The corrugated cartons frequently used in the market today are often present with stapled cartons. Due to the presence of staples in the stapled cartons, the internal products are scraped, the nail heads are contaminated with moisture and rust, and the nail heads are not easily connected to the staples. Factors such as breakage of the connection, and several regulations in export packaging, use staple-free cartons in the packaging of food, medicine, agricultural and sideline products, and textiles.
Commonly used staple-free cartons are often made by adhering adhesives to the carton joints, and a small number of adhesive tapes are used for bonding. Another new type of HL staple-free carton on the market is the adhesive bonding of the carton joints with a special process. The bonding mechanism and method of only three kinds of stapleless cartons are described below.
Adhesive bonding The bonding mechanism of this kind of carton is: manually or automatically feeding the carton board with slotted pressure lines into the glue application mechanism, and applying glue from the rubberizing wheel to the tab, using a folding bar or guide The role of the wheel causes the board to bend, close and overlap. The lap joint is under the action of the pressure roller and presses the glued tongue to enhance the adhesion. The adhesive used is mostly polyvinyl acetate emulsion.
The adhesive tape is connected to the interface of the carton by using an adhesive tape. The process is to attach a tape feeding, cutting, and sticking device on the adhesive machine so that the interface of the cardboard after the slotted pressure line is aligned in the form of butt joint. OK, then tape the tape to make it a cartons product. The carton attached with tape can not be used as a zipper. The finished carton has no exposed iron wire. Its inner and outer surfaces are very smooth and will not accidentally damage the inner product. However, in order to ensure the strength of the bonding, adhesive tapes reinforced with vinylon fibers are generally used. The cost is higher than that of adhesives or wire nails. When converting tapes, it is also necessary to stop the machine and waste time; if the carton Waterproof material with exterior coating cannot be overlapped by this method, and its use range is limited.
The HL cartons HL staple-free cartons are distinctly different from the above two stapleless cartons. The carton joints are processed using a planing process. The processing of the tabs is a ladder-like, “T”-shaped structure that is applied by a rubberizing wheel. Bonded into a box, unlike the first two types of carton, the HL carton after the box is viewed from the outside, almost no overlap, because the overlapping part of the lap paper is overlapped with the face paper, and the corrugated and corrugated board is lapped. Then, the overlap thickness and corrugated board thickness are uniform.
Another difference between the HL cartons and the first two types of staple-free cartons is that the first two types of cartons need to be slotted, angled, and pressed. The HL carton board does not need to be slotted and chamfered. The box has no gaps between the four walls. It is a closed shell with no weak spots.
The joint strength of the three kinds of staple-free cartons is much better than that of nails, especially in HL cartons, where the desirability is almost 4 times that of nails, 2 times that of nailless boxes, and the elongation rate is For a small amount of four cartons, the overall structural size of the cartons after the box is ensured, and the stability of the cartons is enhanced.
The advantages and disadvantages of the three types of staple-free cartons Three staple-free cartons have advantages over nail-mounted cartons. Due to its non-nail, scraping uneven internal contents, it does not contain contaminated contents due to moisture and rust of the nail head, which meets the requirements of the green packaging regulations for export products. As far as its cost is concerned, the cost of tape-free cartridges is high, and the recycling of cartons after disposal is also very complicated. According to the three carton joining methods, the HL carton is significantly better than the former two. The first two nailless carton joints are mostly one-layer paper sticky, and the outside view is to expose cuts and corrugations. , that is, the surface paper and corrugated paper peeling foaming, drumming phenomenon, it is easy to greatly reduce the strength of the joint; due to the slotting, cutting angle process caused by the weak point of the carton strength, compression, ring compression strength, geometric instability , It is prone to tearing from the joint after packing the goods. The HL cartons are different. The cardboard box has no concept of notching and corner cutting. The joint paper and the face paper, the corrugated paper and the corrugated paper layering are glued into a whole, and there is no weak point in the whole body of the cardboard box. High pressure and joint strength, good overall structural performance, fully enclosed, full-paper, easy to recycle, dust-proof, moisture-proof, anti-pollution, anti-counterfeiting, is recognized as a green packaging product. HL cartons have a lot of potential in the field of staple-free cartons and have great market potential. (Sun Gensheng)