With the increasingly fierce competition in the paper packaging industry, customers are increasingly critical of the quality of corrugated boxes. This requires corrugated box manufacturers to continuously improve the quality of corrugated boxes, eliminate quality problems, and strive for quality without defects. At the same time, sublimate service quality, strengthen communication and exchanges with customers, listen to the opinions of customers, and make friends with customers. Only in this way can we take the initiative in market competition, reduce customer complaints about corrugated boxes and win the trust of customers. satisfy customer needs.
According to the customer's complaints about the quality of corrugated boxes for many years, corrugated boxes are mainly prone to the following quality problems. Only by avoiding these quality problems, the quality of corrugated boxes can stand the test of customers.
Inaccurate corrugated carton size The design and manufacture of corrugated cartons depended on size, size was wrong, and the corrugated cartons produced became waste products. Corrugated carton size is divided into inner diameter size, outer diameter size and processing size. Customers generally have strict requirements for the inner size of corrugated carton. The inner diameter of the carton must ensure that the contents can be installed, which is generally equal to the maximum outer diameter of the contents plus the parameter 3~7mm. The outer diameter size is the size used in the circulation. For the export corrugated box, the outer diameter size is very strict, otherwise it will affect the container shipment due to the size. This requires strict control of the production line board size, printing slotted pressure line size in the production process to ensure that the corrugated carton size is accurate.
Layout Printing Errors Corrugated carton layouts are mostly printed using text, which is extremely prone to errors. Once the design layout has not been corrected, the consequences will be disastrous. Under normal circumstances, the layout errors of corrugated cartons are often very apt to make people feel negligence. They are often more words, less words or wrong words. Proofreading must be carried out one by one during the proofreading process. As a result, the entire corrugated cartons were scrapped, and the proofreading work of corrugated cartons on various production companies must be taken seriously and must not be relaxed.
Layout printing is vague, dirty, missing white layout printing is fuzzy, dirty, leaking phenomenon is relatively common, directly affect the appearance of corrugated boxes, customers are very picky about this. Severely corrugated cartons can only be scrapped, and lighter ones can be repaired manually. Layout blurring is mainly caused by excessive printing pressure. There are mainly printed traces on the dirty surface of the layout. This requires the control of the printing process, the technical training of the printing operators, the improvement of the equipment's ability to control, and the cause of the defects. Analysis can find the answer in a timely manner and correct and correct it. The operation of the printing press is a team performance. Each person should understand their own work and responsibilities, and have the tacit cooperation in order to maximize the processing quality and efficiency of the equipment.
Indentation of the paperboard is too shallow in the horizontal direction, and the horizontal indentation line is not straight when the flap is collapsed or the folds are folded; the paperboard has a deep indentation in the longitudinal direction and cracks occur in the paper.
Cardboard indentation is one of the necessary processes for corrugated cardboard box processing. The quality of indentation plays an important role in cardboard folding or box use. The depth of indentation and position accuracy are different. Caused a deviation in carton size.
Cardboard transverse indentation is typically achieved in cardboard production lines using double-flanged indentations. Longitudinal indentations are typically done on a printing slot machine using a single flange indentation. Generally, the width of the single flange is 6-12mm, and the width of the double flange is about 10-16mm.
The principle of indentation is to adjust the pressure of the indentation to achieve easy folding and marked marks, but the paper inside is not broken as a standard.
For horizontal indentation, the center position of the upper and lower wheels should be aligned, and the indentation should be pressed through, that is, no gap is pressed. Generally, the thickness of the five-layer cardboard indentation is about 2mm. For the longitudinal indentation, the gap between the upper and lower wheels of the trace should not be adjusted too small, and at the same time, the water content of the cardboard should not be too low to prevent the paperboard from cracking during processing.
Folding of cardboard flaps is one of the important indicators of corrugated board quality. According to the national standard GB6543-86, the corrugated box flaps must be opened and rotated 180 degrees for more than 5 times, and there must be no cracks in the surface layer and the inner layer of the first and second types of box, and there must be no cracks in the outer layer of the type 3 boxboard. The total length of cracks must not exceed 70mm. However, in use, the customer's requirements are much stricter. They require the flaps to be folded 180 degrees outwards and downwards. There must be no cracks in the outside of the paper. This requires controlling the quality of the raw materials and avoiding the use of rough, low-grade corrugated paper. The corrugated base paper may burst the face paper when the flap is folded.
Too dry paper and paperboard is also an important reason for the breakage of the broken flaps. During the production process, the moisture content of paper and paperboard must be controlled.
The indentation of the flap fold line must be controlled so that the indentation is moderate. If the flap is found to be broken during production, immediately after the cardboard is removed from the machine, the inside of the paper flap is sprayed, and the flap is folded back to the two sides in the end. Can greatly improve the degree of folding cover bending.
Cardboard blister To solve cardboard blister To control and bond the adhesive well, in order to achieve the best adhesive effect.
Adhesive quality is the basic factor affecting the bonding of the paperboard. The concentration of various ingredients, technical indicators, formulation ratio and oxidation, gelatinization time and temperature must be strictly controlled during the formulation process. Every time the adhesive is prepared, it must be tested to stabilize the quality of the adhesive.
Effectively improve the quality of good raw materials, especially the tightness and moisture content of the base paper, strengthen the technical training of operators, improve the use of equipment and maintenance levels, according to the drying speed, paper, drying lane temperature is flexible Adjust the amount of glue and the equipment to run to the best condition, try to eliminate all kinds of unfavorable factors, so that the correct analysis and reasonable adjustment, bubble gum problems can be solved.
The low strength of cardboard raw materials is the main reason for the softness of cardboard. The quality of the corrugated base paper directly affects the compressive strength of the corrugated carton. Selecting a high-strength corrugated base paper can produce a strong and flexible corrugated carton. In addition, the inverting tiles of the cardboard will also cause the cardboard to be soft, and the emphasis should be placed on the adjustment of the printing pressure in the production line process and the printing process.
The cardboard box is soft, and the moisture content of the raw materials and the excessive amount of glue are important reasons. Due to the large amount of glue applied, the moisture in the glue penetrates into the corrugated medium and causes the corrugated sheet to become soft. After entering the drying board, the moisture in the paper board is not sufficiently distributed to make the board soft.
The printing color is not uniform or the color of the corrugated box paper is not uniform. The color samples will be different in different batches of supply, or color samples that do not meet the customer's requirements. In this case, they will generally be returned. This requires that, while strictly controlling the hue of the ink, the best method is to archive the print color samples when printing the first batch of products so that the same product can be checked for later printing.
Due to the different face paper manufacturers of corrugated cartons, there are differences in the color of the face paper. Even if the linerboard of the same manufacturer is different, there are color differences in different batches. This requires strict control when the raw materials are inspected in the factory. Archiving of the samples should be done at the same time. The cardboard box of the same manufacturer must be unified. At the time of production, the same corrugated cardboard box adopts the same boxboard paper to maintain the uniform color of the paper.
Corrugated paperboard paper with creases Corrugated paperboard paper with creases is mainly caused by the storage and transportation process. This circulation link often fails to attract the attention of the company and lacks quality control. In addition, during the production process of the carton, the strength of the noodle paper is not enough, the height in the pressure roller is not enough, and the uneven moisture content of the noodle paper can cause the top paper to fold up. (Qingdao Haier Quality Inspection Co., Ltd. Wang Lili Li Yutian)
According to the customer's complaints about the quality of corrugated boxes for many years, corrugated boxes are mainly prone to the following quality problems. Only by avoiding these quality problems, the quality of corrugated boxes can stand the test of customers.
Inaccurate corrugated carton size The design and manufacture of corrugated cartons depended on size, size was wrong, and the corrugated cartons produced became waste products. Corrugated carton size is divided into inner diameter size, outer diameter size and processing size. Customers generally have strict requirements for the inner size of corrugated carton. The inner diameter of the carton must ensure that the contents can be installed, which is generally equal to the maximum outer diameter of the contents plus the parameter 3~7mm. The outer diameter size is the size used in the circulation. For the export corrugated box, the outer diameter size is very strict, otherwise it will affect the container shipment due to the size. This requires strict control of the production line board size, printing slotted pressure line size in the production process to ensure that the corrugated carton size is accurate.
Layout Printing Errors Corrugated carton layouts are mostly printed using text, which is extremely prone to errors. Once the design layout has not been corrected, the consequences will be disastrous. Under normal circumstances, the layout errors of corrugated cartons are often very apt to make people feel negligence. They are often more words, less words or wrong words. Proofreading must be carried out one by one during the proofreading process. As a result, the entire corrugated cartons were scrapped, and the proofreading work of corrugated cartons on various production companies must be taken seriously and must not be relaxed.
Layout printing is vague, dirty, missing white layout printing is fuzzy, dirty, leaking phenomenon is relatively common, directly affect the appearance of corrugated boxes, customers are very picky about this. Severely corrugated cartons can only be scrapped, and lighter ones can be repaired manually. Layout blurring is mainly caused by excessive printing pressure. There are mainly printed traces on the dirty surface of the layout. This requires the control of the printing process, the technical training of the printing operators, the improvement of the equipment's ability to control, and the cause of the defects. Analysis can find the answer in a timely manner and correct and correct it. The operation of the printing press is a team performance. Each person should understand their own work and responsibilities, and have the tacit cooperation in order to maximize the processing quality and efficiency of the equipment.
Indentation of the paperboard is too shallow in the horizontal direction, and the horizontal indentation line is not straight when the flap is collapsed or the folds are folded; the paperboard has a deep indentation in the longitudinal direction and cracks occur in the paper.
Cardboard indentation is one of the necessary processes for corrugated cardboard box processing. The quality of indentation plays an important role in cardboard folding or box use. The depth of indentation and position accuracy are different. Caused a deviation in carton size.
Cardboard transverse indentation is typically achieved in cardboard production lines using double-flanged indentations. Longitudinal indentations are typically done on a printing slot machine using a single flange indentation. Generally, the width of the single flange is 6-12mm, and the width of the double flange is about 10-16mm.
The principle of indentation is to adjust the pressure of the indentation to achieve easy folding and marked marks, but the paper inside is not broken as a standard.
For horizontal indentation, the center position of the upper and lower wheels should be aligned, and the indentation should be pressed through, that is, no gap is pressed. Generally, the thickness of the five-layer cardboard indentation is about 2mm. For the longitudinal indentation, the gap between the upper and lower wheels of the trace should not be adjusted too small, and at the same time, the water content of the cardboard should not be too low to prevent the paperboard from cracking during processing.
Folding of cardboard flaps is one of the important indicators of corrugated board quality. According to the national standard GB6543-86, the corrugated box flaps must be opened and rotated 180 degrees for more than 5 times, and there must be no cracks in the surface layer and the inner layer of the first and second types of box, and there must be no cracks in the outer layer of the type 3 boxboard. The total length of cracks must not exceed 70mm. However, in use, the customer's requirements are much stricter. They require the flaps to be folded 180 degrees outwards and downwards. There must be no cracks in the outside of the paper. This requires controlling the quality of the raw materials and avoiding the use of rough, low-grade corrugated paper. The corrugated base paper may burst the face paper when the flap is folded.
Too dry paper and paperboard is also an important reason for the breakage of the broken flaps. During the production process, the moisture content of paper and paperboard must be controlled.
The indentation of the flap fold line must be controlled so that the indentation is moderate. If the flap is found to be broken during production, immediately after the cardboard is removed from the machine, the inside of the paper flap is sprayed, and the flap is folded back to the two sides in the end. Can greatly improve the degree of folding cover bending.
Cardboard blister To solve cardboard blister To control and bond the adhesive well, in order to achieve the best adhesive effect.
Adhesive quality is the basic factor affecting the bonding of the paperboard. The concentration of various ingredients, technical indicators, formulation ratio and oxidation, gelatinization time and temperature must be strictly controlled during the formulation process. Every time the adhesive is prepared, it must be tested to stabilize the quality of the adhesive.
Effectively improve the quality of good raw materials, especially the tightness and moisture content of the base paper, strengthen the technical training of operators, improve the use of equipment and maintenance levels, according to the drying speed, paper, drying lane temperature is flexible Adjust the amount of glue and the equipment to run to the best condition, try to eliminate all kinds of unfavorable factors, so that the correct analysis and reasonable adjustment, bubble gum problems can be solved.
The low strength of cardboard raw materials is the main reason for the softness of cardboard. The quality of the corrugated base paper directly affects the compressive strength of the corrugated carton. Selecting a high-strength corrugated base paper can produce a strong and flexible corrugated carton. In addition, the inverting tiles of the cardboard will also cause the cardboard to be soft, and the emphasis should be placed on the adjustment of the printing pressure in the production line process and the printing process.
The cardboard box is soft, and the moisture content of the raw materials and the excessive amount of glue are important reasons. Due to the large amount of glue applied, the moisture in the glue penetrates into the corrugated medium and causes the corrugated sheet to become soft. After entering the drying board, the moisture in the paper board is not sufficiently distributed to make the board soft.
The printing color is not uniform or the color of the corrugated box paper is not uniform. The color samples will be different in different batches of supply, or color samples that do not meet the customer's requirements. In this case, they will generally be returned. This requires that, while strictly controlling the hue of the ink, the best method is to archive the print color samples when printing the first batch of products so that the same product can be checked for later printing.
Due to the different face paper manufacturers of corrugated cartons, there are differences in the color of the face paper. Even if the linerboard of the same manufacturer is different, there are color differences in different batches. This requires strict control when the raw materials are inspected in the factory. Archiving of the samples should be done at the same time. The cardboard box of the same manufacturer must be unified. At the time of production, the same corrugated cardboard box adopts the same boxboard paper to maintain the uniform color of the paper.
Corrugated paperboard paper with creases Corrugated paperboard paper with creases is mainly caused by the storage and transportation process. This circulation link often fails to attract the attention of the company and lacks quality control. In addition, during the production process of the carton, the strength of the noodle paper is not enough, the height in the pressure roller is not enough, and the uneven moisture content of the noodle paper can cause the top paper to fold up. (Qingdao Haier Quality Inspection Co., Ltd. Wang Lili Li Yutian)
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