Printing Iron Drying Room Line Chains

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Printing Iron Drying Room Line Chain 25.4 mm Pitch for Metal Decorating Ovens - 39 Attachment Chains OEM China Factory

The printing iron drying room line chain is a roller conveyor chain built to carry printed and coated metal sheet through a drying room. Its base is a standard short pitch precision roller chain, and the attachment work sits on top of that base: one side carries inner and outer supporting plates that hold the run straight, and the other side carries flower racks on inner and outer attached plates that carry the sheet. The fifteen tables below set out thirty-nine chain numbers on that base, with the plate, pin, length and strength figures for each one.

This page is written to be read as a specification. Every figure quoted here is taken from those fifteen tables, and the sections after them pull out the relationships that are not obvious from any single table on its own.

The equipment this chain serves prints on the surface of metal sheet and then dries or conveys the sheet after coating. That puts two demands on the chain that an ordinary conveyor chain does not face. The first is heat: a drying room holds an elevated temperature for the whole shift, so the chain has to hold its dimensions while warm rather than only while cold. The second is chemistry: the inks, varnishes and solvents used in metal decorating give off vapour inside the oven, and that vapour settles on whatever is inside.

The construction answers both. The supporting plates on one side keep the run straight, which matters because a sheet line cannot tolerate the side-to-side wander that a plain roller chain develops once the pins begin to wear. The flower racks on the other side carry the product clear of the chain itself, so the sheet is not resting on the rollers. Because both are attachments on a standard base chain rather than a special-purpose chain, the wearing parts underneath remain ordinary roller chain parts.

The page describes the design as one that optimises the structure and uses high-quality material and advanced processing, with the result being high matching accuracy, stable conveying and high synchronisation. Read against the tables, those three claims map onto specific figures: matching accuracy onto the tight grouping of pitch and roller diameter, stable conveying onto the repeated plate depths, and synchronisation onto the near-constant inner plate widths.

Custom attachments are offered alongside the tabulated range, which is what the fifteen separate tables reflect. A metal decorating line is usually built around one sheet size and one oven, so the attachment that carries the sheet is made to suit that line rather than chosen from a catalogue series.

The fifteen tables are not fifteen alternatives. They are fifteen attachment families, and the split between them sits in the column set rather than in the chain numbers.

Thirty-nine chain numbers, all different. Every chain number on the page appears once and once only, so the range holds thirty-nine distinct parts rather than thirty-nine positions that repeat a part.

Table size varies by a factor of eight. Eight of the fifteen tables carry a single chain number. Seven carry more: one holds eight, two hold six, one holds five, and three hold two. Table 1 is the largest at eight rows and Table 3 the next at five.

Five tables share one column set. Tables 5, 7, 8, 13 and 14 print the same fourteen column headings in the same order, down to the max and min qualifiers, and Tables 10 and 11 share a thirteen-column set of their own. A buyer moving between those tables is reading the same layout with different numbers in it.

No two tables print the same column list otherwise. The remaining eight tables each have their own arrangement, which is why the tables have to be read one at a time rather than treated as one long list.

Seven quantities appear on every one of the thirty-nine rows. Pitch, roller diameter, pin diameter, the first pin length, the H and F assembly dimensions, and the tensile rating are printed for every chain number without exception. Everything else is optional, and the sections below take each of those optional columns in turn.

The base is an inch-series roller chain. Thirty-eight of the thirty-nine rows are on a 25.4 mm pitch, which is one inch exactly, and thirty-eight are on a 15.88 mm roller, which is five eighths of an inch. The odd row on each count is discussed further down; the point here is that the range is built on one base chain, and the attachment differs rather than the chain underneath.

The chain numbers divide into four attachment families and one outsider. Twenty-two numbers begin with HX16AF, seven with 16AF, four with HX16BF, four with 16BF, and two with HXP. Thirty-seven of the thirty-nine carry the digits 16, and twenty-eight begin with the letters HX.

What the letters mean. The 16 is the chain size of the base chain, which is the one-inch series. AF and BF distinguish the two attachment types, and the HX prefix marks the members of each family that carry it. Twenty-two of the thirty-nine sit in the HX16AF group, which makes it by far the largest family on the page and the first place to look when the attachment is not already known.

What the numbers after the letters mean. Each family is then numbered: the HX16AF group runs from HX16AF4 to HX16AF61, the 16AF group from 16AF7 to 16AF90, and the two BF groups together from 2 to 57. The numbers are revision or drawing references rather than an ordered series, so a higher number does not mean a larger, stronger or later part.

The two HXP numbers work differently. HXP31.75 and HXP25.4F1 name their pitch in the chain number itself, 31.75 mm and 25.4 mm, instead of carrying a revision number. Both are one-row tables and both break the pattern set by the other thirteen, which is why they are treated as a pair further down.

Seven columns are complete across the page, and they are worth listing before the variations, because a chain number is usually identifiable from these alone.

Pitch, P. Two values only: 25.4 mm on thirty-eight rows and 31.75 mm on the HXP31.75. This is the least varied column on the page.

Roller diameter, d1. Also two values: 15.88 mm on thirty-eight rows and 30.00 mm on the HXP25.4F1. Tied with pitch as the least varied figure here.

Pin diameter, d2. Three values across thirty-nine rows: 7.92 mm on thirty-two, 8.28 mm on six, and 7.9 mm on the single HX16AF16. The last of those is the 7.92 figure written to one decimal place.

Pin length L1. The most varied figure on the page, with twenty-three distinct values, running from 36.5 mm up to 98.0 mm. Even so, it is printed on every row, and it is the only one of the three pin length columns that is.

Assembly dimension H. Also twenty-three distinct values, and also printed on all thirty-nine rows, running from 44.3 mm to 96.9 mm.

Assembly dimension F. Twenty-one distinct values, running from 12.3 mm to 30.55 mm.

Tensile rating, Q. Six distinct kilonewton figures and eight distinct pound figures, taken as a pair on every row.

The contrast is the useful part. Pitch and roller diameter take two values each, while L1 and H take twenty-three each. A replacement is therefore pinned down by the length and height figures far more tightly than by the pitch, which will be 25.4 mm on almost anything the buyer is holding.

The tabulated range is the starting point rather than the limit. Most custom orders for this product come in as a drawing, and the attachment is then produced to that drawing. If a drawing is not available, a sample of the part being replaced is enough to work from, and an existing catalogue is accepted as a third route.

Where a line is being rebuilt rather than repaired, send the sheet format, the attachment pitch along the run and the oven length with the enquiry, because those three figures decide how many attachments sit on the chain and how the pitch divides the run. Where an existing chain is being replaced, the drawing or the sample is the more reliable of the two, since it carries the dimensions the line was built to rather than the dimensions the old chain has worn to.

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The width between the inner plates, printed as b1 on fourteen of the fifteen tables, is the second most useful column after the pin lengths. It is written in eight different forms across the thirty-four rows that print it: 15.75 mm on sixteen rows, 19.00 mm on eleven and 19.0 mm on one more, 25.00 mm on two, and 16.00 mm, 17.00 mm, 17.80 mm and 18.00 mm on one row each.

The pin diameter, d2, is much steadier. It reads 7.92 mm on thirty-two rows, 8.28 mm on six, and 7.9 mm once, on the HX16AF16, which is the 7.92 figure written to one decimal place rather than a third size.

The two columns are not independent, and the way they pair is the single most useful thing on this page for anyone identifying a chain by measurement.

The 8.28 mm pin is a BF-family feature. All six rows that carry it belong to the BF attachment families: the 16BF10, 16BF27, HX16BF8 and HX16BF27 in Table 1, the 16BF12 in Table 2, and the HX16BF10 in Table 3. No AF chain anywhere on the page uses it. The eight BF chains split six to two, with the 16BF57 and the HX16BF2 keeping the 7.92 mm pin, so being a BF chain raises the odds without settling it.

Width alone does not fix the pin. The 19.00 mm figure is the clearest case. Printed on twelve rows once the 19.0 mm spelling on the HX16AF16 is counted in, it splits seven at 7.92 mm, four at 8.28 mm and one at 7.9 mm. Both pin sizes therefore share a single plate width, so a chain measuring 19.00 mm across the inner plates could be either. Every row on the 8.28 mm pin does carry a wide plate, at 18.00 mm or 19.00 mm, but the converse fails.

One width is unambiguous. The 15.75 mm figure appears on sixteen rows and is paired with the 7.92 mm pin on all sixteen, without a single exception. If the width measures 15.75 mm, the pin is settled. The 25.00 mm width is paired with 7.92 mm on both of its rows as well, though two rows are a thinner basis for a rule than sixteen.

Three columns carry pin length. On most rows they run in order, with L the smallest figure, L1 the middle one and L2 the largest, which is the arrangement a buyer expects. On a substantial minority of rows that order does not hold, and it is worth knowing which column to read before quoting a dimension.

L2 is the largest of the three on twenty-nine of the thirty-nine rows. L1 is the largest on the remaining ten. So the overall length sits in a different column on roughly one row in four, and the L1 column is not simply a second pin length on those ten rows.

Four tables do not print L2 at all. Tables 3, 10, 11 and 15 carry no L2 column, which accounts for eight of the ten rows where L1 is the longest. On Table 3 the L1 values run 75.2 mm to 81.1 mm against L values of 32.7 mm to 40.9 mm, and on Table 11 the single L1 reads 98.0 mm against an L of 47.0 mm. The other two rows where L1 wins are the HX16AF10 in Table 4 and the HX16AF37 in Table 7, where L2 is present but smaller, at 43.1 mm against an L1 of 44.9 mm on both.

The three dashes. Three cells in these fifteen tables print a dash instead of a number, and all three sit in the L column: the 16AF7 and the HX16AF54 in Table 6, and the HX16AF47 in Table 14. Every other cell on the page carries a figure. A dash in that position means the first pin length is not stated for that attachment, so the length has to be taken from L1 and the drawing rather than from a printed figure.

The spread. The largest of the three length figures on a row ranges from 38.9 mm on the HXP25.4F1 up to 98.0 mm on the HX16AF13, a factor of about two and a half across one page. The L2 column by itself runs from 43.1 mm to 88.8 mm, and the L column from 32.7 mm to 47.0 mm.

Plate depth is the steadiest of the larger dimensions. It is printed on thirty-eight rows and reads 28.3 mm on twenty-three of them, so more than half the range shares one depth. The remaining fifteen rows spread across ten other values, from 21.0 mm on the 16BF12 up to 30.45 mm on the HX16AF16, and the whole column fits inside a 9.45 mm band.

Plate thickness is printed in three different ways, and that is where the reading gets awkward.

As a single T column. Eighteen rows carry T on its own. It reads 3.10 mm on eight of them, 3.25 mm on seven, 4.00 mm on two and 3.0 mm once. Note that 3.10 mm appears only in this column and never inside a combined cell, so a thickness of 3.10 mm is a value this range prints in one form only.

As a combined t/T column. Twenty-one rows carry t/T, and nine of those twenty-one print two figures in the cell separated by a slash: 3.25/3.00 on eight rows and 4.00/3.25 on one. The other twelve print a single figure.

As separate T and t columns. Table 2 is the only table that splits them, giving the 16AF86 and the 16BF12 a T cell and a t cell of their own. That is why the 4.15 mm figure appears once on the page, on the 16BF12, and nowhere else.

The practical consequence is that a thickness must never be compared across tables without checking which form the cell takes. A cell reading 3.25 and a cell reading 3.25/3.00 are not describing the same thing. The nine combined cells are not confined to one part of the page either: all six rows of Table 8 use the two-figure form, and so do one row of Table 5, one of Table 7 and one of Table 10, while all six rows of Table 6 use the single figure.

These three columns describe the attachment as fitted rather than the chain link, and they are the most varied figures on the page.

H and F are on all thirty-nine rows and are almost unique to each chain. H takes twenty-three distinct values and F takes twenty-one, and between them they form thirty-two distinct pairs across thirty-nine rows. Only seven rows share their H and F combination with another row, which means these two figures identify a chain number more sharply than anything else in the tables.

H is not the same as the pin length. The H column ranges from 44.3 mm to 96.9 mm, which is a similar band to the lengths, and the two are easy to confuse when reading down a table. H is the assembly height, and it changes with the attachment fitted rather than with the pin.

F spans a wider ratio. It runs from 12.3 mm on the HX16AF16 to 30.55 mm on the HXP25.4F1, and two rows sit far outside the rest: the HX16AF32 at 29.7 mm and the HXP25.4F1 at 30.55 mm, against a body of rows that mostly sit between 14.5 mm and 19.1 mm.

C is the steadiest of the three and is printed on thirty-five rows. It reads 10.0 mm or 10.00 mm on nineteen rows and 10.15 mm on seven, so twenty-six of the thirty-five sit at 10.0 mm or just above it. The remaining nine spread from 11.00 mm up to 13.00 mm, with a single 12.3 mm on the HX16AF56. Because C is nearly constant, it is a poor column to select on, but a good one to confirm with.

The last column on most of these tables gives a tensile rating as two figures separated by a slash, the kilonewton value first and the pound-force value second. Six distinct kilonewton figures appear across the page: 40.0, 54.0, 55.6, 56.0, 56.7 and 68.9 kN, from a floor of 40.0 kN to a ceiling of 68.9 kN.

One rating covers most of the range. The 55.6 kN figure is printed on twenty-three of the thirty-nine rows, so nearly three chains in five are rated at the same figure. The next most common, 54.0 kN, covers six rows.

The pound figures do not all follow from the kilonewton ones. There are eight distinct pound values against six distinct kilonewton values, and multiplying each kilonewton figure by 224.81 accounts for five of the eight exactly. The 40.0 kN rating yields 8992 lbf, the 54.0 kN yields 12139, the 55.6 kN yields 12499, the 56.0 kN yields 12589, and the 56.7 kN yields 12746.

Three do not follow. The 40.0 kN rating also appears twice as 9090 lbf, and 9090 corresponds to 40.43 kN rather than 40.0. The 54.0 kN rating appears once as 12148 lbf, which corresponds to 54.04 kN. And the 68.9 kN figure is paired with 15488 lbf, where the product of 68.9 and 224.81 comes to 15489, one unit higher.

The two widest discrepancies both sit in the same place. The 9090 lbf pair is on the 16BF10 and the 16BF27 in Table 1, and the 12148 lbf figure is on the HX16AF16 in Table 9. Everything else in the column is consistent to within a single pound.

Two further printing habits are worth noting. Table 12's units row reads kN/bf rather than kN/lbf, with the l dropped, and the header of the tensile column is printed as min on the five tables whose rows carry the long lists of chain numbers, against Q min on the other ten. Neither affects the figures, but both will confuse a reader who is matching headers rather than columns.

Three tables depart from the arrangement the other twelve follow, and in each case the departure is the most useful thing about the table.

Table 12, the HXP31.75, and the alternative pitch. Every other row here is on 25.4 mm. This one is on 31.75 mm, a quarter of an inch longer, and rather than a revision number the chain number states that pitch outright. The 17.80 mm inner plate width in its b1 cell belongs to no other row, and it is the one table whose column list matches no other.

Table 15, the HXP25.4F1, and the double roller. Its roller diameter reads 30.00 mm against 15.88 mm on the other thirty-eight rows, close to twice the size, so it is the only chain here that cannot be identified from the roller figure alone. It is also the shortest table on the page at eleven columns, and the only one that prints h2 for plate depth, reading 20.5 mm, and 3.0 for thickness.

Table 3, and the h1 column. Table 3's third column is headed h1 min. On the other fourteen tables that position is headed b1 min, and it carries the width between the inner plates. Three details point the same way. Table 3 already prints a separate h column for plate depth, reading 25.0 mm to 28.3 mm across its five rows, so h1 is not serving as the depth here. The five h1 values are 15.75 mm, 15.75 mm, 17.00 mm, 15.75 mm and 19.00 mm, and every one of those numbers also appears in the b1 column of the other tables. And Table 3 is the only table on the page that prints no b1 column at all.

That does not change any figure. It does mean that anyone reading Table 3's header literally will look for an inner plate width, fail to find one, and misread the third column as a second plate dimension. The value to use as the inner plate width on that table is the h1 figure.

Eight tables carry one chain number: Tables 4, 7, 9, 10, 11, 12, 13 and 15. Seven carry more, with the largest at eight rows. The split is not arbitrary, and it tells a buyer where to expect variation.

The multi-row tables cluster the BF family and the short attachments. Table 1 alone holds six of the eight BF-family chains on the page, and the other two sit in Table 2 and Table 3. The attachments whose plate width and plate depth change between revisions are the ones that need a table with several rows, because the variation is in the attachment rather than in the base chain.

The single-row tables are the settled and the bespoke. Six of the eight are in the HX16AF family, and the other two are the HXP chains. A single-row table normally means either that the attachment has one revision in production or that it was made to one customer's drawing and never developed further. The two HXP chains belong to the second group, since both carry a pitch or a roller that appears nowhere else on the page.

Read the table size before reading the table. A single-row table is a specification. A multi-row table is a choice, and on Table 1 that choice is between eight attachments whose pin lengths, plate depths and strengths all differ. Quoting a chain number from a multi-row table without the row is therefore not enough, because the figure that separates the rows is precisely the figure the buyer is choosing.

Thirty-nine numbers, no repeats. Despite the range being spread over fifteen tables, no chain number appears twice. Where two tables look alike, as Tables 5, 7, 8, 13 and 14 do with their identical fourteen-column layout, the chain numbers underneath them are still distinct parts.

A drying room line wears differently from a conveyor running at ambient temperature, and the three checks that matter most follow from that.

Check the pitch, not the side plates. Heat and load both show up as elongation, and on a roller chain elongation is measured over a span of pitches rather than on one link. On this range the figure to watch is the 25.4 mm pitch that thirty-eight of the thirty-nine rows are built on, because a chain that has stretched past the line's tolerance will no longer sit correctly on the sprocket even if nothing looks worn.

Look at the attachment, not just the chain. The supporting plates and the flower racks are what the sheet actually touches, and they wear at the contact points rather than along the pin. A rack that has worn thin will still measure correctly on every figure in these tables, so it has to be inspected rather than measured against the specification.

Watch the coating at the pins. The page describes the chain as carrying an anti-corrosion coating, and the solvent vapour in a printing oven attacks exactly that kind of surface. A pin that has lost its coating will corrode in the joint, and the joint is the one place on a roller chain that cannot be inspected without breaking the chain. Where the atmosphere is aggressive, check the pin ends for surface change at every service rather than waiting for a length measurement to move.

Re-check tension after the first hot run. A chain fitted cold and then brought up to oven temperature will change length as it warms, and a run that was correctly tensioned when cold may be wrong when hot. Set the tension to the figure the machine manual gives, then re-check it once the oven has been through a full cycle.

The tables on this page are detailed enough that a replacement can normally be pinned down without a drawing, provided the right figures are taken off the old chain. Four measurements do most of the work.

Take the pin length first. It is the figure that separates the chain numbers most sharply, and it has to be measured on the longest run of pin rather than on a single link, because the L2 column is the largest of the three lengths on twenty-nine of the thirty-nine rows. Measure the full pin with the attachment in place.

Take the assembly dimension H second. It takes twenty-three distinct values, and it pairs with F to form thirty-two distinct combinations across the thirty-nine rows. That combination narrows a chain number further than any other pair of figures on the page.

Then the plate figures. The inner plate width narrows the field to one of eight values, and the plate depth to one of eleven, with 28.3 mm covering more than half the range. Neither settles it alone.

Then the chain number, if it is legible. Thirty-nine numbers, no repeats, and the families are easy to tell apart: the HX16AF group is the largest at twenty-two members. Where the old chain number can still be read, quote it and skip the measuring, since the number is unique on this page and the tables can be matched to it directly.

Where the chain is being replaced on a line that is itself being changed, the numbers matter less than the drawing. Send the sheet width, the spacing between attachments and the length of the oven run, and the attachment will be produced to suit the new line rather than matched to the old one.

What is a printing iron drying room line chain?
A roller conveyor chain built on a standard short pitch precision roller chain, carrying supporting plates on one side to keep the run straight and flower racks on the other to carry the sheet through the oven.

What base chain is it built on?
An inch-series roller chain. All but one of the thirty-nine rows carry a 25.4 mm pitch and a 15.88 mm roller, which are the inch and five-eighths-inch sizes.

How many chain numbers are covered on this page?
Thirty-nine, spread across fifteen attachment tables, and every one of the thirty-nine is a distinct part with no repeats.

What pitch do these chains use?
25.4 mm on thirty-eight rows. The single exception is the HXP31.75 at 31.75 mm, which is the only chain here on a different pitch.

What pin diameter should I expect?
Three values appear: 7.92 mm on thirty-two rows, 8.28 mm on six, and a single row at 7.9 mm. That last figure is the same 7.92 mm written to one decimal place rather than a third size.

How do I tell the two pin sizes apart?
The 8.28 mm pin is used only on BF-family chains, so a 16BF or HX16BF number is the first clue. It is not conclusive, since the 16BF57 and the HX16BF2 use 7.92 mm, and a plate width of 19.00 mm splits between both sizes. The 15.75 mm width is the reliable one: it goes with 7.92 mm on all sixteen of its rows.

Why do some cells print two thickness figures?
Twenty-one rows carry a combined t/T cell, and nine of them give two values separated by a slash, such as 3.25/3.00. The other twelve print one figure. Always check which form a cell takes before comparing a thickness across tables.

What does a dash in the pin length column mean?
That the first pin length is not stated for that attachment. There are three such cells on the page, on the 16AF7, the HX16AF54 and the HX16AF47, and in each case the length has to come from the L1 figure and the drawing.

Why does Table 3 print h1 instead of b1?
It is the only table that does. Its h1 values are 15.75 mm, 17.00 mm and 19.00 mm, all of which also appear in the b1 column elsewhere, and Table 3 carries its own separate h column for plate depth, so the third column is the inner plate width.

What tensile strength do these chains carry?
Between 40.0 kN and 68.9 kN. The most common figure is 55.6 kN, printed on twenty-three of the thirty-nine rows, and the next most common is 54.0 kN on five rows.

Why does one kilonewton figure show two different pound values?
That happens twice. The 40.0 kN rating is printed against 8992 lbf on five rows and 9090 lbf on two, and 9090 corresponds to 40.43 kN. The 54.0 kN rating is printed against 12139 lbf on five rows and 12148 lbf on one.

Can the chain work in a high-temperature drying room?
Yes. The construction uses heat-resistant alloy material, which is what allows it to hold its dimensions through long periods at oven temperature rather than only at ambient.

Will printing solvent corrode the chain?
The chain carries an anti-corrosion coating intended to resist attack from the inks, varnishes and solvent vapour inside a metal decorating oven. Check the pin ends for surface change at each service, because the joint is the one area that cannot be inspected without breaking the chain.

What are the lead times?
Sample lead time is generally 10 workdays. Production lead time is 20 to 40 workdays after the deposit is received.

What if the part I need is not listed here?
Send the product picture and the drawing by email. If no drawing is available, a sample or an existing catalogue can be worked from instead, and the attachment will be produced to it.

A replacement for this product is settled by two things: the chain number and the attachment drawing. Where the number is legible, the fifteen tables on this page will match it and the specification follows from the row. Where it is not, measure the pin length and the H and F assembly dimensions first, because those three figures separate the thirty-nine parts more sharply than the pitch and roller, which take only two values each across the whole range.

For a line being rebuilt rather than repaired, the enquiry needs three figures: sheet width, attachment spacing and oven run length. Nine of the fifteen tables hold more than one chain number, and on those the attachment is the variable rather than the base chain, so the attachment has to come from the machine rather than from the table.

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