EP0450907B1 - Méthode de coulage avec déversement de la barbotine - Google Patents

Méthode de coulage avec déversement de la barbotine Download PDF

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Publication number
EP0450907B1
EP0450907B1 EP91302866A EP91302866A EP0450907B1 EP 0450907 B1 EP0450907 B1 EP 0450907B1 EP 91302866 A EP91302866 A EP 91302866A EP 91302866 A EP91302866 A EP 91302866A EP 0450907 B1 EP0450907 B1 EP 0450907B1
Authority
EP
European Patent Office
Prior art keywords
sludge
molding
die
steam
product
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 - Lifetime
Application number
EP91302866A
Other languages
German (de)
English (en)
Other versions
EP0450907A3 (en
EP0450907A2 (fr
Inventor
Kazuo Senda
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.)
Inax Corp
Original Assignee
Inax Corp
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Filing date
Publication date
Application filed by Inax Corp filed Critical Inax Corp
Publication of EP0450907A2 publication Critical patent/EP0450907A2/fr
Publication of EP0450907A3 publication Critical patent/EP0450907A3/en
Application granted granted Critical
Publication of EP0450907B1 publication Critical patent/EP0450907B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/42—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for heating or cooling, e.g. steam jackets, by means of treating agents acting directly on the moulding material

Definitions

  • the present invention relates to a sludge-discharging cast molding method, and in particular to a sludge-discharging cast molding method capable of substantially reducing the molding time.
  • a sludge-discharging cast molding method comprises charging an absorbing molding die, for example made of gypsum, with a sludge (slurried granular raw clay), allowing the water contained in the sludge to penetrate into the molding die thereby depositing the remaining granular raw clay onto the inner surface of the molding die, thereafter discharging any excess sludge, opening the molding die after a predetermined period of time has elapsed and removing the deposited product.
  • This molding method is employed generally as a method of manufacturing various kinds of sanitary potteries and the like.
  • UK Patent GB-A-1337492 describes a casting method in which warm air is circulated through the casting to dry it.
  • an object of the present invention is to provide a sludge-discharging cast molding method capable of substantially reducing the standing time following discharge of the excess sludge and, accordingly, capable of reducing the molding time thereby increasing the cycling rate of the molding operation using the molding die and improving production efficiency.
  • the invention provides a sludge-discharging cast molding method comprising charging a water absorbing molding die with sludge, permitting sludge to deposit therein to form a deposition product and discharging excess undeposited sludge from said die, characterised in that steam is introduced into said molding die to heat the deposition product. After steam is introduced into the die and the deposition product is thereby heated the die is preferably flushed with air or another substantially dry gas. Thereafter the die may be released (opened) and the molding product taken out.
  • the molding die used in the present invention may be gypsum, but a die made of a porous synthetic resin having water absorbing property may also be used.
  • the molding die can be used for various kinds of sanitary pottery such as western toilets, Japanese toilets and washing basins, as well as for various other kinds of pottery.
  • the sludge charged into the molding die may be of the type conventionally used.
  • sludge is injected and then deposited for about 10 to 80 min., preferably, 15 to 60 min and then discharged. After discharging the sludge, steam is introduced into a molding space of the molding die (the space previously occupied by the excess sludge) to heat the deposition product.
  • this state is maintained for about 10 to 30 min., thereby causing the water content in the deposition product to be absorbed into the molding die. After maintaining this state till the deposition product attains a predetermined strength, the mold is released to take out the molding product.
  • the molding product may then be finished into a pottery product using the steps of drying, glazing and baking.
  • a western toilet was molded by the sludge-discharging cast molding method of the invention using a gypsum die 1 as shown in Fig. 1.
  • sludge concentration of starting clay at 1250 g/l
  • sludge concentration of starting clay at 1250 g/l
  • steam at a pressure of 0.2 kg/cm2 was introduced into the gypsum die 1 and this state was maintained for 50 sec in order to heat the deposition product.
  • air at ambient temperature was introduced and, after maintaining this state for 20 min. the molding die was released.
  • a molding product, in the form of a western toilet, having a required molding strength was obtained.
  • a molding product was manufactured analogously to Example 1 except that no steam or air was introduced into the molding die after discharging the excess sludge. However, it was necessary to allow the deposition product to stand for about 40 min after discharging the excess sludge in order to obtain a molding product having a molding strength capable of allowing the mold to be released.
  • Example 1 It is apparent from a comparison of Example 1 and Comparative Example 1, that the standing time (for water absorption) after discharging the excess sludge can be reduced to one half according to the method of the present invention.
  • a hand wash basin was molded by a sludge-discharging cast molding method using the gypsum die 2 as shown in Fig. 2.
  • Fig. 2 illustrates an introduction hole 3 for air and steam, sludge discharging holes 4, a casting hole 5 and temperature measuring holes A and B (temperature sensor insertion holes).
  • the clay starting content of the sludge used was 1250 g/l and the temperature was 34°C.
  • the sludge was introduced into the gypsum die 2, left to deposit for the time shown in Table 1, and then discharged. Subsequently, steam at a pressure of 0.2 kg/cm2 was introduced for 12 min in Example 2 and for 6 min in Example 3. Then the steam was discharged and, air at ambient temperature was introduced and the die was left in this state for 35 min in Example 2 and 40 min in Example 3. Thereafter the molding products were released from the molds.
  • Comparative Example 2 air at ambient temperature was introduced into the gypsum die 2 following discharge of the excess sludge and the die was maintained in this state for 35 min. Thereafter the molding product was released from the mold.
  • Table 2 also shows the weight of the deposition product (molding product) and the water content therein.
  • Example 3 the change of temperature with time in the gypsum die 2 was measured following the introduction of the steam. The results are shown in Fig. 5. It can be seen that the die temperature is elevated by the introduction of the steam.
  • Example 3 molding was conducted whilst varying the steam introduction time from 0 to 12 min and the hardness and water content of the resultant molding products were measured. The results are shown in Figs. 6 and 7.
  • the standing time after discharging the excess sludge can be substantially reduced by the method according to the present invention. Therefore, it is possible to shorten the molding time and increase the number of operation cycles of the molding die within a given time to improve the production efficiency.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Treatment Of Sludge (AREA)
  • Buffer Packaging (AREA)

Claims (8)

  1. Méthode de moulage par coulée avec évacuation de la barbotine, qui consiste à remplir un moule absorbant l'eau avec la barbotine, à permettre à la barbotine de se déposer dans le moule pour former un produit déposé, et à évacuer la barbotine non déposée en excès dudit moule, caractérisée en ce qu'on introduit de la vapeur d'eau dans ledit moule pour chauffer le produit déposé.
  2. Procédé suivant la revendication 1, dans lequel, après l'introduction de vapeur, le moule est balayé avec de l'air.
  3. Méthode suivant la revendication 1 ou 2, dans laquelle le moule est ensuite ouvert et le produit moulé est retiré du moule.
  4. Méthode suivant l'une quelconque des revendications 1 à 3, dans laquelle ledit moule est un moule en plâtre.
  5. Méthode suivant l'une quelconque des revendications 1 à 4, dans laquelle le produit déposé est maintenu en contact avec la vapeur introduite, pendant une durée prédéterminée, après quoi on introduit de l'air à température ambiante pour chasser la vapeur.
  6. Méthode suivant la revendication 5, dans laquelle ladite durée prédéterminée est comprise entre 30 secondes et 3 minutes.
  7. Méthode suivant l'une ou l'autre des revendications 5 et 6, dans laquelle le moule est ouvert 10 à 30 minutes après ladite introduction d'air.
  8. Méthode suivant l'une quelconque des revendications précédentes, dans laquelle ledit moule est chargé avec de la barbotine et ladite barbotine en excès est évacuée 10 à 80 minutes plus tard.
EP91302866A 1990-04-03 1991-04-02 Méthode de coulage avec déversement de la barbotine Expired - Lifetime EP0450907B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP88887/90 1990-04-03
JP2088887A JPH03286805A (ja) 1990-04-03 1990-04-03 排泥鋳込み成形法

Publications (3)

Publication Number Publication Date
EP0450907A2 EP0450907A2 (fr) 1991-10-09
EP0450907A3 EP0450907A3 (en) 1991-11-27
EP0450907B1 true EP0450907B1 (fr) 1993-07-21

Family

ID=13955489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91302866A Expired - Lifetime EP0450907B1 (fr) 1990-04-03 1991-04-02 Méthode de coulage avec déversement de la barbotine

Country Status (5)

Country Link
EP (1) EP0450907B1 (fr)
JP (1) JPH03286805A (fr)
KR (1) KR910018142A (fr)
DE (1) DE69100178T2 (fr)
ES (1) ES2042339T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104890104A (zh) * 2015-06-24 2015-09-09 唐山贺祥机电股份有限公司 座便器提升成型机的自动气动锁紧装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053250A (fr) * 1900-01-01
US2517001A (en) * 1947-10-31 1950-08-01 Paraffine Co Inc Molding apparatus
US3034192A (en) * 1957-07-11 1962-05-15 Ind Dev Co Method for producing molded articles of concrete and the like material
GB1337492A (en) * 1971-03-05 1973-11-14 Hayek Partners Ltd Ag Casting of sanitary ware
FR2583675A1 (fr) * 1985-06-25 1986-12-26 Coumont Serge Procede de fabrication de coquilles d'escargots en ceramique, gres, porcelaine
JP2664779B2 (ja) * 1989-08-23 1997-10-22 株式会社東芝 ファインセラミックスの鋳込み成形方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104890104A (zh) * 2015-06-24 2015-09-09 唐山贺祥机电股份有限公司 座便器提升成型机的自动气动锁紧装置
CN104890104B (zh) * 2015-06-24 2017-03-29 唐山贺祥机电股份有限公司 座便器提升成型机的自动气动锁紧装置

Also Published As

Publication number Publication date
ES2042339T3 (es) 1993-12-01
EP0450907A3 (en) 1991-11-27
DE69100178T2 (de) 1994-03-17
JPH03286805A (ja) 1991-12-17
DE69100178D1 (de) 1993-08-26
KR910018142A (ko) 1991-11-30
EP0450907A2 (fr) 1991-10-09

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