Paste boxes are glued manually or mechanically on the overlapping tongues of the carton, and then they can be butted and bonded to the corresponding edges to achieve molding. Paste box is the last production process of carton molding. How its process directly affects the packaging quality of products.
1 Glue box quality requirements and on-site quality inspection methods
Generally, the bonding width of the overlapping tongues of small and medium-sized carton boxes can be set between 28mm and 30mm, the coating thickness of the adhesive is preferably 0.3mm to 0.5mm, and the skew of the glue coating is controlled to ≤3mm. Adhesive coating should be uniform, sufficient, no overflow glue, no wild glue when brushing the glue. It is required to keep 2mm ~ 3mm by the inner edge and do not brush the glue, so as to avoid the overflow of the adhesive to cause the walls to stick to each other. The carton joints of the other piece should be aligned. After bonding and molding, the box body should be relatively square. The scissors difference is controlled by standard. The medium box is not more than 6mm; the small box is not more than 4mm. The operator should pay attention to the frequent self-inspection of samples during the paste box process. The adhesion fastness of the lap tongue should be checked for about half an hour after the bonding is formed. Hold the sides of the two overlapping parts with both hands, and pull them in the opposite direction of the plane with moderate force. If the separation resistance of the two overlapping parts is large or there is obvious fluff damage on the paper after separation, it means the overlapping tongue The bonding is relatively strong, if the overlapping parts on both sides are easy to separate, and there is no obvious sign of fluff damage after separation, it means that the bonding is not strong. For this reason, when selecting paste box adhesives, the types of adhesives should be determined according to the characteristics of the tissue surface, and when mixing and using adhesives, care should be taken to stir them evenly. If manual paste box is used, pay attention to compact the overlapped parts by hand during operation to prevent the adhesive from suspending on the paper surface or uneven contact with the paper surface to cause poor adhesion. In addition, after the carton is bonded and molded, it should be placed under pressure for half an hour before being packed to ensure the fastness of the sticky tongue.
2 Analysis of several situations affecting the quality of paste boxes
In the production process of paste box molding, if the production process is not properly controlled, it is prone to quality problems such as degumming, resulting in poor adhesion of the lap tongue and quality problems such as skew molding. The reasons are as follows.
1) Unsuitable adhesive properties
When the fluidity of the adhesive is unsuitable, it is easy to cause uneven coating due to the adhesive being too thick; if the composition and ratio of the adhesive are unsuitable, the adhesive will be prone to loose adhesion after coating; if When there is a problem with the solvent characteristics of the adhesive, there may be premature or slow drying, which will affect the fastness of the glue box. Therefore, when choosing an adhesive, you should pay attention to understand the characteristics of different manufacturers and different types of adhesives, and conduct small batch production tests in order to accurately grasp the characteristics of the adhesive, and then select the appropriate adhesive according to the characteristics of the product Agent. For example, food cartons should use environmentally friendly water-based adhesives, which are mainly non-toxic and tasteless, which can better prevent indirect contamination of food by poor adhesives; and frozen food cartons should be bonded with hot-melt adhesives In order to avoid cracking at the bonding part of the carton under low temperature and cold storage environment; for the outer packaging carton of high-end goods with UV varnish or film on the surface, it can be bonded with a suitable adhesive; for non-food 1. The carton on the surface adopts general glazing technology, as long as it uses ordinary white latex.
2) The adhesive deteriorates
As some substances in the adhesives change over time, their characteristics are prone to variability and affect the bonding performance during use. Therefore, when purchasing and using, we should pay attention to the shelf life of the adhesive, at the same time, we must control the appropriate inventory, and take good care of the principle of "advance first". In order to prevent the adhesive from contacting the air and evaporating the solvent, and oxidizing or mildewing its constituent components, it should be sealed and stored immediately after opening the lid, unpacking and using. Adhesives should also be avoided to store in bad environments such as high temperature, low temperature and humidity.
3) The problem of adhesive preparation
In the case where the adhesive is thick or the viscosity of the adhesive is unsuitable, some factories often use some solvents or other auxiliary materials in a certain adhesive for formulation to facilitate coating and improve the flow performance of the adhesive. . If the solvent and auxiliary materials used in the formulation are not compatible with the adhesive and the amount of addition is too large or too small, or the manual preparation cannot be used to make the adhesive fully stirred evenly, it is prone to paste box. Insufficient adhesion. Therefore, when preparing the adhesive, the solvent and auxiliary materials recommended by the manufacturer should be used, and the machine should be electrically stirred to ensure the stability and reliability of the quality of the adhesive.
4) Improper paste box operation method
If manual paste boxes are used for production operations, the adhesive edges of each carton are generally arranged in a ladder shape. If the offset positions of the adhesive edges of each carton are staggered or there are too many glues at one time, and the lap tongue is glued Without proper pressure after molding, it is prone to overflow glue or insufficient brushing area, and the last few carton adhesives dry, etc., will affect the stability of the paste box quality. Therefore, the manual paste box operation method should be proper. If the actual length of the lap tongue is 3cm, the position of the gap between each carton stick position should be controlled to be between 2.4cm and 2.6cm, plus the extension length after the thickness of the glue is compressed Within 3mm, the actual glue length of the overlapping tongue is not more than 3cm, to avoid the adhesion phenomenon caused by the overflow of the glue; the number of glue application each time should be controlled within 30, so as not to dry the adhesive and make the last few cartons stick Unsound closure; after manual glue application, the carton after bonding should be properly pressurized in time to ensure the fastness of bonding.
5) Unsuitable machine adjustment or related parts
When using the machine to paste boxes, if the production speed of the machine is adjusted too fast; the cardboard stopper is not blocked to the edge of the cardboard; the adjustment of the position or gap of the rubber wheel is unsuitable, and the rubber wheel, roller and other components are worn and loose, it is easy to cause Quality problems such as skewed paper, inaccurate cardboard positioning, inadequate (or uneven) glue application, and insufficient glue application. Therefore, in order to ensure the quality of the paste box, the production speed of the machine should be adjusted according to the characteristics of the cardboard: the cardboard is curled or uneven, and the speed of the machine can be adjusted slightly slower; the adjustment of the paper blocking gap of the cardboard should not be too loose or too tight; The contact position of the cardboard should be controlled properly; appropriate measures should be taken to repair the worn and eccentric rubber wheels and rollers.
6) The cardboard surface is too smooth
If the pre-printed carton facial paper adopts UV, calendering or laminating technology, because the surface is too smooth to absorb the adhesive, it will affect the adhesion performance of the cardboard. Therefore, if there is a polishing device on the machine, it is best to polish the overlapping tongue of the smooth carton; when the product is coated, the overlapping tongue should not be coated; the appropriate bonding should be selected according to the characteristics of the tissue surface Agents, such as calendered facial paper, can use adhesives suitable for calendered products to ensure the effect of adhesive quality.
7) Control of paste box operation environment
The temperature and humidity of the paste box production environment have a great influence on the permeability and drying performance of the adhesive. If the temperature on the production site is too high, the adhesive may be dried too quickly, the adhesive after coating may not penetrate completely, and the fixed dry coating may be brittle, which may affect the adhesion fastness of the paste box. Conversely, if the ambient temperature is too low, it will affect the fluidity of the adhesive, and it is easy to cause uneven coating of the adhesive and poor adhesion quality. In addition, if there is a lot of dust in the paste box production site, it is easy to fall into the adhesive and affect the quality of the paste box. Therefore, it is necessary to avoid the paste box operation under ultra-high temperature and ultra-low temperature conditions, and the paste box production workshop is required to stay away from the dust pollution area.
8) Inspection control measures are not in place
Due to different operators and different or non-standard operating methods of the same adhesive, the quality of paste boxes is also easily affected. Especially if the carton covered with film and polished surface is neglected during the sampling inspection control of the production process, the batch quality will be unstable. For example, when a factory is producing paste boxes, the production process and factory inspection measures are not implemented in place, so that when a large number of finished products are sent to the manufacturer for random inspection, the peeling phenomenon occurs when the lap tongue is gently pulled by the hand. Big loss. Therefore, it is necessary to pay attention to the inspection control during the production process. The carton that is just past and in the production process must be carefully inspected to prevent unstable batch quality. During the inspection, you can randomly tear open the adhesive mouth to observe the adhesion. Generally, most of the paper fibers are damaged after the lap tongue is peeled off, indicating that the quality of the paste box is relatively reliable. Through sampling inspection, quality problems and hidden dangers can be found in time, so that effective corrective measures can be taken in time.
In summary, paste box process technology and product quality control involve all aspects of production, such as surface characteristics of base paper, adhesive performance, equipment performance, operating methods, operating experience, management control measures, etc., will directly or indirectly affect paste The quality of the box, therefore, we can only effectively reduce or avoid the occurrence of various quality defects and improve the production efficiency and product quality only if we carry out careful, orderly and orderly control from the quality source to the entire production process.
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