Molding process and classification
Molding process is mainly divided into: die cutting version, design drawing, cutting wood block to install knife, line to paste sponge, proofing, lifting drum line, die cutting and other operations.
At present, the domestic corrugated box forming methods are mainly die-cutting and slotting two, including die cutting including flat die cutting, round die cutting and circular die cutting three kinds. In terms of accuracy, several types of molding from high to low are arranged as follows: flat die cutting, round die cutting, round die cutting, slotting. From the processing speed, from the high to the low order for: slotting, round die-cutting, flat die cutting, flat die cutting. Each carton has a different use requirements, in the choice of corrugated box molding method, should be based on different carton product categories and requirements, choose the right way of forming.
Round die cutting
Rotary molding process using curved board, drum knife version of production, production, molding roller continuous rotation, high production efficiency, product die-cutting precision can be controlled within 1mm, and has the advantages of simple operation, safe and reliable equipment and equipment used for a long time, but the overall cost of large investment.
Because it is in the die rolling at the same time, the corrugated cardboard die cutting molding, the die-cutting knife strength requirements are higher, knife mold production difficulty and cost, suitable for large batch production processing. It is divided into two kinds of hard cutting method and soft cutting method. The main difference is the material of press cutting roller, one is hard steel roller, and another is soft plastic. Hard cut method refers to the die - cutting knife at the time and pressure roller surface of rigid contact, and die-cutting knife more easily wear, bending. The soft cut is covered with a layer of engineering plastics, the surface pressure of cutting platen die-cutting, the cutter can cut a certain quantity, which can protect the cutter, and can guarantee completely cut off, but need regular replacement of plastic layer, otherwise it will lead to inconsistent cutting line speed because the size is not accurate.
Round die cutting machine has entered our country for more than 20 years, and its die cutting precision, as the machine manufacturing accuracy and supporting materials progress, has reached most of the carton users can accept the degree. At present, more and more manufacturers have adopted this method of processing. But in the process there have been some such as "inaccurate" indentation "cutting edge" fluff "burst line", the influence of rotary die-cutting machine use effect. In this paper, some problems that affect the pressing accuracy are analyzed.
Manufacture of roller die
High quality die cutting process and die-cutting, cutting, indentation, steel wire and other related die-cutting materials and knife mold production has a close relationship.
This requires not only a good blade and sponge, but also the quality of the arc board, shape and die cutting version of the production has a high demand.
Design and drafting
Making die first to really clear the user's requirements, box type design such as cutting, indentation, require the use of pressure, gas and transportation, according to the characteristics of packaging products and packaging weight, to determine the size and design of box type die layout and constantly revised. In the design of box type, as far as possible the use of "international carton rules" identified in the seven types of cartons.
After the type of carton is determined, when drawing the die cutting layout, it should be drawn according to the carton, carton design, drawing method and dimensioning method stipulated in the GB12986 - 91 carton drawing standard. We must ensure that the size is accurate, standardized, uniform specifications drawings, clear and neat handwriting, graphics for drawing the structure selection and manufacture according to the special requirements to draw three-dimensional map to illustrate. Drawing die cutting layout is the first critical link in the die cutting version. The design of the drawing machine is more accurate, and it can effectively guarantee the size of the die cutting plate.
Stencil making
First, the choice of good quality die-cutting plate, its hard texture, easy to deformation, strong pressure resistance, the surface shall be subject to the waterproof barrier treatment, and the use of environmentally friendly adhesive glue, polishing, no crack, no side up, with high precision thickness tolerances and surface curvature. Die-cutting thickness is generally 12 ~ 18mm, die-cutting single corrugated paper can be used thicker, double corrugated can choose thinner.
Die cutting way mainly has two kinds of saw cutting and laser cutting, cutting saw is the main method of small and medium-sized enterprises themselves, corrugated carton processing die in recent years, laser cutting is widely used in laser cutting, the computer controlled machine, using laser as a source of energy, high cutting precision. Either way, the cutting line is required to be straight, and the width of the cutting slot is equal to the thickness of the knife and line installed here. In order to ensure that the die version is not loose version, do not release and fall off, it is necessary to set aside a number of "cross the bridge" in the appropriate place, the length of the bridge is determined according to the size of the page, the general length is 10mm.
To cut a good knife, knife line position will advance and steel wire cutting into the corresponding bending length and shape inlay groove cutting. After making and die-cutting the product size error should be less than 0.5mm.
The production of die according to the design personnel to provide cutting layout, knives and steel wire inserted into the template, to complete the process of die making. Knife, line set good, sponge with elastic steel in paste on both sides of the sponge cutting blade on both sides should leave at least 1mm distance, not close to the blade installation, otherwise the sponge in compression can not expand to the direction, and to both sides pull paper crack. The sponge should be slightly higher than the blade 1.2mm. Should be based on different die-cutting speed and product selection of different hardness, size and shape and sponge strip.
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