Below Are Frequently Asked Questions, You May Find The Answer For Yourself
What is the smallest screw you can manufacture?
What is the largest screw you can manufacture?
What is the longest screw you can manufacture?
What is the fastest time you can get a screw manufactured?
It depends on size, profile, etc. Here is an example: for a 80mm, 24:1, mixing section, hard-faced, no chrome plating, it would be 14 working days.
How much experience does JINYI and its staff have in the screw and barrel business?
JINYI was founded in 1992. Most of its employees have 5-10 years experience in the industry.
How do you guarantee your quality?
JINYI is a ISO9001:2015 qualified screw barrel and accessories manufacturer. We have a complete inspection and testing procedure according to the standard, coupled with the advanced testing equipment, including CMM (3D coordinate measuring machine), roughness tester, metalographic tester, hardness tester, electronic auto-collimator, ultrasonic detector, film thickness tester, etc.
Nitrided vs. Bimetallic Barrels:
If straightness of the barrel tube is a prerequisite for good performance and long wear life, the selection of the bore lining material is equally as important. Clearly, the bore of an unprotected plain steel barrel will deteriorate quickly when the processor molds abrasive or corrosive plastic resins.
Nitriding the barrel is a common and cost-effective treatment of the barrel bore if the resin to be processed is only mildly abrasive and not corrosive. Not knowing the types of resins a processor may run, many machine builders select nitrided barrels as their standard for their new off-the-shelf equipment, only to exchange this type with a higher-priced bimetallic barrel for superior wear and output performance when the customer demands it or the processing application requires it.
However, high-performance barrels with superior output and long service life require more than a thin nitrided bore surface. The potential for contact between the rotating screw and the barrel bore and the effect of heat, abrasion, and possibly corrosion, make it necessary that the barrel bore is well protected. Bimetallic barrels feature a super-hard or anti-corrosive protective layer in the bore that is applied there through a complex process involving high heat and centrifugal forces.
Are bimetallic barrels better or equal to nitrided barrels?
It depends on the type of materials used in the centrifugal casting, the exact type of nitriding process and under what specifications they are implemented. We would be happy to advise you which would be better based on you specific requirements.
What is your warranty?
We guarantee newly manufactured products for workmanship and material defects for a period of 12 months from installation, or 18 months from delivery, whichever occurs first. JINYI is not responsible for damage caused by misuse, improper storage, installation, customer handling or vandalism.
Are barrels an industrial commodity?
Hardly! As there are no specific industry-standards for barrel and screw configurations, each machine builder develops barrel configurations that suit his particular needs for fitting the barrel to his extruder or injection molding machine.
There are thousands of different barrel designs in use today; many of them have spawned further modifications at the user level to suit the needs of particular processing applications.
Keeping track of all these different designs, and providing the buyer with exactly what he/she wants is a daunting task for the barrel manufacturer that requires an extensive technical drawing library and dedicated, knowledgeable staff to research the information on behalf of the buyer.
Considerations for Barrel straightness:
One of the most important aspects of a high-quality and high-performance barrel is straightness. Nothing affects barrel and screw wear as much as straightness, or the lack thereof.
For example, to make a long and straight barrel is not an easy undertaking for any manufacturer. Starting with different interpretations by barrel makers of the requirement for straightness, some will abide by the straightness standards.
What about repairing or re-sleeving worn barrels?
Depending on the severity of the wear or damage in the barrel bore, it may be cost-effective to have the barrel repaired or re-sleeved (i.e. removing the worn bore section and inserting a sleeve featuring the same protective bore lining material as the original barrel).
As re-sleeving will be considered primarily for injection molding barrels with their inherent high pressure operating conditions, the user is well advised to have this work done by qualified shops specializing in barrel repair.
Such reputable repair shops for barrels will advise the customer about the pros and cons of repairing or re-sleeving his damaged or worn barrel versus buying a new one.