Kan kulfibervarmerør forbedre blæsestøbemaskiner?

Plastic bottles are now widely used across various industries in daily life, including the beverage industry, daily chemical industry, food industry, household goods industry, and pharmaceutical and chemical industries. Plastic bottles have become the dominant type of container in contemporary society, having long replaced traditional glass or metal bottles. The production of plastic bottles requires PET multifunctional blow molding machines. The working principle of the blow molding machine is to heat the plastic preform to a certain temperature, and then use a special process to blow it into the desired shape and size. So, can Varmerør af kulfiber be used in blow molding machines? The answer is yes.

Almindelige varmerør i blæsestøbemaskiner

I øjeblikket er de mest anvendte varmerør i blæsestøbemaskiner infrarøde varmerør med wolframfilament. Infrarøde varmerør har dog en ulempe: På grund af at wolframfilamentet langsomt sublimerer ved høje temperaturer og reagerer med spor af ilt i beskyttelsesgassen, vil varmetråden med tiden brænde ud, hvilket er et uundgåeligt problem.

Hvorfor kan kulfibervarmerør bruges i fuldautomatiske blæsestøbemaskiner?

1. Lignende form og struktur:

Varmerør af kulfiber share the same shape and structure as infrared heating tubes. Both have similar external structures and materials, which can be made from either transparent quartz tubes or ruby quartz tubes. All the advantages of infrared heating tubes, such as acid and alkali resistance, high temperature tolerance, quick startup speed, and low thermal inertia, are also present in carbon fiber heating tubes.

2. Forskelle i varmeelementer:

The key difference lies in the heating element material. Infrared heating tubes use tungsten filaments, while Varmerør af kulfiber use carbon fibers. Carbon fiber is a new material that has gained popularity in the last decade due to its excellent physical and chemical properties, and it is widely used in various fields. The biggest advantage of carbon fiber over tungsten filament is that under the protection of inert gas or in a vacuum environment, the physical properties of carbon fiber are much more stable—several times more stable than tungsten filament. This means that as long as the vacuum environment is maintained, carbon fiber heating elements can operate continuously, a significant advantage that tungsten filaments cannot match.

3. Spektral ydeevne:

Infrarøde varmerør med wolframfilament kan efter justering med eksterne kvartsrør eller andre parametre styre bølgelængden mellem 1,06-1,2 µm. I modsætning hertil har kulfibervarmerør et strålingsområde på 1,5-15 µm. Dette bølgelængdeområde har et større overlappende område med det infrarøde spektrum, der absorberes af de funktionelle grupper i plast, og derfor bruges der ofte infrarøde spektrometre til analyse af plastkomponenter. Derfor er kulfibervarmerør mere velegnede til opvarmning af plastdele.

Selvom infrarøde varmerør i øjeblikket fungerer ganske godt, og det er grunden til, at mange producenter ikke har introduceret nye blæsestøbemaskiner til kulfibervarmerør, er de største bekymringer varmeeffektivitet og levetid. Disse bekymringer er dog stort set unødvendige.