Stroj za pakiranje termooblike

Kaj je stroj za termoformiranje embalaže?

Stroj za pakiranje s toplotno obdelavo je stroj, ki s toploto oblikuje plastiko v kalupu. Ta proizvodni postopek oblikuje blisters v določeno obliko in jo nato obreže. Obstajajo različne vrste strojev za termoformiranje embalaže, ki se lahko uporabljajo. Če na primer potrebujete le vzorce in prototipne dele, bo zadostoval majhen laboratorijski stroj, ki lahko segreje majhne izrezane dele plastične folije. Če potrebujete velikoserijske in kompleksne aplikacije ter želite izdelati več tisoč končnih delov na uro, boste morali uporabiti velike proizvodne stroje za segrevanje in oblikovanje plastične pločevine. Ti stroji za termoformiranje embalaže oblikovane dele tudi obrezujejo, vse to v neprekinjenem hitrem postopku.

Kako delujejo stroji za termoformiranje embalaže?

Kot smo že omenili, se stroj za pakiranje s termoplastiko ukvarja z oblikovanjem blisters v določeno obliko. Postopek je naslednji: plastenka se v pečici segreje na dovolj visoko temperaturo, da se lahko raztegne v ali na kalup, nato pa se ohladi. Pri termoformiranju z velikim strojem se plastična pločevina transportira skozi peč s pomočjo sklopa indeksnih verig, ki prebodejo pločevino, ki se neprekinjeno dovaja iz zvitka. Nato se segreta pločevina prepelje do oblikovalne postaje, kjer se namesti med kalup in tlačno škatlo. Ta se zapreta na pločevino. Hkrati vakuum in zrak pod pritiskom poskrbita, da se odstrani ves ujeti zrak, plastična pločevina pa se potegne v kalup ali na kalup, da se popolnoma prilega obliki. Nato se odvečni material obreže in shrani, da se lahko reciklira.

Različne vrste toplotnega oblikovanja

Vacuum Forming: A plastic sheet within a frame is heated until it becomes highly flexible. A vacuum extracts the air, forcing the sheet into a mould. This fast and cost-effective process is perfect for high-volume projects.

Pressure Forming: Following steps akin to vacuum forming, pressure forming incorporates an additional tool that presses the part into place while the vacuum removes air. This method yields more detailed pieces with consistent plastic thickness.

Drape Forming: In this technique, the heated plastic sheet is draped over or pressed onto a mandrel or form. Though less precise, it is an ideal option when cost is a primary concern, as it requires minimal tooling or fixtures. However, lower costs come at the expense of accuracy.

Billow Forming: Also known as "free forming," this method does not use a mould. Instead, air jets blow the heated plastic into a bubble, making it suitable for constructing domes or skylights.

Matched Mold Forming: This process employs both male and female moulds to shape a part precisely. While highly detailed, matched mould forming entails higher tooling costs due to the need for additional components.

Twin Sheet Forming: Two layers are heated and shaped simultaneously before being combined to form a single piece. This technique is optimal for creating double-walled and hollow items.

Prednosti stroja za pakiranje s termoplastiko

• Quick and easy process: the mould and pressure box ensure that the plastic sheet can quickly and easily be formed in the desired shape.
• Suitable for nearly all types of plastic: different types of plastic have different properties. Most thermoplastics are suitable for a thermoform packaging machine.
• Sturdy material: the plastic that is used in thermoforming is sturdy, making it ideal for different types of blister packaging.
• Versatile: the plastic sheets can be formed into or onto any shape mould, making the thermoforming packaging machine very versatile.