GB645356A - Process and apparatus for shaping thermoplastic sheet material to form frames - Google Patents
Process and apparatus for shaping thermoplastic sheet material to form framesInfo
- Publication number
- GB645356A GB645356A GB1852847A GB1852847A GB645356A GB 645356 A GB645356 A GB 645356A GB 1852847 A GB1852847 A GB 1852847A GB 1852847 A GB1852847 A GB 1852847A GB 645356 A GB645356 A GB 645356A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frame
- dies
- recesses
- boundaries
- projections
- 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
Links
Classifications
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/20—Making multilayered or multicoloured articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D12/00—Producing frames
- B29D12/02—Spectacle frames
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
- B29C2043/023—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having a plurality of grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2012/00—Frames
- B29L2012/005—Spectacle frames
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
645,356. Moulding spectacle and other frames from thermoplastic sheet material. MONCRIEFF, L. J. July 11, 1947, No. 18528. [Class 87 (ii)] Frames for spectacles, small mirrors, handlenses, &c. are simultaneously blanked and moulded from cellulose acetate sheet or other thermoplastic sheet of a thickness less than the maximum thickness of the frame by a pair of dies which when closed meet along lines which define the boundaries of the frame and also meet over marginal areas immediately outside the boundaries. The sheet material lying in these areas is thus trapped and some is squeezed sideways across the boundaries to augment the thickness of the frame. Figs. 3 and 7 are cross-sections of two pairs of dies for moulding spectacle frames. In Fig. 3 the upper die has two flat projections 15, for blanking out the eye-piece apertures, which slightly overlap recesses 10 in the lower die which receive waste material. Upstanding ridges 9 with flat tops, whose inner contour corresponds to the outer contour of the frame are provided on the lower die by mounting a plate 4 thereon, suitably machined to shape. Nose-piece projections and recesses 6 and nose-pad recesses 13 are provided in the appropriate dies. A sheet 17, which may be preheated of thickness less than that of the finished frame is positioned between the dies which are then closed, being mounted in a suitable press for this purpose. Material is trapped between the ridges 9 and the upper die and the overlapping portions of the projections 15 and recesses 10, and some of it is squeezed sideways into the mould cavity. The dies have channels 2 for the circulation of heating and cooling fluid and passages 12 allow the recesses 10 to communicate with the atmosphere to vent the recesses 10 and permit escape of waste material if the recesses are not sufficiently large. In Fig. 7 the blanking projections 24 for the eye-pieces are mounted on a plate 23 contoured to a size slightly larger than the inner boundaries of a plate 22 which conform to the outer boundaries of the frame to be moulded. Overlapping boundary portions are thus provided as before. Suitable projections and recesses for the nose bridge and pads are also provided. Heating and cooling passages are provided in the dies but not passages 12, the recesses 25 being made larger. If it is found that there is insufficient back pressure to squeeze sufficient material over the inner boundaries, small packing pieces 28 may be introduced into the recesses 25. Instead of positively cooling the dies, reliance may be placed on air cooling. Alternatively two presses may be used, one heated and the other cooled. After pressing out a frame in the hot press the dies are transferred to the cold press and kept under pressure until cool, a second set of dies being inserted into the hot press while the others cool, the dies being heated only by conduction from the press. A comprehensive list of suitable moulding materials is given, including cellulose derivatives and synthetic resins such as polymethyl-methacrylate and polyvinyl chloride and acetate. According to the Provisional Specification material from the inside only of the frame is transferred across the inner frame boundary to augment the thickness of the frame and one or other of the die members carried cutting edges for cutting the sheet at the outer boundary of the frame. Also, the bores for escape of excess material may be formed in either die member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1852847A GB645356A (en) | 1947-07-11 | 1947-07-11 | Process and apparatus for shaping thermoplastic sheet material to form frames |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1852847A GB645356A (en) | 1947-07-11 | 1947-07-11 | Process and apparatus for shaping thermoplastic sheet material to form frames |
Publications (1)
Publication Number | Publication Date |
---|---|
GB645356A true GB645356A (en) | 1950-11-01 |
Family
ID=10113975
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1852847A Expired GB645356A (en) | 1947-07-11 | 1947-07-11 | Process and apparatus for shaping thermoplastic sheet material to form frames |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB645356A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUD20090197A1 (en) * | 2009-11-11 | 2011-05-12 | Sari S R L | PROCEDURE FOR THE REALIZATION OF A COMPONENT IN PLASTIC MATERIAL BASED ON ACETATE, AND A COMPONENT SO AS REALIZED |
ITBO20100068A1 (en) * | 2010-02-08 | 2011-08-09 | Luxottica Srl | APPARATUS AND PROCEDURE FOR REALIZING A FRAME OF GLASSES IN THERMOPLASTIC MATERIAL. |
WO2017177348A1 (en) * | 2016-04-14 | 2017-10-19 | 王道敏 | Novel process for embossing 3d patterns on surface of spectacle frame |
-
1947
- 1947-07-11 GB GB1852847A patent/GB645356A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUD20090197A1 (en) * | 2009-11-11 | 2011-05-12 | Sari S R L | PROCEDURE FOR THE REALIZATION OF A COMPONENT IN PLASTIC MATERIAL BASED ON ACETATE, AND A COMPONENT SO AS REALIZED |
EP2322343A1 (en) * | 2009-11-11 | 2011-05-18 | Sari SRL | Method to make a component of acetate-based plastic material and component thus made |
ITBO20100068A1 (en) * | 2010-02-08 | 2011-08-09 | Luxottica Srl | APPARATUS AND PROCEDURE FOR REALIZING A FRAME OF GLASSES IN THERMOPLASTIC MATERIAL. |
WO2011095917A1 (en) * | 2010-02-08 | 2011-08-11 | Luxottica S.R.L. | Apparatus and process for forming a spectacle frame |
WO2017177348A1 (en) * | 2016-04-14 | 2017-10-19 | 王道敏 | Novel process for embossing 3d patterns on surface of spectacle frame |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2432668A (en) | Production of optical lenses, prisms, and like optical elements | |
GB1424338A (en) | Moulding device | |
US1531504A (en) | Process of making articles of celluloid and similar material | |
GB645356A (en) | Process and apparatus for shaping thermoplastic sheet material to form frames | |
US2680882A (en) | Apparatus and method of making goggles | |
US3041668A (en) | Methods for forming sheet plastics | |
FR2397278A1 (en) | PROCESS AND MOLD FOR THE MANUFACTURING OF SYNTHETIC MATERIALS OF EYEWEAR FRAMES | |
GB1136613A (en) | Improvements in or relating to the molding of articles from thermoplastic resin sheet material | |
US1883704A (en) | Ball covering process | |
CN108081579A (en) | A kind of acetate fiber fat lens surface thermocompression stereo processing patterns method | |
US2463401A (en) | Apparatus for transfer molding | |
GB1166381A (en) | Method of Forming a Thermoplastic Article. | |
US2483832A (en) | Method of manufacturing artificial eyes | |
US3613174A (en) | Apparatus for producing molded printing plates | |
GB1334378A (en) | Method of and apparatus for the formation of sheets foils or plates from synthetic thermoplastics material | |
GB991830A (en) | Improvements in or relating to the vacuum-forming and pressure-forming of thermoplastic films | |
GB655525A (en) | Improvements in method of making liquid filled golf ball cores and other rubber shells | |
JPH0320075Y2 (en) | ||
JPS6479026A (en) | Lens molding device | |
US3551953A (en) | Transfer press | |
US3427970A (en) | Method of producing molded printing plates | |
CN206616137U (en) | A kind of 3D products hot bending die | |
GB620317A (en) | New or improved process and apparatus for the moulding of contact lenses | |
GB502685A (en) | Improvements in and relating to the manufacture of rubber footwear | |
JPH0214405Y2 (en) |