be satisfied; The 3rd, can not influence pollution behind cleaning-drying steel plate and environment polluted.If use common warm-up mill,, in heating process, will certainly cause the leakage of heated oils like the heat-conducting oil heating roller; Pollute steel plate and environment, cause product can not be used for packaging for foodstuff, in addition; Common warm-up mill does not reach the required combined temp of the utility model yet, thereby causes compound failure.
In the utility model; Can be between 120 ~ 270 ℃ through surface of steel plate temperature after the preheating, concrete, according to required compound plastics variety and recombination velocity; Control and adjust the temperature of surface of steel plate; Further because the preheat temperature that will reach different, the number of employed electromagnetic induction heating roller 7 is also different.Usually, in order to realize good composite effect, need to use one group of electromagnetic induction heating roller.The temperature of each electromagnetic induction heating roller is all set separately and is controlled, and the heating-up temperature of operated by rotary motion electromagnetic induction heating roller in front is lower, raises gradually to the back, until reaching final needed preheat temperature.In an embodiment of the utility model, as PP plastics and chromium plating iron are compound, when recombination velocity was 100m/min, the temperature after the surface of steel plate preheating was set at 180 ~ 200 ℃, and the number of the electromagnetic induction heating roller that needs is 6.When recombination velocity was 130 ~ 140m/min, the preheat temperature of surface of steel plate was set near 220 ℃, heat and temperature requirements when needing this moment 8 electromagnetic induction heating rollers of configuration could satisfy compound press mold.
About the said electromagnetic induction heating roller in the warm-up phase, the applicant has applied for a plurality of patents, and its structure and operation principle repeat no more at this.
Steel plate gets into film pressing device after being preheating to design temperature.Film pressing device also is the key of the utility model.Like 8 among Fig. 2 is film pressing device.Said film pressing device 8 comprises plastic sheeting unreeling machine 9 and pressing film roller 16.Said pressing film roller 16 is resistant to elevated temperatures rubber roll.Because the surface of steel plate temperature after preheating is higher, therefore, the temperature resistant range of pressing film roller also will adapt with the surface of steel plate temperature.
Concrete press mold is following: ready two volume plastic sheetings through plastic sheeting unreeling machine 9 respectively from both direction with need compound steel plate near, the extruding through two pressing film rollers 16 fits together plastic sheeting and steel plate elevated temperature heat respectively.Certainly, if only need, then only need a plastic sheeting unreeling machine to provide plastic sheeting to get final product from a direction at laminated film of steel plate.In recombination process; Because the surface of steel plate temperature after preheating is very high; The temperature of pressing film roller 16 also can raise gradually; One side need be well compound to realize with surface of steel plate with the one side fusion of the compound plastic sheeting of steel plate, also will avoid the another side temperature of plastic sheeting unlikely too high on the other hand, cause compound failure to avoid the complete fusion of film.Therefore, in compound press mold, also need lower the temperature to pressing film roller 16.In an embodiment of the utility model, on the next door of 2 pressing film rollers 16 chill roll 17 is set respectively, a surface of 17 pairs of pressing film rollers 16 of said chill roll lowers the temperature, and prevents the one side fusion of plastic sheeting.In the present embodiment, preferably, the temperature of said chill roll 17 is set in 18 ~ 35 ℃, and the roll surface temperature difference is ± 2 ℃ and gets final product.According to production requirement, said chill roll 17 can be provided with one or more.
Behind press mold, realized the well compound of surface of steel plate and plastic sheeting.In order to realize the better bond effect of steel plate and plastic sheeting, among the embodiment of the utility model the device that the steel plate after compound is cooled off is provided also.The chilling tank 10 that is used to cool off as shown in Figure 3, this chilling tank 10 same pure water that use cool off, and in an embodiment of the utility model, water temperature is controlled at 12 ~ 35 ℃, with to carrying out quench cooled through high temperature and the compound steel plate of plastic sheeting fusion.Preferably, among embodiment of the utility model, water temperature is at 15 ~ 30 ℃.The result of quench cooled can realize the better bond effect to compound back overlay film iron product, makes plastic sheeting and the bond effect between the steel plate after compound better.
Said cooling device also comprises water circulating pump 18 and heat exchanger 19, and its effect is to keep the temperature in the chilling tank 10 to remain at design temperature.Concrete operation principle is: when the steel plate of heat was lowered the temperature through the chilling tank, the temperature of water rose in the tank.At this moment; Set according to the water temperature in the chilling tank; Through corresponding control system; Water circulating pump 18 is about to water in the chilling tank and is transported in the heat exchanger 19 and cools off, and after reaching design temperature, flow back in the chilling tank 10 through the control of control system again, thereby keeps water temperature in the chilling tank 10 all the time in the design temperature scope.
The steel plate of accomplishing pad pasting gets into and is chilled to about room temperature through chilling tank 10, promptly gets into follow-up dehydration, boiling, drying and detection etc.Specific as follows:
Through dehydration roll 11 the most water of surface of steel plate is removed through dehydration, entered into again in the boiling case 12.Like Fig. 4 is the sketch map of boiling case.20 is steam jet among the figure.The effect of boiling is that the overlay film iron product is carried out sterilizing, to adapt to the hygienic requirements of packaged food, beverage.Among the embodiment of the utility model, serviceability temperature is that 120 ~ 160 ℃ steam carries out boiling to the steel plate behind overlay film.The height of boiling temperature is selected according to the kind difference of plastic sheeting, among a kind of embodiment that the utility model provides, with PP film and chromium plating iron carry out compound after, the temperature that boiling needs is 120 ~ 130 ℃.Behind retort sterilization, with the steel plate bake drying, said drying machine can adopt the electrothermal tube mode of heating with the oven dry of surface of steel plate moisture through drying machine 13, and the baking temperature scope is 50 ~ 100 ℃.Said drying machine still adopts other mode of heating, repeats no more at this.Among the embodiment of the utility model, the baking temperature that compound PP film needs under the speed of 100m/min is 60 ~ 65 ℃.
The product of dry oven dry passes through detector 14 after detecting automatically, and notes the product quality details, with the final products rolling, accomplishes the production of final overlay film iron product by winder 14.
More than the specific embodiment of the utility model is described.Need to prove that the utility model is not limited to above-mentioned specific implementations, those skilled in the art can make various distortion or modification within the scope of the claims, and this does not influence the flesh and blood of the utility model.