In modern PET blow production, the processing of raw materials is crucial. PET plastic particles have strong hygroscopicity and are very easy to absorb moisture in the air. If these materials are directly processed without being fully dried, the moisture will evaporate during the heating process, resulting in a series of product quality problems, such as bubbles, hydrolysis reactions, etc., which will affect the performance and appearance of the bottle. Therefore, the use of dehumidification dryers can not only improve the quality of products, but also significantly reduce the defective rate and cost in production.
Common quality problems in PET blow bottles
The process of PET blow-blow bottles has extremely high requirements on the quality of materials. However, if the moisture content of the raw materials is too high, it usually causes the following common problems:
The surface is not smooth and there are bubbles:
Water will vaporize during the high-temperature melting process, generating bubbles, resulting in uneven and rough surfaces on the blown bottles, affecting the appearance and functionality.
1.Increased material brittleness:
Hygroscopic PET will undergo hydrolysis reactions at high temperatures, and the molecular chains will break, resulting in a decrease in the mechanical strength of the material, a significant decrease in the impact resistance of the bottle, and easy rupture or deformation.
2.Uneven color and decreased transparency:
The presence of moisture affects the fluidity of the molten material, resulting in uneven color of the bottle, especially in products with high transparency requirements (such as beverage bottles). Insufficient transparency will directly affect market acceptance.
3.Unstable bottle weight:
Moisture will cause the density of the material to change, resulting in inconsistent weight of each bottle, which is particularly unfavorable for production lines with strict quality control.
The importance of dehumidification dryers
In order to solve the above problems, dehumidification dryers are widely introduced in the PET bottle blowing industry. This equipment effectively removes moisture from plastic particles by reducing the humidity in the air, thereby ensuring the dry state of the material. Compared with traditional hot air drying, the advantages of dehumidification dryers are obvious:
Deep dehumidification: Dehumidification dryers can reduce the humidity of PET particles to extremely low levels (usually less than 0.02%), ensuring that the material can remain dry even in high humidity environments.
Constant temperature control:The equipment can maintain a stable drying temperature to avoid excessive temperature causing material degradation or over-drying.
High efficiency and energy saving: Modern dehumidification dryers are designed to be more energy-efficient. Through intelligent temperature control systems and circulating air technology, energy consumption is greatly reduced, helping companies save energy costs.
Benefits of Dehumidification Dryer
The introduction of dehumidification dryer has a positive impact on all aspects of PET bottle blowing:
Improve product appearance and performance: By eliminating moisture in the material, the surface of the blown bottle is smoother and flawless, and the brittleness caused by hydrolysis is also avoided, thereby greatly improving the impact resistance and service life of the product.
Improve production efficiency: The stable material state reduces the rework and scrap rate caused by quality problems, reduces downtime adjustment time, and significantly improves the overall efficiency of the production line.
Reducing production costs: Dehumidification dryers not only reduce the defective rate, but also reduce the energy consumption expenditure of enterprises through their energy-saving design. At the same time, due to its precise control of raw material processing, it can effectively reduce unnecessary material waste.
Improve brand competitiveness: High-quality PET bottles can better meet market demand. Whether it is food packaging or beverage bottles, the high requirements for appearance, strength and transparency can be met, thus bringing greater market competitive advantages to enterprises.
How to choose a suitable dehumidification dryer?
When choosing a dehumidification dryer, companies should make comprehensive considerations based on their own production scale, material characteristics, production environment and other factors:
Drying capacity: According to the production capacity and production speed of the blow molding machine, choose equipment with appropriate drying capacity to ensure that the material can reach the ideal moisture content before entering the blow molding machine.
Energy consumption and cost: Choosing equipment with low energy consumption and low operating costs can help companies reduce production and operating costs while improving product quality.
Intelligent control: Modern dehumidification dryers are usually equipped with intelligent control systems, which can automatically adjust drying parameters according to different raw materials and environmental conditions to ensure the best dehumidification effect.
Summary
In the PET blow molding industry, dehumidification dryers are not only key equipment for improving product quality, but also play an important role in reducing costs and improving production efficiency. By choosing a suitable dehumidification dryer, companies can effectively solve the moisture absorption problem in PET materials and produce high-quality bottles that meet market demand, thereby enhancing the competitiveness of the company and winning more market share.
