PCB Hot-Pressing Paper

Product Brief
High-strength plant fiber: modified treatment, special pulping;High-temperature-resistant fiber: self-developed process for better heat resistance;Sheet forming on the paper machine: paper production on a hybrid paper machine.;Slitting and packaging: online removal of static electricity and dust, paper surface finishing and online quality inspection, and moisture-proof and impact-resistant packaging.

Update Time:08-20-2026

Visit Volume:44

Product Inquiry +86 18802120426

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Detailed introductionProduct Inquiry

I. Manufacturing Process of Premium Thermal Press Paper

Manufacturing Process

➢ High-strength plant fiber: modified treatment, special pulping

➢ High-temperature-resistant fiber: self-developed process for better heat resistance

➢ Sheet forming on the paper machine: paper production on a hybrid paper machine.

➢ Slitting and packaging: online removal of static electricity and dust, paper surface finishing and online quality inspection, and moisture-proof and impact-resistant packaging.

Premium Hot-Pressing Paper VS. Traditional Kraft Paper

Premium hot-pressing paper is specially developed and researched as a cushioning material for the hot-pressing (lamination) process of the copper-clad laminate (CCL), printed circuit board (PCB) and fireproof board (HPL) industries. Compared with traditional kraft paper pressing materials, it has the following features:

➢ Made of high-quality plant fiber, modified special fiber and a unique forming process;

➢ Provides stable and lasting cushioning pressure with good elasticity. Resting for 12 hours before reuse will greatly restore its elasticity;

➢ Heating rate close to that of kraft paper, with uniform heat transfer;

➢ Operating conditions: 210°C, 40 kg, 180 mins; reusable for more than 10 cycles (depending on the specific pressing conditions of the customer);

➢ Operating conditions: below 190°C, 30 kg, 120 mins; reusable for more than 30 cycles (depending on the specific pressing conditions of the customer);

➢ No lint shedding or powder falling during the pressing process;

➢ No sticking to the steel plate and no adhesion between sheets during pressing. Please take moisture-proof measures during use, otherwise the anti-adhesion performance will be greatly reduced;

➢ Greatly reduces the overall cost per pressing cycle, improves production efficiency and reduces the workload of on-site operators;

➢ Basis weight options: 160 g/m², 210 g/m² and 240 g/m²; customization available.

Technical Indicators of Premium Hot-Pressing Paper

Item	Unit	Value
Nominal basis weight	g/m²	160	210	240
Deviation of basis weight (machine direction)	g/m²	±5	±7	±8
Deviation of basis weight (cross direction)	g/m²	±5	±7	±5
Thickness	mm	0.28	0.36	0.48
Thickness deviation	mm	±0.03	±0.03	±0.04
Tensile strength KN/m)	machine direction	6	7	8
Tensile strength KN/m)	cross direction	4	5	6
Smoothness (S )	top side	>15	>15	>15
Smoothness (S )	bottom side	>7	>7	>7
Dirt count (0.2~0.7mm)	pcs/m²	≤10	≤10	≤10
Dirt count (0.8~1.0mm)	pcs/m²	≤1	≤1	≤1
Air permeability	ml/min	400-600	300-500	200-400
Moisture at delivery Max.	%	≤8	≤8	≤8
Deviation of finished product size	mm	±5	±5	±5

Usage Recommendations for Premium Hot-Pressing Paper (for reference only) (VS. Kraft Paper)

Material	Basis weight (g/m²)	Usage	Remarks
Premium hot-pressing paper	240	24 sheets per opening	Take one sheet from each of the top and bottom layers at a time; use for up to 15 times, to be adjusted according to actual customer conditions
Premium hot-pressing paper	160	36 sheets per opening

Cushioning Effect of Premium Hot-Pressing Paper (Thickness Change) — Thickness Test Data

Indicator	Premium hot-pressing paper	Traditional kraft paper	Cycle
Thickness before pressing	0.27	0.2426	1
Thickness after pressing	0.231	0.1766	1
Thickness before pressing	0.231	0.1766	2
Thickness after pressing	0.22	0.1766	2
Thickness before pressing	0.22	0.1766	3
Thickness after pressing	0.2188	Ruptured	3
Thickness before pressing	0.2188	—	4
Thickness after pressing	0.2162	—	4
Thickness before pressing	0.2162	—	5
Thickness after pressing	0.2154	—	5
Thickness before pressing	0.2154	—	6
Thickness after pressing	0.2132	—	6
Thickness before pressing	0.2132	—	7
Thickness after pressing	0.2031	—	7
Thickness before pressing	0.2031	—	8
Thickness after pressing	0.2013	—	8
Thickness before pressing	0.2013	—	9
Thickness after pressing	0.1977	—	9
Thickness before pressing	0.1977	—	10
Thickness after pressing	0.1934	—	10
Thickness before pressing	0.1934	—	11
Thickness after pressing	0.1926	—	11
Thickness before pressing	0.1926	—	12
Thickness after pressing	0.1912	—	12

Heating Rate Comparison (First Pressing)

Material	Basis weight (g/m²)	Set heating rate (°C/min)	Actual heating rate (°C/min)
Kraft paper	2580	1.73	2.58
Premium hot-pressing paper	2400	1.80	2.45
Test result	In the first pressing, with a 7% lower basis weight, the premium hot-pressing paper heated up about 5% slower.

II. Introduction to Standard Hot-Pressing Paper

Product Features

1.Made entirely of high-quality virgin unbleached fiber raw materials, without dyes or fillers

2.Advanced papermaking process, with good sheet formation uniformity and a clean paper surface

3.High bulk of the paper, with good air permeability

4.Small two-side difference, good flatness and a fine paper surface

Product Applications

1.Auxiliary cushioning material for medium and high-grade PCB hot pressing, mainly used as auxiliary cushioning material for hot-press forming of industrial electronic circuit boards

2.Low temperature (below 200°C) conditions, e.g. around 180°C: generally about 5 pressings

3.Medium temperature (≤220°C) conditions: generally about 3 pressings

4.High temperature (above 220°C) conditions: 1-2 pressings

5.If the operating temperature exceeds 220°C, on-machine testing is recommended before batch use

Technical Indicators of Standard Hot-Pressing Paper

Indicator	Unit	Value				Test Method
Basis weight	g/m²	150	160	190	250	—
Bulk	cm³/g	1.50	1.50	1.50	1.50	GB/T451
Smoothness	S	8	6	4	3	GB/T456
Brightness	% D65	36	36	36	36	GB/T7974
Air permeability	um/(Pa·s)	7.0	7.0	6.0	5.5	GB/T458
Tensile strength	KN/m	6.0	7.0	8.0	9.0	GB/T12914
Folding endurance	times	50	50	30	20	GB/T457
Moisture	%	<6				GB/T462

1.The basis weight of the product can be customized, with a range of 150-250 g/m²

2.The product size can be customized, with a product length of less than 2400 mm.

Thermal Press Paper Production Video

Click the play button in the lower-left corner to start the video. If you experience buffering, click the pause button in the lower-left corner of the video window, wait a moment, and playback will resume normally.

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