Nothing Special   »   [go: up one dir, main page]

GB2078600A - A Method of Assembling Plastics Units - Google Patents

A Method of Assembling Plastics Units Download PDF

Info

Publication number
GB2078600A
GB2078600A GB8116927A GB8116927A GB2078600A GB 2078600 A GB2078600 A GB 2078600A GB 8116927 A GB8116927 A GB 8116927A GB 8116927 A GB8116927 A GB 8116927A GB 2078600 A GB2078600 A GB 2078600A
Authority
GB
United Kingdom
Prior art keywords
units
unit
moulding
temperature
outer frame
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.)
Granted
Application number
GB8116927A
Other versions
GB2078600B (en
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.)
Polyplastics Co Ltd
Original Assignee
Polyplastics Co Ltd
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 Polyplastics Co Ltd filed Critical Polyplastics Co Ltd
Publication of GB2078600A publication Critical patent/GB2078600A/en
Application granted granted Critical
Publication of GB2078600B publication Critical patent/GB2078600B/en
Expired legal-status Critical Current

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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • B29C65/665—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using shrinking during cooling
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7377—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
    • B29C66/73775—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline
    • B29C66/73776—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline the to-be-joined areas of both parts to be joined being crystalline
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B29C2071/022—Annealing
    • 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
    • B29K2059/00—Use of polyacetals, e.g. POM, i.e. polyoxymethylene or derivatives thereof, as moulding material
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/22—Hinges, pivots

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • General Details Of Gearings (AREA)
  • Retarders (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

A method of assembling plastics units made of a crystalline thermoplastic resin, said units comprising an outer frame unit having sockets 2 or projections engaging corresponding projections 4 or sockets in an inner unit 3, characterised in that the said outer unit is moulded at a lower temperature than the said inner unit, the moulded units are then assembled one inside the other to provide a loose engagement between them, and the assembled units are annealed at an elevated temperature whereby the engagement of the said units to each other becomes more secure due to differential contraction of the said inner and frame units. The method is useful for assembling plastics units made of a polyacetal resin. <IMAGE>

Description

SPECIFICATION A Method of Assembling Plastics Units The The present invention relates to a method of assembling engageable resin-moulded units ' made of crystalline thermoplastic resin, e.g. a spolyacetal, whereby the engagement between the units is strengthened. More particularly the invention relates to a method of assembling such units by an annealing operation which utilizes differences in the moulding contraction rate taking place during the annealing operation.
It is known that when a crystalline thermoplastic resin is melted and then moulded and solidified, its volume is reduced. This is because the degree of crystallization increases as solidification proceeds from the amorphous melt.
Such contraction of the moulded units is hereinafter described for a polyacetal copolymer, which is an example of a crystalline thermoplastic resin. Polyacetal copolymer is an engineering plastics material which has improved mechanical strength and mouidability and has a balanced combination of creep, fatigue, abrasion, heat and chemical resistance and dimensional stability.
Since a polyacetal resin crystallizes to a high degree, its moulding contraction rate is correspondingly large.
The contraction rate of a moulding depends on the moulding conditions, as well as the shape of the moulding and the annealing temperature. The contraction rate as a function of mould temperature of polyacetal copolymer can be demonstrated as follows. Assume that the thickness of the moulding is 5 mm and the annealing step after the moulding operation is carried out at 1 5000 for 20 hours. With a moulding temperature of 300C the contraction rate on annealing is 0.70%. With a moulding temperature of 8000 however, the contraction rate on annealing is only 0.41%. Thus the moulding temperature affects the contraction rate to a great extent.
Such differential rates provide the basis of the present invention. Thus if the moulding of an outer frame unit of crystalline thermoplastic resin and having inside engaging portions e.g.
concavities, is carried out at a lower temperature than that of an inner engageable unit having corresponding engaging portions e.g. convexities, the outer frame of the assembled unit will contract to a greater degree than the inner unit mounted therein when subjected to an annealing step. Thus the inner unit becomes more securely engaged to the outer frame unit.
Thus the invention provides a method of assembling plastics units made of a crystalline thermoplastic resin, said units comprising an outer frame unit having sockets or projections engaging corresponding projections or sockets in an inner unit, characterised in that the said outer unit is moulded at a lower temperature than the said inner unit, the moulded units are then assembled one inside the other to provide a loose engagement between them, and the assembled units are annealed at an elevated temperature whereby the engagement of the said units to each other becomes more secure due to differential contraction of the said inner and frame units.
In applying the method of the invention to frame and inner units of a polyacetal resin, if the moulding temperature of the low-temperature mould for moulding the outer frame unit is less than 5000 and the moulding temperature of the high-temperature mould for moulding the inner engaging unit to be engaged into the outer frame unit is 5000 or more and the annealing temperature is 1 5000 for 20 hours, the difference in the contraction rate caused is about 0.3%, although the precise figure depends upon the thickness of the mouldings.
Two embodiments of the invention are hereinafter described and illustrated in the accompanying drawings, of which Figure 1 (a) is a plan view of an outer frame body 1, containing two concavities 2, each disposed in opposite internal surfaces of the frame; Figure 1 (B) is a plan view of a flap 3 to be engaged into the said outer frame body 1, by two corresponding convex projections, each disposed on opposite side faces of the flap 3.
If the said engageable units are fitted into each other so that the projections 4 snap fit into the cavities 2 the clearance tr between the frame body 1 and the flap 3 is as shown in Figure 2 (A) and is sufficiently loose so that the flap 3 is likely to disengage from the frame body 1 during use.
By the application of the method of the invention, the clearance after annealing is greatly tightened, as shown at t2 in Figure 2 (B), thus obviating disengagement during use.
An alternative configuration of units is shown in Figures 3 (A) and 3 (B). Figure 3 (A) shows a frame body 1 having convex-shaped engaging portions 5 on its inner side. Figure 3 (B) shows an inner flap 3 having concave portions 6 corresponding to the convex-shaped engaging portions 5.
Claims
1. A method of assembling plastics units made of a crystalline thermoplastic resin, said units comprising an outer frame unit having sockets or projections engaging corresponding projections or sockets in an inner unit, characterised in that the said outer unit is moulded at a lower temperature than the said inner unit, the moulded units are then assembled one inside the other to provide a loose engagement between them, and the assembled units are annealed at an elevated temperature whereby the engagement of the said units to each other becomes more secure due to differential contraction of the said inner and frame units.
2. A method according to Claim 1, wherein the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A Method of Assembling Plastics Units The The present invention relates to a method of assembling engageable resin-moulded units ' made of crystalline thermoplastic resin, e.g. a spolyacetal, whereby the engagement between the units is strengthened. More particularly the invention relates to a method of assembling such units by an annealing operation which utilizes differences in the moulding contraction rate taking place during the annealing operation. It is known that when a crystalline thermoplastic resin is melted and then moulded and solidified, its volume is reduced. This is because the degree of crystallization increases as solidification proceeds from the amorphous melt. Such contraction of the moulded units is hereinafter described for a polyacetal copolymer, which is an example of a crystalline thermoplastic resin. Polyacetal copolymer is an engineering plastics material which has improved mechanical strength and mouidability and has a balanced combination of creep, fatigue, abrasion, heat and chemical resistance and dimensional stability. Since a polyacetal resin crystallizes to a high degree, its moulding contraction rate is correspondingly large. The contraction rate of a moulding depends on the moulding conditions, as well as the shape of the moulding and the annealing temperature. The contraction rate as a function of mould temperature of polyacetal copolymer can be demonstrated as follows. Assume that the thickness of the moulding is 5 mm and the annealing step after the moulding operation is carried out at 1 5000 for 20 hours. With a moulding temperature of 300C the contraction rate on annealing is 0.70%. With a moulding temperature of 8000 however, the contraction rate on annealing is only 0.41%. Thus the moulding temperature affects the contraction rate to a great extent. Such differential rates provide the basis of the present invention. Thus if the moulding of an outer frame unit of crystalline thermoplastic resin and having inside engaging portions e.g. concavities, is carried out at a lower temperature than that of an inner engageable unit having corresponding engaging portions e.g. convexities, the outer frame of the assembled unit will contract to a greater degree than the inner unit mounted therein when subjected to an annealing step. Thus the inner unit becomes more securely engaged to the outer frame unit. Thus the invention provides a method of assembling plastics units made of a crystalline thermoplastic resin, said units comprising an outer frame unit having sockets or projections engaging corresponding projections or sockets in an inner unit, characterised in that the said outer unit is moulded at a lower temperature than the said inner unit, the moulded units are then assembled one inside the other to provide a loose engagement between them, and the assembled units are annealed at an elevated temperature whereby the engagement of the said units to each other becomes more secure due to differential contraction of the said inner and frame units. In applying the method of the invention to frame and inner units of a polyacetal resin, if the moulding temperature of the low-temperature mould for moulding the outer frame unit is less than 5000 and the moulding temperature of the high-temperature mould for moulding the inner engaging unit to be engaged into the outer frame unit is 5000 or more and the annealing temperature is 1 5000 for 20 hours, the difference in the contraction rate caused is about 0.3%, although the precise figure depends upon the thickness of the mouldings. Two embodiments of the invention are hereinafter described and illustrated in the accompanying drawings, of which Figure 1 (a) is a plan view of an outer frame body 1, containing two concavities 2, each disposed in opposite internal surfaces of the frame; Figure 1 (B) is a plan view of a flap 3 to be engaged into the said outer frame body 1, by two corresponding convex projections, each disposed on opposite side faces of the flap 3. If the said engageable units are fitted into each other so that the projections 4 snap fit into the cavities 2 the clearance tr between the frame body 1 and the flap 3 is as shown in Figure 2 (A) and is sufficiently loose so that the flap 3 is likely to disengage from the frame body 1 during use. By the application of the method of the invention, the clearance after annealing is greatly tightened, as shown at t2 in Figure 2 (B), thus obviating disengagement during use. An alternative configuration of units is shown in Figures 3 (A) and 3 (B). Figure 3 (A) shows a frame body 1 having convex-shaped engaging portions 5 on its inner side. Figure 3 (B) shows an inner flap 3 having concave portions 6 corresponding to the convex-shaped engaging portions 5. Claims
1. A method of assembling plastics units made of a crystalline thermoplastic resin, said units comprising an outer frame unit having sockets or projections engaging corresponding projections or sockets in an inner unit, characterised in that the said outer unit is moulded at a lower temperature than the said inner unit, the moulded units are then assembled one inside the other to provide a loose engagement between them, and the assembled units are annealed at an elevated temperature whereby the engagement of the said units to each other becomes more secure due to differential contraction of the said inner and frame units.
2. A method according to Claim 1, wherein the said plastics units are made of a polyacetal resin.
3. An assembly of a frame unit and inner unit obtained by a method according to Claim 1 or Claim 2.
GB8116927A 1980-06-19 1981-06-03 A method of assembling plastics units Expired GB2078600B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55083391A JPS6040973B2 (en) 1980-06-19 1980-06-19 Assembly method of crystalline resin molded parts

Publications (2)

Publication Number Publication Date
GB2078600A true GB2078600A (en) 1982-01-13
GB2078600B GB2078600B (en) 1983-10-12

Family

ID=13801121

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8116927A Expired GB2078600B (en) 1980-06-19 1981-06-03 A method of assembling plastics units

Country Status (4)

Country Link
JP (1) JPS6040973B2 (en)
KR (1) KR830001836B1 (en)
GB (1) GB2078600B (en)
HK (1) HK85684A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1014662A5 (en) * 2002-02-11 2004-02-03 Ips Nv Supporting structure PLASTIC AND METHOD FOR MANUFACTURING THEREOF.
EP2113372A1 (en) 2008-04-30 2009-11-04 Jesa SA Improved bi-material mechanical part

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01178439A (en) * 1988-01-08 1989-07-14 Yamazaki Sangyo Kk Method for mounting member to synthetic resin molded product
JPH01298657A (en) * 1988-05-27 1989-12-01 Matsushita Electric Ind Co Ltd Sealed lead storage battery
IT1278381B1 (en) * 1995-02-22 1997-11-20 Selle San Marco Di Girardi Com BICYCLE SADDLE AND PROCEDURE FOR ITS MANUFACTURE
CA2598621C (en) 2005-03-02 2010-10-26 Toyota Jidosha Kabushiki Kaisha Gas container and method of producing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1014662A5 (en) * 2002-02-11 2004-02-03 Ips Nv Supporting structure PLASTIC AND METHOD FOR MANUFACTURING THEREOF.
EP2113372A1 (en) 2008-04-30 2009-11-04 Jesa SA Improved bi-material mechanical part

Also Published As

Publication number Publication date
JPS6040973B2 (en) 1985-09-13
HK85684A (en) 1984-11-16
JPS578112A (en) 1982-01-16
KR830001836B1 (en) 1983-09-14
GB2078600B (en) 1983-10-12

Similar Documents

Publication Publication Date Title
DE3586117D1 (en) MANUFACTURING OF POLYETHYLENE MORPHOLOGIES OF TOTALLY MOLTEN PARTICLES, ULTRA-HIGH MOLECULAR WEIGHT AND WITH EXCELLENT MECHANICAL PERFORMANCE.
US3136000A (en) Mold for producing lenses and lens blanks from polymerizable materials
GB2078600A (en) A Method of Assembling Plastics Units
CA2020003A1 (en) Biaxially-oriented polypropylene film with high mechanical strength
UA19102A (en) Method for the manufacture of bristle articles
JPH0757500B2 (en) How to insert a piece into a preform mouth mold
ES548589A0 (en) PROCEDURE FOR THE MANUFACTURE OF MOLDS IN METAL WITH A HIGH FUSION POINT, BY SPRAYING SUCH METAL ON A FORM IN THE CHARGED SILICONE ELASTOMER
GB2324839A (en) Seal for rolling bearing
KR950017150A (en) Manufacturing method of insert molding body using fluorocarbon resin as surface material
JP2000061947A (en) Insert molding method of terminal in resin molding, connector, and motor
US5628519A (en) Oil seal ring of synthetic resin having angularly displaced injection point
EP1667832B1 (en) Method of moulding a hinge
US4227673A (en) Gasket for casting lenses
GB2070702A (en) Method of making a floating sheath of a mechanical seal
CA2326400A1 (en) Insert molding of a liquid-containing member, such as a level vial, and an article of manufacture formed thereby
JPS62148219A (en) Injection molding of gear
EP0319401A3 (en) Method of producing a shrinkable film
US5645294A (en) Wheel steering axis inclination, caster, and camber adjustment assembly seal and protective cover
GB2087637A (en) Introducing Terminals Through Battery Covers
JPH02175419A (en) Manufacture of hard plate insert module assembly window
CN212131433U (en) Balanced subassembly of breather valve
GB2235408A (en) Contact lens mould
GB2236160A (en) Leaf spring assemblies
JPH07208261A (en) Method for forming cylinder head cover
KR940002032A (en) Molding member manufacturing method and molding member manufactured by the method

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940603