Two-Cavity Unscrewing Mold for a Glass Fiber Reinforced Polyamide Threaded Plug

Two-Cavity Unscrewing Mold for a Glass-Fiber-Reinforced Polyamide Threaded Plug The threaded plug consists of a top flange with a hexagonal recess in its upper surface. The underside of the flange has a pot-shaped section that encloses the hexagonal recess and to the bottom of which a stop pin is attached. This section is enclosed by an outer ring that carries the threads. In addition, the underside exhibits an annular groove ‘‘O’’ around the outer ring and intended to hold a seal. The annular space between the pot-shaped section and outer ring contains radial ribs. Mold Release of the annular groove and threads is accomplished most easily by unscrewing the molded part from a threaded sleeve. The mold is designed with two cavities. Release of the threads is accomplished on the stationary mold half. The threaded sleeves are located in guide bushings and are driven by the gear and spindle of the unscrewing mechanism. The annular core forms the stop pin and, by means of a tubular extension, the annular space in the plug. A central core pin provides for venting of the stop pin cavity. The hexagonal recess is formed by the core insert , which also encloses an ejector pin . The other ejector pins are used to knock out the sprue and runner. Gating The location of the ejectors and unscrewing mechanism requires that injection takes place into the mold parting line . Each plug has a single submarine gate located at the flange. Mold Temperature Control The mold plates on either side of the parting line have cooling lines encircling the mold inserts. The annular core contains a double-threaded cooling pin. Part Release=Ejection The latch causes the mold to first open at parting line ‘I’. This withdraws the annular core from the underside of the plug and releases the stop pin. This motion is limited by the stop bolt . The opening motion is now interrupted and the unscrewing begins. The threaded sleeve is unscrewed while the hexagonal core insert prevents the molded part from turning. Upon completion of unscrewing, the main parting line ‘II’ opens, shearing off the submarine gates. The molded part is still retained on the core insert; the sprue and runner are held by the undercut in the sprue puller. As the ejector plate moves forward, the ejector pins eject the molded part and the sprue.

DESIGN PRODUK KEMASAN BOTOL PLASTIK

KEMASAN PLASTIK

Sarana yg dibutuhkan untuk pembuatan kemasan plastik adalah

1.Cetakan ( Mold )

2.Mesin 

3.Material

4.Operator

Keberhasilan suatu kemasan plastik ditentukan oleh 

1.Fungsi kemasan 

2.Estetika 

3.Biaya 

Dari ke 3 factor penentu keberhasilan kemasan plastik semua ditentukan oleh DESIGN nya , artinya Design kemasan menjadi factor yg sangat penting

Konsep mendesign kemasan plastik

1.Sesuai dng fungsi yg akan dipakai

2.Mampu diproduksi dng baik

3.Membutuhkan biaya yg paling ekonomis

Hubungan design kemasan plastik dan cetakan ( mold )

Bentuk dan kekuatan design kemasan ,sangat dipengaruhi oleh cetakan , artinya adalah jika design secara bentuk dan konstruksi sangat baik tetapi secara tehnis tidak dapat dicetak berarti design kemasan tersebut harus dikoreksi.

Konsep design kemasan terhadap mold

1.Harus bisa dibuat cetakannya

2.Harus bisa diproses 

3.Harus dng biaya yg ekonomis ( sesuai )

Tehnik mendesign kemasan plastik

1.Kenali fungsi kemasan

2.Kenali material plastik yg akan dipakai

3.Kenali tehnik dasar design cetakan

4.Kenali sifat isi produk ( yg akan bersentuhan langsung dng kemasan )

5.Kenali mesin yg akan dipakai memproduksi

6.Kenali mesin / alat / proses selanjutnya yg akan dipakai sampai menjadi barang jadi

7.Kenali karakter manusia secara umum

8.Kenali bagaimana kemasan itu disimpan

9.Kenali bagaimana kemasan akan dikirim

Kemasan plastik untuk proses blow molding mesin

1.Untuk proses inside parison ratio perbandingan mulut botol dan bagian terbesar maksimal 2.5 x

2.Untuk outside parison ratio perbandingan  tergantung dari sarana mesin yang tersedia dan batasan estetika yang diijinkan pelanggan

3.Hindari bentuk 2x tajam pada sudut karena akan membuat dinding tipis yg akan berakibat botol bolong / pecah

4.Hindari kedalaman botom ( push up ) yg berlebihan karena akan membuat sudut bottom tipis dan biasanya akan menggores pada pundak atau mulut botol., sehingga harus disesuaikan sampai mendapatkan bentuk yg optimal.

 

LAMINATION and UV VARNISH

Coating is a coating process that is applied to an object, the aim is to improve the surface properties of the coated object. These surface properties are expected to protect the prints against fingerprints, scratches, stains or the impact of humidity and air temperature. In the world of printing there is coated paper. If the coating results are applied to coated paper, the results will be more optimal because the surface is not hard and also easily absorbs water. In addition, the print will have a glossy or glossy, satin (not glossy), and doff (dim) effect after being coated. Lamination jobs are post-print jobs, such as discussed in the previous chapter, laminates are classified into 2 (two) various forms of how to do it, namely (1) the form of closing objects work to form a corner/envelop (pouch) and (2) roll form. While the working method with a heat system (thermal) and cold system (cold). There are 2 (two) types of laminating, namely gloss and dob. Gloss exudes a glossy effect dob ​​displays dim/shady effect. The purpose of lamination is so that the printed object has artistic impression, that impression can be shiny or dob, other than that it can also protect and make printed objects durable. Judging from the results of the work, There are 2 (two) types of lamination, namely: lamination that results in rigid and laminate which is flexible. Laminate is often found in the photocopy business oplag is low, used to laminate things valuable, for example a certificate, certificates, and so on. As for the many flexible laminates used for mass work or large oplag, e.g. etiquette, dos of bread, leaflets, posters, invitations, etc

Computer to Plate versus Computer to Film

Computer to Plate (CTP) is an imaging technology used in modern printing processes. In this technology, images are created in a Desktop Publishing (DTP) application and output directly to a printing plate. Unlike the previous technology where computer files are output to the form of film, and this film is then used to make printing plates. CTP has advantages over conventional platemaking. With CTP, the need for films and related developed chemicals is eliminated. CTP improves the sharpness and detail of the image on the plate. CTP avoids the potential loss in quality that may occur during the unselect of film, including scratches in the film, and variations in exposure. Plates are produced in less time, are more consistent and at a lower cost. CTP can also increase registers in the print process. The CTP system can significantly increase the plate production output. The platesetter for newspaper production can output up to 300 plates per hour at 1270 dpi (dots per inch), while for commercial applications the CTP system can produce 60 plates at 2400 dpi. 

Computer to plate (CTP) is an imaging technology used in modern printing machine processes. In this technology, an image created in a Desktop Publishing (DTP) application is output directly to a printing plate. This compares with the older technology, Computer to film (CTF), where the computer file is output onto a photographic film. This film is then used to make a printing plate, in a similar manner to a contact proof in darkroom photography. 

Advantages of CTP CTP has several advantages over conventional platemaking. In CTP, one generation (transfer of film image to the printing plate) is removed from the printing process, increasing sharpness and detail. Plates are produced in less time, are more consistent, and at a lower cost. CTP can also improve registration and image-to-edge repeatability over traditional methods. CTP, the media is registered (held in precise position) in the platesetter during imaging, and does not rely on a separately-aligned pin grid, as is the case with film. Defects due to dust, scratches or other artifacts are minimized. CTP systems can significantly increase print shop productivity. The fastest platesetters can output more than 120 12-inch plates per hour, punched and ready to hang on the press. CTP decreases dot gain slightly by eliminating the increase in halftone dot size which can occur in the film-to-plate exposure process when negative film is used (Mainly US) CTP increases dot gain slightly by eliminating the decrease in halftone dot size which can occur in the film-to-plate exposure process when positive film is used (Mainly Europe) Small portrait presses that typically create 1 or 2 color output can use anything from a standard laser printer, for low quality/low volume, up to a higher-end dedicated platesetter for higher quality and volume. 

Computer to Film Computer to Film (CTF) is a print workflow involving the printing from a computer, straight to film. This film is then burned onto a lithographic plate, using a plate burner. The plate is then put on an offset printing press to make a product (usually thousands of copies). This process requires a clean environment, skilled workers, and a well thought out proofing system / workflow to maximize quality. CTF is being replaced with the more advanced CTP (Computer to Plate) technology.