[Chinese Packaging Network News] Heavy-duty packaging cartons for moisture production, in addition to protecting the packaging from the water soaked, mainly to prevent water infiltration of the box itself.
As the carton is wetted by water, the compressive strength and bursting resistance of the box will be greatly reduced, which will seriously affect the quality of the packaging. Heavy-duty packaging cartons for moisture production, usually coated with waterproof agent to solve. Therefore, according to the effect of the water repellent agent, the manufacturing method of the moisture-proof carton can be classified into: temporary water repellent treatment and permanent water repellent treatment.
Temporary water repellent
The heavy-duty carton has a temporary water-repellent function after being treated with a temporary water repellent during the production process. According to the interpretation of JIS Z 1537, when water falls on it for a short period of time, it does not become wet and it prevents water from penetrating the cardboard. Temporary water repellent treatment cardboard technology has been applied in all major carton factories in China for the past ten years. This water repellent was originally introduced from Japan and its text surface was "water pick-up agent."
This type of paint was used on fabric fibers early on and was later used for cardboard processing. Therefore, most tree carton manufacturers use the name of the water picking agent. The water extraction agent is a wax emulsion with a solid content of 48% to 51%. Its greatest feature is that it can be diluted with about 30 times of water when it is used, and then applied on the surface of the forming corrugated board, passing through 150 The temperature of about °C is dry, and the surface fiber of the paper has a low surface tension due to the wrapping of vinegar and forms a surface layer that does not wet the water. When it encounters water, the water does not infiltrate on the cardboard, forming a drop of water and falling down, thereby achieving a waterproof effect. However, the adhesion of the wax to the paper fiber is not good, especially when the water drawing agent is diluted 30 times, the solid content is only 1.5~, and only a very thin layer of paper surface fiber is covered with wax. In addition, wax size in wax emulsions is generally larger than that of common polymer emulsions, and it is difficult to penetrate deep into the paper fiber. Simultaneously, the water pick-up agent is generally sensitive to a class of chemicals such as alum, and is often fast on the surface of paper. Demulsification and sedimentation of the rice, so most of the wax particles in the water extractor only exist on a thin layer of paper. Under the effect of external friction, the wax is easily rubbed off, leaving no wax-wrapped fibers, and the waterproof effect is greatly reduced. In order to enhance the adhesion of the wax to the paper fiber, there are often rosin derivatives or carboxylated polymer emulsions in the water pick-up agent, which have good adhesion to the paper fiber, good compatibility with the wax and wxafd003. . In this way, their addition promotes the adhesion of the wax to the paper fibers, and at the same time, if the wax is modified, such as oxidation or basification, it also has similar effects and can increase the adhesion of the wax to the paper fibers. However, it must be pointed out that the increase in these measures, the concentration of the water pick-up agent formed at this concentration is still not a waterproof layer, so when it comes to friction, such as the carton in the handling, stacking process encounters friction, often will Make this waterproof surface useless. This is why a carton coated with a water-repellent agent is defined as a temporary waterproof carton. Currently, water pick-up agents are widely used in some carton factories and become a basic process. This is mainly due to the following four aspects: the price and machine coating ability of the water pick-up agent; the water pick-up agent maintains the true color of the paper and is in harmony with the current mainstream return to nature; the water pick-up agent has no adverse effect on the recovery of the carton; The water repellent effect of the water-repellent agent is perfectly suitable for the use of a general carton. However, it must be pointed out that the cartons used in some special circumstances, such as the need; Dongcai's cartons, need to be stored in a high-humidity environment, cartons, shipping cartons, when using water remover should be cautious. In actual practice, cartons that have been coated with water-drawing agents have been found. After being taken out of the frozen warehouse, the cartons have been deformed, causing economic disputes. Therefore, when recommending what kind of waterproof treatment, customers should fully consider the use environment of the customer's carton.
In addition, different grades of picking agents, their raw materials and preparation process are often different, with some differences in the water ratio, it is very important to use this appropriate water ratio. If the ratio of water is too high, the degree of water withdrawal will be significantly reduced and no waterproof effect will be achieved. When the ratio of water is too low, dark waxy oil spots will often form on the surface of the cardboard and damage the appearance of the cardboard.
Factors affecting the compressive strength of the carton
The carton compressive strength is the most important quality indicator for many commodity packaging requirements. During the test, the corrugated box is placed between the two pressure plates and pressurized to the pressure at which the carton collapses, which is the carton compressive strength.
1) Raw material quality
The base paper is the decisive factor in determining the compressive strength of the carton, as can be seen from the kellicutt formula. However, the influence of other conditions in the production process of corrugated cardboard can not be ignored, such as the amount of adhesives, impregnation, coating, and composite processing.
2) Moisture
Carton boxes are made of corrugated paperboard with high water content, or stored for a long time in a humid environment, will reduce its compressive strength. Fiber is a kind of strong water absorption. In the rainy season and high humidity in the air, the moisture balance between the moisture in the paperboard and the atmospheric environment is very important.
3) Box type
The box type refers to the type of box and the ratio of the same kind of box, and they have a significant influence on the compressive strength. Some carton boxes are composed of double-layer corrugated paperboards, and their compressive strength is significantly higher than that of single-layer boxes of the same specifications. Under the same conditions, the higher the box, the worse the stability and the lower the compressive strength.
4) Printing and Opening
Printing will reduce the carton compressive strength. Packing products with air permeability requirements to open holes in the box surface, or punching the handle hole in the box side will reduce the strength of the carton, especially the opening area is large, biased to one side, etc., the impact is more obvious.
5) Processing process deviation
In the process of box making, improper pressure lines, deep grooves, and poor bonding, will reduce the compressive strength of the box.
Modern office chair is made of full italian leather and aluminium alloy
1. Emphasize functional design, simple and smooth lines, and strong color contrast, which are the characteristics of modern style furniture.
2. Extensive use of new materials such as tempered glass and stainless steel as auxiliary materials is also a common decorative technique for modern style furniture, which can give people a sense of avant-garde and unrestrained.
3. Due to simple lines and few decorative elements, modern style furniture needs perfect soft fitting to show its beauty. For example, sofas need cushions, dining tables need tablecloths, beds need curtains and bed sheets. Soft furnishings are the key to modern style decoration. There are many styles of modern and simple chairs, which are enough to meet everyone's diversified market needs.
4. No matter how big the office is, it must be spacious. There is no need for cumbersome decoration and excessive furniture, and the overall coordination of space and furniture is reflected to the greatest extent in decoration and arrangement. In terms of modeling, geometric structures are mostly used, which is the modern minimalist fashion style
Office Chair,Office Leather Chair,Flex Office Chair
DELO SOFA , https://www.modernluxuryfurnitures.com