WO1995033613A1 - Process for making the stamps known as rubber stamps - Google Patents

Process for making the stamps known as rubber stamps Download PDF

Info

Publication number
WO1995033613A1
WO1995033613A1 PCT/IT1994/000171 IT9400171W WO9533613A1 WO 1995033613 A1 WO1995033613 A1 WO 1995033613A1 IT 9400171 W IT9400171 W IT 9400171W WO 9533613 A1 WO9533613 A1 WO 9533613A1
Authority
WO
WIPO (PCT)
Prior art keywords
pan
channel
plastic material
sheet
stamps
Prior art date
Application number
PCT/IT1994/000171
Other languages
French (fr)
Inventor
Riccardo Galimberti
Original Assignee
M.G.P. S.R.L.
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 M.G.P. S.R.L. filed Critical M.G.P. S.R.L.
Publication of WO1995033613A1 publication Critical patent/WO1995033613A1/en

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/0015—Production of aperture devices, microporous systems or stamps
    • 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
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C39/026—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making 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
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/22—Component parts, details or accessories; Auxiliary operations
    • B29C39/26—Moulds or cores
    • B29C39/265—Moulds or cores comprising two large plates positioned at a small distance from each other, e.g. for making panels
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • 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
    • 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
    • B29K2021/00—Use of unspecified rubbers 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
    • B29L2031/767—Printing equipment or accessories therefor

Definitions

  • Fig. I The pan subject of the invention while plastic material is being poured in, plan view.
  • Fig. 2 Cross section of the view in Fig. 1.
  • Fig. 3 The pan filled with plastic material placed be- tween two sheets of plate glass, to be put into the exposer.
  • the rectangular pan 10, made by a thermoforming process from a sheet of transparent PVC has a flat bottom 17 and a surrounding edge 11 with a rib shaped as a reversed 'V' . All round the pan is a channel 12 with an outer rim 13.
  • the sides 15 of the pan and those 16 of the channel are inclined outwards.
  • Said pan is placed upon the plate glass 20 and is filled with liquid plastic material 30.
  • the surplus liquid 31 seeps into the channel 12 through the grooves 14 made in the edge 11.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Process for the preparation of stamps, known as rubber stamps, by pouring liquid photo-hardening, or photopolymerizable to UV rays, plastic material (30) in a pan (10) made in a single piece by thermoforming, of a disposable type, said pan having a thin transparent bottom (17) of PVC, its depth being constant and corresponding to the thickness of the stamp to be made, said pan being surrounded by a channel (12) that communicates with the pan (10) through grooves (14) cut in the intermediate edge (11) and through which excess material can seep out.

Description

Process for making the stamps known as rubber stamps
Rubber stamps fitted with handles are objects of every¬ day use and, when inked, serve to impress symbols and words on paper or on other surfaces, using fast-drying inks .
The stamps themselves are made by means of a matrix in which, by a process employing heat, a casting is made of rubber or similar materials. The matrix is prepared with zinc dies or with type set in lead. This process however requires skilled opera¬ tors, is slow and consequently efficiency is low. Problems also arise over making rubber stamps which combine a pictorial image and wording. Rubber stamps can now be made by a more recent process of photo- ransposition. By this means a positive or negative image is photographically reproduced on a trans¬ parent base by contact on sheets of photopolymerizable plastic material or on sheets of photo-hardening col¬ loidal material, or by some similar method. Exposure to light through the negative or positive film causes the parts reached by the light to become insoluble and hard.
When the sheet is put in the developing bath it follows that the non-insolubi1ized parts dissolve leaving a raised formation that can be used for a stamp.
The advantage which this process offers is that of being able to make stamps of different thicknesses and with a pictorial image and words associated as desired. Further, the photographic means employed make possible ex- cellent reproductions of any subject with a pictorial image or words .
The process is however laborious and complicated; it also needs a number of different items and, to get the best re¬ sults, these must be used in the correct order. The items at present needed are: liquid plastic material pho opolymerizable or photo- hardening , a sheet of transparent plastic for the base, figures and wording negative or positive on film, a sheet of transparent plastic for a cover, a set of adhesive strips, a can of spray adhesive, a can of spray detergent. Formation of the stamp takes place inside the exposer and the layer of plastic material, protected on each side by a sheet of plate glass, receives a double exposure to ul¬ traviolet rays .
After cleaning with the detergent one of the sheets of plate glass is sprayed with the adhesive and the undersheet of plastic material is laid on it.
A sort of frame is created on this sheet using adhesive strips to form a polygon, generally a square or rectangle, of the desired dimensions.
This frame, together with the undersheet, forms a kind of 'pan' of constant depth.
The liquid plastic material is then poured into this pan. There are obviously some drawbacks connected with a pro¬ cess such as this .
Optimum results can in fact only be obtained if the plate glass sheets are perfectly clean, if the undersheet is laid absolutely flat with no creases or roughness, if the right quantity of plastic material is poured in so that there is neither an overflow nor too little. If the material were to flow out it would in fact create problems since it is highly viscous and difficult to clean off the plate glass. The time needed is not less than 4 to 5 minutes.
Purpose of the invention here proposed is to simplify and facilitate formation of the stamp of plastic material as will be explained below. Subject of the invention is a process for preparing the so-called rubber stamps using a sheet of pho o-hardening or pho opolymerizable liquid plastic material. This material is poured into a shallow pan made in one piece,with a bottom of thin transparent plastic, of con¬ stant depth corresponding to the thickness of the sheet to be obtained for making the stamp.
Shape and dimensions of the pan are also the same as those of said sheet to be formed.
Preferably the pan is made by a thermoforming process and the plastic material is preferably PVC . The pan is surrounded by a continuous channel in one piece with the pan itself. Total thickness is constant both of the pan and the channel. In one preferred type the pan communicates with the chan¬ nel through grooves across the edge separating the pan from the channel.
The bottom of said grooves is at a level, in relation to the bottom of the pan, corresponding to the desired thick¬ ness of the sheet of plastic material.
On the outer wall of the channel there is a rim parallel to the bottom of the pan. Capacity of the channel is established to allow for an overflow of excess plastic material from the pan during normal working.
The walls of the pan and channel are inclined outwards. Shape of the cross section of the part that separates the pan from the channel is that of an overturned 'V' . Dimensions for a preferred execution are roughly as follows: width and length of the pan: mm 75 x 100 width of the channel: mm 10 depth of the pan: mm 3 projection of the rim round the channel: mm 4 Having poured the liquid plastic material into the pan, a transparent sheet of plastic material is placed on the layer so formed, the photographic film is then laid on said transparent sheet and the whole, placed between two sheets of plate glass, is put inside a UV ray exposer. The above invention offers evident advantages.
Formation of the stamp is facilitated and made simpler. The pan prepared ready, in place of one to be set up each time, not only shortens the process but gives far better results. The whole operation takes much less time and can be car¬ ried out by personnel without any special experience. Great economy of material as much less is needed. The advantages of the invention may be summed up as en¬ suring a better and cheaper product.
Characteristics and purposes of the invention will be made still clearer by the following example of its exe- cution illustrated by diagrammatically drawn figures. Fig. I The pan subject of the invention while plastic material is being poured in, plan view. Fig. 2 Cross section of the view in Fig. 1. Fig. 3 The pan filled with plastic material placed be- tween two sheets of plate glass, to be put into the exposer. The rectangular pan 10, made by a thermoforming process from a sheet of transparent PVC , has a flat bottom 17 and a surrounding edge 11 with a rib shaped as a reversed 'V' . All round the pan is a channel 12 with an outer rim 13. The sides 15 of the pan and those 16 of the channel are inclined outwards.
Said pan is placed upon the plate glass 20 and is filled with liquid plastic material 30. The surplus liquid 31 seeps into the channel 12 through the grooves 14 made in the edge 11.
The whole is covered with a transparent sheet 25 and over this sheet is laid the photographic film 25 of the de¬ sired figure and words. On this is placed the second sheet of plate glass 21 held in place by a clip.
The body so obtained is inserted in an ultraviolet ray ex¬ poser wherein will be produced the raised formation of the image . The resulting sheet 32 is then developed, dried and used for composition of the stamp.

Claims

C l a i ms
1. Process for making the stamps known as rubber stamps using a layer of liquid pho o-hardening or photopolymeri- zable plastic material (30), characterized in that the liquid plastic material (30) is poured into a pan ( 10) made in one piece with a flat bottom ( 17) of thin transparent plastic material whose constant depth corresponds to the thickness of the sheet (32) to be obtained for the stamp.
2. Process as in claim 1, characterized in that the shape and dimensions of the pan ( 10) correspond to those of the stamp-forming sheet (32) • to be obtained.
3. Process as in claim 1, characterized in that the pan ( 10) is made by thermoforming .
4. Process as in claim 1, characterized in that the plastic material (30) is PVC.
5. Process as in claim 1, characterized in that the material for the pan ( 10) is of the disposal type to be thrown away after, use.
6. Process as in claim 5, characterized in that the pan ( 10) is surrounded by a chan¬ nel ( 12) .
7. Process as in claim 6, characterized in that the channel ( 12) is continuous.
8. Process as in claim 6, characterized in that the channel ( 12) is in one piece with the pan ( 10) .
9. Process as in claim 6, characterized in that the total thickness of the pan ( 10) and of the channel ( 12) is constant.
10. Process as in claim 6, characterized in that the pan ( 10) communicates with the channel ( 12) through grooves ( 14) cut in the edge ( 11) that separates the pan ( 10) from the channel ( 12) the bottom of said grooves ( 14) being at a level, in relation to the bottom ( 17) of the pan ( 10), corresp¬ onding to the thickness that is required for the sheet (32) of plastic material to be obtained.
11. Process as in claim 6, characterized in that the wall ( 16) of the channel ( 12) has an outer rim ( 13) parallel to the bottom ( 17) of the pan .
12. Process as in claim 6, characterized in that the capacity of the channel ( 12) is established so that, during production, any surplus(31) plastic material (30) can seep out of the pan ( 10) into the channel .
13. Process as in claim 6, characterized in that the walls ( 15) of the pan and ( 16) of the channel ( 12) are inclined outwards.
14. Process as in claim 6, charac erized in that the cross section of the edge ( 11) that separates the pan ( 10) from the channel ( 12) is shaped like an overturned 'V' .
15. Process as in claim 6, characterized in that in one preferred execution the di¬ mensions of the pan ( 10) are as follows: width and length of the pan ( 10): mm 75 x 100, width of the channel ( 12): mm 10, depth of the pan ( 10): mm 3, projection of the rim ( 13) of the channel ( 12): mm 4.
16. Process as in claims 1 to 15, characterized in that having poured the plastic material(30) into the pan ( 10), on the layer (32) so formed a sheet (25) of transparent plastic material is laid, and on said sheet (25) a photographic film (26), the whole then being placed between two sheets of plate glass (20,21) and put inside an ultraviolet ray exposer.
17. Pan ( 10) for the preparation of stamps from a layer (32) of photo-hardening or photopolymerizable liquid pla- stric material (30) characterized in that it is made in a single piece of thin transparent plastic material with a flat bottom ( 17), depth being constant and corresponding to the thickness of the sheet (32) from which the stamp will be made.
18. Pan( 10) as in claim 17, characterized in that it possesses all or some of the cha- racteristics indicated in claims 1 to 17.
PCT/IT1994/000171 1994-06-02 1994-10-14 Process for making the stamps known as rubber stamps WO1995033613A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT94MI001144A ITMI941144A1 (en) 1994-06-02 1994-06-02 PROCEDURE FOR THE FORMATION OF STAMPS
ITMI94A001144 1994-06-02

Publications (1)

Publication Number Publication Date
WO1995033613A1 true WO1995033613A1 (en) 1995-12-14

Family

ID=11369037

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1994/000171 WO1995033613A1 (en) 1994-06-02 1994-10-14 Process for making the stamps known as rubber stamps

Country Status (2)

Country Link
IT (1) ITMI941144A1 (en)
WO (1) WO1995033613A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003014832A1 (en) * 2001-08-10 2003-02-20 Paul Mayo Holt Methods and apparatus for use in photopolymer plate manufacture
US6737219B2 (en) 2001-08-10 2004-05-18 Paul Mayo Holt Photopolymer sachet
EP2124103A3 (en) * 2008-05-20 2011-06-01 Huang Hilson Manufacturing method of printing plate using free-seal, free-quantity liquid photopolymer sachet and apparatus using the same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1570106A (en) * 1967-11-28 1969-06-06
US3837887A (en) * 1969-06-16 1974-09-24 Asahi Chemical Ind Process for the preparation of printing plate of photosensitive resin
JPS61137744A (en) * 1984-12-11 1986-06-25 Asahi Chem Ind Co Ltd Formation of matrix for forming relief
JPS6262716A (en) * 1985-09-12 1987-03-19 Hitachi Chem Co Ltd Manufacture of lens
DE3625822A1 (en) * 1986-07-30 1988-03-03 Irbit Research & Consulting Ag Negative casting mould formed by copying a positive mould
JPH04235083A (en) * 1991-01-10 1992-08-24 Toray Ind Inc Photosensitive resin original plate for rubber stamp
US5269977A (en) * 1990-01-12 1993-12-14 Nissen Kagakukogyo K.K. Method of manufacturing a foam transparent organic glass plate

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1570106A (en) * 1967-11-28 1969-06-06
US3837887A (en) * 1969-06-16 1974-09-24 Asahi Chemical Ind Process for the preparation of printing plate of photosensitive resin
JPS61137744A (en) * 1984-12-11 1986-06-25 Asahi Chem Ind Co Ltd Formation of matrix for forming relief
JPS6262716A (en) * 1985-09-12 1987-03-19 Hitachi Chem Co Ltd Manufacture of lens
DE3625822A1 (en) * 1986-07-30 1988-03-03 Irbit Research & Consulting Ag Negative casting mould formed by copying a positive mould
US5269977A (en) * 1990-01-12 1993-12-14 Nissen Kagakukogyo K.K. Method of manufacturing a foam transparent organic glass plate
JPH04235083A (en) * 1991-01-10 1992-08-24 Toray Ind Inc Photosensitive resin original plate for rubber stamp

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 333 (M - 534) 12 November 1986 (1986-11-12) *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 255 (M - 617) 19 August 1987 (1987-08-19) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 2 (M - 1348) 6 January 1993 (1993-01-06) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003014832A1 (en) * 2001-08-10 2003-02-20 Paul Mayo Holt Methods and apparatus for use in photopolymer plate manufacture
US6737219B2 (en) 2001-08-10 2004-05-18 Paul Mayo Holt Photopolymer sachet
EP2124103A3 (en) * 2008-05-20 2011-06-01 Huang Hilson Manufacturing method of printing plate using free-seal, free-quantity liquid photopolymer sachet and apparatus using the same

Also Published As

Publication number Publication date
ITMI941144A1 (en) 1995-12-02
ITMI941144A0 (en) 1994-06-02

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