US3753825A - Process for the production of sheets of cellulose nitrate or cellulose acetate - Google Patents

Process for the production of sheets of cellulose nitrate or cellulose acetate Download PDF

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Publication number
US3753825A
US3753825A US00006402A US3753825DA US3753825A US 3753825 A US3753825 A US 3753825A US 00006402 A US00006402 A US 00006402A US 3753825D A US3753825D A US 3753825DA US 3753825 A US3753825 A US 3753825A
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United States
Prior art keywords
cellulose acetate
plate
sheet
transparent
blue
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00006402A
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English (en)
Inventor
H Stock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dynamit Nobel AG
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Dynamit Nobel AG
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 Dynamit Nobel AG filed Critical Dynamit Nobel AG
Application granted granted Critical
Publication of US3753825A publication Critical patent/US3753825A/en
Anticipated expiration legal-status Critical
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D12/00Producing frames
    • B29D12/02Spectacle frames
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/26Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/26Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/266Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension of base or substrate

Definitions

  • Sheets or strips of Celluloid or cellulose acetate are used for the manufacture of spectacle frames, combs, filter plates, scales (graduated elements), templates, or other articles.
  • These semifinished products are employed in one color, namely transparent or opaque or in covered colors, as well as twoor multicolored arrangements. They can be in the form of socalled inlays (embeddings), for example, Havana or agate, and as twoand multiple-layered laminations.
  • the sheets have been produced in accordance with the block method, wherein a solventcontaining plastic (synthetic polymeric material) mass is boiled into blocks under pressure at an elevated temperature. Inlays are obtained by inserting colored components in the strip or cube-shaped plastic, boiled mass, in accordance with specific empirical values, and compressing the composite at an elevated temperature. This procedure is repeated twice to three times, depending upon the pattern.
  • a solventcontaining plastic synthetic polymeric material
  • the individual sheets are glued to one another in a partially or completely desiccated condition, with the aid of solvents.
  • An object of the present invention is to avoid the prior art disadvantages in producing sheets of Celluloid or cellulose acetate.
  • Another object of the present invention is to provide a process for producing sheets of cellulose acetate and cellulose nitrate with differently colored zones which are sharply defined, true in size, reproducible, of flawless quality and inexpensive to produce.
  • the sheet surface is treated with an application of color (ink), by means of a printing process, for example a screen-printing process
  • a printing process for example a screen-printing process
  • the coloring material contains as a binder, the same cellulose nitrate or acetate of which the sheet has been produced.
  • the sheet is made with the use of solvents which exhibit good solubility properties with respect to the material to be printed.
  • inks and of the present invention By means of inks and of the present invention, well drying and laminatable prints can be obtained, whereas the silk-screen printing inks, which are available commercially and which are produced with polyvinyl compounds, cannot be utilized due to plasticizer migration (seeping). Thus, the printed'on ink becomes smeary and during the subsequent laminating procedure there is no or very little adhesion in the printing zone.
  • the printing inks of the present invention can contain a variety of pigments, either individually or in combination.
  • Exemplary of the printing inks which can be used in the present invention included a composition containing about 10 cellulose acetate, about 40% acetone,
  • a protective plate of desired thickness is generally laminated to the sheet in the press.
  • the otherwise customary laminating method that is, operating with solvents, cannot be utilized, since the print will become partially dissolved and smear.
  • a so-called adhesive film having a high plasticizer content as it is used in some cases for the lamination of cellulose acetate plates, a sharply contored print is retained, which print is protected by the eminently adhering protecting film laminated thereon.
  • the plates thus withstand the customary processing stresses, such as stamping (punching), bending, and milling.
  • Exemplary of the adhesive films which can be used in the present invention include a composition comprising about 50-60% cellulose acetate and about 40-50% of plasticizer mixture of phthalic acid ester and phosphoric acid ester.
  • triangular or rectangular zones 1 are printed on a 5 mm thick blue-transparent plate of optical cellulose acetate, in a conventional manner by means of the silk-screen printing process.
  • a screen-printing ink colored with blue pigments and containing cellulose acetate is employed.
  • an adhesive film having a thickness of about 0.1 mm, as well as a blue-transparent cellulose acetate plate having a thickness of about 0.9 mm. are placed thereon.
  • the bonding by lamination is conducted at temperature of about 140 170C., preferably about 160C, and under a pressure of 30 atmosphere gauge in a multilayer plate press. From the plate, the spectacle frames 2 or also other configurations can then be stamped out.
  • a wet mix i.e. containing volatile solvent
  • a wet mix is prepared by mixing cellulose acetate flake, plasticisers, and solvents in a kneader of the Werner-Pfleiderer type. Colourants may be added at this stage.
  • a typical formulation for a clear sheet is as follows:
  • the extremely viscous mixture is filtered by being forced under high pressure through filtering screens.
  • This operation is performed by a stuffing press, which consists basically of a cylinder to contain the viscous mass and a hydraulically-actuated ram to apply pressure,
  • the composition passes to a pair of warm mixing-rolls, on which rolling is carried out until the solvent content is reduced to about 10 percent.
  • the solvent vapour removed during this operation is ducted away for recovery.
  • the mass When the mass has reached this stage, it is cut off the rolls as a hide about 1 in. thick. This hide is laid on a thick steel base-plate which is usually grooved or otherwise indented to enable the plastic to make a good key" on to the plate during the pressing operation.
  • a block 56 in. thick and about 52 in. long by 22 in. wide is inserted into a hydraulic press, a polished steel plate, placed upon the top of the block, and a pressure of about 1 ton/in. applied, while maintaining the platens at a temperature of about 95C. Heating under pressure is continued for several hours, and the press is then cooled, still holding the pressure. Complete cooling of the block is very important, and may require 6 h or more in the press.
  • the block is next transferred to an automatic slicingmachine, being held on the bed of the machine by means of the base-plate which has become firmly welded to the block during the pressing operation.
  • the height of the knife of the slicing machine is set at the start of the slicing operation and descends automatically for a predetermined distance after each cut, thus producing sheets of substantially the same thickness.
  • the sheets produced in this manner still contain an appreciable amount of volatile solvent, which is removed by storing them in warm seasoning-rooms.
  • the final operation is that of polishing to remove the knife marks.
  • the sheets are placed between highly polished nickel plates, and pressed in a hydraulic press at about C. under a pressure of 1 ton/inf. After applying pressure for a few minutes, the press is cooled, still under pressure.
  • Multi-daylight presses are normally used, enabling a number of sheets to be treated at the same time. If desired, matt or embossed surfaces can be produced by this operation. When cold, the sheets are removed from the press and passed to storage.
  • Variegated colour effects can be produced by forming a block with alternate hides of different colours. After slicing, the sheets are trimmed to size, restacked on end in the desired arrangement, and rewelded into a new block, from which multicolour sheets may subsequently be sliced.
  • a process for the production of plates of cellulose acetate having sharply defined differently colored zones which comprises producing a thick bluetransparent plate of optical cellulose acetate; treating desired zones of said plate with a printing ink colored with blue pigments containing cellulose acetate as a binder therefor, a solvent for cellulose acetate, and a small amount of a plasticizer for cellulose acetate; drying the treated plate; placing a thin adhesive film consisting essentially of 50 to 60 percent by weight of cellulose acetate and 40 to 50 percent by weight of a plasticizer for said cellulose acetate thereon; applying a blue-transparent cellulose acetate plate having a thickness substantially less than that of the printing plate to said adhesive film to thereby form a composite plate product; and bonding said composite product at a temperature of about 140 to 170C. and at a pressure of product is bonded at a temperature of about 160C.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
US00006402A 1969-02-04 1970-01-28 Process for the production of sheets of cellulose nitrate or cellulose acetate Expired - Lifetime US3753825A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691905293 DE1905293A1 (de) 1969-02-04 1969-02-04 Verfahren zur Herstellung von Platten aus Celluloid oder Celluloseacetat

Publications (1)

Publication Number Publication Date
US3753825A true US3753825A (en) 1973-08-21

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ID=5724195

Family Applications (1)

Application Number Title Priority Date Filing Date
US00006402A Expired - Lifetime US3753825A (en) 1969-02-04 1970-01-28 Process for the production of sheets of cellulose nitrate or cellulose acetate

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US (1) US3753825A (de)
DE (1) DE1905293A1 (de)
FR (1) FR2032711A5 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5895693A (en) * 1996-04-11 1999-04-20 Linda Sundlin Decorative products made from film strips and a method of making such products
US20070254140A1 (en) * 2006-04-30 2007-11-01 Okia Optical Co., Ltd. Laminate for eyeglass frame with embedded design pattern and manufacturing method thereof
US20090174860A1 (en) * 2006-09-07 2009-07-09 Okia Optical Company, Ltd. Eyeglass frame with embedded design pattern and manufacturing method thereof
CN104441713A (zh) * 2013-09-25 2015-03-25 玛珠舍利1849股份公司 具有混色的基于纤维素乙酸酯的产品的制造方法以及用该方法获得的例如眼镜等产品
EP2758829B1 (de) 2011-09-21 2016-03-23 OKIA Optical Co. Ltd. Verfahren zur herstellung von brillengestellen durch spritzgiessen
US9594256B2 (en) 2012-08-24 2017-03-14 Okia Optical Co., Ltd. Thermoplastic laminate, decorative part for eyewear and process of preparation thereof
WO2024012892A1 (en) * 2022-07-15 2024-01-18 Luxottica S.R.L. Frame for eyeglasses and method for providing the frame

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3835722A1 (de) * 1988-10-20 1990-04-26 Niggel & Schuler Verfahren und vorrichtung zur fertigung von kunststoffbuegelenden und kunststoffbuegelende fuer metallbrillen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB479508A (en) * 1935-05-02 1938-02-07 Celluloid Corp Improvements in or relating to artificial thermoplastic materials
GB851489A (en) * 1957-07-23 1960-10-19 Marley Tile Co Ltd Improvements relating to deco rative laminated sheet materials
US3255695A (en) * 1963-10-16 1966-06-14 Markem Machine Co Method of printing and apparatus therefor
US3389029A (en) * 1964-06-23 1968-06-18 Black Box Collotype Studios In Method of making transparency
US3470054A (en) * 1965-03-15 1969-09-30 John J Tyrrell Method of process color printing with water-base inks
US3472802A (en) * 1966-11-23 1969-10-14 Inter Chem Corp Novel nitrocellulose flexographic printing inks

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB479508A (en) * 1935-05-02 1938-02-07 Celluloid Corp Improvements in or relating to artificial thermoplastic materials
GB851489A (en) * 1957-07-23 1960-10-19 Marley Tile Co Ltd Improvements relating to deco rative laminated sheet materials
US3255695A (en) * 1963-10-16 1966-06-14 Markem Machine Co Method of printing and apparatus therefor
US3389029A (en) * 1964-06-23 1968-06-18 Black Box Collotype Studios In Method of making transparency
US3470054A (en) * 1965-03-15 1969-09-30 John J Tyrrell Method of process color printing with water-base inks
US3472802A (en) * 1966-11-23 1969-10-14 Inter Chem Corp Novel nitrocellulose flexographic printing inks

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Yarsley et al., Cellulose Plastics , pp. 97, 98, 206 and 207, ILIFFE Books Ltd. (1964), London, copied in Sci. Lib.: TP 986 A2 436. *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5895693A (en) * 1996-04-11 1999-04-20 Linda Sundlin Decorative products made from film strips and a method of making such products
US20070254140A1 (en) * 2006-04-30 2007-11-01 Okia Optical Co., Ltd. Laminate for eyeglass frame with embedded design pattern and manufacturing method thereof
US20100314034A1 (en) * 2006-04-30 2010-12-16 Okia Optical Co., Ltd. Laminate for eyeglass frame with embedded design pattern and manufacturing method thereof
US20090174860A1 (en) * 2006-09-07 2009-07-09 Okia Optical Company, Ltd. Eyeglass frame with embedded design pattern and manufacturing method thereof
US8652385B2 (en) 2006-09-07 2014-02-18 Okia Optical Company Ltd. Method of manufacturing a decorative article with sealed decorative laminated sheet
EP2758829B1 (de) 2011-09-21 2016-03-23 OKIA Optical Co. Ltd. Verfahren zur herstellung von brillengestellen durch spritzgiessen
US9594256B2 (en) 2012-08-24 2017-03-14 Okia Optical Co., Ltd. Thermoplastic laminate, decorative part for eyewear and process of preparation thereof
US10401644B2 (en) 2012-08-24 2019-09-03 Okia Optical Co., Ltd. Thermoplastic laminate, decorative part for eyewear and process of preparation thereof
CN104441713A (zh) * 2013-09-25 2015-03-25 玛珠舍利1849股份公司 具有混色的基于纤维素乙酸酯的产品的制造方法以及用该方法获得的例如眼镜等产品
US20150085242A1 (en) * 2013-09-25 2015-03-26 Mazzucchelli 1849 S.P.A. Manufacturing process of a product based on cellulose acetate with blended colour, and product, such as spectacles, obtained by such process
US9776345B2 (en) * 2013-09-25 2017-10-03 Mazzucchelli 1849 S.P.A. Manufacturing process of a product based on cellulose acetate with blended colour
WO2024012892A1 (en) * 2022-07-15 2024-01-18 Luxottica S.R.L. Frame for eyeglasses and method for providing the frame

Also Published As

Publication number Publication date
DE1905293A1 (de) 1970-08-06
FR2032711A5 (de) 1970-11-27

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