What are the handicraft production methods of cardboard?

1. First, we cut 6-8 leaflike pieces of paper from soft paper.

2. Fold them in half and stick the edges together to make a balloon.

3. Stick the four connecting wires to the bottom of the balloon with adhesive tape. Fix the other end of the line on the table with plasticine.

Try to set the speed of the hair dryer very slowly. Aim the air outlet upward at the opening at the bottom, and then turn on the switch. The balloon will gradually get bigger, tighten the line and leave the table.

Homemade flashlight

The specific manufacturing method is: lift one end of an abandoned can (such as Lulu beverage can) and beat the other end with a round hammer. Roll up two 1 batteries with thick corrugated cardboard and put them in a can, with the positive pole facing up and the negative pole facing down. Find a suitable plastic cover (for example, the magic big roll cover can just be buckled on Lulu's beverage can), and dig a round hole in the center of the cover, the size of which is suitable for the light bulb to be inserted tightly. Insert the bulb base into the small hole. Take a section of tracing wire, peel off the wire skin at both ends, wrap one end around the lamp cap, and tie a small hole at the other end from the side of the plastic cover. Put the plastic cover on the jar. Check whether the bulb and battery are in close contact. Disposable flashlights will be ready here. When in use, press the wire on the side wall with your thumb on the unpainted weld of the can, and the flashlight will glow. When the thumb jumps off the wire, the flashlight will go out, which is very convenient to use.

Self-made solar cooker

Find a concave reflective bowl on a big flashlight, and cut it into a cylinder about 4 cm long with rigid foam plastic or wood, just enough in diameter to fit into the round hole of the reflective bowl. Drill a fine hole horizontally at one end of the cylinder, insert an iron wire with a diameter equivalent to the aperture, and then bend the two ends of the iron wire exposed outside the cylinder at 90 degrees, leaving 5 cm each. Insert the cylinder into the round hole of the reflective bowl, and then insert both ends of the iron wire on the foam plastic or wooden bottom plate. Sharpen both ends of a thin bamboo stick, insert one end into the cylinder in the center of the reflective bowl, and insert a small piece of potato at the other end. Put the device in the sun, let the reflective bowl face the sun, and then, patiently adjust the length of the bamboo stick so that the inserted potatoes are just in the focus of light. It won't be long before the potatoes are cooked by the sun and smell delicious.

Self-made cockroach catching box

Take a piece of 220× 150(mm) cardboard.

The most important part of the capture box is the capture surface. Take a piece of plastic film, cut it into the same size as the bottom of the box, coat it with adhesive and spread it on the bottom of the box. Whether you can catch cockroaches depends on the adhesive. The adhesive has two functions: one is to introduce the cockroach into the box, and the other is to firmly stick the cockroach to the catching surface. Preparation of attractant: Mix 40% meat powder, 50% flour and 10% bean cake, with a total amount of about 20g, and mix well for later use. Mix 20g of rosin with10g of vegetable oil, heat to gel, and mix attractant and adhesive evenly.

Spread the prepared paste evenly on the scratch surface lined with plastic film, fold it inward according to the original dotted line, and finally insert the tongue piece B into the notch A.

Because the mixture of rosin and vegetable oil is not dry, the viscosity of bait can be as long as one week. Put the trap box in the place where cockroaches haunt. Because the box is dark and has the bait that cockroaches like, cockroaches will climb into the box to fight for the bait and get stuck on it. When it is full, the carton can be crushed and discarded, and the plastic film can be removed and replaced with plastic film coated with bait, so that the box can be reused.

If the size of the catching box is enlarged and the composition of the adhesive is slightly adjusted, the paper mousetrap can be made by thickening the coating.

Electronic small balance model, note that this is a model, which can only weigh very light objects, such as two small pieces of paper.

Material: a wooden board (preferably thinner, not too big), a washer, a paper clip, an awl, an electric soldering iron, several wires, two light-emitting diodes and a battery. These materials are easy to find. If there is no led, you can go to the electronic market to buy it. They are very cheap.

Technology: drill a small hole in the middle of the board with an awl, bend a paper clip into a hook shape, and fix it on the board through the small hole perpendicular to the board, just hang the washer on the hook. Then take two paper clips and straighten them in half, leaving only one corner. In fact, the straight part is the arm of the balance, and the remaining curved part is the tray. Another paper clip does the same thing. Then use the middle washer to weld the two paper clips together, and the paper clips should be in a straight line. Then hang the washer on the hook, adjust the distance between the hook and the board, about 3 mm, then fix two paper clips under the two trays, and prepare led as the indicator light next to the paper clips. A circuit is arranged under the board, and the balance is equivalent to a single-pole double-throw switch. This circuit is equivalent to two loops, using a power supply and two light emitting diodes. As long as the left side sinks, the tray on the left side will be connected with the pin below him, so that the circuit will be connected and the diode will emit light; If the two sides are equal in weight, the circuit is blocked and both diodes are not lit.