PP Form & Availability
HMC Polymers delivers materials to our customers in Thailand, Asia and worldwide. Our PP resins are usually shipped as natural, uncoloured pellets, available in a range of packaging options dependent on shipping, volume and destination.
Storage and logistics
In addition to our large customer base in Thailand, we offer customers a comprehensive global logistics service exporting to regional locations in Asia and around the world, facilitated by the vicinity of Laem Chabang’s world class shipping port which can accommodate deep-sea vessels.
HMC Polymers’ products are stored, distributed and delivered following state-of-the-art processes to ensure the highest standards. Our polypropylene resins are usually sold as natural, uncoloured pellets, available in a range of packaging options including 25 kg. bags (with or without pallets), jumbo bags, bulk containers or bulk trucks.
The original packaging of the polypropylene provides a high level of protection against the ingress of moisture and dirt. Pre-drying is usually not necessary, but under certain climatic conditions such as large temperature differences coupled with high atmospheric humidity, moisture may condense inside the packaging.
It is therefore recommended that in accordance with good practice, warehouse and storage areas be adequately ventilated. In addition, experience shows that it should also be sufficient to place the material into the same climatic conditions as the molding machine prior to conversion.
Exposure to UV radiation and to high temperatures during storage can damage the product. It should therefore be protected from direct sunlight and temperatures above 40° C.
Compatibility and miscibility
pelletised resins are in principle compatible and miscible with one another and with other polypropylene grades of the same general type.
However, due to the relatively limited homogenisation capacity of many injection molding machines it is recommended that unduly large differences between the melt viscosities of blend components should be avoided. Blends of polypropylene with other thermoplastic materials should also be avoided.
On those occasions when coloured packaging is required, the pigmentation will usually involve the use of a masterbatch.
It is essential that all components of the masterbatch should comply fully with the requisite regulations and particularly those covering use in contact with food. In addition, it is recommended that the pigment carrier is either based on a polypropylene, or that it should be fully compatible with the material being coloured and should exhibit a lower viscosity (higher melt flow rate) as the polymer to be coloured. In addition, all pigments should be sufficiently heat stable.
In certain cases, production scrap such as sprues and reject moldings may be recycled in the form of a blend with the virgin polypropylene. However, the use of such material is dependant upon the conversion process and the final application, and on any specific performance requirements.
Such material needs to be re-granulated so that it may be blended back with the virgin granules. It is important that the viscosities of the virgin and the scrap materials do not differ excessively, and that the regrind material is clean and has not been thermally degraded. Furthermore, European regulatory bodies have introduced severe restrictions on the use of regrind material in direct contact with food.