GB2216842A - Mold steel for foamed plastic molding - Google Patents

Mold steel for foamed plastic molding Download PDF

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Publication number
GB2216842A
GB2216842A GB8906931A GB8906931A GB2216842A GB 2216842 A GB2216842 A GB 2216842A GB 8906931 A GB8906931 A GB 8906931A GB 8906931 A GB8906931 A GB 8906931A GB 2216842 A GB2216842 A GB 2216842A
Authority
GB
United Kingdom
Prior art keywords
mold steel
molding
pad member
foamed plastic
lower mold
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Withdrawn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
GB8906931A
Other versions
GB8906931D0 (en
Inventor
Hisayoshi Mizuno
Ichiro Matsuura
Kiichiro Ishimaru
Fumio Saotome
Yoichi Omata
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.)
Ikeda Corp
Original Assignee
Ikeda Bussan 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 Ikeda Bussan Co Ltd filed Critical Ikeda Bussan Co Ltd
Publication of GB8906931D0 publication Critical patent/GB8906931D0/en
Publication of GB2216842A publication Critical patent/GB2216842A/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34Auxiliary operations
    • B29C44/58Moulds
    • B29C44/585Moulds with adjustable size of the mould cavity
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/30Mounting, exchanging or centering
    • B29C33/301Modular mould systems [MMS], i.e. moulds built up by stacking mould elements, e.g. plates, blocks, rods
    • B29C33/302Assembling a large number of mould elements to constitute one cavity

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

A mold steel (10) for foamed plastic molding to be utilized in foamed plastic pad member formation and the simultaneous combining of the skin cover member and the pad member capable of coping with a partial change in the shape of the pad member in a simple and inexpensive manner. The mold steel includes a lower mold steel (11) with a molding surface made up by top surfaces of a plurality of blocks (15). <IMAGE>

Description

MOLD STEEL FOR FOAMED PLASTIC MOLDING BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a mold steel for foamed plastic molding suitable for molding foamed plastic article such as to be used for car seat cushions and seat backs in conjunction with skin covers.
Description of the Background Art The car seat cushions and car seat backs usually comprises a pad member made of such material as a soft polyurethane, and a skin cover member to be wrapped around the pad member. One of the popular and efficient method of manufacturing such a car seat cushion is to use a pair of mold steels. An example of such mold steel is shown in Fig. 1 where there is provided a pair of mold steels comprising a lower mold steel 1 and an upper mold steel 2.
A sack-shaped skin cover member 3 prepared by sewing process is place on top of a inner surface of the lower mold steel 1 over which liquid soft polyurethane is poured in, and with the upper mold steel 2 placed on top of the lower mold steel 1 the liquid soft polyurethane is foamed and stiffened to become the pad member 4 and at the same time combining of the skin cover member 3 and the pad member 4 is achieved.
However, in a situation such as that in which only side support portions of the car seat cushion are to be slightly modified, a whole lower mold steel 1 has to be replaced by a new one with the desired shape despite of the fact that only a part of the lower mold steel 1 is actually altered, which contributes to an increase in manufacturing cost.
SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a mold steel for foamed plastic molding to be utilized in foamed plastic pad member formation and the simultaneous combining of the skin cover member and the pad member capable of coping with a partial change in the shape of the pad member in a simple and inexpensive manner.
This object of the present invention is achieved by providing a mold steel for foamed plastic molding to be utilized in foamed plastic pad member formation and the simultaneous combining of the skin cover member and the pad member, comprising: a lower mold steel including: an outer frame with a cavity portion; and a plurality of blocks to be installed into the cavity portion whose top surfaces form a molding surface of the lower mold steel over which the skin cover member and the pad member are to be placed; and an upper mold steel which open and close over the outer frame of the lower mold steel with the skin cover member and the pad member inside the cavity portion.
Other features and the advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross sectional view of a conventional mold steel for foamed plastic molding.
Fig. 2 is a perspective view of one embodiment of a mold steel for foamed plastic molding according to the present invention.
Fig. 3(A) and (B) are cross sectional views of the mold steel of Fig. 2 for explaining a situation where this mold steel of the present invention is advantageous.
Fig. 4 is a cross sectional view of the mold steel of Fig. 2 for explaining a step of molding process using this mold steel of the present invention.
Fig. 5 is a cross sectional view of the mold steel of Fig. 2 for explaining another step of molding process using this mold steel of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to Fig. 2, there is shown one embodiment of the mold steel for foamed plastic molding according to the present invention.
This mold steel 10 for foamed plastic molding comprises a lower mold steel 11 and an upper mold steel 12.
The lower mold steel 11 further comprises a case-like outer frame 14 having a cavity portion 13, and a plurality of blocks 15 to be installed in the cavity portion 13. The upper mold case 12 is pivotally connected to the outer frame 14 of the lower mold steel 11 by hinges 16a and 16b so as to facilitate the opening and closing of the upper mold steel 12 against the lower mold steel 11.
In this embodiment of Fig. 2, the cavity portion 13 of the lower mold steel 11 is divided into a plurality of regions defined in terms of approximately 100 mm wide intervals in both longitudinal and transversal directions, such that each of the plurality of blocks 15 can be installed into each of the plurality of regions in the cavity portion 13.
Each of the plurality of blocks 15 has a top surface in such a shape that top surfaces of the blocks to be adjacently installed such as 151s and 1512 or 153o and 1541 in Fig. 2 can form a piece-wise smooth and continuous molding surface of the lower mold steel 11.
Now, in a situation such as that shown in Figs. 3(A) and 3(B) in which only side support portions of the car seat cushion are to be slightly modified so that the lower mold steel have to be changed from the lower mold steel 11 with the plurality of blocks 15 shown in Fig. 3(A) to the new lower mold steel 11' with the plurality of new blocks 15' shown in Fig. 3(B), it is only necessary to replace the blocks 15tut, 1521. 1571, and 158t by the new blocks 15'tut, 15'21 , 15'71 , and 17'sir in this embodiment because of the configuration of the lower mold steel made by the plurality of blocks 15, unlike the conventional mold steel for which a whole lower mold steel had to be replaced by a new one.
Consequently, cost for manufacturing the mold steel can be greatly reduced, and also by preparing number of blocks with various different shapes, the efficiency in manufacturing the car seat cushion can be improved.
Next, the molding process for manufacturing the car seat cushion with this mold steel 10 will be explained with references to Figs. 4 and 5.
First, as showun in Fig. 4, a skin cover 17 is placed on top of the molding surface of the lower mold steel 11 formed by the top surfaces of the plurality of blocks 15.
This skin cover 17 comprises a cover 18 made of such material as vinylchloride with a back portion (wadding) 19 made of such material as slab urethane incorporated, and is prepared in a sack-like shape of the seat cushion beforehand by a sewing process.
Then, the liquid polyurethane 20 is poured over the skin cover 17 from a nozzle 21.
Next, as shown in Fig. 5, the upper mold steel 12 is closed over the lower mold steel 11, and the the liquid polyurethane is foamed and stiffened to become the pad 22 and at the same time combining of the skin cover 17 and the pad 22 is achieved.
After the formation of the pad 22 is completed, the upper mold steel 12 is opened, and the seat cushion made of the skin cover 17 and the pad 22 combined is taken out from the lower mold steel 11.
The seat cushion manufactured in this manner has precisely the same form as those manufactured with a conventional mold steel. The divided configuration of the the plurality of blocks 15 does not affect the output seat cushion because of the presence of the skin cover 17.
As explained, according to the present invention it is possible to provide a mold steel for foamed plastic molding to be utilized in foamed plastic pad member formation and the simultaneous combining of the skin cover member and the pad member capable of coping with a partial change in the shape of the pad member in a simple and inexpensive manner.
It is to be noted that the manner of dividing the plurality of blocks 15 in the above embodiment can be modified in any desirable manner. For example, dividing the plurality of blocks 15 into just two side support portions and one back portion may also be sufficiently effective.
Also it should be noted that the mold member is not necessarily made of steel, but may be made of material such as wood, ceramics and the like.
Besides this, many modifications and variations of the above embodiment may be made without departing from the novel and advantageous feature of the present invention.
Accordingly, all such modifications and variations are intended to be included within the scope of the appended claims.

Claims (10)

WHAT IS CLAIMED IS:
1. A mold steel for foamed plastic molding to be utilized in foamed plastic pad member formation and the simultaneous combining of the skin cover member and the pad member, comprising: a lower mold steel including: an outer frame with a cavity portion; and a plurality of blocks to be installed into the cavity portion whose top surfaces form a molding surface of the lower mold steel over which the skin cover member and the pad member are to be placed; and an upper mold steel which open and close over the outer frame of the lower mold steel with the skin cover member and the pad member inside the cavity portion.
2. The mold steel of claim 1, wherein the molding surface of the lower mold steel is piece-wise smooth and continuous.
3. The mold steel of claim 1, wherein the cavity portion is divided up into a plurality of regions for receiving the plurality of blocks.
4. The mold steel of claim 1, wherein at least one block among the plurality of blocks is provided for each part of the skin cover member and the pad member combination with distinguishable shape.
5. The mold steel of claim 1, wherein the mold steel is used for forming car seat cushions t car seat backs.
6. A mold comprising a frame defining a cavity and at least one molding block, receivable within the cavity, the at least one molding block having at least one surface which, in use, acts as a molding surface.
7. A method of molding an article using a mold according to any one of Claims 1 to 6.
8. A mold substantially as hereinbefore described with reference to, and as shown in, Figures 2 to 5 of the accompanying drawings.
9. A method of molding an article substantially as hereinbefore described with reference to Figures 4 and 5 of the accompanying drawings.
10. Any novel feature or combination of features disclosed herein.
GB8906931A 1988-03-26 1989-03-28 Mold steel for foamed plastic molding Withdrawn GB2216842A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3995588U JPH0538899Y2 (en) 1988-03-26 1988-03-26

Publications (2)

Publication Number Publication Date
GB8906931D0 GB8906931D0 (en) 1989-05-10
GB2216842A true GB2216842A (en) 1989-10-18

Family

ID=12567378

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8906931A Withdrawn GB2216842A (en) 1988-03-26 1989-03-28 Mold steel for foamed plastic molding

Country Status (2)

Country Link
JP (1) JPH0538899Y2 (en)
GB (1) GB2216842A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2240302A (en) * 1989-12-29 1991-07-31 Kenneth Macmillan Moulding articles of different length or diameter in a single mould
DE10327630B3 (en) * 2003-06-20 2004-12-09 Krauss-Maffei Kunststofftechnik Gmbh Rotary molding unit for plastic skins, includes supply and return systems circulating thermal medium in intervening flow space
WO2009055025A1 (en) * 2007-10-25 2009-04-30 Sealed Air Corporation (Us) Mold, mold image and method for making a molded article
CN105082442A (en) * 2015-07-15 2015-11-25 浙江三箭工贸有限公司 Mould compression device for plaques
ES2558793A1 (en) * 2015-10-14 2016-02-08 Seat, S.A. Mold for obtaining pieces of foam for a vehicle seat (Machine-translation by Google Translate, not legally binding)
WO2019238621A1 (en) * 2018-06-13 2019-12-19 Adient Engineering and IP GmbH Device and method for producing seat shells for vehicle seats

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2274060A (en) * 1938-10-31 1942-02-24 United Shoe Machinery Corp Mold and mold making method
GB611432A (en) * 1946-04-26 1948-10-29 James Mitchell Anderson A new or improved means for moulding ophthalmic contact lenses from plastics
GB650692A (en) * 1944-11-28 1951-02-28 Teksun Inc Injection mold for use in molding opthalmic lenses and other articles
DE1479272A1 (en) * 1963-12-05 1969-05-29 Peter Hedgewick Reflector
GB1279297A (en) * 1969-06-24 1972-06-28 Howmet Corp Ceramic gang mold
FR2243798A1 (en) * 1973-09-19 1975-04-11 Nii R I Latexnykh Izdely
WO1986002877A1 (en) * 1984-11-05 1986-05-22 Maekinen Olavi Adjustable mould

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2274060A (en) * 1938-10-31 1942-02-24 United Shoe Machinery Corp Mold and mold making method
GB650692A (en) * 1944-11-28 1951-02-28 Teksun Inc Injection mold for use in molding opthalmic lenses and other articles
GB611432A (en) * 1946-04-26 1948-10-29 James Mitchell Anderson A new or improved means for moulding ophthalmic contact lenses from plastics
DE1479272A1 (en) * 1963-12-05 1969-05-29 Peter Hedgewick Reflector
GB1279297A (en) * 1969-06-24 1972-06-28 Howmet Corp Ceramic gang mold
FR2243798A1 (en) * 1973-09-19 1975-04-11 Nii R I Latexnykh Izdely
WO1986002877A1 (en) * 1984-11-05 1986-05-22 Maekinen Olavi Adjustable mould

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2240302A (en) * 1989-12-29 1991-07-31 Kenneth Macmillan Moulding articles of different length or diameter in a single mould
GB2240302B (en) * 1989-12-29 1993-09-15 Kenneth Macmillan Apparatus for and method of molding articles
DE10327630B3 (en) * 2003-06-20 2004-12-09 Krauss-Maffei Kunststofftechnik Gmbh Rotary molding unit for plastic skins, includes supply and return systems circulating thermal medium in intervening flow space
WO2009055025A1 (en) * 2007-10-25 2009-04-30 Sealed Air Corporation (Us) Mold, mold image and method for making a molded article
CN105082442A (en) * 2015-07-15 2015-11-25 浙江三箭工贸有限公司 Mould compression device for plaques
CN105082442B (en) * 2015-07-15 2017-08-29 浙江三箭工贸有限公司 Plaque compression mold device
ES2558793A1 (en) * 2015-10-14 2016-02-08 Seat, S.A. Mold for obtaining pieces of foam for a vehicle seat (Machine-translation by Google Translate, not legally binding)
WO2019238621A1 (en) * 2018-06-13 2019-12-19 Adient Engineering and IP GmbH Device and method for producing seat shells for vehicle seats
CN112272604A (en) * 2018-06-13 2021-01-26 安道拓工程技术知识产权有限公司 Device and method for producing a seat shell of a vehicle seat

Also Published As

Publication number Publication date
JPH01148313U (en) 1989-10-13
GB8906931D0 (en) 1989-05-10
JPH0538899Y2 (en) 1993-10-01

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)