Scored Tablets in Pressed Candy OEM: Notch Depth, Breaking and Split Dose
In pressed candy contract manufacturing, requests for scored tablets come up far more often than expected. The reason is simple: a tablet that breaks into two halves lets the consumer split a serving, or treat half a tablet as a lighter portion. It sounds like one extra line on a mould, but in practice that line touches four things - tooling precision, hardness distribution across the tablet core, friability, and consistency after breaking. Cut too shallow and it will not snap; cut too deep and it cracks in transit; uneven bonding and one half crumbles into powder. This article explains feasibility, notch parameters and verification from a factory perspective, so the issue is settled during sampling rather than after launch.
First, a boundary: food tablet scoring is not pharmaceutical scoring
One premise has to be stated. Scoring on a medicine exists so patients can split a dose, and regulators impose explicit content uniformity requirements on the halves. Pressed candy and similar products are ordinary food formats. Here the notch serves eating convenience and visual identification; it must not imply dosing concepts or drift into efficacy claims. Food tablet scoring therefore focuses on breaking feel, clean fracture surfaces and visual consistency, while communication stays on format and specification. Draw that boundary first and every parameter discussion afterwards has meaning - and the labelling stage will not create its own problems.
Notch geometry: depth, cutting angle and one or two sides
The critical parameters are depth and cutting angle. Depth is usually expressed as a percentage of tablet thickness, with a practical band between one tenth and one sixth, depending on diameter and hardness: large, hard tablets can take more, small or brittle ones need less. The cutting angle governs how stress concentrates when the tablet is snapped. Too blunt and you get ragged edges and crumbs; too sharp and micro-cracks form at the base of the notch, which show up in friability testing. Whether to score both faces depends on thickness. Thin tablets need one side only; thick tablets rarely break neatly from a single score and are usually given aligned notches top and bottom. Notch width matters too - too wide gives a rough fracture surface, too narrow wears the punch quickly.
Core bonding is what actually decides a clean break
The notch only supplies the starting point of the crack; core bonding decides how the break travels. When bonding is weak, the crack leaves the notch line and takes a chunk off at an angle. The controlling factors are binder type and level, granule moisture, and lubricant level with mixing time. Too much magnesium stearate, or too long a mix, coats the granules in a hydrophobic film that directly weakens particle-to-particle bonding. Tablets like this break with a white, dusty surface even when the notch is cut perfectly. Conversely, granules that are too dry are less plastic, so the compressed tablet retains internal stress and may crack along the notch within days. The formula must be tuned for breakability during sampling, not revisited after the notches misbehave.
Hardness is not one number: axial versus radial
A hardness tester normally reads radial hardness, yet snapping loads the tablet along one face of that same diameter, and the loading direction is not identical. In any given formula, when axial hardness runs low, tablets are far more likely to laminate while being split. Three production levers help. First, keep main compression pressure inside a sensible window - too low means insufficient bonding, too high means greater elastic recovery and capping risk. Second, pay attention to pre-compression, which expels air from the powder bed; tablets with trapped air show obvious pits on the fracture surface. Third, control turret speed, because faster running shortens dwell time and reduces bonding. All three map to dials on the machine, not abstract concepts.
Tooling: the notch is worn away over time
The notch is cut into the working face of the punch, and punches wear. The usual pattern is that late in a tooling set's life the notch becomes shallower and its edges round over. The mark still looks present on the tablet, but breaking force has risen noticeably and customers assume the formula changed. Good practice is to keep a separate record for scoring punches: log cumulative tablet output, inspect notch depth and profile periodically with a loupe or profile projector, and refurbish or replace once wear exceeds limits. When a notch and an embossed logo share one punch, remember that embossing depth affects the notch - a deep engraved area fills less densely, and tablets chip near the lettering. Hardened tool steel is standard; high-volume products justify wear-resistant coated punches.
Verification: four measurable checks
Acceptance for scored tablets cannot rest on appearance. At least four checks are worth running. First, breaking force: use a simple fixture or push-pull gauge and characterise the range across a batch, looking for a tight spread. Second, half-tablet weight difference: split a random sample and weigh each half, which directly exposes an off-centre notch or uneven hardness. Third, friability by the standard method, watched specifically for tablets cracking along the score. Fourth, drop and transport simulation with the actual pack, checking the notch region for cracks. Establish baselines during sampling, sample each production batch against them, and investigate tooling and compression settings as soon as results drift.
Scored tablets are not a difficult product, but they push several easily ignored parts of tablet processing onto the table: tooling precision, bonding, hardness distribution and verification method. For a contract manufacturer, showing breaking-force and half-tablet weight data at sampling stage is far more persuasive than promising that it can be done. Buyers with a scored product should state the target breaking feel and the acceptable half-tablet weight spread up front; the factory can then work backwards to notch geometry and formulation, and the design usually locks in within two sample rounds.
Related Products
Glycerol diester coffee OEM OEM OEM OEM OEM meal replacement coffee MCT live broadcast same solid beverage source manufacturer | GLP-1 Semaglutide Satiety & Fat Blocker Tablets | Custom Pressed Candy OEM Manufacturing
About Guangzhou Mesen Health Biotechnology Co., Ltd
Guangzhou Mesen Health Biotechnology Co., Ltd is located in the Huashan Science and Technology Park, Huadu District, Guangzhou. The company has focused on OEM and ODM services for the big health industry for nearly 20 years, operating dedicated research, production, sales and management centres, and maintaining long-term strategic partnerships with well-known Chinese medicine colleges and research institutions. Capabilities span pressed candy, gummies, capsules, solid beverages, herbal teas, plant beverages, protein powders, dietary supplements and enzyme jelly - from formulation development through contract manufacturing. For details on minimum order quantities, sampling lead times and quotations, see our manufacturing advantages and product range, or contact us for a tailored proposal.
Further Reading
