Mold stored in the Osaka Celluloid Hall
Isao Sato, Celluloid House Yokohama
1. Introduction
This paper reports the outline of the mold (and related tools) stored in the Osaka Celluloid Hall.
2. As shown in Table 1 (P4), there were 22 molds that were reviewed. An overview is given in Table 2.
Table 2: Type and number
Product name
Mold forFig. 1 Mold for compression

Fig. 2 ZAS insert

Number Examples
9Fig. 1

Cavity insert

1Fig. 2

Pattern

8Fig. 3

ZAS cast parts

2Fig. 22Fig. 4

compression(negative)
ZAS cast parts(positive)
Total22Fig. 3 PatternFig. 4 ZAS cast parts (positive)

Fig. 5 Bracelet mold end

Dimension correction part

3.Each type of mold
(1) Mold for compression molding (e.g. Fig. 1)
A large number of this type molds are stored in Celluloid Houses Yokohama. They are mainly for accessories. The
overwhelming majority are hand-carved on gunmetal. The ones in Osaka were broach 6, catcher, bracelet, and 1 eachof the ornamental square plates.
Characteristic-1. Large "rose" brooch
Table 1, No.14, the loose broach mold shown in Fig. 1 has a 7cm degree of finish.
Maybe the biggest example as a brooch.
-2. Size adjustment of bracelet
Table 1, No17, the end of the bracelet mold is crushed by 43mm with lead-alloy (seeFig. 5). It seems that the dimensions were adjusted. This amendment, including otherarticles, is unusual.
(2) Cavity insert
There was a cavity insert (Fig. 2). It is a ZAS cast product and is compatible withmolds that are pot transfer molding or injection-molded (=for cellulose acetate orsynthetic plastics).
It was attached as a cavity part to a mold base made of steel. In this case, a fixing
screw (M6 female screw) is cut on the back side (Fig. 6).

Fig. 6 Female thread for insertion
piece mounting

(3) Pattern
There were eight patterns of various aspects (example Figure 3). The pattern is a model (= positive) that has the same shape as themold, when a large number of cavities are made by casting. Low melting point zinc-alloy (ZAS) is used as the cavity material. For
patterns, gunmetal is used which has a higher casting temp. than ZAS and is easy to be processed (engraved). Fig. 7 shows theprocess of forming a ZAS set piece from a gun metal master.
Fig. 7 Process for ZAS cavity insert

Molten ZAS
Pattern (gun metal)

Base plate

ZAS cavity

Normally, the cavity insert is made as shown in Fig. 8, and pattern is screwed to the base plate and subjected to ZAS casting. In thiscase, the back of the master is provided with a female screw for mounting. The screw sizes were M5 and M6. Some were integral withthe base plate (Table 1, No.7, Fig. 9).
Fig. 8 View of the screw set

Fig. 9 Pattern integrated with the base plate Fig. 10 Examples of ZAS cast parts(4) Negative ZAS parts
Two of ZAS negatives parts shown in Fig. 9 (Table 1, 1 and 2) were included. It seems to be processed to a cavity insert.
(5) Positive ZAS parts
There were positive ZAS parts (Table 1, 3, 4, and Fig. 4). This application is not known. If it is assumed that ZAS was used toconfirm the cavity configuration at a stage where the celluloid could not be used for some reason.

4.At the end
This collection contains a variety of molds and jigs, as well as items that cannot be stored (or found) in Celluloid House Yokohama.
In particular, ZAS casted parts are used to identify the mold fabrication process and the mold construction. It is an important proof
when considering the actual mold fabrication/molding sequence. In this sense, it is valuable, and I hope that it will be kept in thecollection and continued to be exhibited and investigated.
Table 1: List of molds stored in OsakaNo.

TypeProduct name

Negaposi

MaterialDimensions

Note 11

Cast productFemale image

NegativeZAS

40.3φX69.2H

Pre-processing cavity insert

2Cast productFemale imageNegativeZAS

40.5X66H

3

Cast productFemale image

Positive

ZAS

32. .3X43.2X35

Transfer of No.6

4

Cast productFemale image

Positive

ZAS

29.4φX23.1h

Transfer failure

5

Cavity insert

Female image

Negative

ZAS

23.1φX25.8h

With set screw tapping (M6)6

Mold forFemale image

Negative

Gun metal

31.1X42.4X14.5

Carved into an ellipse on

compression

Note 2

With flash

the back

7

Pattern

Rose

Positive

Gun metal

50.9φ×40.8h

Integrated structure

8

Mold for

Rose

Negative

Gun metal

50.2X57.5X28.4

Stamped "25"compression
9PatternHexagonal print

Positive

Gun metal

40.2φX37.5h

Scratch mark on the side

10PatternGirl

Positive

Gun metal

31.1X42.4X14.5

Carved on the back11

Mold forRound flower

Negative

Gun metal

52.2X52.4X12.5

Stamped of "17"compression

bundleMold for

Darya

Negative

Gun metal

60.4X50.6X10.3

Scratches on the backChrysanthemum

Negative

Gun metal

60.1X50．6X10.3

Rose

Negative

Gun metal

77.7X79X13.8

Rose square plate Negative

Gun metal

129.7X73.3X16.8

Headband

Negative

Gun metal

222X34.8X13.3

Bracelet

Negative

Gun metal

281X28.2X14.3

End 43 mm mashing

12

Screw assembly (M6)compression
13

Mold forcompression

14

Mold forLargest as a brooch (approx. 7cm)

compression
15

Mold forcompression

16

Mold forcompression

17

Mold forcompression

18

Pattern

Dogs.

Positive

Gun metal

37X41X10.2

Hind foot failure

19

Pattern

Rose

Positive

Gun metal

46.3X40.2X10

M5 eyelet

20

Pattern

Lily

Positive

Gun metal

44.7X41X10.4

M5 eyelet

21

Pattern

Sunflower

Positive

Gun metal

46X41X10.4

M5 eyelet

22

Pattern

CowboyPositive

Gun metal

42.3X49.3X9.1

M6 eyelet(Refer to attached photo)M6 eyelet

(Attached photograph-I)
No. 1 ZAS negative parts Female image

No. 2 ZAS negative parts Female image

No. 3 ZAS positive parts Female image

No. 4 ZAS positive parts Female image (positive).

No. 5 ZAS negative parts Female image

No. 6 Mold for compression Female image

(Attached photograph-II)
No. 7 Pattern of gun metal

Rose

No. 8 Mold for compression

Rose

No. 9 Pattern of gun metal

Hexagonal print

No. 10 Pattern of gun metal

GirlsNo. 11 Mold for compression Round flower bundle

No. 12 Mold for compression Darrier(Attached photograph-III)
No. 13 Mold for compression Chrysanthemum

No. 14 Mold for compression

No. 15 Mold for compression

No. 16 Mold for compression Headband

Rose square plates

No. 17 Mold for compression Bracelet

No. 18 Pattern of gun metal

Rose

Dog

(Attached photograph-IV)
No. 19 Pattern of gun metal

Rose

No. 20 Pattern of gun metal

Lily

No. 21 Pattern of gun metal

Sunflower

No. 22 Pattern of gun metal

Cowboy