GB1378319A - Moulding of plastics articles - Google Patents
Moulding of plastics articlesInfo
- Publication number
- GB1378319A GB1378319A GB939472A GB939472A GB1378319A GB 1378319 A GB1378319 A GB 1378319A GB 939472 A GB939472 A GB 939472A GB 939472 A GB939472 A GB 939472A GB 1378319 A GB1378319 A GB 1378319A
- Authority
- GB
- United Kingdom
- Prior art keywords
- temperature
- briquette
- powder
- polymers
- forging
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/02—Combined thermoforming and manufacture of the preform
-
- 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
- B29C43/16—Forging
-
- 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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
- B29C67/205—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising surface fusion, and bonding of particles to form voids, e.g. sintering
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/001—Shaping in several steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0658—PE, i.e. polyethylene characterised by its molecular weight
- B29K2023/0683—UHMWPE, i.e. ultra high molecular weight polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/251—Particles, powder or granules
Abstract
1378319 Forging sintered plastics DOW CHEMICAL CO 29 Feb 1972 [1 March 1971] 9394/72 Heading B5A [Also in Division B8] A thermoplastic article, e.g. a container, is formed by compressing thermoplastics powder into a coherent briquette, Fig. 1, which, at a temperature between the alpha transition and melting temperature of the powder, is sintered and then forged directly into the article, Fig. 1A (not shown), or forged into a preform which is subsequently formed into the article. The alpha transition temperature is defined, for amorphous polymers, as the glass transition temperature, and for crystalline polymers as the temperature between the glass transition and melting temperature at which the first energy loss peak is observed. The powder is preferably one that compresses at 30,000 p.s.i. to at least 85% of its molten density, and the forging temperature is preferably 2‹ or 5‹ C. below the melting point, with forging effected in a mould at the same temperature as the briquette. A preform may be cooled for subsequent forming, or directly transferred to a thermoforming mould in a clamp ring with the centre of the preform maintained at its forming temperature and the periphery within the ring being below the alpha transition. The heating of the powder may be effected prior to, or subsequent to its formation into the briquette, e.g. in an oven in which the sintering is effected. The preform may be formed to the article by the differential air pressure means 20 shown, or by forming by vacuum, matched dies, plug assist vacuum, drawing, impact, rubber pad, or fluid. Orientation in the article may be increased by fusion occurring earlier in the forging process. The examples relate to the moulding of containers from: (1)-(3), high density polyethylene; (4) and (5), foamed high density polyethylene; (6) and (7), the same high density polyethylene with different proportions of vinylidene chloride/ methyl acrylate co-polymer to form a barrier container as in Fig. 4; (8) and (9), a surface layer of the material of Ex. (6) with either an inner layer of the co-polymer of Ex. (6), or of the material of Ex. (4) to form a barrier container as in Fig. 5; (10) and (14), acrylonitrile butadiene styrene terpolymer; (11), vinyl chloride/ vinyl acetate co-polymer; (12) the solution recrystallized material of Ex. (1); (13) the material of Ex. (1), solution polymerized and precipitated; (15), a surface layer of the material of Ex. (1), an inner layer of the material of Ex. (4). Other polymers which may be employed are polystyrene, polyvinyl chloride, polyvinylidene chloride, vinyl chloride/vinyl acetate co-polymers, and co-polymers of vinylidene chloride with vinyl chloride, and acrylonitrile. During forging, a lubricant may be employed such as potassium oleate, silicone grease and oils wiped on the mould or briquette, or particulate P.T.F.E. or zinc stearate sprayed on to the mould, or a P.T.F.E. coat baked on to the mould, or a film of low density polyethylene laid loosely around a polyvinylidene briquette. With a foamable material, a dry blended mixture of the powder and a chemical blowing agent is employed, with foaming accuring after opening of the forging press. The powder may incorporate pigments, flame-retardants, metals, glasses, ceramics, glass-fibres or platelets, or magnetic particles. Powder mixtures may also comprise polystyrene with acrylonitrile homopolymers or co-polymers. Articles comprising multiple layers of different materials, are formed by sequential compression of each layer in the briquette. The briquette may be inked or distortion printed. The articles may also comprise gears, bushings, bearing bushings, and fan blades which change pitch as a function of temperature.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11966971A | 1971-03-01 | 1971-03-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1378319A true GB1378319A (en) | 1974-12-27 |
Family
ID=22385652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB939472A Expired GB1378319A (en) | 1971-03-01 | 1972-02-29 | Moulding of plastics articles |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS552335B1 (en) |
BE (1) | BE780018A (en) |
CA (1) | CA989127A (en) |
DE (1) | DE2209608C2 (en) |
FR (1) | FR2128346B1 (en) |
GB (1) | GB1378319A (en) |
IT (1) | IT948784B (en) |
NL (1) | NL167895C (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0027914A1 (en) * | 1979-10-25 | 1981-05-06 | Ball Corporation | An oriented Plastics preform for making an open mouth container |
GB2191730A (en) * | 1986-06-18 | 1987-12-23 | Wheeling Stamping Co | A method of forming the head of a thermoplastic container |
US4898708A (en) * | 1986-05-02 | 1990-02-06 | Wheeling Stamping Company | Method for shaping closed bottom of tubular container |
EP1115569A1 (en) * | 1998-08-06 | 2001-07-18 | SIG Combibloc, Inc. | Containers prepared from laminate structures having a foamed polymer layer |
EP1377401A1 (en) | 2000-07-25 | 2004-01-07 | CK Management AB UB | A method of producing a metal body by coalescence and the metal body produced |
CN107326808A (en) * | 2017-07-14 | 2017-11-07 | 西申(上海)新材料科技有限公司 | A kind of bridge pad equipressure sintering machine resistance to compression induced dies |
CN107403668A (en) * | 2017-08-04 | 2017-11-28 | 镇江春环密封件集团有限公司 | A kind of polytetrafluoroethylene film mould |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61100422U (en) * | 1984-12-07 | 1986-06-26 | ||
DE19542717C1 (en) * | 1995-11-16 | 1997-03-20 | Bernd Friemuth | Process produces sales trays from cut polystyrene foam blanks by hot- plane and hot form stamping |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL208935A (en) * | 1956-06-21 | |||
BE558891A (en) * | 1957-06-21 | |||
NL232972A (en) * | 1957-11-08 | |||
DE1704292A1 (en) * | 1966-02-03 | 1971-05-06 | Shell Int Research | Process for molding objects from thermoplastics |
US3488747A (en) * | 1967-02-13 | 1970-01-06 | Dow Chemical Co | Impact rotational molding |
DE1704144A1 (en) * | 1967-07-14 | 1971-05-06 | Kabel Metallwerke Ghh | Method and device for producing molded articles from polyamides |
-
1972
- 1972-02-16 CA CA134,858A patent/CA989127A/en not_active Expired
- 1972-02-22 FR FR7205877A patent/FR2128346B1/fr not_active Expired
- 1972-02-29 GB GB939472A patent/GB1378319A/en not_active Expired
- 1972-02-29 IT IT4865872A patent/IT948784B/en active
- 1972-02-29 DE DE19722209608 patent/DE2209608C2/en not_active Expired
- 1972-02-29 BE BE780018A patent/BE780018A/en not_active IP Right Cessation
- 1972-03-01 JP JP2143072A patent/JPS552335B1/ja active Pending
- 1972-03-01 NL NL7202727A patent/NL167895C/en not_active IP Right Cessation
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0027914A1 (en) * | 1979-10-25 | 1981-05-06 | Ball Corporation | An oriented Plastics preform for making an open mouth container |
US4898708A (en) * | 1986-05-02 | 1990-02-06 | Wheeling Stamping Company | Method for shaping closed bottom of tubular container |
GB2191730A (en) * | 1986-06-18 | 1987-12-23 | Wheeling Stamping Co | A method of forming the head of a thermoplastic container |
GB2191730B (en) * | 1986-06-18 | 1989-12-13 | Wheeling Stamping Co | Method of forming thermoplastic headed tubular containers |
EP1115569A1 (en) * | 1998-08-06 | 2001-07-18 | SIG Combibloc, Inc. | Containers prepared from laminate structures having a foamed polymer layer |
EP1115569A4 (en) * | 1998-08-06 | 2007-08-08 | Sig Combibloc Inc | Containers prepared from laminate structures having a foamed polymer layer |
EP1385660A1 (en) | 2000-07-25 | 2004-02-04 | CK Management AB UB | A method of producing a multilayer body by coalescence and the multilayer body produced |
EP1399599A1 (en) | 2000-07-25 | 2004-03-24 | CK Management AB UB | A method of producing a ceramic body by coalescence and the ceramic body produced |
EP1417058A1 (en) | 2000-07-25 | 2004-05-12 | CK Management AB UB | A method of producing a polymer body by coalescence and the polymer body produced |
EP1417057A1 (en) | 2000-07-25 | 2004-05-12 | CK Management AB UB | A method of producing a composite body by coalescence and the composite body produced |
EP1377401A1 (en) | 2000-07-25 | 2004-01-07 | CK Management AB UB | A method of producing a metal body by coalescence and the metal body produced |
CN107326808A (en) * | 2017-07-14 | 2017-11-07 | 西申(上海)新材料科技有限公司 | A kind of bridge pad equipressure sintering machine resistance to compression induced dies |
CN107403668A (en) * | 2017-08-04 | 2017-11-28 | 镇江春环密封件集团有限公司 | A kind of polytetrafluoroethylene film mould |
Also Published As
Publication number | Publication date |
---|---|
BE780018A (en) | 1972-08-29 |
FR2128346B1 (en) | 1975-10-24 |
IT948784B (en) | 1973-06-11 |
FR2128346A1 (en) | 1972-10-20 |
DE2209608C2 (en) | 1982-11-04 |
NL7202727A (en) | 1972-09-05 |
CA989127A (en) | 1976-05-18 |
JPS552335B1 (en) | 1980-01-19 |
DE2209608A1 (en) | 1972-09-21 |
NL167895B (en) | 1981-09-16 |
NL167895C (en) | 1982-02-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |