WO2007083339A2 - Extruded plastic film, preferably of polyethylene, with longitudinal protective stripes - Google Patents

Extruded plastic film, preferably of polyethylene, with longitudinal protective stripes Download PDF

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Publication number
WO2007083339A2
WO2007083339A2 PCT/IT2007/000019 IT2007000019W WO2007083339A2 WO 2007083339 A2 WO2007083339 A2 WO 2007083339A2 IT 2007000019 W IT2007000019 W IT 2007000019W WO 2007083339 A2 WO2007083339 A2 WO 2007083339A2
Authority
WO
WIPO (PCT)
Prior art keywords
stripes
film
film according
extruded
polyethylene
Prior art date
Application number
PCT/IT2007/000019
Other languages
French (fr)
Other versions
WO2007083339A8 (en
WO2007083339A3 (en
Inventor
Vincenzo Scudieri
Original Assignee
Vincenzo Scudieri
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vincenzo Scudieri filed Critical Vincenzo Scudieri
Publication of WO2007083339A2 publication Critical patent/WO2007083339A2/en
Publication of WO2007083339A3 publication Critical patent/WO2007083339A3/en
Publication of WO2007083339A8 publication Critical patent/WO2007083339A8/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/14—Greenhouses
    • A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Definitions

  • Extruded plastic film preferably of polyethylene, with longitudinal stripes of different colour and/or thickness and/or material
  • Greenhouses used in agriculture consist of metallic or wooden constructions on which sheets of plastic material, generally polyethylene, are laid.
  • the contact points of the sheets with the constructions are the weakest points of the plastic covering as for resistance and life.
  • the overheating of the constructions because of the sunbeams causes the heat -to be transmitted to the sheets which are subjected to thermal deterioration. Additionally, the natural deterioration due to the ultraviolet rays of the sun "causes the useful life of the covering sheets to reduce drastically.
  • the present patent application for industrial invention seeks to provide an extruded plastic film ensuring a better protection to the points subject to wear.
  • the solution consists of providing an extruded film having central and lateral stripes of reinforcement and/or better protection against sunbeams along the contact areas with the constructions of the greenhouses, especially at the top and the sides thereof.
  • This object is achieved by a variety of ways different from one another and independent of the extrusion producing the plastic film, and namely:
  • the product of the invention can be made by the currently used installations for producing extruded plastic films with suitable modifications.
  • the conventional installations consist of hot extruders provided with nozzles through which the melted plastic material is extruded by bell blow, thus forming a material tube with a circumference up to 16 metres.
  • the tube comes out of the nozzle with a thickness ranging from 0.025 to 0.50 mm and is stretched in the longitudinal direction by a drawing assembly located in the upper portion of the construction serving as cooling tower and in the transversal direction until the desired diameter and thickness is reached.
  • a conventional extrusion installation of the described type can be used to provide the film with coloured stripes which are thickened or provided with additives just by adding two auxiliary extruders which inject the material to form the stripes covering the base film.
  • Fig. 1 of sheet 1/2 shows a schematic view of the installation disclosed above where the conventional extruders are indicated at 1 and the added extruders are indicated at 2.
  • Fig. 2 of sheet 2/2 shows an extruded film tube with added stripes 3 and 4.
  • Fig. 3 of sheet 2/2 shows a film provided with central and lateral stripes formed by cutting the tube along the generating line 5 of stripe 3.
  • a possible variation can propose that the added layer is located inside the extruded film or at both sides thereof.
  • the added layer can also be embodied in the hot melt of the film so that it is not superimposed to the film but merged therewith.
  • the disclosed installation is most intuitive and simple at the moment as it directly derives from known installations, however, different installations designed for the co-extruded plastic film provided with stripes according to the present invention can also be made without departing from the scope of the invention defined in the following claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Protection Of Plants (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to an extruded plastic film able to provide a covering sheet for greenhouses having longitudinal stripes (3, 4) of co-extruded material able to allow for the bearing points to withstand the test of time .

Description

Extruded plastic film, preferably of polyethylene, with longitudinal stripes of different colour and/or thickness and/or material
Greenhouses used in agriculture consist of metallic or wooden constructions on which sheets of plastic material, generally polyethylene, are laid. The contact points of the sheets with the constructions are the weakest points of the plastic covering as for resistance and life.
Actually, the overheating of the constructions because of the sunbeams causes the heat -to be transmitted to the sheets which are subjected to thermal deterioration. Additionally, the natural deterioration due to the ultraviolet rays of the sun "causes the useful life of the covering sheets to reduce drastically. The present patent application for industrial invention seeks to provide an extruded plastic film ensuring a better protection to the points subject to wear.
The solution consists of providing an extruded film having central and lateral stripes of reinforcement and/or better protection against sunbeams along the contact areas with the constructions of the greenhouses, especially at the top and the sides thereof. This object is achieved by a variety of ways different from one another and independent of the extrusion producing the plastic film, and namely:
• by a reflecting coloration of the lateral and central stripes (e.g., white, silver, etc.). Such coloration reflects the sunlight and helps to reduce the temperature of the sheet bearing construction;
• by an anti-UV additive added to the stripes.
• by a thickening of such stripes with respect to the thickness of the resting portions of the plastic film.
Such different ways can be used individually or in combination with one another.
The product of the invention can be made by the currently used installations for producing extruded plastic films with suitable modifications.
The conventional installations consist of hot extruders provided with nozzles through which the melted plastic material is extruded by bell blow, thus forming a material tube with a circumference up to 16 metres.
The tube comes out of the nozzle with a thickness ranging from 0.025 to 0.50 mm and is stretched in the longitudinal direction by a drawing assembly located in the upper portion of the construction serving as cooling tower and in the transversal direction until the desired diameter and thickness is reached. A conventional extrusion installation of the described type can be used to provide the film with coloured stripes which are thickened or provided with additives just by adding two auxiliary extruders which inject the material to form the stripes covering the base film.
The extruders apply the layer of material to form the stripes to the outside layer of the hot melt from the nozzle so that the drawing-in of such layer takes place just before the base materials is extruded from the nozzle. Fig. 1 of sheet 1/2 shows a schematic view of the installation disclosed above where the conventional extruders are indicated at 1 and the added extruders are indicated at 2.
Fig. 2 of sheet 2/2 shows an extruded film tube with added stripes 3 and 4.
Fig. 3 of sheet 2/2 shows a film provided with central and lateral stripes formed by cutting the tube along the generating line 5 of stripe 3.
A possible variation can propose that the added layer is located inside the extruded film or at both sides thereof.
The added layer can also be embodied in the hot melt of the film so that it is not superimposed to the film but merged therewith. The disclosed installation is most intuitive and simple at the moment as it directly derives from known installations, however, different installations designed for the co-extruded plastic film provided with stripes according to the present invention can also be made without departing from the scope of the invention defined in the following claims.

Claims

Claims
1. An extruded plastic film forming a covering sheet for greenhouses and other uses having stripes of co- extruded material overlying and/or underlying the base film in suitable positions to provide the contact points of the sheet and the bearing construction with a better protection
2. The film according to the preceding claim, characterized in that the co-extruded material stripe is embodied in the film.
3. The film according to the preceding claims, characterized in that the stripes extend longitudinally with respect to the sheet.
4. The film according to the preceding claims, characterized in that the stripes have a reflecting coloration with respect to the film to which they are applied.
5. The film according to the preceding claims, characterized in that the stripes have an anti-UV additive greater than the plastic base film.
6. The film according to the preceding claims, characterized in that the stripes have a thickening with respect to the resting portions of the plastic film.
7. The film according tto the preceding claims, characterized in that the stripes can have one or more combined features of claims 3, 4 and 5.
8. The film according to the preceding claims, characterized in that polyethylene is used as raw material.
9. The film according to the preceding claims, characterized in that all of plastic materials compatible with low-density polyethylene can be used as raw material.
10. The film according to the preceding claims, characterized in that all of plastic materials compatible with the film to which they are applied can be used as raw material for the stripes.
PCT/IT2007/000019 2006-01-19 2007-01-10 Extruded plastic film, preferably of polyethylene, with longitudinal protective stripes WO2007083339A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000005A ITNA20060005A1 (en) 2006-01-19 2006-01-19 EXTRUDED FILM IN PLASTIC MATERIAL, PREFERABLY POLYETHYLENE, EQUIPPED WITH LONGITUDINAL BANDS OF COLOR AND / OR THICKNESS AND / OR MATERIAL DIFFERENT FROM THE BASIC ONE.
ITNA2006A000005 2006-01-19

Publications (3)

Publication Number Publication Date
WO2007083339A2 true WO2007083339A2 (en) 2007-07-26
WO2007083339A3 WO2007083339A3 (en) 2007-09-13
WO2007083339A8 WO2007083339A8 (en) 2008-02-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2007/000019 WO2007083339A2 (en) 2006-01-19 2007-01-10 Extruded plastic film, preferably of polyethylene, with longitudinal protective stripes

Country Status (2)

Country Link
IT (1) ITNA20060005A1 (en)
WO (1) WO2007083339A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2531749A (en) * 2014-10-29 2016-05-04 Charles Paton Alexander Photoselective fabric for horticulture
IT201800011184A1 (en) * 2018-12-17 2020-06-17 Maria Rita Moccia COMBINED PLANT FOR BUBBLE FILM PRODUCTION WITH CONTEMPORARY CO-EXTRUSION OF LONGITUDINAL REINFORCEMENT COATINGS AND RELATED INDUSTRIAL MANUFACTURING PROCESS

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1384293A (en) * 1964-01-30 1965-01-04 Process for decorating plastic sheet material, device for carrying out the preceding process or similar process and product obtained by this process and device or similar product
AU6040673A (en) * 1972-09-14 1975-03-20 Auclair A cover fora greenhouse ora shelter
US4464157A (en) * 1981-10-05 1984-08-07 Mobil Oil Corporation Method of preparing a thermoplastic bag having reinforced handles
US4592938A (en) * 1985-03-25 1986-06-03 Mobil Oil Corporation Method of producing an internally reinforced thermoplastic film and film and articles produced therefrom
US4950511A (en) * 1982-09-27 1990-08-21 Tredegar Industries, Inc. Plastic film construction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1384293A (en) * 1964-01-30 1965-01-04 Process for decorating plastic sheet material, device for carrying out the preceding process or similar process and product obtained by this process and device or similar product
AU6040673A (en) * 1972-09-14 1975-03-20 Auclair A cover fora greenhouse ora shelter
US4464157A (en) * 1981-10-05 1984-08-07 Mobil Oil Corporation Method of preparing a thermoplastic bag having reinforced handles
US4950511A (en) * 1982-09-27 1990-08-21 Tredegar Industries, Inc. Plastic film construction
US4592938A (en) * 1985-03-25 1986-06-03 Mobil Oil Corporation Method of producing an internally reinforced thermoplastic film and film and articles produced therefrom

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2531749A (en) * 2014-10-29 2016-05-04 Charles Paton Alexander Photoselective fabric for horticulture
IT201800011184A1 (en) * 2018-12-17 2020-06-17 Maria Rita Moccia COMBINED PLANT FOR BUBBLE FILM PRODUCTION WITH CONTEMPORARY CO-EXTRUSION OF LONGITUDINAL REINFORCEMENT COATINGS AND RELATED INDUSTRIAL MANUFACTURING PROCESS
WO2020128846A1 (en) * 2018-12-17 2020-06-25 Moccia Maria Rita Combined system for manufacturing blown film with simultaneous coextrusion of longitudinal reig method thereof

Also Published As

Publication number Publication date
ITNA20060005A1 (en) 2007-07-20
WO2007083339A8 (en) 2008-02-14
WO2007083339A3 (en) 2007-09-13

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