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GB2266261A - Twin sheet formed bath (TSFP) - Google Patents

Twin sheet formed bath (TSFP) Download PDF

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Publication number
GB2266261A
GB2266261A GB9208583A GB9208583A GB2266261A GB 2266261 A GB2266261 A GB 2266261A GB 9208583 A GB9208583 A GB 9208583A GB 9208583 A GB9208583 A GB 9208583A GB 2266261 A GB2266261 A GB 2266261A
Authority
GB
United Kingdom
Prior art keywords
bath
tsfp
thermoformed
tub
twin
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
GB9208583A
Other versions
GB2266261B (en
GB9208583D0 (en
Inventor
Klaus Juergen Fikeis
Roger Folkard
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9208583A priority Critical patent/GB2266261B/en
Publication of GB9208583D0 publication Critical patent/GB9208583D0/en
Publication of GB2266261A publication Critical patent/GB2266261A/en
Application granted granted Critical
Publication of GB2266261B publication Critical patent/GB2266261B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/266—Auxiliary operations after the thermoforming operation
    • B29C51/267—Two sheets being thermoformed in separate mould parts and joined together while still in the mould
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K3/00—Baths; Douches; Appurtenances therefor
    • 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
    • B29C51/006—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 for making articles having hollow walls
    • 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/022—Particular heating or welding methods not otherwise provided for
    • B29C65/028—Particular heating or welding methods not otherwise provided for making use of inherent heat, i.e. the heat for the joining comes from the moulding process of one 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/545—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles one hollow-preform being placed inside the other
    • 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
    • B29D24/00—Producing articles with hollow walls
    • 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B29C66/7212—Fibre-reinforced materials characterised by the composition of the fibres
    • 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
    • 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
    • B29L2024/00—Articles with hollow walls
    • 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
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7126—Containers; Packaging elements or accessories, Packages large, e.g. for bulk storage
    • 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
    • B29L2031/769—Sanitary equipment
    • B29L2031/7692—Baths

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

A twin formed bath consists of a twin sheet thermoforming construction, where the bath tub 10 together with a support liner 11 are thermoformed and welded together simultaneously at one operation. Features such as rim frame and base board can be integrated into the construction. <IMAGE>

Description

TWIN SHEET FORMED PLASTIC BATH (TSFP BATH) This invention relates to bath design, construction and manufacture.
Baths currently available in the market place are of 4 main manufacturing methods.
A) Bath tub thermoformed from single or multilayer thermoplastic is subsequently reinforced with fibre glass either sprayed or layered, both encapsulating a base board and securing a rim frame of wood or steel. The legs are secured to the rim frame.
B) Bath tub thermoformed from single or multilayer thermoplastic sheet which is reinforced by application of a reactive polymer based foam system layer. This process (RIM) reaction injection moulding involves the tub form being enclosed to one side of a cavity between male/female moulds and the remaining cavity being filled by injected PU foam.
The foam forms a controlled layer, requiring no rim frame and encapsulating the base board and securing fasteners for the legs.
C) Bath tub and separate support thermoformed from individual thermoplastic sheets which are assembled on-site with or without adhesive.
D) Bath tub thermoformed from multi-layer sheet. This thicker sheet does not require reinforcement, only attachment of base board and rim frame by adhesive. The legs are again secured to the rim frame.
These 4 methods have the follow drawbacks which are causing the bath manufacturers to search for alternatives.
A) Reinforcement by fibre glass is an extremely messy, unpleasant and unhealthy operation. Moves to prohibit this practice are nearing legislation, as it is environmentally undesirable.
B) Reaction polymer based foam systems (RIM) baths require complex, expensive capital equipment and have a long process time and consequently are very expensive. Also scrap products cannot be reprocessed.
C) Bath tub plus a separate thermoformed support requires two sets of machine cycles to produce one finished product and mismatch of individually produced forms cause problems at installation assembly and in service.
D) Costly, high content of sheet, but easy to manufacture.
According to the present invention - The bath tub consists of a twin sheet thermoforming construction, were the normal tub together with an outer support liner are thermoformed and welded together simultaneously.
- A feature in the liner rim area allows a fixing point for facing panels at installation.
- Inserts formed into the liner allow anchor points for the legs at installation.
- Features such as rim frame and base board can be integrated in the construction.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which: Figure 1 shows a plan view ~of the bath tub and support liner assembly in trimmed condition ready for installation.
Figure 2 is a section view showing the configuration of the support liner and its relationship to the tub.
Figure 3 is a detailed section view showing the rim edge construction, particularly the weld areas.
Referring to the drawing, two individual thermoplastic sheets have been simultaneously thermoformed and welded together by application of a combined twin sheet/pressure/vacuum thermoforming process to comprise one twin sheet bath tub assembly.
The bath tub 10 has been thermoformed from the upper sheet onto a male mould, and the support liner 11 has been thermoformed from the lower sheet into a female mould as the two moulds are closing.
At final closing, a pressure is applied achieving a weld at the designated areas 12,13,14,15 and 16.
Flat welded areas for waste hole 14, overflow hole 15 and taps 16 are produced for fitment of same.
A non-slip pattern 17 when desired is formed in the tub base coinciding to the weld areas.
18 Cavity links 1 are formed in the weld areas to allow venting, so preventing air pressure variation when the bath is heated and cooled in service.
Inserts 19 can be formed into the support liner for securing legs at installation.
Surplus sheet material 20 at the rim is trimmed.

Claims (6)

1. A TSFP bath consists of a twin sheet thermoformed construction, were the bath tub together with an outer support liner are thermoformed and welded together simultaneously.
2. A TSFP bath as claimed in claim 1 wherein twin sheets consist of similar or non-similar thermoplastic sheet compositions.
3. A TSFP bath as claimed in claims 1 and 2 wherein each tub and support liner assembly is produced in one operation in one machine cycle.
4. A TSFP bath-as claimed in claims 1,2 and 3 wherein the weld areas provide all necessary strength, requiring no further reinforcement materials or reinforcement operations.
5. A TSFP bath as claimed in any previous claim wherein such features as rim frame, base board, leg securing inserts and facing panel securing points can be integrated to the forms.
6. A TSFP bath substantially as described herein with reference to figure 1-3 of the accompanying drawing.
GB9208583A 1992-04-21 1992-04-21 Twin sheet formed plastics bath Expired - Fee Related GB2266261B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9208583A GB2266261B (en) 1992-04-21 1992-04-21 Twin sheet formed plastics bath

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9208583A GB2266261B (en) 1992-04-21 1992-04-21 Twin sheet formed plastics bath

Publications (3)

Publication Number Publication Date
GB9208583D0 GB9208583D0 (en) 1992-06-03
GB2266261A true GB2266261A (en) 1993-10-27
GB2266261B GB2266261B (en) 1995-12-13

Family

ID=10714285

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9208583A Expired - Fee Related GB2266261B (en) 1992-04-21 1992-04-21 Twin sheet formed plastics bath

Country Status (1)

Country Link
GB (1) GB2266261B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0618062A2 (en) * 1993-03-10 1994-10-05 Maschinenfabrik Georg Geiss Sanitary article, for example shower basin or bathtub, as well as proces and apparatus for its manufacture
WO2007076558A1 (en) * 2005-12-28 2007-07-05 Bogoljub Bozic Vacuumed-formed or injected sub shell for static reinforcement of bathub shell

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1046776A (en) * 1962-05-11 1966-10-26 Dunlop Rubber Co Improvements in and relating to moulded hot water bottles
WO1987001330A1 (en) * 1985-08-30 1987-03-12 Garwood Ltd. Improved tray for packaging

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294498A (en) * 1979-10-17 1981-10-13 Luit Richard D Van Wall cabinet and method of making
DE69128713T2 (en) * 1991-05-24 1998-04-23 C R S S R L Process for the production of hollow bodies from thermoplastic material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1046776A (en) * 1962-05-11 1966-10-26 Dunlop Rubber Co Improvements in and relating to moulded hot water bottles
WO1987001330A1 (en) * 1985-08-30 1987-03-12 Garwood Ltd. Improved tray for packaging

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0618062A2 (en) * 1993-03-10 1994-10-05 Maschinenfabrik Georg Geiss Sanitary article, for example shower basin or bathtub, as well as proces and apparatus for its manufacture
EP0618062A3 (en) * 1993-03-10 1996-04-24 Geiss Georg Maschf Sanitary article, for example shower basin or bathtub, as well as proces and apparatus for its manufacture.
WO2007076558A1 (en) * 2005-12-28 2007-07-05 Bogoljub Bozic Vacuumed-formed or injected sub shell for static reinforcement of bathub shell

Also Published As

Publication number Publication date
GB2266261B (en) 1995-12-13
GB9208583D0 (en) 1992-06-03

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Legal Events

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

Effective date: 19990421