Woodworking glue, in a narrow sense, refers to adhesives used in the woodworking industry. In a broad sense, the industries in which wood glue can be applied are very extensive and not limited to the woodworking industry. Adhesives are indispensable in the carpentry industry. It is not an exaggeration to say that as long as they are used properly, they can be turned into rots and become magical. They can be useful for turning waste materials, and they can be used for small materials, superior materials, and talents. The following small series introduces the types of wood glue and the use of wood glue.
Types of woodworking glue
1, outdoor woodworking glue
Outdoor wood glue is industrial-grade white latex. When it is dry, it can be cleaned with water, translucent, sandable, nontoxic, paintable and waterproof. Can bond MDF board. Heat resistance up to 110 °C, specifically for woodworking or manufacturing plant bonding various types of wood products. Suitable for bonding all kinds of soft and hard wood, MDF medium density fiberboard, fire board, broken wood and other materials and a variety of indoor maternity furniture, wood ... bonding work.
2, polyurethane woodworking glue
Polyurethane wood glue is an advanced woodworking adhesive. It is brown, light yellow after drying, and swells, so it is also advisable to bond/fill in small cracks. Non-toxic, anti-stress, acid and alkali resistance (woodworking gel will reduce the adhesive force). After drying it can be polished, dyed, painted, and heat-resistant up to 140°C. It is advisable to bond indoor and outdoor wood, glass, MDF board, metal, cement, porcelain, most plastic products, and to bond wood to almost all materials.
3, woodworking glue
Woodworking glue is specially used for bonding all kinds of interior wood products and furniture. It is milky white, can be cleaned with water when it is dry, and transparent after drying. Non-toxic, non-polluting wood. It can bond various rough wood, cloth, paper, leather and other materials (it can not bond MDF board). Wooden handmade products for bonding, or repairing furniture, wooden photo frames, various wooden stools, wooden wine racks, wooden cabinets and broken wood.
How to use wood glue
1, temperature
In different seasons, the working environment temperature and the surface temperature of the wood must be measured in time. The level of temperature, to some extent, determines the speed of cross-linking puzzle glue reflects the speed. The surface temperature of the wood is closely related to the duration of the panel holding pressure. Glue at different temperatures, the use of time is different: in the summer, the mixed puzzle can be used for 30 minutes (that is, the sooner it is used as possible); in the winter, the mixed puzzle The glue can be used for 60 minutes.
2, mixed rubber
The main agent and curing agent should be mixed strictly according to the weight ratio of 100:15, and should be fully stirred and averaged. The mixed puzzle glue should be used within the manipulable time. Do not mix wood chips, dust, etc., or add water when mixing the glue. It is forbidden to mix the main agent and curing agent before use. After taking the glue, you should pay attention to the seal retention.
3, wood moisture content
After drying, the moisture content of the dried wood should be controlled within 7-12%. When the wood moisture content is less than 7%, it may cause the phenomenon that the wood seepage and exudation are too strong and cause the adhesive surface to lack of glue to cause cracking. If the wood moisture content is too high, it will directly lead to poor infiltration and exudation, and it will be difficult to form plastic nails. Cross-linking will not be fully reflected, and it may cause the phenomenon of open glue. The critical moisture content of wood should be controlled within 3%.
4, wood processing accuracy
The accuracy of wood processing should be within 0.15mm. There should be no processing defects such as “tapping and finishing†on the surface of wood bonding. The straight angle of the wood is good. Wood adhesive surface should be no "planing marks, saw marks, charring" and other phenomena. It is forbidden to use the wood whose adhesive surface has been contaminated with grease, dust, etc. for bonding.
Woodworking glue opening reason
1, the moisture content of the bonding substrate
White latex is a water-soluble adhesive, the principle of adhesion is also absorbed by the wood fiber after the colloid to melt into one, if the moisture content of the bonding material is greater than 12%, leading to the adhesive surface to reduce the bonding effect.
2, the adhesion of the substrate flatness
The flatness of the bonding substrate is the premise of bonding, and the flatness error of the wood is required to be controlled within 0.1 mm. The protrusions on the local edges also cause the other adhesive surfaces to be unable to be bonded due to their inability to adhere tightly.
3, the amount of glue is scientific
Excessive amount of glue may cause problems such as excessive adhesion of the residual colloids, resulting in poor adhesion, or even deformation and mildew of the board. When the amount of glue is too small, the amount of effective colloid absorbed by the bonding surface will not be sufficient. Phenomenon, the scientific standard for the amount of glue is generally 250-300g/m2, and the naked eye should see the even granular rubber particles extruded between the two pressed surfaces.
4, whether the standard pressure
The pressure of the press is not uniform or the pressure is not in place. It is also the main reason for opening the rubber. The simplest but most standard method for checking the pressure balance of the press is: use four A4 sheets on the four corners of the press and press the press. All in the end, to see if four A4 papers can be taken out, the most standard press is unable to extract A4 paper from any corner.
5. The glue that has been painted on the adhesive surface before pressing is dry
Workers use the same press to batch-press plates at the time of construction. The first plate is coated with glue until the last plate is coated and the press is set down. This time period may last for more than half an hour and more than half an hour. The time is enough for the colloids on the glued sheet to be cured under the following (first glued sheet), that is, when the press is down, the colloid on the lower press sheet has solidified, equal to no added Pressure, the phenomenon of dryness before compression is most common in summer. Since the glue opening phenomenon that occurs before pressurization opens two adhesive surfaces, there is usually a phenomenon that one side of the adhesive has no glue on the other side, and when the surface is not severe, the open side of the plastic surface on the surface of the board will appear. It is "meshed" state.
6, the use of glue is low
The degree of softness and hardness of the bonded wood directly determines the quality of the glue used. The harder the wood, the higher the quality of the glue. If the wood is hard but the content of the glue is not enough, the bonding effect cannot be guaranteed.
Editor's summary: The types of woodworking glue and the use of woodworking glue are introduced here. We hope to help everyone. If you want to know more about yourself, you can follow the information on this site.
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