How to calculate the external dimensions of the packaging box

The drop specification of the carton is calculated. Here the net material specification of the carton is calculated, according to the formula. The edges will also be trimmed during production. In order to save as much material as possible, the general trimming size will not be larger than 1cm near the tongue of the edge does not need to be trimmed. Shaped box drop size according to the same principle can be calculated, just different box type calculation formula is not the same.
The size of the packaging box design starts from determining the nature of the product and box type. First determine the box type in order to design and calculate the size of each part.
First of all, we should consider the maximum outside diameter of the goods inside, the nature and the tolerance coefficient of shrinkage and expansion of the goods themselves, before determining the structural dimensions of the box. As well as the inside of the goods is the whole or combination set. At the same time, also consider the various accessories added for the protection of the inner goods, etc. This requires the design arrangement and structural layout to consider a variety of factors on the impact of the packaging box structure size.
I) size regulations
And according to the following order and code to give the size, the specification of the carton generally with the inner diameter of the carton size length, width, height expressed. Unit mma. length (L box in the bottom area of the long side of the size; b. width (B box in the bottom area of the short side of the size; c. height (H box in the top surface to the bottom surface size.
Available actual manufacturing size plus the thickness of the packaging board used packaging box size design content including the inner diameter size, manufacturing size and outer diameter size of the design. Inside diameter size for the box into the box after the internal space size; outside diameter size for the box into the box after the external profile size.
Available inside diameter size plus the thickness of the packaging board used for manufacturing dimensions. Degree expressed; manufacturing dimensions for the packaging box in the manufacturing process used in the size.
(B) the size of the design calculation
1 inside and outside diameter and manufacturing dimensions of the calculation
Inside diameter size of the factors to determine the maximum outside diameter of the contents of the size, the tolerance coefficient determined by the form of the contents, the arrangement of the contents, the contents of the liner and buffer related dimensions. The calculation of the inner diameter size can be obtained from the following formula Xi=Xmaxnx+dnx-1+k+T
Xi is the inner diameter size of the carton; Xmax is the maximum outer diameter size of a single insert; d is the number of the arrangement of the insert in a certain direction in the carton; k is the compensation amount of the inner diameter size of the carton; T is the total thickness of the spacer or cushion. Length units are mm need to meet Xi> the outer diameter of the goods inside the size. Correction factor and tolerance coefficient can look up the table to get the calculation of manufacturing dimensions as: X = Xi + t + formula. k
is the packaging board manufacturing dimensions, Eq. is the thickness of the cardboard, is the correction factor. The size of the value is related to the specific size of the carton. In actual use, due to the rebound effect of the inner rocking cover, it has the tendency to buckle outward. To reduce the increase in headroom height due to this cause, the value in the height direction should be 2t
X0 is the outside diameter size, X0 = X + K formula. K is the correction factor.
2 Calculation of carton swing cover size
As 020102040207, etc., the manufacturing size of the outer shaking cover of the packaging box is also a key part that needs attention. Packaging box outside the shaking cover butt sealing box type. Rocking cover width manufacturing size theoretical value should be one half of the box width manufacturing size. But due to the rebound effect of the inner rocking cover, the box lid closed is not horizontal but slightly tilted, the outer rocking cover is bound to produce a certain gap in the docking. Therefore, the width of the outer lid is not half of the width, but slightly longer, so in the actual production to add a magnification factor. The amplification factor can be calculated by trigonometric function. However, due to the plasticity of the carton itself and for ease of calculation, most companies calculate a fixed amplification factor based on the thickness of the cardboard.
Such a magnification factor is only suitable for general packaging boxes, carton shaking lid magnification factor cardboard thickness below 3mm 3mm~5mm5mm~8mm8mm~12mm magnification factor no Increase 1mm increase 3mm increase 4mm of course. If you encounter a carton with high requirements for the shaking cover, you can find out the amplification factor of the carton shaking cover by function. In addition, the enlargement factor listed in the table above is not suitable for cartons with width less than 20cm.
2 carton shaking cover size calculation of the manufacturing size of the outer shaking cover of the packaging box is also a key part that needs attention.
Such as 020102040207, etc., packaging boxes outside the rocking cover butt sealing in the box type. Rocking cover width manufacturing size theoretical value should be one half of the box width manufacturing size. But due to the rebound effect of the inner rocking cover, the box lid closed is not horizontal but slightly inclined, the outer rocking cover is bound to produce a certain gap in the butt. Therefore, the width of the outer lid is not half of the width, but slightly longer, so in the actual production to add a magnification factor. The amplification factor can be calculated by trigonometric function. However, due to the plasticity of the carton itself and for ease of calculation, most companies calculate a fixed amplification factor based on the thickness of the cardboard. The amplification factor of carton shaking cover cardboard thickness below 3mm 3mm~5mm 5mm~8mm 8mm8mm~12mm amplification factor without increase 1mm increase 3mm increase 4mm Of course, such amplification factor is only suitable for general packaging boxes, if encounter the high requirements of the shaking cover of the carton, you can find out the amplification factor of carton shaking cover by function. In addition, the enlargement factor listed in the table above is not suitable for cartons with width less than 20cm.
3 Design of joint size
The size of the joint scale is generally determined by the number of corrugated layers and the level of craftsmanship in the factory. In order to keep the printing surface of the main box surface (LH surface) from being damaged, the packaging box is shaped by gluing and nailing the joints. The joint should generally be connected to the LH side. The size of single corrugated joint is generally 35mm40mm double corrugated 45mm50mm triple corrugated for 50mm 4. Calculation of carton drop specifications
The figure below shows. According to what has been said above, the cartons produced now are still mainly 0201 type packing boxes. You can calculate how much material it takes to put an ordinary 0201-type carton into production 0201-type carton structure and unfolding diagram Length of cardboard = 2L + 2B + carton tongue; width of cardboard = H + 2 times the carton shake cover.