In the recent high prices of raw paper and in short supply, we can not improve the compressive strength of corrugated boxes by increasing the basis weight of raw paper. This requires corrugated box enterprises to do process control in corrugated board processing, and to process corrugated board. The reduction in compressive strength is kept to a minimum, enabling it to maintain an inherently stable compressive strength.
The printing process of corrugated boxes mainly includes pre-printing, watermarking and offset printing . Practice has proved that the same corrugated box, the pre-printing process of the box is the best compressive strength, followed by the watermark, and finally the offset printing. The process control of the three processes has the same and different aspects.
Watermarking process
The control of the production cycle of watermarked corrugated board is very important. If the production cycle control of the watermark corrugated board is unreasonable, it is empty talk about the so-called decompression printing. The production cycle, that is, the time when the three-layer corrugated cardboard is discharged from the corrugated machine to the watermarker. Reasonable control of the production cycle is a prerequisite for improving the quality of watermark printing, reducing printing pressure, and increasing the compressive strength of corrugated boxes. Because the three layers of corrugated cardboard are in the process of bonding, the moisture in the adhesive will penetrate into the base paper, causing the corrugated board to absorb moisture and become soft. When the moisture and adhesive in the corrugated board have not been dried thoroughly, the machine will be printed immediately, and the printing gap will be adjusted. The printing pressure will increase, which will crush the corrugated and reduce the compressive strength of the box. Therefore, only by properly arranging the production cycle of the watermark corrugated board can the printing pressure be reduced and the compressive strength of the box can be guaranteed.
Table 1 shows the test results of our company for the same corrugated board stored in the same environment. It can be seen that the shorter the storage time of the corrugated cardboard, the smaller the gap value between the printing cylinders, in other words, the greater the printing pressure, the lower the corrugated cardboard height, and the lower the compressive strength of the box.
Table 1 Test results of the same corrugated board stored in the same environment It should be noted that when the environmental humidity of the production workshop is higher than 70%, the production cycle is not easy to exceed 16 hours. Otherwise, in the high-humidity environment, the corrugated board will absorb moisture and moisture, resulting in an increase in water content and a decrease in the compressive strength of the box. Therefore, after the corrugated cardboard is formed, it is immediately entangled and shipped into the warehouse.
Preprinting process
The pre-printing process is the process in which the process steps in the corrugated board processing process are the least, and the loss of the boxed compressive strength is the smallest. However, if the die-cutting process is poorly controlled, the compressive strength of the pre-printed corrugated box may still be unsatisfactory. This is mainly because there are two key points for pre-printed corrugated boxes, one is the quality of the corrugated board, and the other is to avoid the damage of the compressive strength of the corrugated board by the die-cutting machine (mainly the gap value of the paper exit roller and Die-cutting pressure on the corrugated board). When the corrugated cardboard is bent or the corrugated cardboard is different in size, the paper is skewed, and the die cutting is not correct, the operator generally adopts a method of reducing the value of the paper discharge gap. In fact, although the problem of paper deflection is solved, the corrugated cardboard is Corrugated will be crushed and the compressive strength will drop significantly.
When it comes to removing unwanted hair, you have options. With so much misinformation available about these options, it can be difficult to know which one(s) is best for you. To help you make an informed decision, here are the basic facts that dermatologists share with their patients about 7 popular ways to remove unwanted hair.
Shaving
When you shave, the razor cuts the hairs at the surface of your skin so that you cannot see the hairs.
Fast facts: Here are the long and short of shaving:
You can shave any area of the body.
You can quickly learn how to shave.
Shaving is painless (unless you cut yourself), unlike waxing or laser hair removal.
The results are short-lived, so you may need to shave daily or every few days to maintain your results.
Frequent shaving can irritate your skin.
Injuries, such as cuts, nicks, and razor burns, happen.
Some people who shave develop ingrown hairs.
How to get the best results: The following tips from dermatologists can help you reduce injuries and get a close, comfortable shave.
How to shave: For men and women - Discover 6 simple steps that can help you get a clean, comfortable shave and minimize irritated skin. (video)
How to shave your face - Men, using the right technique can go a long way toward getting soft, smooth, and hairless skin. (video)
7 ways to prevent injuries while trimming pubic hair - Find research-proven ways to reduce these all-too-common injuries.
Waxing
You apply wax (hot or cold) to your skin and then quickly remove it, which pulls out the hairs.
Fast facts: Here are the cold facts about this option:
The results can last a few weeks or longer.
You can wax any area of your body, including large areas, such as your legs, and delicate areas, such as the skin above your upper lip.
Waxing takes practice to learn.
Removing the wax can be painful.
Your newly waxed skin can be red and irritated for a short while after you wax.
If the wax is too hot, it can burn your skin.
How to get the best results: These dermatologists` tips can help you keep it safe and effective:
Waxing is not recommended if you are currently:
Taking isotretinoin (a prescription medication approved to treat severe acne) or have taken it within the past 6 months.
Using an antibiotic
Applying tretinoin (also known as retinoic acid) to your skin.
These medications thin your skin. When the wax is removed, your skin could tear.
If you wax at home, be sure to see what dermatologists recommend by watching this short video, Hair removal: How to wax.
If you go to a salon for a wax, make sure the estheticians:
Use wooden sticks rather than a metal spatula to apply the hot wax.
Dip an unused wooden stick into the wax each time they apply wax to your skin.
Dipping the stick into the wax more than once is called double dipping. This unsanitary practice can transfer bacteria and other germs from previous clients to you. Heated wax is not hot enough to kill bacteria and other germs.
Depilatories
You apply a cream, lotion, or gel to the skin, which can dissolve unwanted hair.
Fast facts: The following can help wash away any misconceptions about using a depilatory:
The results tend to last longer than when you shave.
It`s quick and easy to use at home. You simply apply, wait, and rinse off the product at the time stated in the instructions.
These products can irritate your skin, so dermatologists recommend that you test them. (instructions below under How to get best results from a depilatory).
Some people can use a product for months or years before it starts to irritate their skin.
Some people dislike the odor of these products.
How to get the best results from a depilatory: Always, test first. Before using a depilatory for the first time or using it on a different part of your body, here`s how to test the product:
Apply a small amount to an area on which you want to use it.
Keep it on your skin for the time stated in the instructions (or until your skin starts to burn or sting).
Rinse it off immediately and thoroughly at the time stated or at the first sign of burning or stinging.
If you experience burning or stinging, don`t use the product. Find another depilatory to test.
If within 24 hours of applying the product you don`t have a skin reaction, you can use the product in that area.
China Depilatory Suppliers
DELIN HAIR COSMETICS , https://www.arganshampoofactory.com