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包装袋封口处无法封上
(1) 热封温度不够
(1) heat sealing temperature is not enough.
通常情况下，以OPP为里料的复合袋，当制袋总厚度为80～90μm时，热封温度要达到170～180℃；以PE为里料的复合袋制袋总厚度为85～100μm时，温度宜控制在180～200℃。只要制袋总厚度有所增加，热封温度就必须相应提高。
Usually, when the total thickness of the bag is 80-90 micron, the heat sealing temperature should reach 170-180 micron, and when the total thickness of the bag is 85-100 micron, the temperature should be controlled at 180-200 micron. As long as the total thickness of the bag is increased, the heat sealing temperature must be raised accordingly.
(2) 热封速度过快
(2) heat sealing speed is too fast.
封不上口还与封口机速度快慢有关。如果速度过快，封口处还未来得及热化就被牵引辊传送至冷压处进行冷却处理了，自然达不到热封质量要求。
The sealing is not related to the speed of the sealing machine. If the speed is too fast, the seal has not yet been heated by the traction roll to the cold pressure for cooling treatment, naturally can not meet the quality requirements of the heat seal.
(3) 冷压胶轮压力不合适
(3) the pressure of the cold pressure rubber wheel is not suitable.
冷压胶轮上下各有一个，它们之间的压力要适中，调节压力时只需夹紧弹簧即可。
Each of the cold-pressed rubber wheels has its own upper and lower, and the pressure between them should be moderate. It is only necessary to clamp the spring when adjusting the pressure.
(4) 热封薄膜质量有问题
(4) the quality of heat sealing film is defective.
封口封不上还与热封薄膜质量有关，如果复合里料电晕处理不均匀，效果不好，并恰好出现在封口处，肯定无法封口。这种情况很少见，然而一旦出现，产品必然报废。所以在彩印包装行业，是下道工序监督上道工序，一发现质量问题，必须及时分析起因并加以解决。
The sealing quality is also related to the sealing film quality. If the composite lining corona treatment is not uniform, the effect is not good, and happens to appear in the sealing place, it is certainly impossible to seal. This situation is rare, but once it appears, the product will inevitably be scrapped. Therefore, in the color printing and packaging industry, is the next process to supervise the last process, a quality problem found, must be timely analysis of the causes and solve.
如果封口处有水分、脏污，也会造成封口不牢。
If the seal is water and dirty, it will also cause poor sealing.
总之，解决第一种封合不牢问题，一般可适当提高热封温度，再降低热封速度，同时加大冷压胶轮的压力。
In short, to solve the first sealing problem, generally can properly increase the heat sealing temperature, and then reduce the heat sealing speed, while increasing the pressure of cold-pressed rubber wheels.
(1) heat sealing temperature is not enough.
通常情况下，以OPP为里料的复合袋，当制袋总厚度为80～90μm时，热封温度要达到170～180℃；以PE为里料的复合袋制袋总厚度为85～100μm时，温度宜控制在180～200℃。只要制袋总厚度有所增加，热封温度就必须相应提高。
Usually, when the total thickness of the bag is 80-90 micron, the heat sealing temperature should reach 170-180 micron, and when the total thickness of the bag is 85-100 micron, the temperature should be controlled at 180-200 micron. As long as the total thickness of the bag is increased, the heat sealing temperature must be raised accordingly.
(2) 热封速度过快
(2) heat sealing speed is too fast.
封不上口还与封口机速度快慢有关。如果速度过快，封口处还未来得及热化就被牵引辊传送至冷压处进行冷却处理了，自然达不到热封质量要求。
The sealing is not related to the speed of the sealing machine. If the speed is too fast, the seal has not yet been heated by the traction roll to the cold pressure for cooling treatment, naturally can not meet the quality requirements of the heat seal.
(3) 冷压胶轮压力不合适
(3) the pressure of the cold pressure rubber wheel is not suitable.
冷压胶轮上下各有一个，它们之间的压力要适中，调节压力时只需夹紧弹簧即可。
Each of the cold-pressed rubber wheels has its own upper and lower, and the pressure between them should be moderate. It is only necessary to clamp the spring when adjusting the pressure.
(4) 热封薄膜质量有问题
(4) the quality of heat sealing film is defective.
封口封不上还与热封薄膜质量有关，如果复合里料电晕处理不均匀，效果不好，并恰好出现在封口处，肯定无法封口。这种情况很少见，然而一旦出现，产品必然报废。所以在彩印包装行业，是下道工序监督上道工序，一发现质量问题，必须及时分析起因并加以解决。
The sealing quality is also related to the sealing film quality. If the composite lining corona treatment is not uniform, the effect is not good, and happens to appear in the sealing place, it is certainly impossible to seal. This situation is rare, but once it appears, the product will inevitably be scrapped. Therefore, in the color printing and packaging industry, is the next process to supervise the last process, a quality problem found, must be timely analysis of the causes and solve.
如果封口处有水分、脏污，也会造成封口不牢。
If the seal is water and dirty, it will also cause poor sealing.
总之，解决第一种封合不牢问题，一般可适当提高热封温度，再降低热封速度，同时加大冷压胶轮的压力。
In short, to solve the first sealing problem, generally can properly increase the heat sealing temperature, and then reduce the heat sealing speed, while increasing the pressure of cold-pressed rubber wheels.
