Card warping detection method
By using technical means such as transmission belts and detection light sources during card preparation, the problem of difficulty in quantifying and detecting card warping is solved, and the quality monitoring and quantitative detection of card raw material composite sheets is realized, ensuring accurate control of card preparation quality.
Patent Information
- Application Number
- CN202411736701.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-03-11
AI Technical Summary
The prior art is difficult to quantify the detection of card warping problems, which makes it difficult to control the quality of card preparation.
The transmission belt is used to transmit the card raw material composite sheet, and a monitoring area is set up in different processes. The detection light source and projection area are used to cooperate with the detection camera to determine the warping state of the composite sheet through the reflection form, and the warpage of the sample card is measured by sampling and detection ruler.
The quality monitoring and quantitative detection of card raw material composite sheets is realized, ensuring accurate control of card preparation quality, and improving detection efficiency and accuracy.
Smart Images
Figure CN119594898A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of detection technology, and in particular to a card warping detection method. Background Art
[0002] Cards generally refer to flat sheets of cards that are printed and die-cut, including playing cards, game cards, hanging cards, etc. To evaluate card warping, the cards are generally placed on a flat surface. From the side, it can be observed that the cards are warped upward or downward. When multiple cards are neatly stacked, the warping directions are the same and the cards can still be sorted neatly (which also affects the player's feel and appearance). When the warping directions are messy, the sorted cards will be very irregular, which seriously affects the player's interest and mood. The industry generally attaches importance to qualitative analysis, and there is no suitable quantitative measurement or evaluation method.
[0003] Cards are generally produced from paperboard that is a composite of paper and plastic. Warping of paper composite materials is a common problem in the industry. Different application fields have different tolerances for warping. The raw paper for producing cards is rolled up in rolls, weighing up to one ton. After compounding, it is cut into flat sheets as the raw material for card printing, which is also close to one square meter. At this time, the warping is not obvious. The evaluation of card warping is generally to place the punched cards of uniform size on a plane and observe from the side whether the card is warped upward or downward. When the card is not punched into sheets, it is a large flat sheet and often has no warping or inconspicuous warping. When it is punched into half the size of a palm, it loses the influence of its own weight and shows warping.
[0004] Existing methods for evaluating curl angles of flat sheets or rolls of base paper, non-composite base paper, and thin papers with a basis weight between 60 and 150 g / m², such as writing paper, printing paper, and copy paper, are performed by draping them in extremely dry or extremely wet environments. These methods, as well as those for measuring cigarette packs on a flat surface, are not suitable for playing cards. A single card is placed on a flat surface and qualitatively identified by visual observation or by measuring the height of the warp and bow with a ruler. Due to the small surface area of a card, qualitative characterization of card warpage is easier than quantitative characterization. When measuring a card horizontally on a flat surface, the card must not be clamped or subjected to external force, as this will result in inaccurate measurements. Furthermore, both sides of the card are offset or UV printed, and are generally coated with a wear-resistant varnish, making their resistance to environmental humidity significantly different from that of base paper.
[0005] To this end, it is necessary to detect and quantify the warping problem that currently exists in the cards, and a corresponding method is needed to carry out this work. Summary of the Invention
[0006] The purpose of the present invention is to solve the problem that the warping of cards cannot be quantitatively detected, and to provide a card warping detection method.
[0007] Specifically, the present invention adopts the following technical solutions: A card warping detection method comprises the following steps: Step 1: During the card production process, a conveyor belt is used to transport the smooth surface of the card raw material composite sheet, and monitoring is performed on the conveyor belt in different processes. The specific monitoring method is as follows: First, a monitoring area is set up on the conveyor belt to monitor the composite sheet on the conveyor belt. Detection light sources are set up on the front and rear sides and / or left and right sides above the monitoring area. The detection light sources provide an emission light beam directed toward the monitoring area at a certain angle to the surface of the base paper. A projection area is set above the base paper after the emission light beam is reflected by the monitoring area. A detection camera is set in conjunction with the projection area to detect the reflection shape of the reflected light beam in the projection area. The warping state of the composite sheet is determined based on the reflection shape. Step 2, after step 1, or independently of step 1, sampling the composite sheet in different processes, wherein the sampling is carried out in a transverse and longitudinal manner; Step 3, sample card preparation, sample card preparation includes preparing horizontal sample cards and vertical sample cards; a standard sampler is provided for preparing sample cards; For horizontal sample cards, cut strips of preliminary samples along the full width of the composite sheet. The cutting line of the preliminary sample should be perpendicular to the edge of the composite sheet, that is, perpendicular to the running direction of the composite sheet. The preliminary sample must be kept flat, without folds or wrinkles. The width of the preliminary sample should be adapted to the sample sampler. Then use the sample sampler to cut 5-10 sample cards at even intervals. The sample cards should be rectangular with the long side along the direction of the preliminary sample. The corresponding sample card numbers should be marked on the cut sample cards in the order of cutting. Longitudinal sample card: cut strips of preliminary samples along the longitudinal direction of the composite sheet. The cutting line of the preliminary sample is parallel to the running direction of the sheet. Specifically, three strips are taken from the left, middle and right sides in the width direction. When the composite coil can identify the operating side, it should be marked with the operating side, middle and transmission side, or the operating side, middle and transmission side. The preliminary sample must be kept flat, without folds or wrinkles. The width of the preliminary sample is suitable for the sample sampler. Then, use the sample sampler to cut 5-10 sample cards from the three strips at even intervals. The sample cards are rectangular with the long side along the direction of the preliminary sample. The corresponding sample card numbers are marked on the cut sample cards in the order of cutting. Step 4: Testing: In each set of samples, two sample cards are drawn; First, stack the two pieces with their backs facing each other, then fix one section of the short side of the rectangle and use a measuring ruler to measure the opening value of the short side at the other end; Then, stack them up with their backs facing each other, fix one section of the long side of the rectangle, and use a measuring ruler to measure the opening value of the long side at the other end; Based on the tested data, the warpage of the sample card is quantitatively evaluated; Step 5: Record the results and determine the results Record the measured values of the long and short side warping of each group of sample cards, take the largest value as the warping value of the sample card, and compare it with the standard value. If the warping of the sample is less than or equal to the standard value, the sample is qualified, otherwise the sample is judged to be unqualified.
[0008] Furthermore, in step 1, the emitted light beam is a line beam with a width of 2-5 mm.
[0009] Furthermore, in step 1, the emission light beams on the same side are two beams with different incident angles directed to the same position of the composite sheet.
[0010] Furthermore, in step 1 or step 2, different processes include incoming inspection, retesting before use, process inspection, final inspection and finished product delivery; sampling comes from composite semi-finished product rolls and cut paper sheets.
[0011] Furthermore, the short side of the sample card is 5-10 cm.
[0012] Furthermore, the standard sampler includes a main body, which has a base, and a rectangular sampling platform is provided on the base. The sampling platform is correspondingly provided with a frame-shaped sample cutter, the inner frame of the sample cutter cooperates with the sampling platform and the inner frame has a cutout, the sample cutter is connected through a transmission rod provided in the base, and the bottom of the transmission rod is connected through a rocking arm provided on the base.
[0013] Compared with the prior art, the present invention has the following beneficial effects: It can timely monitor the quality of the raw composite sheets used to prepare cards. After detecting unqualified composite sheets, it can further determine the quantitative warping, thereby achieving precise control of the quality of card preparation and preventing the occurrence of unqualified card preparation due to warping of raw materials. This method has high detection efficiency and good accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of the standard sampler of the present invention.
[0015] Figure 2 It is a side view of the standard sampler of the present invention.
[0016] In the figure: 1 base, 2 sampling platform, 3 sample cutter, 4 transmission rod, 5 rocking arm. DETAILED DESCRIPTION
[0017] The representative embodiments shown in the accompanying drawings will now be further detailed. It should be understood that the following description is not intended to limit the embodiments to a preferred embodiment. Instead, it is intended to encompass alternatives, modifications, and equivalents that are within the spirit and scope of the embodiments defined by the appended claims.
[0018] Our company has developed a card warpage detection method that includes the following steps: Step 1: During the card production process, a conveyor belt is used to transport the smooth surface of the card raw material composite sheet, and monitoring is performed on the conveyor belt in different processes. The specific monitoring method is as follows: First, a monitoring area is set up on the conveyor belt to monitor the composite sheet on the conveyor belt. Detection light sources are set up on both sides of the monitoring area. The detection light source provides an emission light beam directed at the monitoring area at a certain angle to the surface of the base paper. The emission light beams on the same side use two beams with different incident angles directed at the same position on the composite sheet. The emission light beam is a linear beam with a width of 2-5mm. A projection area is set above the emission light beam after it is reflected by the base paper in the monitoring area. A detection camera is set in conjunction with the projection area to detect the reflection shape of the reflected light beam in the projection area. The warping state of the composite sheet is determined based on the reflection shape. Step 2, after step 1, or independently of step 1, sampling the composite sheet in different processes, wherein the sampling is carried out in a transverse and longitudinal manner; Step 3: Sample card preparation. Sample card preparation includes horizontal and vertical sample cards. A standard sampler is also provided for preparing sample cards. The short side of the sample card is 5-10 cm and the aspect ratio is 2-3:1. For horizontal sample cards, cut strips of preliminary samples along the full width of the composite sheet. The cutting line of the preliminary sample should be perpendicular to the edge of the composite sheet, that is, perpendicular to the running direction of the composite sheet. The preliminary sample must be kept flat, without folds or wrinkles. The width of the preliminary sample should be adapted to the sample sampler. Then use the sample sampler to cut 5-10 sample cards at even intervals. The sample cards should be rectangular with the long side along the direction of the preliminary sample. The corresponding sample card numbers should be marked on the cut sample cards in the order of cutting. Longitudinal sample card: cut strips of preliminary samples along the longitudinal direction of the composite sheet. The cutting line of the preliminary sample is parallel to the running direction of the sheet. Specifically, three strips are taken from the left, middle and right sides in the width direction. When the composite coil can identify the operating side, it should be marked with the operating side, middle and transmission side, or the operating side, middle and transmission side. The preliminary sample must be kept flat, without folds or wrinkles. The width of the preliminary sample is suitable for the sample sampler. Then, use the sample sampler to cut 5-10 sample cards from the three strips at even intervals. The sample cards are rectangular with the long side along the direction of the preliminary sample. The corresponding sample card numbers are marked on the cut sample cards in the order of cutting. Step 4: Testing: In each set of samples, two sample cards are drawn; First, stack the two pieces with their backs facing each other, then fix one section of the short side of the rectangle and use a measuring ruler to measure the opening value of the short side at the other end; Then, stack them up with their backs facing each other, fix one section of the long side of the rectangle, and use a measuring ruler to measure the opening value of the long side at the other end; Based on the tested data, the warpage of the sample card is quantitatively evaluated; Step 5: Record the results and determine the results Record the measured values of the long and short side warping of each group of sample cards, take the largest value as the warping value of the sample card, and compare it with the standard value. If the warping of the sample is less than or equal to the standard value, the sample is qualified, otherwise the sample is judged to be unqualified.
[0019] The above-mentioned testing method is applicable to different processes in the preparation of cards, including incoming inspection, retesting before use, in-process inspection, final inspection and finished product delivery; sampling comes from composite semi-finished rolls and cut paper sheets.
[0020] Among them, the standard sampler used above is as follows Figure 1 and Figure 2 The device comprises a main body having a base on which a rectangular sampling platform is mounted. A frame-shaped sample cutter is mounted corresponding to the sampling platform. The inner frame of the sample cutter cooperates with the sampling platform and has a cutout. The sample cutter is connected to the sampling platform via a transmission rod disposed within the base. The bottom of the transmission rod is connected to the base via a rocking arm disposed on the base.
[0021] The swing of the rocking arm drives the transmission rod up and down, thereby driving the sample cutter and the sampling table to move relative to each other, so that the sample card is prepared by utilizing the incision of the sample cutter.
[0022] It is obvious to those skilled in the art that certain modifications, combinations and variations can be made based on the above teachings.
Claims
1. A card warping detection method, characterized in that: The following steps are involved: Step 1: During the card preparation process, a conveyor belt is used to transport the composite sheet of card raw materials with a smooth surface, and monitoring is performed on the conveyor belt in different processes. The specific monitoring method is as follows: First, a monitoring area is set on the conveyor belt to monitor the composite sheet on the conveyor belt. A detection light source is set on the front and rear sides and / or the left and right sides above the monitoring area. The detection light source provides an emission light beam that is directed to the monitoring area and has a certain angle with the surface of the base paper. A projection area is set above the emission light beam after it is reflected by the base paper in the monitoring area. A detection camera is set in conjunction with the projection area to detect the reflection shape of the reflected light beam in the projection area; the warping state of the composite sheet is determined according to the reflection shape; Step 2, after step 1, or independently of step 1, sampling the composite sheet in different processes, wherein the sampling is carried out in a transverse and longitudinal manner; Step 3, sample card preparation, the sample card preparation includes preparing a horizontal sample card and a vertical sample card; and providing a standard sampler for preparing the sample card; For horizontal sample cards, cut strips of the initial sample along the full width of the composite sheet. The cutting line of the initial sample is perpendicular to the edge of the composite sheet, that is, perpendicular to the running direction of the composite sheet; the initial sample must be kept flat, without folds or wrinkles. The width of the initial sample is adapted to the sample sampler. Then use the sample sampler to cut 5-10 sample cards at uniform intervals. The sample card is rectangular with the long side along the direction of the initial sample. The corresponding sample card numbers are marked on the cut sample cards in the order of cutting; Longitudinal sample card, cut strips of the composite sheet along the longitudinal direction, and the cutting line of the sample is parallel to the running direction of the sheet. Specifically, three strips are taken from the left, middle and right in the width direction. When the composite coil can identify the operating side, the operating side, middle and transmission side, or the operating side, middle and transmission side should be marked; the sample should be kept flat, without folding or wrinkles. The width of the sample is suitable for the sample sampler, and then the sample sampler is used to cut 5-10 sample cards from the three strips at uniform intervals. The sample card is rectangular with the long side along the direction of the sample, and the corresponding sample card numbers are marked on the cut sample cards in the order of cutting; Step 4, testing, in each group of samples, two sample cards are drawn; First, stack the two pieces with their front and back sides facing each other, then fix one section of the short side of the rectangle and use a measuring ruler to measure the opening value of the short side at the other end; Then, stack them up with their front and back sides facing each other, and then fix one section of the long side of the two rectangles, and use a measuring ruler to measure the value of the opening of the long side at the other end; According to the tested data, the warpage of the sample card is quantitatively evaluated; Step 5: Record the results and determine the results Record the measured values of the long and short side warping of each group of sample cards, take the largest value as the warping value of the card of the sample, and compare it with the standard value. If the warping of the sample is less than or equal to the standard value, the sample is qualified, otherwise the sample is judged to be unqualified.
2. A card warping detection method according to claim 1, characterized in that: In step 1, the emitted light beam is a line beam with a width of 2-5 mm.
3. A card warping detection method according to claim 1, characterized in that: In step 1, the emission light beams on the same side are two beams with different incident angles directed to the same position of the composite sheet.
4. A card warping detection method according to claim 1, characterized in that: In step 1 or step 2, different processes include incoming inspection, retesting before use, process inspection, final inspection and finished product delivery; sampling comes from composite semi-finished product rolls and cut paper sheets.
5. A card warping detection method according to claim 1, characterized in that: The short side of the sample card is 5-10cm.
6. A card warping detection method according to claim 1, characterized in that: The standard sampler includes a body, which has a base, and a rectangular sampling platform is arranged on the base. A frame-shaped sample cutter is arranged corresponding to the sampling platform. The inner frame of the sample cutter cooperates with the sampling platform and has a cutout. The sample cutter is connected through a transmission rod arranged in the base, and the bottom of the transmission rod is transmission-connected through a rocking rod on the base arranged on the base.