Domestic corrugated cardboard has a high sediment content, and has a certain influence on the quality, service life, and cutting length of the slitting thin paper knife. In addition, the precision of the production line equipment, line speed, matching compatibility of the grinding wheel, and mechanical operation skills are also important factors that affect the service life of slitting thin paper knife. The thin knife material chosen by carton manufacturers is generally high-speed steel (SKH9 SHK51). This article takes high-speed steel as an example to discuss how to choose a slitting knife suitable for domestic paper.
When carton manufacturers purchase thin knives, the first consideration is price and cut length, because they are an important factor that directly affects the level of production costs. The factors that affect the life of the thin knife are: steel formulation, rolling process, heat treatment process, grinding process and thickness. Because of the above-mentioned factors, imported and domestic thin knives have different cutting service life, and the prices differ greatly.
In the five-year practice of introducing the thin knife slitting process in China, it was found that the imported thin knife was not suitable for domestic paper.
First of all, due to the high sand content of domestic corrugated board, the cutting service life of imported thin knife is greatly reduced. Second, there is a problem with the compatibility of imported thin knives and domestic equipment. The domestic equipment is less precise than the imported equipment, poor in stability, the grinding assembly and the cooling assembly are not matched, and the performance of the imported thin knife is further compromised.
Furthermore, in the increasingly fierce competition of cardboard prices, the high prices of imported thin knives have led to higher production costs.
Since the imported thin knife is not suitable, can the domestic thin knife be competent? Through repeated trial and comparison, it was found that without affecting the quality of the corrugated board cut, changing the general thickness and edge angle of the thin knife can make the domestic high-speed steel thin knife approach the cutting life of imported high-speed steel thin knife.
The general thickness of imported thin knife is 1.1mm. Under the same Rockwell hardness, the domestic high-speed steel thin knife with 1.5mm thickness and the imported high-speed steel thin knife with 1.1mm thickness are used on the same wire machine for cutting quality and use. There is no difference in life. The other left evidence that does not affect the quality of the incision is that the thickness of the tungsten steel thin knife equipped with the high-grade inlet line is also 1.5mm.
1.1mm thickness of domestic high-speed steel thin knife will appear running deviation phenomenon when the line speed is higher than 100 meters per minute, while the 1.5mm thickness domestic high-speed steel thin knife has been subjected to the test of line speed higher than 160 meters per minute and the slightest Does not affect the cutting quality.
In terms of price, the sales price is higher by about 10% for domestic high-speed steel thin blades with 1.5mm thickness compared to 1.2mm. Take Φ260mm×Φ114mm×1.5mm domestic high-speed steel thin knife as an example, the market price is about 160 yuan, while the market price of imported high-speed steel thin knife is more than 220 yuan. Under the premise of the same cutting life, the price performance of the domestic high speed steel thin blade 1.5mm is clearly dominant.
To sum up, carton manufacturers should purchase custom tailored slitting knives according to the line speed and production requirements of their own production equipment. The low-speed line machine (60m/min or less) is also not necessary to choose high-speed steel thin knife, 1.5mm thickness of cold work tool steel (SKD-11) thin knife also has a better price, it is more suitable for small single job use.
When carton manufacturers purchase thin knives, the first consideration is price and cut length, because they are an important factor that directly affects the level of production costs. The factors that affect the life of the thin knife are: steel formulation, rolling process, heat treatment process, grinding process and thickness. Because of the above-mentioned factors, imported and domestic thin knives have different cutting service life, and the prices differ greatly.
In the five-year practice of introducing the thin knife slitting process in China, it was found that the imported thin knife was not suitable for domestic paper.
First of all, due to the high sand content of domestic corrugated board, the cutting service life of imported thin knife is greatly reduced. Second, there is a problem with the compatibility of imported thin knives and domestic equipment. The domestic equipment is less precise than the imported equipment, poor in stability, the grinding assembly and the cooling assembly are not matched, and the performance of the imported thin knife is further compromised.
Furthermore, in the increasingly fierce competition of cardboard prices, the high prices of imported thin knives have led to higher production costs.
Since the imported thin knife is not suitable, can the domestic thin knife be competent? Through repeated trial and comparison, it was found that without affecting the quality of the corrugated board cut, changing the general thickness and edge angle of the thin knife can make the domestic high-speed steel thin knife approach the cutting life of imported high-speed steel thin knife.
The general thickness of imported thin knife is 1.1mm. Under the same Rockwell hardness, the domestic high-speed steel thin knife with 1.5mm thickness and the imported high-speed steel thin knife with 1.1mm thickness are used on the same wire machine for cutting quality and use. There is no difference in life. The other left evidence that does not affect the quality of the incision is that the thickness of the tungsten steel thin knife equipped with the high-grade inlet line is also 1.5mm.
1.1mm thickness of domestic high-speed steel thin knife will appear running deviation phenomenon when the line speed is higher than 100 meters per minute, while the 1.5mm thickness domestic high-speed steel thin knife has been subjected to the test of line speed higher than 160 meters per minute and the slightest Does not affect the cutting quality.
In terms of price, the sales price is higher by about 10% for domestic high-speed steel thin blades with 1.5mm thickness compared to 1.2mm. Take Φ260mm×Φ114mm×1.5mm domestic high-speed steel thin knife as an example, the market price is about 160 yuan, while the market price of imported high-speed steel thin knife is more than 220 yuan. Under the premise of the same cutting life, the price performance of the domestic high speed steel thin blade 1.5mm is clearly dominant.
To sum up, carton manufacturers should purchase custom tailored slitting knives according to the line speed and production requirements of their own production equipment. The low-speed line machine (60m/min or less) is also not necessary to choose high-speed steel thin knife, 1.5mm thickness of cold work tool steel (SKD-11) thin knife also has a better price, it is more suitable for small single job use.
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