Compression Molding
July 11, 2011
Compression Molding is the original production method for molded rubber. It is a useful molding process for forming bulky parts, bellows, grommets, gaskets, seals and O-rings, etc. It is a widely used, efficient, economical production method for many products particularly low production volumes of medium to large parts, materials with a high cost and applications that demand extreme hardness. The process involves compressing preformed rubber in a mold with a press. During the compression process, rubber is forced into the mold cavity to form the final product.
Advantages
Compression Molding is more economic than rubber transfer molding and LSR injection,and the compression molding process is quite simple when compared to LSR injection molding.
Compression molding is a low-cost process and can be used for both low&high demand production.
Short set-up time, easy to change material's hardness & colors quickly.
Compression molding is the only way to product silicone products in Marble colors.
The tolerance can be controlled at 0.02-0.1mm by using good steal material, good located pins and good mold-making equipment.
Compression molding has more material options: common silicone, food grade silicone, medical grade silicone, natural rubber, EPDM,Neoprene Rubber,Nitrile Rubber,etc.
Material
EPDM,NBR,SBR,NR,Silicone(VMQ),Neoprene(CR),HNBR,XNBR,FKM,FFKM,FVMQ,FLAS,PTFE,PU,ECO,IIR,ACR,ect...
Tolerance Standard
We can make the parts according to your required tolerance. If you don't have special requirements on the tolerance, our tolerance is according to ISO3302:2014 CALSS2 as below.
Surface Treatment
With compression molding, we can make the surface as matte,texture, common polishing, mirror polishing,laser engraving,power coating, printing,segment colors,glowing in darkness color, uv color and mix colors.
INO Technology highly welcome you to make the custom surface treatment for silicone parts.
Process Flow Diagram
Once the order is confirmed, our engineer will provide the DFM report (Design for Manufacturability Analysis) to customer for approval.
We’ll start to design the mould drawing and mould making after the DFM report approved by customer.
Once the mould making is finished, we’ll make several pieces of pre-production samples for test.
If the dimensions are correct, then we will send the samples to customers for final confirmation.
If the test failed, we will modify the mould or adjust the molding parameter to make new samples, and test it again.
Once the samples are approval by customers, we will purchase the raw material and making quality inspection.
Then mixing material, molding and trimming, we will make many times of inspection during the production.
Finally we will arrange the assembly and packing.
After the whole order is ready, we will send the packing list to customer to arrange the shipment.
Quality Control
INO’s quality is 100% according to ISO9001 Standard.
We seriously take care of the quality control from IQC to OQC, throughout each step of the production.
Let us show you our quality control:
♦For raw materials
We’ll do the IQC in time. All materials are procured only from the verified suppliers, who have implemented and maintain certified quality management systems in their plants. With full certificates, such as RoHs, Reach, MSDS, FDA, LFGB, UL, EN549, BPA free, EN71, and so on;
♦For pre-production samples
we'll provide several pieces to our clients for assembly and function testing. We will seal the samples in time once they're approval.
♦For Bulk Production
We'll do the IPQCS & PQC (Multiple Sampling Inspection) during production and we'll do the FQC (Sampling Inspection) after deburr or breaking sharp edges. In order to timely find problems, solve problems, reduce defective products, reduce manufacturing costs.
After packing and assembling, we'll do the OQC (Sampling Inspection) to make sure the final goods are qualified.
INO Technology insist the principle "QUALITY FIRST".
Below you find find our inspection equipment for your reference.