How compression molded clay chips are made (2 Viewers)

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Are there any resources available that detail and explain the step-by-step processes for making compression-molded clay chips? Like a "How It's Made" episode?

I'm very familiar with stamping and general molding processes, but I am looking more for how they do the edge spots, measure out and place the clay consistently, general mold tool designs, how they make and place the printed inserts, etc.
 
Are there any resources available that detail and explain the step-by-step processes for making compression-molded clay chips? Like a "How It's Made" episode?

In detail? Mostly, no.

There have only ever been a few companies that have made compression-molded clay chips, and none of them published much information about it. Making casino chips is the same as making money, and the few companies that have done it treated most aspects of their production methods and business operations as highly confidential. In fact, David Spragg of Classic Poker Chips (one of the two remaining manufacturers) has said that, as a holder of a Nevada gaming equipment license, he is forbidden by law from revealing details about how his chips are produced.

We do, however, know quite a bit about the generalities involved.

Here's one informative picture:

1623792458931.png


And here's another:

1623792496882.png



how they do the edge spots
Edge spots (technically called "inserts") are cut from round blank slugs, as shown in the picture above. The chipmakers have different punches corresponding to the different available spot patterns. For example, if making a chip with a black body and three yellow 1/4" spots (which would be called a 314 spot pattern), they'll use the die to punch out three 1/4" spots from a yellow blank and then use the same die to punch a black blank. They'll use the yellow spots from the punched yellow blank and put them in the holes left in the punched black blank.

measure out and place the clay consistently
There's no measuring involved; it's done using prefabricated punches. Round punches cut out the blanks from the clay sheets, and "punched poker chip"-shaped punches cut out the inserts and the holes for the inserts.

Clay is placed by hand within the molds in the press, including putting the punched blank into the mold cup and then putting the inserts into the holes in the blank in the mold cup.

general mold tool designs
Molds are made by machining. A master die, or hob, is machined out of hardened steel. It looks like a die that's used in striking coins. The hob is used to strike mold cups. The mold cups are used in the press to make poker chips. It takes two mold cups - one for each side - to make one chip; the cups are placed in what's called a "shoe" within the press, and can be swapped in and out to make different chips for different runs on the press.

Here's a great post with some examples: https://www.pokerchipforum.com/threads/redbellys-crown-jewels.3820/page-2#post-15370

how they make and place the printed inserts
Those are called "inlays"; the edge spots are called "inserts".

Inlays are lithographically printed on paper or vinyl and are usually then laminated with a protective layer of clear plastic, then cut out using dies into circles or other shapes. They're placed by hand on the blank chip (probably done outside the press, but that's one of those details that we don't have much visibility into). There's a bit of adhesive which holds the inlay in place until the chip is pressed.

Don't confuse an "inlay" on a compression-molded chip with a "decal" (aka label aka sticker) on an injection-molded chip. With injection molded chips, the chip is made in its entirety, and then the decal is adhered onto the surface of the recess that's molded into the chip. With compression-molded chips, the inlay is pressed into the surface of the recess that's molded into the chip during the molding step in the press.

There's tons more we could talk about! You can search the forum and read about specific things you're curious about, or feel free to ask specific questions here. Someone will answer, to the best that we can, given what little public knowledge exists.

Welcome to the forum!
 
In detail? Mostly, no.

There have only ever been a few companies that have made compression-molded clay chips, and none of them published much information about it. Making casino chips is the same as making money, and the few companies that have done it treated most aspects of their production methods and business operations as highly confidential. In fact, David Spragg of Classic Poker Chips (one of the two remaining manufacturers) has said that, as a holder of a Nevada gaming equipment license, he is forbidden by law from revealing details about how his chips are produced.

We do, however, know quite a bit about the generalities involved.

Here's one informative picture:

View attachment 720149

And here's another:

View attachment 720150



Edge spots (technically called "inserts") are cut from round blank slugs, as shown in the picture above. The chipmakers have different punches corresponding to the different available spot patterns. For example, if making a chip with a black body and three yellow 1/4" spots (which would be called a 314 spot pattern), they'll use the die to punch out three 1/4" spots from a yellow blank and then use the same die to punch a black blank. They'll use the yellow spots from the punched yellow blank and put them in the holes left in the punched black blank.


There's no measuring involved; it's done using prefabricated punches. Round punches cut out the blanks from the clay sheets, and "punched poker chip"-shaped punches cut out the inserts and the holes for the inserts.

Clay is placed by hand within the molds in the press, including putting the punched blank into the mold cup and then putting the inserts into the holes in the blank in the mold cup.


Molds are made by machining. A master die, or hob, is machined out of hardened steel. It looks like a die that's used in striking coins. The hob is used to strike mold cups. The mold cups are used in the press to make poker chips. It takes two mold cups - one for each side - to make one chip; the cups are placed in what's called a "shoe" within the press, and can be swapped in and out to make different chips for different runs on the press.

Here's a great post with some examples: https://www.pokerchipforum.com/threads/redbellys-crown-jewels.3820/page-2#post-15370


Those are called "inlays"; the edge spots are called "inserts".

Inlays are lithographically printed on paper or vinyl and are usually then laminated with a protective layer of clear plastic, then cut out using dies into circles or other shapes. They're placed by hand on the blank chip (probably done outside the press, but that's one of those details that we don't have much visibility into). There's a bit of adhesive which holds the inlay in place until the chip is pressed.

Don't confuse an "inlay" on a compression-molded chip with a "decal" (aka label aka sticker) on an injection-molded chip. With injection molded chips, the chip is made in its entirety, and then the decal is adhered onto the surface of the recess that's molded into the chip. With compression-molded chips, the inlay is pressed into the surface of the recess that's molded into the chip during the molding step in the press.


There's tons more we could talk about! You can search the forum and read about specific things you're curious about, or feel free to ask specific questions here. Someone will answer, to the best that we can, given what little public knowledge exists.

Welcome to the forum!
Great post!
The only thing I can think of is the last step, where chips are stacked (not sure how many at a time) and spun on a lathe. The extra plastic/clay on the edge is trimmed down to an exact size so that all the chips are equally sized and perfectly round.
 
Thanks! All that information makes perfect sense now. I was wondering how much was done by hand, like the colored edge inserts and the center inlays. I was trying to imagine how that was automated, but couldn't envision it. Now it makes sense :)

I'll keep digging myself for more details. But this does give a great overview of each step. Many thanks for taking the time to explain!
 
.... Also, if the surface of the mold is textured , it will put texture flush across the inlay and chip surface with no " seam", , or if the mold is smooth, then a smooth inlay,. Unlike a label/sticker on re-labled or plastic/ceramic /China clay chips, where the label itself has the texture, before it is applied.
 
.

Don't confuse an "inlay" on a compression-molded chip with a "decal" (aka label aka sticker) on an injection-molded chip. With injection molded chips, the chip is made in its entirety, and then the decal is adhered onto the surface of the recess that's molded into the chip. With compression-molded chips, the inlay is pressed into the surface of the recess that's molded into the chip during the molding step in the press.
Just to clarify, I do not believe there is any recess, unless the mold cup itself has a recess, which only a couple of CPC molds have ... ( if you were to order blank MD50's or B molds, there's no recess, but the Fluer De lies mold will create a recess on unlabeled chips ...) ...
The inlay is placed onto the blank, and compressed flush into the chip clay under high pressure, weather it's a shaped or round inlay, 7/8, 1" 1.25 or whatever... There aren't any round or shaped "holes" or sized recesses created in the blank, AFAIK, ( Which would be "lower" than the mold surface), but hopefully @BGinGA can chime in to verify...
Since the inlay is pressed down into / displacing the clay, removing a finished chip's inlay will create a slight recess, from the missing inlay ...
 
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Just to clarify, I do not believe there is any recess, unless the mold cup itself has a recess, which only a couple of CPC molds have ... ( if you were to order blank MD50's or B molds, there's no recess, but the Fluer De lies mold will create a recess on unlabeled chips ...) ...
The inlay is placed onto the blank, and compressed flush into the chip clay under high pressure, weather it's a shaped or round inlay, 7/8, 1" 1.25 or whatever... There isn't any round or shaped "hole" or sized recess created in the blank, AFAIK, ( Which would be "lower" than the mold surface), but hopefully @BGinGA can chime in to verify...
Since the inlay is pressed down into / displacing the clay, removing a finished chip's inlay will create a slight recess, from the missing inlay ...

Yes, that's all correct. I was broadly referring to chips such as THC, RHC, Paulson house molds, and so forth which have molded center recesses. As you point out, there are plenty of other molds which are flat across the face and don't have molded recesses.

Injection-molded chips that are intended to take decals have molded recesses, since otherwise the decals wouldn't fit. They adhere on top of the surface of the chip, and if there weren't a molded recess to accommodate them, they'd make the chip thicker and create what we call "spinners", and they would stack poorly. Compression-molded chips don't need a recess for this purpose; some molds (including most Paulsons) have recesses because they enhance the appearance and, I suspect, improve the chips' handling and durability somewhat, while other molds are simply flat. As you say, and as I intended to express, the inlays are pressed down into the clay by the mold and will be flush with the surface of the chip - whether that surface is flat across the chip's face as with, for example, the Roman mold, or is recessed below the chip's face as with, for example, THCs.
 
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Anyway, I’m pretty sure the classic method is to smooth the clay out with a rolling pin to form a sausage-like roll exactly 39mm in diameter, carefully slice it like a pepperoni stick, then fire it in your oven at 425º for 40-50 minutes or until brown.
 
Where's the picture of the ASMs still in the cups, with flashing running everywhere? Was it taken down at David's request? I seem to recall is was not an authorized picture...
 
Where's the picture of the ASMs still in the cups, with flashing running everywhere? Was it taken down at David's request? I seem to recall is was not an authorized picture...
Here it is!

1623868867542.png


It's posted in a few different threads on PCF. No idea what David or Tommy think about its presence.
 
Anyway, I’m pretty sure the classic method is to smooth the clay out with a rolling pin to form a sausage-like roll exactly 39mm in diameter, carefully slice it like a pepperoni stick, then fire it in your oven at 425º for 40-50 minutes or until brown.
Just like mamma used to make!
 
Interesting theory! My guess is that the spots are "larger" than the base. Maybe CPC uses different punches for the spots and the bases, and the spots are punched a little larger than they need to be in order to ensure they fill the holes well, while the bases are punched only slightly larger than they need to be.

Total speculation, of course.
 
Also, different colors soften and melt at different temperatures, so for any pressing there's going to be some colors that are softer and runnier than others. That's one reason that you sometimes get "split spots". David discusses it somewhat here and also elsewhere in that thread.
 
Interesting theory! My guess is that the spots are "larger" than the base. Maybe CPC uses different punches for the spots and the bases, and the spots are punched a little larger than they need to be in order to ensure they fill the holes well, while the bases are punched only slightly larger than they need to be.

Total speculation, of course.
Well, here's a picture of some chips pre-final molding but post-first molding if you want to draw conclusions from it:
EDB10C1F-2C74-44CE-85B0-870D996988B9.png

Your idea seems to hold true in most of these chips.
 
FWIW: A while back I did a ton of searches for poker-related patents, and turned up details on a number of chip designs, from recent GPI hybrid clays/jetons, all the way down to dice chips... See the thread here:

https://www.pokerchipforum.com/threads/poker-chip-patent-madness.28163/
Just looked through that thread and decided to search for some other GPI patents, and I believe this one (https://patents.google.com/patent/US20080258385) describes some of their clay chip-making process. Here's the specific image that shows how they compress their chips automatically:
PaulsonCompressionMachine.PNG

Pretty cool stuff. If I read the patent correctly, 10 is a hopper that has a bunch of chip slugs, which go down the little track to 13, get pushed into the cups, pressed, and then dropped down along 52 into 50 to collect the chips.
 
David Spragg has said that, while CPC still does pretty much everything by hand, GPI has been able to invest in some degree of automation (without being specific about what or how).
 
This particular bit of machinery seems different from the mold press. It seems more like a stamper, used specifically to stamp a fine crosshatch texture onto a chip, in order to keep the chips from sticking to each other.

An attempt to solve the infamous "Bud Jones suction" problem?
 
This particular bit of machinery seems different from the mold press. It seems more like a stamper, used specifically to stamp a fine crosshatch texture onto a chip, in order to keep the chips from sticking to each other.

An attempt to solve the infamous "Bud Jones suction" problem?
Perhaps it was used on these:
118229.jpg
116545.jpg
120567.jpg
 
Thanks to everyone for all of the info! This discussion has turned out even better than I had expected. I am amazed at the wealth of knowledge from the members of this group. I look forward to learning more and contributing even more in the future.
 
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One thing that's driving me crazy is trying to figure out how they get the edge spots to form those nice arrows on the sides of the chip. I would think if you're just crushing the chip flat, you wouldn't get such regular triangular crush zones.
 
One thing that's driving me crazy is trying to figure out how they get the edge spots to form those nice arrows on the sides of the chip. I would think if you're just crushing the chip flat, you wouldn't get such regular triangular crush zones.

Those are not intentional and are generally considered not desirable even though a lot of us do like them as a sign of real clay. The different colors are created by using different compounds and therefore they have different properties. So certain color combinations and spot widths create different effects when they are pressed and they mix. It is highly undesirable when the spots actually split so that the base chip color cuts all the way through the spot. Those are called “split spots”.

Here is some discussion on the issue related to CPC chips: https://www.pokerchipforum.com/threads/split-spots-on-diamond-square-mold-from-cpc.68741/
 
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I can see why people would not like the split spots. It's not a good look, and it's more like the chaos I would expect from crushing a bunch of material into a tiny space.

But I still think that when they form into regular arrow shapes it looks really nice. I can't figure out why it would be undesirable.
 

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