Technical Problems and Solutions of Steel Drum Production Line 3

Sixth, on the volume size of the problem with technology package
With the development of market economy , consumers are increasingly demanding high quality steel drums manufacturing equipment. To reduce costs, the trend of thin steel drums has become increasingly clear that recently many companies reflect user requirements 200 l drums using 0.6 ~ 0.8mm steel manufacturing more and more, so there is a lot of contradictions . As process geometries did not receive timely changes , resulting in curling difficult to guarantee quality . And many enterprises and technical personnel, after the material thinning process dimensions do not fully understand the disharmony , mistakenly believe that simply changing seaming rollers groove dimensions can be solved , resulting in wasted manpower and resources, the result is not satisfactory. In this paper, the current domestic cooperage industry to discuss common problems , in order to pay attention to.
A seaming process and the relationship between materials
Seaming process exactly how many layers can roll ? Some people think that the more and more, That's true ! Crimping more layers , the higher the intensity , the better the sealing effect . However, is not able to achieve ten layers , twenty layers seaming it ?Here we mention the cost there is a quality problem, in fact , it is not able to achieve .Even roller groove design to better, but also can not be achieved , and why ?
( 1 ) Raw materials restriction drums
We produce steel drums , requiring a lower carbon content material , plastic is better .Because this is a very good processing properties , welding , stamping, bulging are easy to ensure quality. But curling is not the same as curling roller slot size can not change with the crimping process , crimping force should be gradually passed through the peripheral material to curling center to roll into the center . The plasticity of the material as possible, the more difficult the transmission of force . We can imagine that if the material is spring steel drums , like clockwork , this law the same materials, not to mention the volume ten layers , probably 20th floor is also very easy as it elasticity and rigidity, through the power of the external seaming easily spread to center. But this is impossible , because the material is flexible, so that the end of the seaming seaming force disappears in the case , it is easy and rebound back to the original state, that is to return to the beginning of seaming look. Such is clearly not what we need . Therefore , we can not use high resilient material . For now used to make drums of the material world , China's most rigid material , so the quality is difficult to guarantee . But no more than seven layers of curling . According to foreign experts in research, drums curling layers no more than seven, apparently seaming force transmission is less than so far.
( 2 ) drums seaming process constraints
For now the world's most advanced seaming process are also similar , nothing less than the crimping roller groove changes and seaming speed difference. This process is the most economical way for mass production , but also the quality and lowest cost approach. If you do not care about them , there may be better ways to make seaming force travels farther , so curling up seven more. But for drums this product , it can do a good seven curling had enough , if the current seaming quality is bad, it would have to look for other aspects of the problem.
2, the process size and curling layers of relationships
In fact, this is a simple question , previously explored a lot of people , where I do not want to come through the boring theoretical description . We all know that to volume seven , there should be enough volume seven things. That barrel bottom side of the flange width and barrel body dimensions must be adequate. Because the thickness of the material have been identified in the case , process undersize , crimping groove volume no matter how good it is impossible to seven . This means that it is not the size of the bigger the better technology ? Definitely not ! Imagine curling can only roll to seven, the excess material you want to go there ? Either increase the size curling , curling results may reach seven, but a large internal voids ; either excess material squeeze rollers , causing iron tongue . In short , curling is not guarantee of quality .Therefore, the curling process must determine a good size , not more nor less , so is the best.
3 , steel drum size and dimensions of the relationship curling process
Here I want to say is : drums size and hemming process size does not matter ! So why write this topic , because there are many companies that friends , drums larger ( mean diameter ) larger barrel drums and flanging bottom edge width greater will , it is wrong , it that's why drums thin curling after the main reason for the poor quality ! As already mentioned, are not repeated here , I just emphasize that if you change the material thickness , and to get the best seaming results, we must change the process dimensions . Curling process because a reasonable size and the thickness of the material is only relevant !
4 , to consider multiple factors to determine crimping method
Often things are always much as people would like , cooperage business users are now experiencing is really strange. In fact, having said that, it is these tough users, we have the cooperage industry. User is our god , and his need is our voluntary . Take our 200-liter steel drums for instance, are based on many years ago 1.25mm material, some users may now use 1.0mm, some to 0.8mm, there are still people to 0.6mm material , cooperage plants to eat, do not work.
However, the problem came out, thin materials , not to mention the difficulty of manufacturing processes , this one alone is enough seaming annoying it. Because the material thin , they need to roll into a seven-story , apparently large size of the original process , to get a good seaming quality, does not change the process size is unattainable. If the material with 1.0mm 0.8mm steel drum manufacturing process dimensions , this problem is not yet clear , sometimes under false pretenses can also, although the quality is not very good , the total can be decent. But some companies use the original dimensions to manufacturing processes 1.25mm 0.6mm steel drums , contradiction is very obvious, is not resolved to die .
Generally, companies do not want to change cooperage curling process dimensions , because changing the process size , it means re-opening of a barrel bottom mold flange dimensions touches easy to solve, a mold can be substantial costs , If the batch is not the case , who is not willing to do it.
The current domestic actual situation , the solution is only one , is to change the level of the original arc curling curling . Because the material thin, relatively large size of the bucket bottom craft , curling sure a lot of voids inside , quality is difficult to guarantee .To get volume was real curling , do not want to change the mold , flatten the crimp is the best way . Domestic production of 0.6 ~ 0.8mm 200-liter steel drums manufacturers , most of all into a flat curling , including thin-walled inner tapered barrels are like this . Of course, this is only an expedient measure, if the production of thin-walled barrel is large enough ( which is the direction of development ) , to open a barrel bottom mold should be the best choice.
Say this is what I like to teach others how to improvise or ways to fool people , in fact, cooperage industry people know that sometimes there is no way to do, there is a Benbanfa can settle things can be said that a good way . For most small businesses , the product is all kinds of complicated anticipated. In order to capture market pathetic , win a bowl of food to eat , what kind of barrels are willing to do, so it was a more contradictory . Several large domestic cooperage factory, doing many years of a single product, reluctant handyman barrels filled type of SME those markets became cooperage industry fatigues and supporting role.
But no matter how dry , the mind must be clear , most SMEs tend to exercise technical personnel, because their problems are really too much, which I fully understood. So, there are many companies in the technical staff after changing material thickness drums , did not realize the size of inappropriate technology , but also in other aspects blindly to find the problem , and this is no contradiction to seize the intersection , and ultimately have to less than ideal results .
Seven , on the requirements of construction and sealants
1 , wet glue and adhesive problems .
2 , steel drums seaming seal packing , commonly known as sealants, when the top and bottom steel drum barrel body seaming , the fill cracks in the seal crimping . Because steel drum roll to win the title , curling site has a certain rigidity rebound , rebound to make the original volume appeared tight curling gap . So, with the seal crimping gap fillers , can effectively improve the ability of anti-leakage steel drums .
Production and use of steel drums for sealing filler have the following requirements:
1 . Compatibility. Since drums very versatile , dressed variety of goods , it requires sealing filler material filled with a variety of a certain compatibility. If a seal packing material and filled with incompatible , it may produce a chemical reaction , etching , thereby undermining the packing sealing performance, so filled with material deterioration or modified .
2 . High temperature stability . Since most manufacturers of steel drums cooperage coating oven drying processes are used , some as high furnace temperature about 200 ℃ , steel drum surface temperature higher , at this temperature, flow seal packing thinning or deterioration Jiaohu would affect the sealing performance .
3 . Higher solid component content . Since it is a sealed packing , unlike the pure adhesive glue , if the solid component content is low, the volume was reduced after drying , can not effectively fill the gap , thus affecting its sealing.
4 . Good adhesive properties. Most cooperage factory production process has bottom of the barrel , the top pre-roll spray processes. If the bottom of the barrel roof with plastic precurl adhesive force is not strong , then curling the beginning, the top and bottom of the barrel barrels are produced relative sliding flange , the pre-roll spray glue rub off , and sometimes fall outside sometimes fall into the bucket. Not only affect the sealing performance , and fall into the barrel of the rubber block also affects the internal cleaning of steel drums .
5 . Better flexibility . In steel drums crimping process due to mechanical forces , making curling very tight package , the gap to the minimum position . But after seaming , crimping the crimp rigidity springback relaxed some of the reasons that , the gap is relatively large . If the gland packing is no better flexibility , you can not adapt to this change. In addition, from a technical perspective , the sealing bead fillers should have some flexibility within the compressed elastic stretch to make itself better sealing performance .
6 . Better workability . The so-called construction performance , that can be easy to glue , gluing, drying process of implementation , the viscosity to meet the requirements , do not have obvious particles, agglomeration, too thin or precipitation phenomena .Further, since the country consistent weather conditions , require it to have a weather resistance, not because of cold and curdle , can not fail due to heat .

There are several issues we must pay attention : ① barrels used in food packaging , the sealant should be non-toxic and does not react with food . For other uses of drums , a non-toxic sealant is not important ; ② water-based glue rust problems in the construction methods can take some improvements, such as to prevent splashing and timely drying ; ③ sealant solvent resistance are not absolute , as long as the relative stability of the filled material should be suitable. Foreign divided into many types of the sealant , a different type of sealant used for this purpose .