A chair mould will be influential to produce final chairs. But how to manufacture chairmoulds? It may become a big problem. During the process of manufacturing chair mould, many factors should be taken into account.
Manual operation in the parting line will be easier to cause asymmetrical wall thickness. Of course, most of the reasons are due to the bad 3D design and bad polish of the cavities and cores. Thus, when we begin to design a chair mould, we should take the wall thickness into account. Sometimes, we will have to make much thicker in some areas in order to assure the strength of the chair. But we also should be more carefully if we adopt this method. As we know, asymmetrical wall thickness will lead to the asymmetrical injection, cooling asymmetrical, accordingly. And then it will slower the speed of injection and result in epitome simultaneously. If the process of CNC milling is not very accurate, you cannot get a chair with symmetrical wall thickness.
How to assure the chair has enough strength but light？
We should consider the weight and strength of the chair when we design the chair. You can make the bottom of the chair much stouter by increasing more reinforcing ribs. How about the chair feet, back of chair and cushion. As for this, you should analyze force of every area. In order to make the light chair with good strength, PP will be best choice.
How to design good venting system on the back of the chair?
The back of some chairs are more complicated because they have many plastic weld. It may cause bad venting when filling the material and plastic flow. We need to use moldflow analysis to estimate whether the certain areas of mould need venting system or not.
How to assure the durability of the chair mould?
We should assure the steel material has been plated chromium in order to prevent the cavities and cores from being corroded by plastic. Provided that you want to use return material, the chair mould must be chromium plated. Otherwise, the mould needs to be polished frequently.
Welcome to Chinese professional plastic injection mould manufacturer——Sino Mould. We have a full-equipped factory in Southeast of China, Huangyan. We have much experience in this field. If you are interested in our products, please don’t hesitate to contact us for molds and any other plastic molding service.
sinomould-17
