EP0120031A1 - Tableau a ecrire et son procede de fabrication - Google Patents

Tableau a ecrire et son procede de fabrication

Info

Publication number
EP0120031A1
EP0120031A1 EP83902405A EP83902405A EP0120031A1 EP 0120031 A1 EP0120031 A1 EP 0120031A1 EP 83902405 A EP83902405 A EP 83902405A EP 83902405 A EP83902405 A EP 83902405A EP 0120031 A1 EP0120031 A1 EP 0120031A1
Authority
EP
European Patent Office
Prior art keywords
substrate
writing
frame
aging
molding
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.)
Withdrawn
Application number
EP83902405A
Other languages
German (de)
English (en)
Inventor
Robert E. Burkhalter
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.)
Sanford Research Co
Original Assignee
Sanford Research Co
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 Sanford Research Co filed Critical Sanford Research Co
Publication of EP0120031A1 publication Critical patent/EP0120031A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B32B2266/0228—Aromatic vinyl resin, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/02—Temperature
    • B32B2309/025—Temperature vs time profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2315/00—Other materials containing non-metallic inorganic compounds not provided for in groups B32B2311/00 - B32B2313/04
    • B32B2315/02—Ceramics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2315/00—Other materials containing non-metallic inorganic compounds not provided for in groups B32B2311/00 - B32B2313/04
    • B32B2315/08—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2325/00—Polymers of vinyl-aromatic compounds, e.g. polystyrene

Definitions

  • This invention relates to writing boards or panel drawing boards, and more particularly to molded writing boards and methods for manufacturing thereof. It is known in the prior art to form writing boards such as panel drawing boards and slates from hard materials such as fiberboard, as is exemplified by U.S. Patent No. 2,112,762 issued March 26, 1938, to Chatfield and U.S. Patent No. 2,087,111 issued July 13, 1937,to Mayall. However, the use of fiberboard, Masonite and other hard materials results in a heavier and relatively more expensive writing board. This, in turn, detracts from the commercial use thereof, particularly for slates directed toward in-home use.
  • This sheet of non- porous plastic must be supported and adhered to the frame in such a manner as to prevent the sheet from buck ⁇ ling, bubbling or wrinkling. Bubbling, buckling or wrinkling of the sheet forming the writing surface makes writing upon the surface difficult.
  • the surface deforms in response to the pressure the person exerts on the pen, making the creation of a discrete mark virtually impos ⁇ sible.
  • molded frames heretofore used to support the writing surface were constructed from high density plastics or other strong materials. in order to prevent the sheet writing surface from buckling, bubbling or wrinkling.
  • the use of inexpensive, lightweight plas ⁇ tics such as styrofoam products (STYROFOAM is a Dow Chemical Company trademark for expanded cellular poly ⁇ styrene) for the frame of the writing board was shunned due to certain characteristics. Expanded cellular poly- styrene undergoes dimensional changes subsequent to mold ⁇ ing of the frame as it ages.
  • the present invention is directed toward over ⁇ coming one or more of the problems noted above.
  • a method for constructing a writing board and the writing board so constructed is set forth whereby a lightweight, inexpensive material, such as expanded cellular polystyrene can be used as a substrate for the thin sheet of non-porous plastic writing surface.
  • the writing board so constructed is substantially dimension- ally fixed and therefore supports the writing surface without causing buckling, bubbling or wrinkling.
  • the writing board of the present invention is constructed by molding a light ⁇ weight, inexpensive material such as expanded cellular polystyrene products into a frame, the frame having a planar substrate which will function to support the writ- ing surface.
  • the frame After molding, the frame is aged, with or without the introduction of heat, for a period of time sufficient for the frame and its substrate to become substantially di ensionally fixed. Upon suitable aging, a thin sheet of non-porous plastic is adhered to the substrate, the sheet adapted to function as a writing surface to record written material from dry erase pens and the like.
  • a layer of material is interposed between the writing surface and the substrate to resist damage and add opaque ⁇ ness to the writing surface.
  • one object of the present inven ⁇ tion is to set forth a writing board and method for construction thereof wherein a lightweight, inexpensive frame can be used to support the writing surface, thereby lowering the overall cost of the writing board.
  • the inex ⁇ pensive material is processed such that the dimensional changes as the frame ages which accompanies the use of certain lightweight materials is remedied preventing the writing surface attached thereto from bubbling, buckling or wrinkling.
  • a further object of the present invention is to set forth a writing board having an integrally molded tray.
  • the tray provides a convenient receptacle for pens, erasers and the like.
  • Fig. 1 is a- diagrammatic showing of the method for manufacturing the writing board of the present inven ⁇ tion
  • Fig. 2 is a perspective front view of the writing board manufactured by the steps of Fig. 1;
  • Fig. 3 is a perspective rear view of the writ ⁇ ing board manufactured by the steps of Fig. 1;
  • Fig. 4 is a perspective front view of the writing board of the present invention illustrating the attachment of the writing surface to the writing board frame;
  • Fig. 5 is a perspective front view of another embodiment of the present invention showing the use of an intermediate sheet between the writing surface and the writing board frame;
  • Fig. 6 is a partial section view taken as indicated on line 5-5 of Fig. 4; and Fig. 7 is a partial section view taken as indicated on line 7-7 of Fig. 6.
  • the first step in the process is the integral molding of a writing board frame 12.
  • the frame 12 is molded from an inexpen ⁇ sive, lightweight material such as a styrofoam product ("STYROFOAM" is a Dow Chemical Company trademark for ex- panded cellular polystyrene) .
  • STYROFOAM is a Dow Chemical Company trademark for ex- panded cellular polystyrene
  • the molding of the frame 12 typically involves the injection of expandable beads of polystyrene into a closed mold, the injection of the beads being metered into the mold and heated by low- pressure steam. In the mold the beads of polystyrene expand into closed cells, the walls of which soften and weld together to form a cellular structure shaped by the mold.
  • the object so molded for example the writing board of the present invention, is oversaturated with water deposited therein by the low-pressure steam.
  • the molded material contains a greater percentage of moisture than normal ambient conditions.
  • the molded writing board eventually dries as the moisture evaporates into its surroundings.
  • the drying of the styrofoam product is accompanied by dimen ⁇ sional changes in all three dimensions; in length, in width, and in depth.
  • the frame 12 of the writing board 10 along with other frames 12 so molded are stacked or otherwise positioned in a spaced relation ⁇ ship, as is schematically shown by box 14 of Fig. 1.
  • the spatial relationship between the molded frames 12 is important to permit air to circulate about the frames for drying thereof.
  • the frames 12 are allowed to dry or "age". This permits the dimensional changes occasioned by aging of the frame to proceed until the frame has assumed substantially permanent dimensions as schematically shown by box 16 of Fig. 1. It has been found that aging of the frame 12 should be for at least seven days. If necessary, because of humid ambient conditions or to accelerate aging, the frames can be heated to a temperature of about 120-130°F. Depending upon ambient conditions , the frames 12 may be required to be aged for a period of several weeks before becoming substantially permanent in dimension.
  • the frame 12 for the writing board 10 has attained the substantially permanent shape as exemplified in Figs. 2-5. It should be noted, how ⁇ ever, that the configuration of the writing board 10 illustrated in the drawings is by no means exclusive in that any desired shape of a writing board 10 is con- templated.
  • the frame 12 as it leaves the aging step may be substantially rectangular, having a front shown generally as 18, a rear 20, and an upper tray 22.
  • the upper tray 22 protrudes outwardly of the front 18.
  • This provides a platform 24 for holding, for example, a marking pen 26 and a dry-erase sponge 28 as is shown in Fig. 2.
  • Side- walls 30 on the tray 22 confine the pen 26 and sponge 28 to the platform 24.
  • a planar, rectangular recess 34 Molded within the front 18 so as to leave a narrow border 32 thereabout, is a planar, rectangular recess 34, as best shown in Fig. 4.
  • the planar surface of the recess 34 defines a substrate 36, the purpose of which will hereinafter become evident.
  • a non-porous sheet defining a writing surface 38 is adhered to the substrate 36 as is schematically shown by box 45 of Fig. 1.
  • the sheet 38 as shown in Figs. 2, 4 and 5, is closely received into and mates with the recess 34.
  • the recess 34 is preferably of a depth that the writing surface 38 when adhered therein is coplanar with the border 32 of the frame 12, as best shown in Fig. 5.
  • the non-porous writing surface 38 can be glass, ceramic, porcelain, sheets of fluorinated resins such as Tefzel products (TEFZEL is a DuPont trade- mark for fluorinated resin) Saran film or ultra-high molecular weight polyethylene and melamine; however, from a cost standpoint, the writing surface is preferably a thin sheet of polypropylene.
  • the mater ⁇ ial selected for the writing surface 38 should be adapted to receive and display discrete marks from dry-erase pens and permit the marks to be removed with a cloth, sponge or the like. In other words, the surface 38 should be suitable for dry-erase applications.
  • the adhering of the writing surface 38 to the frame 12 can be accomplished through any number of adhesives consistent with the materials used in the frame 12 and the writing surface 38.
  • a sheet of white polystyrene 40 may be adheringly interposed between the substrate 36 and the writing surface 38 as shown in Figs. 6 and 7.
  • the recess 34 is preferably of a depth to accommodate both the writing surface 38 and the polystyrene 40 so as to maintain the coplanar arrangement of the writing surface 38 and its surrounding frame border 32. Materials in substitute of the polystyrene 40 which add hardness and/or opaqueness to the writing surface 38 could likewise, be used.
  • the lightweight, inexpensive styrofoam product provides a suitable, flat supporting frame to mount and retain the writing surface 38 without bubbles, buckles or wrinkles. This, in turn, aesthetically enhances the writing board 10 and assures the utility thereof.
  • adhesive strips 42 may be attached to the back 20. Attachment to the wall is thereby made quick and easy merely by peeling off the protective layers on the adhesive stripe 42 and pressing the wall board 11 against the wall.
  • a toothed slot 44 may be provided to hang the wall board 11 on a suitable wall bracket.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Drawing Aids And Blackboards (AREA)

Abstract

Tableau à écrire (10), ainsi que son procédé de fabrication, possédant un cadre (12) moulé dans un matériau léger et bon marché dont les dimensions changent au fur et à mesure de son vieillissement. Ce procédé comprend une étape de vieillissement permettant au cadre de conserver des dimensions pratiquement fixes. On fixe ensuite une surface à écrire non poreuse (38) au cadre qui est conçue pour recevoir et afficher une marque faite par une plume du type qui s'efface à sec. Un plateau (22) est moulé intégralement avec le cadre pour contenir des articles comme des plumes du type qui s'effacent à sec et des gommes.
EP83902405A 1982-09-29 1983-07-05 Tableau a ecrire et son procede de fabrication Withdrawn EP0120031A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42701582A 1982-09-29 1982-09-29
US427015 1982-09-29

Publications (1)

Publication Number Publication Date
EP0120031A1 true EP0120031A1 (fr) 1984-10-03

Family

ID=23693133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83902405A Withdrawn EP0120031A1 (fr) 1982-09-29 1983-07-05 Tableau a ecrire et son procede de fabrication

Country Status (2)

Country Link
EP (1) EP0120031A1 (fr)
WO (1) WO1984001328A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1002189B (en) * 1995-03-23 1996-03-15 Aggelos Safarikas Method for the construction of educational boards for schools and for personal use by students.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823047A (en) * 1971-08-10 1974-07-09 Lavorazione Mat Plast Manufacturing laminates of expanded thermoplastic resins
US3922457A (en) * 1972-12-22 1975-11-25 Stratabord Limited Dry wipe writing system and ink therefor
US3930917A (en) * 1974-09-23 1976-01-06 W. R. Grace & Co. Low density laminated foam and process and apparatus for producing same
NL171781C (nl) * 1978-06-09 1983-05-16 Markomark Bv Werkwijze voor het vervaardigen van een paneel, voorzien van een randlijst uit een polyurethanmateriaal aan ten minste een zijrandvlak daarvan.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8401328A1 *

Also Published As

Publication number Publication date
WO1984001328A1 (fr) 1984-04-12

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840830

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BURKHALTER, ROBERT, E.