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With the continuous development of China's economy, more and more daily chemical products have entered everyone's daily life. If we carefully observe it, it is not difficult to find that most of the daily chemical products on the market use self-adhesive labels , because the self-adhesive labels are easier to achieve the packaging effect required by the daily chemical products.
However, in the actual application process, we also see that some users often use the wrong materials to make labels because they do not understand the physical properties of the self-adhesive materials, which eventually leads to a certain degree of economic loss. Some label printing companies are also lost. The order. Therefore, the author wants to use some cases to analyze some common problems, and hopes to provide reference and reference for label companies and end users when choosing the most suitable label materials for daily chemical products.
1. The problem of lifting the toilet liquid bottle and the coated paper label
I have encountered such a case, the customer reported that the label began to pick up after 24 hours on the label of the toilet liquid. At the time, the author felt very strange. Generally speaking, after 24 hours of labeling, the adhesive will be completely combined with the surface of the object to be attached. It should be the strongest when it is applied. Why does it start to pick up 24 hours after labeling? What? After field investigation, it was found that the customer used the label processed by coated paper materials.
We know that paper has a certain water absorption, and the bottle as a sticker is made of plastic. After the bottle is labeled, it is placed in the warehouse. According to the author's test, the relative humidity of the labeling workshop was 55%, while the relative humidity of the warehouse was only 25%. The humidity of the warehouse was too different from the humidity of the labeling workshop. Although the plastic bottle does not shrink due to humidity changes, the label shrinks due to the rapid loss of moisture after being placed in the warehouse, which is why the label is lifted.
In fact, the bottle of daily chemical products on the market is mainly made of high-density PE or PP materials. Therefore, the film self-adhesive label with the same material is most suitable: on the one hand, the film material is not susceptible to humidity; on the other hand, The film label with the same material of the bottle has the same shrinkage rate as the bottle, so it is the least prone to the problem of lifting.
However, toilet liquid is a relatively low-end daily chemical product. If the use of film self-adhesive label materials will increase the cost of the product to some extent, it is recommended that enterprises that use coated paper to process such labels for cost reasons are recommended. Be sure to cover or glaze the label to reduce the impact of external humidity changes on the label material.
2. The problem of wrinkles and skew in PE labeling
On one occasion, some label companies reported to the author that the daily label produced by them had more serious wrinkles and skews in the process of automatic labeling. I hope the author can help analyze the reasons. So the author went to the customer factory for a site survey. In the investigation, it was found that the labeling line of the daily chemical company was quite fast and could reach 300 bottles/min. The label of the problem is made of PE material. This material is soft. Under normal circumstances, even if the bottle is squeezed after labeling, the label will not wrinkle. The label company is also out of this. The PE material processing label was selected for the point test.
However, it is precisely because the material is too soft, when the high-speed labeling is not enough, the phenomenon of labeling wrinkles and skews will occur. Customers who encounter such high-speed labeling and have certain requirements on the stiffness and softness of the label material may recommend PE/PP co-extruded materials, which have unidirectional stretchability, that is, one side is very soft. The other side is very strong, and Avery's Fasson and Plymans materials are representative of this material.
3. The problem of "oil penetration" after labeling hot melt adhesive materials
Once a label company processed a batch of labels for a daily customer, after labeling, the label appeared to have a similar problem of “oil penetrationâ€, that is, the label seemed to be oiled, and this phenomenon over time The transition is getting worse. It turns out that the adhesive used by this label company is hot-melt, and the bottle material that is attached is just PVC.
In fact, hot melt adhesive materials can not be used to attach PVC bottles, because the two will chemical reaction, thus changing the chemical structure of hot melt adhesives. The above mentioned "oil penetration" phenomenon is the occurrence of hot melt adhesives and PVC materials. The result of a chemical reaction. Later, the author learned through detailed understanding that this daily chemical company used hydrosol labels. The chemical properties of the adhesives were relatively stable and did not react with PVC materials. Therefore, there was no problem of “oil penetrationâ€. .
This case makes us notice that the selection of label materials for daily chemical products is not only related to the type of surface materials, but also the choice of the type of adhesive.
The above content is reproduced in the "Tagged Technology" official WeChat (biaoqianjishu), authorized by the company to publish, copyright, piracy will be investigated!
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