Extrusion 6-2018

GMA has launched the new three-layer composite hollow die. This die is designed with special flow channel, customers are able to save almost 50% outside layer material when applying on hollow board. Thanks for the micro-foaming technology, the loading capacity of the hollow board are not affected and material can be saved, customers’ produc- tion profit are increased. This design has been patented and used on extrusion lines, got unanimous praise from customers. tively save 50% surface material cost, with micro-foaming three-layer structure and production technology, the PP hol- low board will be more widely used. Af- ter continuous experiment and impro- ving, compared with PP hollow board, F rom simple single layer to multi-layer structure, from grid-shape, X-shape to irregular-shape design of hollow die, the technical difficulty of traditional hollow die is how to avoid surface indentation problem. For example, UV layer usually used on the surface of hollow board for anti ultraviolet and enhance weather ability, but the surface indentation will reduce the strength of the product and increase production cost. Few years ago, GMA group has successfully overcome this difficulty of hollow die, this techno- logy is used in producing both for PC hollow board with UV coating layer and PP two-color hollow board. Via GMA’s new hollow die, surface material can be saved about 15%. The PP hollow board is one of mature product and also price sensitive product at recently years. In order to increase cus- tomers’ profit, GMA developed this new hollow die, and it can help users to effec- 40 Periphery Extrusion 6/2018 New Three-Layer Composite Hollow Die launched the new PP micro-foaming hollow board is more light in weight, but the carrying capacity is the same, or even higher. This is breakthroughs of PP hollow board. On chart 1, from the compression test, we can see the carrying capacity of PP Picture 1: Traditional hollow die design is easy to get problem on surface indentation Picture 2: Three-layer micro-foaming hollow board made from GMA new patent hollow die Chart 1: Compression test, based on board thickness 4mm Max compressive strength (kgf) Weight of square meter Test #1 Test #2 Avarage value PP foaming hollow board 596 g 730 710 720 PP foaming hollow board 660 g 1030 999 1015 PP foaming hollow board 730 g 1490 1480 1485 PP hollow board 750 g 1050 1030 1040 Max kilogram-force (kgf)