Blow Mold,Pet blow,Blow mould manufacturers,Blow molding companies
We also Specializes in high-quality blow mold and pride ourselves in having a team of highly experienced designers and Blow mould manufacturers who are committed to excellence. Many of our employees have been in Pet blow mold industry over 20 years for
- Extrusion Bottle Mold
- Injection Blow Mold
- Stretch Blow Mold
Our blow mold material:
- aircraft aluminum : 6061 and 7075
- P-20 tool steel
- stainless steels：DIN 1.2316
- Hot and cold filled beverage containers
- Household product and food containers
- Alcohol beverage containers
- Soft drink containers
- Motor oil containers
- Dairy Containers
- Tool cases
- Toner pet blow bottles
- Two component paneling
- Entertainment products
- Pallet systems
- Fluid containers –
windshield washers, coolant overflow
- Air induction systems
- Various underhood components
- Insert molding
- Floor panels
PET blow mold:
Quality Control for Blow Molding Companies
The end use of the blow-molded bottle usually dictates the extent of inspection carried out on the item. The fields of toys and housewares are somewhat less critical, and the major controls deal with weight, general dimensions, color and rigidity.
Industrial parts and blown containers require much more rigorous testing and inspection and consequently dictate the need for quality control during manufacture. On this premise, we will review basic quality control and its use for the blow- molded container industry.
These pertain to stress- crack resistance, permeability, wall collapse, impact strength and product change, and it must be assumed that these basic points are met by the container.
It must also be established that these tests have been successfully run on production bottles, not just on test containers made to obtain the job. With these facts behind us, we must investigate the need for and the use of quality control.
Inspection Quality control techniques should not be confused with product inspection, which consists merely of screening the items produced and comparing the findings with established specifications to see whether or not the product meets them.
If the item is within specifications it is accepted, and those that do not meet them are rejected. Unfortunately, this is almost like locking the door after the horse is gone, because the damage is done. In addition, this form of product testing is extremely costly and involves considerable labor and materials and does not explain the cause of the problem.
We do not believe that today’s blow molder wants to rely simply on inspection of his product. There are numerous improved techniques that should be investigated; if used properly, these will result in increased machine, material and manpower efficiency.
Control The key to the use of any technique in bottle blow molding is the control it gives of the product produced. To use quality control properly, it must be a part of the manufacturing process and must yield a positive method of control on the items being manufactured.
When this control exists, the processor or fabricator can set the degree of quality desired for a specific customer and can govern his operation to yield these results on a consistent basis. Undoubtedly if one asked a customer what degree of quality he desired he would state 100 per cent. Of course, this is impossible, even though used as a goal; everyone must settle for less than perfection.
True quality control is in fact based on the production of some marginal or off-standard products. Control of quality is obtained by measuring quality of production at the machines. This allows immediate knowledge of the quality status and allows machine adjustments to be made if necessary.
Control is also offered to the end user through quality control techniques, since it assures him of an improved product, and also allows him to better appraise his line. The evaluation of production lots is handled by a sampling method for checking visible and functional defects.
The use of sample lots is common to process quality control as well as incoming quality control at the bottle decorator or filler. Specifications The degree of quality control desired must be established between the bottle producer and his customer. In addition, the specifications on which quality control are based must be established prior to a production job.
From these specifications the processor can set his control limits. The limits agreed to are based on product requirements and are determined from what the bottle container is expected to do. The use of specifications is necessary, since it eliminates much of the human judgement or sometimes guess-work involved in interpreting good or bad quality.
In many industries specifications have been derived from long-standing practices which have been judged fair. In plastics there has been insufficient time to establish historic specifications, and it is sometimes difficult to arrive at definite figures. It must be remembered that specifications are in reality permissible variations in the product and are, therefore, yardsticks by which to measure quality.
In judging the quality against a specification we must consider all parts of the container and all types of possible defects. Specifications can, therefore, be divided into several classifications depending on whether they are in the form of actual measurements or are handled as visual controls. In addition, some of the defects may be hidden in the container and can only be appraised by some form of destructive testing.