plastik transparan, karena transmitansinya yang tinggi, pasti membutuhkan kualitas permukaan yang ketat dari produk plastik, dan tidak dapat memiliki cacat seperti tanda, pori-pori, pemutih, halo kabut, bercak hitam, perubahan warna, kilap yang buruk, dll. Karena itu, di seluruh proses pencetakan injeksi, the design of raw materials, peralatan, cetakan, and even products should be paid great attention to and put forward strict. To special requirements. Kedua, transparent plastics are mostly of high melting point and poor fluidity, so in order to ensure the surface quality of products, it is often necessary to have higher temperature, tekanan injeksi, injection speed and other technological parameters should be fine-tuned, so that the injection molding can be full of mold, and will not produce internal stress and cause product deformation and cracking.
Karena itu, from the raw material preparation, the equipment and mold requirements, injection molding process and product raw material processing must be strictly operated.
1. The preparation and drying of raw materials may affect the transparency of the products because of any impurities in the plastics. Karena itu, we must pay attention to sealing in the process of storage, transportation and feeding to ensure that the raw materials are clean. perlu untuk membersihkan laras lensa secara menyeluruh, water is contained in raw materials, which causes deterioration of raw materials after heating, jadi harus dikeringkan. For injection, the dry hopper must be used. It is also important to note that in the drying process, the input air should be filtered and dehumidified to ensure that the raw materials will not be polluted. The drying process is as follows: drying process of transparent plastics:
2.Cleaning of cylinder, screw and accessories
In order to prevent pollution of raw materials and the existence of used materials or impurities in the hollows of screw and accessories, especially the existence of resin with poor thermal stability, so before use and after shutdown, screw cleaners are used to clean the parts so that no impurities can be adhered to them. Ketika tidak ada pembersih sekrup, the screw can be cleaned with PE, PS and other resins. When the temporary shutdown, in order to prevent the raw material staying at high temperature for a long time, causing a drop in dryer and barrel temperature should be reduced, seperti PC, PMMA barrel temperature should be reduced to below 160 derajat Celsius (hopper temperature for PC should be reduced to below 100 derajat Celsius).
3. Dalam desain cetakan:, attention should be paid (termasuk desain produk) In order to prevent backflow obstruction, or uneven cooling resulting in poor plastic molding, surface defects and deformation, in general mold design, should pay attention to the following points:
1) the thickness of the wall should be as uniform as possible and the release angle should be large enough.
2) The transition part should be smooth, and gradually transition, to prevent sharp corners, sharp edges, especially PC products must not have a gap;
3) The gate and runner should be as wide and thick as possible, dan posisi gerbang harus diatur sesuai dengan proses penyusutan dan kondensasi, and the material well should be cooled if necessary.
4) the surface of the mold should be smooth and low in roughness (well below 0.8).
5)vent hole. Tangki harus cukup untuk mengeluarkan udara dan gas dalam lelehan pada waktunya.
6)
6) except for PET, ketebalan dinding tidak boleh terlalu tipis, umumnya tidak kurang dari LMM.
4. The problems that should be paid attention to in injection molding process (termasuk persyaratan mesin cetak injeksi) Untuk mengurangi stres internal dan cacat kualitas permukaan, the following problems should be paid attention to in injection molding process:
1) special screw and injection molding machine with single temperature control nozzle should be selected.
2) the injection temperature should be relatively high when the plastic resin is not decomposed.
3) Tekanan injeksi: generally higher to overcome the defect of high melt viscosity, but too high pressure will produce internal stress and cause difficult demoulding and deformation;
4) cetakan injeksi plastik presisi tinggi: under the condition of satisfying filling mold, umumnya rendah, good can use slow one fast one slow multi-stage injection;
5)Waktu penahanan tekanan dan siklus pencetakan: in order to meet the
requirements of product filling, no hollows, bubbles, harus sesingkat mungkin, in order to minimize the residence time of melt in the barrel;
6) Kecepatan sekrup dan tekanan balik: under the premise of meeting the plasticizing quality, should be as low as possible to prevent the possibility of release;
7) Suhu cetakan: kualitas pendinginan produk memiliki dampak besar pada kualitas, jadi suhu cetakan harus bisa mengontrol prosesnya secara akurat, jika memungkinkan, suhu cetakan harus lebih tinggi.
5. In order to prevent the deterioration of the upper surface quality, the mold release agent should be used as little as possible in general injection molding, and not more than 20% when the recycled material is used.
In addition to PET, the products should be post-processed to eliminate internal stress, PMMA should be 70-80t hot air cycle drying for 4 jam; PC harus berada di udara bersih, Gliserin, liquid paraffin and other heating 110-135 derajat Celsius, waktu sesuai dengan produk, high need more than 10 jam. PET must be subjected to biaxial stretching to obtain good mechanical properties.
JasonMould Industrial Company Limited, didirikan pada 2010, adalah produsen cetakan injeksi terkemuka di Cina. JasonMould mengkhususkan diri dalam produksi cetakan plastik untuk peralatan rumah tangga, peralatan medis, peralatan elektronik, peralatan keselamatan serta sistem pemantauan.
Perusahaan telah berakhir 15000 pabrik meter persegi. Dengan divisi perkakas injeksi plastik yang memiliki mesin dan keahlian yang berbeda, JasonMould menawarkan alat dari suku cadang ponsel kecil dan presisi hingga sebesar suku cadang otomotif. Alat kami terutama diekspor ke AMERIKA SERIKAT., Eropa, Jepang dan Inggris. Strategi diversifikasi dan layanan penuh JasonMould telah memenangkan pujian dari pelanggan di seluruh dunia.
Misi kami adalah untuk menyediakan produk dan layanan cetakan berkualitas tinggi kepada pelanggan kami. Kami bertujuan untuk melampaui ekspektasi harga pelanggan kami, kualitas dan pengiriman tepat waktu. Untuk mencapai misi kami, JasonMould:
Commits to continually improve employee skills and efficiency,
Provides our employees a clean and safe working environment,
Upgrades machine technology and support equipment through a strict maintenance program, dan
Maintains customers’ tooling to its highest peak of performance
Untuk lebih lanjut tentang produsen kustom produk cetakan plastik,silahkan kunjungi https://www.jasonmolding.com/
Pertanyaan Hubungi:
Kontak person: James Yuan
Nama Perusahaan: JasonMould Industrial Company Limited
Alamat: Desa LongGang,Kota LongXi,Kabupaten BoLuo,Kota HuiZhou,Provinsi Guangdong, Cina
Telepon: 86-752-6682869
Surel: [email protected]
Situs web: https://www.jasonmolding.com
