Modern technologies and equipment for blowing extrusion of the films. Part I. Blowing extrusion of the films from plastics

Abstract

Wspó³czesne technologie i urz¹dzenia do wyt³aczania folii metod¹ wyt³aczania z rozdmuchiwaniem Cz. I. WYT£ACZANIE Z ROZDMUCHIWANIEM FOLII Z TWORZYW POLIMEROWYCH MODERN TECHNOLOGIES AND EQUIPMENT FOR BLOWING EXTRU-SION OF THE FILMS. PART I. BLOWING EXTRUSION OF THE FILMS FROM PLASTICS Summary-General characteristics and properties of the plastics used for manufacturing of the films as well as characteristics of the films produced (Table 1) were presented in this review. Basic good points of treelayer PE films in comparison with monolayer film properties were pointed out. Processes of mono-and multilayer films extrusion by either one-stage blowing process (Fig. 1) or two-stage one (Fig. 2) were discussed. The problems concerning film orientation in the extrusion process were additionally presented. Process of orientation leads indeed to the films showing advantageous useful properties but versatility of the equipment use is limited.

Hydrophobic molecular treatments of cellulose-based or other polysaccharide barrier layers for sustainable food packaging: A Review

“…Before considering the effects of various specific hydrophobic treatments of surfaces, there are some general points related to layered structures that have general applicability. First, multilayered films already can be regarded as a well-established strategy in food packaging (Stasiek 2005;Lim et al 2008;Lamnawar and Maazouz 2009;Garofalo et al 2018;Mizielinska et al 2020). Second, sometimes the addition of material to a barrier film is able to plug defects, such as holes (Martinpolo et al 1992).…”

Antistatic polyethylene free-standing films modified with expanded graphite - technological aspects

“…Antistatization is intended to change the resistive pa rameters of materials, often changing the plastic category from an insulator to a diffusing material [4]. Such a result can be obtained by applying an antistatic substance to the surface of the material or by modifying the polymer ma trix which will possess immanent antistatic features [5]. Although methods of material antistatization have been known for a long time, it is necessary to adapt them to a specific material, and also take into account many as pects of use such as product transparency and colour, ap proval for contact with food, mechanical strength, weld ability, etc.…”

Modern technologies and equipment for blowing extrusion of the films. Part II. Trends in development of processing lines for one-stage blowing extrusion of the films

“…i w³aoeciwooeci tworzyw polimerowych stosowanych w procesach wytwarzania folii, a tak¿e zagadnienia orientowania folii w procesie wyt³aczania przedstawiono w czêoeci pierwszej publikacji [6]. W niniejszej drugiej czêoeci omówiono tendencje rozwojowe w budowie linii technologicznych wyt³aczania z rozdmuchiwaniem folii, z uwzglêdnieniem automatyzacji procesu wyt³aczania.…”

“…Konstrukcja linii do wyt³aczania folii wielowarstwowych metod¹ rozdmuchiwania (rys. 1, powtórzony z [6]) ró¿ni siê od budowy linii wyt³aczania folii jednowarstwowych tylko ilooeci¹ wyt³aczarek oraz konstruk-cj¹ g³owicy. Do ka¿dego rodzaju tworzywa lub koloru s¹ stosowane oddzielne wyt³aczarki wyposa¿one w osobne przewody uplastycznionego tworzywa, które transpor-tuj¹ tworzywo do tej samej g³owicy.…”

“…Europejscy producenci wyt³aczarek oferuj¹ g³ównie uk³ady uplastyczniaj¹ce z rowkowan¹ stref¹ zasilania, która ma regulacje temperatury, natomiast na rynku amerykañskim [18] w wiêkszooeci przypadków s¹ to wy-t³aczarki bez rowków. 6 -kosz stabilizuj¹cy (kalibruj¹cy), 7 -mechanizm oerubowy z napêdem do podnoszenia kosza, 8 -urz¹dzenie odbieraj¹ce obrotowo-nawrotne, 9 -konstrukcja nooena, 10 -aktywator z wyci¹giem ozonu, 11 -uk³ad prowadzenia sp³aszczonej folii rurowej (rêkawa), 12 -urz¹dzenie nawijaj¹ce, 13 -zespó³ odbioru obciêtej krawêdzi folii, 14szafa sterownicza Fig. 1.…”