Soft packaging solvent-free glue composite precautions.

With the country's environmental protection more and more strict, at the same time, soft packaging manufacturers also from the cost point of view, in recent years, many soft packaging enterprises gradually from dry to solvent-free production. On the one hand, reduce solvent emissions, while reducing costs, and efficiency is greatly increased, can be said to be a lot.
however, in the enjoyment of welfare at the same time, many manufacturers also eat a lot of losses, especially the appearance of glue dry aspects more, the loss is less tens of thousands, many up to hundreds of thousands of have

. The phenomenon of glue inament has gradually become the most headache for solvent-free users. Today would like to work with colleagues in the soft packaging industry to explore why there will be glue dry phenomenon, as a production and users and how to avoid this phenomenon?
first of all, let's take a look at the phenomenon of glue drying out?
At present, we often encounter the phenomenon of inact basically includes the following:
1, the whole batch of products, the entire layout is all dry

; General manufacturers do not do the situation is mostly these kinds, we are to analyze and explore.
When the first phenomenon occurs, the entire layout, the whole batch of products are not dry, there are generally the following reasons:
(1) glue manufacturers to provide glue itself has problems or provide glue ratio problems;
(2) workshop personnel operating ratio error;
(3) mixed glue pipe, glue cylinder filter and other blockage.
solution:
(1) choose the market more mainstream products, quality credibility trusted manufacturers;
(2) requires workshop production staff to record the daily production of products with glue, found abnormal and timely adjustment. Now you can see the real-time amount of glue used on each device, calculate the amount of glue per square meter according to different products, and calculate whether the ratio is accurate (with a record table).
(3) regular cleaning of glue cylinders, pipes, mixing head and other accessories.
When there is intermittent or one non-dry situation, the cause of this problem is relatively complex, but in general there are no more than two types of reasons:
(1) improper operation caused by blockage
;
but mainly improper operation caused by the majority of problems.
solution:
(1) First analyze the possible causes of blockage: generally speaking, the clogging site is no more than a cylinder, hose, mixing head, static mixer and other parts.
know where it might occur, how can we avoid it? Can only rely on the usual our attention to cleaning, we recommend:
a, glue using large barrel packaging, directly into the glue cylinder, as far as possible to reduce the opening of the cylinder contact air, causing glue absorption water reaction.
b, it is highly recommended that the glue cylinder do not change glue, especially different manufacturers, different models of glue. Avoid causing unnecessary reactions and the phenomenon of blockage of accessories such as cylinders, hoses, mixing heads, etc. If you do need test glue, you can first use manual adhesive.
c, it is recommended that the glue cylinder regularly (January-March) for cleaning, every 1-2 years for a large cleaning, you can seek equipment manufacturers technical support cleaning methods.
d, it is recommended that the hose every 1-2 years to replace one, to prevent the inside of the blockage.
, recommended mixing head equipped with 2, once a week replacement, replaced mixing head in solvent soaked for about a week, and then thoroughly cleaned.
f, it is recommended that the mixing hose every 1-2 days to replace one, at present, many large enterprises a shift to change one.
g, if the holiday situation needs a long shutdown, you must clean the glue in the glue tank, and then use ethyl ester to add to beat off, preferably with an air gun and then blow down. Then use the new ethyl ester and then repeated injection and then beat off, cycle 2-3 times. Re-inject transformer oil to fill the hose and apply butter to the mixing head to prevent contact with air.
(2) Sometimes there will be some more regular dry, this time we should pay attention to whether there is a hose or mixed glue head in a semi-clogging state, when the glue surface is insufficient automatic glue, due to a bit of blocked resistance, in a moment A part of the glue did not play, with the pressure increased then normal up, the place where the problem is the spray head began to play glue position, with swinging elsewhere there is no.
(3) This may also occur because the static mixer is not plugted into the plastic tube, and some of the glue flows along the plastic pipe wall into the metering roller, which can also cause dry conditions.
(4) Of course, there are some equipment automatic mixer may appear out of the glue out of pace, when A glue out of the action slightly slower, will also cause this situation, so choose a better equipment is also critical.
are some of the problems that the author usually encounters in his work, as well as some of the solutions we have adopted, hoping to help the packaging enterprises. Of course, the problems in the compound from all sides, the reasons for the emergence of a variety of solutions are also many, everyone has their own different solutions, but in general we must be in line with the objective attitude of facts to analyze the possible causes, article by article exclusion, find the real cause, and then seek the best solution, and gradually form a standard operating process, in order to minimize quality problems, avoid unnecessary losses. Packaging industry colleagues who have different views on such issues are also welcome to contact me, we exchange with each other, common progress.
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