KAWATA Dehumidifying Drying Machines                                 For Medical applications

DFC Series

All parts where the material contacts are stainless steel specifications

  • Comparison of molds with short shot defects due to mold stains when using the interceptor

Without Interceptor
(Use raw material : PBT)

With Interceptor
(Use raw material : PBT)

It has been proven that the interceptor is effective as a measure against mold stains.

Time and cost required for mold maintenance

These numbers may vary depending on your usage time and usage.

Analysis of gas generated when resin melts

Mold smudging or die fouling can be significantly reduced

table 7-6-22.JPG

Photograph of an interceptor at a customer making auto parts in Georgia

questioning.jpg

Why manufacturers cannot produce products in the same way...

Why productivity differs depending on the region/equipment...

Why is it bad if the material contains water...

Why adding heat to the material in the dryer...

What can we do with Auxiliary equipment?

  • M-STABILIZER-

                       <Stable Molding Technologies>

benefit1.jpg

For stable molding to make quality products, we require a molding machine, a mold, and durable resin raw materials. Most of the causes of defects can figure out by the mold and the molding machine that we can assume. However, if the condition of the resin supplied to the molding machine is not stable, the production will not be steady.   For example, if the resin's moisture content becomes unstable, the melt viscosity becomes unstable. Also, gas is generated, and the molding defects such as the silver streaks are caused. As a result, the molding conditions must be changed.

benefit2.jpg

The only thing that plastic auxiliary equipment can do is stabilize the moisture level and stably supply materials with less dust, which is the most important thing.

benefit3.jpg

So what are the factors that make it unstable?

The first is the storage condition of raw material tanks, etc. This is a part that is often overlooked.

The second is the conveying method from the dryer to the molding machine. Moisture may be absorbed immediately after conveying materials to use outside air.

The third is the residual materials inside of the molding machine or the piping. 

benefit4.jpg

The sealed raw material bag is stored at a constant moisture level. The condition will change immediately after opening. The graph is expressed with the image of nylon, which has high hygroscopicity, but other materials are also the same. It will change significantly depending on the environment in which it is placed.

benefit5.jpg
benefit6.jpg
benefit7.jpg

The dew point goes up and down means that the content of caution changes depending on whether it is cold or hot. Also, if the dew point is close to 20 ° C, it will absorb moisture shortly. 

benefit8.jpg

What changes when the initial moisture is different is that the drying time and the reached moisture content will be change. A dryer is a device that can remove a certain amount of water in a certain time.

In other words, if the condition of the feeding material changes, the moisture content of the discharged material will change. Therefore, it may be one of the causes that silver streak suddenly occurs during continuous production, and the conditions become unstable. Excessive moisture causes silver streak, which is a problem, but if it is dried too much, the melt viscosity will increase, causing short shots and gas generation.

benefit9.jpg

What is happening on the molding machine?

It cannot be dried to 0ppm with a dryer.

When you enter the barrel, which is hotter than the dryer, drying will be accelerated.

Then, the moisture that has no escape is exhausted from the material supply port.

In addition, conveying materials with outside air or undried air may cause moisture absorption, and it may stay in the piping and absorb moisture when it cools.

Furthermore, suppose materials stay in the molding machine hopper for a long time. In that case, they will cool down and be added alternately with the material immediately after drying, which is one of the causes of unstable melt viscosity.

benefit10.jpg

If the initial moisture is not controlled, the condition of the material discharged from the dryer will change significantly. If the retention is long, the moisture content will change gradually.

Therefore, Kawata has some suggestions.

benefit11.jpg

Next, there is the DO-series as a representative device of M-stabilizer technology.

Dry with nitrogen in a closed system.

Regarding nitrogen, we will generate nitrogen air inside the equipment by providing air from the customer.

The big difference from the conventional nitrogen dryer is that the drying air's nitrogen concentration is about 99%.

Besides, by using a closed nitrogen purge tank as the raw material tank, the condition does not change even if it is stored and conveyed.

benefit12.jpg
benefit13.jpg
benefit14.jpg

As shown in the above figure, it is a method to separate the adhering powder while the materials turn around the particular filter part.

It is a continuous method in which materials are conveyed and supplied from the top.

Although it is small and compact, but it has excellent capabilities.

Also, large long film-like products such as floss cannot be removed.

High-performance Plastics Expo
2019 Technical description

DO Series

DT Series

XF Series

Drying device for optical film                       (It can be used for any type of LCD)

Xeno filter

XF series

Removes fine powder and foreign matter by centrifugal force improves forming trouble

  • High-efficiency removal of delicate powder / foreign matter by centrifugation using transport air as driving force

  • It can be installed on the equipment and the existing conveying hopper. 

  • Easy to disassemble / clean with simple structure

Special filter <Xeno filter>

XF VIDEO

Commonly shaped filter

We have the XENOFILTER at the Illinois office. If you would like to try this, please contact us. 

XF Series

  • MTC Guide

JUSTTHERMO series
TW/160・180

Medium : Freshwater
Temperature: Max160・180℃ (320/356℉)

Best match for molding of electric molding machines, PPS, SPS, Ultem materials

Adjusting the pressure brings the water to a high temperature

Saturated vapor state

Reference by engineeringtoolbox.com

Material for MTC.JPG

Color Sort

High-Definition Color 

Separator for Pellets

 

 Related Products 

  Kawata Japan published the new model of the mold temperature controllers from IPF Japan. 

   

Kawata Shanghai published the new model of the mold temperature controllers

Wind Brush

Easy filter cleaning is easy!

  • Easy automatic cleaning by air flow

  • It does not damage the filter

  • One-touch attachment and removal

VIDEO

Filter Cleaner

 

eco.jpg

The best energy saving is to reduce defects,

By reducing production loss and

Consider reducing throughput time.