To be precise, Sun Haibo and Ye Ran's test method belongs to Ye Luzi.

After the sunscreen cooling coating is produced, professional inspectors will send it to the laboratory to conduct the most professional testing on the temperature range, adhesion, tensile strength, ductility, thermal conductivity, thermal reflectivity and other indicators of the coating.

It doesn't need to be exposed to the sun at all, just by its thermal conductivity, heat reflection and emissivity, you can accurately calculate its heating coefficient in the sun.

But there is a joy in the wild road.

Today's temperature is also approaching 40 degrees, Sun Haibo and Ye Ran are hiding in the factory on the side, blowing the air conditioner, chatting and waiting.

didn't wait for half an hour, and after more than ten minutes, Sun Haibo was a little impatient.

He ran out with a thermometer and measured the sunny side of the coating.

Twenty-eight degrees!

"Oh my day, so amazing?"

Sun Haibo touched it with his hand without believing it, and the surface of the coating actually gave him a cold, silk-like cool touch.

Why did the rich like to wear silk clothes in ancient times?

Because silk is nature's best sunscreen and summer textile, silk not only has good heat dissipation and moisture wicking properties, but also because each silk fiber is extremely fine, only one-tenth the thickness of a human hair.

Therefore, when silk is dehydrated and woven into silk, its weaving density is also the highest among all textiles, and it can play a very good role in sun protection in summer.

But the coating in front of me, in terms of heat reflection and thermal emissivity, completely kills silk.

After another twenty minutes, Sun Haibo measured its surface temperature again.

Twenty-nine degrees eight, not even more than thirty degrees.

By the time the staff brought the 4X4 coating into the factory, there was no direct sunlight and no heat in the outdoor air.

In just three minutes, the surface of the coating cooled down to the same level of 27 degrees as the interior.

This seems to defy common sense in physics.

But that's science and technology.

Technology cannot break the second of the three laws of thermodynamics: heat can be transferred spontaneously from high-temperature objects to low-temperature objects.

But technology can greatly slow down the efficiency of this heat transfer.

The source of outdoor heat is mainly sunlight, and as long as the material itself has a high reflective effect on sunlight rays, it becomes extremely difficult for sunlight rays to heat up the material.

If the material itself has good heat dissipation properties, it will also take a long time for the outdoor ambient temperature to warm up to the same ambient temperature.

After Sun Haibo was surprised, he called three more workers, one of whom picked up the corner of this sunscreen coating, and then the four of them worked hard to try the tensile resistance and elasticity of this coating.

The strength of the four big men is naturally ridiculously great.

Thanks to their efforts, the sunscreen coating was quickly pulled into a translucent "plastic film".

But they all pulled the coating from 4x4 to nearly 10x10, and still couldn't pull it up.

It is only 0.04 mm thick, and under the pull, it slowly changes from translucent to almost transparent, and the thickness is even smaller to exaggerated.

"How is it the same as Okako 001?"

One worker smiled a little yellow, "This elasticity is amazing, 0.04 mm, and we men can't break it." ”

"I'm tired, I'm tired, I'm not doing it." Another worker laughed.

The four of them slowly returned to their original position, and the coating in their hands returned to its original 4X4 size.

As a result, the surface of the coating does not have any stretched folds, let alone deformation.

……

This integrated factory of Zhenheng Shuangke is mainly engaged in the production of chemical fiber textile fabrics.

After everyone made a fuss about the coating material for a while, Sun Haibo, the person in charge of the factory, instructed the technicians to carry out the hot-pressed coating process of sunscreen coating and textile fabrics.

The technical difficulty of textile fabrics is not high, and the factory does not need to make equipment adjustments to produce them directly, and it only takes half a day to produce the order quantity specified by Two Angel Technology.

Therefore, the hot-pressing and laminating process of sunscreen coating and textile fabrics is also the final process.

When this step is completed, the fabric of the sunscreen clothing can enter the garment production process.

At half past five in the afternoon, the hot-pressed laminating process began.

There are usually three types of hot-pressed lamination processes, one is continuous film technology driven by rollers, and the other is pre-applied film technology that requires gluing.

The third type of laser lamination technology is used here, which is not available in most textile factories.

Two laser-heated prisms with precisely controlled temperatures heat the coatings and textiles to different temperatures.

The rollers then rotate to press the coating and textile together so that they are thoroughly bonded together.

In the first two technologies, only the coating and textile that need to be pressed can be heated to the same temperature.

However, on this sun-protective garment, the heating temperature required for the textile and the coating is not the same. The coating must be heated to 120 degrees because of its higher melting point, and it cannot be heated as a whole.

The overall heating coating will melt and only the surface can be heated on the side that adheres to the textile.

The thickness of the coating is only 0.04 mm, and it heats the surface layer quickly without allowing too much heat, which shows how difficult it is.

Fortunately, there is laser heating technology.

Ye Ran and his entourage all brought protective goggles, and when this process began, in the laser hot pressing and laminating equipment, two white laser lines representing different temperatures swept over the coating and the surface of the textile underneath.

Under laser irradiation, the surface of the coating and textile rapidly heats up, and the surface is shallow, and begins to melt from a solid state to a liquid state.

The front end rotates up and down the rollers to firmly press the two materials together and cool the material.

The sunscreen coating is the appearance of the breathable strip after being cut by the vibrating knife CNC cutting machine, and the position of the breathable strip will also be deliberately avoided on the surface of the textile during the laser heating process.

Laser hot lamination is ultra-fast.

On average, it takes two seconds to heat press a sunscreen coating and a textile fabric.

With protective goggles, Ye Ran saw that the outside world was dark red, only the two lasers were white.

In less than 20 minutes, all the 500 coatings and textiles prepared were hot-pressed.

Ye Ran and his entourage simply didn't leave, and directly transferred to the sample trial production workshop after dinner in the factory, and watched the workers make sunscreen fabrics into sunscreen clothing on the spot.

The real civilian clothing production workshop is on the side of the headquarters factory.

But there is no problem at all with making some civilian clothing on a small scale here, and it will only be more efficient than the outside world.

Because there are vibrating knife CNC cutting machine tools, as well as intelligent cloth feeding lockstitch sewing machines, chain lockstitch sewing machines and many other clothing production equipment.

The production of ready-to-wear garments is the least technical part.

It all depends on the scale.

In the laser lamination process, each 4X4 sunscreen coating is pre-cut with 4 pieces of garment breathable strips.

When it was sent to the trial production workshop, 500 pieces of fabric were put together, and the vibrating knife CNC cutting machine was like a flowing cloud, and it was cut into all the fabric structures needed for the garment.

Cutting is the first and most important process in garment making.

The cutting technique directly determines the quality of the version of a garment, as well as the fineness of the seams.

Why some skirts and pants can be bought online in twenty or thirty.

Because it's shoddy.

In order to save costs, those small factories directly asked the master to use chalk to directly draw the plane structure of the clothes on hundreds of layers of fabric.

Then he pushed an electric cloth cutter suspended by rope to cut these hundreds of layers of fabric by hand.

Can you imagine the size of the fabric cut out in this way?

Does the sleeve neckline guarantee that it's a straight size, not twisted?

Hand-cut cloth, the electric cloth cutter is a reciprocating saw structure, and the raw edges cut can be used as carpets.

When sewn into clothes, the slag is removed as soon as it is washed.

The price is of course cheap.

The most common computerized automatic cutting bed costs hundreds of thousands, and now the one that cuts sunscreen fabrics is worth more than five million.

The dimensional error between the cut fabric and the sample drawing shall not exceed 0.02 mm.

This 0.02 mm is still the deformation of the fabric itself after it has been cut.

The following garment process, Ye Ran is very familiar with it.

After the vibrating knife CNC cutting machine cuts all the fabric structure, the workers stack the fabrics of each garment together according to different parts, and then distribute them to the workers who are responsible for the corresponding sewing process.

"Dada~"

With a slip of the sewing equipment, an unfolded sleeve fabric is sewn together.

Slip a little more, and there is an extra row of zippers on the fabric......

Ripe and ripe, Ye Ran still watched it with relish.

It only took a few minutes for the first sunscreen suit to be basically sewn.

It is still a semi-finished product, and the logo and cuff hat have not yet been sewn.

But it can already be worn on the body to protect from the sun.

When it was dark, Ye Ran and his entourage returned to the company.

On the back seat of Vito, there are already a thousand pieces of finished sunscreen clothing printed with the LOGO.

Next to the sun-protective clothing, there is a stack of packaging ziplock bags.

The integrated factory will not be responsible for the production of ready-to-wear in the future, and from tomorrow, it will send the sunscreen fabrics produced to the headquarters civilian clothing production workshop more than ten kilometers away.

"Let's work overtime tonight, and we'll put sunscreen clothing on the shopping cart tonight." On the way back, Ye Ran rubbed his hands.

The three employees also turned their heads from time to time and looked towards the sunscreen clothing in the back seat.

They're going to have a big fight tonight.

Let those bloggers who look down on them see what technology is.