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The first step in making a paper double-wall insulated hot corrugated cup is to cut food-grade cardboard. Food-grade cardboard is different from ordinary cardboard. It uses special raw materials and processes in the production process to ensure that it meets food safety standards and can directly contact beverages without releasing harmful substances. This kind of cardboard has good toughness and stiffness, providing basic conditions for subsequent production. The cutting process needs to use high-precision cutting equipment to cut large-format food-grade cardboard into sheets of suitable size according to the pre-designed cup size specifications. The dimensional accuracy of these sheet materials has an important impact on subsequent production. Accurate cutting can ensure that the final cup has a regular shape and a stable structure.
After cutting is completed, the key creasing process begins. Crimping is an important means to give cardboard a corrugated structure. Through professional creasing equipment, a specific pressure is applied to the sheet cardboard to form regular grooves and protrusions. These grooves and protrusions are intertwined to form a corrugated shape. The design of the corrugated structure is not random, but based on the principle of air insulation in physics. Air is a poor conductor of heat. The corrugated structure forms multiple air chambers inside the cup, which can effectively block the transfer of heat, thereby achieving a heat-insulating effect. During the indentation process, the size of the pressure, the spacing and depth of the indentation are accurately calculated and debugged to ensure that the formed corrugated structure can not only ensure the heat insulation performance, but also maintain the strength of the cardboard, so that the cardboard will not be damaged or the strength will be reduced due to excessive indentation.
After the indentation process is completed, the folding process follows. The operator folds the indented cardboard in a pre-set manner so that the grooves and protrusions cooperate with each other, and the original flat cardboard is constructed into a three-dimensional corrugated shape. This process requires strict compliance with the design requirements to ensure that the folding angle is accurate and that each part can fit tightly. The folded cardboard initially presents the prototype of the cup, but at this time it is only a loose structure, and the parts need to be fixed together through the bonding step.
Bonding is the key link to make the structure of the paper corrugated cup stable. Use an adhesive that meets food hygiene standards and apply it evenly to the parts that need to be connected. These adhesives can form a strong connection after drying without affecting the safety of the beverage. When applying the adhesive, the amount should be controlled. Too little may result in a loose connection and the cup will easily fall apart; too much may overflow, affecting the appearance and use of the cup. After applying, the various parts are precisely docked and a certain amount of pressure is applied to allow the adhesive to fully function and tightly bond the parts together. After bonding, the basic structure of the cup is determined and has a certain strength and stability.
After the bonding is completed, the assembly step is required. This step is mainly to install the cup bottom and the cup cover (if there is a cup cover design). The installation of the cup bottom needs to ensure that it fits tightly with the cup body to form a sealed space to prevent the beverage from leaking. The cup bottom is usually made of the same or compatible material as the cup body, and it is fixed to the cup body through a specific process. For paper corrugated cups with cup lids, the design of the cup lid should consider both sealing performance to maintain the temperature of the beverage and prevent spillage, and easy opening and closing. The connection method between the cup lid and the cup body can be snap-on, screw-on, etc. No matter which method is used, it must be ensured to be stable and reliable during use.
From the perspective of materials, food-grade cardboard, as the core material of paper corrugated cups, has good processing performance in addition to safety. It can be surface treated according to different needs, such as lamination, printing, etc. Lamination can enhance the waterproof and oil-proof properties of cardboard, extend the service life of the cup, and improve the texture of the cup; printing can print various patterns and texts on the surface of the cup to play a role in publicity and beautification. In addition, paper materials themselves have a certain degree of degradability. Compared with cups made of plastic and other materials, paper corrugated cups can decompose naturally faster after being discarded, reducing pollution to the environment, which is in line with the current environmental protection concept.
In practical applications, paper corrugated cups are widely used in many fields due to their excellent thermal insulation and environmental protection characteristics. In the beverage industry, whether it is a coffee shop, milk tea shop or fast food restaurant, paper corrugated cups are a common choice for hot drinks. After consumers buy hot drinks such as coffee and milk tea, they will not feel hot in their hands when holding a paper corrugated cup due to the high temperature of the drink, and can enjoy it with peace of mind. Moreover, after consumers finish drinking, paper corrugated cups can be recycled. Through professional recycling processes, these discarded cups can be reprocessed into other paper products to achieve resource recycling.
In some outdoor activities and gatherings, paper corrugated cups are also very useful. When people are picnicking or camping, they carry paper corrugated cups to hold hot water, hot soup, etc., which is convenient and hygienic. Its lightness will not add too much burden to travel, and its good thermal insulation performance can ensure that the drink maintains a suitable temperature for a period of time. Even if the cup is accidentally dropped, the paper material will not easily break and cause danger compared to glass, ceramics and other materials.
