Tidak peduli apa produk cetakan injeksi, itu tidak dapat dipisahkan dari cetakan injeksi, tapi terkadang fenomena penyusutan cetakan injeksi, jadi apa alasan penyusutan cetakan injeksi?.
1. Ekspansi termal dan penyusutan dingin plastik
Dalam proses pencetakan cetakan plastik, perlu mencairkan bahan baku plastik. Pada saat ini, suhu leleh tercapai 200 ~ 300 derajat, dan bahan baku plastik dipanaskan hingga mengembang. Namun, in the cooling process of the injection mold, the temperature decreases, and its volume potential must shrink.
2. Changes in the chemical structure of plastics
Sebagai contoh, in the molding process of thermosetting plastics, the resin molecules change from linear structure to body structure, and the volume mass of the shape structure is larger than that of the linear structure, and its total volume becomes smaller, so the shrinkage phenomenon occurs.
3. Residual stress change
Dalam proses pencetakan injeksi, due to the shear force of molding pressure, anisotropi, mixing heterogeneity of additives and mold temperature
Setelah dicetak, there is residual stress in the injection mold, which will gradually decrease and redistribute. Hasil dari, the plastic mold shrinks again, which is generally called post shrinkage.
4. Gate section size
Different injection molds have different cross-section sizes. Large gate helps to increase the cavity pressure and prolong the gate closing time, so that more melt can flow into the cavity
5. Plastic varieties
Secara umum, crystalline plastics, such as PP and PA, exhibit larger shrinkage and wider shrinkage range than crystalline plastics such as PC, PS and ABS.
The reasons for the large shrinkage of crystalline plastics are the influence of thermal expansion coefficient of plastics and the condensation of melt during the formation of crystalline structure.
The above five points are the causes of injection mold shrinkage, so for injection molding factory, when producing injection molding products, we must often check the quality of injection mold.
Tentang JasonMould Industrial Company Limited
Jasonmould adalah pembuat cetakan Cina dari cetakan plastik- cetakan injeksi, cetakan die casting, cetakan tiup plastik, cetakan rotasi, medis cetakan injeksi plastik, dua tembakan cetakan injeksi plastik, masukkan cetakan, overmolding, cetakan injeksi logam, cetakan injeksi mikro, cetakan injeksi bubuk, cetakan injeksi keramik, cetakan injeksi cair, cetakan injeksi husky, cetakan rumah tangga, pengecoran cetakan, alat cetakan mati, cetakan khusus, cetakan cina, perkakas prototipe cepat rapid, perkakas prototipe plastik plastic, perkakas tekan pukulan, mati dan perkakas untuk bagian ponsel / ponsel cell, bagian otomotif, penyedot debu, alat isi ulang, telepon, mesin fotokopi, komputer, speaker multimedia, dan banyak produk elektronik dan peralatan rumah tangga lainnya. Dan juga produsen produk plastik, produsen cetakan Cina- bagian-bagian yang terbuat dari plastik, tangki air plastik, bola plastik, wadah plastik, gesper plastik, jangkar plastik, gantungan plastik, sendok plastik, pemasangan pipa plastik, gelas plastik, peralatan makan plastik, gelas plastik, botol-botol plastik, nampan plastik, wadah kosmetik plastik, kotak plastik, wadah makanan plastik, kursi plastik, tutup plastik, penutupan tutup plastik, tabung plastik, pipa air plastik, kenop plastik, tabung plastik, kotak utilitas plastik, rak plastik dan sebagainya.
Kontak:
Orang: James Yuan
Perusahaan: JasonMould Industrial Company Limited
Menambahkan: Desa LongGang,Kota LongXi,Kabupaten BoLuo,Kota HuiZhou,Provinsi Guangdong, Cina
Telp: 86-752-6682869
Surel: [email protected]
Situs: https://www.jasonmolding.com/custom-injection-molding/
